View.java revision 8f1344f5e7c92f2fd532f65e5584afe0e4cc6b11
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import com.android.internal.R; 20import com.android.internal.view.menu.MenuBuilder; 21 22import android.content.Context; 23import android.content.res.Resources; 24import android.content.res.TypedArray; 25import android.graphics.Bitmap; 26import android.graphics.Canvas; 27import android.graphics.LinearGradient; 28import android.graphics.Matrix; 29import android.graphics.Paint; 30import android.graphics.PixelFormat; 31import android.graphics.Point; 32import android.graphics.PorterDuff; 33import android.graphics.PorterDuffXfermode; 34import android.graphics.Rect; 35import android.graphics.Region; 36import android.graphics.Shader; 37import android.graphics.drawable.ColorDrawable; 38import android.graphics.drawable.Drawable; 39import android.os.Handler; 40import android.os.IBinder; 41import android.os.Message; 42import android.os.Parcel; 43import android.os.Parcelable; 44import android.os.RemoteException; 45import android.os.SystemClock; 46import android.os.SystemProperties; 47import android.util.AttributeSet; 48import android.util.Config; 49import android.util.EventLog; 50import android.util.Log; 51import android.util.Pool; 52import android.util.Poolable; 53import android.util.PoolableManager; 54import android.util.Pools; 55import android.util.SparseArray; 56import android.view.ContextMenu.ContextMenuInfo; 57import android.view.accessibility.AccessibilityEvent; 58import android.view.accessibility.AccessibilityEventSource; 59import android.view.accessibility.AccessibilityManager; 60import android.view.animation.Animation; 61import android.view.inputmethod.EditorInfo; 62import android.view.inputmethod.InputConnection; 63import android.view.inputmethod.InputMethodManager; 64import android.widget.ScrollBarDrawable; 65 66import java.lang.ref.SoftReference; 67import java.lang.reflect.InvocationTargetException; 68import java.lang.reflect.Method; 69import java.util.ArrayList; 70import java.util.Arrays; 71import java.util.WeakHashMap; 72 73/** 74 * <p> 75 * This class represents the basic building block for user interface components. A View 76 * occupies a rectangular area on the screen and is responsible for drawing and 77 * event handling. View is the base class for <em>widgets</em>, which are 78 * used to create interactive UI components (buttons, text fields, etc.). The 79 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 80 * are invisible containers that hold other Views (or other ViewGroups) and define 81 * their layout properties. 82 * </p> 83 * 84 * <div class="special"> 85 * <p>For an introduction to using this class to develop your 86 * application's user interface, read the Developer Guide documentation on 87 * <strong><a href="{@docRoot}guide/topics/ui/index.html">User Interface</a></strong>. Special topics 88 * include: 89 * <br/><a href="{@docRoot}guide/topics/ui/declaring-layout.html">Declaring Layout</a> 90 * <br/><a href="{@docRoot}guide/topics/ui/menus.html">Creating Menus</a> 91 * <br/><a href="{@docRoot}guide/topics/ui/layout-objects.html">Common Layout Objects</a> 92 * <br/><a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a> 93 * <br/><a href="{@docRoot}guide/topics/ui/ui-events.html">Handling UI Events</a> 94 * <br/><a href="{@docRoot}guide/topics/ui/themes.html">Applying Styles and Themes</a> 95 * <br/><a href="{@docRoot}guide/topics/ui/custom-components.html">Building Custom Components</a> 96 * <br/><a href="{@docRoot}guide/topics/ui/how-android-draws.html">How Android Draws Views</a>. 97 * </p> 98 * </div> 99 * 100 * <a name="Using"></a> 101 * <h3>Using Views</h3> 102 * <p> 103 * All of the views in a window are arranged in a single tree. You can add views 104 * either from code or by specifying a tree of views in one or more XML layout 105 * files. There are many specialized subclasses of views that act as controls or 106 * are capable of displaying text, images, or other content. 107 * </p> 108 * <p> 109 * Once you have created a tree of views, there are typically a few types of 110 * common operations you may wish to perform: 111 * <ul> 112 * <li><strong>Set properties:</strong> for example setting the text of a 113 * {@link android.widget.TextView}. The available properties and the methods 114 * that set them will vary among the different subclasses of views. Note that 115 * properties that are known at build time can be set in the XML layout 116 * files.</li> 117 * <li><strong>Set focus:</strong> The framework will handled moving focus in 118 * response to user input. To force focus to a specific view, call 119 * {@link #requestFocus}.</li> 120 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 121 * that will be notified when something interesting happens to the view. For 122 * example, all views will let you set a listener to be notified when the view 123 * gains or loses focus. You can register such a listener using 124 * {@link #setOnFocusChangeListener}. Other view subclasses offer more 125 * specialized listeners. For example, a Button exposes a listener to notify 126 * clients when the button is clicked.</li> 127 * <li><strong>Set visibility:</strong> You can hide or show views using 128 * {@link #setVisibility}.</li> 129 * </ul> 130 * </p> 131 * <p><em> 132 * Note: The Android framework is responsible for measuring, laying out and 133 * drawing views. You should not call methods that perform these actions on 134 * views yourself unless you are actually implementing a 135 * {@link android.view.ViewGroup}. 136 * </em></p> 137 * 138 * <a name="Lifecycle"></a> 139 * <h3>Implementing a Custom View</h3> 140 * 141 * <p> 142 * To implement a custom view, you will usually begin by providing overrides for 143 * some of the standard methods that the framework calls on all views. You do 144 * not need to override all of these methods. In fact, you can start by just 145 * overriding {@link #onDraw(android.graphics.Canvas)}. 146 * <table border="2" width="85%" align="center" cellpadding="5"> 147 * <thead> 148 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 149 * </thead> 150 * 151 * <tbody> 152 * <tr> 153 * <td rowspan="2">Creation</td> 154 * <td>Constructors</td> 155 * <td>There is a form of the constructor that are called when the view 156 * is created from code and a form that is called when the view is 157 * inflated from a layout file. The second form should parse and apply 158 * any attributes defined in the layout file. 159 * </td> 160 * </tr> 161 * <tr> 162 * <td><code>{@link #onFinishInflate()}</code></td> 163 * <td>Called after a view and all of its children has been inflated 164 * from XML.</td> 165 * </tr> 166 * 167 * <tr> 168 * <td rowspan="3">Layout</td> 169 * <td><code>{@link #onMeasure}</code></td> 170 * <td>Called to determine the size requirements for this view and all 171 * of its children. 172 * </td> 173 * </tr> 174 * <tr> 175 * <td><code>{@link #onLayout}</code></td> 176 * <td>Called when this view should assign a size and position to all 177 * of its children. 178 * </td> 179 * </tr> 180 * <tr> 181 * <td><code>{@link #onSizeChanged}</code></td> 182 * <td>Called when the size of this view has changed. 183 * </td> 184 * </tr> 185 * 186 * <tr> 187 * <td>Drawing</td> 188 * <td><code>{@link #onDraw}</code></td> 189 * <td>Called when the view should render its content. 190 * </td> 191 * </tr> 192 * 193 * <tr> 194 * <td rowspan="4">Event processing</td> 195 * <td><code>{@link #onKeyDown}</code></td> 196 * <td>Called when a new key event occurs. 197 * </td> 198 * </tr> 199 * <tr> 200 * <td><code>{@link #onKeyUp}</code></td> 201 * <td>Called when a key up event occurs. 202 * </td> 203 * </tr> 204 * <tr> 205 * <td><code>{@link #onTrackballEvent}</code></td> 206 * <td>Called when a trackball motion event occurs. 207 * </td> 208 * </tr> 209 * <tr> 210 * <td><code>{@link #onTouchEvent}</code></td> 211 * <td>Called when a touch screen motion event occurs. 212 * </td> 213 * </tr> 214 * 215 * <tr> 216 * <td rowspan="2">Focus</td> 217 * <td><code>{@link #onFocusChanged}</code></td> 218 * <td>Called when the view gains or loses focus. 219 * </td> 220 * </tr> 221 * 222 * <tr> 223 * <td><code>{@link #onWindowFocusChanged}</code></td> 224 * <td>Called when the window containing the view gains or loses focus. 225 * </td> 226 * </tr> 227 * 228 * <tr> 229 * <td rowspan="3">Attaching</td> 230 * <td><code>{@link #onAttachedToWindow()}</code></td> 231 * <td>Called when the view is attached to a window. 232 * </td> 233 * </tr> 234 * 235 * <tr> 236 * <td><code>{@link #onDetachedFromWindow}</code></td> 237 * <td>Called when the view is detached from its window. 238 * </td> 239 * </tr> 240 * 241 * <tr> 242 * <td><code>{@link #onWindowVisibilityChanged}</code></td> 243 * <td>Called when the visibility of the window containing the view 244 * has changed. 245 * </td> 246 * </tr> 247 * </tbody> 248 * 249 * </table> 250 * </p> 251 * 252 * <a name="IDs"></a> 253 * <h3>IDs</h3> 254 * Views may have an integer id associated with them. These ids are typically 255 * assigned in the layout XML files, and are used to find specific views within 256 * the view tree. A common pattern is to: 257 * <ul> 258 * <li>Define a Button in the layout file and assign it a unique ID. 259 * <pre> 260 * <Button id="@+id/my_button" 261 * android:layout_width="wrap_content" 262 * android:layout_height="wrap_content" 263 * android:text="@string/my_button_text"/> 264 * </pre></li> 265 * <li>From the onCreate method of an Activity, find the Button 266 * <pre class="prettyprint"> 267 * Button myButton = (Button) findViewById(R.id.my_button); 268 * </pre></li> 269 * </ul> 270 * <p> 271 * View IDs need not be unique throughout the tree, but it is good practice to 272 * ensure that they are at least unique within the part of the tree you are 273 * searching. 274 * </p> 275 * 276 * <a name="Position"></a> 277 * <h3>Position</h3> 278 * <p> 279 * The geometry of a view is that of a rectangle. A view has a location, 280 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 281 * two dimensions, expressed as a width and a height. The unit for location 282 * and dimensions is the pixel. 283 * </p> 284 * 285 * <p> 286 * It is possible to retrieve the location of a view by invoking the methods 287 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 288 * coordinate of the rectangle representing the view. The latter returns the 289 * top, or Y, coordinate of the rectangle representing the view. These methods 290 * both return the location of the view relative to its parent. For instance, 291 * when getLeft() returns 20, that means the view is located 20 pixels to the 292 * right of the left edge of its direct parent. 293 * </p> 294 * 295 * <p> 296 * In addition, several convenience methods are offered to avoid unnecessary 297 * computations, namely {@link #getRight()} and {@link #getBottom()}. 298 * These methods return the coordinates of the right and bottom edges of the 299 * rectangle representing the view. For instance, calling {@link #getRight()} 300 * is similar to the following computation: <code>getLeft() + getWidth()</code> 301 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 302 * </p> 303 * 304 * <a name="SizePaddingMargins"></a> 305 * <h3>Size, padding and margins</h3> 306 * <p> 307 * The size of a view is expressed with a width and a height. A view actually 308 * possess two pairs of width and height values. 309 * </p> 310 * 311 * <p> 312 * The first pair is known as <em>measured width</em> and 313 * <em>measured height</em>. These dimensions define how big a view wants to be 314 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 315 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 316 * and {@link #getMeasuredHeight()}. 317 * </p> 318 * 319 * <p> 320 * The second pair is simply known as <em>width</em> and <em>height</em>, or 321 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 322 * dimensions define the actual size of the view on screen, at drawing time and 323 * after layout. These values may, but do not have to, be different from the 324 * measured width and height. The width and height can be obtained by calling 325 * {@link #getWidth()} and {@link #getHeight()}. 326 * </p> 327 * 328 * <p> 329 * To measure its dimensions, a view takes into account its padding. The padding 330 * is expressed in pixels for the left, top, right and bottom parts of the view. 331 * Padding can be used to offset the content of the view by a specific amount of 332 * pixels. For instance, a left padding of 2 will push the view's content by 333 * 2 pixels to the right of the left edge. Padding can be set using the 334 * {@link #setPadding(int, int, int, int)} method and queried by calling 335 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 336 * {@link #getPaddingRight()} and {@link #getPaddingBottom()}. 337 * </p> 338 * 339 * <p> 340 * Even though a view can define a padding, it does not provide any support for 341 * margins. However, view groups provide such a support. Refer to 342 * {@link android.view.ViewGroup} and 343 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 344 * </p> 345 * 346 * <a name="Layout"></a> 347 * <h3>Layout</h3> 348 * <p> 349 * Layout is a two pass process: a measure pass and a layout pass. The measuring 350 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 351 * of the view tree. Each view pushes dimension specifications down the tree 352 * during the recursion. At the end of the measure pass, every view has stored 353 * its measurements. The second pass happens in 354 * {@link #layout(int,int,int,int)} and is also top-down. During 355 * this pass each parent is responsible for positioning all of its children 356 * using the sizes computed in the measure pass. 357 * </p> 358 * 359 * <p> 360 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 361 * {@link #getMeasuredHeight()} values must be set, along with those for all of 362 * that view's descendants. A view's measured width and measured height values 363 * must respect the constraints imposed by the view's parents. This guarantees 364 * that at the end of the measure pass, all parents accept all of their 365 * children's measurements. A parent view may call measure() more than once on 366 * its children. For example, the parent may measure each child once with 367 * unspecified dimensions to find out how big they want to be, then call 368 * measure() on them again with actual numbers if the sum of all the children's 369 * unconstrained sizes is too big or too small. 370 * </p> 371 * 372 * <p> 373 * The measure pass uses two classes to communicate dimensions. The 374 * {@link MeasureSpec} class is used by views to tell their parents how they 375 * want to be measured and positioned. The base LayoutParams class just 376 * describes how big the view wants to be for both width and height. For each 377 * dimension, it can specify one of: 378 * <ul> 379 * <li> an exact number 380 * <li>FILL_PARENT, which means the view wants to be as big as its parent 381 * (minus padding) 382 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 383 * enclose its content (plus padding). 384 * </ul> 385 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 386 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 387 * an X and Y value. 388 * </p> 389 * 390 * <p> 391 * MeasureSpecs are used to push requirements down the tree from parent to 392 * child. A MeasureSpec can be in one of three modes: 393 * <ul> 394 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 395 * of a child view. For example, a LinearLayout may call measure() on its child 396 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 397 * tall the child view wants to be given a width of 240 pixels. 398 * <li>EXACTLY: This is used by the parent to impose an exact size on the 399 * child. The child must use this size, and guarantee that all of its 400 * descendants will fit within this size. 401 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 402 * child. The child must gurantee that it and all of its descendants will fit 403 * within this size. 404 * </ul> 405 * </p> 406 * 407 * <p> 408 * To intiate a layout, call {@link #requestLayout}. This method is typically 409 * called by a view on itself when it believes that is can no longer fit within 410 * its current bounds. 411 * </p> 412 * 413 * <a name="Drawing"></a> 414 * <h3>Drawing</h3> 415 * <p> 416 * Drawing is handled by walking the tree and rendering each view that 417 * intersects the the invalid region. Because the tree is traversed in-order, 418 * this means that parents will draw before (i.e., behind) their children, with 419 * siblings drawn in the order they appear in the tree. 420 * If you set a background drawable for a View, then the View will draw it for you 421 * before calling back to its <code>onDraw()</code> method. 422 * </p> 423 * 424 * <p> 425 * Note that the framework will not draw views that are not in the invalid region. 426 * </p> 427 * 428 * <p> 429 * To force a view to draw, call {@link #invalidate()}. 430 * </p> 431 * 432 * <a name="EventHandlingThreading"></a> 433 * <h3>Event Handling and Threading</h3> 434 * <p> 435 * The basic cycle of a view is as follows: 436 * <ol> 437 * <li>An event comes in and is dispatched to the appropriate view. The view 438 * handles the event and notifies any listeners.</li> 439 * <li>If in the course of processing the event, the view's bounds may need 440 * to be changed, the view will call {@link #requestLayout()}.</li> 441 * <li>Similarly, if in the course of processing the event the view's appearance 442 * may need to be changed, the view will call {@link #invalidate()}.</li> 443 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 444 * the framework will take care of measuring, laying out, and drawing the tree 445 * as appropriate.</li> 446 * </ol> 447 * </p> 448 * 449 * <p><em>Note: The entire view tree is single threaded. You must always be on 450 * the UI thread when calling any method on any view.</em> 451 * If you are doing work on other threads and want to update the state of a view 452 * from that thread, you should use a {@link Handler}. 453 * </p> 454 * 455 * <a name="FocusHandling"></a> 456 * <h3>Focus Handling</h3> 457 * <p> 458 * The framework will handle routine focus movement in response to user input. 459 * This includes changing the focus as views are removed or hidden, or as new 460 * views become available. Views indicate their willingness to take focus 461 * through the {@link #isFocusable} method. To change whether a view can take 462 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 463 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 464 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 465 * </p> 466 * <p> 467 * Focus movement is based on an algorithm which finds the nearest neighbor in a 468 * given direction. In rare cases, the default algorithm may not match the 469 * intended behavior of the developer. In these situations, you can provide 470 * explicit overrides by using these XML attributes in the layout file: 471 * <pre> 472 * nextFocusDown 473 * nextFocusLeft 474 * nextFocusRight 475 * nextFocusUp 476 * </pre> 477 * </p> 478 * 479 * 480 * <p> 481 * To get a particular view to take focus, call {@link #requestFocus()}. 482 * </p> 483 * 484 * <a name="TouchMode"></a> 485 * <h3>Touch Mode</h3> 486 * <p> 487 * When a user is navigating a user interface via directional keys such as a D-pad, it is 488 * necessary to give focus to actionable items such as buttons so the user can see 489 * what will take input. If the device has touch capabilities, however, and the user 490 * begins interacting with the interface by touching it, it is no longer necessary to 491 * always highlight, or give focus to, a particular view. This motivates a mode 492 * for interaction named 'touch mode'. 493 * </p> 494 * <p> 495 * For a touch capable device, once the user touches the screen, the device 496 * will enter touch mode. From this point onward, only views for which 497 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 498 * Other views that are touchable, like buttons, will not take focus when touched; they will 499 * only fire the on click listeners. 500 * </p> 501 * <p> 502 * Any time a user hits a directional key, such as a D-pad direction, the view device will 503 * exit touch mode, and find a view to take focus, so that the user may resume interacting 504 * with the user interface without touching the screen again. 505 * </p> 506 * <p> 507 * The touch mode state is maintained across {@link android.app.Activity}s. Call 508 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 509 * </p> 510 * 511 * <a name="Scrolling"></a> 512 * <h3>Scrolling</h3> 513 * <p> 514 * The framework provides basic support for views that wish to internally 515 * scroll their content. This includes keeping track of the X and Y scroll 516 * offset as well as mechanisms for drawing scrollbars. See 517 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)} for more details. 518 * </p> 519 * 520 * <a name="Tags"></a> 521 * <h3>Tags</h3> 522 * <p> 523 * Unlike IDs, tags are not used to identify views. Tags are essentially an 524 * extra piece of information that can be associated with a view. They are most 525 * often used as a convenience to store data related to views in the views 526 * themselves rather than by putting them in a separate structure. 527 * </p> 528 * 529 * <a name="Animation"></a> 530 * <h3>Animation</h3> 531 * <p> 532 * You can attach an {@link Animation} object to a view using 533 * {@link #setAnimation(Animation)} or 534 * {@link #startAnimation(Animation)}. The animation can alter the scale, 535 * rotation, translation and alpha of a view over time. If the animation is 536 * attached to a view that has children, the animation will affect the entire 537 * subtree rooted by that node. When an animation is started, the framework will 538 * take care of redrawing the appropriate views until the animation completes. 539 * </p> 540 * 541 * @attr ref android.R.styleable#View_fitsSystemWindows 542 * @attr ref android.R.styleable#View_nextFocusDown 543 * @attr ref android.R.styleable#View_nextFocusLeft 544 * @attr ref android.R.styleable#View_nextFocusRight 545 * @attr ref android.R.styleable#View_nextFocusUp 546 * @attr ref android.R.styleable#View_scrollX 547 * @attr ref android.R.styleable#View_scrollY 548 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 549 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 550 * @attr ref android.R.styleable#View_scrollbarSize 551 * @attr ref android.R.styleable#View_scrollbars 552 * @attr ref android.R.styleable#View_scrollbarThumbVertical 553 * @attr ref android.R.styleable#View_scrollbarTrackVertical 554 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 555 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 556 * 557 * @see android.view.ViewGroup 558 */ 559public class View implements Drawable.Callback, KeyEvent.Callback, AccessibilityEventSource { 560 private static final boolean DBG = false; 561 562 /** 563 * The logging tag used by this class with android.util.Log. 564 */ 565 protected static final String VIEW_LOG_TAG = "View"; 566 567 /** 568 * Used to mark a View that has no ID. 569 */ 570 public static final int NO_ID = -1; 571 572 /** 573 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 574 * calling setFlags. 575 */ 576 private static final int NOT_FOCUSABLE = 0x00000000; 577 578 /** 579 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 580 * setFlags. 581 */ 582 private static final int FOCUSABLE = 0x00000001; 583 584 /** 585 * Mask for use with setFlags indicating bits used for focus. 586 */ 587 private static final int FOCUSABLE_MASK = 0x00000001; 588 589 /** 590 * This view will adjust its padding to fit sytem windows (e.g. status bar) 591 */ 592 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 593 594 /** 595 * This view is visible. Use with {@link #setVisibility}. 596 */ 597 public static final int VISIBLE = 0x00000000; 598 599 /** 600 * This view is invisible, but it still takes up space for layout purposes. 601 * Use with {@link #setVisibility}. 602 */ 603 public static final int INVISIBLE = 0x00000004; 604 605 /** 606 * This view is invisible, and it doesn't take any space for layout 607 * purposes. Use with {@link #setVisibility}. 608 */ 609 public static final int GONE = 0x00000008; 610 611 /** 612 * Mask for use with setFlags indicating bits used for visibility. 613 * {@hide} 614 */ 615 static final int VISIBILITY_MASK = 0x0000000C; 616 617 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 618 619 /** 620 * This view is enabled. Intrepretation varies by subclass. 621 * Use with ENABLED_MASK when calling setFlags. 622 * {@hide} 623 */ 624 static final int ENABLED = 0x00000000; 625 626 /** 627 * This view is disabled. Intrepretation varies by subclass. 628 * Use with ENABLED_MASK when calling setFlags. 629 * {@hide} 630 */ 631 static final int DISABLED = 0x00000020; 632 633 /** 634 * Mask for use with setFlags indicating bits used for indicating whether 635 * this view is enabled 636 * {@hide} 637 */ 638 static final int ENABLED_MASK = 0x00000020; 639 640 /** 641 * This view won't draw. {@link #onDraw} won't be called and further 642 * optimizations 643 * will be performed. It is okay to have this flag set and a background. 644 * Use with DRAW_MASK when calling setFlags. 645 * {@hide} 646 */ 647 static final int WILL_NOT_DRAW = 0x00000080; 648 649 /** 650 * Mask for use with setFlags indicating bits used for indicating whether 651 * this view is will draw 652 * {@hide} 653 */ 654 static final int DRAW_MASK = 0x00000080; 655 656 /** 657 * <p>This view doesn't show scrollbars.</p> 658 * {@hide} 659 */ 660 static final int SCROLLBARS_NONE = 0x00000000; 661 662 /** 663 * <p>This view shows horizontal scrollbars.</p> 664 * {@hide} 665 */ 666 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 667 668 /** 669 * <p>This view shows vertical scrollbars.</p> 670 * {@hide} 671 */ 672 static final int SCROLLBARS_VERTICAL = 0x00000200; 673 674 /** 675 * <p>Mask for use with setFlags indicating bits used for indicating which 676 * scrollbars are enabled.</p> 677 * {@hide} 678 */ 679 static final int SCROLLBARS_MASK = 0x00000300; 680 681 // note 0x00000400 and 0x00000800 are now available for next flags... 682 683 /** 684 * <p>This view doesn't show fading edges.</p> 685 * {@hide} 686 */ 687 static final int FADING_EDGE_NONE = 0x00000000; 688 689 /** 690 * <p>This view shows horizontal fading edges.</p> 691 * {@hide} 692 */ 693 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 694 695 /** 696 * <p>This view shows vertical fading edges.</p> 697 * {@hide} 698 */ 699 static final int FADING_EDGE_VERTICAL = 0x00002000; 700 701 /** 702 * <p>Mask for use with setFlags indicating bits used for indicating which 703 * fading edges are enabled.</p> 704 * {@hide} 705 */ 706 static final int FADING_EDGE_MASK = 0x00003000; 707 708 /** 709 * <p>Indicates this view can be clicked. When clickable, a View reacts 710 * to clicks by notifying the OnClickListener.<p> 711 * {@hide} 712 */ 713 static final int CLICKABLE = 0x00004000; 714 715 /** 716 * <p>Indicates this view is caching its drawing into a bitmap.</p> 717 * {@hide} 718 */ 719 static final int DRAWING_CACHE_ENABLED = 0x00008000; 720 721 /** 722 * <p>Indicates that no icicle should be saved for this view.<p> 723 * {@hide} 724 */ 725 static final int SAVE_DISABLED = 0x000010000; 726 727 /** 728 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 729 * property.</p> 730 * {@hide} 731 */ 732 static final int SAVE_DISABLED_MASK = 0x000010000; 733 734 /** 735 * <p>Indicates that no drawing cache should ever be created for this view.<p> 736 * {@hide} 737 */ 738 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 739 740 /** 741 * <p>Indicates this view can take / keep focus when int touch mode.</p> 742 * {@hide} 743 */ 744 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 745 746 /** 747 * <p>Enables low quality mode for the drawing cache.</p> 748 */ 749 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 750 751 /** 752 * <p>Enables high quality mode for the drawing cache.</p> 753 */ 754 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 755 756 /** 757 * <p>Enables automatic quality mode for the drawing cache.</p> 758 */ 759 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 760 761 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 762 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 763 }; 764 765 /** 766 * <p>Mask for use with setFlags indicating bits used for the cache 767 * quality property.</p> 768 * {@hide} 769 */ 770 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 771 772 /** 773 * <p> 774 * Indicates this view can be long clicked. When long clickable, a View 775 * reacts to long clicks by notifying the OnLongClickListener or showing a 776 * context menu. 777 * </p> 778 * {@hide} 779 */ 780 static final int LONG_CLICKABLE = 0x00200000; 781 782 /** 783 * <p>Indicates that this view gets its drawable states from its direct parent 784 * and ignores its original internal states.</p> 785 * 786 * @hide 787 */ 788 static final int DUPLICATE_PARENT_STATE = 0x00400000; 789 790 /** 791 * The scrollbar style to display the scrollbars inside the content area, 792 * without increasing the padding. The scrollbars will be overlaid with 793 * translucency on the view's content. 794 */ 795 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 796 797 /** 798 * The scrollbar style to display the scrollbars inside the padded area, 799 * increasing the padding of the view. The scrollbars will not overlap the 800 * content area of the view. 801 */ 802 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 803 804 /** 805 * The scrollbar style to display the scrollbars at the edge of the view, 806 * without increasing the padding. The scrollbars will be overlaid with 807 * translucency. 808 */ 809 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 810 811 /** 812 * The scrollbar style to display the scrollbars at the edge of the view, 813 * increasing the padding of the view. The scrollbars will only overlap the 814 * background, if any. 815 */ 816 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 817 818 /** 819 * Mask to check if the scrollbar style is overlay or inset. 820 * {@hide} 821 */ 822 static final int SCROLLBARS_INSET_MASK = 0x01000000; 823 824 /** 825 * Mask to check if the scrollbar style is inside or outside. 826 * {@hide} 827 */ 828 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 829 830 /** 831 * Mask for scrollbar style. 832 * {@hide} 833 */ 834 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 835 836 /** 837 * View flag indicating that the screen should remain on while the 838 * window containing this view is visible to the user. This effectively 839 * takes care of automatically setting the WindowManager's 840 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 841 */ 842 public static final int KEEP_SCREEN_ON = 0x04000000; 843 844 /** 845 * View flag indicating whether this view should have sound effects enabled 846 * for events such as clicking and touching. 847 */ 848 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 849 850 /** 851 * View flag indicating whether this view should have haptic feedback 852 * enabled for events such as long presses. 853 */ 854 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 855 856 /** 857 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 858 * should add all focusable Views regardless if they are focusable in touch mode. 859 */ 860 public static final int FOCUSABLES_ALL = 0x00000000; 861 862 /** 863 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 864 * should add only Views focusable in touch mode. 865 */ 866 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 867 868 /** 869 * Use with {@link #focusSearch}. Move focus to the previous selectable 870 * item. 871 */ 872 public static final int FOCUS_BACKWARD = 0x00000001; 873 874 /** 875 * Use with {@link #focusSearch}. Move focus to the next selectable 876 * item. 877 */ 878 public static final int FOCUS_FORWARD = 0x00000002; 879 880 /** 881 * Use with {@link #focusSearch}. Move focus to the left. 882 */ 883 public static final int FOCUS_LEFT = 0x00000011; 884 885 /** 886 * Use with {@link #focusSearch}. Move focus up. 887 */ 888 public static final int FOCUS_UP = 0x00000021; 889 890 /** 891 * Use with {@link #focusSearch}. Move focus to the right. 892 */ 893 public static final int FOCUS_RIGHT = 0x00000042; 894 895 /** 896 * Use with {@link #focusSearch}. Move focus down. 897 */ 898 public static final int FOCUS_DOWN = 0x00000082; 899 900 /** 901 * Base View state sets 902 */ 903 // Singles 904 /** 905 * Indicates the view has no states set. States are used with 906 * {@link android.graphics.drawable.Drawable} to change the drawing of the 907 * view depending on its state. 908 * 909 * @see android.graphics.drawable.Drawable 910 * @see #getDrawableState() 911 */ 912 protected static final int[] EMPTY_STATE_SET = {}; 913 /** 914 * Indicates the view is enabled. States are used with 915 * {@link android.graphics.drawable.Drawable} to change the drawing of the 916 * view depending on its state. 917 * 918 * @see android.graphics.drawable.Drawable 919 * @see #getDrawableState() 920 */ 921 protected static final int[] ENABLED_STATE_SET = {R.attr.state_enabled}; 922 /** 923 * Indicates the view is focused. States are used with 924 * {@link android.graphics.drawable.Drawable} to change the drawing of the 925 * view depending on its state. 926 * 927 * @see android.graphics.drawable.Drawable 928 * @see #getDrawableState() 929 */ 930 protected static final int[] FOCUSED_STATE_SET = {R.attr.state_focused}; 931 /** 932 * Indicates the view is selected. States are used with 933 * {@link android.graphics.drawable.Drawable} to change the drawing of the 934 * view depending on its state. 935 * 936 * @see android.graphics.drawable.Drawable 937 * @see #getDrawableState() 938 */ 939 protected static final int[] SELECTED_STATE_SET = {R.attr.state_selected}; 940 /** 941 * Indicates the view is pressed. States are used with 942 * {@link android.graphics.drawable.Drawable} to change the drawing of the 943 * view depending on its state. 944 * 945 * @see android.graphics.drawable.Drawable 946 * @see #getDrawableState() 947 * @hide 948 */ 949 protected static final int[] PRESSED_STATE_SET = {R.attr.state_pressed}; 950 /** 951 * Indicates the view's window has focus. States are used with 952 * {@link android.graphics.drawable.Drawable} to change the drawing of the 953 * view depending on its state. 954 * 955 * @see android.graphics.drawable.Drawable 956 * @see #getDrawableState() 957 */ 958 protected static final int[] WINDOW_FOCUSED_STATE_SET = 959 {R.attr.state_window_focused}; 960 // Doubles 961 /** 962 * Indicates the view is enabled and has the focus. 963 * 964 * @see #ENABLED_STATE_SET 965 * @see #FOCUSED_STATE_SET 966 */ 967 protected static final int[] ENABLED_FOCUSED_STATE_SET = 968 stateSetUnion(ENABLED_STATE_SET, FOCUSED_STATE_SET); 969 /** 970 * Indicates the view is enabled and selected. 971 * 972 * @see #ENABLED_STATE_SET 973 * @see #SELECTED_STATE_SET 974 */ 975 protected static final int[] ENABLED_SELECTED_STATE_SET = 976 stateSetUnion(ENABLED_STATE_SET, SELECTED_STATE_SET); 977 /** 978 * Indicates the view is enabled and that its window has focus. 979 * 980 * @see #ENABLED_STATE_SET 981 * @see #WINDOW_FOCUSED_STATE_SET 982 */ 983 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET = 984 stateSetUnion(ENABLED_STATE_SET, WINDOW_FOCUSED_STATE_SET); 985 /** 986 * Indicates the view is focused and selected. 987 * 988 * @see #FOCUSED_STATE_SET 989 * @see #SELECTED_STATE_SET 990 */ 991 protected static final int[] FOCUSED_SELECTED_STATE_SET = 992 stateSetUnion(FOCUSED_STATE_SET, SELECTED_STATE_SET); 993 /** 994 * Indicates the view has the focus and that its window has the focus. 995 * 996 * @see #FOCUSED_STATE_SET 997 * @see #WINDOW_FOCUSED_STATE_SET 998 */ 999 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET = 1000 stateSetUnion(FOCUSED_STATE_SET, WINDOW_FOCUSED_STATE_SET); 1001 /** 1002 * Indicates the view is selected and that its window has the focus. 1003 * 1004 * @see #SELECTED_STATE_SET 1005 * @see #WINDOW_FOCUSED_STATE_SET 1006 */ 1007 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET = 1008 stateSetUnion(SELECTED_STATE_SET, WINDOW_FOCUSED_STATE_SET); 1009 // Triples 1010 /** 1011 * Indicates the view is enabled, focused and selected. 1012 * 1013 * @see #ENABLED_STATE_SET 1014 * @see #FOCUSED_STATE_SET 1015 * @see #SELECTED_STATE_SET 1016 */ 1017 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET = 1018 stateSetUnion(ENABLED_FOCUSED_STATE_SET, SELECTED_STATE_SET); 1019 /** 1020 * Indicates the view is enabled, focused and its window has the focus. 1021 * 1022 * @see #ENABLED_STATE_SET 1023 * @see #FOCUSED_STATE_SET 1024 * @see #WINDOW_FOCUSED_STATE_SET 1025 */ 1026 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = 1027 stateSetUnion(ENABLED_FOCUSED_STATE_SET, WINDOW_FOCUSED_STATE_SET); 1028 /** 1029 * Indicates the view is enabled, selected and its window has the focus. 1030 * 1031 * @see #ENABLED_STATE_SET 1032 * @see #SELECTED_STATE_SET 1033 * @see #WINDOW_FOCUSED_STATE_SET 1034 */ 1035 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = 1036 stateSetUnion(ENABLED_SELECTED_STATE_SET, WINDOW_FOCUSED_STATE_SET); 1037 /** 1038 * Indicates the view is focused, selected and its window has the focus. 1039 * 1040 * @see #FOCUSED_STATE_SET 1041 * @see #SELECTED_STATE_SET 1042 * @see #WINDOW_FOCUSED_STATE_SET 1043 */ 1044 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = 1045 stateSetUnion(FOCUSED_SELECTED_STATE_SET, WINDOW_FOCUSED_STATE_SET); 1046 /** 1047 * Indicates the view is enabled, focused, selected and its window 1048 * has the focus. 1049 * 1050 * @see #ENABLED_STATE_SET 1051 * @see #FOCUSED_STATE_SET 1052 * @see #SELECTED_STATE_SET 1053 * @see #WINDOW_FOCUSED_STATE_SET 1054 */ 1055 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = 1056 stateSetUnion(ENABLED_FOCUSED_SELECTED_STATE_SET, 1057 WINDOW_FOCUSED_STATE_SET); 1058 1059 /** 1060 * Indicates the view is pressed and its window has the focus. 1061 * 1062 * @see #PRESSED_STATE_SET 1063 * @see #WINDOW_FOCUSED_STATE_SET 1064 */ 1065 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET = 1066 stateSetUnion(PRESSED_STATE_SET, WINDOW_FOCUSED_STATE_SET); 1067 1068 /** 1069 * Indicates the view is pressed and selected. 1070 * 1071 * @see #PRESSED_STATE_SET 1072 * @see #SELECTED_STATE_SET 1073 */ 1074 protected static final int[] PRESSED_SELECTED_STATE_SET = 1075 stateSetUnion(PRESSED_STATE_SET, SELECTED_STATE_SET); 1076 1077 /** 1078 * Indicates the view is pressed, selected and its window has the focus. 1079 * 1080 * @see #PRESSED_STATE_SET 1081 * @see #SELECTED_STATE_SET 1082 * @see #WINDOW_FOCUSED_STATE_SET 1083 */ 1084 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = 1085 stateSetUnion(PRESSED_SELECTED_STATE_SET, WINDOW_FOCUSED_STATE_SET); 1086 1087 /** 1088 * Indicates the view is pressed and focused. 1089 * 1090 * @see #PRESSED_STATE_SET 1091 * @see #FOCUSED_STATE_SET 1092 */ 1093 protected static final int[] PRESSED_FOCUSED_STATE_SET = 1094 stateSetUnion(PRESSED_STATE_SET, FOCUSED_STATE_SET); 1095 1096 /** 1097 * Indicates the view is pressed, focused and its window has the focus. 1098 * 1099 * @see #PRESSED_STATE_SET 1100 * @see #FOCUSED_STATE_SET 1101 * @see #WINDOW_FOCUSED_STATE_SET 1102 */ 1103 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = 1104 stateSetUnion(PRESSED_FOCUSED_STATE_SET, WINDOW_FOCUSED_STATE_SET); 1105 1106 /** 1107 * Indicates the view is pressed, focused and selected. 1108 * 1109 * @see #PRESSED_STATE_SET 1110 * @see #SELECTED_STATE_SET 1111 * @see #FOCUSED_STATE_SET 1112 */ 1113 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET = 1114 stateSetUnion(PRESSED_FOCUSED_STATE_SET, SELECTED_STATE_SET); 1115 1116 /** 1117 * Indicates the view is pressed, focused, selected and its window has the focus. 1118 * 1119 * @see #PRESSED_STATE_SET 1120 * @see #FOCUSED_STATE_SET 1121 * @see #SELECTED_STATE_SET 1122 * @see #WINDOW_FOCUSED_STATE_SET 1123 */ 1124 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = 1125 stateSetUnion(PRESSED_FOCUSED_SELECTED_STATE_SET, WINDOW_FOCUSED_STATE_SET); 1126 1127 /** 1128 * Indicates the view is pressed and enabled. 1129 * 1130 * @see #PRESSED_STATE_SET 1131 * @see #ENABLED_STATE_SET 1132 */ 1133 protected static final int[] PRESSED_ENABLED_STATE_SET = 1134 stateSetUnion(PRESSED_STATE_SET, ENABLED_STATE_SET); 1135 1136 /** 1137 * Indicates the view is pressed, enabled and its window has the focus. 1138 * 1139 * @see #PRESSED_STATE_SET 1140 * @see #ENABLED_STATE_SET 1141 * @see #WINDOW_FOCUSED_STATE_SET 1142 */ 1143 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = 1144 stateSetUnion(PRESSED_ENABLED_STATE_SET, WINDOW_FOCUSED_STATE_SET); 1145 1146 /** 1147 * Indicates the view is pressed, enabled and selected. 1148 * 1149 * @see #PRESSED_STATE_SET 1150 * @see #ENABLED_STATE_SET 1151 * @see #SELECTED_STATE_SET 1152 */ 1153 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET = 1154 stateSetUnion(PRESSED_ENABLED_STATE_SET, SELECTED_STATE_SET); 1155 1156 /** 1157 * Indicates the view is pressed, enabled, selected and its window has the 1158 * focus. 1159 * 1160 * @see #PRESSED_STATE_SET 1161 * @see #ENABLED_STATE_SET 1162 * @see #SELECTED_STATE_SET 1163 * @see #WINDOW_FOCUSED_STATE_SET 1164 */ 1165 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = 1166 stateSetUnion(PRESSED_ENABLED_SELECTED_STATE_SET, WINDOW_FOCUSED_STATE_SET); 1167 1168 /** 1169 * Indicates the view is pressed, enabled and focused. 1170 * 1171 * @see #PRESSED_STATE_SET 1172 * @see #ENABLED_STATE_SET 1173 * @see #FOCUSED_STATE_SET 1174 */ 1175 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET = 1176 stateSetUnion(PRESSED_ENABLED_STATE_SET, FOCUSED_STATE_SET); 1177 1178 /** 1179 * Indicates the view is pressed, enabled, focused and its window has the 1180 * focus. 1181 * 1182 * @see #PRESSED_STATE_SET 1183 * @see #ENABLED_STATE_SET 1184 * @see #FOCUSED_STATE_SET 1185 * @see #WINDOW_FOCUSED_STATE_SET 1186 */ 1187 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = 1188 stateSetUnion(PRESSED_ENABLED_FOCUSED_STATE_SET, WINDOW_FOCUSED_STATE_SET); 1189 1190 /** 1191 * Indicates the view is pressed, enabled, focused and selected. 1192 * 1193 * @see #PRESSED_STATE_SET 1194 * @see #ENABLED_STATE_SET 1195 * @see #SELECTED_STATE_SET 1196 * @see #FOCUSED_STATE_SET 1197 */ 1198 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = 1199 stateSetUnion(PRESSED_ENABLED_FOCUSED_STATE_SET, SELECTED_STATE_SET); 1200 1201 /** 1202 * Indicates the view is pressed, enabled, focused, selected and its window 1203 * has the focus. 1204 * 1205 * @see #PRESSED_STATE_SET 1206 * @see #ENABLED_STATE_SET 1207 * @see #SELECTED_STATE_SET 1208 * @see #FOCUSED_STATE_SET 1209 * @see #WINDOW_FOCUSED_STATE_SET 1210 */ 1211 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = 1212 stateSetUnion(PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET, WINDOW_FOCUSED_STATE_SET); 1213 1214 /** 1215 * The order here is very important to {@link #getDrawableState()} 1216 */ 1217 private static final int[][] VIEW_STATE_SETS = { 1218 EMPTY_STATE_SET, // 0 0 0 0 0 1219 WINDOW_FOCUSED_STATE_SET, // 0 0 0 0 1 1220 SELECTED_STATE_SET, // 0 0 0 1 0 1221 SELECTED_WINDOW_FOCUSED_STATE_SET, // 0 0 0 1 1 1222 FOCUSED_STATE_SET, // 0 0 1 0 0 1223 FOCUSED_WINDOW_FOCUSED_STATE_SET, // 0 0 1 0 1 1224 FOCUSED_SELECTED_STATE_SET, // 0 0 1 1 0 1225 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 0 0 1 1 1 1226 ENABLED_STATE_SET, // 0 1 0 0 0 1227 ENABLED_WINDOW_FOCUSED_STATE_SET, // 0 1 0 0 1 1228 ENABLED_SELECTED_STATE_SET, // 0 1 0 1 0 1229 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 0 1 0 1 1 1230 ENABLED_FOCUSED_STATE_SET, // 0 1 1 0 0 1231 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET, // 0 1 1 0 1 1232 ENABLED_FOCUSED_SELECTED_STATE_SET, // 0 1 1 1 0 1233 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 0 1 1 1 1 1234 PRESSED_STATE_SET, // 1 0 0 0 0 1235 PRESSED_WINDOW_FOCUSED_STATE_SET, // 1 0 0 0 1 1236 PRESSED_SELECTED_STATE_SET, // 1 0 0 1 0 1237 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 1 0 0 1 1 1238 PRESSED_FOCUSED_STATE_SET, // 1 0 1 0 0 1239 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET, // 1 0 1 0 1 1240 PRESSED_FOCUSED_SELECTED_STATE_SET, // 1 0 1 1 0 1241 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 1 0 1 1 1 1242 PRESSED_ENABLED_STATE_SET, // 1 1 0 0 0 1243 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET, // 1 1 0 0 1 1244 PRESSED_ENABLED_SELECTED_STATE_SET, // 1 1 0 1 0 1245 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 1 1 0 1 1 1246 PRESSED_ENABLED_FOCUSED_STATE_SET, // 1 1 1 0 0 1247 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET, // 1 1 1 0 1 1248 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET, // 1 1 1 1 0 1249 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 1 1 1 1 1 1250 }; 1251 1252 /** 1253 * Used by views that contain lists of items. This state indicates that 1254 * the view is showing the last item. 1255 * @hide 1256 */ 1257 protected static final int[] LAST_STATE_SET = {R.attr.state_last}; 1258 /** 1259 * Used by views that contain lists of items. This state indicates that 1260 * the view is showing the first item. 1261 * @hide 1262 */ 1263 protected static final int[] FIRST_STATE_SET = {R.attr.state_first}; 1264 /** 1265 * Used by views that contain lists of items. This state indicates that 1266 * the view is showing the middle item. 1267 * @hide 1268 */ 1269 protected static final int[] MIDDLE_STATE_SET = {R.attr.state_middle}; 1270 /** 1271 * Used by views that contain lists of items. This state indicates that 1272 * the view is showing only one item. 1273 * @hide 1274 */ 1275 protected static final int[] SINGLE_STATE_SET = {R.attr.state_single}; 1276 /** 1277 * Used by views that contain lists of items. This state indicates that 1278 * the view is pressed and showing the last item. 1279 * @hide 1280 */ 1281 protected static final int[] PRESSED_LAST_STATE_SET = {R.attr.state_last, R.attr.state_pressed}; 1282 /** 1283 * Used by views that contain lists of items. This state indicates that 1284 * the view is pressed and showing the first item. 1285 * @hide 1286 */ 1287 protected static final int[] PRESSED_FIRST_STATE_SET = {R.attr.state_first, R.attr.state_pressed}; 1288 /** 1289 * Used by views that contain lists of items. This state indicates that 1290 * the view is pressed and showing the middle item. 1291 * @hide 1292 */ 1293 protected static final int[] PRESSED_MIDDLE_STATE_SET = {R.attr.state_middle, R.attr.state_pressed}; 1294 /** 1295 * Used by views that contain lists of items. This state indicates that 1296 * the view is pressed and showing only one item. 1297 * @hide 1298 */ 1299 protected static final int[] PRESSED_SINGLE_STATE_SET = {R.attr.state_single, R.attr.state_pressed}; 1300 1301 /** 1302 * Temporary Rect currently for use in setBackground(). This will probably 1303 * be extended in the future to hold our own class with more than just 1304 * a Rect. :) 1305 */ 1306 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1307 1308 /** 1309 * Map used to store views' tags. 1310 */ 1311 private static WeakHashMap<View, SparseArray<Object>> sTags; 1312 1313 /** 1314 * Lock used to access sTags. 1315 */ 1316 private static final Object sTagsLock = new Object(); 1317 1318 /** 1319 * The animation currently associated with this view. 1320 * @hide 1321 */ 1322 protected Animation mCurrentAnimation = null; 1323 1324 /** 1325 * Width as measured during measure pass. 1326 * {@hide} 1327 */ 1328 @ViewDebug.ExportedProperty 1329 protected int mMeasuredWidth; 1330 1331 /** 1332 * Height as measured during measure pass. 1333 * {@hide} 1334 */ 1335 @ViewDebug.ExportedProperty 1336 protected int mMeasuredHeight; 1337 1338 /** 1339 * The view's identifier. 1340 * {@hide} 1341 * 1342 * @see #setId(int) 1343 * @see #getId() 1344 */ 1345 @ViewDebug.ExportedProperty(resolveId = true) 1346 int mID = NO_ID; 1347 1348 /** 1349 * The view's tag. 1350 * {@hide} 1351 * 1352 * @see #setTag(Object) 1353 * @see #getTag() 1354 */ 1355 protected Object mTag; 1356 1357 // for mPrivateFlags: 1358 /** {@hide} */ 1359 static final int WANTS_FOCUS = 0x00000001; 1360 /** {@hide} */ 1361 static final int FOCUSED = 0x00000002; 1362 /** {@hide} */ 1363 static final int SELECTED = 0x00000004; 1364 /** {@hide} */ 1365 static final int IS_ROOT_NAMESPACE = 0x00000008; 1366 /** {@hide} */ 1367 static final int HAS_BOUNDS = 0x00000010; 1368 /** {@hide} */ 1369 static final int DRAWN = 0x00000020; 1370 /** 1371 * When this flag is set, this view is running an animation on behalf of its 1372 * children and should therefore not cancel invalidate requests, even if they 1373 * lie outside of this view's bounds. 1374 * 1375 * {@hide} 1376 */ 1377 static final int DRAW_ANIMATION = 0x00000040; 1378 /** {@hide} */ 1379 static final int SKIP_DRAW = 0x00000080; 1380 /** {@hide} */ 1381 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1382 /** {@hide} */ 1383 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1384 /** {@hide} */ 1385 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1386 /** {@hide} */ 1387 static final int MEASURED_DIMENSION_SET = 0x00000800; 1388 /** {@hide} */ 1389 static final int FORCE_LAYOUT = 0x00001000; 1390 1391 private static final int LAYOUT_REQUIRED = 0x00002000; 1392 1393 private static final int PRESSED = 0x00004000; 1394 1395 /** {@hide} */ 1396 static final int DRAWING_CACHE_VALID = 0x00008000; 1397 /** 1398 * Flag used to indicate that this view should be drawn once more (and only once 1399 * more) after its animation has completed. 1400 * {@hide} 1401 */ 1402 static final int ANIMATION_STARTED = 0x00010000; 1403 1404 private static final int SAVE_STATE_CALLED = 0x00020000; 1405 1406 /** 1407 * Indicates that the View returned true when onSetAlpha() was called and that 1408 * the alpha must be restored. 1409 * {@hide} 1410 */ 1411 static final int ALPHA_SET = 0x00040000; 1412 1413 /** 1414 * Set by {@link #setScrollContainer(boolean)}. 1415 */ 1416 static final int SCROLL_CONTAINER = 0x00080000; 1417 1418 /** 1419 * Set by {@link #setScrollContainer(boolean)}. 1420 */ 1421 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1422 1423 /** 1424 * View flag indicating whether this view was invalidated (fully or partially.) 1425 * 1426 * @hide 1427 */ 1428 static final int DIRTY = 0x00200000; 1429 1430 /** 1431 * View flag indicating whether this view was invalidated by an opaque 1432 * invalidate request. 1433 * 1434 * @hide 1435 */ 1436 static final int DIRTY_OPAQUE = 0x00400000; 1437 1438 /** 1439 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1440 * 1441 * @hide 1442 */ 1443 static final int DIRTY_MASK = 0x00600000; 1444 1445 /** 1446 * Indicates whether the background is opaque. 1447 * 1448 * @hide 1449 */ 1450 static final int OPAQUE_BACKGROUND = 0x00800000; 1451 1452 /** 1453 * Indicates whether the scrollbars are opaque. 1454 * 1455 * @hide 1456 */ 1457 static final int OPAQUE_SCROLLBARS = 0x01000000; 1458 1459 /** 1460 * Indicates whether the view is opaque. 1461 * 1462 * @hide 1463 */ 1464 static final int OPAQUE_MASK = 0x01800000; 1465 1466 /** 1467 * The parent this view is attached to. 1468 * {@hide} 1469 * 1470 * @see #getParent() 1471 */ 1472 protected ViewParent mParent; 1473 1474 /** 1475 * {@hide} 1476 */ 1477 AttachInfo mAttachInfo; 1478 1479 /** 1480 * {@hide} 1481 */ 1482 @ViewDebug.ExportedProperty(flagMapping = { 1483 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 1484 name = "FORCE_LAYOUT"), 1485 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 1486 name = "LAYOUT_REQUIRED"), 1487 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 1488 name = "DRAWING_CACHE_INVALID", outputIf = false), 1489 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 1490 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 1491 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 1492 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 1493 }) 1494 int mPrivateFlags; 1495 1496 /** 1497 * Count of how many windows this view has been attached to. 1498 */ 1499 int mWindowAttachCount; 1500 1501 /** 1502 * The layout parameters associated with this view and used by the parent 1503 * {@link android.view.ViewGroup} to determine how this view should be 1504 * laid out. 1505 * {@hide} 1506 */ 1507 protected ViewGroup.LayoutParams mLayoutParams; 1508 1509 /** 1510 * The view flags hold various views states. 1511 * {@hide} 1512 */ 1513 @ViewDebug.ExportedProperty 1514 int mViewFlags; 1515 1516 /** 1517 * The distance in pixels from the left edge of this view's parent 1518 * to the left edge of this view. 1519 * {@hide} 1520 */ 1521 @ViewDebug.ExportedProperty 1522 protected int mLeft; 1523 /** 1524 * The distance in pixels from the left edge of this view's parent 1525 * to the right edge of this view. 1526 * {@hide} 1527 */ 1528 @ViewDebug.ExportedProperty 1529 protected int mRight; 1530 /** 1531 * The distance in pixels from the top edge of this view's parent 1532 * to the top edge of this view. 1533 * {@hide} 1534 */ 1535 @ViewDebug.ExportedProperty 1536 protected int mTop; 1537 /** 1538 * The distance in pixels from the top edge of this view's parent 1539 * to the bottom edge of this view. 1540 * {@hide} 1541 */ 1542 @ViewDebug.ExportedProperty 1543 protected int mBottom; 1544 1545 /** 1546 * The offset, in pixels, by which the content of this view is scrolled 1547 * horizontally. 1548 * {@hide} 1549 */ 1550 @ViewDebug.ExportedProperty 1551 protected int mScrollX; 1552 /** 1553 * The offset, in pixels, by which the content of this view is scrolled 1554 * vertically. 1555 * {@hide} 1556 */ 1557 @ViewDebug.ExportedProperty 1558 protected int mScrollY; 1559 1560 /** 1561 * The left padding in pixels, that is the distance in pixels between the 1562 * left edge of this view and the left edge of its content. 1563 * {@hide} 1564 */ 1565 @ViewDebug.ExportedProperty 1566 protected int mPaddingLeft; 1567 /** 1568 * The right padding in pixels, that is the distance in pixels between the 1569 * right edge of this view and the right edge of its content. 1570 * {@hide} 1571 */ 1572 @ViewDebug.ExportedProperty 1573 protected int mPaddingRight; 1574 /** 1575 * The top padding in pixels, that is the distance in pixels between the 1576 * top edge of this view and the top edge of its content. 1577 * {@hide} 1578 */ 1579 @ViewDebug.ExportedProperty 1580 protected int mPaddingTop; 1581 /** 1582 * The bottom padding in pixels, that is the distance in pixels between the 1583 * bottom edge of this view and the bottom edge of its content. 1584 * {@hide} 1585 */ 1586 @ViewDebug.ExportedProperty 1587 protected int mPaddingBottom; 1588 1589 /** 1590 * Briefly describes the view and is primarily used for accessibility support. 1591 */ 1592 private CharSequence mContentDescription; 1593 1594 /** 1595 * Cache the paddingRight set by the user to append to the scrollbar's size. 1596 */ 1597 @ViewDebug.ExportedProperty 1598 int mUserPaddingRight; 1599 1600 /** 1601 * Cache the paddingBottom set by the user to append to the scrollbar's size. 1602 */ 1603 @ViewDebug.ExportedProperty 1604 int mUserPaddingBottom; 1605 1606 /** 1607 * @hide 1608 */ 1609 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 1610 /** 1611 * @hide 1612 */ 1613 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 1614 1615 private Resources mResources = null; 1616 1617 private Drawable mBGDrawable; 1618 1619 private int mBackgroundResource; 1620 private boolean mBackgroundSizeChanged; 1621 1622 /** 1623 * Listener used to dispatch focus change events. 1624 * This field should be made private, so it is hidden from the SDK. 1625 * {@hide} 1626 */ 1627 protected OnFocusChangeListener mOnFocusChangeListener; 1628 1629 /** 1630 * Listener used to dispatch click events. 1631 * This field should be made private, so it is hidden from the SDK. 1632 * {@hide} 1633 */ 1634 protected OnClickListener mOnClickListener; 1635 1636 /** 1637 * Listener used to dispatch long click events. 1638 * This field should be made private, so it is hidden from the SDK. 1639 * {@hide} 1640 */ 1641 protected OnLongClickListener mOnLongClickListener; 1642 1643 /** 1644 * Listener used to build the context menu. 1645 * This field should be made private, so it is hidden from the SDK. 1646 * {@hide} 1647 */ 1648 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 1649 1650 private OnKeyListener mOnKeyListener; 1651 1652 private OnTouchListener mOnTouchListener; 1653 1654 /** 1655 * The application environment this view lives in. 1656 * This field should be made private, so it is hidden from the SDK. 1657 * {@hide} 1658 */ 1659 protected Context mContext; 1660 1661 private ScrollabilityCache mScrollCache; 1662 1663 private int[] mDrawableState = null; 1664 1665 private SoftReference<Bitmap> mDrawingCache; 1666 1667 /** 1668 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 1669 * the user may specify which view to go to next. 1670 */ 1671 private int mNextFocusLeftId = View.NO_ID; 1672 1673 /** 1674 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 1675 * the user may specify which view to go to next. 1676 */ 1677 private int mNextFocusRightId = View.NO_ID; 1678 1679 /** 1680 * When this view has focus and the next focus is {@link #FOCUS_UP}, 1681 * the user may specify which view to go to next. 1682 */ 1683 private int mNextFocusUpId = View.NO_ID; 1684 1685 /** 1686 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 1687 * the user may specify which view to go to next. 1688 */ 1689 private int mNextFocusDownId = View.NO_ID; 1690 1691 private CheckForLongPress mPendingCheckForLongPress; 1692 private UnsetPressedState mUnsetPressedState; 1693 1694 /** 1695 * Whether the long press's action has been invoked. The tap's action is invoked on the 1696 * up event while a long press is invoked as soon as the long press duration is reached, so 1697 * a long press could be performed before the tap is checked, in which case the tap's action 1698 * should not be invoked. 1699 */ 1700 private boolean mHasPerformedLongPress; 1701 1702 /** 1703 * The minimum height of the view. We'll try our best to have the height 1704 * of this view to at least this amount. 1705 */ 1706 @ViewDebug.ExportedProperty 1707 private int mMinHeight; 1708 1709 /** 1710 * The minimum width of the view. We'll try our best to have the width 1711 * of this view to at least this amount. 1712 */ 1713 @ViewDebug.ExportedProperty 1714 private int mMinWidth; 1715 1716 /** 1717 * The delegate to handle touch events that are physically in this view 1718 * but should be handled by another view. 1719 */ 1720 private TouchDelegate mTouchDelegate = null; 1721 1722 /** 1723 * Solid color to use as a background when creating the drawing cache. Enables 1724 * the cache to use 16 bit bitmaps instead of 32 bit. 1725 */ 1726 private int mDrawingCacheBackgroundColor = 0; 1727 1728 /** 1729 * Special tree observer used when mAttachInfo is null. 1730 */ 1731 private ViewTreeObserver mFloatingTreeObserver; 1732 1733 // Used for debug only 1734 static long sInstanceCount = 0; 1735 1736 /** 1737 * Simple constructor to use when creating a view from code. 1738 * 1739 * @param context The Context the view is running in, through which it can 1740 * access the current theme, resources, etc. 1741 */ 1742 public View(Context context) { 1743 mContext = context; 1744 mResources = context != null ? context.getResources() : null; 1745 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 1746 ++sInstanceCount; 1747 } 1748 1749 /** 1750 * Constructor that is called when inflating a view from XML. This is called 1751 * when a view is being constructed from an XML file, supplying attributes 1752 * that were specified in the XML file. This version uses a default style of 1753 * 0, so the only attribute values applied are those in the Context's Theme 1754 * and the given AttributeSet. 1755 * 1756 * <p> 1757 * The method onFinishInflate() will be called after all children have been 1758 * added. 1759 * 1760 * @param context The Context the view is running in, through which it can 1761 * access the current theme, resources, etc. 1762 * @param attrs The attributes of the XML tag that is inflating the view. 1763 * @see #View(Context, AttributeSet, int) 1764 */ 1765 public View(Context context, AttributeSet attrs) { 1766 this(context, attrs, 0); 1767 } 1768 1769 /** 1770 * Perform inflation from XML and apply a class-specific base style. This 1771 * constructor of View allows subclasses to use their own base style when 1772 * they are inflating. For example, a Button class's constructor would call 1773 * this version of the super class constructor and supply 1774 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 1775 * the theme's button style to modify all of the base view attributes (in 1776 * particular its background) as well as the Button class's attributes. 1777 * 1778 * @param context The Context the view is running in, through which it can 1779 * access the current theme, resources, etc. 1780 * @param attrs The attributes of the XML tag that is inflating the view. 1781 * @param defStyle The default style to apply to this view. If 0, no style 1782 * will be applied (beyond what is included in the theme). This may 1783 * either be an attribute resource, whose value will be retrieved 1784 * from the current theme, or an explicit style resource. 1785 * @see #View(Context, AttributeSet) 1786 */ 1787 public View(Context context, AttributeSet attrs, int defStyle) { 1788 this(context); 1789 1790 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 1791 defStyle, 0); 1792 1793 Drawable background = null; 1794 1795 int leftPadding = -1; 1796 int topPadding = -1; 1797 int rightPadding = -1; 1798 int bottomPadding = -1; 1799 1800 int padding = -1; 1801 1802 int viewFlagValues = 0; 1803 int viewFlagMasks = 0; 1804 1805 boolean setScrollContainer = false; 1806 1807 int x = 0; 1808 int y = 0; 1809 1810 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 1811 1812 final int N = a.getIndexCount(); 1813 for (int i = 0; i < N; i++) { 1814 int attr = a.getIndex(i); 1815 switch (attr) { 1816 case com.android.internal.R.styleable.View_background: 1817 background = a.getDrawable(attr); 1818 break; 1819 case com.android.internal.R.styleable.View_padding: 1820 padding = a.getDimensionPixelSize(attr, -1); 1821 break; 1822 case com.android.internal.R.styleable.View_paddingLeft: 1823 leftPadding = a.getDimensionPixelSize(attr, -1); 1824 break; 1825 case com.android.internal.R.styleable.View_paddingTop: 1826 topPadding = a.getDimensionPixelSize(attr, -1); 1827 break; 1828 case com.android.internal.R.styleable.View_paddingRight: 1829 rightPadding = a.getDimensionPixelSize(attr, -1); 1830 break; 1831 case com.android.internal.R.styleable.View_paddingBottom: 1832 bottomPadding = a.getDimensionPixelSize(attr, -1); 1833 break; 1834 case com.android.internal.R.styleable.View_scrollX: 1835 x = a.getDimensionPixelOffset(attr, 0); 1836 break; 1837 case com.android.internal.R.styleable.View_scrollY: 1838 y = a.getDimensionPixelOffset(attr, 0); 1839 break; 1840 case com.android.internal.R.styleable.View_id: 1841 mID = a.getResourceId(attr, NO_ID); 1842 break; 1843 case com.android.internal.R.styleable.View_tag: 1844 mTag = a.getText(attr); 1845 break; 1846 case com.android.internal.R.styleable.View_fitsSystemWindows: 1847 if (a.getBoolean(attr, false)) { 1848 viewFlagValues |= FITS_SYSTEM_WINDOWS; 1849 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 1850 } 1851 break; 1852 case com.android.internal.R.styleable.View_focusable: 1853 if (a.getBoolean(attr, false)) { 1854 viewFlagValues |= FOCUSABLE; 1855 viewFlagMasks |= FOCUSABLE_MASK; 1856 } 1857 break; 1858 case com.android.internal.R.styleable.View_focusableInTouchMode: 1859 if (a.getBoolean(attr, false)) { 1860 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 1861 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 1862 } 1863 break; 1864 case com.android.internal.R.styleable.View_clickable: 1865 if (a.getBoolean(attr, false)) { 1866 viewFlagValues |= CLICKABLE; 1867 viewFlagMasks |= CLICKABLE; 1868 } 1869 break; 1870 case com.android.internal.R.styleable.View_longClickable: 1871 if (a.getBoolean(attr, false)) { 1872 viewFlagValues |= LONG_CLICKABLE; 1873 viewFlagMasks |= LONG_CLICKABLE; 1874 } 1875 break; 1876 case com.android.internal.R.styleable.View_saveEnabled: 1877 if (!a.getBoolean(attr, true)) { 1878 viewFlagValues |= SAVE_DISABLED; 1879 viewFlagMasks |= SAVE_DISABLED_MASK; 1880 } 1881 break; 1882 case com.android.internal.R.styleable.View_duplicateParentState: 1883 if (a.getBoolean(attr, false)) { 1884 viewFlagValues |= DUPLICATE_PARENT_STATE; 1885 viewFlagMasks |= DUPLICATE_PARENT_STATE; 1886 } 1887 break; 1888 case com.android.internal.R.styleable.View_visibility: 1889 final int visibility = a.getInt(attr, 0); 1890 if (visibility != 0) { 1891 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 1892 viewFlagMasks |= VISIBILITY_MASK; 1893 } 1894 break; 1895 case com.android.internal.R.styleable.View_drawingCacheQuality: 1896 final int cacheQuality = a.getInt(attr, 0); 1897 if (cacheQuality != 0) { 1898 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 1899 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 1900 } 1901 break; 1902 case com.android.internal.R.styleable.View_contentDescription: 1903 mContentDescription = a.getString(attr); 1904 break; 1905 case com.android.internal.R.styleable.View_soundEffectsEnabled: 1906 if (!a.getBoolean(attr, true)) { 1907 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 1908 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 1909 } 1910 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 1911 if (!a.getBoolean(attr, true)) { 1912 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 1913 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 1914 } 1915 case R.styleable.View_scrollbars: 1916 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 1917 if (scrollbars != SCROLLBARS_NONE) { 1918 viewFlagValues |= scrollbars; 1919 viewFlagMasks |= SCROLLBARS_MASK; 1920 initializeScrollbars(a); 1921 } 1922 break; 1923 case R.styleable.View_fadingEdge: 1924 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 1925 if (fadingEdge != FADING_EDGE_NONE) { 1926 viewFlagValues |= fadingEdge; 1927 viewFlagMasks |= FADING_EDGE_MASK; 1928 initializeFadingEdge(a); 1929 } 1930 break; 1931 case R.styleable.View_scrollbarStyle: 1932 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 1933 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 1934 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 1935 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 1936 } 1937 break; 1938 case R.styleable.View_isScrollContainer: 1939 setScrollContainer = true; 1940 if (a.getBoolean(attr, false)) { 1941 setScrollContainer(true); 1942 } 1943 break; 1944 case com.android.internal.R.styleable.View_keepScreenOn: 1945 if (a.getBoolean(attr, false)) { 1946 viewFlagValues |= KEEP_SCREEN_ON; 1947 viewFlagMasks |= KEEP_SCREEN_ON; 1948 } 1949 break; 1950 case R.styleable.View_nextFocusLeft: 1951 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 1952 break; 1953 case R.styleable.View_nextFocusRight: 1954 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 1955 break; 1956 case R.styleable.View_nextFocusUp: 1957 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 1958 break; 1959 case R.styleable.View_nextFocusDown: 1960 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 1961 break; 1962 case R.styleable.View_minWidth: 1963 mMinWidth = a.getDimensionPixelSize(attr, 0); 1964 break; 1965 case R.styleable.View_minHeight: 1966 mMinHeight = a.getDimensionPixelSize(attr, 0); 1967 break; 1968 case R.styleable.View_onClick: 1969 final String handlerName = a.getString(attr); 1970 if (handlerName != null) { 1971 setOnClickListener(new OnClickListener() { 1972 private Method mHandler; 1973 1974 public void onClick(View v) { 1975 if (mHandler == null) { 1976 try { 1977 mHandler = getContext().getClass().getMethod(handlerName, 1978 View.class); 1979 } catch (NoSuchMethodException e) { 1980 throw new IllegalStateException("Could not find a method " + 1981 handlerName + "(View) in the activity", e); 1982 } 1983 } 1984 1985 try { 1986 mHandler.invoke(getContext(), View.this); 1987 } catch (IllegalAccessException e) { 1988 throw new IllegalStateException("Could not execute non " 1989 + "public method of the activity", e); 1990 } catch (InvocationTargetException e) { 1991 throw new IllegalStateException("Could not execute " 1992 + "method of the activity", e); 1993 } 1994 } 1995 }); 1996 } 1997 break; 1998 } 1999 } 2000 2001 if (background != null) { 2002 setBackgroundDrawable(background); 2003 } 2004 2005 if (padding >= 0) { 2006 leftPadding = padding; 2007 topPadding = padding; 2008 rightPadding = padding; 2009 bottomPadding = padding; 2010 } 2011 2012 // If the user specified the padding (either with android:padding or 2013 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 2014 // use the default padding or the padding from the background drawable 2015 // (stored at this point in mPadding*) 2016 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 2017 topPadding >= 0 ? topPadding : mPaddingTop, 2018 rightPadding >= 0 ? rightPadding : mPaddingRight, 2019 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 2020 2021 if (viewFlagMasks != 0) { 2022 setFlags(viewFlagValues, viewFlagMasks); 2023 } 2024 2025 // Needs to be called after mViewFlags is set 2026 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2027 recomputePadding(); 2028 } 2029 2030 if (x != 0 || y != 0) { 2031 scrollTo(x, y); 2032 } 2033 2034 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 2035 setScrollContainer(true); 2036 } 2037 2038 computeOpaqueFlags(); 2039 2040 a.recycle(); 2041 } 2042 2043 /** 2044 * Non-public constructor for use in testing 2045 */ 2046 View() { 2047 } 2048 2049 @Override 2050 protected void finalize() throws Throwable { 2051 super.finalize(); 2052 --sInstanceCount; 2053 } 2054 2055 /** 2056 * <p> 2057 * Initializes the fading edges from a given set of styled attributes. This 2058 * method should be called by subclasses that need fading edges and when an 2059 * instance of these subclasses is created programmatically rather than 2060 * being inflated from XML. This method is automatically called when the XML 2061 * is inflated. 2062 * </p> 2063 * 2064 * @param a the styled attributes set to initialize the fading edges from 2065 */ 2066 protected void initializeFadingEdge(TypedArray a) { 2067 initScrollCache(); 2068 2069 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 2070 R.styleable.View_fadingEdgeLength, 2071 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 2072 } 2073 2074 /** 2075 * Returns the size of the vertical faded edges used to indicate that more 2076 * content in this view is visible. 2077 * 2078 * @return The size in pixels of the vertical faded edge or 0 if vertical 2079 * faded edges are not enabled for this view. 2080 * @attr ref android.R.styleable#View_fadingEdgeLength 2081 */ 2082 public int getVerticalFadingEdgeLength() { 2083 if (isVerticalFadingEdgeEnabled()) { 2084 ScrollabilityCache cache = mScrollCache; 2085 if (cache != null) { 2086 return cache.fadingEdgeLength; 2087 } 2088 } 2089 return 0; 2090 } 2091 2092 /** 2093 * Set the size of the faded edge used to indicate that more content in this 2094 * view is available. Will not change whether the fading edge is enabled; use 2095 * {@link #setVerticalFadingEdgeEnabled} or {@link #setHorizontalFadingEdgeEnabled} 2096 * to enable the fading edge for the vertical or horizontal fading edges. 2097 * 2098 * @param length The size in pixels of the faded edge used to indicate that more 2099 * content in this view is visible. 2100 */ 2101 public void setFadingEdgeLength(int length) { 2102 initScrollCache(); 2103 mScrollCache.fadingEdgeLength = length; 2104 } 2105 2106 /** 2107 * Returns the size of the horizontal faded edges used to indicate that more 2108 * content in this view is visible. 2109 * 2110 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 2111 * faded edges are not enabled for this view. 2112 * @attr ref android.R.styleable#View_fadingEdgeLength 2113 */ 2114 public int getHorizontalFadingEdgeLength() { 2115 if (isHorizontalFadingEdgeEnabled()) { 2116 ScrollabilityCache cache = mScrollCache; 2117 if (cache != null) { 2118 return cache.fadingEdgeLength; 2119 } 2120 } 2121 return 0; 2122 } 2123 2124 /** 2125 * Returns the width of the vertical scrollbar. 2126 * 2127 * @return The width in pixels of the vertical scrollbar or 0 if there 2128 * is no vertical scrollbar. 2129 */ 2130 public int getVerticalScrollbarWidth() { 2131 ScrollabilityCache cache = mScrollCache; 2132 if (cache != null) { 2133 ScrollBarDrawable scrollBar = cache.scrollBar; 2134 if (scrollBar != null) { 2135 int size = scrollBar.getSize(true); 2136 if (size <= 0) { 2137 size = cache.scrollBarSize; 2138 } 2139 return size; 2140 } 2141 return 0; 2142 } 2143 return 0; 2144 } 2145 2146 /** 2147 * Returns the height of the horizontal scrollbar. 2148 * 2149 * @return The height in pixels of the horizontal scrollbar or 0 if 2150 * there is no horizontal scrollbar. 2151 */ 2152 protected int getHorizontalScrollbarHeight() { 2153 ScrollabilityCache cache = mScrollCache; 2154 if (cache != null) { 2155 ScrollBarDrawable scrollBar = cache.scrollBar; 2156 if (scrollBar != null) { 2157 int size = scrollBar.getSize(false); 2158 if (size <= 0) { 2159 size = cache.scrollBarSize; 2160 } 2161 return size; 2162 } 2163 return 0; 2164 } 2165 return 0; 2166 } 2167 2168 /** 2169 * <p> 2170 * Initializes the scrollbars from a given set of styled attributes. This 2171 * method should be called by subclasses that need scrollbars and when an 2172 * instance of these subclasses is created programmatically rather than 2173 * being inflated from XML. This method is automatically called when the XML 2174 * is inflated. 2175 * </p> 2176 * 2177 * @param a the styled attributes set to initialize the scrollbars from 2178 */ 2179 protected void initializeScrollbars(TypedArray a) { 2180 initScrollCache(); 2181 2182 if (mScrollCache.scrollBar == null) { 2183 mScrollCache.scrollBar = new ScrollBarDrawable(); 2184 } 2185 2186 final ScrollabilityCache scrollabilityCache = mScrollCache; 2187 2188 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 2189 com.android.internal.R.styleable.View_scrollbarSize, 2190 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 2191 2192 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 2193 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 2194 2195 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 2196 if (thumb != null) { 2197 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 2198 } 2199 2200 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 2201 false); 2202 if (alwaysDraw) { 2203 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 2204 } 2205 2206 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 2207 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 2208 2209 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 2210 if (thumb != null) { 2211 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 2212 } 2213 2214 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 2215 false); 2216 if (alwaysDraw) { 2217 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 2218 } 2219 2220 // Re-apply user/background padding so that scrollbar(s) get added 2221 recomputePadding(); 2222 } 2223 2224 /** 2225 * <p> 2226 * Initalizes the scrollability cache if necessary. 2227 * </p> 2228 */ 2229 private void initScrollCache() { 2230 if (mScrollCache == null) { 2231 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext)); 2232 } 2233 } 2234 2235 /** 2236 * Register a callback to be invoked when focus of this view changed. 2237 * 2238 * @param l The callback that will run. 2239 */ 2240 public void setOnFocusChangeListener(OnFocusChangeListener l) { 2241 mOnFocusChangeListener = l; 2242 } 2243 2244 /** 2245 * Returns the focus-change callback registered for this view. 2246 * 2247 * @return The callback, or null if one is not registered. 2248 */ 2249 public OnFocusChangeListener getOnFocusChangeListener() { 2250 return mOnFocusChangeListener; 2251 } 2252 2253 /** 2254 * Register a callback to be invoked when this view is clicked. If this view is not 2255 * clickable, it becomes clickable. 2256 * 2257 * @param l The callback that will run 2258 * 2259 * @see #setClickable(boolean) 2260 */ 2261 public void setOnClickListener(OnClickListener l) { 2262 if (!isClickable()) { 2263 setClickable(true); 2264 } 2265 mOnClickListener = l; 2266 } 2267 2268 /** 2269 * Register a callback to be invoked when this view is clicked and held. If this view is not 2270 * long clickable, it becomes long clickable. 2271 * 2272 * @param l The callback that will run 2273 * 2274 * @see #setLongClickable(boolean) 2275 */ 2276 public void setOnLongClickListener(OnLongClickListener l) { 2277 if (!isLongClickable()) { 2278 setLongClickable(true); 2279 } 2280 mOnLongClickListener = l; 2281 } 2282 2283 /** 2284 * Register a callback to be invoked when the context menu for this view is 2285 * being built. If this view is not long clickable, it becomes long clickable. 2286 * 2287 * @param l The callback that will run 2288 * 2289 */ 2290 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 2291 if (!isLongClickable()) { 2292 setLongClickable(true); 2293 } 2294 mOnCreateContextMenuListener = l; 2295 } 2296 2297 /** 2298 * Call this view's OnClickListener, if it is defined. 2299 * 2300 * @return True there was an assigned OnClickListener that was called, false 2301 * otherwise is returned. 2302 */ 2303 public boolean performClick() { 2304 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 2305 2306 if (mOnClickListener != null) { 2307 playSoundEffect(SoundEffectConstants.CLICK); 2308 mOnClickListener.onClick(this); 2309 return true; 2310 } 2311 2312 return false; 2313 } 2314 2315 /** 2316 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu 2317 * if the OnLongClickListener did not consume the event. 2318 * 2319 * @return True there was an assigned OnLongClickListener that was called, false 2320 * otherwise is returned. 2321 */ 2322 public boolean performLongClick() { 2323 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 2324 2325 boolean handled = false; 2326 if (mOnLongClickListener != null) { 2327 handled = mOnLongClickListener.onLongClick(View.this); 2328 } 2329 if (!handled) { 2330 handled = showContextMenu(); 2331 } 2332 if (handled) { 2333 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 2334 } 2335 return handled; 2336 } 2337 2338 /** 2339 * Bring up the context menu for this view. 2340 * 2341 * @return Whether a context menu was displayed. 2342 */ 2343 public boolean showContextMenu() { 2344 return getParent().showContextMenuForChild(this); 2345 } 2346 2347 /** 2348 * Register a callback to be invoked when a key is pressed in this view. 2349 * @param l the key listener to attach to this view 2350 */ 2351 public void setOnKeyListener(OnKeyListener l) { 2352 mOnKeyListener = l; 2353 } 2354 2355 /** 2356 * Register a callback to be invoked when a touch event is sent to this view. 2357 * @param l the touch listener to attach to this view 2358 */ 2359 public void setOnTouchListener(OnTouchListener l) { 2360 mOnTouchListener = l; 2361 } 2362 2363 /** 2364 * Give this view focus. This will cause {@link #onFocusChanged} to be called. 2365 * 2366 * Note: this does not check whether this {@link View} should get focus, it just 2367 * gives it focus no matter what. It should only be called internally by framework 2368 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 2369 * 2370 * @param direction values are View.FOCUS_UP, View.FOCUS_DOWN, 2371 * View.FOCUS_LEFT or View.FOCUS_RIGHT. This is the direction which 2372 * focus moved when requestFocus() is called. It may not always 2373 * apply, in which case use the default View.FOCUS_DOWN. 2374 * @param previouslyFocusedRect The rectangle of the view that had focus 2375 * prior in this View's coordinate system. 2376 */ 2377 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 2378 if (DBG) { 2379 System.out.println(this + " requestFocus()"); 2380 } 2381 2382 if ((mPrivateFlags & FOCUSED) == 0) { 2383 mPrivateFlags |= FOCUSED; 2384 2385 if (mParent != null) { 2386 mParent.requestChildFocus(this, this); 2387 } 2388 2389 onFocusChanged(true, direction, previouslyFocusedRect); 2390 refreshDrawableState(); 2391 } 2392 } 2393 2394 /** 2395 * Request that a rectangle of this view be visible on the screen, 2396 * scrolling if necessary just enough. 2397 * 2398 * <p>A View should call this if it maintains some notion of which part 2399 * of its content is interesting. For example, a text editing view 2400 * should call this when its cursor moves. 2401 * 2402 * @param rectangle The rectangle. 2403 * @return Whether any parent scrolled. 2404 */ 2405 public boolean requestRectangleOnScreen(Rect rectangle) { 2406 return requestRectangleOnScreen(rectangle, false); 2407 } 2408 2409 /** 2410 * Request that a rectangle of this view be visible on the screen, 2411 * scrolling if necessary just enough. 2412 * 2413 * <p>A View should call this if it maintains some notion of which part 2414 * of its content is interesting. For example, a text editing view 2415 * should call this when its cursor moves. 2416 * 2417 * <p>When <code>immediate</code> is set to true, scrolling will not be 2418 * animated. 2419 * 2420 * @param rectangle The rectangle. 2421 * @param immediate True to forbid animated scrolling, false otherwise 2422 * @return Whether any parent scrolled. 2423 */ 2424 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 2425 View child = this; 2426 ViewParent parent = mParent; 2427 boolean scrolled = false; 2428 while (parent != null) { 2429 scrolled |= parent.requestChildRectangleOnScreen(child, 2430 rectangle, immediate); 2431 2432 // offset rect so next call has the rectangle in the 2433 // coordinate system of its direct child. 2434 rectangle.offset(child.getLeft(), child.getTop()); 2435 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 2436 2437 if (!(parent instanceof View)) { 2438 break; 2439 } 2440 2441 child = (View) parent; 2442 parent = child.getParent(); 2443 } 2444 return scrolled; 2445 } 2446 2447 /** 2448 * Called when this view wants to give up focus. This will cause 2449 * {@link #onFocusChanged} to be called. 2450 */ 2451 public void clearFocus() { 2452 if (DBG) { 2453 System.out.println(this + " clearFocus()"); 2454 } 2455 2456 if ((mPrivateFlags & FOCUSED) != 0) { 2457 mPrivateFlags &= ~FOCUSED; 2458 2459 if (mParent != null) { 2460 mParent.clearChildFocus(this); 2461 } 2462 2463 onFocusChanged(false, 0, null); 2464 refreshDrawableState(); 2465 } 2466 } 2467 2468 /** 2469 * Called to clear the focus of a view that is about to be removed. 2470 * Doesn't call clearChildFocus, which prevents this view from taking 2471 * focus again before it has been removed from the parent 2472 */ 2473 void clearFocusForRemoval() { 2474 if ((mPrivateFlags & FOCUSED) != 0) { 2475 mPrivateFlags &= ~FOCUSED; 2476 2477 onFocusChanged(false, 0, null); 2478 refreshDrawableState(); 2479 } 2480 } 2481 2482 /** 2483 * Called internally by the view system when a new view is getting focus. 2484 * This is what clears the old focus. 2485 */ 2486 void unFocus() { 2487 if (DBG) { 2488 System.out.println(this + " unFocus()"); 2489 } 2490 2491 if ((mPrivateFlags & FOCUSED) != 0) { 2492 mPrivateFlags &= ~FOCUSED; 2493 2494 onFocusChanged(false, 0, null); 2495 refreshDrawableState(); 2496 } 2497 } 2498 2499 /** 2500 * Returns true if this view has focus iteself, or is the ancestor of the 2501 * view that has focus. 2502 * 2503 * @return True if this view has or contains focus, false otherwise. 2504 */ 2505 @ViewDebug.ExportedProperty 2506 public boolean hasFocus() { 2507 return (mPrivateFlags & FOCUSED) != 0; 2508 } 2509 2510 /** 2511 * Returns true if this view is focusable or if it contains a reachable View 2512 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 2513 * is a View whose parents do not block descendants focus. 2514 * 2515 * Only {@link #VISIBLE} views are considered focusable. 2516 * 2517 * @return True if the view is focusable or if the view contains a focusable 2518 * View, false otherwise. 2519 * 2520 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 2521 */ 2522 public boolean hasFocusable() { 2523 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 2524 } 2525 2526 /** 2527 * Called by the view system when the focus state of this view changes. 2528 * When the focus change event is caused by directional navigation, direction 2529 * and previouslyFocusedRect provide insight into where the focus is coming from. 2530 * When overriding, be sure to call up through to the super class so that 2531 * the standard focus handling will occur. 2532 * 2533 * @param gainFocus True if the View has focus; false otherwise. 2534 * @param direction The direction focus has moved when requestFocus() 2535 * is called to give this view focus. Values are 2536 * View.FOCUS_UP, View.FOCUS_DOWN, View.FOCUS_LEFT or 2537 * View.FOCUS_RIGHT. It may not always apply, in which 2538 * case use the default. 2539 * @param previouslyFocusedRect The rectangle, in this view's coordinate 2540 * system, of the previously focused view. If applicable, this will be 2541 * passed in as finer grained information about where the focus is coming 2542 * from (in addition to direction). Will be <code>null</code> otherwise. 2543 */ 2544 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 2545 if (gainFocus) { 2546 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 2547 } 2548 2549 InputMethodManager imm = InputMethodManager.peekInstance(); 2550 if (!gainFocus) { 2551 if (isPressed()) { 2552 setPressed(false); 2553 } 2554 if (imm != null && mAttachInfo != null 2555 && mAttachInfo.mHasWindowFocus) { 2556 imm.focusOut(this); 2557 } 2558 onFocusLost(); 2559 } else if (imm != null && mAttachInfo != null 2560 && mAttachInfo.mHasWindowFocus) { 2561 imm.focusIn(this); 2562 } 2563 2564 invalidate(); 2565 if (mOnFocusChangeListener != null) { 2566 mOnFocusChangeListener.onFocusChange(this, gainFocus); 2567 } 2568 } 2569 2570 /** 2571 * {@inheritDoc} 2572 */ 2573 public void sendAccessibilityEvent(int eventType) { 2574 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 2575 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 2576 } 2577 } 2578 2579 /** 2580 * {@inheritDoc} 2581 */ 2582 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 2583 event.setClassName(getClass().getName()); 2584 event.setPackageName(getContext().getPackageName()); 2585 event.setEnabled(isEnabled()); 2586 event.setContentDescription(mContentDescription); 2587 2588 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 2589 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 2590 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 2591 event.setItemCount(focusablesTempList.size()); 2592 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 2593 focusablesTempList.clear(); 2594 } 2595 2596 dispatchPopulateAccessibilityEvent(event); 2597 2598 AccessibilityManager.getInstance(mContext).sendAccessibilityEvent(event); 2599 } 2600 2601 /** 2602 * Dispatches an {@link AccessibilityEvent} to the {@link View} children 2603 * to be populated. 2604 * 2605 * @param event The event. 2606 * 2607 * @return True if the event population was completed. 2608 */ 2609 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 2610 return false; 2611 } 2612 2613 /** 2614 * Gets the {@link View} description. It briefly describes the view and is 2615 * primarily used for accessibility support. Set this property to enable 2616 * better accessibility support for your application. This is especially 2617 * true for views that do not have textual representation (For example, 2618 * ImageButton). 2619 * 2620 * @return The content descriptiopn. 2621 * 2622 * @attr ref android.R.styleable#View_contentDescription 2623 */ 2624 public CharSequence getContentDescription() { 2625 return mContentDescription; 2626 } 2627 2628 /** 2629 * Sets the {@link View} description. It briefly describes the view and is 2630 * primarily used for accessibility support. Set this property to enable 2631 * better accessibility support for your application. This is especially 2632 * true for views that do not have textual representation (For example, 2633 * ImageButton). 2634 * 2635 * @param contentDescription The content description. 2636 * 2637 * @attr ref android.R.styleable#View_contentDescription 2638 */ 2639 public void setContentDescription(CharSequence contentDescription) { 2640 mContentDescription = contentDescription; 2641 } 2642 2643 /** 2644 * Invoked whenever this view loses focus, either by losing window focus or by losing 2645 * focus within its window. This method can be used to clear any state tied to the 2646 * focus. For instance, if a button is held pressed with the trackball and the window 2647 * loses focus, this method can be used to cancel the press. 2648 * 2649 * Subclasses of View overriding this method should always call super.onFocusLost(). 2650 * 2651 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 2652 * @see #onWindowFocusChanged(boolean) 2653 * 2654 * @hide pending API council approval 2655 */ 2656 protected void onFocusLost() { 2657 resetPressedState(); 2658 } 2659 2660 private void resetPressedState() { 2661 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 2662 return; 2663 } 2664 2665 if (isPressed()) { 2666 setPressed(false); 2667 2668 if (!mHasPerformedLongPress) { 2669 if (mPendingCheckForLongPress != null) { 2670 removeCallbacks(mPendingCheckForLongPress); 2671 } 2672 } 2673 } 2674 } 2675 2676 /** 2677 * Returns true if this view has focus 2678 * 2679 * @return True if this view has focus, false otherwise. 2680 */ 2681 @ViewDebug.ExportedProperty 2682 public boolean isFocused() { 2683 return (mPrivateFlags & FOCUSED) != 0; 2684 } 2685 2686 /** 2687 * Find the view in the hierarchy rooted at this view that currently has 2688 * focus. 2689 * 2690 * @return The view that currently has focus, or null if no focused view can 2691 * be found. 2692 */ 2693 public View findFocus() { 2694 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 2695 } 2696 2697 /** 2698 * Change whether this view is one of the set of scrollable containers in 2699 * its window. This will be used to determine whether the window can 2700 * resize or must pan when a soft input area is open -- scrollable 2701 * containers allow the window to use resize mode since the container 2702 * will appropriately shrink. 2703 */ 2704 public void setScrollContainer(boolean isScrollContainer) { 2705 if (isScrollContainer) { 2706 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 2707 mAttachInfo.mScrollContainers.add(this); 2708 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 2709 } 2710 mPrivateFlags |= SCROLL_CONTAINER; 2711 } else { 2712 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 2713 mAttachInfo.mScrollContainers.remove(this); 2714 } 2715 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 2716 } 2717 } 2718 2719 /** 2720 * Returns the quality of the drawing cache. 2721 * 2722 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 2723 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 2724 * 2725 * @see #setDrawingCacheQuality(int) 2726 * @see #setDrawingCacheEnabled(boolean) 2727 * @see #isDrawingCacheEnabled() 2728 * 2729 * @attr ref android.R.styleable#View_drawingCacheQuality 2730 */ 2731 public int getDrawingCacheQuality() { 2732 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 2733 } 2734 2735 /** 2736 * Set the drawing cache quality of this view. This value is used only when the 2737 * drawing cache is enabled 2738 * 2739 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 2740 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 2741 * 2742 * @see #getDrawingCacheQuality() 2743 * @see #setDrawingCacheEnabled(boolean) 2744 * @see #isDrawingCacheEnabled() 2745 * 2746 * @attr ref android.R.styleable#View_drawingCacheQuality 2747 */ 2748 public void setDrawingCacheQuality(int quality) { 2749 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 2750 } 2751 2752 /** 2753 * Returns whether the screen should remain on, corresponding to the current 2754 * value of {@link #KEEP_SCREEN_ON}. 2755 * 2756 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 2757 * 2758 * @see #setKeepScreenOn(boolean) 2759 * 2760 * @attr ref android.R.styleable#View_keepScreenOn 2761 */ 2762 public boolean getKeepScreenOn() { 2763 return (mViewFlags & KEEP_SCREEN_ON) != 0; 2764 } 2765 2766 /** 2767 * Controls whether the screen should remain on, modifying the 2768 * value of {@link #KEEP_SCREEN_ON}. 2769 * 2770 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 2771 * 2772 * @see #getKeepScreenOn() 2773 * 2774 * @attr ref android.R.styleable#View_keepScreenOn 2775 */ 2776 public void setKeepScreenOn(boolean keepScreenOn) { 2777 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 2778 } 2779 2780 /** 2781 * @return The user specified next focus ID. 2782 * 2783 * @attr ref android.R.styleable#View_nextFocusLeft 2784 */ 2785 public int getNextFocusLeftId() { 2786 return mNextFocusLeftId; 2787 } 2788 2789 /** 2790 * Set the id of the view to use for the next focus 2791 * 2792 * @param nextFocusLeftId 2793 * 2794 * @attr ref android.R.styleable#View_nextFocusLeft 2795 */ 2796 public void setNextFocusLeftId(int nextFocusLeftId) { 2797 mNextFocusLeftId = nextFocusLeftId; 2798 } 2799 2800 /** 2801 * @return The user specified next focus ID. 2802 * 2803 * @attr ref android.R.styleable#View_nextFocusRight 2804 */ 2805 public int getNextFocusRightId() { 2806 return mNextFocusRightId; 2807 } 2808 2809 /** 2810 * Set the id of the view to use for the next focus 2811 * 2812 * @param nextFocusRightId 2813 * 2814 * @attr ref android.R.styleable#View_nextFocusRight 2815 */ 2816 public void setNextFocusRightId(int nextFocusRightId) { 2817 mNextFocusRightId = nextFocusRightId; 2818 } 2819 2820 /** 2821 * @return The user specified next focus ID. 2822 * 2823 * @attr ref android.R.styleable#View_nextFocusUp 2824 */ 2825 public int getNextFocusUpId() { 2826 return mNextFocusUpId; 2827 } 2828 2829 /** 2830 * Set the id of the view to use for the next focus 2831 * 2832 * @param nextFocusUpId 2833 * 2834 * @attr ref android.R.styleable#View_nextFocusUp 2835 */ 2836 public void setNextFocusUpId(int nextFocusUpId) { 2837 mNextFocusUpId = nextFocusUpId; 2838 } 2839 2840 /** 2841 * @return The user specified next focus ID. 2842 * 2843 * @attr ref android.R.styleable#View_nextFocusDown 2844 */ 2845 public int getNextFocusDownId() { 2846 return mNextFocusDownId; 2847 } 2848 2849 /** 2850 * Set the id of the view to use for the next focus 2851 * 2852 * @param nextFocusDownId 2853 * 2854 * @attr ref android.R.styleable#View_nextFocusDown 2855 */ 2856 public void setNextFocusDownId(int nextFocusDownId) { 2857 mNextFocusDownId = nextFocusDownId; 2858 } 2859 2860 /** 2861 * Returns the visibility of this view and all of its ancestors 2862 * 2863 * @return True if this view and all of its ancestors are {@link #VISIBLE} 2864 */ 2865 public boolean isShown() { 2866 View current = this; 2867 //noinspection ConstantConditions 2868 do { 2869 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 2870 return false; 2871 } 2872 ViewParent parent = current.mParent; 2873 if (parent == null) { 2874 return false; // We are not attached to the view root 2875 } 2876 if (!(parent instanceof View)) { 2877 return true; 2878 } 2879 current = (View) parent; 2880 } while (current != null); 2881 2882 return false; 2883 } 2884 2885 /** 2886 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 2887 * is set 2888 * 2889 * @param insets Insets for system windows 2890 * 2891 * @return True if this view applied the insets, false otherwise 2892 */ 2893 protected boolean fitSystemWindows(Rect insets) { 2894 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 2895 mPaddingLeft = insets.left; 2896 mPaddingTop = insets.top; 2897 mPaddingRight = insets.right; 2898 mPaddingBottom = insets.bottom; 2899 requestLayout(); 2900 return true; 2901 } 2902 return false; 2903 } 2904 2905 /** 2906 * Returns the visibility status for this view. 2907 * 2908 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 2909 * @attr ref android.R.styleable#View_visibility 2910 */ 2911 @ViewDebug.ExportedProperty(mapping = { 2912 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 2913 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 2914 @ViewDebug.IntToString(from = GONE, to = "GONE") 2915 }) 2916 public int getVisibility() { 2917 return mViewFlags & VISIBILITY_MASK; 2918 } 2919 2920 /** 2921 * Set the enabled state of this view. 2922 * 2923 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 2924 * @attr ref android.R.styleable#View_visibility 2925 */ 2926 @RemotableViewMethod 2927 public void setVisibility(int visibility) { 2928 setFlags(visibility, VISIBILITY_MASK); 2929 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 2930 } 2931 2932 /** 2933 * Returns the enabled status for this view. The interpretation of the 2934 * enabled state varies by subclass. 2935 * 2936 * @return True if this view is enabled, false otherwise. 2937 */ 2938 @ViewDebug.ExportedProperty 2939 public boolean isEnabled() { 2940 return (mViewFlags & ENABLED_MASK) == ENABLED; 2941 } 2942 2943 /** 2944 * Set the enabled state of this view. The interpretation of the enabled 2945 * state varies by subclass. 2946 * 2947 * @param enabled True if this view is enabled, false otherwise. 2948 */ 2949 public void setEnabled(boolean enabled) { 2950 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 2951 2952 /* 2953 * The View most likely has to change its appearance, so refresh 2954 * the drawable state. 2955 */ 2956 refreshDrawableState(); 2957 2958 // Invalidate too, since the default behavior for views is to be 2959 // be drawn at 50% alpha rather than to change the drawable. 2960 invalidate(); 2961 } 2962 2963 /** 2964 * Set whether this view can receive the focus. 2965 * 2966 * Setting this to false will also ensure that this view is not focusable 2967 * in touch mode. 2968 * 2969 * @param focusable If true, this view can receive the focus. 2970 * 2971 * @see #setFocusableInTouchMode(boolean) 2972 * @attr ref android.R.styleable#View_focusable 2973 */ 2974 public void setFocusable(boolean focusable) { 2975 if (!focusable) { 2976 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 2977 } 2978 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 2979 } 2980 2981 /** 2982 * Set whether this view can receive focus while in touch mode. 2983 * 2984 * Setting this to true will also ensure that this view is focusable. 2985 * 2986 * @param focusableInTouchMode If true, this view can receive the focus while 2987 * in touch mode. 2988 * 2989 * @see #setFocusable(boolean) 2990 * @attr ref android.R.styleable#View_focusableInTouchMode 2991 */ 2992 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 2993 // Focusable in touch mode should always be set before the focusable flag 2994 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 2995 // which, in touch mode, will not successfully request focus on this view 2996 // because the focusable in touch mode flag is not set 2997 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 2998 if (focusableInTouchMode) { 2999 setFlags(FOCUSABLE, FOCUSABLE_MASK); 3000 } 3001 } 3002 3003 /** 3004 * Set whether this view should have sound effects enabled for events such as 3005 * clicking and touching. 3006 * 3007 * <p>You may wish to disable sound effects for a view if you already play sounds, 3008 * for instance, a dial key that plays dtmf tones. 3009 * 3010 * @param soundEffectsEnabled whether sound effects are enabled for this view. 3011 * @see #isSoundEffectsEnabled() 3012 * @see #playSoundEffect(int) 3013 * @attr ref android.R.styleable#View_soundEffectsEnabled 3014 */ 3015 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 3016 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 3017 } 3018 3019 /** 3020 * @return whether this view should have sound effects enabled for events such as 3021 * clicking and touching. 3022 * 3023 * @see #setSoundEffectsEnabled(boolean) 3024 * @see #playSoundEffect(int) 3025 * @attr ref android.R.styleable#View_soundEffectsEnabled 3026 */ 3027 @ViewDebug.ExportedProperty 3028 public boolean isSoundEffectsEnabled() { 3029 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 3030 } 3031 3032 /** 3033 * Set whether this view should have haptic feedback for events such as 3034 * long presses. 3035 * 3036 * <p>You may wish to disable haptic feedback if your view already controls 3037 * its own haptic feedback. 3038 * 3039 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 3040 * @see #isHapticFeedbackEnabled() 3041 * @see #performHapticFeedback(int) 3042 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3043 */ 3044 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 3045 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 3046 } 3047 3048 /** 3049 * @return whether this view should have haptic feedback enabled for events 3050 * long presses. 3051 * 3052 * @see #setHapticFeedbackEnabled(boolean) 3053 * @see #performHapticFeedback(int) 3054 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3055 */ 3056 @ViewDebug.ExportedProperty 3057 public boolean isHapticFeedbackEnabled() { 3058 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 3059 } 3060 3061 /** 3062 * If this view doesn't do any drawing on its own, set this flag to 3063 * allow further optimizations. By default, this flag is not set on 3064 * View, but could be set on some View subclasses such as ViewGroup. 3065 * 3066 * Typically, if you override {@link #onDraw} you should clear this flag. 3067 * 3068 * @param willNotDraw whether or not this View draw on its own 3069 */ 3070 public void setWillNotDraw(boolean willNotDraw) { 3071 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 3072 } 3073 3074 /** 3075 * Returns whether or not this View draws on its own. 3076 * 3077 * @return true if this view has nothing to draw, false otherwise 3078 */ 3079 @ViewDebug.ExportedProperty 3080 public boolean willNotDraw() { 3081 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 3082 } 3083 3084 /** 3085 * When a View's drawing cache is enabled, drawing is redirected to an 3086 * offscreen bitmap. Some views, like an ImageView, must be able to 3087 * bypass this mechanism if they already draw a single bitmap, to avoid 3088 * unnecessary usage of the memory. 3089 * 3090 * @param willNotCacheDrawing true if this view does not cache its 3091 * drawing, false otherwise 3092 */ 3093 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 3094 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 3095 } 3096 3097 /** 3098 * Returns whether or not this View can cache its drawing or not. 3099 * 3100 * @return true if this view does not cache its drawing, false otherwise 3101 */ 3102 @ViewDebug.ExportedProperty 3103 public boolean willNotCacheDrawing() { 3104 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 3105 } 3106 3107 /** 3108 * Indicates whether this view reacts to click events or not. 3109 * 3110 * @return true if the view is clickable, false otherwise 3111 * 3112 * @see #setClickable(boolean) 3113 * @attr ref android.R.styleable#View_clickable 3114 */ 3115 @ViewDebug.ExportedProperty 3116 public boolean isClickable() { 3117 return (mViewFlags & CLICKABLE) == CLICKABLE; 3118 } 3119 3120 /** 3121 * Enables or disables click events for this view. When a view 3122 * is clickable it will change its state to "pressed" on every click. 3123 * Subclasses should set the view clickable to visually react to 3124 * user's clicks. 3125 * 3126 * @param clickable true to make the view clickable, false otherwise 3127 * 3128 * @see #isClickable() 3129 * @attr ref android.R.styleable#View_clickable 3130 */ 3131 public void setClickable(boolean clickable) { 3132 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 3133 } 3134 3135 /** 3136 * Indicates whether this view reacts to long click events or not. 3137 * 3138 * @return true if the view is long clickable, false otherwise 3139 * 3140 * @see #setLongClickable(boolean) 3141 * @attr ref android.R.styleable#View_longClickable 3142 */ 3143 public boolean isLongClickable() { 3144 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 3145 } 3146 3147 /** 3148 * Enables or disables long click events for this view. When a view is long 3149 * clickable it reacts to the user holding down the button for a longer 3150 * duration than a tap. This event can either launch the listener or a 3151 * context menu. 3152 * 3153 * @param longClickable true to make the view long clickable, false otherwise 3154 * @see #isLongClickable() 3155 * @attr ref android.R.styleable#View_longClickable 3156 */ 3157 public void setLongClickable(boolean longClickable) { 3158 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 3159 } 3160 3161 /** 3162 * Sets the pressed that for this view. 3163 * 3164 * @see #isClickable() 3165 * @see #setClickable(boolean) 3166 * 3167 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 3168 * the View's internal state from a previously set "pressed" state. 3169 */ 3170 public void setPressed(boolean pressed) { 3171 if (pressed) { 3172 mPrivateFlags |= PRESSED; 3173 } else { 3174 mPrivateFlags &= ~PRESSED; 3175 } 3176 refreshDrawableState(); 3177 dispatchSetPressed(pressed); 3178 } 3179 3180 /** 3181 * Dispatch setPressed to all of this View's children. 3182 * 3183 * @see #setPressed(boolean) 3184 * 3185 * @param pressed The new pressed state 3186 */ 3187 protected void dispatchSetPressed(boolean pressed) { 3188 } 3189 3190 /** 3191 * Indicates whether the view is currently in pressed state. Unless 3192 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 3193 * the pressed state. 3194 * 3195 * @see #setPressed 3196 * @see #isClickable() 3197 * @see #setClickable(boolean) 3198 * 3199 * @return true if the view is currently pressed, false otherwise 3200 */ 3201 public boolean isPressed() { 3202 return (mPrivateFlags & PRESSED) == PRESSED; 3203 } 3204 3205 /** 3206 * Indicates whether this view will save its state (that is, 3207 * whether its {@link #onSaveInstanceState} method will be called). 3208 * 3209 * @return Returns true if the view state saving is enabled, else false. 3210 * 3211 * @see #setSaveEnabled(boolean) 3212 * @attr ref android.R.styleable#View_saveEnabled 3213 */ 3214 public boolean isSaveEnabled() { 3215 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 3216 } 3217 3218 /** 3219 * Controls whether the saving of this view's state is 3220 * enabled (that is, whether its {@link #onSaveInstanceState} method 3221 * will be called). Note that even if freezing is enabled, the 3222 * view still must have an id assigned to it (via {@link #setId setId()}) 3223 * for its state to be saved. This flag can only disable the 3224 * saving of this view; any child views may still have their state saved. 3225 * 3226 * @param enabled Set to false to <em>disable</em> state saving, or true 3227 * (the default) to allow it. 3228 * 3229 * @see #isSaveEnabled() 3230 * @see #setId(int) 3231 * @see #onSaveInstanceState() 3232 * @attr ref android.R.styleable#View_saveEnabled 3233 */ 3234 public void setSaveEnabled(boolean enabled) { 3235 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 3236 } 3237 3238 3239 /** 3240 * Returns whether this View is able to take focus. 3241 * 3242 * @return True if this view can take focus, or false otherwise. 3243 * @attr ref android.R.styleable#View_focusable 3244 */ 3245 @ViewDebug.ExportedProperty 3246 public final boolean isFocusable() { 3247 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 3248 } 3249 3250 /** 3251 * When a view is focusable, it may not want to take focus when in touch mode. 3252 * For example, a button would like focus when the user is navigating via a D-pad 3253 * so that the user can click on it, but once the user starts touching the screen, 3254 * the button shouldn't take focus 3255 * @return Whether the view is focusable in touch mode. 3256 * @attr ref android.R.styleable#View_focusableInTouchMode 3257 */ 3258 @ViewDebug.ExportedProperty 3259 public final boolean isFocusableInTouchMode() { 3260 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 3261 } 3262 3263 /** 3264 * Find the nearest view in the specified direction that can take focus. 3265 * This does not actually give focus to that view. 3266 * 3267 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 3268 * 3269 * @return The nearest focusable in the specified direction, or null if none 3270 * can be found. 3271 */ 3272 public View focusSearch(int direction) { 3273 if (mParent != null) { 3274 return mParent.focusSearch(this, direction); 3275 } else { 3276 return null; 3277 } 3278 } 3279 3280 /** 3281 * This method is the last chance for the focused view and its ancestors to 3282 * respond to an arrow key. This is called when the focused view did not 3283 * consume the key internally, nor could the view system find a new view in 3284 * the requested direction to give focus to. 3285 * 3286 * @param focused The currently focused view. 3287 * @param direction The direction focus wants to move. One of FOCUS_UP, 3288 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 3289 * @return True if the this view consumed this unhandled move. 3290 */ 3291 public boolean dispatchUnhandledMove(View focused, int direction) { 3292 return false; 3293 } 3294 3295 /** 3296 * If a user manually specified the next view id for a particular direction, 3297 * use the root to look up the view. Once a view is found, it is cached 3298 * for future lookups. 3299 * @param root The root view of the hierarchy containing this view. 3300 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 3301 * @return The user specified next view, or null if there is none. 3302 */ 3303 View findUserSetNextFocus(View root, int direction) { 3304 switch (direction) { 3305 case FOCUS_LEFT: 3306 if (mNextFocusLeftId == View.NO_ID) return null; 3307 return findViewShouldExist(root, mNextFocusLeftId); 3308 case FOCUS_RIGHT: 3309 if (mNextFocusRightId == View.NO_ID) return null; 3310 return findViewShouldExist(root, mNextFocusRightId); 3311 case FOCUS_UP: 3312 if (mNextFocusUpId == View.NO_ID) return null; 3313 return findViewShouldExist(root, mNextFocusUpId); 3314 case FOCUS_DOWN: 3315 if (mNextFocusDownId == View.NO_ID) return null; 3316 return findViewShouldExist(root, mNextFocusDownId); 3317 } 3318 return null; 3319 } 3320 3321 private static View findViewShouldExist(View root, int childViewId) { 3322 View result = root.findViewById(childViewId); 3323 if (result == null) { 3324 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 3325 + "by user for id " + childViewId); 3326 } 3327 return result; 3328 } 3329 3330 /** 3331 * Find and return all focusable views that are descendants of this view, 3332 * possibly including this view if it is focusable itself. 3333 * 3334 * @param direction The direction of the focus 3335 * @return A list of focusable views 3336 */ 3337 public ArrayList<View> getFocusables(int direction) { 3338 ArrayList<View> result = new ArrayList<View>(24); 3339 addFocusables(result, direction); 3340 return result; 3341 } 3342 3343 /** 3344 * Add any focusable views that are descendants of this view (possibly 3345 * including this view if it is focusable itself) to views. If we are in touch mode, 3346 * only add views that are also focusable in touch mode. 3347 * 3348 * @param views Focusable views found so far 3349 * @param direction The direction of the focus 3350 */ 3351 public void addFocusables(ArrayList<View> views, int direction) { 3352 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 3353 } 3354 3355 /** 3356 * Adds any focusable views that are descendants of this view (possibly 3357 * including this view if it is focusable itself) to views. This method 3358 * adds all focusable views regardless if we are in touch mode or 3359 * only views focusable in touch mode if we are in touch mode depending on 3360 * the focusable mode paramater. 3361 * 3362 * @param views Focusable views found so far or null if all we are interested is 3363 * the number of focusables. 3364 * @param direction The direction of the focus. 3365 * @param focusableMode The type of focusables to be added. 3366 * 3367 * @see #FOCUSABLES_ALL 3368 * @see #FOCUSABLES_TOUCH_MODE 3369 */ 3370 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 3371 if (!isFocusable()) { 3372 return; 3373 } 3374 3375 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 3376 isInTouchMode() && !isFocusableInTouchMode()) { 3377 return; 3378 } 3379 3380 if (views != null) { 3381 views.add(this); 3382 } 3383 } 3384 3385 /** 3386 * Find and return all touchable views that are descendants of this view, 3387 * possibly including this view if it is touchable itself. 3388 * 3389 * @return A list of touchable views 3390 */ 3391 public ArrayList<View> getTouchables() { 3392 ArrayList<View> result = new ArrayList<View>(); 3393 addTouchables(result); 3394 return result; 3395 } 3396 3397 /** 3398 * Add any touchable views that are descendants of this view (possibly 3399 * including this view if it is touchable itself) to views. 3400 * 3401 * @param views Touchable views found so far 3402 */ 3403 public void addTouchables(ArrayList<View> views) { 3404 final int viewFlags = mViewFlags; 3405 3406 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 3407 && (viewFlags & ENABLED_MASK) == ENABLED) { 3408 views.add(this); 3409 } 3410 } 3411 3412 /** 3413 * Call this to try to give focus to a specific view or to one of its 3414 * descendants. 3415 * 3416 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 3417 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 3418 * while the device is in touch mode. 3419 * 3420 * See also {@link #focusSearch}, which is what you call to say that you 3421 * have focus, and you want your parent to look for the next one. 3422 * 3423 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 3424 * {@link #FOCUS_DOWN} and <code>null</code>. 3425 * 3426 * @return Whether this view or one of its descendants actually took focus. 3427 */ 3428 public final boolean requestFocus() { 3429 return requestFocus(View.FOCUS_DOWN); 3430 } 3431 3432 3433 /** 3434 * Call this to try to give focus to a specific view or to one of its 3435 * descendants and give it a hint about what direction focus is heading. 3436 * 3437 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 3438 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 3439 * while the device is in touch mode. 3440 * 3441 * See also {@link #focusSearch}, which is what you call to say that you 3442 * have focus, and you want your parent to look for the next one. 3443 * 3444 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 3445 * <code>null</code> set for the previously focused rectangle. 3446 * 3447 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 3448 * @return Whether this view or one of its descendants actually took focus. 3449 */ 3450 public final boolean requestFocus(int direction) { 3451 return requestFocus(direction, null); 3452 } 3453 3454 /** 3455 * Call this to try to give focus to a specific view or to one of its descendants 3456 * and give it hints about the direction and a specific rectangle that the focus 3457 * is coming from. The rectangle can help give larger views a finer grained hint 3458 * about where focus is coming from, and therefore, where to show selection, or 3459 * forward focus change internally. 3460 * 3461 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 3462 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 3463 * while the device is in touch mode. 3464 * 3465 * A View will not take focus if it is not visible. 3466 * 3467 * A View will not take focus if one of its parents has {@link android.view.ViewGroup#getDescendantFocusability()} 3468 * equal to {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 3469 * 3470 * See also {@link #focusSearch}, which is what you call to say that you 3471 * have focus, and you want your parent to look for the next one. 3472 * 3473 * You may wish to override this method if your custom {@link View} has an internal 3474 * {@link View} that it wishes to forward the request to. 3475 * 3476 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 3477 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 3478 * to give a finer grained hint about where focus is coming from. May be null 3479 * if there is no hint. 3480 * @return Whether this view or one of its descendants actually took focus. 3481 */ 3482 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 3483 // need to be focusable 3484 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 3485 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 3486 return false; 3487 } 3488 3489 // need to be focusable in touch mode if in touch mode 3490 if (isInTouchMode() && 3491 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 3492 return false; 3493 } 3494 3495 // need to not have any parents blocking us 3496 if (hasAncestorThatBlocksDescendantFocus()) { 3497 return false; 3498 } 3499 3500 handleFocusGainInternal(direction, previouslyFocusedRect); 3501 return true; 3502 } 3503 3504 /** 3505 * Call this to try to give focus to a specific view or to one of its descendants. This is a 3506 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 3507 * touch mode to request focus when they are touched. 3508 * 3509 * @return Whether this view or one of its descendants actually took focus. 3510 * 3511 * @see #isInTouchMode() 3512 * 3513 */ 3514 public final boolean requestFocusFromTouch() { 3515 // Leave touch mode if we need to 3516 if (isInTouchMode()) { 3517 View root = getRootView(); 3518 if (root != null) { 3519 ViewRoot viewRoot = (ViewRoot)root.getParent(); 3520 if (viewRoot != null) { 3521 viewRoot.ensureTouchMode(false); 3522 } 3523 } 3524 } 3525 return requestFocus(View.FOCUS_DOWN); 3526 } 3527 3528 /** 3529 * @return Whether any ancestor of this view blocks descendant focus. 3530 */ 3531 private boolean hasAncestorThatBlocksDescendantFocus() { 3532 ViewParent ancestor = mParent; 3533 while (ancestor instanceof ViewGroup) { 3534 final ViewGroup vgAncestor = (ViewGroup) ancestor; 3535 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 3536 return true; 3537 } else { 3538 ancestor = vgAncestor.getParent(); 3539 } 3540 } 3541 return false; 3542 } 3543 3544 /** 3545 * This is called when a container is going to temporarily detach a child 3546 * that currently has focus, with 3547 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 3548 * It will either be followed by {@link #onFinishTemporaryDetach()} or 3549 * {@link #onDetachedFromWindow()} when the container is done. Generally 3550 * this is currently only done ListView for a view with focus. 3551 */ 3552 public void onStartTemporaryDetach() { 3553 } 3554 3555 /** 3556 * Called after {@link #onStartTemporaryDetach} when the container is done 3557 * changing the view. 3558 */ 3559 public void onFinishTemporaryDetach() { 3560 } 3561 3562 /** 3563 * capture information of this view for later analysis: developement only 3564 * check dynamic switch to make sure we only dump view 3565 * when ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW) is set 3566 */ 3567 private static void captureViewInfo(String subTag, View v) { 3568 if (v == null || SystemProperties.getInt(ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW, 0) == 0) { 3569 return; 3570 } 3571 ViewDebug.dumpCapturedView(subTag, v); 3572 } 3573 3574 /** 3575 * Dispatch a key event before it is processed by any input method 3576 * associated with the view hierarchy. This can be used to intercept 3577 * key events in special situations before the IME consumes them; a 3578 * typical example would be handling the BACK key to update the application's 3579 * UI instead of allowing the IME to see it and close itself. 3580 * 3581 * @param event The key event to be dispatched. 3582 * @return True if the event was handled, false otherwise. 3583 */ 3584 public boolean dispatchKeyEventPreIme(KeyEvent event) { 3585 return onKeyPreIme(event.getKeyCode(), event); 3586 } 3587 3588 /** 3589 * Dispatch a key event to the next view on the focus path. This path runs 3590 * from the top of the view tree down to the currently focused view. If this 3591 * view has focus, it will dispatch to itself. Otherwise it will dispatch 3592 * the next node down the focus path. This method also fires any key 3593 * listeners. 3594 * 3595 * @param event The key event to be dispatched. 3596 * @return True if the event was handled, false otherwise. 3597 */ 3598 public boolean dispatchKeyEvent(KeyEvent event) { 3599 // If any attached key listener a first crack at the event. 3600 //noinspection SimplifiableIfStatement 3601 3602 if (android.util.Config.LOGV) { 3603 captureViewInfo("captureViewKeyEvent", this); 3604 } 3605 3606 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 3607 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 3608 return true; 3609 } 3610 3611 return event.dispatch(this); 3612 } 3613 3614 /** 3615 * Dispatches a key shortcut event. 3616 * 3617 * @param event The key event to be dispatched. 3618 * @return True if the event was handled by the view, false otherwise. 3619 */ 3620 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 3621 return onKeyShortcut(event.getKeyCode(), event); 3622 } 3623 3624 /** 3625 * Pass the touch screen motion event down to the target view, or this 3626 * view if it is the target. 3627 * 3628 * @param event The motion event to be dispatched. 3629 * @return True if the event was handled by the view, false otherwise. 3630 */ 3631 public boolean dispatchTouchEvent(MotionEvent event) { 3632 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 3633 mOnTouchListener.onTouch(this, event)) { 3634 return true; 3635 } 3636 return onTouchEvent(event); 3637 } 3638 3639 /** 3640 * Pass a trackball motion event down to the focused view. 3641 * 3642 * @param event The motion event to be dispatched. 3643 * @return True if the event was handled by the view, false otherwise. 3644 */ 3645 public boolean dispatchTrackballEvent(MotionEvent event) { 3646 //Log.i("view", "view=" + this + ", " + event.toString()); 3647 return onTrackballEvent(event); 3648 } 3649 3650 /** 3651 * Called when the window containing this view gains or loses window focus. 3652 * ViewGroups should override to route to their children. 3653 * 3654 * @param hasFocus True if the window containing this view now has focus, 3655 * false otherwise. 3656 */ 3657 public void dispatchWindowFocusChanged(boolean hasFocus) { 3658 onWindowFocusChanged(hasFocus); 3659 } 3660 3661 /** 3662 * Called when the window containing this view gains or loses focus. Note 3663 * that this is separate from view focus: to receive key events, both 3664 * your view and its window must have focus. If a window is displayed 3665 * on top of yours that takes input focus, then your own window will lose 3666 * focus but the view focus will remain unchanged. 3667 * 3668 * @param hasWindowFocus True if the window containing this view now has 3669 * focus, false otherwise. 3670 */ 3671 public void onWindowFocusChanged(boolean hasWindowFocus) { 3672 InputMethodManager imm = InputMethodManager.peekInstance(); 3673 if (!hasWindowFocus) { 3674 if (isPressed()) { 3675 setPressed(false); 3676 } 3677 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 3678 imm.focusOut(this); 3679 } 3680 if (mPendingCheckForLongPress != null) { 3681 removeCallbacks(mPendingCheckForLongPress); 3682 } 3683 onFocusLost(); 3684 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 3685 imm.focusIn(this); 3686 } 3687 refreshDrawableState(); 3688 } 3689 3690 /** 3691 * Returns true if this view is in a window that currently has window focus. 3692 * Note that this is not the same as the view itself having focus. 3693 * 3694 * @return True if this view is in a window that currently has window focus. 3695 */ 3696 public boolean hasWindowFocus() { 3697 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 3698 } 3699 3700 /** 3701 * Dispatch a window visibility change down the view hierarchy. 3702 * ViewGroups should override to route to their children. 3703 * 3704 * @param visibility The new visibility of the window. 3705 * 3706 * @see #onWindowVisibilityChanged 3707 */ 3708 public void dispatchWindowVisibilityChanged(int visibility) { 3709 onWindowVisibilityChanged(visibility); 3710 } 3711 3712 /** 3713 * Called when the window containing has change its visibility 3714 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 3715 * that this tells you whether or not your window is being made visible 3716 * to the window manager; this does <em>not</em> tell you whether or not 3717 * your window is obscured by other windows on the screen, even if it 3718 * is itself visible. 3719 * 3720 * @param visibility The new visibility of the window. 3721 */ 3722 protected void onWindowVisibilityChanged(int visibility) { 3723 } 3724 3725 /** 3726 * Returns the current visibility of the window this view is attached to 3727 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 3728 * 3729 * @return Returns the current visibility of the view's window. 3730 */ 3731 public int getWindowVisibility() { 3732 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 3733 } 3734 3735 /** 3736 * Retrieve the overall visible display size in which the window this view is 3737 * attached to has been positioned in. This takes into account screen 3738 * decorations above the window, for both cases where the window itself 3739 * is being position inside of them or the window is being placed under 3740 * then and covered insets are used for the window to position its content 3741 * inside. In effect, this tells you the available area where content can 3742 * be placed and remain visible to users. 3743 * 3744 * <p>This function requires an IPC back to the window manager to retrieve 3745 * the requested information, so should not be used in performance critical 3746 * code like drawing. 3747 * 3748 * @param outRect Filled in with the visible display frame. If the view 3749 * is not attached to a window, this is simply the raw display size. 3750 */ 3751 public void getWindowVisibleDisplayFrame(Rect outRect) { 3752 if (mAttachInfo != null) { 3753 try { 3754 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 3755 } catch (RemoteException e) { 3756 return; 3757 } 3758 // XXX This is really broken, and probably all needs to be done 3759 // in the window manager, and we need to know more about whether 3760 // we want the area behind or in front of the IME. 3761 final Rect insets = mAttachInfo.mVisibleInsets; 3762 outRect.left += insets.left; 3763 outRect.top += insets.top; 3764 outRect.right -= insets.right; 3765 outRect.bottom -= insets.bottom; 3766 return; 3767 } 3768 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 3769 outRect.set(0, 0, d.getWidth(), d.getHeight()); 3770 } 3771 3772 /** 3773 * Private function to aggregate all per-view attributes in to the view 3774 * root. 3775 */ 3776 void dispatchCollectViewAttributes(int visibility) { 3777 performCollectViewAttributes(visibility); 3778 } 3779 3780 void performCollectViewAttributes(int visibility) { 3781 //noinspection PointlessBitwiseExpression 3782 if (((visibility | mViewFlags) & (VISIBILITY_MASK | KEEP_SCREEN_ON)) 3783 == (VISIBLE | KEEP_SCREEN_ON)) { 3784 mAttachInfo.mKeepScreenOn = true; 3785 } 3786 } 3787 3788 void needGlobalAttributesUpdate(boolean force) { 3789 AttachInfo ai = mAttachInfo; 3790 if (ai != null) { 3791 if (ai.mKeepScreenOn || force) { 3792 ai.mRecomputeGlobalAttributes = true; 3793 } 3794 } 3795 } 3796 3797 /** 3798 * Returns whether the device is currently in touch mode. Touch mode is entered 3799 * once the user begins interacting with the device by touch, and affects various 3800 * things like whether focus is always visible to the user. 3801 * 3802 * @return Whether the device is in touch mode. 3803 */ 3804 @ViewDebug.ExportedProperty 3805 public boolean isInTouchMode() { 3806 if (mAttachInfo != null) { 3807 return mAttachInfo.mInTouchMode; 3808 } else { 3809 return ViewRoot.isInTouchMode(); 3810 } 3811 } 3812 3813 /** 3814 * Returns the context the view is running in, through which it can 3815 * access the current theme, resources, etc. 3816 * 3817 * @return The view's Context. 3818 */ 3819 @ViewDebug.CapturedViewProperty 3820 public final Context getContext() { 3821 return mContext; 3822 } 3823 3824 /** 3825 * Handle a key event before it is processed by any input method 3826 * associated with the view hierarchy. This can be used to intercept 3827 * key events in special situations before the IME consumes them; a 3828 * typical example would be handling the BACK key to update the application's 3829 * UI instead of allowing the IME to see it and close itself. 3830 * 3831 * @param keyCode The value in event.getKeyCode(). 3832 * @param event Description of the key event. 3833 * @return If you handled the event, return true. If you want to allow the 3834 * event to be handled by the next receiver, return false. 3835 */ 3836 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 3837 return false; 3838 } 3839 3840 /** 3841 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 3842 * KeyEvent.Callback.onKeyMultiple()}: perform press of the view 3843 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 3844 * is released, if the view is enabled and clickable. 3845 * 3846 * @param keyCode A key code that represents the button pressed, from 3847 * {@link android.view.KeyEvent}. 3848 * @param event The KeyEvent object that defines the button action. 3849 */ 3850 public boolean onKeyDown(int keyCode, KeyEvent event) { 3851 boolean result = false; 3852 3853 switch (keyCode) { 3854 case KeyEvent.KEYCODE_DPAD_CENTER: 3855 case KeyEvent.KEYCODE_ENTER: { 3856 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 3857 return true; 3858 } 3859 // Long clickable items don't necessarily have to be clickable 3860 if (((mViewFlags & CLICKABLE) == CLICKABLE || 3861 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 3862 (event.getRepeatCount() == 0)) { 3863 setPressed(true); 3864 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 3865 postCheckForLongClick(); 3866 } 3867 return true; 3868 } 3869 break; 3870 } 3871 } 3872 return result; 3873 } 3874 3875 /** 3876 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 3877 * KeyEvent.Callback.onKeyMultiple()}: perform clicking of the view 3878 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 3879 * {@link KeyEvent#KEYCODE_ENTER} is released. 3880 * 3881 * @param keyCode A key code that represents the button pressed, from 3882 * {@link android.view.KeyEvent}. 3883 * @param event The KeyEvent object that defines the button action. 3884 */ 3885 public boolean onKeyUp(int keyCode, KeyEvent event) { 3886 boolean result = false; 3887 3888 switch (keyCode) { 3889 case KeyEvent.KEYCODE_DPAD_CENTER: 3890 case KeyEvent.KEYCODE_ENTER: { 3891 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 3892 return true; 3893 } 3894 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 3895 setPressed(false); 3896 3897 if (!mHasPerformedLongPress) { 3898 // This is a tap, so remove the longpress check 3899 if (mPendingCheckForLongPress != null) { 3900 removeCallbacks(mPendingCheckForLongPress); 3901 } 3902 3903 result = performClick(); 3904 } 3905 } 3906 break; 3907 } 3908 } 3909 return result; 3910 } 3911 3912 /** 3913 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 3914 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 3915 * the event). 3916 * 3917 * @param keyCode A key code that represents the button pressed, from 3918 * {@link android.view.KeyEvent}. 3919 * @param repeatCount The number of times the action was made. 3920 * @param event The KeyEvent object that defines the button action. 3921 */ 3922 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 3923 return false; 3924 } 3925 3926 /** 3927 * Called when an unhandled key shortcut event occurs. 3928 * 3929 * @param keyCode The value in event.getKeyCode(). 3930 * @param event Description of the key event. 3931 * @return If you handled the event, return true. If you want to allow the 3932 * event to be handled by the next receiver, return false. 3933 */ 3934 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 3935 return false; 3936 } 3937 3938 /** 3939 * Check whether the called view is a text editor, in which case it 3940 * would make sense to automatically display a soft input window for 3941 * it. Subclasses should override this if they implement 3942 * {@link #onCreateInputConnection(EditorInfo)} to return true if 3943 * a call on that method would return a non-null InputConnection, and 3944 * they are really a first-class editor that the user would normally 3945 * start typing on when the go into a window containing your view. 3946 * 3947 * <p>The default implementation always returns false. This does 3948 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 3949 * will not be called or the user can not otherwise perform edits on your 3950 * view; it is just a hint to the system that this is not the primary 3951 * purpose of this view. 3952 * 3953 * @return Returns true if this view is a text editor, else false. 3954 */ 3955 public boolean onCheckIsTextEditor() { 3956 return false; 3957 } 3958 3959 /** 3960 * Create a new InputConnection for an InputMethod to interact 3961 * with the view. The default implementation returns null, since it doesn't 3962 * support input methods. You can override this to implement such support. 3963 * This is only needed for views that take focus and text input. 3964 * 3965 * <p>When implementing this, you probably also want to implement 3966 * {@link #onCheckIsTextEditor()} to indicate you will return a 3967 * non-null InputConnection. 3968 * 3969 * @param outAttrs Fill in with attribute information about the connection. 3970 */ 3971 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 3972 return null; 3973 } 3974 3975 /** 3976 * Called by the {@link android.view.inputmethod.InputMethodManager} 3977 * when a view who is not the current 3978 * input connection target is trying to make a call on the manager. The 3979 * default implementation returns false; you can override this to return 3980 * true for certain views if you are performing InputConnection proxying 3981 * to them. 3982 * @param view The View that is making the InputMethodManager call. 3983 * @return Return true to allow the call, false to reject. 3984 */ 3985 public boolean checkInputConnectionProxy(View view) { 3986 return false; 3987 } 3988 3989 /** 3990 * Show the context menu for this view. It is not safe to hold on to the 3991 * menu after returning from this method. 3992 * 3993 * @param menu The context menu to populate 3994 */ 3995 public void createContextMenu(ContextMenu menu) { 3996 ContextMenuInfo menuInfo = getContextMenuInfo(); 3997 3998 // Sets the current menu info so all items added to menu will have 3999 // my extra info set. 4000 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 4001 4002 onCreateContextMenu(menu); 4003 if (mOnCreateContextMenuListener != null) { 4004 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 4005 } 4006 4007 // Clear the extra information so subsequent items that aren't mine don't 4008 // have my extra info. 4009 ((MenuBuilder)menu).setCurrentMenuInfo(null); 4010 4011 if (mParent != null) { 4012 mParent.createContextMenu(menu); 4013 } 4014 } 4015 4016 /** 4017 * Views should implement this if they have extra information to associate 4018 * with the context menu. The return result is supplied as a parameter to 4019 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 4020 * callback. 4021 * 4022 * @return Extra information about the item for which the context menu 4023 * should be shown. This information will vary across different 4024 * subclasses of View. 4025 */ 4026 protected ContextMenuInfo getContextMenuInfo() { 4027 return null; 4028 } 4029 4030 /** 4031 * Views should implement this if the view itself is going to add items to 4032 * the context menu. 4033 * 4034 * @param menu the context menu to populate 4035 */ 4036 protected void onCreateContextMenu(ContextMenu menu) { 4037 } 4038 4039 /** 4040 * Implement this method to handle trackball motion events. The 4041 * <em>relative</em> movement of the trackball since the last event 4042 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 4043 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 4044 * that a movement of 1 corresponds to the user pressing one DPAD key (so 4045 * they will often be fractional values, representing the more fine-grained 4046 * movement information available from a trackball). 4047 * 4048 * @param event The motion event. 4049 * @return True if the event was handled, false otherwise. 4050 */ 4051 public boolean onTrackballEvent(MotionEvent event) { 4052 return false; 4053 } 4054 4055 /** 4056 * Implement this method to handle touch screen motion events. 4057 * 4058 * @param event The motion event. 4059 * @return True if the event was handled, false otherwise. 4060 */ 4061 public boolean onTouchEvent(MotionEvent event) { 4062 final int viewFlags = mViewFlags; 4063 4064 if ((viewFlags & ENABLED_MASK) == DISABLED) { 4065 // A disabled view that is clickable still consumes the touch 4066 // events, it just doesn't respond to them. 4067 return (((viewFlags & CLICKABLE) == CLICKABLE || 4068 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 4069 } 4070 4071 if (mTouchDelegate != null) { 4072 if (mTouchDelegate.onTouchEvent(event)) { 4073 return true; 4074 } 4075 } 4076 4077 if (((viewFlags & CLICKABLE) == CLICKABLE || 4078 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 4079 switch (event.getAction()) { 4080 case MotionEvent.ACTION_UP: 4081 if ((mPrivateFlags & PRESSED) != 0) { 4082 // take focus if we don't have it already and we should in 4083 // touch mode. 4084 boolean focusTaken = false; 4085 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 4086 focusTaken = requestFocus(); 4087 } 4088 4089 if (!mHasPerformedLongPress) { 4090 // This is a tap, so remove the longpress check 4091 if (mPendingCheckForLongPress != null) { 4092 removeCallbacks(mPendingCheckForLongPress); 4093 } 4094 4095 // Only perform take click actions if we were in the pressed state 4096 if (!focusTaken) { 4097 performClick(); 4098 } 4099 } 4100 4101 if (mUnsetPressedState == null) { 4102 mUnsetPressedState = new UnsetPressedState(); 4103 } 4104 4105 if (!post(mUnsetPressedState)) { 4106 // If the post failed, unpress right now 4107 mUnsetPressedState.run(); 4108 } 4109 } 4110 break; 4111 4112 case MotionEvent.ACTION_DOWN: 4113 mPrivateFlags |= PRESSED; 4114 refreshDrawableState(); 4115 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 4116 postCheckForLongClick(); 4117 } 4118 break; 4119 4120 case MotionEvent.ACTION_CANCEL: 4121 mPrivateFlags &= ~PRESSED; 4122 refreshDrawableState(); 4123 break; 4124 4125 case MotionEvent.ACTION_MOVE: 4126 final int x = (int) event.getX(); 4127 final int y = (int) event.getY(); 4128 4129 // Be lenient about moving outside of buttons 4130 int slop = ViewConfiguration.get(mContext).getScaledTouchSlop(); 4131 if ((x < 0 - slop) || (x >= getWidth() + slop) || 4132 (y < 0 - slop) || (y >= getHeight() + slop)) { 4133 // Outside button 4134 if ((mPrivateFlags & PRESSED) != 0) { 4135 // Remove any future long press checks 4136 if (mPendingCheckForLongPress != null) { 4137 removeCallbacks(mPendingCheckForLongPress); 4138 } 4139 4140 // Need to switch from pressed to not pressed 4141 mPrivateFlags &= ~PRESSED; 4142 refreshDrawableState(); 4143 } 4144 } else { 4145 // Inside button 4146 if ((mPrivateFlags & PRESSED) == 0) { 4147 // Need to switch from not pressed to pressed 4148 mPrivateFlags |= PRESSED; 4149 refreshDrawableState(); 4150 } 4151 } 4152 break; 4153 } 4154 return true; 4155 } 4156 4157 return false; 4158 } 4159 4160 /** 4161 * Cancels a pending long press. Your subclass can use this if you 4162 * want the context menu to come up if the user presses and holds 4163 * at the same place, but you don't want it to come up if they press 4164 * and then move around enough to cause scrolling. 4165 */ 4166 public void cancelLongPress() { 4167 if (mPendingCheckForLongPress != null) { 4168 removeCallbacks(mPendingCheckForLongPress); 4169 } 4170 } 4171 4172 /** 4173 * Sets the TouchDelegate for this View. 4174 */ 4175 public void setTouchDelegate(TouchDelegate delegate) { 4176 mTouchDelegate = delegate; 4177 } 4178 4179 /** 4180 * Gets the TouchDelegate for this View. 4181 */ 4182 public TouchDelegate getTouchDelegate() { 4183 return mTouchDelegate; 4184 } 4185 4186 /** 4187 * Set flags controlling behavior of this view. 4188 * 4189 * @param flags Constant indicating the value which should be set 4190 * @param mask Constant indicating the bit range that should be changed 4191 */ 4192 void setFlags(int flags, int mask) { 4193 int old = mViewFlags; 4194 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 4195 4196 int changed = mViewFlags ^ old; 4197 if (changed == 0) { 4198 return; 4199 } 4200 int privateFlags = mPrivateFlags; 4201 4202 /* Check if the FOCUSABLE bit has changed */ 4203 if (((changed & FOCUSABLE_MASK) != 0) && 4204 ((privateFlags & HAS_BOUNDS) !=0)) { 4205 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 4206 && ((privateFlags & FOCUSED) != 0)) { 4207 /* Give up focus if we are no longer focusable */ 4208 clearFocus(); 4209 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 4210 && ((privateFlags & FOCUSED) == 0)) { 4211 /* 4212 * Tell the view system that we are now available to take focus 4213 * if no one else already has it. 4214 */ 4215 if (mParent != null) mParent.focusableViewAvailable(this); 4216 } 4217 } 4218 4219 if ((flags & VISIBILITY_MASK) == VISIBLE) { 4220 if ((changed & VISIBILITY_MASK) != 0) { 4221 /* 4222 * If this view is becoming visible, set the DRAWN flag so that 4223 * the next invalidate() will not be skipped. 4224 */ 4225 mPrivateFlags |= DRAWN; 4226 4227 needGlobalAttributesUpdate(true); 4228 4229 // a view becoming visible is worth notifying the parent 4230 // about in case nothing has focus. even if this specific view 4231 // isn't focusable, it may contain something that is, so let 4232 // the root view try to give this focus if nothing else does. 4233 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 4234 mParent.focusableViewAvailable(this); 4235 } 4236 } 4237 } 4238 4239 /* Check if the GONE bit has changed */ 4240 if ((changed & GONE) != 0) { 4241 needGlobalAttributesUpdate(false); 4242 requestLayout(); 4243 invalidate(); 4244 4245 if (((mViewFlags & VISIBILITY_MASK) == GONE) && hasFocus()) { 4246 clearFocus(); 4247 } 4248 if (mAttachInfo != null) { 4249 mAttachInfo.mViewVisibilityChanged = true; 4250 } 4251 } 4252 4253 /* Check if the VISIBLE bit has changed */ 4254 if ((changed & INVISIBLE) != 0) { 4255 needGlobalAttributesUpdate(false); 4256 invalidate(); 4257 4258 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 4259 // root view becoming invisible shouldn't clear focus 4260 if (getRootView() != this) { 4261 clearFocus(); 4262 } 4263 } 4264 if (mAttachInfo != null) { 4265 mAttachInfo.mViewVisibilityChanged = true; 4266 } 4267 } 4268 4269 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 4270 destroyDrawingCache(); 4271 } 4272 4273 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 4274 destroyDrawingCache(); 4275 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4276 } 4277 4278 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 4279 destroyDrawingCache(); 4280 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4281 } 4282 4283 if ((changed & DRAW_MASK) != 0) { 4284 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 4285 if (mBGDrawable != null) { 4286 mPrivateFlags &= ~SKIP_DRAW; 4287 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 4288 } else { 4289 mPrivateFlags |= SKIP_DRAW; 4290 } 4291 } else { 4292 mPrivateFlags &= ~SKIP_DRAW; 4293 } 4294 requestLayout(); 4295 invalidate(); 4296 } 4297 4298 if ((changed & KEEP_SCREEN_ON) != 0) { 4299 if (mParent != null) { 4300 mParent.recomputeViewAttributes(this); 4301 } 4302 } 4303 } 4304 4305 /** 4306 * Change the view's z order in the tree, so it's on top of other sibling 4307 * views 4308 */ 4309 public void bringToFront() { 4310 if (mParent != null) { 4311 mParent.bringChildToFront(this); 4312 } 4313 } 4314 4315 /** 4316 * This is called in response to an internal scroll in this view (i.e., the 4317 * view scrolled its own contents). This is typically as a result of 4318 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 4319 * called. 4320 * 4321 * @param l Current horizontal scroll origin. 4322 * @param t Current vertical scroll origin. 4323 * @param oldl Previous horizontal scroll origin. 4324 * @param oldt Previous vertical scroll origin. 4325 */ 4326 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 4327 mBackgroundSizeChanged = true; 4328 4329 final AttachInfo ai = mAttachInfo; 4330 if (ai != null) { 4331 ai.mViewScrollChanged = true; 4332 } 4333 } 4334 4335 /** 4336 * This is called during layout when the size of this view has changed. If 4337 * you were just added to the view hierarchy, you're called with the old 4338 * values of 0. 4339 * 4340 * @param w Current width of this view. 4341 * @param h Current height of this view. 4342 * @param oldw Old width of this view. 4343 * @param oldh Old height of this view. 4344 */ 4345 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 4346 } 4347 4348 /** 4349 * Called by draw to draw the child views. This may be overridden 4350 * by derived classes to gain control just before its children are drawn 4351 * (but after its own view has been drawn). 4352 * @param canvas the canvas on which to draw the view 4353 */ 4354 protected void dispatchDraw(Canvas canvas) { 4355 } 4356 4357 /** 4358 * Gets the parent of this view. Note that the parent is a 4359 * ViewParent and not necessarily a View. 4360 * 4361 * @return Parent of this view. 4362 */ 4363 public final ViewParent getParent() { 4364 return mParent; 4365 } 4366 4367 /** 4368 * Return the scrolled left position of this view. This is the left edge of 4369 * the displayed part of your view. You do not need to draw any pixels 4370 * farther left, since those are outside of the frame of your view on 4371 * screen. 4372 * 4373 * @return The left edge of the displayed part of your view, in pixels. 4374 */ 4375 public final int getScrollX() { 4376 return mScrollX; 4377 } 4378 4379 /** 4380 * Return the scrolled top position of this view. This is the top edge of 4381 * the displayed part of your view. You do not need to draw any pixels above 4382 * it, since those are outside of the frame of your view on screen. 4383 * 4384 * @return The top edge of the displayed part of your view, in pixels. 4385 */ 4386 public final int getScrollY() { 4387 return mScrollY; 4388 } 4389 4390 /** 4391 * Return the width of the your view. 4392 * 4393 * @return The width of your view, in pixels. 4394 */ 4395 @ViewDebug.ExportedProperty 4396 public final int getWidth() { 4397 return mRight - mLeft; 4398 } 4399 4400 /** 4401 * Return the height of your view. 4402 * 4403 * @return The height of your view, in pixels. 4404 */ 4405 @ViewDebug.ExportedProperty 4406 public final int getHeight() { 4407 return mBottom - mTop; 4408 } 4409 4410 /** 4411 * Return the visible drawing bounds of your view. Fills in the output 4412 * rectangle with the values from getScrollX(), getScrollY(), 4413 * getWidth(), and getHeight(). 4414 * 4415 * @param outRect The (scrolled) drawing bounds of the view. 4416 */ 4417 public void getDrawingRect(Rect outRect) { 4418 outRect.left = mScrollX; 4419 outRect.top = mScrollY; 4420 outRect.right = mScrollX + (mRight - mLeft); 4421 outRect.bottom = mScrollY + (mBottom - mTop); 4422 } 4423 4424 /** 4425 * The width of this view as measured in the most recent call to measure(). 4426 * This should be used during measurement and layout calculations only. Use 4427 * {@link #getWidth()} to see how wide a view is after layout. 4428 * 4429 * @return The measured width of this view. 4430 */ 4431 public final int getMeasuredWidth() { 4432 return mMeasuredWidth; 4433 } 4434 4435 /** 4436 * The height of this view as measured in the most recent call to measure(). 4437 * This should be used during measurement and layout calculations only. Use 4438 * {@link #getHeight()} to see how tall a view is after layout. 4439 * 4440 * @return The measured height of this view. 4441 */ 4442 public final int getMeasuredHeight() { 4443 return mMeasuredHeight; 4444 } 4445 4446 /** 4447 * Top position of this view relative to its parent. 4448 * 4449 * @return The top of this view, in pixels. 4450 */ 4451 @ViewDebug.CapturedViewProperty 4452 public final int getTop() { 4453 return mTop; 4454 } 4455 4456 /** 4457 * Bottom position of this view relative to its parent. 4458 * 4459 * @return The bottom of this view, in pixels. 4460 */ 4461 @ViewDebug.CapturedViewProperty 4462 public final int getBottom() { 4463 return mBottom; 4464 } 4465 4466 /** 4467 * Left position of this view relative to its parent. 4468 * 4469 * @return The left edge of this view, in pixels. 4470 */ 4471 @ViewDebug.CapturedViewProperty 4472 public final int getLeft() { 4473 return mLeft; 4474 } 4475 4476 /** 4477 * Right position of this view relative to its parent. 4478 * 4479 * @return The right edge of this view, in pixels. 4480 */ 4481 @ViewDebug.CapturedViewProperty 4482 public final int getRight() { 4483 return mRight; 4484 } 4485 4486 /** 4487 * Hit rectangle in parent's coordinates 4488 * 4489 * @param outRect The hit rectangle of the view. 4490 */ 4491 public void getHitRect(Rect outRect) { 4492 outRect.set(mLeft, mTop, mRight, mBottom); 4493 } 4494 4495 /** 4496 * When a view has focus and the user navigates away from it, the next view is searched for 4497 * starting from the rectangle filled in by this method. 4498 * 4499 * By default, the rectange is the {@link #getDrawingRect})of the view. However, if your 4500 * view maintains some idea of internal selection, such as a cursor, or a selected row 4501 * or column, you should override this method and fill in a more specific rectangle. 4502 * 4503 * @param r The rectangle to fill in, in this view's coordinates. 4504 */ 4505 public void getFocusedRect(Rect r) { 4506 getDrawingRect(r); 4507 } 4508 4509 /** 4510 * If some part of this view is not clipped by any of its parents, then 4511 * return that area in r in global (root) coordinates. To convert r to local 4512 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 4513 * -globalOffset.y)) If the view is completely clipped or translated out, 4514 * return false. 4515 * 4516 * @param r If true is returned, r holds the global coordinates of the 4517 * visible portion of this view. 4518 * @param globalOffset If true is returned, globalOffset holds the dx,dy 4519 * between this view and its root. globalOffet may be null. 4520 * @return true if r is non-empty (i.e. part of the view is visible at the 4521 * root level. 4522 */ 4523 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 4524 int width = mRight - mLeft; 4525 int height = mBottom - mTop; 4526 if (width > 0 && height > 0) { 4527 r.set(0, 0, width, height); 4528 if (globalOffset != null) { 4529 globalOffset.set(-mScrollX, -mScrollY); 4530 } 4531 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 4532 } 4533 return false; 4534 } 4535 4536 public final boolean getGlobalVisibleRect(Rect r) { 4537 return getGlobalVisibleRect(r, null); 4538 } 4539 4540 public final boolean getLocalVisibleRect(Rect r) { 4541 Point offset = new Point(); 4542 if (getGlobalVisibleRect(r, offset)) { 4543 r.offset(-offset.x, -offset.y); // make r local 4544 return true; 4545 } 4546 return false; 4547 } 4548 4549 /** 4550 * Offset this view's vertical location by the specified number of pixels. 4551 * 4552 * @param offset the number of pixels to offset the view by 4553 */ 4554 public void offsetTopAndBottom(int offset) { 4555 mTop += offset; 4556 mBottom += offset; 4557 } 4558 4559 /** 4560 * Offset this view's horizontal location by the specified amount of pixels. 4561 * 4562 * @param offset the numer of pixels to offset the view by 4563 */ 4564 public void offsetLeftAndRight(int offset) { 4565 mLeft += offset; 4566 mRight += offset; 4567 } 4568 4569 /** 4570 * Get the LayoutParams associated with this view. All views should have 4571 * layout parameters. These supply parameters to the <i>parent</i> of this 4572 * view specifying how it should be arranged. There are many subclasses of 4573 * ViewGroup.LayoutParams, and these correspond to the different subclasses 4574 * of ViewGroup that are responsible for arranging their children. 4575 * @return The LayoutParams associated with this view 4576 */ 4577 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 4578 public ViewGroup.LayoutParams getLayoutParams() { 4579 return mLayoutParams; 4580 } 4581 4582 /** 4583 * Set the layout parameters associated with this view. These supply 4584 * parameters to the <i>parent</i> of this view specifying how it should be 4585 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 4586 * correspond to the different subclasses of ViewGroup that are responsible 4587 * for arranging their children. 4588 * 4589 * @param params the layout parameters for this view 4590 */ 4591 public void setLayoutParams(ViewGroup.LayoutParams params) { 4592 if (params == null) { 4593 throw new NullPointerException("params == null"); 4594 } 4595 mLayoutParams = params; 4596 requestLayout(); 4597 } 4598 4599 /** 4600 * Set the scrolled position of your view. This will cause a call to 4601 * {@link #onScrollChanged(int, int, int, int)} and the view will be 4602 * invalidated. 4603 * @param x the x position to scroll to 4604 * @param y the y position to scroll to 4605 */ 4606 public void scrollTo(int x, int y) { 4607 if (mScrollX != x || mScrollY != y) { 4608 int oldX = mScrollX; 4609 int oldY = mScrollY; 4610 mScrollX = x; 4611 mScrollY = y; 4612 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 4613 invalidate(); 4614 } 4615 } 4616 4617 /** 4618 * Move the scrolled position of your view. This will cause a call to 4619 * {@link #onScrollChanged(int, int, int, int)} and the view will be 4620 * invalidated. 4621 * @param x the amount of pixels to scroll by horizontally 4622 * @param y the amount of pixels to scroll by vertically 4623 */ 4624 public void scrollBy(int x, int y) { 4625 scrollTo(mScrollX + x, mScrollY + y); 4626 } 4627 4628 /** 4629 * Mark the the area defined by dirty as needing to be drawn. If the view is 4630 * visible, {@link #onDraw} will be called at some point in the future. 4631 * This must be called from a UI thread. To call from a non-UI thread, call 4632 * {@link #postInvalidate()}. 4633 * 4634 * WARNING: This method is destructive to dirty. 4635 * @param dirty the rectangle representing the bounds of the dirty region 4636 */ 4637 public void invalidate(Rect dirty) { 4638 if (ViewDebug.TRACE_HIERARCHY) { 4639 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 4640 } 4641 4642 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS)) { 4643 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4644 final ViewParent p = mParent; 4645 final AttachInfo ai = mAttachInfo; 4646 if (p != null && ai != null) { 4647 final int scrollX = mScrollX; 4648 final int scrollY = mScrollY; 4649 final Rect r = ai.mTmpInvalRect; 4650 r.set(dirty.left - scrollX, dirty.top - scrollY, 4651 dirty.right - scrollX, dirty.bottom - scrollY); 4652 mParent.invalidateChild(this, r); 4653 } 4654 } 4655 } 4656 4657 /** 4658 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 4659 * The coordinates of the dirty rect are relative to the view. 4660 * If the view is visible, {@link #onDraw} will be called at some point 4661 * in the future. This must be called from a UI thread. To call 4662 * from a non-UI thread, call {@link #postInvalidate()}. 4663 * @param l the left position of the dirty region 4664 * @param t the top position of the dirty region 4665 * @param r the right position of the dirty region 4666 * @param b the bottom position of the dirty region 4667 */ 4668 public void invalidate(int l, int t, int r, int b) { 4669 if (ViewDebug.TRACE_HIERARCHY) { 4670 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 4671 } 4672 4673 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS)) { 4674 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4675 final ViewParent p = mParent; 4676 final AttachInfo ai = mAttachInfo; 4677 if (p != null && ai != null && l < r && t < b) { 4678 final int scrollX = mScrollX; 4679 final int scrollY = mScrollY; 4680 final Rect tmpr = ai.mTmpInvalRect; 4681 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 4682 p.invalidateChild(this, tmpr); 4683 } 4684 } 4685 } 4686 4687 /** 4688 * Invalidate the whole view. If the view is visible, {@link #onDraw} will 4689 * be called at some point in the future. This must be called from a 4690 * UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 4691 */ 4692 public void invalidate() { 4693 if (ViewDebug.TRACE_HIERARCHY) { 4694 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 4695 } 4696 4697 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS)) { 4698 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 4699 final ViewParent p = mParent; 4700 final AttachInfo ai = mAttachInfo; 4701 if (p != null && ai != null) { 4702 final Rect r = ai.mTmpInvalRect; 4703 r.set(0, 0, mRight - mLeft, mBottom - mTop); 4704 // Don't call invalidate -- we don't want to internally scroll 4705 // our own bounds 4706 p.invalidateChild(this, r); 4707 } 4708 } 4709 } 4710 4711 /** 4712 * Indicates whether this View is opaque. An opaque View guarantees that it will 4713 * draw all the pixels overlapping its bounds using a fully opaque color. 4714 * 4715 * Subclasses of View should override this method whenever possible to indicate 4716 * whether an instance is opaque. Opaque Views are treated in a special way by 4717 * the View hierarchy, possibly allowing it to perform optimizations during 4718 * invalidate/draw passes. 4719 * 4720 * @return True if this View is guaranteed to be fully opaque, false otherwise. 4721 * 4722 * @hide Pending API council approval 4723 */ 4724 @ViewDebug.ExportedProperty 4725 public boolean isOpaque() { 4726 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK; 4727 } 4728 4729 private void computeOpaqueFlags() { 4730 // Opaque if: 4731 // - Has a background 4732 // - Background is opaque 4733 // - Doesn't have scrollbars or scrollbars are inside overlay 4734 4735 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 4736 mPrivateFlags |= OPAQUE_BACKGROUND; 4737 } else { 4738 mPrivateFlags &= ~OPAQUE_BACKGROUND; 4739 } 4740 4741 final int flags = mViewFlags; 4742 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 4743 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 4744 mPrivateFlags |= OPAQUE_SCROLLBARS; 4745 } else { 4746 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 4747 } 4748 } 4749 4750 /** 4751 * @hide 4752 */ 4753 protected boolean hasOpaqueScrollbars() { 4754 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 4755 } 4756 4757 /** 4758 * @return A handler associated with the thread running the View. This 4759 * handler can be used to pump events in the UI events queue. 4760 */ 4761 public Handler getHandler() { 4762 if (mAttachInfo != null) { 4763 return mAttachInfo.mHandler; 4764 } 4765 return null; 4766 } 4767 4768 /** 4769 * Causes the Runnable to be added to the message queue. 4770 * The runnable will be run on the user interface thread. 4771 * 4772 * @param action The Runnable that will be executed. 4773 * 4774 * @return Returns true if the Runnable was successfully placed in to the 4775 * message queue. Returns false on failure, usually because the 4776 * looper processing the message queue is exiting. 4777 */ 4778 public boolean post(Runnable action) { 4779 Handler handler; 4780 if (mAttachInfo != null) { 4781 handler = mAttachInfo.mHandler; 4782 } else { 4783 // Assume that post will succeed later 4784 ViewRoot.getRunQueue().post(action); 4785 return true; 4786 } 4787 4788 return handler.post(action); 4789 } 4790 4791 /** 4792 * Causes the Runnable to be added to the message queue, to be run 4793 * after the specified amount of time elapses. 4794 * The runnable will be run on the user interface thread. 4795 * 4796 * @param action The Runnable that will be executed. 4797 * @param delayMillis The delay (in milliseconds) until the Runnable 4798 * will be executed. 4799 * 4800 * @return true if the Runnable was successfully placed in to the 4801 * message queue. Returns false on failure, usually because the 4802 * looper processing the message queue is exiting. Note that a 4803 * result of true does not mean the Runnable will be processed -- 4804 * if the looper is quit before the delivery time of the message 4805 * occurs then the message will be dropped. 4806 */ 4807 public boolean postDelayed(Runnable action, long delayMillis) { 4808 Handler handler; 4809 if (mAttachInfo != null) { 4810 handler = mAttachInfo.mHandler; 4811 } else { 4812 // Assume that post will succeed later 4813 ViewRoot.getRunQueue().postDelayed(action, delayMillis); 4814 return true; 4815 } 4816 4817 return handler.postDelayed(action, delayMillis); 4818 } 4819 4820 /** 4821 * Removes the specified Runnable from the message queue. 4822 * 4823 * @param action The Runnable to remove from the message handling queue 4824 * 4825 * @return true if this view could ask the Handler to remove the Runnable, 4826 * false otherwise. When the returned value is true, the Runnable 4827 * may or may not have been actually removed from the message queue 4828 * (for instance, if the Runnable was not in the queue already.) 4829 */ 4830 public boolean removeCallbacks(Runnable action) { 4831 Handler handler; 4832 if (mAttachInfo != null) { 4833 handler = mAttachInfo.mHandler; 4834 } else { 4835 // Assume that post will succeed later 4836 ViewRoot.getRunQueue().removeCallbacks(action); 4837 return true; 4838 } 4839 4840 handler.removeCallbacks(action); 4841 return true; 4842 } 4843 4844 /** 4845 * Cause an invalidate to happen on a subsequent cycle through the event loop. 4846 * Use this to invalidate the View from a non-UI thread. 4847 * 4848 * @see #invalidate() 4849 */ 4850 public void postInvalidate() { 4851 postInvalidateDelayed(0); 4852 } 4853 4854 /** 4855 * Cause an invalidate of the specified area to happen on a subsequent cycle 4856 * through the event loop. Use this to invalidate the View from a non-UI thread. 4857 * 4858 * @param left The left coordinate of the rectangle to invalidate. 4859 * @param top The top coordinate of the rectangle to invalidate. 4860 * @param right The right coordinate of the rectangle to invalidate. 4861 * @param bottom The bottom coordinate of the rectangle to invalidate. 4862 * 4863 * @see #invalidate(int, int, int, int) 4864 * @see #invalidate(Rect) 4865 */ 4866 public void postInvalidate(int left, int top, int right, int bottom) { 4867 postInvalidateDelayed(0, left, top, right, bottom); 4868 } 4869 4870 /** 4871 * Cause an invalidate to happen on a subsequent cycle through the event 4872 * loop. Waits for the specified amount of time. 4873 * 4874 * @param delayMilliseconds the duration in milliseconds to delay the 4875 * invalidation by 4876 */ 4877 public void postInvalidateDelayed(long delayMilliseconds) { 4878 // We try only with the AttachInfo because there's no point in invalidating 4879 // if we are not attached to our window 4880 if (mAttachInfo != null) { 4881 Message msg = Message.obtain(); 4882 msg.what = AttachInfo.INVALIDATE_MSG; 4883 msg.obj = this; 4884 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 4885 } 4886 } 4887 4888 /** 4889 * Cause an invalidate of the specified area to happen on a subsequent cycle 4890 * through the event loop. Waits for the specified amount of time. 4891 * 4892 * @param delayMilliseconds the duration in milliseconds to delay the 4893 * invalidation by 4894 * @param left The left coordinate of the rectangle to invalidate. 4895 * @param top The top coordinate of the rectangle to invalidate. 4896 * @param right The right coordinate of the rectangle to invalidate. 4897 * @param bottom The bottom coordinate of the rectangle to invalidate. 4898 */ 4899 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 4900 int right, int bottom) { 4901 4902 // We try only with the AttachInfo because there's no point in invalidating 4903 // if we are not attached to our window 4904 if (mAttachInfo != null) { 4905 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 4906 info.target = this; 4907 info.left = left; 4908 info.top = top; 4909 info.right = right; 4910 info.bottom = bottom; 4911 4912 final Message msg = Message.obtain(); 4913 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 4914 msg.obj = info; 4915 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 4916 } 4917 } 4918 4919 /** 4920 * Called by a parent to request that a child update its values for mScrollX 4921 * and mScrollY if necessary. This will typically be done if the child is 4922 * animating a scroll using a {@link android.widget.Scroller Scroller} 4923 * object. 4924 */ 4925 public void computeScroll() { 4926 } 4927 4928 /** 4929 * <p>Indicate whether the horizontal edges are faded when the view is 4930 * scrolled horizontally.</p> 4931 * 4932 * @return true if the horizontal edges should are faded on scroll, false 4933 * otherwise 4934 * 4935 * @see #setHorizontalFadingEdgeEnabled(boolean) 4936 * @attr ref android.R.styleable#View_fadingEdge 4937 */ 4938 public boolean isHorizontalFadingEdgeEnabled() { 4939 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 4940 } 4941 4942 /** 4943 * <p>Define whether the horizontal edges should be faded when this view 4944 * is scrolled horizontally.</p> 4945 * 4946 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 4947 * be faded when the view is scrolled 4948 * horizontally 4949 * 4950 * @see #isHorizontalFadingEdgeEnabled() 4951 * @attr ref android.R.styleable#View_fadingEdge 4952 */ 4953 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 4954 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 4955 if (horizontalFadingEdgeEnabled) { 4956 initScrollCache(); 4957 } 4958 4959 mViewFlags ^= FADING_EDGE_HORIZONTAL; 4960 } 4961 } 4962 4963 /** 4964 * <p>Indicate whether the vertical edges are faded when the view is 4965 * scrolled horizontally.</p> 4966 * 4967 * @return true if the vertical edges should are faded on scroll, false 4968 * otherwise 4969 * 4970 * @see #setVerticalFadingEdgeEnabled(boolean) 4971 * @attr ref android.R.styleable#View_fadingEdge 4972 */ 4973 public boolean isVerticalFadingEdgeEnabled() { 4974 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 4975 } 4976 4977 /** 4978 * <p>Define whether the vertical edges should be faded when this view 4979 * is scrolled vertically.</p> 4980 * 4981 * @param verticalFadingEdgeEnabled true if the vertical edges should 4982 * be faded when the view is scrolled 4983 * vertically 4984 * 4985 * @see #isVerticalFadingEdgeEnabled() 4986 * @attr ref android.R.styleable#View_fadingEdge 4987 */ 4988 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 4989 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 4990 if (verticalFadingEdgeEnabled) { 4991 initScrollCache(); 4992 } 4993 4994 mViewFlags ^= FADING_EDGE_VERTICAL; 4995 } 4996 } 4997 4998 /** 4999 * Returns the strength, or intensity, of the top faded edge. The strength is 5000 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 5001 * returns 0.0 or 1.0 but no value in between. 5002 * 5003 * Subclasses should override this method to provide a smoother fade transition 5004 * when scrolling occurs. 5005 * 5006 * @return the intensity of the top fade as a float between 0.0f and 1.0f 5007 */ 5008 protected float getTopFadingEdgeStrength() { 5009 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 5010 } 5011 5012 /** 5013 * Returns the strength, or intensity, of the bottom faded edge. The strength is 5014 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 5015 * returns 0.0 or 1.0 but no value in between. 5016 * 5017 * Subclasses should override this method to provide a smoother fade transition 5018 * when scrolling occurs. 5019 * 5020 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 5021 */ 5022 protected float getBottomFadingEdgeStrength() { 5023 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 5024 computeVerticalScrollRange() ? 1.0f : 0.0f; 5025 } 5026 5027 /** 5028 * Returns the strength, or intensity, of the left faded edge. The strength is 5029 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 5030 * returns 0.0 or 1.0 but no value in between. 5031 * 5032 * Subclasses should override this method to provide a smoother fade transition 5033 * when scrolling occurs. 5034 * 5035 * @return the intensity of the left fade as a float between 0.0f and 1.0f 5036 */ 5037 protected float getLeftFadingEdgeStrength() { 5038 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 5039 } 5040 5041 /** 5042 * Returns the strength, or intensity, of the right faded edge. The strength is 5043 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 5044 * returns 0.0 or 1.0 but no value in between. 5045 * 5046 * Subclasses should override this method to provide a smoother fade transition 5047 * when scrolling occurs. 5048 * 5049 * @return the intensity of the right fade as a float between 0.0f and 1.0f 5050 */ 5051 protected float getRightFadingEdgeStrength() { 5052 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 5053 computeHorizontalScrollRange() ? 1.0f : 0.0f; 5054 } 5055 5056 /** 5057 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 5058 * scrollbar is not drawn by default.</p> 5059 * 5060 * @return true if the horizontal scrollbar should be painted, false 5061 * otherwise 5062 * 5063 * @see #setHorizontalScrollBarEnabled(boolean) 5064 */ 5065 public boolean isHorizontalScrollBarEnabled() { 5066 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 5067 } 5068 5069 /** 5070 * <p>Define whether the horizontal scrollbar should be drawn or not. The 5071 * scrollbar is not drawn by default.</p> 5072 * 5073 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 5074 * be painted 5075 * 5076 * @see #isHorizontalScrollBarEnabled() 5077 */ 5078 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 5079 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 5080 mViewFlags ^= SCROLLBARS_HORIZONTAL; 5081 computeOpaqueFlags(); 5082 recomputePadding(); 5083 } 5084 } 5085 5086 /** 5087 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 5088 * scrollbar is not drawn by default.</p> 5089 * 5090 * @return true if the vertical scrollbar should be painted, false 5091 * otherwise 5092 * 5093 * @see #setVerticalScrollBarEnabled(boolean) 5094 */ 5095 public boolean isVerticalScrollBarEnabled() { 5096 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 5097 } 5098 5099 /** 5100 * <p>Define whether the vertical scrollbar should be drawn or not. The 5101 * scrollbar is not drawn by default.</p> 5102 * 5103 * @param verticalScrollBarEnabled true if the vertical scrollbar should 5104 * be painted 5105 * 5106 * @see #isVerticalScrollBarEnabled() 5107 */ 5108 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 5109 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 5110 mViewFlags ^= SCROLLBARS_VERTICAL; 5111 computeOpaqueFlags(); 5112 recomputePadding(); 5113 } 5114 } 5115 5116 private void recomputePadding() { 5117 setPadding(mPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 5118 } 5119 5120 /** 5121 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 5122 * inset. When inset, they add to the padding of the view. And the scrollbars 5123 * can be drawn inside the padding area or on the edge of the view. For example, 5124 * if a view has a background drawable and you want to draw the scrollbars 5125 * inside the padding specified by the drawable, you can use 5126 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 5127 * appear at the edge of the view, ignoring the padding, then you can use 5128 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 5129 * @param style the style of the scrollbars. Should be one of 5130 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 5131 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 5132 * @see #SCROLLBARS_INSIDE_OVERLAY 5133 * @see #SCROLLBARS_INSIDE_INSET 5134 * @see #SCROLLBARS_OUTSIDE_OVERLAY 5135 * @see #SCROLLBARS_OUTSIDE_INSET 5136 */ 5137 public void setScrollBarStyle(int style) { 5138 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 5139 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 5140 computeOpaqueFlags(); 5141 recomputePadding(); 5142 } 5143 } 5144 5145 /** 5146 * <p>Returns the current scrollbar style.</p> 5147 * @return the current scrollbar style 5148 * @see #SCROLLBARS_INSIDE_OVERLAY 5149 * @see #SCROLLBARS_INSIDE_INSET 5150 * @see #SCROLLBARS_OUTSIDE_OVERLAY 5151 * @see #SCROLLBARS_OUTSIDE_INSET 5152 */ 5153 public int getScrollBarStyle() { 5154 return mViewFlags & SCROLLBARS_STYLE_MASK; 5155 } 5156 5157 /** 5158 * <p>Compute the horizontal range that the horizontal scrollbar 5159 * represents.</p> 5160 * 5161 * <p>The range is expressed in arbitrary units that must be the same as the 5162 * units used by {@link #computeHorizontalScrollExtent()} and 5163 * {@link #computeHorizontalScrollOffset()}.</p> 5164 * 5165 * <p>The default range is the drawing width of this view.</p> 5166 * 5167 * @return the total horizontal range represented by the horizontal 5168 * scrollbar 5169 * 5170 * @see #computeHorizontalScrollExtent() 5171 * @see #computeHorizontalScrollOffset() 5172 * @see android.widget.ScrollBarDrawable 5173 */ 5174 protected int computeHorizontalScrollRange() { 5175 return getWidth(); 5176 } 5177 5178 /** 5179 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 5180 * within the horizontal range. This value is used to compute the position 5181 * of the thumb within the scrollbar's track.</p> 5182 * 5183 * <p>The range is expressed in arbitrary units that must be the same as the 5184 * units used by {@link #computeHorizontalScrollRange()} and 5185 * {@link #computeHorizontalScrollExtent()}.</p> 5186 * 5187 * <p>The default offset is the scroll offset of this view.</p> 5188 * 5189 * @return the horizontal offset of the scrollbar's thumb 5190 * 5191 * @see #computeHorizontalScrollRange() 5192 * @see #computeHorizontalScrollExtent() 5193 * @see android.widget.ScrollBarDrawable 5194 */ 5195 protected int computeHorizontalScrollOffset() { 5196 return mScrollX; 5197 } 5198 5199 /** 5200 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 5201 * within the horizontal range. This value is used to compute the length 5202 * of the thumb within the scrollbar's track.</p> 5203 * 5204 * <p>The range is expressed in arbitrary units that must be the same as the 5205 * units used by {@link #computeHorizontalScrollRange()} and 5206 * {@link #computeHorizontalScrollOffset()}.</p> 5207 * 5208 * <p>The default extent is the drawing width of this view.</p> 5209 * 5210 * @return the horizontal extent of the scrollbar's thumb 5211 * 5212 * @see #computeHorizontalScrollRange() 5213 * @see #computeHorizontalScrollOffset() 5214 * @see android.widget.ScrollBarDrawable 5215 */ 5216 protected int computeHorizontalScrollExtent() { 5217 return getWidth(); 5218 } 5219 5220 /** 5221 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 5222 * 5223 * <p>The range is expressed in arbitrary units that must be the same as the 5224 * units used by {@link #computeVerticalScrollExtent()} and 5225 * {@link #computeVerticalScrollOffset()}.</p> 5226 * 5227 * @return the total vertical range represented by the vertical scrollbar 5228 * 5229 * <p>The default range is the drawing height of this view.</p> 5230 * 5231 * @see #computeVerticalScrollExtent() 5232 * @see #computeVerticalScrollOffset() 5233 * @see android.widget.ScrollBarDrawable 5234 */ 5235 protected int computeVerticalScrollRange() { 5236 return getHeight(); 5237 } 5238 5239 /** 5240 * <p>Compute the vertical offset of the vertical scrollbar's thumb 5241 * within the horizontal range. This value is used to compute the position 5242 * of the thumb within the scrollbar's track.</p> 5243 * 5244 * <p>The range is expressed in arbitrary units that must be the same as the 5245 * units used by {@link #computeVerticalScrollRange()} and 5246 * {@link #computeVerticalScrollExtent()}.</p> 5247 * 5248 * <p>The default offset is the scroll offset of this view.</p> 5249 * 5250 * @return the vertical offset of the scrollbar's thumb 5251 * 5252 * @see #computeVerticalScrollRange() 5253 * @see #computeVerticalScrollExtent() 5254 * @see android.widget.ScrollBarDrawable 5255 */ 5256 protected int computeVerticalScrollOffset() { 5257 return mScrollY; 5258 } 5259 5260 /** 5261 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 5262 * within the vertical range. This value is used to compute the length 5263 * of the thumb within the scrollbar's track.</p> 5264 * 5265 * <p>The range is expressed in arbitrary units that must be the same as the 5266 * units used by {@link #computeHorizontalScrollRange()} and 5267 * {@link #computeVerticalScrollOffset()}.</p> 5268 * 5269 * <p>The default extent is the drawing height of this view.</p> 5270 * 5271 * @return the vertical extent of the scrollbar's thumb 5272 * 5273 * @see #computeVerticalScrollRange() 5274 * @see #computeVerticalScrollOffset() 5275 * @see android.widget.ScrollBarDrawable 5276 */ 5277 protected int computeVerticalScrollExtent() { 5278 return getHeight(); 5279 } 5280 5281 /** 5282 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 5283 * scrollbars are painted only if they have been awakened first.</p> 5284 * 5285 * @param canvas the canvas on which to draw the scrollbars 5286 */ 5287 private void onDrawScrollBars(Canvas canvas) { 5288 // scrollbars are drawn only when the animation is running 5289 final ScrollabilityCache cache = mScrollCache; 5290 if (cache != null) { 5291 final int viewFlags = mViewFlags; 5292 5293 final boolean drawHorizontalScrollBar = 5294 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 5295 final boolean drawVerticalScrollBar = 5296 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 5297 && !isVerticalScrollBarHidden(); 5298 5299 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 5300 final int width = mRight - mLeft; 5301 final int height = mBottom - mTop; 5302 5303 final ScrollBarDrawable scrollBar = cache.scrollBar; 5304 int size = scrollBar.getSize(false); 5305 if (size <= 0) { 5306 size = cache.scrollBarSize; 5307 } 5308 5309 if (drawHorizontalScrollBar) { 5310 onDrawHorizontalScrollBar(canvas, scrollBar, width, height, size); 5311 } 5312 5313 if (drawVerticalScrollBar) { 5314 onDrawVerticalScrollBar(canvas, scrollBar, width, height, size); 5315 } 5316 } 5317 } 5318 } 5319 5320 /** 5321 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 5322 * FastScroller is visible. 5323 * @return whether to temporarily hide the vertical scrollbar 5324 * @hide 5325 */ 5326 protected boolean isVerticalScrollBarHidden() { 5327 return false; 5328 } 5329 5330 /** 5331 * <p>Draw the horizontal scrollbar if 5332 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 5333 * 5334 * <p>The length of the scrollbar and its thumb is computed according to the 5335 * values returned by {@link #computeHorizontalScrollRange()}, 5336 * {@link #computeHorizontalScrollExtent()} and 5337 * {@link #computeHorizontalScrollOffset()}. Refer to 5338 * {@link android.widget.ScrollBarDrawable} for more information about how 5339 * these values relate to each other.</p> 5340 * 5341 * @param canvas the canvas on which to draw the scrollbar 5342 * @param scrollBar the scrollbar's drawable 5343 * @param width the width of the drawing surface 5344 * @param height the height of the drawing surface 5345 * @param size the size of the scrollbar 5346 * 5347 * @see #isHorizontalScrollBarEnabled() 5348 * @see #computeHorizontalScrollRange() 5349 * @see #computeHorizontalScrollExtent() 5350 * @see #computeHorizontalScrollOffset() 5351 * @see android.widget.ScrollBarDrawable 5352 */ 5353 private void onDrawHorizontalScrollBar(Canvas canvas, ScrollBarDrawable scrollBar, int width, 5354 int height, int size) { 5355 5356 final int viewFlags = mViewFlags; 5357 final int scrollX = mScrollX; 5358 final int scrollY = mScrollY; 5359 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 5360 final int top = scrollY + height - size - (mUserPaddingBottom & inside); 5361 5362 final int verticalScrollBarGap = 5363 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL ? 5364 getVerticalScrollbarWidth() : 0; 5365 5366 scrollBar.setBounds(scrollX + (mPaddingLeft & inside), top, 5367 scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap, top + size); 5368 scrollBar.setParameters( 5369 computeHorizontalScrollRange(), 5370 computeHorizontalScrollOffset(), 5371 computeHorizontalScrollExtent(), false); 5372 scrollBar.draw(canvas); 5373 } 5374 5375 /** 5376 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 5377 * returns true.</p> 5378 * 5379 * <p>The length of the scrollbar and its thumb is computed according to the 5380 * values returned by {@link #computeVerticalScrollRange()}, 5381 * {@link #computeVerticalScrollExtent()} and 5382 * {@link #computeVerticalScrollOffset()}. Refer to 5383 * {@link android.widget.ScrollBarDrawable} for more information about how 5384 * these values relate to each other.</p> 5385 * 5386 * @param canvas the canvas on which to draw the scrollbar 5387 * @param scrollBar the scrollbar's drawable 5388 * @param width the width of the drawing surface 5389 * @param height the height of the drawing surface 5390 * @param size the size of the scrollbar 5391 * 5392 * @see #isVerticalScrollBarEnabled() 5393 * @see #computeVerticalScrollRange() 5394 * @see #computeVerticalScrollExtent() 5395 * @see #computeVerticalScrollOffset() 5396 * @see android.widget.ScrollBarDrawable 5397 */ 5398 private void onDrawVerticalScrollBar(Canvas canvas, ScrollBarDrawable scrollBar, int width, 5399 int height, int size) { 5400 5401 final int scrollX = mScrollX; 5402 final int scrollY = mScrollY; 5403 final int inside = (mViewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 5404 // TODO: Deal with RTL languages to position scrollbar on left 5405 final int left = scrollX + width - size - (mUserPaddingRight & inside); 5406 5407 scrollBar.setBounds(left, scrollY + (mPaddingTop & inside), 5408 left + size, scrollY + height - (mUserPaddingBottom & inside)); 5409 scrollBar.setParameters( 5410 computeVerticalScrollRange(), 5411 computeVerticalScrollOffset(), 5412 computeVerticalScrollExtent(), true); 5413 scrollBar.draw(canvas); 5414 } 5415 5416 /** 5417 * Implement this to do your drawing. 5418 * 5419 * @param canvas the canvas on which the background will be drawn 5420 */ 5421 protected void onDraw(Canvas canvas) { 5422 } 5423 5424 /* 5425 * Caller is responsible for calling requestLayout if necessary. 5426 * (This allows addViewInLayout to not request a new layout.) 5427 */ 5428 void assignParent(ViewParent parent) { 5429 if (mParent == null) { 5430 mParent = parent; 5431 } else if (parent == null) { 5432 mParent = null; 5433 } else { 5434 throw new RuntimeException("view " + this + " being added, but" 5435 + " it already has a parent"); 5436 } 5437 } 5438 5439 /** 5440 * This is called when the view is attached to a window. At this point it 5441 * has a Surface and will start drawing. Note that this function is 5442 * guaranteed to be called before {@link #onDraw}, however it may be called 5443 * any time before the first onDraw -- including before or after 5444 * {@link #onMeasure}. 5445 * 5446 * @see #onDetachedFromWindow() 5447 */ 5448 protected void onAttachedToWindow() { 5449 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 5450 mParent.requestTransparentRegion(this); 5451 } 5452 } 5453 5454 /** 5455 * This is called when the view is detached from a window. At this point it 5456 * no longer has a surface for drawing. 5457 * 5458 * @see #onAttachedToWindow() 5459 */ 5460 protected void onDetachedFromWindow() { 5461 if (mPendingCheckForLongPress != null) { 5462 removeCallbacks(mPendingCheckForLongPress); 5463 } 5464 destroyDrawingCache(); 5465 } 5466 5467 /** 5468 * @return The number of times this view has been attached to a window 5469 */ 5470 protected int getWindowAttachCount() { 5471 return mWindowAttachCount; 5472 } 5473 5474 /** 5475 * Retrieve a unique token identifying the window this view is attached to. 5476 * @return Return the window's token for use in 5477 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 5478 */ 5479 public IBinder getWindowToken() { 5480 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 5481 } 5482 5483 /** 5484 * Retrieve a unique token identifying the top-level "real" window of 5485 * the window that this view is attached to. That is, this is like 5486 * {@link #getWindowToken}, except if the window this view in is a panel 5487 * window (attached to another containing window), then the token of 5488 * the containing window is returned instead. 5489 * 5490 * @return Returns the associated window token, either 5491 * {@link #getWindowToken()} or the containing window's token. 5492 */ 5493 public IBinder getApplicationWindowToken() { 5494 AttachInfo ai = mAttachInfo; 5495 if (ai != null) { 5496 IBinder appWindowToken = ai.mPanelParentWindowToken; 5497 if (appWindowToken == null) { 5498 appWindowToken = ai.mWindowToken; 5499 } 5500 return appWindowToken; 5501 } 5502 return null; 5503 } 5504 5505 /** 5506 * Retrieve private session object this view hierarchy is using to 5507 * communicate with the window manager. 5508 * @return the session object to communicate with the window manager 5509 */ 5510 /*package*/ IWindowSession getWindowSession() { 5511 return mAttachInfo != null ? mAttachInfo.mSession : null; 5512 } 5513 5514 /** 5515 * @param info the {@link android.view.View.AttachInfo} to associated with 5516 * this view 5517 */ 5518 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 5519 //System.out.println("Attached! " + this); 5520 mAttachInfo = info; 5521 mWindowAttachCount++; 5522 if (mFloatingTreeObserver != null) { 5523 info.mTreeObserver.merge(mFloatingTreeObserver); 5524 mFloatingTreeObserver = null; 5525 } 5526 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 5527 mAttachInfo.mScrollContainers.add(this); 5528 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 5529 } 5530 performCollectViewAttributes(visibility); 5531 onAttachedToWindow(); 5532 int vis = info.mWindowVisibility; 5533 if (vis != GONE) { 5534 onWindowVisibilityChanged(vis); 5535 } 5536 } 5537 5538 void dispatchDetachedFromWindow() { 5539 //System.out.println("Detached! " + this); 5540 AttachInfo info = mAttachInfo; 5541 if (info != null) { 5542 int vis = info.mWindowVisibility; 5543 if (vis != GONE) { 5544 onWindowVisibilityChanged(GONE); 5545 } 5546 } 5547 5548 onDetachedFromWindow(); 5549 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 5550 mAttachInfo.mScrollContainers.remove(this); 5551 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 5552 } 5553 mAttachInfo = null; 5554 } 5555 5556 /** 5557 * Store this view hierarchy's frozen state into the given container. 5558 * 5559 * @param container The SparseArray in which to save the view's state. 5560 * 5561 * @see #restoreHierarchyState 5562 * @see #dispatchSaveInstanceState 5563 * @see #onSaveInstanceState 5564 */ 5565 public void saveHierarchyState(SparseArray<Parcelable> container) { 5566 dispatchSaveInstanceState(container); 5567 } 5568 5569 /** 5570 * Called by {@link #saveHierarchyState} to store the state for this view and its children. 5571 * May be overridden to modify how freezing happens to a view's children; for example, some 5572 * views may want to not store state for their children. 5573 * 5574 * @param container The SparseArray in which to save the view's state. 5575 * 5576 * @see #dispatchRestoreInstanceState 5577 * @see #saveHierarchyState 5578 * @see #onSaveInstanceState 5579 */ 5580 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 5581 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 5582 mPrivateFlags &= ~SAVE_STATE_CALLED; 5583 Parcelable state = onSaveInstanceState(); 5584 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 5585 throw new IllegalStateException( 5586 "Derived class did not call super.onSaveInstanceState()"); 5587 } 5588 if (state != null) { 5589 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 5590 // + ": " + state); 5591 container.put(mID, state); 5592 } 5593 } 5594 } 5595 5596 /** 5597 * Hook allowing a view to generate a representation of its internal state 5598 * that can later be used to create a new instance with that same state. 5599 * This state should only contain information that is not persistent or can 5600 * not be reconstructed later. For example, you will never store your 5601 * current position on screen because that will be computed again when a 5602 * new instance of the view is placed in its view hierarchy. 5603 * <p> 5604 * Some examples of things you may store here: the current cursor position 5605 * in a text view (but usually not the text itself since that is stored in a 5606 * content provider or other persistent storage), the currently selected 5607 * item in a list view. 5608 * 5609 * @return Returns a Parcelable object containing the view's current dynamic 5610 * state, or null if there is nothing interesting to save. The 5611 * default implementation returns null. 5612 * @see #onRestoreInstanceState 5613 * @see #saveHierarchyState 5614 * @see #dispatchSaveInstanceState 5615 * @see #setSaveEnabled(boolean) 5616 */ 5617 protected Parcelable onSaveInstanceState() { 5618 mPrivateFlags |= SAVE_STATE_CALLED; 5619 return BaseSavedState.EMPTY_STATE; 5620 } 5621 5622 /** 5623 * Restore this view hierarchy's frozen state from the given container. 5624 * 5625 * @param container The SparseArray which holds previously frozen states. 5626 * 5627 * @see #saveHierarchyState 5628 * @see #dispatchRestoreInstanceState 5629 * @see #onRestoreInstanceState 5630 */ 5631 public void restoreHierarchyState(SparseArray<Parcelable> container) { 5632 dispatchRestoreInstanceState(container); 5633 } 5634 5635 /** 5636 * Called by {@link #restoreHierarchyState} to retrieve the state for this view and its 5637 * children. May be overridden to modify how restoreing happens to a view's children; for 5638 * example, some views may want to not store state for their children. 5639 * 5640 * @param container The SparseArray which holds previously saved state. 5641 * 5642 * @see #dispatchSaveInstanceState 5643 * @see #restoreHierarchyState 5644 * @see #onRestoreInstanceState 5645 */ 5646 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 5647 if (mID != NO_ID) { 5648 Parcelable state = container.get(mID); 5649 if (state != null) { 5650 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 5651 // + ": " + state); 5652 mPrivateFlags &= ~SAVE_STATE_CALLED; 5653 onRestoreInstanceState(state); 5654 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 5655 throw new IllegalStateException( 5656 "Derived class did not call super.onRestoreInstanceState()"); 5657 } 5658 } 5659 } 5660 } 5661 5662 /** 5663 * Hook allowing a view to re-apply a representation of its internal state that had previously 5664 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 5665 * null state. 5666 * 5667 * @param state The frozen state that had previously been returned by 5668 * {@link #onSaveInstanceState}. 5669 * 5670 * @see #onSaveInstanceState 5671 * @see #restoreHierarchyState 5672 * @see #dispatchRestoreInstanceState 5673 */ 5674 protected void onRestoreInstanceState(Parcelable state) { 5675 mPrivateFlags |= SAVE_STATE_CALLED; 5676 if (state != BaseSavedState.EMPTY_STATE && state != null) { 5677 throw new IllegalArgumentException("Wrong state class -- expecting View State"); 5678 } 5679 } 5680 5681 /** 5682 * <p>Return the time at which the drawing of the view hierarchy started.</p> 5683 * 5684 * @return the drawing start time in milliseconds 5685 */ 5686 public long getDrawingTime() { 5687 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 5688 } 5689 5690 /** 5691 * <p>Enables or disables the duplication of the parent's state into this view. When 5692 * duplication is enabled, this view gets its drawable state from its parent rather 5693 * than from its own internal properties.</p> 5694 * 5695 * <p>Note: in the current implementation, setting this property to true after the 5696 * view was added to a ViewGroup might have no effect at all. This property should 5697 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 5698 * 5699 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 5700 * property is enabled, an exception will be thrown.</p> 5701 * 5702 * @param enabled True to enable duplication of the parent's drawable state, false 5703 * to disable it. 5704 * 5705 * @see #getDrawableState() 5706 * @see #isDuplicateParentStateEnabled() 5707 */ 5708 public void setDuplicateParentStateEnabled(boolean enabled) { 5709 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 5710 } 5711 5712 /** 5713 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 5714 * 5715 * @return True if this view's drawable state is duplicated from the parent, 5716 * false otherwise 5717 * 5718 * @see #getDrawableState() 5719 * @see #setDuplicateParentStateEnabled(boolean) 5720 */ 5721 public boolean isDuplicateParentStateEnabled() { 5722 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 5723 } 5724 5725 /** 5726 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 5727 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 5728 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 5729 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 5730 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 5731 * null.</p> 5732 * 5733 * @param enabled true to enable the drawing cache, false otherwise 5734 * 5735 * @see #isDrawingCacheEnabled() 5736 * @see #getDrawingCache() 5737 * @see #buildDrawingCache() 5738 */ 5739 public void setDrawingCacheEnabled(boolean enabled) { 5740 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 5741 } 5742 5743 /** 5744 * <p>Indicates whether the drawing cache is enabled for this view.</p> 5745 * 5746 * @return true if the drawing cache is enabled 5747 * 5748 * @see #setDrawingCacheEnabled(boolean) 5749 * @see #getDrawingCache() 5750 */ 5751 @ViewDebug.ExportedProperty 5752 public boolean isDrawingCacheEnabled() { 5753 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 5754 } 5755 5756 /** 5757 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 5758 * is null when caching is disabled. If caching is enabled and the cache is not ready, 5759 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 5760 * draw from the cache when the cache is enabled. To benefit from the cache, you must 5761 * request the drawing cache by calling this method and draw it on screen if the 5762 * returned bitmap is not null.</p> 5763 * 5764 * @return a bitmap representing this view or null if cache is disabled 5765 * 5766 * @see #setDrawingCacheEnabled(boolean) 5767 * @see #isDrawingCacheEnabled() 5768 * @see #buildDrawingCache() 5769 * @see #destroyDrawingCache() 5770 */ 5771 public Bitmap getDrawingCache() { 5772 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 5773 return null; 5774 } 5775 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 5776 buildDrawingCache(); 5777 } 5778 return mDrawingCache == null ? null : mDrawingCache.get(); 5779 } 5780 5781 /** 5782 * <p>Frees the resources used by the drawing cache. If you call 5783 * {@link #buildDrawingCache()} manually without calling 5784 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 5785 * should cleanup the cache with this method afterwards.</p> 5786 * 5787 * @see #setDrawingCacheEnabled(boolean) 5788 * @see #buildDrawingCache() 5789 * @see #getDrawingCache() 5790 */ 5791 public void destroyDrawingCache() { 5792 if (mDrawingCache != null) { 5793 final Bitmap bitmap = mDrawingCache.get(); 5794 if (bitmap != null) bitmap.recycle(); 5795 mDrawingCache = null; 5796 } 5797 } 5798 5799 /** 5800 * Setting a solid background color for the drawing cache's bitmaps will improve 5801 * perfromance and memory usage. Note, though that this should only be used if this 5802 * view will always be drawn on top of a solid color. 5803 * 5804 * @param color The background color to use for the drawing cache's bitmap 5805 * 5806 * @see #setDrawingCacheEnabled(boolean) 5807 * @see #buildDrawingCache() 5808 * @see #getDrawingCache() 5809 */ 5810 public void setDrawingCacheBackgroundColor(int color) { 5811 mDrawingCacheBackgroundColor = color; 5812 } 5813 5814 /** 5815 * @see #setDrawingCacheBackgroundColor(int) 5816 * 5817 * @return The background color to used for the drawing cache's bitmap 5818 */ 5819 public int getDrawingCacheBackgroundColor() { 5820 return mDrawingCacheBackgroundColor; 5821 } 5822 5823 /** 5824 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 5825 * 5826 * <p>If you call {@link #buildDrawingCache()} manually without calling 5827 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 5828 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 5829 * 5830 * @see #getDrawingCache() 5831 * @see #destroyDrawingCache() 5832 */ 5833 public void buildDrawingCache() { 5834 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mDrawingCache == null || 5835 mDrawingCache.get() == null) { 5836 5837 if (ViewDebug.TRACE_HIERARCHY) { 5838 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 5839 } 5840 if (Config.DEBUG && ViewDebug.profileDrawing) { 5841 EventLog.writeEvent(60002, hashCode()); 5842 } 5843 5844 final int width = mRight - mLeft; 5845 final int height = mBottom - mTop; 5846 5847 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 5848 final boolean opaque = drawingCacheBackgroundColor != 0 || 5849 (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE); 5850 5851 if (width <= 0 || height <= 0 || 5852 (width * height * (opaque ? 2 : 4) > // Projected bitmap size in bytes 5853 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 5854 destroyDrawingCache(); 5855 return; 5856 } 5857 5858 boolean clear = true; 5859 Bitmap bitmap = mDrawingCache == null ? null : mDrawingCache.get(); 5860 5861 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 5862 5863 Bitmap.Config quality; 5864 if (!opaque) { 5865 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 5866 case DRAWING_CACHE_QUALITY_AUTO: 5867 quality = Bitmap.Config.ARGB_8888; 5868 break; 5869 case DRAWING_CACHE_QUALITY_LOW: 5870 quality = Bitmap.Config.ARGB_4444; 5871 break; 5872 case DRAWING_CACHE_QUALITY_HIGH: 5873 quality = Bitmap.Config.ARGB_8888; 5874 break; 5875 default: 5876 quality = Bitmap.Config.ARGB_8888; 5877 break; 5878 } 5879 } else { 5880 quality = Bitmap.Config.RGB_565; 5881 } 5882 5883 // Try to cleanup memory 5884 if (bitmap != null) bitmap.recycle(); 5885 5886 try { 5887 bitmap = Bitmap.createBitmap(width, height, quality); 5888 mDrawingCache = new SoftReference<Bitmap>(bitmap); 5889 } catch (OutOfMemoryError e) { 5890 // If there is not enough memory to create the bitmap cache, just 5891 // ignore the issue as bitmap caches are not required to draw the 5892 // view hierarchy 5893 mDrawingCache = null; 5894 return; 5895 } 5896 5897 clear = drawingCacheBackgroundColor != 0; 5898 } 5899 5900 Canvas canvas; 5901 final AttachInfo attachInfo = mAttachInfo; 5902 if (attachInfo != null) { 5903 canvas = attachInfo.mCanvas; 5904 if (canvas == null) { 5905 canvas = new Canvas(); 5906 } 5907 canvas.setBitmap(bitmap); 5908 // Temporarily clobber the cached Canvas in case one of our children 5909 // is also using a drawing cache. Without this, the children would 5910 // steal the canvas by attaching their own bitmap to it and bad, bad 5911 // thing would happen (invisible views, corrupted drawings, etc.) 5912 attachInfo.mCanvas = null; 5913 } else { 5914 // This case should hopefully never or seldom happen 5915 canvas = new Canvas(bitmap); 5916 } 5917 5918 if (clear) { 5919 bitmap.eraseColor(drawingCacheBackgroundColor); 5920 } 5921 5922 computeScroll(); 5923 final int restoreCount = canvas.save(); 5924 canvas.translate(-mScrollX, -mScrollY); 5925 5926 mPrivateFlags |= DRAWN; 5927 5928 // Fast path for layouts with no backgrounds 5929 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 5930 if (ViewDebug.TRACE_HIERARCHY) { 5931 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 5932 } 5933 mPrivateFlags &= ~DIRTY_MASK; 5934 dispatchDraw(canvas); 5935 } else { 5936 draw(canvas); 5937 } 5938 5939 canvas.restoreToCount(restoreCount); 5940 5941 if (attachInfo != null) { 5942 // Restore the cached Canvas for our siblings 5943 attachInfo.mCanvas = canvas; 5944 } 5945 mPrivateFlags |= DRAWING_CACHE_VALID; 5946 } 5947 } 5948 5949 /** 5950 * Create a snapshot of the view into a bitmap. We should probably make 5951 * some form of this public, but should think about the API. 5952 */ 5953 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor) { 5954 final int width = mRight - mLeft; 5955 final int height = mBottom - mTop; 5956 5957 Bitmap bitmap = Bitmap.createBitmap(width, height, quality); 5958 if (bitmap == null) { 5959 throw new OutOfMemoryError(); 5960 } 5961 5962 Canvas canvas; 5963 final AttachInfo attachInfo = mAttachInfo; 5964 if (attachInfo != null) { 5965 canvas = attachInfo.mCanvas; 5966 if (canvas == null) { 5967 canvas = new Canvas(); 5968 } 5969 canvas.setBitmap(bitmap); 5970 // Temporarily clobber the cached Canvas in case one of our children 5971 // is also using a drawing cache. Without this, the children would 5972 // steal the canvas by attaching their own bitmap to it and bad, bad 5973 // things would happen (invisible views, corrupted drawings, etc.) 5974 attachInfo.mCanvas = null; 5975 } else { 5976 // This case should hopefully never or seldom happen 5977 canvas = new Canvas(bitmap); 5978 } 5979 5980 if ((backgroundColor & 0xff000000) != 0) { 5981 bitmap.eraseColor(backgroundColor); 5982 } 5983 5984 computeScroll(); 5985 final int restoreCount = canvas.save(); 5986 canvas.translate(-mScrollX, -mScrollY); 5987 5988 // Temporarily remove the dirty mask 5989 int flags = mPrivateFlags; 5990 mPrivateFlags &= ~DIRTY_MASK; 5991 5992 // Fast path for layouts with no backgrounds 5993 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 5994 dispatchDraw(canvas); 5995 } else { 5996 draw(canvas); 5997 } 5998 5999 mPrivateFlags = flags; 6000 6001 canvas.restoreToCount(restoreCount); 6002 6003 if (attachInfo != null) { 6004 // Restore the cached Canvas for our siblings 6005 attachInfo.mCanvas = canvas; 6006 } 6007 6008 return bitmap; 6009 } 6010 6011 /** 6012 * Indicates whether this View is currently in edit mode. A View is usually 6013 * in edit mode when displayed within a developer tool. For instance, if 6014 * this View is being drawn by a visual user interface builder, this method 6015 * should return true. 6016 * 6017 * Subclasses should check the return value of this method to provide 6018 * different behaviors if their normal behavior might interfere with the 6019 * host environment. For instance: the class spawns a thread in its 6020 * constructor, the drawing code relies on device-specific features, etc. 6021 * 6022 * This method is usually checked in the drawing code of custom widgets. 6023 * 6024 * @return True if this View is in edit mode, false otherwise. 6025 */ 6026 public boolean isInEditMode() { 6027 return false; 6028 } 6029 6030 /** 6031 * If the View draws content inside its padding and enables fading edges, 6032 * it needs to support padding offsets. Padding offsets are added to the 6033 * fading edges to extend the length of the fade so that it covers pixels 6034 * drawn inside the padding. 6035 * 6036 * Subclasses of this class should override this method if they need 6037 * to draw content inside the padding. 6038 * 6039 * @return True if padding offset must be applied, false otherwise. 6040 * 6041 * @see #getLeftPaddingOffset() 6042 * @see #getRightPaddingOffset() 6043 * @see #getTopPaddingOffset() 6044 * @see #getBottomPaddingOffset() 6045 * 6046 * @since CURRENT 6047 */ 6048 protected boolean isPaddingOffsetRequired() { 6049 return false; 6050 } 6051 6052 /** 6053 * Amount by which to extend the left fading region. Called only when 6054 * {@link #isPaddingOffsetRequired()} returns true. 6055 * 6056 * @return The left padding offset in pixels. 6057 * 6058 * @see #isPaddingOffsetRequired() 6059 * 6060 * @since CURRENT 6061 */ 6062 protected int getLeftPaddingOffset() { 6063 return 0; 6064 } 6065 6066 /** 6067 * Amount by which to extend the right fading region. Called only when 6068 * {@link #isPaddingOffsetRequired()} returns true. 6069 * 6070 * @return The right padding offset in pixels. 6071 * 6072 * @see #isPaddingOffsetRequired() 6073 * 6074 * @since CURRENT 6075 */ 6076 protected int getRightPaddingOffset() { 6077 return 0; 6078 } 6079 6080 /** 6081 * Amount by which to extend the top fading region. Called only when 6082 * {@link #isPaddingOffsetRequired()} returns true. 6083 * 6084 * @return The top padding offset in pixels. 6085 * 6086 * @see #isPaddingOffsetRequired() 6087 * 6088 * @since CURRENT 6089 */ 6090 protected int getTopPaddingOffset() { 6091 return 0; 6092 } 6093 6094 /** 6095 * Amount by which to extend the bottom fading region. Called only when 6096 * {@link #isPaddingOffsetRequired()} returns true. 6097 * 6098 * @return The bottom padding offset in pixels. 6099 * 6100 * @see #isPaddingOffsetRequired() 6101 * 6102 * @since CURRENT 6103 */ 6104 protected int getBottomPaddingOffset() { 6105 return 0; 6106 } 6107 6108 /** 6109 * Manually render this view (and all of its children) to the given Canvas. 6110 * The view must have already done a full layout before this function is 6111 * called. When implementing a view, do not override this method; instead, 6112 * you should implement {@link #onDraw}. 6113 * 6114 * @param canvas The Canvas to which the View is rendered. 6115 */ 6116 public void draw(Canvas canvas) { 6117 if (ViewDebug.TRACE_HIERARCHY) { 6118 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 6119 } 6120 6121 final int privateFlags = mPrivateFlags; 6122 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 6123 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 6124 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 6125 6126 /* 6127 * Draw traversal performs several drawing steps which must be executed 6128 * in the appropriate order: 6129 * 6130 * 1. Draw the background 6131 * 2. If necessary, save the canvas' layers to prepare for fading 6132 * 3. Draw view's content 6133 * 4. Draw children 6134 * 5. If necessary, draw the fading edges and restore layers 6135 * 6. Draw decorations (scrollbars for instance) 6136 */ 6137 6138 // Step 1, draw the background, if needed 6139 int saveCount; 6140 6141 if (!dirtyOpaque) { 6142 final Drawable background = mBGDrawable; 6143 if (background != null) { 6144 final int scrollX = mScrollX; 6145 final int scrollY = mScrollY; 6146 6147 if (mBackgroundSizeChanged) { 6148 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 6149 mBackgroundSizeChanged = false; 6150 } 6151 6152 if ((scrollX | scrollY) == 0) { 6153 background.draw(canvas); 6154 } else { 6155 canvas.translate(scrollX, scrollY); 6156 background.draw(canvas); 6157 canvas.translate(-scrollX, -scrollY); 6158 } 6159 } 6160 } 6161 6162 // skip step 2 & 5 if possible (common case) 6163 final int viewFlags = mViewFlags; 6164 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 6165 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 6166 if (!verticalEdges && !horizontalEdges) { 6167 // Step 3, draw the content 6168 if (!dirtyOpaque) onDraw(canvas); 6169 6170 // Step 4, draw the children 6171 dispatchDraw(canvas); 6172 6173 // Step 6, draw decorations (scrollbars) 6174 onDrawScrollBars(canvas); 6175 6176 // we're done... 6177 return; 6178 } 6179 6180 /* 6181 * Here we do the full fledged routine... 6182 * (this is an uncommon case where speed matters less, 6183 * this is why we repeat some of the tests that have been 6184 * done above) 6185 */ 6186 6187 boolean drawTop = false; 6188 boolean drawBottom = false; 6189 boolean drawLeft = false; 6190 boolean drawRight = false; 6191 6192 float topFadeStrength = 0.0f; 6193 float bottomFadeStrength = 0.0f; 6194 float leftFadeStrength = 0.0f; 6195 float rightFadeStrength = 0.0f; 6196 6197 // Step 2, save the canvas' layers 6198 int paddingLeft = mPaddingLeft; 6199 int paddingTop = mPaddingTop; 6200 6201 final boolean offsetRequired = isPaddingOffsetRequired(); 6202 if (offsetRequired) { 6203 paddingLeft += getLeftPaddingOffset(); 6204 paddingTop += getTopPaddingOffset(); 6205 } 6206 6207 int left = mScrollX + paddingLeft; 6208 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 6209 int top = mScrollY + paddingTop; 6210 int bottom = top + mBottom - mTop - mPaddingBottom - paddingTop; 6211 6212 if (offsetRequired) { 6213 right += getRightPaddingOffset(); 6214 bottom += getBottomPaddingOffset(); 6215 } 6216 6217 final ScrollabilityCache scrollabilityCache = mScrollCache; 6218 int length = scrollabilityCache.fadingEdgeLength; 6219 6220 // clip the fade length if top and bottom fades overlap 6221 // overlapping fades produce odd-looking artifacts 6222 if (verticalEdges && (top + length > bottom - length)) { 6223 length = (bottom - top) / 2; 6224 } 6225 6226 // also clip horizontal fades if necessary 6227 if (horizontalEdges && (left + length > right - length)) { 6228 length = (right - left) / 2; 6229 } 6230 6231 if (verticalEdges) { 6232 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 6233 drawTop = topFadeStrength >= 0.0f; 6234 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 6235 drawBottom = bottomFadeStrength >= 0.0f; 6236 } 6237 6238 if (horizontalEdges) { 6239 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 6240 drawLeft = leftFadeStrength >= 0.0f; 6241 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 6242 drawRight = rightFadeStrength >= 0.0f; 6243 } 6244 6245 saveCount = canvas.getSaveCount(); 6246 6247 int solidColor = getSolidColor(); 6248 if (solidColor == 0) { 6249 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 6250 6251 if (drawTop) { 6252 canvas.saveLayer(left, top, right, top + length, null, flags); 6253 } 6254 6255 if (drawBottom) { 6256 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 6257 } 6258 6259 if (drawLeft) { 6260 canvas.saveLayer(left, top, left + length, bottom, null, flags); 6261 } 6262 6263 if (drawRight) { 6264 canvas.saveLayer(right - length, top, right, bottom, null, flags); 6265 } 6266 } else { 6267 scrollabilityCache.setFadeColor(solidColor); 6268 } 6269 6270 // Step 3, draw the content 6271 if (!dirtyOpaque) onDraw(canvas); 6272 6273 // Step 4, draw the children 6274 dispatchDraw(canvas); 6275 6276 // Step 5, draw the fade effect and restore layers 6277 final Paint p = scrollabilityCache.paint; 6278 final Matrix matrix = scrollabilityCache.matrix; 6279 final Shader fade = scrollabilityCache.shader; 6280 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 6281 6282 if (drawTop) { 6283 matrix.setScale(1, fadeHeight * topFadeStrength); 6284 matrix.postTranslate(left, top); 6285 fade.setLocalMatrix(matrix); 6286 canvas.drawRect(left, top, right, top + length, p); 6287 } 6288 6289 if (drawBottom) { 6290 matrix.setScale(1, fadeHeight * bottomFadeStrength); 6291 matrix.postRotate(180); 6292 matrix.postTranslate(left, bottom); 6293 fade.setLocalMatrix(matrix); 6294 canvas.drawRect(left, bottom - length, right, bottom, p); 6295 } 6296 6297 if (drawLeft) { 6298 matrix.setScale(1, fadeHeight * leftFadeStrength); 6299 matrix.postRotate(-90); 6300 matrix.postTranslate(left, top); 6301 fade.setLocalMatrix(matrix); 6302 canvas.drawRect(left, top, left + length, bottom, p); 6303 } 6304 6305 if (drawRight) { 6306 matrix.setScale(1, fadeHeight * rightFadeStrength); 6307 matrix.postRotate(90); 6308 matrix.postTranslate(right, top); 6309 fade.setLocalMatrix(matrix); 6310 canvas.drawRect(right - length, top, right, bottom, p); 6311 } 6312 6313 canvas.restoreToCount(saveCount); 6314 6315 // Step 6, draw decorations (scrollbars) 6316 onDrawScrollBars(canvas); 6317 } 6318 6319 /** 6320 * Override this if your view is known to always be drawn on top of a solid color background, 6321 * and needs to draw fading edges. Returning a non-zero color enables the view system to 6322 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 6323 * should be set to 0xFF. 6324 * 6325 * @see #setVerticalFadingEdgeEnabled 6326 * @see #setHorizontalFadingEdgeEnabled 6327 * 6328 * @return The known solid color background for this view, or 0 if the color may vary 6329 */ 6330 public int getSolidColor() { 6331 return 0; 6332 } 6333 6334 /** 6335 * Build a human readable string representation of the specified view flags. 6336 * 6337 * @param flags the view flags to convert to a string 6338 * @return a String representing the supplied flags 6339 */ 6340 private static String printFlags(int flags) { 6341 String output = ""; 6342 int numFlags = 0; 6343 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 6344 output += "TAKES_FOCUS"; 6345 numFlags++; 6346 } 6347 6348 switch (flags & VISIBILITY_MASK) { 6349 case INVISIBLE: 6350 if (numFlags > 0) { 6351 output += " "; 6352 } 6353 output += "INVISIBLE"; 6354 // USELESS HERE numFlags++; 6355 break; 6356 case GONE: 6357 if (numFlags > 0) { 6358 output += " "; 6359 } 6360 output += "GONE"; 6361 // USELESS HERE numFlags++; 6362 break; 6363 default: 6364 break; 6365 } 6366 return output; 6367 } 6368 6369 /** 6370 * Build a human readable string representation of the specified private 6371 * view flags. 6372 * 6373 * @param privateFlags the private view flags to convert to a string 6374 * @return a String representing the supplied flags 6375 */ 6376 private static String printPrivateFlags(int privateFlags) { 6377 String output = ""; 6378 int numFlags = 0; 6379 6380 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 6381 output += "WANTS_FOCUS"; 6382 numFlags++; 6383 } 6384 6385 if ((privateFlags & FOCUSED) == FOCUSED) { 6386 if (numFlags > 0) { 6387 output += " "; 6388 } 6389 output += "FOCUSED"; 6390 numFlags++; 6391 } 6392 6393 if ((privateFlags & SELECTED) == SELECTED) { 6394 if (numFlags > 0) { 6395 output += " "; 6396 } 6397 output += "SELECTED"; 6398 numFlags++; 6399 } 6400 6401 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 6402 if (numFlags > 0) { 6403 output += " "; 6404 } 6405 output += "IS_ROOT_NAMESPACE"; 6406 numFlags++; 6407 } 6408 6409 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 6410 if (numFlags > 0) { 6411 output += " "; 6412 } 6413 output += "HAS_BOUNDS"; 6414 numFlags++; 6415 } 6416 6417 if ((privateFlags & DRAWN) == DRAWN) { 6418 if (numFlags > 0) { 6419 output += " "; 6420 } 6421 output += "DRAWN"; 6422 // USELESS HERE numFlags++; 6423 } 6424 return output; 6425 } 6426 6427 /** 6428 * <p>Indicates whether or not this view's layout will be requested during 6429 * the next hierarchy layout pass.</p> 6430 * 6431 * @return true if the layout will be forced during next layout pass 6432 */ 6433 public boolean isLayoutRequested() { 6434 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 6435 } 6436 6437 /** 6438 * Assign a size and position to a view and all of its 6439 * descendants 6440 * 6441 * <p>This is the second phase of the layout mechanism. 6442 * (The first is measuring). In this phase, each parent calls 6443 * layout on all of its children to position them. 6444 * This is typically done using the child measurements 6445 * that were stored in the measure pass(). 6446 * 6447 * Derived classes with children should override 6448 * onLayout. In that method, they should 6449 * call layout on each of their their children. 6450 * 6451 * @param l Left position, relative to parent 6452 * @param t Top position, relative to parent 6453 * @param r Right position, relative to parent 6454 * @param b Bottom position, relative to parent 6455 */ 6456 public final void layout(int l, int t, int r, int b) { 6457 boolean changed = setFrame(l, t, r, b); 6458 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 6459 if (ViewDebug.TRACE_HIERARCHY) { 6460 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 6461 } 6462 6463 onLayout(changed, l, t, r, b); 6464 mPrivateFlags &= ~LAYOUT_REQUIRED; 6465 } 6466 mPrivateFlags &= ~FORCE_LAYOUT; 6467 } 6468 6469 /** 6470 * Called from layout when this view should 6471 * assign a size and position to each of its children. 6472 * 6473 * Derived classes with children should override 6474 * this method and call layout on each of 6475 * their their children. 6476 * @param changed This is a new size or position for this view 6477 * @param left Left position, relative to parent 6478 * @param top Top position, relative to parent 6479 * @param right Right position, relative to parent 6480 * @param bottom Bottom position, relative to parent 6481 */ 6482 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 6483 } 6484 6485 /** 6486 * Assign a size and position to this view. 6487 * 6488 * This is called from layout. 6489 * 6490 * @param left Left position, relative to parent 6491 * @param top Top position, relative to parent 6492 * @param right Right position, relative to parent 6493 * @param bottom Bottom position, relative to parent 6494 * @return true if the new size and position are different than the 6495 * previous ones 6496 * {@hide} 6497 */ 6498 protected boolean setFrame(int left, int top, int right, int bottom) { 6499 boolean changed = false; 6500 6501 if (DBG) { 6502 System.out.println(this + " View.setFrame(" + left + "," + top + "," 6503 + right + "," + bottom + ")"); 6504 } 6505 6506 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 6507 changed = true; 6508 6509 // Remember our drawn bit 6510 int drawn = mPrivateFlags & DRAWN; 6511 6512 // Invalidate our old position 6513 invalidate(); 6514 6515 6516 int oldWidth = mRight - mLeft; 6517 int oldHeight = mBottom - mTop; 6518 6519 mLeft = left; 6520 mTop = top; 6521 mRight = right; 6522 mBottom = bottom; 6523 6524 mPrivateFlags |= HAS_BOUNDS; 6525 6526 int newWidth = right - left; 6527 int newHeight = bottom - top; 6528 6529 if (newWidth != oldWidth || newHeight != oldHeight) { 6530 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 6531 } 6532 6533 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 6534 // If we are visible, force the DRAWN bit to on so that 6535 // this invalidate will go through (at least to our parent). 6536 // This is because someone may have invalidated this view 6537 // before this call to setFrame came in, therby clearing 6538 // the DRAWN bit. 6539 mPrivateFlags |= DRAWN; 6540 invalidate(); 6541 } 6542 6543 // Reset drawn bit to original value (invalidate turns it off) 6544 mPrivateFlags |= drawn; 6545 6546 mBackgroundSizeChanged = true; 6547 } 6548 return changed; 6549 } 6550 6551 /** 6552 * Finalize inflating a view from XML. This is called as the last phase 6553 * of inflation, after all child views have been added. 6554 * 6555 * <p>Even if the subclass overrides onFinishInflate, they should always be 6556 * sure to call the super method, so that we get called. 6557 */ 6558 protected void onFinishInflate() { 6559 } 6560 6561 /** 6562 * Returns the resources associated with this view. 6563 * 6564 * @return Resources object. 6565 */ 6566 public Resources getResources() { 6567 return mResources; 6568 } 6569 6570 /** 6571 * Invalidates the specified Drawable. 6572 * 6573 * @param drawable the drawable to invalidate 6574 */ 6575 public void invalidateDrawable(Drawable drawable) { 6576 if (verifyDrawable(drawable)) { 6577 final Rect dirty = drawable.getBounds(); 6578 final int scrollX = mScrollX; 6579 final int scrollY = mScrollY; 6580 6581 invalidate(dirty.left + scrollX, dirty.top + scrollY, 6582 dirty.right + scrollX, dirty.bottom + scrollY); 6583 } 6584 } 6585 6586 /** 6587 * Schedules an action on a drawable to occur at a specified time. 6588 * 6589 * @param who the recipient of the action 6590 * @param what the action to run on the drawable 6591 * @param when the time at which the action must occur. Uses the 6592 * {@link SystemClock#uptimeMillis} timebase. 6593 */ 6594 public void scheduleDrawable(Drawable who, Runnable what, long when) { 6595 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 6596 mAttachInfo.mHandler.postAtTime(what, who, when); 6597 } 6598 } 6599 6600 /** 6601 * Cancels a scheduled action on a drawable. 6602 * 6603 * @param who the recipient of the action 6604 * @param what the action to cancel 6605 */ 6606 public void unscheduleDrawable(Drawable who, Runnable what) { 6607 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 6608 mAttachInfo.mHandler.removeCallbacks(what, who); 6609 } 6610 } 6611 6612 /** 6613 * Unschedule any events associated with the given Drawable. This can be 6614 * used when selecting a new Drawable into a view, so that the previous 6615 * one is completely unscheduled. 6616 * 6617 * @param who The Drawable to unschedule. 6618 * 6619 * @see #drawableStateChanged 6620 */ 6621 public void unscheduleDrawable(Drawable who) { 6622 if (mAttachInfo != null) { 6623 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 6624 } 6625 } 6626 6627 /** 6628 * If your view subclass is displaying its own Drawable objects, it should 6629 * override this function and return true for any Drawable it is 6630 * displaying. This allows animations for those drawables to be 6631 * scheduled. 6632 * 6633 * <p>Be sure to call through to the super class when overriding this 6634 * function. 6635 * 6636 * @param who The Drawable to verify. Return true if it is one you are 6637 * displaying, else return the result of calling through to the 6638 * super class. 6639 * 6640 * @return boolean If true than the Drawable is being displayed in the 6641 * view; else false and it is not allowed to animate. 6642 * 6643 * @see #unscheduleDrawable 6644 * @see #drawableStateChanged 6645 */ 6646 protected boolean verifyDrawable(Drawable who) { 6647 return who == mBGDrawable; 6648 } 6649 6650 /** 6651 * This function is called whenever the state of the view changes in such 6652 * a way that it impacts the state of drawables being shown. 6653 * 6654 * <p>Be sure to call through to the superclass when overriding this 6655 * function. 6656 * 6657 * @see Drawable#setState 6658 */ 6659 protected void drawableStateChanged() { 6660 Drawable d = mBGDrawable; 6661 if (d != null && d.isStateful()) { 6662 d.setState(getDrawableState()); 6663 } 6664 } 6665 6666 /** 6667 * Call this to force a view to update its drawable state. This will cause 6668 * drawableStateChanged to be called on this view. Views that are interested 6669 * in the new state should call getDrawableState. 6670 * 6671 * @see #drawableStateChanged 6672 * @see #getDrawableState 6673 */ 6674 public void refreshDrawableState() { 6675 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 6676 drawableStateChanged(); 6677 6678 ViewParent parent = mParent; 6679 if (parent != null) { 6680 parent.childDrawableStateChanged(this); 6681 } 6682 } 6683 6684 /** 6685 * Return an array of resource IDs of the drawable states representing the 6686 * current state of the view. 6687 * 6688 * @return The current drawable state 6689 * 6690 * @see Drawable#setState 6691 * @see #drawableStateChanged 6692 * @see #onCreateDrawableState 6693 */ 6694 public final int[] getDrawableState() { 6695 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 6696 return mDrawableState; 6697 } else { 6698 mDrawableState = onCreateDrawableState(0); 6699 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 6700 return mDrawableState; 6701 } 6702 } 6703 6704 /** 6705 * Generate the new {@link android.graphics.drawable.Drawable} state for 6706 * this view. This is called by the view 6707 * system when the cached Drawable state is determined to be invalid. To 6708 * retrieve the current state, you should use {@link #getDrawableState}. 6709 * 6710 * @param extraSpace if non-zero, this is the number of extra entries you 6711 * would like in the returned array in which you can place your own 6712 * states. 6713 * 6714 * @return Returns an array holding the current {@link Drawable} state of 6715 * the view. 6716 * 6717 * @see #mergeDrawableStates 6718 */ 6719 protected int[] onCreateDrawableState(int extraSpace) { 6720 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 6721 mParent instanceof View) { 6722 return ((View) mParent).onCreateDrawableState(extraSpace); 6723 } 6724 6725 int[] drawableState; 6726 6727 int privateFlags = mPrivateFlags; 6728 6729 int viewStateIndex = (((privateFlags & PRESSED) != 0) ? 1 : 0); 6730 6731 viewStateIndex = (viewStateIndex << 1) 6732 + (((mViewFlags & ENABLED_MASK) == ENABLED) ? 1 : 0); 6733 6734 viewStateIndex = (viewStateIndex << 1) + (isFocused() ? 1 : 0); 6735 6736 viewStateIndex = (viewStateIndex << 1) 6737 + (((privateFlags & SELECTED) != 0) ? 1 : 0); 6738 6739 final boolean hasWindowFocus = hasWindowFocus(); 6740 viewStateIndex = (viewStateIndex << 1) + (hasWindowFocus ? 1 : 0); 6741 6742 drawableState = VIEW_STATE_SETS[viewStateIndex]; 6743 6744 //noinspection ConstantIfStatement 6745 if (false) { 6746 Log.i("View", "drawableStateIndex=" + viewStateIndex); 6747 Log.i("View", toString() 6748 + " pressed=" + ((privateFlags & PRESSED) != 0) 6749 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 6750 + " fo=" + hasFocus() 6751 + " sl=" + ((privateFlags & SELECTED) != 0) 6752 + " wf=" + hasWindowFocus 6753 + ": " + Arrays.toString(drawableState)); 6754 } 6755 6756 if (extraSpace == 0) { 6757 return drawableState; 6758 } 6759 6760 final int[] fullState; 6761 if (drawableState != null) { 6762 fullState = new int[drawableState.length + extraSpace]; 6763 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 6764 } else { 6765 fullState = new int[extraSpace]; 6766 } 6767 6768 return fullState; 6769 } 6770 6771 /** 6772 * Merge your own state values in <var>additionalState</var> into the base 6773 * state values <var>baseState</var> that were returned by 6774 * {@link #onCreateDrawableState}. 6775 * 6776 * @param baseState The base state values returned by 6777 * {@link #onCreateDrawableState}, which will be modified to also hold your 6778 * own additional state values. 6779 * 6780 * @param additionalState The additional state values you would like 6781 * added to <var>baseState</var>; this array is not modified. 6782 * 6783 * @return As a convenience, the <var>baseState</var> array you originally 6784 * passed into the function is returned. 6785 * 6786 * @see #onCreateDrawableState 6787 */ 6788 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 6789 final int N = baseState.length; 6790 int i = N - 1; 6791 while (i >= 0 && baseState[i] == 0) { 6792 i--; 6793 } 6794 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 6795 return baseState; 6796 } 6797 6798 /** 6799 * Sets the background color for this view. 6800 * @param color the color of the background 6801 */ 6802 public void setBackgroundColor(int color) { 6803 setBackgroundDrawable(new ColorDrawable(color)); 6804 } 6805 6806 /** 6807 * Set the background to a given resource. The resource should refer to 6808 * a Drawable object. 6809 * @param resid The identifier of the resource. 6810 * @attr ref android.R.styleable#View_background 6811 */ 6812 public void setBackgroundResource(int resid) { 6813 if (resid != 0 && resid == mBackgroundResource) { 6814 return; 6815 } 6816 6817 Drawable d= null; 6818 if (resid != 0) { 6819 d = mResources.getDrawable(resid); 6820 } 6821 setBackgroundDrawable(d); 6822 6823 mBackgroundResource = resid; 6824 } 6825 6826 /** 6827 * Set the background to a given Drawable, or remove the background. If the 6828 * background has padding, this View's padding is set to the background's 6829 * padding. However, when a background is removed, this View's padding isn't 6830 * touched. If setting the padding is desired, please use 6831 * {@link #setPadding(int, int, int, int)}. 6832 * 6833 * @param d The Drawable to use as the background, or null to remove the 6834 * background 6835 */ 6836 public void setBackgroundDrawable(Drawable d) { 6837 boolean requestLayout = false; 6838 6839 mBackgroundResource = 0; 6840 6841 /* 6842 * Regardless of whether we're setting a new background or not, we want 6843 * to clear the previous drawable. 6844 */ 6845 if (mBGDrawable != null) { 6846 mBGDrawable.setCallback(null); 6847 unscheduleDrawable(mBGDrawable); 6848 } 6849 6850 if (d != null) { 6851 Rect padding = sThreadLocal.get(); 6852 if (padding == null) { 6853 padding = new Rect(); 6854 sThreadLocal.set(padding); 6855 } 6856 if (d.getPadding(padding)) { 6857 setPadding(padding.left, padding.top, padding.right, padding.bottom); 6858 } 6859 6860 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 6861 // if it has a different minimum size, we should layout again 6862 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 6863 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 6864 requestLayout = true; 6865 } 6866 6867 d.setCallback(this); 6868 if (d.isStateful()) { 6869 d.setState(getDrawableState()); 6870 } 6871 d.setVisible(getVisibility() == VISIBLE, false); 6872 mBGDrawable = d; 6873 6874 if ((mPrivateFlags & SKIP_DRAW) != 0) { 6875 mPrivateFlags &= ~SKIP_DRAW; 6876 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 6877 requestLayout = true; 6878 } 6879 } else { 6880 /* Remove the background */ 6881 mBGDrawable = null; 6882 6883 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 6884 /* 6885 * This view ONLY drew the background before and we're removing 6886 * the background, so now it won't draw anything 6887 * (hence we SKIP_DRAW) 6888 */ 6889 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 6890 mPrivateFlags |= SKIP_DRAW; 6891 } 6892 6893 /* 6894 * When the background is set, we try to apply its padding to this 6895 * View. When the background is removed, we don't touch this View's 6896 * padding. This is noted in the Javadocs. Hence, we don't need to 6897 * requestLayout(), the invalidate() below is sufficient. 6898 */ 6899 6900 // The old background's minimum size could have affected this 6901 // View's layout, so let's requestLayout 6902 requestLayout = true; 6903 } 6904 6905 computeOpaqueFlags(); 6906 6907 if (requestLayout) { 6908 requestLayout(); 6909 } 6910 6911 mBackgroundSizeChanged = true; 6912 invalidate(); 6913 } 6914 6915 /** 6916 * Gets the background drawable 6917 * @return The drawable used as the background for this view, if any. 6918 */ 6919 public Drawable getBackground() { 6920 return mBGDrawable; 6921 } 6922 6923 /** 6924 * Sets the padding. The view may add on the space required to display 6925 * the scrollbars, depending on the style and visibility of the scrollbars. 6926 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 6927 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 6928 * from the values set in this call. 6929 * 6930 * @attr ref android.R.styleable#View_padding 6931 * @attr ref android.R.styleable#View_paddingBottom 6932 * @attr ref android.R.styleable#View_paddingLeft 6933 * @attr ref android.R.styleable#View_paddingRight 6934 * @attr ref android.R.styleable#View_paddingTop 6935 * @param left the left padding in pixels 6936 * @param top the top padding in pixels 6937 * @param right the right padding in pixels 6938 * @param bottom the bottom padding in pixels 6939 */ 6940 public void setPadding(int left, int top, int right, int bottom) { 6941 boolean changed = false; 6942 6943 mUserPaddingRight = right; 6944 mUserPaddingBottom = bottom; 6945 6946 final int viewFlags = mViewFlags; 6947 6948 // Common case is there are no scroll bars. 6949 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 6950 // TODO: Deal with RTL languages to adjust left padding instead of right. 6951 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 6952 right += (viewFlags & SCROLLBARS_INSET_MASK) == 0 6953 ? 0 : getVerticalScrollbarWidth(); 6954 } 6955 if ((viewFlags & SCROLLBARS_HORIZONTAL) == 0) { 6956 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 6957 ? 0 : getHorizontalScrollbarHeight(); 6958 } 6959 } 6960 6961 if (mPaddingLeft != left) { 6962 changed = true; 6963 mPaddingLeft = left; 6964 } 6965 if (mPaddingTop != top) { 6966 changed = true; 6967 mPaddingTop = top; 6968 } 6969 if (mPaddingRight != right) { 6970 changed = true; 6971 mPaddingRight = right; 6972 } 6973 if (mPaddingBottom != bottom) { 6974 changed = true; 6975 mPaddingBottom = bottom; 6976 } 6977 6978 if (changed) { 6979 requestLayout(); 6980 } 6981 } 6982 6983 /** 6984 * Returns the top padding of this view. 6985 * 6986 * @return the top padding in pixels 6987 */ 6988 public int getPaddingTop() { 6989 return mPaddingTop; 6990 } 6991 6992 /** 6993 * Returns the bottom padding of this view. If there are inset and enabled 6994 * scrollbars, this value may include the space required to display the 6995 * scrollbars as well. 6996 * 6997 * @return the bottom padding in pixels 6998 */ 6999 public int getPaddingBottom() { 7000 return mPaddingBottom; 7001 } 7002 7003 /** 7004 * Returns the left padding of this view. If there are inset and enabled 7005 * scrollbars, this value may include the space required to display the 7006 * scrollbars as well. 7007 * 7008 * @return the left padding in pixels 7009 */ 7010 public int getPaddingLeft() { 7011 return mPaddingLeft; 7012 } 7013 7014 /** 7015 * Returns the right padding of this view. If there are inset and enabled 7016 * scrollbars, this value may include the space required to display the 7017 * scrollbars as well. 7018 * 7019 * @return the right padding in pixels 7020 */ 7021 public int getPaddingRight() { 7022 return mPaddingRight; 7023 } 7024 7025 /** 7026 * Changes the selection state of this view. A view can be selected or not. 7027 * Note that selection is not the same as focus. Views are typically 7028 * selected in the context of an AdapterView like ListView or GridView; 7029 * the selected view is the view that is highlighted. 7030 * 7031 * @param selected true if the view must be selected, false otherwise 7032 */ 7033 public void setSelected(boolean selected) { 7034 if (((mPrivateFlags & SELECTED) != 0) != selected) { 7035 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 7036 if (!selected) resetPressedState(); 7037 invalidate(); 7038 refreshDrawableState(); 7039 dispatchSetSelected(selected); 7040 } 7041 } 7042 7043 /** 7044 * Dispatch setSelected to all of this View's children. 7045 * 7046 * @see #setSelected(boolean) 7047 * 7048 * @param selected The new selected state 7049 */ 7050 protected void dispatchSetSelected(boolean selected) { 7051 } 7052 7053 /** 7054 * Indicates the selection state of this view. 7055 * 7056 * @return true if the view is selected, false otherwise 7057 */ 7058 @ViewDebug.ExportedProperty 7059 public boolean isSelected() { 7060 return (mPrivateFlags & SELECTED) != 0; 7061 } 7062 7063 /** 7064 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 7065 * observer can be used to get notifications when global events, like 7066 * layout, happen. 7067 * 7068 * The returned ViewTreeObserver observer is not guaranteed to remain 7069 * valid for the lifetime of this View. If the caller of this method keeps 7070 * a long-lived reference to ViewTreeObserver, it should always check for 7071 * the return value of {@link ViewTreeObserver#isAlive()}. 7072 * 7073 * @return The ViewTreeObserver for this view's hierarchy. 7074 */ 7075 public ViewTreeObserver getViewTreeObserver() { 7076 if (mAttachInfo != null) { 7077 return mAttachInfo.mTreeObserver; 7078 } 7079 if (mFloatingTreeObserver == null) { 7080 mFloatingTreeObserver = new ViewTreeObserver(); 7081 } 7082 return mFloatingTreeObserver; 7083 } 7084 7085 /** 7086 * <p>Finds the topmost view in the current view hierarchy.</p> 7087 * 7088 * @return the topmost view containing this view 7089 */ 7090 public View getRootView() { 7091 if (mAttachInfo != null) { 7092 final View v = mAttachInfo.mRootView; 7093 if (v != null) { 7094 return v; 7095 } 7096 } 7097 7098 View parent = this; 7099 7100 while (parent.mParent != null && parent.mParent instanceof View) { 7101 parent = (View) parent.mParent; 7102 } 7103 7104 return parent; 7105 } 7106 7107 /** 7108 * <p>Computes the coordinates of this view on the screen. The argument 7109 * must be an array of two integers. After the method returns, the array 7110 * contains the x and y location in that order.</p> 7111 * 7112 * @param location an array of two integers in which to hold the coordinates 7113 */ 7114 public void getLocationOnScreen(int[] location) { 7115 getLocationInWindow(location); 7116 7117 final AttachInfo info = mAttachInfo; 7118 location[0] += info.mWindowLeft; 7119 location[1] += info.mWindowTop; 7120 } 7121 7122 /** 7123 * <p>Computes the coordinates of this view in its window. The argument 7124 * must be an array of two integers. After the method returns, the array 7125 * contains the x and y location in that order.</p> 7126 * 7127 * @param location an array of two integers in which to hold the coordinates 7128 */ 7129 public void getLocationInWindow(int[] location) { 7130 if (location == null || location.length < 2) { 7131 throw new IllegalArgumentException("location must be an array of " 7132 + "two integers"); 7133 } 7134 7135 location[0] = mLeft; 7136 location[1] = mTop; 7137 7138 ViewParent viewParent = mParent; 7139 while (viewParent instanceof View) { 7140 final View view = (View)viewParent; 7141 location[0] += view.mLeft - view.mScrollX; 7142 location[1] += view.mTop - view.mScrollY; 7143 viewParent = view.mParent; 7144 } 7145 7146 if (viewParent instanceof ViewRoot) { 7147 // *cough* 7148 final ViewRoot vr = (ViewRoot)viewParent; 7149 location[1] -= vr.mCurScrollY; 7150 } 7151 } 7152 7153 /** 7154 * {@hide} 7155 * @param id the id of the view to be found 7156 * @return the view of the specified id, null if cannot be found 7157 */ 7158 protected View findViewTraversal(int id) { 7159 if (id == mID) { 7160 return this; 7161 } 7162 return null; 7163 } 7164 7165 /** 7166 * {@hide} 7167 * @param tag the tag of the view to be found 7168 * @return the view of specified tag, null if cannot be found 7169 */ 7170 protected View findViewWithTagTraversal(Object tag) { 7171 if (tag != null && tag.equals(mTag)) { 7172 return this; 7173 } 7174 return null; 7175 } 7176 7177 /** 7178 * Look for a child view with the given id. If this view has the given 7179 * id, return this view. 7180 * 7181 * @param id The id to search for. 7182 * @return The view that has the given id in the hierarchy or null 7183 */ 7184 public final View findViewById(int id) { 7185 if (id < 0) { 7186 return null; 7187 } 7188 return findViewTraversal(id); 7189 } 7190 7191 /** 7192 * Look for a child view with the given tag. If this view has the given 7193 * tag, return this view. 7194 * 7195 * @param tag The tag to search for, using "tag.equals(getTag())". 7196 * @return The View that has the given tag in the hierarchy or null 7197 */ 7198 public final View findViewWithTag(Object tag) { 7199 if (tag == null) { 7200 return null; 7201 } 7202 return findViewWithTagTraversal(tag); 7203 } 7204 7205 /** 7206 * Sets the identifier for this view. The identifier does not have to be 7207 * unique in this view's hierarchy. The identifier should be a positive 7208 * number. 7209 * 7210 * @see #NO_ID 7211 * @see #getId 7212 * @see #findViewById 7213 * 7214 * @param id a number used to identify the view 7215 * 7216 * @attr ref android.R.styleable#View_id 7217 */ 7218 public void setId(int id) { 7219 mID = id; 7220 } 7221 7222 /** 7223 * {@hide} 7224 * 7225 * @param isRoot true if the view belongs to the root namespace, false 7226 * otherwise 7227 */ 7228 public void setIsRootNamespace(boolean isRoot) { 7229 if (isRoot) { 7230 mPrivateFlags |= IS_ROOT_NAMESPACE; 7231 } else { 7232 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 7233 } 7234 } 7235 7236 /** 7237 * {@hide} 7238 * 7239 * @return true if the view belongs to the root namespace, false otherwise 7240 */ 7241 public boolean isRootNamespace() { 7242 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 7243 } 7244 7245 /** 7246 * Returns this view's identifier. 7247 * 7248 * @return a positive integer used to identify the view or {@link #NO_ID} 7249 * if the view has no ID 7250 * 7251 * @see #setId 7252 * @see #findViewById 7253 * @attr ref android.R.styleable#View_id 7254 */ 7255 @ViewDebug.CapturedViewProperty 7256 public int getId() { 7257 return mID; 7258 } 7259 7260 /** 7261 * Returns this view's tag. 7262 * 7263 * @return the Object stored in this view as a tag 7264 * 7265 * @see #setTag(Object) 7266 * @see #getTag(int) 7267 */ 7268 @ViewDebug.ExportedProperty 7269 public Object getTag() { 7270 return mTag; 7271 } 7272 7273 /** 7274 * Sets the tag associated with this view. A tag can be used to mark 7275 * a view in its hierarchy and does not have to be unique within the 7276 * hierarchy. Tags can also be used to store data within a view without 7277 * resorting to another data structure. 7278 * 7279 * @param tag an Object to tag the view with 7280 * 7281 * @see #getTag() 7282 * @see #setTag(int, Object) 7283 */ 7284 public void setTag(final Object tag) { 7285 mTag = tag; 7286 } 7287 7288 /** 7289 * Returns the tag associated with this view and the specified key. 7290 * 7291 * @param key The key identifying the tag 7292 * 7293 * @return the Object stored in this view as a tag 7294 * 7295 * @see #setTag(int, Object) 7296 * @see #getTag() 7297 */ 7298 public Object getTag(int key) { 7299 SparseArray<Object> tags = null; 7300 synchronized (sTagsLock) { 7301 if (sTags != null) { 7302 tags = sTags.get(this); 7303 } 7304 } 7305 7306 if (tags != null) return tags.get(key); 7307 return null; 7308 } 7309 7310 /** 7311 * Sets a tag associated with this view and a key. A tag can be used 7312 * to mark a view in its hierarchy and does not have to be unique within 7313 * the hierarchy. Tags can also be used to store data within a view 7314 * without resorting to another data structure. 7315 * 7316 * The specified key should be an id declared in the resources of the 7317 * application to ensure it is unique. Keys identified as belonging to 7318 * the Android framework or not associated with any package will cause 7319 * an {@link IllegalArgumentException} to be thrown. 7320 * 7321 * @param key The key identifying the tag 7322 * @param tag An Object to tag the view with 7323 * 7324 * @throws IllegalArgumentException If they specified key is not valid 7325 * 7326 * @see #setTag(Object) 7327 * @see #getTag(int) 7328 */ 7329 public void setTag(int key, final Object tag) { 7330 // If the package id is 0x00 or 0x01, it's either an undefined package 7331 // or a framework id 7332 if ((key >>> 24) < 2) { 7333 throw new IllegalArgumentException("The key must be an application-specific " 7334 + "resource id."); 7335 } 7336 7337 setTagInternal(this, key, tag); 7338 } 7339 7340 /** 7341 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 7342 * framework id. 7343 * 7344 * @hide 7345 */ 7346 public void setTagInternal(int key, Object tag) { 7347 if ((key >>> 24) != 0x1) { 7348 throw new IllegalArgumentException("The key must be a framework-specific " 7349 + "resource id."); 7350 } 7351 7352 setTagInternal(this, key, tag); 7353 } 7354 7355 private static void setTagInternal(View view, int key, Object tag) { 7356 SparseArray<Object> tags = null; 7357 synchronized (sTagsLock) { 7358 if (sTags == null) { 7359 sTags = new WeakHashMap<View, SparseArray<Object>>(); 7360 } else { 7361 tags = sTags.get(view); 7362 } 7363 } 7364 7365 if (tags == null) { 7366 tags = new SparseArray<Object>(2); 7367 synchronized (sTagsLock) { 7368 sTags.put(view, tags); 7369 } 7370 } 7371 7372 tags.put(key, tag); 7373 } 7374 7375 /** 7376 * @param consistency The type of consistency. See ViewDebug for more information. 7377 * 7378 * @hide 7379 */ 7380 protected boolean dispatchConsistencyCheck(int consistency) { 7381 return onConsistencyCheck(consistency); 7382 } 7383 7384 /** 7385 * Method that subclasses should implement to check their consistency. The type of 7386 * consistency check is indicated by the bit field passed as a parameter. 7387 * 7388 * @param consistency The type of consistency. See ViewDebug for more information. 7389 * 7390 * @throws IllegalStateException if the view is in an inconsistent state. 7391 * 7392 * @hide 7393 */ 7394 protected boolean onConsistencyCheck(int consistency) { 7395 boolean result = true; 7396 7397 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 7398 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 7399 7400 if (checkLayout) { 7401 if (getParent() == null) { 7402 result = false; 7403 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 7404 "View " + this + " does not have a parent."); 7405 } 7406 7407 if (mAttachInfo == null) { 7408 result = false; 7409 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 7410 "View " + this + " is not attached to a window."); 7411 } 7412 } 7413 7414 if (checkDrawing) { 7415 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 7416 // from their draw() method 7417 7418 if ((mPrivateFlags & DRAWN) != DRAWN && 7419 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 7420 result = false; 7421 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 7422 "View " + this + " was invalidated but its drawing cache is valid."); 7423 } 7424 } 7425 7426 return result; 7427 } 7428 7429 /** 7430 * Prints information about this view in the log output, with the tag 7431 * {@link #VIEW_LOG_TAG}. 7432 * 7433 * @hide 7434 */ 7435 public void debug() { 7436 debug(0); 7437 } 7438 7439 /** 7440 * Prints information about this view in the log output, with the tag 7441 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 7442 * indentation defined by the <code>depth</code>. 7443 * 7444 * @param depth the indentation level 7445 * 7446 * @hide 7447 */ 7448 protected void debug(int depth) { 7449 String output = debugIndent(depth - 1); 7450 7451 output += "+ " + this; 7452 int id = getId(); 7453 if (id != -1) { 7454 output += " (id=" + id + ")"; 7455 } 7456 Object tag = getTag(); 7457 if (tag != null) { 7458 output += " (tag=" + tag + ")"; 7459 } 7460 Log.d(VIEW_LOG_TAG, output); 7461 7462 if ((mPrivateFlags & FOCUSED) != 0) { 7463 output = debugIndent(depth) + " FOCUSED"; 7464 Log.d(VIEW_LOG_TAG, output); 7465 } 7466 7467 output = debugIndent(depth); 7468 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 7469 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 7470 + "} "; 7471 Log.d(VIEW_LOG_TAG, output); 7472 7473 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 7474 || mPaddingBottom != 0) { 7475 output = debugIndent(depth); 7476 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 7477 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 7478 Log.d(VIEW_LOG_TAG, output); 7479 } 7480 7481 output = debugIndent(depth); 7482 output += "mMeasureWidth=" + mMeasuredWidth + 7483 " mMeasureHeight=" + mMeasuredHeight; 7484 Log.d(VIEW_LOG_TAG, output); 7485 7486 output = debugIndent(depth); 7487 if (mLayoutParams == null) { 7488 output += "BAD! no layout params"; 7489 } else { 7490 output = mLayoutParams.debug(output); 7491 } 7492 Log.d(VIEW_LOG_TAG, output); 7493 7494 output = debugIndent(depth); 7495 output += "flags={"; 7496 output += View.printFlags(mViewFlags); 7497 output += "}"; 7498 Log.d(VIEW_LOG_TAG, output); 7499 7500 output = debugIndent(depth); 7501 output += "privateFlags={"; 7502 output += View.printPrivateFlags(mPrivateFlags); 7503 output += "}"; 7504 Log.d(VIEW_LOG_TAG, output); 7505 } 7506 7507 /** 7508 * Creates an string of whitespaces used for indentation. 7509 * 7510 * @param depth the indentation level 7511 * @return a String containing (depth * 2 + 3) * 2 white spaces 7512 * 7513 * @hide 7514 */ 7515 protected static String debugIndent(int depth) { 7516 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 7517 for (int i = 0; i < (depth * 2) + 3; i++) { 7518 spaces.append(' ').append(' '); 7519 } 7520 return spaces.toString(); 7521 } 7522 7523 /** 7524 * <p>Return the offset of the widget's text baseline from the widget's top 7525 * boundary. If this widget does not support baseline alignment, this 7526 * method returns -1. </p> 7527 * 7528 * @return the offset of the baseline within the widget's bounds or -1 7529 * if baseline alignment is not supported 7530 */ 7531 @ViewDebug.ExportedProperty 7532 public int getBaseline() { 7533 return -1; 7534 } 7535 7536 /** 7537 * Call this when something has changed which has invalidated the 7538 * layout of this view. This will schedule a layout pass of the view 7539 * tree. 7540 */ 7541 public void requestLayout() { 7542 if (ViewDebug.TRACE_HIERARCHY) { 7543 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 7544 } 7545 7546 mPrivateFlags |= FORCE_LAYOUT; 7547 7548 if (mParent != null && !mParent.isLayoutRequested()) { 7549 mParent.requestLayout(); 7550 } 7551 } 7552 7553 /** 7554 * Forces this view to be laid out during the next layout pass. 7555 * This method does not call requestLayout() or forceLayout() 7556 * on the parent. 7557 */ 7558 public void forceLayout() { 7559 mPrivateFlags |= FORCE_LAYOUT; 7560 } 7561 7562 /** 7563 * <p> 7564 * This is called to find out how big a view should be. The parent 7565 * supplies constraint information in the width and height parameters. 7566 * </p> 7567 * 7568 * <p> 7569 * The actual mesurement work of a view is performed in 7570 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 7571 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 7572 * </p> 7573 * 7574 * 7575 * @param widthMeasureSpec Horizontal space requirements as imposed by the 7576 * parent 7577 * @param heightMeasureSpec Vertical space requirements as imposed by the 7578 * parent 7579 * 7580 * @see #onMeasure(int, int) 7581 */ 7582 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 7583 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 7584 widthMeasureSpec != mOldWidthMeasureSpec || 7585 heightMeasureSpec != mOldHeightMeasureSpec) { 7586 7587 // first clears the measured dimension flag 7588 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 7589 7590 if (ViewDebug.TRACE_HIERARCHY) { 7591 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 7592 } 7593 7594 // measure ourselves, this should set the measured dimension flag back 7595 onMeasure(widthMeasureSpec, heightMeasureSpec); 7596 7597 // flag not set, setMeasuredDimension() was not invoked, we raise 7598 // an exception to warn the developer 7599 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 7600 throw new IllegalStateException("onMeasure() did not set the" 7601 + " measured dimension by calling" 7602 + " setMeasuredDimension()"); 7603 } 7604 7605 mPrivateFlags |= LAYOUT_REQUIRED; 7606 } 7607 7608 mOldWidthMeasureSpec = widthMeasureSpec; 7609 mOldHeightMeasureSpec = heightMeasureSpec; 7610 } 7611 7612 /** 7613 * <p> 7614 * Measure the view and its content to determine the measured width and the 7615 * measured height. This method is invoked by {@link #measure(int, int)} and 7616 * should be overriden by subclasses to provide accurate and efficient 7617 * measurement of their contents. 7618 * </p> 7619 * 7620 * <p> 7621 * <strong>CONTRACT:</strong> When overriding this method, you 7622 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 7623 * measured width and height of this view. Failure to do so will trigger an 7624 * <code>IllegalStateException</code>, thrown by 7625 * {@link #measure(int, int)}. Calling the superclass' 7626 * {@link #onMeasure(int, int)} is a valid use. 7627 * </p> 7628 * 7629 * <p> 7630 * The base class implementation of measure defaults to the background size, 7631 * unless a larger size is allowed by the MeasureSpec. Subclasses should 7632 * override {@link #onMeasure(int, int)} to provide better measurements of 7633 * their content. 7634 * </p> 7635 * 7636 * <p> 7637 * If this method is overridden, it is the subclass's responsibility to make 7638 * sure the measured height and width are at least the view's minimum height 7639 * and width ({@link #getSuggestedMinimumHeight()} and 7640 * {@link #getSuggestedMinimumWidth()}). 7641 * </p> 7642 * 7643 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 7644 * The requirements are encoded with 7645 * {@link android.view.View.MeasureSpec}. 7646 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 7647 * The requirements are encoded with 7648 * {@link android.view.View.MeasureSpec}. 7649 * 7650 * @see #getMeasuredWidth() 7651 * @see #getMeasuredHeight() 7652 * @see #setMeasuredDimension(int, int) 7653 * @see #getSuggestedMinimumHeight() 7654 * @see #getSuggestedMinimumWidth() 7655 * @see android.view.View.MeasureSpec#getMode(int) 7656 * @see android.view.View.MeasureSpec#getSize(int) 7657 */ 7658 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 7659 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 7660 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 7661 } 7662 7663 /** 7664 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 7665 * measured width and measured height. Failing to do so will trigger an 7666 * exception at measurement time.</p> 7667 * 7668 * @param measuredWidth the measured width of this view 7669 * @param measuredHeight the measured height of this view 7670 */ 7671 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 7672 mMeasuredWidth = measuredWidth; 7673 mMeasuredHeight = measuredHeight; 7674 7675 mPrivateFlags |= MEASURED_DIMENSION_SET; 7676 } 7677 7678 /** 7679 * Utility to reconcile a desired size with constraints imposed by a MeasureSpec. 7680 * Will take the desired size, unless a different size is imposed by the constraints. 7681 * 7682 * @param size How big the view wants to be 7683 * @param measureSpec Constraints imposed by the parent 7684 * @return The size this view should be. 7685 */ 7686 public static int resolveSize(int size, int measureSpec) { 7687 int result = size; 7688 int specMode = MeasureSpec.getMode(measureSpec); 7689 int specSize = MeasureSpec.getSize(measureSpec); 7690 switch (specMode) { 7691 case MeasureSpec.UNSPECIFIED: 7692 result = size; 7693 break; 7694 case MeasureSpec.AT_MOST: 7695 result = Math.min(size, specSize); 7696 break; 7697 case MeasureSpec.EXACTLY: 7698 result = specSize; 7699 break; 7700 } 7701 return result; 7702 } 7703 7704 /** 7705 * Utility to return a default size. Uses the supplied size if the 7706 * MeasureSpec imposed no contraints. Will get larger if allowed 7707 * by the MeasureSpec. 7708 * 7709 * @param size Default size for this view 7710 * @param measureSpec Constraints imposed by the parent 7711 * @return The size this view should be. 7712 */ 7713 public static int getDefaultSize(int size, int measureSpec) { 7714 int result = size; 7715 int specMode = MeasureSpec.getMode(measureSpec); 7716 int specSize = MeasureSpec.getSize(measureSpec); 7717 7718 switch (specMode) { 7719 case MeasureSpec.UNSPECIFIED: 7720 result = size; 7721 break; 7722 case MeasureSpec.AT_MOST: 7723 case MeasureSpec.EXACTLY: 7724 result = specSize; 7725 break; 7726 } 7727 return result; 7728 } 7729 7730 /** 7731 * Returns the suggested minimum height that the view should use. This 7732 * returns the maximum of the view's minimum height 7733 * and the background's minimum height 7734 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 7735 * <p> 7736 * When being used in {@link #onMeasure(int, int)}, the caller should still 7737 * ensure the returned height is within the requirements of the parent. 7738 * 7739 * @return The suggested minimum height of the view. 7740 */ 7741 protected int getSuggestedMinimumHeight() { 7742 int suggestedMinHeight = mMinHeight; 7743 7744 if (mBGDrawable != null) { 7745 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 7746 if (suggestedMinHeight < bgMinHeight) { 7747 suggestedMinHeight = bgMinHeight; 7748 } 7749 } 7750 7751 return suggestedMinHeight; 7752 } 7753 7754 /** 7755 * Returns the suggested minimum width that the view should use. This 7756 * returns the maximum of the view's minimum width) 7757 * and the background's minimum width 7758 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 7759 * <p> 7760 * When being used in {@link #onMeasure(int, int)}, the caller should still 7761 * ensure the returned width is within the requirements of the parent. 7762 * 7763 * @return The suggested minimum width of the view. 7764 */ 7765 protected int getSuggestedMinimumWidth() { 7766 int suggestedMinWidth = mMinWidth; 7767 7768 if (mBGDrawable != null) { 7769 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 7770 if (suggestedMinWidth < bgMinWidth) { 7771 suggestedMinWidth = bgMinWidth; 7772 } 7773 } 7774 7775 return suggestedMinWidth; 7776 } 7777 7778 /** 7779 * Sets the minimum height of the view. It is not guaranteed the view will 7780 * be able to achieve this minimum height (for example, if its parent layout 7781 * constrains it with less available height). 7782 * 7783 * @param minHeight The minimum height the view will try to be. 7784 */ 7785 public void setMinimumHeight(int minHeight) { 7786 mMinHeight = minHeight; 7787 } 7788 7789 /** 7790 * Sets the minimum width of the view. It is not guaranteed the view will 7791 * be able to achieve this minimum width (for example, if its parent layout 7792 * constrains it with less available width). 7793 * 7794 * @param minWidth The minimum width the view will try to be. 7795 */ 7796 public void setMinimumWidth(int minWidth) { 7797 mMinWidth = minWidth; 7798 } 7799 7800 /** 7801 * Get the animation currently associated with this view. 7802 * 7803 * @return The animation that is currently playing or 7804 * scheduled to play for this view. 7805 */ 7806 public Animation getAnimation() { 7807 return mCurrentAnimation; 7808 } 7809 7810 /** 7811 * Start the specified animation now. 7812 * 7813 * @param animation the animation to start now 7814 */ 7815 public void startAnimation(Animation animation) { 7816 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 7817 setAnimation(animation); 7818 invalidate(); 7819 } 7820 7821 /** 7822 * Cancels any animations for this view. 7823 */ 7824 public void clearAnimation() { 7825 mCurrentAnimation = null; 7826 } 7827 7828 /** 7829 * Sets the next animation to play for this view. 7830 * If you want the animation to play immediately, use 7831 * startAnimation. This method provides allows fine-grained 7832 * control over the start time and invalidation, but you 7833 * must make sure that 1) the animation has a start time set, and 7834 * 2) the view will be invalidated when the animation is supposed to 7835 * start. 7836 * 7837 * @param animation The next animation, or null. 7838 */ 7839 public void setAnimation(Animation animation) { 7840 mCurrentAnimation = animation; 7841 if (animation != null) { 7842 animation.reset(); 7843 } 7844 } 7845 7846 /** 7847 * Invoked by a parent ViewGroup to notify the start of the animation 7848 * currently associated with this view. If you override this method, 7849 * always call super.onAnimationStart(); 7850 * 7851 * @see #setAnimation(android.view.animation.Animation) 7852 * @see #getAnimation() 7853 */ 7854 protected void onAnimationStart() { 7855 mPrivateFlags |= ANIMATION_STARTED; 7856 } 7857 7858 /** 7859 * Invoked by a parent ViewGroup to notify the end of the animation 7860 * currently associated with this view. If you override this method, 7861 * always call super.onAnimationEnd(); 7862 * 7863 * @see #setAnimation(android.view.animation.Animation) 7864 * @see #getAnimation() 7865 */ 7866 protected void onAnimationEnd() { 7867 mPrivateFlags &= ~ANIMATION_STARTED; 7868 } 7869 7870 /** 7871 * Invoked if there is a Transform that involves alpha. Subclass that can 7872 * draw themselves with the specified alpha should return true, and then 7873 * respect that alpha when their onDraw() is called. If this returns false 7874 * then the view may be redirected to draw into an offscreen buffer to 7875 * fulfill the request, which will look fine, but may be slower than if the 7876 * subclass handles it internally. The default implementation returns false. 7877 * 7878 * @param alpha The alpha (0..255) to apply to the view's drawing 7879 * @return true if the view can draw with the specified alpha. 7880 */ 7881 protected boolean onSetAlpha(int alpha) { 7882 return false; 7883 } 7884 7885 /** 7886 * This is used by the RootView to perform an optimization when 7887 * the view hierarchy contains one or several SurfaceView. 7888 * SurfaceView is always considered transparent, but its children are not, 7889 * therefore all View objects remove themselves from the global transparent 7890 * region (passed as a parameter to this function). 7891 * 7892 * @param region The transparent region for this ViewRoot (window). 7893 * 7894 * @return Returns true if the effective visibility of the view at this 7895 * point is opaque, regardless of the transparent region; returns false 7896 * if it is possible for underlying windows to be seen behind the view. 7897 * 7898 * {@hide} 7899 */ 7900 public boolean gatherTransparentRegion(Region region) { 7901 final AttachInfo attachInfo = mAttachInfo; 7902 if (region != null && attachInfo != null) { 7903 final int pflags = mPrivateFlags; 7904 if ((pflags & SKIP_DRAW) == 0) { 7905 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 7906 // remove it from the transparent region. 7907 final int[] location = attachInfo.mTransparentLocation; 7908 getLocationInWindow(location); 7909 region.op(location[0], location[1], location[0] + mRight - mLeft, 7910 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 7911 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 7912 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 7913 // exists, so we remove the background drawable's non-transparent 7914 // parts from this transparent region. 7915 applyDrawableToTransparentRegion(mBGDrawable, region); 7916 } 7917 } 7918 return true; 7919 } 7920 7921 /** 7922 * Play a sound effect for this view. 7923 * 7924 * <p>The framework will play sound effects for some built in actions, such as 7925 * clicking, but you may wish to play these effects in your widget, 7926 * for instance, for internal navigation. 7927 * 7928 * <p>The sound effect will only be played if sound effects are enabled by the user, and 7929 * {@link #isSoundEffectsEnabled()} is true. 7930 * 7931 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 7932 */ 7933 public void playSoundEffect(int soundConstant) { 7934 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 7935 return; 7936 } 7937 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 7938 } 7939 7940 /** 7941 * BZZZTT!!1! 7942 * 7943 * <p>Provide haptic feedback to the user for this view. 7944 * 7945 * <p>The framework will provide haptic feedback for some built in actions, 7946 * such as long presses, but you may wish to provide feedback for your 7947 * own widget. 7948 * 7949 * <p>The feedback will only be performed if 7950 * {@link #isHapticFeedbackEnabled()} is true. 7951 * 7952 * @param feedbackConstant One of the constants defined in 7953 * {@link HapticFeedbackConstants} 7954 */ 7955 public boolean performHapticFeedback(int feedbackConstant) { 7956 return performHapticFeedback(feedbackConstant, 0); 7957 } 7958 7959 /** 7960 * BZZZTT!!1! 7961 * 7962 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 7963 * 7964 * @param feedbackConstant One of the constants defined in 7965 * {@link HapticFeedbackConstants} 7966 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 7967 */ 7968 public boolean performHapticFeedback(int feedbackConstant, int flags) { 7969 if (mAttachInfo == null) { 7970 return false; 7971 } 7972 if ((flags&HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 7973 && !isHapticFeedbackEnabled()) { 7974 return false; 7975 } 7976 return mAttachInfo.mRootCallbacks.performHapticFeedback( 7977 feedbackConstant, 7978 (flags&HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 7979 } 7980 7981 /** 7982 * Given a Drawable whose bounds have been set to draw into this view, 7983 * update a Region being computed for {@link #gatherTransparentRegion} so 7984 * that any non-transparent parts of the Drawable are removed from the 7985 * given transparent region. 7986 * 7987 * @param dr The Drawable whose transparency is to be applied to the region. 7988 * @param region A Region holding the current transparency information, 7989 * where any parts of the region that are set are considered to be 7990 * transparent. On return, this region will be modified to have the 7991 * transparency information reduced by the corresponding parts of the 7992 * Drawable that are not transparent. 7993 * {@hide} 7994 */ 7995 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 7996 if (DBG) { 7997 Log.i("View", "Getting transparent region for: " + this); 7998 } 7999 final Region r = dr.getTransparentRegion(); 8000 final Rect db = dr.getBounds(); 8001 final AttachInfo attachInfo = mAttachInfo; 8002 if (r != null && attachInfo != null) { 8003 final int w = getRight()-getLeft(); 8004 final int h = getBottom()-getTop(); 8005 if (db.left > 0) { 8006 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 8007 r.op(0, 0, db.left, h, Region.Op.UNION); 8008 } 8009 if (db.right < w) { 8010 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 8011 r.op(db.right, 0, w, h, Region.Op.UNION); 8012 } 8013 if (db.top > 0) { 8014 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 8015 r.op(0, 0, w, db.top, Region.Op.UNION); 8016 } 8017 if (db.bottom < h) { 8018 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 8019 r.op(0, db.bottom, w, h, Region.Op.UNION); 8020 } 8021 final int[] location = attachInfo.mTransparentLocation; 8022 getLocationInWindow(location); 8023 r.translate(location[0], location[1]); 8024 region.op(r, Region.Op.INTERSECT); 8025 } else { 8026 region.op(db, Region.Op.DIFFERENCE); 8027 } 8028 } 8029 8030 private void postCheckForLongClick() { 8031 mHasPerformedLongPress = false; 8032 8033 if (mPendingCheckForLongPress == null) { 8034 mPendingCheckForLongPress = new CheckForLongPress(); 8035 } 8036 mPendingCheckForLongPress.rememberWindowAttachCount(); 8037 postDelayed(mPendingCheckForLongPress, ViewConfiguration.getLongPressTimeout()); 8038 } 8039 8040 private static int[] stateSetUnion(final int[] stateSet1, 8041 final int[] stateSet2) { 8042 final int stateSet1Length = stateSet1.length; 8043 final int stateSet2Length = stateSet2.length; 8044 final int[] newSet = new int[stateSet1Length + stateSet2Length]; 8045 int k = 0; 8046 int i = 0; 8047 int j = 0; 8048 // This is a merge of the two input state sets and assumes that the 8049 // input sets are sorted by the order imposed by ViewDrawableStates. 8050 for (int viewState : R.styleable.ViewDrawableStates) { 8051 if (i < stateSet1Length && stateSet1[i] == viewState) { 8052 newSet[k++] = viewState; 8053 i++; 8054 } else if (j < stateSet2Length && stateSet2[j] == viewState) { 8055 newSet[k++] = viewState; 8056 j++; 8057 } 8058 if (k > 1) { 8059 assert(newSet[k - 1] > newSet[k - 2]); 8060 } 8061 } 8062 return newSet; 8063 } 8064 8065 /** 8066 * Inflate a view from an XML resource. This convenience method wraps the {@link 8067 * LayoutInflater} class, which provides a full range of options for view inflation. 8068 * 8069 * @param context The Context object for your activity or application. 8070 * @param resource The resource ID to inflate 8071 * @param root A view group that will be the parent. Used to properly inflate the 8072 * layout_* parameters. 8073 * @see LayoutInflater 8074 */ 8075 public static View inflate(Context context, int resource, ViewGroup root) { 8076 LayoutInflater factory = LayoutInflater.from(context); 8077 return factory.inflate(resource, root); 8078 } 8079 8080 /** 8081 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 8082 * Each MeasureSpec represents a requirement for either the width or the height. 8083 * A MeasureSpec is comprised of a size and a mode. There are three possible 8084 * modes: 8085 * <dl> 8086 * <dt>UNSPECIFIED</dt> 8087 * <dd> 8088 * The parent has not imposed any constraint on the child. It can be whatever size 8089 * it wants. 8090 * </dd> 8091 * 8092 * <dt>EXACTLY</dt> 8093 * <dd> 8094 * The parent has determined an exact size for the child. The child is going to be 8095 * given those bounds regardless of how big it wants to be. 8096 * </dd> 8097 * 8098 * <dt>AT_MOST</dt> 8099 * <dd> 8100 * The child can be as large as it wants up to the specified size. 8101 * </dd> 8102 * </dl> 8103 * 8104 * MeasureSpecs are implemented as ints to reduce object allocation. This class 8105 * is provided to pack and unpack the <size, mode> tuple into the int. 8106 */ 8107 public static class MeasureSpec { 8108 private static final int MODE_SHIFT = 30; 8109 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 8110 8111 /** 8112 * Measure specification mode: The parent has not imposed any constraint 8113 * on the child. It can be whatever size it wants. 8114 */ 8115 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 8116 8117 /** 8118 * Measure specification mode: The parent has determined an exact size 8119 * for the child. The child is going to be given those bounds regardless 8120 * of how big it wants to be. 8121 */ 8122 public static final int EXACTLY = 1 << MODE_SHIFT; 8123 8124 /** 8125 * Measure specification mode: The child can be as large as it wants up 8126 * to the specified size. 8127 */ 8128 public static final int AT_MOST = 2 << MODE_SHIFT; 8129 8130 /** 8131 * Creates a measure specification based on the supplied size and mode. 8132 * 8133 * The mode must always be one of the following: 8134 * <ul> 8135 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 8136 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 8137 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 8138 * </ul> 8139 * 8140 * @param size the size of the measure specification 8141 * @param mode the mode of the measure specification 8142 * @return the measure specification based on size and mode 8143 */ 8144 public static int makeMeasureSpec(int size, int mode) { 8145 return size + mode; 8146 } 8147 8148 /** 8149 * Extracts the mode from the supplied measure specification. 8150 * 8151 * @param measureSpec the measure specification to extract the mode from 8152 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 8153 * {@link android.view.View.MeasureSpec#AT_MOST} or 8154 * {@link android.view.View.MeasureSpec#EXACTLY} 8155 */ 8156 public static int getMode(int measureSpec) { 8157 return (measureSpec & MODE_MASK); 8158 } 8159 8160 /** 8161 * Extracts the size from the supplied measure specification. 8162 * 8163 * @param measureSpec the measure specification to extract the size from 8164 * @return the size in pixels defined in the supplied measure specification 8165 */ 8166 public static int getSize(int measureSpec) { 8167 return (measureSpec & ~MODE_MASK); 8168 } 8169 8170 /** 8171 * Returns a String representation of the specified measure 8172 * specification. 8173 * 8174 * @param measureSpec the measure specification to convert to a String 8175 * @return a String with the following format: "MeasureSpec: MODE SIZE" 8176 */ 8177 public static String toString(int measureSpec) { 8178 int mode = getMode(measureSpec); 8179 int size = getSize(measureSpec); 8180 8181 StringBuilder sb = new StringBuilder("MeasureSpec: "); 8182 8183 if (mode == UNSPECIFIED) 8184 sb.append("UNSPECIFIED "); 8185 else if (mode == EXACTLY) 8186 sb.append("EXACTLY "); 8187 else if (mode == AT_MOST) 8188 sb.append("AT_MOST "); 8189 else 8190 sb.append(mode).append(" "); 8191 8192 sb.append(size); 8193 return sb.toString(); 8194 } 8195 } 8196 8197 class CheckForLongPress implements Runnable { 8198 8199 private int mOriginalWindowAttachCount; 8200 8201 public void run() { 8202 if (isPressed() && (mParent != null) 8203 && mOriginalWindowAttachCount == mWindowAttachCount) { 8204 if (performLongClick()) { 8205 mHasPerformedLongPress = true; 8206 } 8207 } 8208 } 8209 8210 public void rememberWindowAttachCount() { 8211 mOriginalWindowAttachCount = mWindowAttachCount; 8212 } 8213 } 8214 8215 /** 8216 * Interface definition for a callback to be invoked when a key event is 8217 * dispatched to this view. The callback will be invoked before the key 8218 * event is given to the view. 8219 */ 8220 public interface OnKeyListener { 8221 /** 8222 * Called when a key is dispatched to a view. This allows listeners to 8223 * get a chance to respond before the target view. 8224 * 8225 * @param v The view the key has been dispatched to. 8226 * @param keyCode The code for the physical key that was pressed 8227 * @param event The KeyEvent object containing full information about 8228 * the event. 8229 * @return True if the listener has consumed the event, false otherwise. 8230 */ 8231 boolean onKey(View v, int keyCode, KeyEvent event); 8232 } 8233 8234 /** 8235 * Interface definition for a callback to be invoked when a touch event is 8236 * dispatched to this view. The callback will be invoked before the touch 8237 * event is given to the view. 8238 */ 8239 public interface OnTouchListener { 8240 /** 8241 * Called when a touch event is dispatched to a view. This allows listeners to 8242 * get a chance to respond before the target view. 8243 * 8244 * @param v The view the touch event has been dispatched to. 8245 * @param event The MotionEvent object containing full information about 8246 * the event. 8247 * @return True if the listener has consumed the event, false otherwise. 8248 */ 8249 boolean onTouch(View v, MotionEvent event); 8250 } 8251 8252 /** 8253 * Interface definition for a callback to be invoked when a view has been clicked and held. 8254 */ 8255 public interface OnLongClickListener { 8256 /** 8257 * Called when a view has been clicked and held. 8258 * 8259 * @param v The view that was clicked and held. 8260 * 8261 * return True if the callback consumed the long click, false otherwise 8262 */ 8263 boolean onLongClick(View v); 8264 } 8265 8266 /** 8267 * Interface definition for a callback to be invoked when the focus state of 8268 * a view changed. 8269 */ 8270 public interface OnFocusChangeListener { 8271 /** 8272 * Called when the focus state of a view has changed. 8273 * 8274 * @param v The view whose state has changed. 8275 * @param hasFocus The new focus state of v. 8276 */ 8277 void onFocusChange(View v, boolean hasFocus); 8278 } 8279 8280 /** 8281 * Interface definition for a callback to be invoked when a view is clicked. 8282 */ 8283 public interface OnClickListener { 8284 /** 8285 * Called when a view has been clicked. 8286 * 8287 * @param v The view that was clicked. 8288 */ 8289 void onClick(View v); 8290 } 8291 8292 /** 8293 * Interface definition for a callback to be invoked when the context menu 8294 * for this view is being built. 8295 */ 8296 public interface OnCreateContextMenuListener { 8297 /** 8298 * Called when the context menu for this view is being built. It is not 8299 * safe to hold onto the menu after this method returns. 8300 * 8301 * @param menu The context menu that is being built 8302 * @param v The view for which the context menu is being built 8303 * @param menuInfo Extra information about the item for which the 8304 * context menu should be shown. This information will vary 8305 * depending on the class of v. 8306 */ 8307 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 8308 } 8309 8310 private final class UnsetPressedState implements Runnable { 8311 public void run() { 8312 setPressed(false); 8313 } 8314 } 8315 8316 /** 8317 * Base class for derived classes that want to save and restore their own 8318 * state in {@link android.view.View#onSaveInstanceState()}. 8319 */ 8320 public static class BaseSavedState extends AbsSavedState { 8321 /** 8322 * Constructor used when reading from a parcel. Reads the state of the superclass. 8323 * 8324 * @param source 8325 */ 8326 public BaseSavedState(Parcel source) { 8327 super(source); 8328 } 8329 8330 /** 8331 * Constructor called by derived classes when creating their SavedState objects 8332 * 8333 * @param superState The state of the superclass of this view 8334 */ 8335 public BaseSavedState(Parcelable superState) { 8336 super(superState); 8337 } 8338 8339 public static final Parcelable.Creator<BaseSavedState> CREATOR = 8340 new Parcelable.Creator<BaseSavedState>() { 8341 public BaseSavedState createFromParcel(Parcel in) { 8342 return new BaseSavedState(in); 8343 } 8344 8345 public BaseSavedState[] newArray(int size) { 8346 return new BaseSavedState[size]; 8347 } 8348 }; 8349 } 8350 8351 /** 8352 * A set of information given to a view when it is attached to its parent 8353 * window. 8354 */ 8355 static class AttachInfo { 8356 interface Callbacks { 8357 void playSoundEffect(int effectId); 8358 boolean performHapticFeedback(int effectId, boolean always); 8359 } 8360 8361 /** 8362 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 8363 * to a Handler. This class contains the target (View) to invalidate and 8364 * the coordinates of the dirty rectangle. 8365 * 8366 * For performance purposes, this class also implements a pool of up to 8367 * POOL_LIMIT objects that get reused. This reduces memory allocations 8368 * whenever possible. 8369 */ 8370 static class InvalidateInfo implements Poolable<InvalidateInfo> { 8371 private static final int POOL_LIMIT = 10; 8372 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 8373 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 8374 public InvalidateInfo newInstance() { 8375 return new InvalidateInfo(); 8376 } 8377 8378 public void onAcquired(InvalidateInfo element) { 8379 } 8380 8381 public void onReleased(InvalidateInfo element) { 8382 } 8383 }, POOL_LIMIT) 8384 ); 8385 8386 private InvalidateInfo mNext; 8387 8388 View target; 8389 8390 int left; 8391 int top; 8392 int right; 8393 int bottom; 8394 8395 public void setNextPoolable(InvalidateInfo element) { 8396 mNext = element; 8397 } 8398 8399 public InvalidateInfo getNextPoolable() { 8400 return mNext; 8401 } 8402 8403 static InvalidateInfo acquire() { 8404 return sPool.acquire(); 8405 } 8406 8407 void release() { 8408 sPool.release(this); 8409 } 8410 } 8411 8412 final IWindowSession mSession; 8413 8414 final IWindow mWindow; 8415 8416 final IBinder mWindowToken; 8417 8418 final Callbacks mRootCallbacks; 8419 8420 /** 8421 * The top view of the hierarchy. 8422 */ 8423 View mRootView; 8424 8425 IBinder mPanelParentWindowToken; 8426 Surface mSurface; 8427 8428 /** 8429 * Left position of this view's window 8430 */ 8431 int mWindowLeft; 8432 8433 /** 8434 * Top position of this view's window 8435 */ 8436 int mWindowTop; 8437 8438 /** 8439 * For windows that are full-screen but using insets to layout inside 8440 * of the screen decorations, these are the current insets for the 8441 * content of the window. 8442 */ 8443 final Rect mContentInsets = new Rect(); 8444 8445 /** 8446 * For windows that are full-screen but using insets to layout inside 8447 * of the screen decorations, these are the current insets for the 8448 * actual visible parts of the window. 8449 */ 8450 final Rect mVisibleInsets = new Rect(); 8451 8452 /** 8453 * The internal insets given by this window. This value is 8454 * supplied by the client (through 8455 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 8456 * be given to the window manager when changed to be used in laying 8457 * out windows behind it. 8458 */ 8459 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 8460 = new ViewTreeObserver.InternalInsetsInfo(); 8461 8462 /** 8463 * All views in the window's hierarchy that serve as scroll containers, 8464 * used to determine if the window can be resized or must be panned 8465 * to adjust for a soft input area. 8466 */ 8467 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 8468 8469 /** 8470 * Indicates whether the view's window currently has the focus. 8471 */ 8472 boolean mHasWindowFocus; 8473 8474 /** 8475 * The current visibility of the window. 8476 */ 8477 int mWindowVisibility; 8478 8479 /** 8480 * Indicates the time at which drawing started to occur. 8481 */ 8482 long mDrawingTime; 8483 8484 /** 8485 * Indicates whether or not ignoring the DIRTY_MASK flags. 8486 */ 8487 boolean mIgnoreDirtyState; 8488 8489 /** 8490 * Indicates whether the view's window is currently in touch mode. 8491 */ 8492 boolean mInTouchMode; 8493 8494 /** 8495 * Indicates that ViewRoot should trigger a global layout change 8496 * the next time it performs a traversal 8497 */ 8498 boolean mRecomputeGlobalAttributes; 8499 8500 /** 8501 * Set to true when attributes (like mKeepScreenOn) need to be 8502 * recomputed. 8503 */ 8504 boolean mAttributesChanged; 8505 8506 /** 8507 * Set during a traveral if any views want to keep the screen on. 8508 */ 8509 boolean mKeepScreenOn; 8510 8511 /** 8512 * Set if the visibility of any views has changed. 8513 */ 8514 boolean mViewVisibilityChanged; 8515 8516 /** 8517 * Set to true if a view has been scrolled. 8518 */ 8519 boolean mViewScrollChanged; 8520 8521 /** 8522 * Global to the view hierarchy used as a temporary for dealing with 8523 * x/y points in the transparent region computations. 8524 */ 8525 final int[] mTransparentLocation = new int[2]; 8526 8527 /** 8528 * Global to the view hierarchy used as a temporary for dealing with 8529 * x/y points in the ViewGroup.invalidateChild implementation. 8530 */ 8531 final int[] mInvalidateChildLocation = new int[2]; 8532 8533 /** 8534 * The view tree observer used to dispatch global events like 8535 * layout, pre-draw, touch mode change, etc. 8536 */ 8537 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 8538 8539 /** 8540 * A Canvas used by the view hierarchy to perform bitmap caching. 8541 */ 8542 Canvas mCanvas; 8543 8544 /** 8545 * A Handler supplied by a view's {@link android.view.ViewRoot}. This 8546 * handler can be used to pump events in the UI events queue. 8547 */ 8548 final Handler mHandler; 8549 8550 /** 8551 * Identifier for messages requesting the view to be invalidated. 8552 * Such messages should be sent to {@link #mHandler}. 8553 */ 8554 static final int INVALIDATE_MSG = 0x1; 8555 8556 /** 8557 * Identifier for messages requesting the view to invalidate a region. 8558 * Such messages should be sent to {@link #mHandler}. 8559 */ 8560 static final int INVALIDATE_RECT_MSG = 0x2; 8561 8562 /** 8563 * Temporary for use in computing invalidate rectangles while 8564 * calling up the hierarchy. 8565 */ 8566 final Rect mTmpInvalRect = new Rect(); 8567 8568 /** 8569 * Temporary list for use in collecting focusable descendents of a view. 8570 */ 8571 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 8572 8573 /** 8574 * Creates a new set of attachment information with the specified 8575 * events handler and thread. 8576 * 8577 * @param handler the events handler the view must use 8578 */ 8579 AttachInfo(IWindowSession session, IWindow window, 8580 Handler handler, Callbacks effectPlayer) { 8581 mSession = session; 8582 mWindow = window; 8583 mWindowToken = window.asBinder(); 8584 mHandler = handler; 8585 mRootCallbacks = effectPlayer; 8586 } 8587 } 8588 8589 /** 8590 * <p>ScrollabilityCache holds various fields used by a View when scrolling 8591 * is supported. This avoids keeping too many unused fields in most 8592 * instances of View.</p> 8593 */ 8594 private static class ScrollabilityCache { 8595 public int fadingEdgeLength; 8596 8597 public int scrollBarSize; 8598 public ScrollBarDrawable scrollBar; 8599 8600 public final Paint paint; 8601 public final Matrix matrix; 8602 public Shader shader; 8603 8604 private int mLastColor; 8605 8606 public ScrollabilityCache(ViewConfiguration configuration) { 8607 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 8608 scrollBarSize = configuration.getScaledScrollBarSize(); 8609 8610 paint = new Paint(); 8611 matrix = new Matrix(); 8612 // use use a height of 1, and then wack the matrix each time we 8613 // actually use it. 8614 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 8615 8616 paint.setShader(shader); 8617 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 8618 } 8619 8620 public void setFadeColor(int color) { 8621 if (color != 0 && color != mLastColor) { 8622 mLastColor = color; 8623 color |= 0xFF000000; 8624 8625 shader = new LinearGradient(0, 0, 0, 1, color, 0, Shader.TileMode.CLAMP); 8626 8627 paint.setShader(shader); 8628 // Restore the default transfer mode (src_over) 8629 paint.setXfermode(null); 8630 } 8631 } 8632 } 8633} 8634