Fragment.java revision 6c285977a0dc9605348bd9530282c7d006cbf8bd
1/* 2 * Copyright (C) 2010 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.app; 18 19import android.animation.Animator; 20import android.content.ComponentCallbacks2; 21import android.content.Context; 22import android.content.Intent; 23import android.content.res.Configuration; 24import android.content.res.Resources; 25import android.os.Bundle; 26import android.os.Parcel; 27import android.os.Parcelable; 28import android.util.AndroidRuntimeException; 29import android.util.AttributeSet; 30import android.util.DebugUtils; 31import android.util.SparseArray; 32import android.view.ContextMenu; 33import android.view.ContextMenu.ContextMenuInfo; 34import android.view.LayoutInflater; 35import android.view.Menu; 36import android.view.MenuInflater; 37import android.view.MenuItem; 38import android.view.View; 39import android.view.View.OnCreateContextMenuListener; 40import android.view.ViewGroup; 41import android.widget.AdapterView; 42 43import java.io.FileDescriptor; 44import java.io.PrintWriter; 45import java.util.HashMap; 46 47final class FragmentState implements Parcelable { 48 final String mClassName; 49 final int mIndex; 50 final boolean mFromLayout; 51 final int mFragmentId; 52 final int mContainerId; 53 final String mTag; 54 final boolean mRetainInstance; 55 final boolean mDetached; 56 final Bundle mArguments; 57 58 Bundle mSavedFragmentState; 59 60 Fragment mInstance; 61 62 public FragmentState(Fragment frag) { 63 mClassName = frag.getClass().getName(); 64 mIndex = frag.mIndex; 65 mFromLayout = frag.mFromLayout; 66 mFragmentId = frag.mFragmentId; 67 mContainerId = frag.mContainerId; 68 mTag = frag.mTag; 69 mRetainInstance = frag.mRetainInstance; 70 mDetached = frag.mDetached; 71 mArguments = frag.mArguments; 72 } 73 74 public FragmentState(Parcel in) { 75 mClassName = in.readString(); 76 mIndex = in.readInt(); 77 mFromLayout = in.readInt() != 0; 78 mFragmentId = in.readInt(); 79 mContainerId = in.readInt(); 80 mTag = in.readString(); 81 mRetainInstance = in.readInt() != 0; 82 mDetached = in.readInt() != 0; 83 mArguments = in.readBundle(); 84 mSavedFragmentState = in.readBundle(); 85 } 86 87 public Fragment instantiate(Activity activity) { 88 if (mInstance != null) { 89 return mInstance; 90 } 91 92 if (mArguments != null) { 93 mArguments.setClassLoader(activity.getClassLoader()); 94 } 95 96 mInstance = Fragment.instantiate(activity, mClassName, mArguments); 97 98 if (mSavedFragmentState != null) { 99 mSavedFragmentState.setClassLoader(activity.getClassLoader()); 100 mInstance.mSavedFragmentState = mSavedFragmentState; 101 } 102 mInstance.setIndex(mIndex); 103 mInstance.mFromLayout = mFromLayout; 104 mInstance.mRestored = true; 105 mInstance.mFragmentId = mFragmentId; 106 mInstance.mContainerId = mContainerId; 107 mInstance.mTag = mTag; 108 mInstance.mRetainInstance = mRetainInstance; 109 mInstance.mDetached = mDetached; 110 mInstance.mFragmentManager = activity.mFragments; 111 112 return mInstance; 113 } 114 115 public int describeContents() { 116 return 0; 117 } 118 119 public void writeToParcel(Parcel dest, int flags) { 120 dest.writeString(mClassName); 121 dest.writeInt(mIndex); 122 dest.writeInt(mFromLayout ? 1 : 0); 123 dest.writeInt(mFragmentId); 124 dest.writeInt(mContainerId); 125 dest.writeString(mTag); 126 dest.writeInt(mRetainInstance ? 1 : 0); 127 dest.writeInt(mDetached ? 1 : 0); 128 dest.writeBundle(mArguments); 129 dest.writeBundle(mSavedFragmentState); 130 } 131 132 public static final Parcelable.Creator<FragmentState> CREATOR 133 = new Parcelable.Creator<FragmentState>() { 134 public FragmentState createFromParcel(Parcel in) { 135 return new FragmentState(in); 136 } 137 138 public FragmentState[] newArray(int size) { 139 return new FragmentState[size]; 140 } 141 }; 142} 143 144/** 145 * A Fragment is a piece of an application's user interface or behavior 146 * that can be placed in an {@link Activity}. Interaction with fragments 147 * is done through {@link FragmentManager}, which can be obtained via 148 * {@link Activity#getFragmentManager() Activity.getFragmentManager()} and 149 * {@link Fragment#getFragmentManager() Fragment.getFragmentManager()}. 150 * 151 * <p>The Fragment class can be used many ways to achieve a wide variety of 152 * results. It is core, it represents a particular operation or interface 153 * that is running within a larger {@link Activity}. A Fragment is closely 154 * tied to the Activity it is in, and can not be used apart from one. Though 155 * Fragment defines its own lifecycle, that lifecycle is dependent on its 156 * activity: if the activity is stopped, no fragments inside of it can be 157 * started; when the activity is destroyed, all fragments will be destroyed. 158 * 159 * <p>All subclasses of Fragment must include a public empty constructor. 160 * The framework will often re-instantiate a fragment class when needed, 161 * in particular during state restore, and needs to be able to find this 162 * constructor to instantiate it. If the empty constructor is not available, 163 * a runtime exception will occur in some cases during state restore. 164 * 165 * <p>For more documentation, also see the <a 166 * href="{@docRoot}guide/topics/fundamentals/fragments.html">Fragments</a> developer guide.</p> 167 * 168 * <p>Topics covered here: 169 * <ol> 170 * <li><a href="#OlderPlatforms">Older Platforms</a> 171 * <li><a href="#Lifecycle">Lifecycle</a> 172 * <li><a href="#Layout">Layout</a> 173 * <li><a href="#BackStack">Back Stack</a> 174 * </ol> 175 * 176 * <a name="OlderPlatforms"></a> 177 * <h3>Older Platforms</h3> 178 * 179 * While the Fragment API was introduced in 180 * {@link android.os.Build.VERSION_CODES#HONEYCOMB}, a version of the API 181 * is also available for use on older platforms. See the blog post 182 * <a href="http://android-developers.blogspot.com/2011/03/fragments-for-all.html"> 183 * Fragments For All</a> for more details. 184 * 185 * <a name="Lifecycle"></a> 186 * <h3>Lifecycle</h3> 187 * 188 * <p>Though a Fragment's lifecycle is tied to its owning activity, it has 189 * its own wrinkle on the standard activity lifecycle. It includes basic 190 * activity lifecycle methods such as {@link #onResume}, but also important 191 * are methods related to interactions with the activity and UI generation. 192 * 193 * <p>The core series of lifecycle methods that are called to bring a fragment 194 * up to resumed state (interacting with the user) are: 195 * 196 * <ol> 197 * <li> {@link #onAttach} called once the fragment is associated with its activity. 198 * <li> {@link #onCreate} called to do initial creation of the fragment. 199 * <li> {@link #onCreateView} creates and returns the view hierarchy associated 200 * with the fragment. 201 * <li> {@link #onActivityCreated} tells the fragment that its activity has 202 * completed its own {@link Activity#onCreate Activity.onCreaate}. 203 * <li> {@link #onStart} makes the fragment visible to the user (based on its 204 * containing activity being started). 205 * <li> {@link #onResume} makes the fragment interacting with the user (based on its 206 * containing activity being resumed). 207 * </ol> 208 * 209 * <p>As a fragment is no longer being used, it goes through a reverse 210 * series of callbacks: 211 * 212 * <ol> 213 * <li> {@link #onPause} fragment is no longer interacting with the user either 214 * because its activity is being paused or a fragment operation is modifying it 215 * in the activity. 216 * <li> {@link #onStop} fragment is no longer visible to the user either 217 * because its activity is being stopped or a fragment operation is modifying it 218 * in the activity. 219 * <li> {@link #onDestroyView} allows the fragment to clean up resources 220 * associated with its View. 221 * <li> {@link #onDestroy} called to do final cleanup of the fragment's state. 222 * <li> {@link #onDetach} called immediately prior to the fragment no longer 223 * being associated with its activity. 224 * </ol> 225 * 226 * <a name="Layout"></a> 227 * <h3>Layout</h3> 228 * 229 * <p>Fragments can be used as part of your application's layout, allowing 230 * you to better modularize your code and more easily adjust your user 231 * interface to the screen it is running on. As an example, we can look 232 * at a simple program consisting of a list of items, and display of the 233 * details of each item.</p> 234 * 235 * <p>An activity's layout XML can include <code><fragment></code> tags 236 * to embed fragment instances inside of the layout. For example, here is 237 * a simple layout that embeds one fragment:</p> 238 * 239 * {@sample development/samples/ApiDemos/res/layout/fragment_layout.xml layout} 240 * 241 * <p>The layout is installed in the activity in the normal way:</p> 242 * 243 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 244 * main} 245 * 246 * <p>The titles fragment, showing a list of titles, is fairly simple, relying 247 * on {@link ListFragment} for most of its work. Note the implementation of 248 * clicking an item: depending on the current activity's layout, it can either 249 * create and display a new fragment to show the details in-place (more about 250 * this later), or start a new activity to show the details.</p> 251 * 252 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 253 * titles} 254 * 255 * <p>The details fragment showing the contents of a selected item just 256 * displays a string of text based on an index of a string array built in to 257 * the app:</p> 258 * 259 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 260 * details} 261 * 262 * <p>In this case when the user clicks on a title, there is no details 263 * container in the current activity, so the titles fragment's click code will 264 * launch a new activity to display the details fragment:</p> 265 * 266 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 267 * details_activity} 268 * 269 * <p>However the screen may be large enough to show both the list of titles 270 * and details about the currently selected title. To use such a layout on 271 * a landscape screen, this alternative layout can be placed under layout-land:</p> 272 * 273 * {@sample development/samples/ApiDemos/res/layout-land/fragment_layout.xml layout} 274 * 275 * <p>Note how the prior code will adjust to this alternative UI flow: the titles 276 * fragment will now embed the details fragment inside of this activity, and the 277 * details activity will finish itself if it is running in a configuration 278 * where the details can be shown in-place. 279 * 280 * <p>When a configuration change causes the activity hosting these fragments 281 * to restart, its new instance may use a different layout that doesn't 282 * include the same fragments as the previous layout. In this case all of 283 * the previous fragments will still be instantiated and running in the new 284 * instance. However, any that are no longer associated with a <fragment> 285 * tag in the view hierarchy will not have their content view created 286 * and will return false from {@link #isInLayout}. (The code here also shows 287 * how you can determine if a fragment placed in a container is no longer 288 * running in a layout with that container and avoid creating its view hierarchy 289 * in that case.) 290 * 291 * <p>The attributes of the <fragment> tag are used to control the 292 * LayoutParams provided when attaching the fragment's view to the parent 293 * container. They can also be parsed by the fragment in {@link #onInflate} 294 * as parameters. 295 * 296 * <p>The fragment being instantiated must have some kind of unique identifier 297 * so that it can be re-associated with a previous instance if the parent 298 * activity needs to be destroyed and recreated. This can be provided these 299 * ways: 300 * 301 * <ul> 302 * <li>If nothing is explicitly supplied, the view ID of the container will 303 * be used. 304 * <li><code>android:tag</code> can be used in <fragment> to provide 305 * a specific tag name for the fragment. 306 * <li><code>android:id</code> can be used in <fragment> to provide 307 * a specific identifier for the fragment. 308 * </ul> 309 * 310 * <a name="BackStack"></a> 311 * <h3>Back Stack</h3> 312 * 313 * <p>The transaction in which fragments are modified can be placed on an 314 * internal back-stack of the owning activity. When the user presses back 315 * in the activity, any transactions on the back stack are popped off before 316 * the activity itself is finished. 317 * 318 * <p>For example, consider this simple fragment that is instantiated with 319 * an integer argument and displays that in a TextView in its UI:</p> 320 * 321 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentStack.java 322 * fragment} 323 * 324 * <p>A function that creates a new instance of the fragment, replacing 325 * whatever current fragment instance is being shown and pushing that change 326 * on to the back stack could be written as: 327 * 328 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentStack.java 329 * add_stack} 330 * 331 * <p>After each call to this function, a new entry is on the stack, and 332 * pressing back will pop it to return the user to whatever previous state 333 * the activity UI was in. 334 */ 335public class Fragment implements ComponentCallbacks2, OnCreateContextMenuListener { 336 private static final HashMap<String, Class<?>> sClassMap = 337 new HashMap<String, Class<?>>(); 338 339 static final int INITIALIZING = 0; // Not yet created. 340 static final int CREATED = 1; // Created. 341 static final int ACTIVITY_CREATED = 2; // The activity has finished its creation. 342 static final int STOPPED = 3; // Fully created, not started. 343 static final int STARTED = 4; // Created and started, not resumed. 344 static final int RESUMED = 5; // Created started and resumed. 345 346 int mState = INITIALIZING; 347 348 // Non-null if the fragment's view hierarchy is currently animating away, 349 // meaning we need to wait a bit on completely destroying it. This is the 350 // animation that is running. 351 Animator mAnimatingAway; 352 353 // If mAnimatingAway != null, this is the state we should move to once the 354 // animation is done. 355 int mStateAfterAnimating; 356 357 // When instantiated from saved state, this is the saved state. 358 Bundle mSavedFragmentState; 359 SparseArray<Parcelable> mSavedViewState; 360 361 // Index into active fragment array. 362 int mIndex = -1; 363 364 // Internal unique name for this fragment; 365 String mWho; 366 367 // Construction arguments; 368 Bundle mArguments; 369 370 // Target fragment. 371 Fragment mTarget; 372 373 // For use when retaining a fragment: this is the index of the last mTarget. 374 int mTargetIndex = -1; 375 376 // Target request code. 377 int mTargetRequestCode; 378 379 // True if the fragment is in the list of added fragments. 380 boolean mAdded; 381 382 // If set this fragment is being removed from its activity. 383 boolean mRemoving; 384 385 // True if the fragment is in the resumed state. 386 boolean mResumed; 387 388 // Set to true if this fragment was instantiated from a layout file. 389 boolean mFromLayout; 390 391 // Set to true when the view has actually been inflated in its layout. 392 boolean mInLayout; 393 394 // True if this fragment has been restored from previously saved state. 395 boolean mRestored; 396 397 // Number of active back stack entries this fragment is in. 398 int mBackStackNesting; 399 400 // The fragment manager we are associated with. Set as soon as the 401 // fragment is used in a transaction; cleared after it has been removed 402 // from all transactions. 403 FragmentManager mFragmentManager; 404 405 // Activity this fragment is attached to. 406 Activity mActivity; 407 408 // The optional identifier for this fragment -- either the container ID if it 409 // was dynamically added to the view hierarchy, or the ID supplied in 410 // layout. 411 int mFragmentId; 412 413 // When a fragment is being dynamically added to the view hierarchy, this 414 // is the identifier of the parent container it is being added to. 415 int mContainerId; 416 417 // The optional named tag for this fragment -- usually used to find 418 // fragments that are not part of the layout. 419 String mTag; 420 421 // Set to true when the app has requested that this fragment be hidden 422 // from the user. 423 boolean mHidden; 424 425 // Set to true when the app has requested that this fragment be detached. 426 boolean mDetached; 427 428 // If set this fragment would like its instance retained across 429 // configuration changes. 430 boolean mRetainInstance; 431 432 // If set this fragment is being retained across the current config change. 433 boolean mRetaining; 434 435 // If set this fragment has menu items to contribute. 436 boolean mHasMenu; 437 438 // Set to true to allow the fragment's menu to be shown. 439 boolean mMenuVisible = true; 440 441 // Used to verify that subclasses call through to super class. 442 boolean mCalled; 443 444 // If app has requested a specific animation, this is the one to use. 445 int mNextAnim; 446 447 // The parent container of the fragment after dynamically added to UI. 448 ViewGroup mContainer; 449 450 // The View generated for this fragment. 451 View mView; 452 453 LoaderManagerImpl mLoaderManager; 454 boolean mLoadersStarted; 455 boolean mCheckedForLoaderManager; 456 457 /** 458 * State information that has been retrieved from a fragment instance 459 * through {@link FragmentManager#saveFragmentInstanceState(Fragment) 460 * FragmentManager.saveFragmentInstanceState}. 461 */ 462 public static class SavedState implements Parcelable { 463 final Bundle mState; 464 465 SavedState(Bundle state) { 466 mState = state; 467 } 468 469 SavedState(Parcel in, ClassLoader loader) { 470 mState = in.readBundle(); 471 if (loader != null && mState != null) { 472 mState.setClassLoader(loader); 473 } 474 } 475 476 @Override 477 public int describeContents() { 478 return 0; 479 } 480 481 @Override 482 public void writeToParcel(Parcel dest, int flags) { 483 dest.writeBundle(mState); 484 } 485 486 public static final Parcelable.ClassLoaderCreator<SavedState> CREATOR 487 = new Parcelable.ClassLoaderCreator<SavedState>() { 488 public SavedState createFromParcel(Parcel in) { 489 return new SavedState(in, null); 490 } 491 492 public SavedState createFromParcel(Parcel in, ClassLoader loader) { 493 return new SavedState(in, loader); 494 } 495 496 public SavedState[] newArray(int size) { 497 return new SavedState[size]; 498 } 499 }; 500 } 501 502 /** 503 * Thrown by {@link Fragment#instantiate(Context, String, Bundle)} when 504 * there is an instantiation failure. 505 */ 506 static public class InstantiationException extends AndroidRuntimeException { 507 public InstantiationException(String msg, Exception cause) { 508 super(msg, cause); 509 } 510 } 511 512 /** 513 * Default constructor. <strong>Every</strong> fragment must have an 514 * empty constructor, so it can be instantiated when restoring its 515 * activity's state. It is strongly recommended that subclasses do not 516 * have other constructors with parameters, since these constructors 517 * will not be called when the fragment is re-instantiated; instead, 518 * arguments can be supplied by the caller with {@link #setArguments} 519 * and later retrieved by the Fragment with {@link #getArguments}. 520 * 521 * <p>Applications should generally not implement a constructor. The 522 * first place application code an run where the fragment is ready to 523 * be used is in {@link #onAttach(Activity)}, the point where the fragment 524 * is actually associated with its activity. Some applications may also 525 * want to implement {@link #onInflate} to retrieve attributes from a 526 * layout resource, though should take care here because this happens for 527 * the fragment is attached to its activity. 528 */ 529 public Fragment() { 530 } 531 532 /** 533 * Like {@link #instantiate(Context, String, Bundle)} but with a null 534 * argument Bundle. 535 */ 536 public static Fragment instantiate(Context context, String fname) { 537 return instantiate(context, fname, null); 538 } 539 540 /** 541 * Create a new instance of a Fragment with the given class name. This is 542 * the same as calling its empty constructor. 543 * 544 * @param context The calling context being used to instantiate the fragment. 545 * This is currently just used to get its ClassLoader. 546 * @param fname The class name of the fragment to instantiate. 547 * @param args Bundle of arguments to supply to the fragment, which it 548 * can retrieve with {@link #getArguments()}. May be null. 549 * @return Returns a new fragment instance. 550 * @throws InstantiationException If there is a failure in instantiating 551 * the given fragment class. This is a runtime exception; it is not 552 * normally expected to happen. 553 */ 554 public static Fragment instantiate(Context context, String fname, Bundle args) { 555 try { 556 Class<?> clazz = sClassMap.get(fname); 557 if (clazz == null) { 558 // Class not found in the cache, see if it's real, and try to add it 559 clazz = context.getClassLoader().loadClass(fname); 560 sClassMap.put(fname, clazz); 561 } 562 Fragment f = (Fragment)clazz.newInstance(); 563 if (args != null) { 564 args.setClassLoader(f.getClass().getClassLoader()); 565 f.mArguments = args; 566 } 567 return f; 568 } catch (ClassNotFoundException e) { 569 throw new InstantiationException("Unable to instantiate fragment " + fname 570 + ": make sure class name exists, is public, and has an" 571 + " empty constructor that is public", e); 572 } catch (java.lang.InstantiationException e) { 573 throw new InstantiationException("Unable to instantiate fragment " + fname 574 + ": make sure class name exists, is public, and has an" 575 + " empty constructor that is public", e); 576 } catch (IllegalAccessException e) { 577 throw new InstantiationException("Unable to instantiate fragment " + fname 578 + ": make sure class name exists, is public, and has an" 579 + " empty constructor that is public", e); 580 } 581 } 582 583 final void restoreViewState() { 584 if (mSavedViewState != null) { 585 mView.restoreHierarchyState(mSavedViewState); 586 mSavedViewState = null; 587 } 588 } 589 590 final void setIndex(int index) { 591 mIndex = index; 592 mWho = "android:fragment:" + mIndex; 593 } 594 595 final boolean isInBackStack() { 596 return mBackStackNesting > 0; 597 } 598 599 /** 600 * Subclasses can not override equals(). 601 */ 602 @Override final public boolean equals(Object o) { 603 return super.equals(o); 604 } 605 606 /** 607 * Subclasses can not override hashCode(). 608 */ 609 @Override final public int hashCode() { 610 return super.hashCode(); 611 } 612 613 @Override 614 public String toString() { 615 StringBuilder sb = new StringBuilder(128); 616 DebugUtils.buildShortClassTag(this, sb); 617 if (mIndex >= 0) { 618 sb.append(" #"); 619 sb.append(mIndex); 620 } 621 if (mFragmentId != 0) { 622 sb.append(" id=0x"); 623 sb.append(Integer.toHexString(mFragmentId)); 624 } 625 if (mTag != null) { 626 sb.append(" "); 627 sb.append(mTag); 628 } 629 sb.append('}'); 630 return sb.toString(); 631 } 632 633 /** 634 * Return the identifier this fragment is known by. This is either 635 * the android:id value supplied in a layout or the container view ID 636 * supplied when adding the fragment. 637 */ 638 final public int getId() { 639 return mFragmentId; 640 } 641 642 /** 643 * Get the tag name of the fragment, if specified. 644 */ 645 final public String getTag() { 646 return mTag; 647 } 648 649 /** 650 * Supply the construction arguments for this fragment. This can only 651 * be called before the fragment has been attached to its activity; that 652 * is, you should call it immediately after constructing the fragment. The 653 * arguments supplied here will be retained across fragment destroy and 654 * creation. 655 */ 656 public void setArguments(Bundle args) { 657 if (mIndex >= 0) { 658 throw new IllegalStateException("Fragment already active"); 659 } 660 mArguments = args; 661 } 662 663 /** 664 * Return the arguments supplied when the fragment was instantiated, 665 * if any. 666 */ 667 final public Bundle getArguments() { 668 return mArguments; 669 } 670 671 /** 672 * Set the initial saved state that this Fragment should restore itself 673 * from when first being constructed, as returned by 674 * {@link FragmentManager#saveFragmentInstanceState(Fragment) 675 * FragmentManager.saveFragmentInstanceState}. 676 * 677 * @param state The state the fragment should be restored from. 678 */ 679 public void setInitialSavedState(SavedState state) { 680 if (mIndex >= 0) { 681 throw new IllegalStateException("Fragment already active"); 682 } 683 mSavedFragmentState = state != null && state.mState != null 684 ? state.mState : null; 685 } 686 687 /** 688 * Optional target for this fragment. This may be used, for example, 689 * if this fragment is being started by another, and when done wants to 690 * give a result back to the first. The target set here is retained 691 * across instances via {@link FragmentManager#putFragment 692 * FragmentManager.putFragment()}. 693 * 694 * @param fragment The fragment that is the target of this one. 695 * @param requestCode Optional request code, for convenience if you 696 * are going to call back with {@link #onActivityResult(int, int, Intent)}. 697 */ 698 public void setTargetFragment(Fragment fragment, int requestCode) { 699 mTarget = fragment; 700 mTargetRequestCode = requestCode; 701 } 702 703 /** 704 * Return the target fragment set by {@link #setTargetFragment}. 705 */ 706 final public Fragment getTargetFragment() { 707 return mTarget; 708 } 709 710 /** 711 * Return the target request code set by {@link #setTargetFragment}. 712 */ 713 final public int getTargetRequestCode() { 714 return mTargetRequestCode; 715 } 716 717 /** 718 * Return the Activity this fragment is currently associated with. 719 */ 720 final public Activity getActivity() { 721 return mActivity; 722 } 723 724 /** 725 * Return <code>getActivity().getResources()</code>. 726 */ 727 final public Resources getResources() { 728 if (mActivity == null) { 729 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 730 } 731 return mActivity.getResources(); 732 } 733 734 /** 735 * Return a localized, styled CharSequence from the application's package's 736 * default string table. 737 * 738 * @param resId Resource id for the CharSequence text 739 */ 740 public final CharSequence getText(int resId) { 741 return getResources().getText(resId); 742 } 743 744 /** 745 * Return a localized string from the application's package's 746 * default string table. 747 * 748 * @param resId Resource id for the string 749 */ 750 public final String getString(int resId) { 751 return getResources().getString(resId); 752 } 753 754 /** 755 * Return a localized formatted string from the application's package's 756 * default string table, substituting the format arguments as defined in 757 * {@link java.util.Formatter} and {@link java.lang.String#format}. 758 * 759 * @param resId Resource id for the format string 760 * @param formatArgs The format arguments that will be used for substitution. 761 */ 762 763 public final String getString(int resId, Object... formatArgs) { 764 return getResources().getString(resId, formatArgs); 765 } 766 767 /** 768 * Return the FragmentManager for interacting with fragments associated 769 * with this fragment's activity. Note that this will be non-null slightly 770 * before {@link #getActivity()}, during the time from when the fragment is 771 * placed in a {@link FragmentTransaction} until it is committed and 772 * attached to its activity. 773 */ 774 final public FragmentManager getFragmentManager() { 775 return mFragmentManager; 776 } 777 778 /** 779 * Return true if the fragment is currently added to its activity. 780 */ 781 final public boolean isAdded() { 782 return mActivity != null && mAdded; 783 } 784 785 /** 786 * Return true if the fragment has been explicitly detached from the UI. 787 * That is, {@link FragmentTransaction#detach(Fragment) 788 * FragmentTransaction.detach(Fragment)} has been used on it. 789 */ 790 final public boolean isDetached() { 791 return mDetached; 792 } 793 794 /** 795 * Return true if this fragment is currently being removed from its 796 * activity. This is <em>not</em> whether its activity is finishing, but 797 * rather whether it is in the process of being removed from its activity. 798 */ 799 final public boolean isRemoving() { 800 return mRemoving; 801 } 802 803 /** 804 * Return true if the layout is included as part of an activity view 805 * hierarchy via the <fragment> tag. This will always be true when 806 * fragments are created through the <fragment> tag, <em>except</em> 807 * in the case where an old fragment is restored from a previous state and 808 * it does not appear in the layout of the current state. 809 */ 810 final public boolean isInLayout() { 811 return mInLayout; 812 } 813 814 /** 815 * Return true if the fragment is in the resumed state. This is true 816 * for the duration of {@link #onResume()} and {@link #onPause()} as well. 817 */ 818 final public boolean isResumed() { 819 return mResumed; 820 } 821 822 /** 823 * Return true if the fragment is currently visible to the user. This means 824 * it: (1) has been added, (2) has its view attached to the window, and 825 * (3) is not hidden. 826 */ 827 final public boolean isVisible() { 828 return isAdded() && !isHidden() && mView != null 829 && mView.getWindowToken() != null && mView.getVisibility() == View.VISIBLE; 830 } 831 832 /** 833 * Return true if the fragment has been hidden. By default fragments 834 * are shown. You can find out about changes to this state with 835 * {@link #onHiddenChanged}. Note that the hidden state is orthogonal 836 * to other states -- that is, to be visible to the user, a fragment 837 * must be both started and not hidden. 838 */ 839 final public boolean isHidden() { 840 return mHidden; 841 } 842 843 /** 844 * Called when the hidden state (as returned by {@link #isHidden()} of 845 * the fragment has changed. Fragments start out not hidden; this will 846 * be called whenever the fragment changes state from that. 847 * @param hidden True if the fragment is now hidden, false if it is not 848 * visible. 849 */ 850 public void onHiddenChanged(boolean hidden) { 851 } 852 853 /** 854 * Control whether a fragment instance is retained across Activity 855 * re-creation (such as from a configuration change). This can only 856 * be used with fragments not in the back stack. If set, the fragment 857 * lifecycle will be slightly different when an activity is recreated: 858 * <ul> 859 * <li> {@link #onDestroy()} will not be called (but {@link #onDetach()} still 860 * will be, because the fragment is being detached from its current activity). 861 * <li> {@link #onCreate(Bundle)} will not be called since the fragment 862 * is not being re-created. 863 * <li> {@link #onAttach(Activity)} and {@link #onActivityCreated(Bundle)} <b>will</b> 864 * still be called. 865 * </ul> 866 */ 867 public void setRetainInstance(boolean retain) { 868 mRetainInstance = retain; 869 } 870 871 final public boolean getRetainInstance() { 872 return mRetainInstance; 873 } 874 875 /** 876 * Report that this fragment would like to participate in populating 877 * the options menu by receiving a call to {@link #onCreateOptionsMenu} 878 * and related methods. 879 * 880 * @param hasMenu If true, the fragment has menu items to contribute. 881 */ 882 public void setHasOptionsMenu(boolean hasMenu) { 883 if (mHasMenu != hasMenu) { 884 mHasMenu = hasMenu; 885 if (isAdded() && !isHidden()) { 886 mFragmentManager.invalidateOptionsMenu(); 887 } 888 } 889 } 890 891 /** 892 * Set a hint for whether this fragment's menu should be visible. This 893 * is useful if you know that a fragment has been placed in your view 894 * hierarchy so that the user can not currently seen it, so any menu items 895 * it has should also not be shown. 896 * 897 * @param menuVisible The default is true, meaning the fragment's menu will 898 * be shown as usual. If false, the user will not see the menu. 899 */ 900 public void setMenuVisibility(boolean menuVisible) { 901 if (mMenuVisible != menuVisible) { 902 mMenuVisible = menuVisible; 903 if (mHasMenu && isAdded() && !isHidden()) { 904 mFragmentManager.invalidateOptionsMenu(); 905 } 906 } 907 } 908 909 /** 910 * Return the LoaderManager for this fragment, creating it if needed. 911 */ 912 public LoaderManager getLoaderManager() { 913 if (mLoaderManager != null) { 914 return mLoaderManager; 915 } 916 if (mActivity == null) { 917 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 918 } 919 mCheckedForLoaderManager = true; 920 mLoaderManager = mActivity.getLoaderManager(mIndex, mLoadersStarted, true); 921 return mLoaderManager; 922 } 923 924 /** 925 * Call {@link Activity#startActivity(Intent)} on the fragment's 926 * containing Activity. 927 */ 928 public void startActivity(Intent intent) { 929 if (mActivity == null) { 930 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 931 } 932 mActivity.startActivityFromFragment(this, intent, -1); 933 } 934 935 /** 936 * Call {@link Activity#startActivityForResult(Intent, int)} on the fragment's 937 * containing Activity. 938 */ 939 public void startActivityForResult(Intent intent, int requestCode) { 940 if (mActivity == null) { 941 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 942 } 943 mActivity.startActivityFromFragment(this, intent, requestCode); 944 } 945 946 /** 947 * Receive the result from a previous call to 948 * {@link #startActivityForResult(Intent, int)}. This follows the 949 * related Activity API as described there in 950 * {@link Activity#onActivityResult(int, int, Intent)}. 951 * 952 * @param requestCode The integer request code originally supplied to 953 * startActivityForResult(), allowing you to identify who this 954 * result came from. 955 * @param resultCode The integer result code returned by the child activity 956 * through its setResult(). 957 * @param data An Intent, which can return result data to the caller 958 * (various data can be attached to Intent "extras"). 959 */ 960 public void onActivityResult(int requestCode, int resultCode, Intent data) { 961 } 962 963 /** 964 * @hide Hack so that DialogFragment can make its Dialog before creating 965 * its views, and the view construction can use the dialog's context for 966 * inflation. Maybe this should become a public API. Note sure. 967 */ 968 public LayoutInflater getLayoutInflater(Bundle savedInstanceState) { 969 return mActivity.getLayoutInflater(); 970 } 971 972 /** 973 * @deprecated Use {@link #onInflate(Activity, AttributeSet, Bundle)} instead. 974 */ 975 @Deprecated 976 public void onInflate(AttributeSet attrs, Bundle savedInstanceState) { 977 mCalled = true; 978 } 979 980 /** 981 * Called when a fragment is being created as part of a view layout 982 * inflation, typically from setting the content view of an activity. This 983 * may be called immediately after the fragment is created from a <fragment> 984 * tag in a layout file. Note this is <em>before</em> the fragment's 985 * {@link #onAttach(Activity)} has been called; all you should do here is 986 * parse the attributes and save them away. 987 * 988 * <p>This is called every time the fragment is inflated, even if it is 989 * being inflated into a new instance with saved state. It typically makes 990 * sense to re-parse the parameters each time, to allow them to change with 991 * different configurations.</p> 992 * 993 * <p>Here is a typical implementation of a fragment that can take parameters 994 * both through attributes supplied here as well from {@link #getArguments()}:</p> 995 * 996 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentArguments.java 997 * fragment} 998 * 999 * <p>Note that parsing the XML attributes uses a "styleable" resource. The 1000 * declaration for the styleable used here is:</p> 1001 * 1002 * {@sample development/samples/ApiDemos/res/values/attrs.xml fragment_arguments} 1003 * 1004 * <p>The fragment can then be declared within its activity's content layout 1005 * through a tag like this:</p> 1006 * 1007 * {@sample development/samples/ApiDemos/res/layout/fragment_arguments.xml from_attributes} 1008 * 1009 * <p>This fragment can also be created dynamically from arguments given 1010 * at runtime in the arguments Bundle; here is an example of doing so at 1011 * creation of the containing activity:</p> 1012 * 1013 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentArguments.java 1014 * create} 1015 * 1016 * @param activity The Activity that is inflating this fragment. 1017 * @param attrs The attributes at the tag where the fragment is 1018 * being created. 1019 * @param savedInstanceState If the fragment is being re-created from 1020 * a previous saved state, this is the state. 1021 */ 1022 public void onInflate(Activity activity, AttributeSet attrs, Bundle savedInstanceState) { 1023 onInflate(attrs, savedInstanceState); 1024 mCalled = true; 1025 } 1026 1027 /** 1028 * Called when a fragment is first attached to its activity. 1029 * {@link #onCreate(Bundle)} will be called after this. 1030 */ 1031 public void onAttach(Activity activity) { 1032 mCalled = true; 1033 } 1034 1035 /** 1036 * Called when a fragment loads an animation. 1037 */ 1038 public Animator onCreateAnimator(int transit, boolean enter, int nextAnim) { 1039 return null; 1040 } 1041 1042 /** 1043 * Called to do initial creation of a fragment. This is called after 1044 * {@link #onAttach(Activity)} and before 1045 * {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}. 1046 * 1047 * <p>Note that this can be called while the fragment's activity is 1048 * still in the process of being created. As such, you can not rely 1049 * on things like the activity's content view hierarchy being initialized 1050 * at this point. If you want to do work once the activity itself is 1051 * created, see {@link #onActivityCreated(Bundle)}. 1052 * 1053 * @param savedInstanceState If the fragment is being re-created from 1054 * a previous saved state, this is the state. 1055 */ 1056 public void onCreate(Bundle savedInstanceState) { 1057 mCalled = true; 1058 } 1059 1060 /** 1061 * Called immediately after {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)} 1062 * has returned, but before any saved state has been restored in to the view. 1063 * This gives subclasses a chance to initialize themselves once 1064 * they know their view hierarchy has been completely created. The fragment's 1065 * view hierarchy is not however attached to its parent at this point. 1066 * @param view The View returned by {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}. 1067 * @param savedInstanceState If non-null, this fragment is being re-constructed 1068 * from a previous saved state as given here. 1069 */ 1070 public void onViewCreated(View view, Bundle savedInstanceState) { 1071 } 1072 1073 /** 1074 * Called to have the fragment instantiate its user interface view. 1075 * This is optional, and non-graphical fragments can return null (which 1076 * is the default implementation). This will be called between 1077 * {@link #onCreate(Bundle)} and {@link #onActivityCreated(Bundle)}. 1078 * 1079 * <p>If you return a View from here, you will later be called in 1080 * {@link #onDestroyView} when the view is being released. 1081 * 1082 * @param inflater The LayoutInflater object that can be used to inflate 1083 * any views in the fragment, 1084 * @param container If non-null, this is the parent view that the fragment's 1085 * UI should be attached to. The fragment should not add the view itself, 1086 * but this can be used to generate the LayoutParams of the view. 1087 * @param savedInstanceState If non-null, this fragment is being re-constructed 1088 * from a previous saved state as given here. 1089 * 1090 * @return Return the View for the fragment's UI, or null. 1091 */ 1092 public View onCreateView(LayoutInflater inflater, ViewGroup container, 1093 Bundle savedInstanceState) { 1094 return null; 1095 } 1096 1097 /** 1098 * Get the root view for the fragment's layout (the one returned by {@link #onCreateView}), 1099 * if provided. 1100 * 1101 * @return The fragment's root view, or null if it has no layout. 1102 */ 1103 public View getView() { 1104 return mView; 1105 } 1106 1107 /** 1108 * Called when the fragment's activity has been created and this 1109 * fragment's view hierarchy instantiated. It can be used to do final 1110 * initialization once these pieces are in place, such as retrieving 1111 * views or restoring state. It is also useful for fragments that use 1112 * {@link #setRetainInstance(boolean)} to retain their instance, 1113 * as this callback tells the fragment when it is fully associated with 1114 * the new activity instance. This is called after {@link #onCreateView} 1115 * and before {@link #onStart()}. 1116 * 1117 * @param savedInstanceState If the fragment is being re-created from 1118 * a previous saved state, this is the state. 1119 */ 1120 public void onActivityCreated(Bundle savedInstanceState) { 1121 mCalled = true; 1122 } 1123 1124 /** 1125 * Called when the Fragment is visible to the user. This is generally 1126 * tied to {@link Activity#onStart() Activity.onStart} of the containing 1127 * Activity's lifecycle. 1128 */ 1129 public void onStart() { 1130 mCalled = true; 1131 1132 if (!mLoadersStarted) { 1133 mLoadersStarted = true; 1134 if (!mCheckedForLoaderManager) { 1135 mCheckedForLoaderManager = true; 1136 mLoaderManager = mActivity.getLoaderManager(mIndex, mLoadersStarted, false); 1137 } 1138 if (mLoaderManager != null) { 1139 mLoaderManager.doStart(); 1140 } 1141 } 1142 } 1143 1144 /** 1145 * Called when the fragment is visible to the user and actively running. 1146 * This is generally 1147 * tied to {@link Activity#onResume() Activity.onResume} of the containing 1148 * Activity's lifecycle. 1149 */ 1150 public void onResume() { 1151 mCalled = true; 1152 } 1153 1154 /** 1155 * Called to ask the fragment to save its current dynamic state, so it 1156 * can later be reconstructed in a new instance of its process is 1157 * restarted. If a new instance of the fragment later needs to be 1158 * created, the data you place in the Bundle here will be available 1159 * in the Bundle given to {@link #onCreate(Bundle)}, 1160 * {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}, and 1161 * {@link #onActivityCreated(Bundle)}. 1162 * 1163 * <p>This corresponds to {@link Activity#onSaveInstanceState(Bundle) 1164 * Activity.onSaveInstanceState(Bundle)} and most of the discussion there 1165 * applies here as well. Note however: <em>this method may be called 1166 * at any time before {@link #onDestroy()}</em>. There are many situations 1167 * where a fragment may be mostly torn down (such as when placed on the 1168 * back stack with no UI showing), but its state will not be saved until 1169 * its owning activity actually needs to save its state. 1170 * 1171 * @param outState Bundle in which to place your saved state. 1172 */ 1173 public void onSaveInstanceState(Bundle outState) { 1174 } 1175 1176 public void onConfigurationChanged(Configuration newConfig) { 1177 mCalled = true; 1178 } 1179 1180 /** 1181 * Called when the Fragment is no longer resumed. This is generally 1182 * tied to {@link Activity#onPause() Activity.onPause} of the containing 1183 * Activity's lifecycle. 1184 */ 1185 public void onPause() { 1186 mCalled = true; 1187 } 1188 1189 /** 1190 * Called when the Fragment is no longer started. This is generally 1191 * tied to {@link Activity#onStop() Activity.onStop} of the containing 1192 * Activity's lifecycle. 1193 */ 1194 public void onStop() { 1195 mCalled = true; 1196 } 1197 1198 public void onLowMemory() { 1199 mCalled = true; 1200 } 1201 1202 public void onTrimMemory(int level) { 1203 mCalled = true; 1204 } 1205 1206 /** 1207 * Called when the view previously created by {@link #onCreateView} has 1208 * been detached from the fragment. The next time the fragment needs 1209 * to be displayed, a new view will be created. This is called 1210 * after {@link #onStop()} and before {@link #onDestroy()}. It is called 1211 * <em>regardless</em> of whether {@link #onCreateView} returned a 1212 * non-null view. Internally it is called after the view's state has 1213 * been saved but before it has been removed from its parent. 1214 */ 1215 public void onDestroyView() { 1216 mCalled = true; 1217 } 1218 1219 /** 1220 * Called when the fragment is no longer in use. This is called 1221 * after {@link #onStop()} and before {@link #onDetach()}. 1222 */ 1223 public void onDestroy() { 1224 mCalled = true; 1225 //Log.v("foo", "onDestroy: mCheckedForLoaderManager=" + mCheckedForLoaderManager 1226 // + " mLoaderManager=" + mLoaderManager); 1227 if (!mCheckedForLoaderManager) { 1228 mCheckedForLoaderManager = true; 1229 mLoaderManager = mActivity.getLoaderManager(mIndex, mLoadersStarted, false); 1230 } 1231 if (mLoaderManager != null) { 1232 mLoaderManager.doDestroy(); 1233 } 1234 } 1235 1236 /** 1237 * Called by the fragment manager once this fragment has been removed, 1238 * so that we don't have any left-over state if the application decides 1239 * to re-use the instance. This only clears state that the framework 1240 * internally manages, not things the application sets. 1241 */ 1242 void initState() { 1243 mIndex = -1; 1244 mWho = null; 1245 mAdded = false; 1246 mRemoving = false; 1247 mResumed = false; 1248 mFromLayout = false; 1249 mInLayout = false; 1250 mRestored = false; 1251 mBackStackNesting = 0; 1252 mFragmentManager = null; 1253 mActivity = null; 1254 mFragmentId = 0; 1255 mContainerId = 0; 1256 mTag = null; 1257 mHidden = false; 1258 mDetached = false; 1259 mRetaining = false; 1260 mLoaderManager = null; 1261 mLoadersStarted = false; 1262 mCheckedForLoaderManager = false; 1263 } 1264 1265 /** 1266 * Called when the fragment is no longer attached to its activity. This 1267 * is called after {@link #onDestroy()}. 1268 */ 1269 public void onDetach() { 1270 mCalled = true; 1271 } 1272 1273 /** 1274 * Initialize the contents of the Activity's standard options menu. You 1275 * should place your menu items in to <var>menu</var>. For this method 1276 * to be called, you must have first called {@link #setHasOptionsMenu}. See 1277 * {@link Activity#onCreateOptionsMenu(Menu) Activity.onCreateOptionsMenu} 1278 * for more information. 1279 * 1280 * @param menu The options menu in which you place your items. 1281 * 1282 * @see #setHasOptionsMenu 1283 * @see #onPrepareOptionsMenu 1284 * @see #onOptionsItemSelected 1285 */ 1286 public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 1287 } 1288 1289 /** 1290 * Prepare the Screen's standard options menu to be displayed. This is 1291 * called right before the menu is shown, every time it is shown. You can 1292 * use this method to efficiently enable/disable items or otherwise 1293 * dynamically modify the contents. See 1294 * {@link Activity#onPrepareOptionsMenu(Menu) Activity.onPrepareOptionsMenu} 1295 * for more information. 1296 * 1297 * @param menu The options menu as last shown or first initialized by 1298 * onCreateOptionsMenu(). 1299 * 1300 * @see #setHasOptionsMenu 1301 * @see #onCreateOptionsMenu 1302 */ 1303 public void onPrepareOptionsMenu(Menu menu) { 1304 } 1305 1306 /** 1307 * Called when this fragment's option menu items are no longer being 1308 * included in the overall options menu. Receiving this call means that 1309 * the menu needed to be rebuilt, but this fragment's items were not 1310 * included in the newly built menu (its {@link #onCreateOptionsMenu(Menu, MenuInflater)} 1311 * was not called). 1312 */ 1313 public void onDestroyOptionsMenu() { 1314 } 1315 1316 /** 1317 * This hook is called whenever an item in your options menu is selected. 1318 * The default implementation simply returns false to have the normal 1319 * processing happen (calling the item's Runnable or sending a message to 1320 * its Handler as appropriate). You can use this method for any items 1321 * for which you would like to do processing without those other 1322 * facilities. 1323 * 1324 * <p>Derived classes should call through to the base class for it to 1325 * perform the default menu handling. 1326 * 1327 * @param item The menu item that was selected. 1328 * 1329 * @return boolean Return false to allow normal menu processing to 1330 * proceed, true to consume it here. 1331 * 1332 * @see #onCreateOptionsMenu 1333 */ 1334 public boolean onOptionsItemSelected(MenuItem item) { 1335 return false; 1336 } 1337 1338 /** 1339 * This hook is called whenever the options menu is being closed (either by the user canceling 1340 * the menu with the back/menu button, or when an item is selected). 1341 * 1342 * @param menu The options menu as last shown or first initialized by 1343 * onCreateOptionsMenu(). 1344 */ 1345 public void onOptionsMenuClosed(Menu menu) { 1346 } 1347 1348 /** 1349 * Called when a context menu for the {@code view} is about to be shown. 1350 * Unlike {@link #onCreateOptionsMenu}, this will be called every 1351 * time the context menu is about to be shown and should be populated for 1352 * the view (or item inside the view for {@link AdapterView} subclasses, 1353 * this can be found in the {@code menuInfo})). 1354 * <p> 1355 * Use {@link #onContextItemSelected(android.view.MenuItem)} to know when an 1356 * item has been selected. 1357 * <p> 1358 * The default implementation calls up to 1359 * {@link Activity#onCreateContextMenu Activity.onCreateContextMenu}, though 1360 * you can not call this implementation if you don't want that behavior. 1361 * <p> 1362 * It is not safe to hold onto the context menu after this method returns. 1363 * {@inheritDoc} 1364 */ 1365 public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { 1366 getActivity().onCreateContextMenu(menu, v, menuInfo); 1367 } 1368 1369 /** 1370 * Registers a context menu to be shown for the given view (multiple views 1371 * can show the context menu). This method will set the 1372 * {@link OnCreateContextMenuListener} on the view to this fragment, so 1373 * {@link #onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} will be 1374 * called when it is time to show the context menu. 1375 * 1376 * @see #unregisterForContextMenu(View) 1377 * @param view The view that should show a context menu. 1378 */ 1379 public void registerForContextMenu(View view) { 1380 view.setOnCreateContextMenuListener(this); 1381 } 1382 1383 /** 1384 * Prevents a context menu to be shown for the given view. This method will 1385 * remove the {@link OnCreateContextMenuListener} on the view. 1386 * 1387 * @see #registerForContextMenu(View) 1388 * @param view The view that should stop showing a context menu. 1389 */ 1390 public void unregisterForContextMenu(View view) { 1391 view.setOnCreateContextMenuListener(null); 1392 } 1393 1394 /** 1395 * This hook is called whenever an item in a context menu is selected. The 1396 * default implementation simply returns false to have the normal processing 1397 * happen (calling the item's Runnable or sending a message to its Handler 1398 * as appropriate). You can use this method for any items for which you 1399 * would like to do processing without those other facilities. 1400 * <p> 1401 * Use {@link MenuItem#getMenuInfo()} to get extra information set by the 1402 * View that added this menu item. 1403 * <p> 1404 * Derived classes should call through to the base class for it to perform 1405 * the default menu handling. 1406 * 1407 * @param item The context menu item that was selected. 1408 * @return boolean Return false to allow normal context menu processing to 1409 * proceed, true to consume it here. 1410 */ 1411 public boolean onContextItemSelected(MenuItem item) { 1412 return false; 1413 } 1414 1415 /** 1416 * Print the Fragments's state into the given stream. 1417 * 1418 * @param prefix Text to print at the front of each line. 1419 * @param fd The raw file descriptor that the dump is being sent to. 1420 * @param writer The PrintWriter to which you should dump your state. This will be 1421 * closed for you after you return. 1422 * @param args additional arguments to the dump request. 1423 */ 1424 public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) { 1425 writer.print(prefix); writer.print("mFragmentId=#"); 1426 writer.print(Integer.toHexString(mFragmentId)); 1427 writer.print(" mContainerId#="); 1428 writer.print(Integer.toHexString(mContainerId)); 1429 writer.print(" mTag="); writer.println(mTag); 1430 writer.print(prefix); writer.print("mState="); writer.print(mState); 1431 writer.print(" mIndex="); writer.print(mIndex); 1432 writer.print(" mWho="); writer.print(mWho); 1433 writer.print(" mBackStackNesting="); writer.println(mBackStackNesting); 1434 writer.print(prefix); writer.print("mAdded="); writer.print(mAdded); 1435 writer.print(" mRemoving="); writer.print(mRemoving); 1436 writer.print(" mResumed="); writer.print(mResumed); 1437 writer.print(" mFromLayout="); writer.print(mFromLayout); 1438 writer.print(" mInLayout="); writer.println(mInLayout); 1439 writer.print(prefix); writer.print("mHidden="); writer.print(mHidden); 1440 writer.print(" mDetached="); writer.print(mDetached); 1441 writer.print(" mMenuVisible="); writer.print(mMenuVisible); 1442 writer.print(" mHasMenu="); writer.println(mHasMenu); 1443 writer.print(prefix); writer.print("mRetainInstance="); writer.print(mRetainInstance); 1444 writer.print(" mRetaining="); writer.println(mRetaining); 1445 if (mFragmentManager != null) { 1446 writer.print(prefix); writer.print("mFragmentManager="); 1447 writer.println(mFragmentManager); 1448 } 1449 if (mActivity != null) { 1450 writer.print(prefix); writer.print("mActivity="); 1451 writer.println(mActivity); 1452 } 1453 if (mArguments != null) { 1454 writer.print(prefix); writer.print("mArguments="); writer.println(mArguments); 1455 } 1456 if (mSavedFragmentState != null) { 1457 writer.print(prefix); writer.print("mSavedFragmentState="); 1458 writer.println(mSavedFragmentState); 1459 } 1460 if (mSavedViewState != null) { 1461 writer.print(prefix); writer.print("mSavedViewState="); 1462 writer.println(mSavedViewState); 1463 } 1464 if (mTarget != null) { 1465 writer.print(prefix); writer.print("mTarget="); writer.print(mTarget); 1466 writer.print(" mTargetRequestCode="); 1467 writer.println(mTargetRequestCode); 1468 } 1469 if (mNextAnim != 0) { 1470 writer.print(prefix); writer.print("mNextAnim="); writer.println(mNextAnim); 1471 } 1472 if (mContainer != null) { 1473 writer.print(prefix); writer.print("mContainer="); writer.println(mContainer); 1474 } 1475 if (mView != null) { 1476 writer.print(prefix); writer.print("mView="); writer.println(mView); 1477 } 1478 if (mAnimatingAway != null) { 1479 writer.print(prefix); writer.print("mAnimatingAway="); writer.println(mAnimatingAway); 1480 writer.print(prefix); writer.print("mStateAfterAnimating="); 1481 writer.println(mStateAfterAnimating); 1482 } 1483 if (mLoaderManager != null) { 1484 writer.print(prefix); writer.println("Loader Manager:"); 1485 mLoaderManager.dump(prefix + " ", fd, writer, args); 1486 } 1487 } 1488 1489 void performStart() { 1490 onStart(); 1491 if (mLoaderManager != null) { 1492 mLoaderManager.doReportStart(); 1493 } 1494 } 1495 1496 void performStop() { 1497 onStop(); 1498 1499 if (mLoadersStarted) { 1500 mLoadersStarted = false; 1501 if (!mCheckedForLoaderManager) { 1502 mCheckedForLoaderManager = true; 1503 mLoaderManager = mActivity.getLoaderManager(mIndex, mLoadersStarted, false); 1504 } 1505 if (mLoaderManager != null) { 1506 if (mActivity == null || !mActivity.mChangingConfigurations) { 1507 mLoaderManager.doStop(); 1508 } else { 1509 mLoaderManager.doRetain(); 1510 } 1511 } 1512 } 1513 } 1514 1515 void performDestroyView() { 1516 onDestroyView(); 1517 if (mLoaderManager != null) { 1518 mLoaderManager.doReportNextStart(); 1519 } 1520 } 1521} 1522