Fragment.java revision 2a129789adbfa64098cba50a27f88d9602d022ab
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.annotation.Nullable; 21import android.content.ComponentCallbacks2; 22import android.content.Context; 23import android.content.Intent; 24import android.content.res.Configuration; 25import android.content.res.Resources; 26import android.content.res.TypedArray; 27import android.os.Build; 28import android.os.Bundle; 29import android.os.Parcel; 30import android.os.Parcelable; 31import android.transition.Transition; 32import android.transition.TransitionInflater; 33import android.transition.TransitionSet; 34import android.util.AndroidRuntimeException; 35import android.util.ArrayMap; 36import android.util.AttributeSet; 37import android.util.DebugUtils; 38import android.util.Log; 39import android.util.SparseArray; 40import android.util.SuperNotCalledException; 41import android.view.ContextMenu; 42import android.view.ContextMenu.ContextMenuInfo; 43import android.view.LayoutInflater; 44import android.view.Menu; 45import android.view.MenuInflater; 46import android.view.MenuItem; 47import android.view.View; 48import android.view.View.OnCreateContextMenuListener; 49import android.view.ViewGroup; 50import android.widget.AdapterView; 51 52import java.io.FileDescriptor; 53import java.io.PrintWriter; 54 55final class FragmentState implements Parcelable { 56 final String mClassName; 57 final int mIndex; 58 final boolean mFromLayout; 59 final int mFragmentId; 60 final int mContainerId; 61 final String mTag; 62 final boolean mRetainInstance; 63 final boolean mDetached; 64 final Bundle mArguments; 65 66 Bundle mSavedFragmentState; 67 68 Fragment mInstance; 69 70 public FragmentState(Fragment frag) { 71 mClassName = frag.getClass().getName(); 72 mIndex = frag.mIndex; 73 mFromLayout = frag.mFromLayout; 74 mFragmentId = frag.mFragmentId; 75 mContainerId = frag.mContainerId; 76 mTag = frag.mTag; 77 mRetainInstance = frag.mRetainInstance; 78 mDetached = frag.mDetached; 79 mArguments = frag.mArguments; 80 } 81 82 public FragmentState(Parcel in) { 83 mClassName = in.readString(); 84 mIndex = in.readInt(); 85 mFromLayout = in.readInt() != 0; 86 mFragmentId = in.readInt(); 87 mContainerId = in.readInt(); 88 mTag = in.readString(); 89 mRetainInstance = in.readInt() != 0; 90 mDetached = in.readInt() != 0; 91 mArguments = in.readBundle(); 92 mSavedFragmentState = in.readBundle(); 93 } 94 95 public Fragment instantiate(Activity activity, Fragment parent) { 96 if (mInstance != null) { 97 return mInstance; 98 } 99 100 if (mArguments != null) { 101 mArguments.setClassLoader(activity.getClassLoader()); 102 } 103 104 mInstance = Fragment.instantiate(activity, mClassName, mArguments); 105 106 if (mSavedFragmentState != null) { 107 mSavedFragmentState.setClassLoader(activity.getClassLoader()); 108 mInstance.mSavedFragmentState = mSavedFragmentState; 109 } 110 mInstance.setIndex(mIndex, parent); 111 mInstance.mFromLayout = mFromLayout; 112 mInstance.mRestored = true; 113 mInstance.mFragmentId = mFragmentId; 114 mInstance.mContainerId = mContainerId; 115 mInstance.mTag = mTag; 116 mInstance.mRetainInstance = mRetainInstance; 117 mInstance.mDetached = mDetached; 118 mInstance.mFragmentManager = activity.mFragments; 119 if (FragmentManagerImpl.DEBUG) Log.v(FragmentManagerImpl.TAG, 120 "Instantiated fragment " + mInstance); 121 122 return mInstance; 123 } 124 125 public int describeContents() { 126 return 0; 127 } 128 129 public void writeToParcel(Parcel dest, int flags) { 130 dest.writeString(mClassName); 131 dest.writeInt(mIndex); 132 dest.writeInt(mFromLayout ? 1 : 0); 133 dest.writeInt(mFragmentId); 134 dest.writeInt(mContainerId); 135 dest.writeString(mTag); 136 dest.writeInt(mRetainInstance ? 1 : 0); 137 dest.writeInt(mDetached ? 1 : 0); 138 dest.writeBundle(mArguments); 139 dest.writeBundle(mSavedFragmentState); 140 } 141 142 public static final Parcelable.Creator<FragmentState> CREATOR 143 = new Parcelable.Creator<FragmentState>() { 144 public FragmentState createFromParcel(Parcel in) { 145 return new FragmentState(in); 146 } 147 148 public FragmentState[] newArray(int size) { 149 return new FragmentState[size]; 150 } 151 }; 152} 153 154/** 155 * A Fragment is a piece of an application's user interface or behavior 156 * that can be placed in an {@link Activity}. Interaction with fragments 157 * is done through {@link FragmentManager}, which can be obtained via 158 * {@link Activity#getFragmentManager() Activity.getFragmentManager()} and 159 * {@link Fragment#getFragmentManager() Fragment.getFragmentManager()}. 160 * 161 * <p>The Fragment class can be used many ways to achieve a wide variety of 162 * results. In its core, it represents a particular operation or interface 163 * that is running within a larger {@link Activity}. A Fragment is closely 164 * tied to the Activity it is in, and can not be used apart from one. Though 165 * Fragment defines its own lifecycle, that lifecycle is dependent on its 166 * activity: if the activity is stopped, no fragments inside of it can be 167 * started; when the activity is destroyed, all fragments will be destroyed. 168 * 169 * <p>All subclasses of Fragment must include a public no-argument constructor. 170 * The framework will often re-instantiate a fragment class when needed, 171 * in particular during state restore, and needs to be able to find this 172 * constructor to instantiate it. If the no-argument constructor is not 173 * available, a runtime exception will occur in some cases during state 174 * restore. 175 * 176 * <p>Topics covered here: 177 * <ol> 178 * <li><a href="#OlderPlatforms">Older Platforms</a> 179 * <li><a href="#Lifecycle">Lifecycle</a> 180 * <li><a href="#Layout">Layout</a> 181 * <li><a href="#BackStack">Back Stack</a> 182 * </ol> 183 * 184 * <div class="special reference"> 185 * <h3>Developer Guides</h3> 186 * <p>For more information about using fragments, read the 187 * <a href="{@docRoot}guide/topics/fundamentals/fragments.html">Fragments</a> developer guide.</p> 188 * </div> 189 * 190 * <a name="OlderPlatforms"></a> 191 * <h3>Older Platforms</h3> 192 * 193 * While the Fragment API was introduced in 194 * {@link android.os.Build.VERSION_CODES#HONEYCOMB}, a version of the API 195 * at is also available for use on older platforms through 196 * {@link android.support.v4.app.FragmentActivity}. See the blog post 197 * <a href="http://android-developers.blogspot.com/2011/03/fragments-for-all.html"> 198 * Fragments For All</a> for more details. 199 * 200 * <a name="Lifecycle"></a> 201 * <h3>Lifecycle</h3> 202 * 203 * <p>Though a Fragment's lifecycle is tied to its owning activity, it has 204 * its own wrinkle on the standard activity lifecycle. It includes basic 205 * activity lifecycle methods such as {@link #onResume}, but also important 206 * are methods related to interactions with the activity and UI generation. 207 * 208 * <p>The core series of lifecycle methods that are called to bring a fragment 209 * up to resumed state (interacting with the user) are: 210 * 211 * <ol> 212 * <li> {@link #onAttach} called once the fragment is associated with its activity. 213 * <li> {@link #onCreate} called to do initial creation of the fragment. 214 * <li> {@link #onCreateView} creates and returns the view hierarchy associated 215 * with the fragment. 216 * <li> {@link #onActivityCreated} tells the fragment that its activity has 217 * completed its own {@link Activity#onCreate Activity.onCreate()}. 218 * <li> {@link #onViewStateRestored} tells the fragment that all of the saved 219 * state of its view hierarchy has been restored. 220 * <li> {@link #onStart} makes the fragment visible to the user (based on its 221 * containing activity being started). 222 * <li> {@link #onResume} makes the fragment interacting with the user (based on its 223 * containing activity being resumed). 224 * </ol> 225 * 226 * <p>As a fragment is no longer being used, it goes through a reverse 227 * series of callbacks: 228 * 229 * <ol> 230 * <li> {@link #onPause} fragment is no longer interacting with the user either 231 * because its activity is being paused or a fragment operation is modifying it 232 * in the activity. 233 * <li> {@link #onStop} fragment is no longer visible to the user either 234 * because its activity is being stopped or a fragment operation is modifying it 235 * in the activity. 236 * <li> {@link #onDestroyView} allows the fragment to clean up resources 237 * associated with its View. 238 * <li> {@link #onDestroy} called to do final cleanup of the fragment's state. 239 * <li> {@link #onDetach} called immediately prior to the fragment no longer 240 * being associated with its activity. 241 * </ol> 242 * 243 * <a name="Layout"></a> 244 * <h3>Layout</h3> 245 * 246 * <p>Fragments can be used as part of your application's layout, allowing 247 * you to better modularize your code and more easily adjust your user 248 * interface to the screen it is running on. As an example, we can look 249 * at a simple program consisting of a list of items, and display of the 250 * details of each item.</p> 251 * 252 * <p>An activity's layout XML can include <code><fragment></code> tags 253 * to embed fragment instances inside of the layout. For example, here is 254 * a simple layout that embeds one fragment:</p> 255 * 256 * {@sample development/samples/ApiDemos/res/layout/fragment_layout.xml layout} 257 * 258 * <p>The layout is installed in the activity in the normal way:</p> 259 * 260 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 261 * main} 262 * 263 * <p>The titles fragment, showing a list of titles, is fairly simple, relying 264 * on {@link ListFragment} for most of its work. Note the implementation of 265 * clicking an item: depending on the current activity's layout, it can either 266 * create and display a new fragment to show the details in-place (more about 267 * this later), or start a new activity to show the details.</p> 268 * 269 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 270 * titles} 271 * 272 * <p>The details fragment showing the contents of a selected item just 273 * displays a string of text based on an index of a string array built in to 274 * the app:</p> 275 * 276 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 277 * details} 278 * 279 * <p>In this case when the user clicks on a title, there is no details 280 * container in the current activity, so the titles fragment's click code will 281 * launch a new activity to display the details fragment:</p> 282 * 283 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 284 * details_activity} 285 * 286 * <p>However the screen may be large enough to show both the list of titles 287 * and details about the currently selected title. To use such a layout on 288 * a landscape screen, this alternative layout can be placed under layout-land:</p> 289 * 290 * {@sample development/samples/ApiDemos/res/layout-land/fragment_layout.xml layout} 291 * 292 * <p>Note how the prior code will adjust to this alternative UI flow: the titles 293 * fragment will now embed the details fragment inside of this activity, and the 294 * details activity will finish itself if it is running in a configuration 295 * where the details can be shown in-place. 296 * 297 * <p>When a configuration change causes the activity hosting these fragments 298 * to restart, its new instance may use a different layout that doesn't 299 * include the same fragments as the previous layout. In this case all of 300 * the previous fragments will still be instantiated and running in the new 301 * instance. However, any that are no longer associated with a <fragment> 302 * tag in the view hierarchy will not have their content view created 303 * and will return false from {@link #isInLayout}. (The code here also shows 304 * how you can determine if a fragment placed in a container is no longer 305 * running in a layout with that container and avoid creating its view hierarchy 306 * in that case.) 307 * 308 * <p>The attributes of the <fragment> tag are used to control the 309 * LayoutParams provided when attaching the fragment's view to the parent 310 * container. They can also be parsed by the fragment in {@link #onInflate} 311 * as parameters. 312 * 313 * <p>The fragment being instantiated must have some kind of unique identifier 314 * so that it can be re-associated with a previous instance if the parent 315 * activity needs to be destroyed and recreated. This can be provided these 316 * ways: 317 * 318 * <ul> 319 * <li>If nothing is explicitly supplied, the view ID of the container will 320 * be used. 321 * <li><code>android:tag</code> can be used in <fragment> to provide 322 * a specific tag name for the fragment. 323 * <li><code>android:id</code> can be used in <fragment> to provide 324 * a specific identifier for the fragment. 325 * </ul> 326 * 327 * <a name="BackStack"></a> 328 * <h3>Back Stack</h3> 329 * 330 * <p>The transaction in which fragments are modified can be placed on an 331 * internal back-stack of the owning activity. When the user presses back 332 * in the activity, any transactions on the back stack are popped off before 333 * the activity itself is finished. 334 * 335 * <p>For example, consider this simple fragment that is instantiated with 336 * an integer argument and displays that in a TextView in its UI:</p> 337 * 338 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentStack.java 339 * fragment} 340 * 341 * <p>A function that creates a new instance of the fragment, replacing 342 * whatever current fragment instance is being shown and pushing that change 343 * on to the back stack could be written as: 344 * 345 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentStack.java 346 * add_stack} 347 * 348 * <p>After each call to this function, a new entry is on the stack, and 349 * pressing back will pop it to return the user to whatever previous state 350 * the activity UI was in. 351 */ 352public class Fragment implements ComponentCallbacks2, OnCreateContextMenuListener { 353 private static final ArrayMap<String, Class<?>> sClassMap = 354 new ArrayMap<String, Class<?>>(); 355 356 static final int INVALID_STATE = -1; // Invalid state used as a null value. 357 static final int INITIALIZING = 0; // Not yet created. 358 static final int CREATED = 1; // Created. 359 static final int ACTIVITY_CREATED = 2; // The activity has finished its creation. 360 static final int STOPPED = 3; // Fully created, not started. 361 static final int STARTED = 4; // Created and started, not resumed. 362 static final int RESUMED = 5; // Created started and resumed. 363 364 private static final Transition USE_DEFAULT_TRANSITION = new TransitionSet(); 365 366 int mState = INITIALIZING; 367 368 // Non-null if the fragment's view hierarchy is currently animating away, 369 // meaning we need to wait a bit on completely destroying it. This is the 370 // animation that is running. 371 Animator mAnimatingAway; 372 373 // If mAnimatingAway != null, this is the state we should move to once the 374 // animation is done. 375 int mStateAfterAnimating; 376 377 // When instantiated from saved state, this is the saved state. 378 Bundle mSavedFragmentState; 379 SparseArray<Parcelable> mSavedViewState; 380 381 // Index into active fragment array. 382 int mIndex = -1; 383 384 // Internal unique name for this fragment; 385 String mWho; 386 387 // Construction arguments; 388 Bundle mArguments; 389 390 // Target fragment. 391 Fragment mTarget; 392 393 // For use when retaining a fragment: this is the index of the last mTarget. 394 int mTargetIndex = -1; 395 396 // Target request code. 397 int mTargetRequestCode; 398 399 // True if the fragment is in the list of added fragments. 400 boolean mAdded; 401 402 // If set this fragment is being removed from its activity. 403 boolean mRemoving; 404 405 // True if the fragment is in the resumed state. 406 boolean mResumed; 407 408 // Set to true if this fragment was instantiated from a layout file. 409 boolean mFromLayout; 410 411 // Set to true when the view has actually been inflated in its layout. 412 boolean mInLayout; 413 414 // True if this fragment has been restored from previously saved state. 415 boolean mRestored; 416 417 // Number of active back stack entries this fragment is in. 418 int mBackStackNesting; 419 420 // The fragment manager we are associated with. Set as soon as the 421 // fragment is used in a transaction; cleared after it has been removed 422 // from all transactions. 423 FragmentManagerImpl mFragmentManager; 424 425 // Activity this fragment is attached to. 426 Activity mActivity; 427 428 // Private fragment manager for child fragments inside of this one. 429 FragmentManagerImpl mChildFragmentManager; 430 431 // If this Fragment is contained in another Fragment, this is that container. 432 Fragment mParentFragment; 433 434 // The optional identifier for this fragment -- either the container ID if it 435 // was dynamically added to the view hierarchy, or the ID supplied in 436 // layout. 437 int mFragmentId; 438 439 // When a fragment is being dynamically added to the view hierarchy, this 440 // is the identifier of the parent container it is being added to. 441 int mContainerId; 442 443 // The optional named tag for this fragment -- usually used to find 444 // fragments that are not part of the layout. 445 String mTag; 446 447 // Set to true when the app has requested that this fragment be hidden 448 // from the user. 449 boolean mHidden; 450 451 // Set to true when the app has requested that this fragment be detached. 452 boolean mDetached; 453 454 // If set this fragment would like its instance retained across 455 // configuration changes. 456 boolean mRetainInstance; 457 458 // If set this fragment is being retained across the current config change. 459 boolean mRetaining; 460 461 // If set this fragment has menu items to contribute. 462 boolean mHasMenu; 463 464 // Set to true to allow the fragment's menu to be shown. 465 boolean mMenuVisible = true; 466 467 // Used to verify that subclasses call through to super class. 468 boolean mCalled; 469 470 // If app has requested a specific animation, this is the one to use. 471 int mNextAnim; 472 473 // The parent container of the fragment after dynamically added to UI. 474 ViewGroup mContainer; 475 476 // The View generated for this fragment. 477 View mView; 478 479 // Whether this fragment should defer starting until after other fragments 480 // have been started and their loaders are finished. 481 boolean mDeferStart; 482 483 // Hint provided by the app that this fragment is currently visible to the user. 484 boolean mUserVisibleHint = true; 485 486 LoaderManagerImpl mLoaderManager; 487 boolean mLoadersStarted; 488 boolean mCheckedForLoaderManager; 489 490 private Transition mEnterTransition = null; 491 private Transition mReturnTransition = USE_DEFAULT_TRANSITION; 492 private Transition mExitTransition = null; 493 private Transition mReenterTransition = USE_DEFAULT_TRANSITION; 494 private Transition mSharedElementEnterTransition = null; 495 private Transition mSharedElementReturnTransition = USE_DEFAULT_TRANSITION; 496 private Boolean mAllowReturnTransitionOverlap; 497 private Boolean mAllowEnterTransitionOverlap; 498 499 SharedElementCallback mEnterTransitionCallback = SharedElementCallback.NULL_CALLBACK; 500 SharedElementCallback mExitTransitionCallback = SharedElementCallback.NULL_CALLBACK; 501 502 /** 503 * State information that has been retrieved from a fragment instance 504 * through {@link FragmentManager#saveFragmentInstanceState(Fragment) 505 * FragmentManager.saveFragmentInstanceState}. 506 */ 507 public static class SavedState implements Parcelable { 508 final Bundle mState; 509 510 SavedState(Bundle state) { 511 mState = state; 512 } 513 514 SavedState(Parcel in, ClassLoader loader) { 515 mState = in.readBundle(); 516 if (loader != null && mState != null) { 517 mState.setClassLoader(loader); 518 } 519 } 520 521 @Override 522 public int describeContents() { 523 return 0; 524 } 525 526 @Override 527 public void writeToParcel(Parcel dest, int flags) { 528 dest.writeBundle(mState); 529 } 530 531 public static final Parcelable.ClassLoaderCreator<SavedState> CREATOR 532 = new Parcelable.ClassLoaderCreator<SavedState>() { 533 public SavedState createFromParcel(Parcel in) { 534 return new SavedState(in, null); 535 } 536 537 public SavedState createFromParcel(Parcel in, ClassLoader loader) { 538 return new SavedState(in, loader); 539 } 540 541 public SavedState[] newArray(int size) { 542 return new SavedState[size]; 543 } 544 }; 545 } 546 547 /** 548 * Thrown by {@link Fragment#instantiate(Context, String, Bundle)} when 549 * there is an instantiation failure. 550 */ 551 static public class InstantiationException extends AndroidRuntimeException { 552 public InstantiationException(String msg, Exception cause) { 553 super(msg, cause); 554 } 555 } 556 557 /** 558 * Default constructor. <strong>Every</strong> fragment must have an 559 * empty constructor, so it can be instantiated when restoring its 560 * activity's state. It is strongly recommended that subclasses do not 561 * have other constructors with parameters, since these constructors 562 * will not be called when the fragment is re-instantiated; instead, 563 * arguments can be supplied by the caller with {@link #setArguments} 564 * and later retrieved by the Fragment with {@link #getArguments}. 565 * 566 * <p>Applications should generally not implement a constructor. The 567 * first place application code an run where the fragment is ready to 568 * be used is in {@link #onAttach(Activity)}, the point where the fragment 569 * is actually associated with its activity. Some applications may also 570 * want to implement {@link #onInflate} to retrieve attributes from a 571 * layout resource, though should take care here because this happens for 572 * the fragment is attached to its activity. 573 */ 574 public Fragment() { 575 } 576 577 /** 578 * Like {@link #instantiate(Context, String, Bundle)} but with a null 579 * argument Bundle. 580 */ 581 public static Fragment instantiate(Context context, String fname) { 582 return instantiate(context, fname, null); 583 } 584 585 /** 586 * Create a new instance of a Fragment with the given class name. This is 587 * the same as calling its empty constructor. 588 * 589 * @param context The calling context being used to instantiate the fragment. 590 * This is currently just used to get its ClassLoader. 591 * @param fname The class name of the fragment to instantiate. 592 * @param args Bundle of arguments to supply to the fragment, which it 593 * can retrieve with {@link #getArguments()}. May be null. 594 * @return Returns a new fragment instance. 595 * @throws InstantiationException If there is a failure in instantiating 596 * the given fragment class. This is a runtime exception; it is not 597 * normally expected to happen. 598 */ 599 public static Fragment instantiate(Context context, String fname, @Nullable Bundle args) { 600 try { 601 Class<?> clazz = sClassMap.get(fname); 602 if (clazz == null) { 603 // Class not found in the cache, see if it's real, and try to add it 604 clazz = context.getClassLoader().loadClass(fname); 605 if (!Fragment.class.isAssignableFrom(clazz)) { 606 throw new InstantiationException("Trying to instantiate a class " + fname 607 + " that is not a Fragment", new ClassCastException()); 608 } 609 sClassMap.put(fname, clazz); 610 } 611 Fragment f = (Fragment)clazz.newInstance(); 612 if (args != null) { 613 args.setClassLoader(f.getClass().getClassLoader()); 614 f.mArguments = args; 615 } 616 return f; 617 } catch (ClassNotFoundException e) { 618 throw new InstantiationException("Unable to instantiate fragment " + fname 619 + ": make sure class name exists, is public, and has an" 620 + " empty constructor that is public", e); 621 } catch (java.lang.InstantiationException e) { 622 throw new InstantiationException("Unable to instantiate fragment " + fname 623 + ": make sure class name exists, is public, and has an" 624 + " empty constructor that is public", e); 625 } catch (IllegalAccessException e) { 626 throw new InstantiationException("Unable to instantiate fragment " + fname 627 + ": make sure class name exists, is public, and has an" 628 + " empty constructor that is public", e); 629 } 630 } 631 632 final void restoreViewState(Bundle savedInstanceState) { 633 if (mSavedViewState != null) { 634 mView.restoreHierarchyState(mSavedViewState); 635 mSavedViewState = null; 636 } 637 mCalled = false; 638 onViewStateRestored(savedInstanceState); 639 if (!mCalled) { 640 throw new SuperNotCalledException("Fragment " + this 641 + " did not call through to super.onViewStateRestored()"); 642 } 643 } 644 645 final void setIndex(int index, Fragment parent) { 646 mIndex = index; 647 if (parent != null) { 648 mWho = parent.mWho + ":" + mIndex; 649 } else { 650 mWho = "android:fragment:" + mIndex; 651 } 652 } 653 654 final boolean isInBackStack() { 655 return mBackStackNesting > 0; 656 } 657 658 /** 659 * Subclasses can not override equals(). 660 */ 661 @Override final public boolean equals(Object o) { 662 return super.equals(o); 663 } 664 665 /** 666 * Subclasses can not override hashCode(). 667 */ 668 @Override final public int hashCode() { 669 return super.hashCode(); 670 } 671 672 @Override 673 public String toString() { 674 StringBuilder sb = new StringBuilder(128); 675 DebugUtils.buildShortClassTag(this, sb); 676 if (mIndex >= 0) { 677 sb.append(" #"); 678 sb.append(mIndex); 679 } 680 if (mFragmentId != 0) { 681 sb.append(" id=0x"); 682 sb.append(Integer.toHexString(mFragmentId)); 683 } 684 if (mTag != null) { 685 sb.append(" "); 686 sb.append(mTag); 687 } 688 sb.append('}'); 689 return sb.toString(); 690 } 691 692 /** 693 * Return the identifier this fragment is known by. This is either 694 * the android:id value supplied in a layout or the container view ID 695 * supplied when adding the fragment. 696 */ 697 final public int getId() { 698 return mFragmentId; 699 } 700 701 /** 702 * Get the tag name of the fragment, if specified. 703 */ 704 final public String getTag() { 705 return mTag; 706 } 707 708 /** 709 * Supply the construction arguments for this fragment. This can only 710 * be called before the fragment has been attached to its activity; that 711 * is, you should call it immediately after constructing the fragment. The 712 * arguments supplied here will be retained across fragment destroy and 713 * creation. 714 */ 715 public void setArguments(Bundle args) { 716 if (mIndex >= 0) { 717 throw new IllegalStateException("Fragment already active"); 718 } 719 mArguments = args; 720 } 721 722 /** 723 * Return the arguments supplied when the fragment was instantiated, 724 * if any. 725 */ 726 final public Bundle getArguments() { 727 return mArguments; 728 } 729 730 /** 731 * Set the initial saved state that this Fragment should restore itself 732 * from when first being constructed, as returned by 733 * {@link FragmentManager#saveFragmentInstanceState(Fragment) 734 * FragmentManager.saveFragmentInstanceState}. 735 * 736 * @param state The state the fragment should be restored from. 737 */ 738 public void setInitialSavedState(SavedState state) { 739 if (mIndex >= 0) { 740 throw new IllegalStateException("Fragment already active"); 741 } 742 mSavedFragmentState = state != null && state.mState != null 743 ? state.mState : null; 744 } 745 746 /** 747 * Optional target for this fragment. This may be used, for example, 748 * if this fragment is being started by another, and when done wants to 749 * give a result back to the first. The target set here is retained 750 * across instances via {@link FragmentManager#putFragment 751 * FragmentManager.putFragment()}. 752 * 753 * @param fragment The fragment that is the target of this one. 754 * @param requestCode Optional request code, for convenience if you 755 * are going to call back with {@link #onActivityResult(int, int, Intent)}. 756 */ 757 public void setTargetFragment(Fragment fragment, int requestCode) { 758 mTarget = fragment; 759 mTargetRequestCode = requestCode; 760 } 761 762 /** 763 * Return the target fragment set by {@link #setTargetFragment}. 764 */ 765 final public Fragment getTargetFragment() { 766 return mTarget; 767 } 768 769 /** 770 * Return the target request code set by {@link #setTargetFragment}. 771 */ 772 final public int getTargetRequestCode() { 773 return mTargetRequestCode; 774 } 775 776 /** 777 * Return the Activity this fragment is currently associated with. 778 */ 779 final public Activity getActivity() { 780 return mActivity; 781 } 782 783 /** 784 * Return <code>getActivity().getResources()</code>. 785 */ 786 final public Resources getResources() { 787 if (mActivity == null) { 788 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 789 } 790 return mActivity.getResources(); 791 } 792 793 /** 794 * Return a localized, styled CharSequence from the application's package's 795 * default string table. 796 * 797 * @param resId Resource id for the CharSequence text 798 */ 799 public final CharSequence getText(int resId) { 800 return getResources().getText(resId); 801 } 802 803 /** 804 * Return a localized string from the application's package's 805 * default string table. 806 * 807 * @param resId Resource id for the string 808 */ 809 public final String getString(int resId) { 810 return getResources().getString(resId); 811 } 812 813 /** 814 * Return a localized formatted string from the application's package's 815 * default string table, substituting the format arguments as defined in 816 * {@link java.util.Formatter} and {@link java.lang.String#format}. 817 * 818 * @param resId Resource id for the format string 819 * @param formatArgs The format arguments that will be used for substitution. 820 */ 821 822 public final String getString(int resId, Object... formatArgs) { 823 return getResources().getString(resId, formatArgs); 824 } 825 826 /** 827 * Return the FragmentManager for interacting with fragments associated 828 * with this fragment's activity. Note that this will be non-null slightly 829 * before {@link #getActivity()}, during the time from when the fragment is 830 * placed in a {@link FragmentTransaction} until it is committed and 831 * attached to its activity. 832 * 833 * <p>If this Fragment is a child of another Fragment, the FragmentManager 834 * returned here will be the parent's {@link #getChildFragmentManager()}. 835 */ 836 final public FragmentManager getFragmentManager() { 837 return mFragmentManager; 838 } 839 840 /** 841 * Return a private FragmentManager for placing and managing Fragments 842 * inside of this Fragment. 843 */ 844 final public FragmentManager getChildFragmentManager() { 845 if (mChildFragmentManager == null) { 846 instantiateChildFragmentManager(); 847 if (mState >= RESUMED) { 848 mChildFragmentManager.dispatchResume(); 849 } else if (mState >= STARTED) { 850 mChildFragmentManager.dispatchStart(); 851 } else if (mState >= ACTIVITY_CREATED) { 852 mChildFragmentManager.dispatchActivityCreated(); 853 } else if (mState >= CREATED) { 854 mChildFragmentManager.dispatchCreate(); 855 } 856 } 857 return mChildFragmentManager; 858 } 859 860 /** 861 * Returns the parent Fragment containing this Fragment. If this Fragment 862 * is attached directly to an Activity, returns null. 863 */ 864 final public Fragment getParentFragment() { 865 return mParentFragment; 866 } 867 868 /** 869 * Return true if the fragment is currently added to its activity. 870 */ 871 final public boolean isAdded() { 872 return mActivity != null && mAdded; 873 } 874 875 /** 876 * Return true if the fragment has been explicitly detached from the UI. 877 * That is, {@link FragmentTransaction#detach(Fragment) 878 * FragmentTransaction.detach(Fragment)} has been used on it. 879 */ 880 final public boolean isDetached() { 881 return mDetached; 882 } 883 884 /** 885 * Return true if this fragment is currently being removed from its 886 * activity. This is <em>not</em> whether its activity is finishing, but 887 * rather whether it is in the process of being removed from its activity. 888 */ 889 final public boolean isRemoving() { 890 return mRemoving; 891 } 892 893 /** 894 * Return true if the layout is included as part of an activity view 895 * hierarchy via the <fragment> tag. This will always be true when 896 * fragments are created through the <fragment> tag, <em>except</em> 897 * in the case where an old fragment is restored from a previous state and 898 * it does not appear in the layout of the current state. 899 */ 900 final public boolean isInLayout() { 901 return mInLayout; 902 } 903 904 /** 905 * Return true if the fragment is in the resumed state. This is true 906 * for the duration of {@link #onResume()} and {@link #onPause()} as well. 907 */ 908 final public boolean isResumed() { 909 return mResumed; 910 } 911 912 /** 913 * Return true if the fragment is currently visible to the user. This means 914 * it: (1) has been added, (2) has its view attached to the window, and 915 * (3) is not hidden. 916 */ 917 final public boolean isVisible() { 918 return isAdded() && !isHidden() && mView != null 919 && mView.getWindowToken() != null && mView.getVisibility() == View.VISIBLE; 920 } 921 922 /** 923 * Return true if the fragment has been hidden. By default fragments 924 * are shown. You can find out about changes to this state with 925 * {@link #onHiddenChanged}. Note that the hidden state is orthogonal 926 * to other states -- that is, to be visible to the user, a fragment 927 * must be both started and not hidden. 928 */ 929 final public boolean isHidden() { 930 return mHidden; 931 } 932 933 /** 934 * Called when the hidden state (as returned by {@link #isHidden()} of 935 * the fragment has changed. Fragments start out not hidden; this will 936 * be called whenever the fragment changes state from that. 937 * @param hidden True if the fragment is now hidden, false if it is not 938 * visible. 939 */ 940 public void onHiddenChanged(boolean hidden) { 941 } 942 943 /** 944 * Control whether a fragment instance is retained across Activity 945 * re-creation (such as from a configuration change). This can only 946 * be used with fragments not in the back stack. If set, the fragment 947 * lifecycle will be slightly different when an activity is recreated: 948 * <ul> 949 * <li> {@link #onDestroy()} will not be called (but {@link #onDetach()} still 950 * will be, because the fragment is being detached from its current activity). 951 * <li> {@link #onCreate(Bundle)} will not be called since the fragment 952 * is not being re-created. 953 * <li> {@link #onAttach(Activity)} and {@link #onActivityCreated(Bundle)} <b>will</b> 954 * still be called. 955 * </ul> 956 */ 957 public void setRetainInstance(boolean retain) { 958 if (retain && mParentFragment != null) { 959 throw new IllegalStateException( 960 "Can't retain fragements that are nested in other fragments"); 961 } 962 mRetainInstance = retain; 963 } 964 965 final public boolean getRetainInstance() { 966 return mRetainInstance; 967 } 968 969 /** 970 * Report that this fragment would like to participate in populating 971 * the options menu by receiving a call to {@link #onCreateOptionsMenu} 972 * and related methods. 973 * 974 * @param hasMenu If true, the fragment has menu items to contribute. 975 */ 976 public void setHasOptionsMenu(boolean hasMenu) { 977 if (mHasMenu != hasMenu) { 978 mHasMenu = hasMenu; 979 if (isAdded() && !isHidden()) { 980 mFragmentManager.invalidateOptionsMenu(); 981 } 982 } 983 } 984 985 /** 986 * Set a hint for whether this fragment's menu should be visible. This 987 * is useful if you know that a fragment has been placed in your view 988 * hierarchy so that the user can not currently seen it, so any menu items 989 * it has should also not be shown. 990 * 991 * @param menuVisible The default is true, meaning the fragment's menu will 992 * be shown as usual. If false, the user will not see the menu. 993 */ 994 public void setMenuVisibility(boolean menuVisible) { 995 if (mMenuVisible != menuVisible) { 996 mMenuVisible = menuVisible; 997 if (mHasMenu && isAdded() && !isHidden()) { 998 mFragmentManager.invalidateOptionsMenu(); 999 } 1000 } 1001 } 1002 1003 /** 1004 * Set a hint to the system about whether this fragment's UI is currently visible 1005 * to the user. This hint defaults to true and is persistent across fragment instance 1006 * state save and restore. 1007 * 1008 * <p>An app may set this to false to indicate that the fragment's UI is 1009 * scrolled out of visibility or is otherwise not directly visible to the user. 1010 * This may be used by the system to prioritize operations such as fragment lifecycle updates 1011 * or loader ordering behavior.</p> 1012 * 1013 * @param isVisibleToUser true if this fragment's UI is currently visible to the user (default), 1014 * false if it is not. 1015 */ 1016 public void setUserVisibleHint(boolean isVisibleToUser) { 1017 if (!mUserVisibleHint && isVisibleToUser && mState < STARTED) { 1018 mFragmentManager.performPendingDeferredStart(this); 1019 } 1020 mUserVisibleHint = isVisibleToUser; 1021 mDeferStart = !isVisibleToUser; 1022 } 1023 1024 /** 1025 * @return The current value of the user-visible hint on this fragment. 1026 * @see #setUserVisibleHint(boolean) 1027 */ 1028 public boolean getUserVisibleHint() { 1029 return mUserVisibleHint; 1030 } 1031 1032 /** 1033 * Return the LoaderManager for this fragment, creating it if needed. 1034 */ 1035 public LoaderManager getLoaderManager() { 1036 if (mLoaderManager != null) { 1037 return mLoaderManager; 1038 } 1039 if (mActivity == null) { 1040 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 1041 } 1042 mCheckedForLoaderManager = true; 1043 mLoaderManager = mActivity.getLoaderManager(mWho, mLoadersStarted, true); 1044 return mLoaderManager; 1045 } 1046 1047 /** 1048 * Call {@link Activity#startActivity(Intent)} from the fragment's 1049 * containing Activity. 1050 * 1051 * @param intent The intent to start. 1052 */ 1053 public void startActivity(Intent intent) { 1054 startActivity(intent, null); 1055 } 1056 1057 /** 1058 * Call {@link Activity#startActivity(Intent, Bundle)} from the fragment's 1059 * containing Activity. 1060 * 1061 * @param intent The intent to start. 1062 * @param options Additional options for how the Activity should be started. 1063 * See {@link android.content.Context#startActivity(Intent, Bundle) 1064 * Context.startActivity(Intent, Bundle)} for more details. 1065 */ 1066 public void startActivity(Intent intent, Bundle options) { 1067 if (mActivity == null) { 1068 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 1069 } 1070 if (options != null) { 1071 mActivity.startActivityFromFragment(this, intent, -1, options); 1072 } else { 1073 // Note we want to go through this call for compatibility with 1074 // applications that may have overridden the method. 1075 mActivity.startActivityFromFragment(this, intent, -1); 1076 } 1077 } 1078 1079 /** 1080 * Call {@link Activity#startActivityForResult(Intent, int)} from the fragment's 1081 * containing Activity. 1082 */ 1083 public void startActivityForResult(Intent intent, int requestCode) { 1084 startActivityForResult(intent, requestCode, null); 1085 } 1086 1087 /** 1088 * Call {@link Activity#startActivityForResult(Intent, int, Bundle)} from the fragment's 1089 * containing Activity. 1090 */ 1091 public void startActivityForResult(Intent intent, int requestCode, Bundle options) { 1092 if (mActivity == null) { 1093 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 1094 } 1095 if (options != null) { 1096 mActivity.startActivityFromFragment(this, intent, requestCode, options); 1097 } else { 1098 // Note we want to go through this call for compatibility with 1099 // applications that may have overridden the method. 1100 mActivity.startActivityFromFragment(this, intent, requestCode, options); 1101 } 1102 } 1103 1104 /** 1105 * Receive the result from a previous call to 1106 * {@link #startActivityForResult(Intent, int)}. This follows the 1107 * related Activity API as described there in 1108 * {@link Activity#onActivityResult(int, int, Intent)}. 1109 * 1110 * @param requestCode The integer request code originally supplied to 1111 * startActivityForResult(), allowing you to identify who this 1112 * result came from. 1113 * @param resultCode The integer result code returned by the child activity 1114 * through its setResult(). 1115 * @param data An Intent, which can return result data to the caller 1116 * (various data can be attached to Intent "extras"). 1117 */ 1118 public void onActivityResult(int requestCode, int resultCode, Intent data) { 1119 } 1120 1121 /** 1122 * @hide Hack so that DialogFragment can make its Dialog before creating 1123 * its views, and the view construction can use the dialog's context for 1124 * inflation. Maybe this should become a public API. Note sure. 1125 */ 1126 public LayoutInflater getLayoutInflater(Bundle savedInstanceState) { 1127 // Newer platform versions use the child fragment manager's LayoutInflaterFactory. 1128 if (mActivity.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.L) { 1129 LayoutInflater result = mActivity.getLayoutInflater().cloneInContext(mActivity); 1130 getChildFragmentManager(); // Init if needed; use raw implementation below. 1131 result.setPrivateFactory(mChildFragmentManager.getLayoutInflaterFactory()); 1132 return result; 1133 } else { 1134 return mActivity.getLayoutInflater(); 1135 } 1136 } 1137 1138 /** 1139 * @deprecated Use {@link #onInflate(Activity, AttributeSet, Bundle)} instead. 1140 */ 1141 @Deprecated 1142 public void onInflate(AttributeSet attrs, Bundle savedInstanceState) { 1143 mCalled = true; 1144 } 1145 1146 /** 1147 * Called when a fragment is being created as part of a view layout 1148 * inflation, typically from setting the content view of an activity. This 1149 * may be called immediately after the fragment is created from a <fragment> 1150 * tag in a layout file. Note this is <em>before</em> the fragment's 1151 * {@link #onAttach(Activity)} has been called; all you should do here is 1152 * parse the attributes and save them away. 1153 * 1154 * <p>This is called every time the fragment is inflated, even if it is 1155 * being inflated into a new instance with saved state. It typically makes 1156 * sense to re-parse the parameters each time, to allow them to change with 1157 * different configurations.</p> 1158 * 1159 * <p>Here is a typical implementation of a fragment that can take parameters 1160 * both through attributes supplied here as well from {@link #getArguments()}:</p> 1161 * 1162 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentArguments.java 1163 * fragment} 1164 * 1165 * <p>Note that parsing the XML attributes uses a "styleable" resource. The 1166 * declaration for the styleable used here is:</p> 1167 * 1168 * {@sample development/samples/ApiDemos/res/values/attrs.xml fragment_arguments} 1169 * 1170 * <p>The fragment can then be declared within its activity's content layout 1171 * through a tag like this:</p> 1172 * 1173 * {@sample development/samples/ApiDemos/res/layout/fragment_arguments.xml from_attributes} 1174 * 1175 * <p>This fragment can also be created dynamically from arguments given 1176 * at runtime in the arguments Bundle; here is an example of doing so at 1177 * creation of the containing activity:</p> 1178 * 1179 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentArguments.java 1180 * create} 1181 * 1182 * @param activity The Activity that is inflating this fragment. 1183 * @param attrs The attributes at the tag where the fragment is 1184 * being created. 1185 * @param savedInstanceState If the fragment is being re-created from 1186 * a previous saved state, this is the state. 1187 */ 1188 public void onInflate(Activity activity, AttributeSet attrs, Bundle savedInstanceState) { 1189 onInflate(attrs, savedInstanceState); 1190 mCalled = true; 1191 1192 TypedArray a = activity.obtainStyledAttributes(attrs, 1193 com.android.internal.R.styleable.Fragment); 1194 mEnterTransition = loadTransition(activity, a, mEnterTransition, null, 1195 com.android.internal.R.styleable.Fragment_fragmentEnterTransition); 1196 mReturnTransition = loadTransition(activity, a, mReturnTransition, USE_DEFAULT_TRANSITION, 1197 com.android.internal.R.styleable.Fragment_fragmentReturnTransition); 1198 mExitTransition = loadTransition(activity, a, mExitTransition, null, 1199 com.android.internal.R.styleable.Fragment_fragmentExitTransition); 1200 mReenterTransition = loadTransition(activity, a, mReenterTransition, USE_DEFAULT_TRANSITION, 1201 com.android.internal.R.styleable.Fragment_fragmentReenterTransition); 1202 mSharedElementEnterTransition = loadTransition(activity, a, mSharedElementEnterTransition, 1203 null, com.android.internal.R.styleable.Fragment_fragmentSharedElementEnterTransition); 1204 mSharedElementReturnTransition = loadTransition(activity, a, mSharedElementReturnTransition, 1205 USE_DEFAULT_TRANSITION, 1206 com.android.internal.R.styleable.Fragment_fragmentSharedElementReturnTransition); 1207 if (mAllowEnterTransitionOverlap == null) { 1208 mAllowEnterTransitionOverlap = a.getBoolean( 1209 com.android.internal.R.styleable.Fragment_fragmentAllowEnterTransitionOverlap, true); 1210 } 1211 if (mAllowReturnTransitionOverlap == null) { 1212 mAllowReturnTransitionOverlap = a.getBoolean( 1213 com.android.internal.R.styleable.Fragment_fragmentAllowReturnTransitionOverlap, true); 1214 } 1215 a.recycle(); 1216 } 1217 1218 /** 1219 * Called when a fragment is first attached to its activity. 1220 * {@link #onCreate(Bundle)} will be called after this. 1221 */ 1222 public void onAttach(Activity activity) { 1223 mCalled = true; 1224 } 1225 1226 /** 1227 * Called when a fragment loads an animation. 1228 */ 1229 public Animator onCreateAnimator(int transit, boolean enter, int nextAnim) { 1230 return null; 1231 } 1232 1233 /** 1234 * Called to do initial creation of a fragment. This is called after 1235 * {@link #onAttach(Activity)} and before 1236 * {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}. 1237 * 1238 * <p>Note that this can be called while the fragment's activity is 1239 * still in the process of being created. As such, you can not rely 1240 * on things like the activity's content view hierarchy being initialized 1241 * at this point. If you want to do work once the activity itself is 1242 * created, see {@link #onActivityCreated(Bundle)}. 1243 * 1244 * @param savedInstanceState If the fragment is being re-created from 1245 * a previous saved state, this is the state. 1246 */ 1247 public void onCreate(Bundle savedInstanceState) { 1248 mCalled = true; 1249 } 1250 1251 /** 1252 * Called to have the fragment instantiate its user interface view. 1253 * This is optional, and non-graphical fragments can return null (which 1254 * is the default implementation). This will be called between 1255 * {@link #onCreate(Bundle)} and {@link #onActivityCreated(Bundle)}. 1256 * 1257 * <p>If you return a View from here, you will later be called in 1258 * {@link #onDestroyView} when the view is being released. 1259 * 1260 * @param inflater The LayoutInflater object that can be used to inflate 1261 * any views in the fragment, 1262 * @param container If non-null, this is the parent view that the fragment's 1263 * UI should be attached to. The fragment should not add the view itself, 1264 * but this can be used to generate the LayoutParams of the view. 1265 * @param savedInstanceState If non-null, this fragment is being re-constructed 1266 * from a previous saved state as given here. 1267 * 1268 * @return Return the View for the fragment's UI, or null. 1269 */ 1270 @Nullable 1271 public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, 1272 Bundle savedInstanceState) { 1273 return null; 1274 } 1275 1276 /** 1277 * Called immediately after {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)} 1278 * has returned, but before any saved state has been restored in to the view. 1279 * This gives subclasses a chance to initialize themselves once 1280 * they know their view hierarchy has been completely created. The fragment's 1281 * view hierarchy is not however attached to its parent at this point. 1282 * @param view The View returned by {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}. 1283 * @param savedInstanceState If non-null, this fragment is being re-constructed 1284 * from a previous saved state as given here. 1285 */ 1286 public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { 1287 } 1288 1289 /** 1290 * Get the root view for the fragment's layout (the one returned by {@link #onCreateView}), 1291 * if provided. 1292 * 1293 * @return The fragment's root view, or null if it has no layout. 1294 */ 1295 @Nullable 1296 public View getView() { 1297 return mView; 1298 } 1299 1300 /** 1301 * Called when the fragment's activity has been created and this 1302 * fragment's view hierarchy instantiated. It can be used to do final 1303 * initialization once these pieces are in place, such as retrieving 1304 * views or restoring state. It is also useful for fragments that use 1305 * {@link #setRetainInstance(boolean)} to retain their instance, 1306 * as this callback tells the fragment when it is fully associated with 1307 * the new activity instance. This is called after {@link #onCreateView} 1308 * and before {@link #onViewStateRestored(Bundle)}. 1309 * 1310 * @param savedInstanceState If the fragment is being re-created from 1311 * a previous saved state, this is the state. 1312 */ 1313 public void onActivityCreated(Bundle savedInstanceState) { 1314 mCalled = true; 1315 } 1316 1317 /** 1318 * Called when all saved state has been restored into the view hierarchy 1319 * of the fragment. This can be used to do initialization based on saved 1320 * state that you are letting the view hierarchy track itself, such as 1321 * whether check box widgets are currently checked. This is called 1322 * after {@link #onActivityCreated(Bundle)} and before 1323 * {@link #onStart()}. 1324 * 1325 * @param savedInstanceState If the fragment is being re-created from 1326 * a previous saved state, this is the state. 1327 */ 1328 public void onViewStateRestored(Bundle savedInstanceState) { 1329 mCalled = true; 1330 } 1331 1332 /** 1333 * Called when the Fragment is visible to the user. This is generally 1334 * tied to {@link Activity#onStart() Activity.onStart} of the containing 1335 * Activity's lifecycle. 1336 */ 1337 public void onStart() { 1338 mCalled = true; 1339 1340 if (!mLoadersStarted) { 1341 mLoadersStarted = true; 1342 if (!mCheckedForLoaderManager) { 1343 mCheckedForLoaderManager = true; 1344 mLoaderManager = mActivity.getLoaderManager(mWho, mLoadersStarted, false); 1345 } 1346 if (mLoaderManager != null) { 1347 mLoaderManager.doStart(); 1348 } 1349 } 1350 } 1351 1352 /** 1353 * Called when the fragment is visible to the user and actively running. 1354 * This is generally 1355 * tied to {@link Activity#onResume() Activity.onResume} of the containing 1356 * Activity's lifecycle. 1357 */ 1358 public void onResume() { 1359 mCalled = true; 1360 } 1361 1362 /** 1363 * Called to ask the fragment to save its current dynamic state, so it 1364 * can later be reconstructed in a new instance of its process is 1365 * restarted. If a new instance of the fragment later needs to be 1366 * created, the data you place in the Bundle here will be available 1367 * in the Bundle given to {@link #onCreate(Bundle)}, 1368 * {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}, and 1369 * {@link #onActivityCreated(Bundle)}. 1370 * 1371 * <p>This corresponds to {@link Activity#onSaveInstanceState(Bundle) 1372 * Activity.onSaveInstanceState(Bundle)} and most of the discussion there 1373 * applies here as well. Note however: <em>this method may be called 1374 * at any time before {@link #onDestroy()}</em>. There are many situations 1375 * where a fragment may be mostly torn down (such as when placed on the 1376 * back stack with no UI showing), but its state will not be saved until 1377 * its owning activity actually needs to save its state. 1378 * 1379 * @param outState Bundle in which to place your saved state. 1380 */ 1381 public void onSaveInstanceState(Bundle outState) { 1382 } 1383 1384 public void onConfigurationChanged(Configuration newConfig) { 1385 mCalled = true; 1386 } 1387 1388 /** 1389 * Called when the Fragment is no longer resumed. This is generally 1390 * tied to {@link Activity#onPause() Activity.onPause} of the containing 1391 * Activity's lifecycle. 1392 */ 1393 public void onPause() { 1394 mCalled = true; 1395 } 1396 1397 /** 1398 * Called when the Fragment is no longer started. This is generally 1399 * tied to {@link Activity#onStop() Activity.onStop} of the containing 1400 * Activity's lifecycle. 1401 */ 1402 public void onStop() { 1403 mCalled = true; 1404 } 1405 1406 public void onLowMemory() { 1407 mCalled = true; 1408 } 1409 1410 public void onTrimMemory(int level) { 1411 mCalled = true; 1412 } 1413 1414 /** 1415 * Called when the view previously created by {@link #onCreateView} has 1416 * been detached from the fragment. The next time the fragment needs 1417 * to be displayed, a new view will be created. This is called 1418 * after {@link #onStop()} and before {@link #onDestroy()}. It is called 1419 * <em>regardless</em> of whether {@link #onCreateView} returned a 1420 * non-null view. Internally it is called after the view's state has 1421 * been saved but before it has been removed from its parent. 1422 */ 1423 public void onDestroyView() { 1424 mCalled = true; 1425 } 1426 1427 /** 1428 * Called when the fragment is no longer in use. This is called 1429 * after {@link #onStop()} and before {@link #onDetach()}. 1430 */ 1431 public void onDestroy() { 1432 mCalled = true; 1433 //Log.v("foo", "onDestroy: mCheckedForLoaderManager=" + mCheckedForLoaderManager 1434 // + " mLoaderManager=" + mLoaderManager); 1435 if (!mCheckedForLoaderManager) { 1436 mCheckedForLoaderManager = true; 1437 mLoaderManager = mActivity.getLoaderManager(mWho, mLoadersStarted, false); 1438 } 1439 if (mLoaderManager != null) { 1440 mLoaderManager.doDestroy(); 1441 } 1442 } 1443 1444 /** 1445 * Called by the fragment manager once this fragment has been removed, 1446 * so that we don't have any left-over state if the application decides 1447 * to re-use the instance. This only clears state that the framework 1448 * internally manages, not things the application sets. 1449 */ 1450 void initState() { 1451 mIndex = -1; 1452 mWho = null; 1453 mAdded = false; 1454 mRemoving = false; 1455 mResumed = false; 1456 mFromLayout = false; 1457 mInLayout = false; 1458 mRestored = false; 1459 mBackStackNesting = 0; 1460 mFragmentManager = null; 1461 mChildFragmentManager = null; 1462 mActivity = null; 1463 mFragmentId = 0; 1464 mContainerId = 0; 1465 mTag = null; 1466 mHidden = false; 1467 mDetached = false; 1468 mRetaining = false; 1469 mLoaderManager = null; 1470 mLoadersStarted = false; 1471 mCheckedForLoaderManager = false; 1472 } 1473 1474 /** 1475 * Called when the fragment is no longer attached to its activity. This 1476 * is called after {@link #onDestroy()}. 1477 */ 1478 public void onDetach() { 1479 mCalled = true; 1480 } 1481 1482 /** 1483 * Initialize the contents of the Activity's standard options menu. You 1484 * should place your menu items in to <var>menu</var>. For this method 1485 * to be called, you must have first called {@link #setHasOptionsMenu}. See 1486 * {@link Activity#onCreateOptionsMenu(Menu) Activity.onCreateOptionsMenu} 1487 * for more information. 1488 * 1489 * @param menu The options menu in which you place your items. 1490 * 1491 * @see #setHasOptionsMenu 1492 * @see #onPrepareOptionsMenu 1493 * @see #onOptionsItemSelected 1494 */ 1495 public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 1496 } 1497 1498 /** 1499 * Prepare the Screen's standard options menu to be displayed. This is 1500 * called right before the menu is shown, every time it is shown. You can 1501 * use this method to efficiently enable/disable items or otherwise 1502 * dynamically modify the contents. See 1503 * {@link Activity#onPrepareOptionsMenu(Menu) Activity.onPrepareOptionsMenu} 1504 * for more information. 1505 * 1506 * @param menu The options menu as last shown or first initialized by 1507 * onCreateOptionsMenu(). 1508 * 1509 * @see #setHasOptionsMenu 1510 * @see #onCreateOptionsMenu 1511 */ 1512 public void onPrepareOptionsMenu(Menu menu) { 1513 } 1514 1515 /** 1516 * Called when this fragment's option menu items are no longer being 1517 * included in the overall options menu. Receiving this call means that 1518 * the menu needed to be rebuilt, but this fragment's items were not 1519 * included in the newly built menu (its {@link #onCreateOptionsMenu(Menu, MenuInflater)} 1520 * was not called). 1521 */ 1522 public void onDestroyOptionsMenu() { 1523 } 1524 1525 /** 1526 * This hook is called whenever an item in your options menu is selected. 1527 * The default implementation simply returns false to have the normal 1528 * processing happen (calling the item's Runnable or sending a message to 1529 * its Handler as appropriate). You can use this method for any items 1530 * for which you would like to do processing without those other 1531 * facilities. 1532 * 1533 * <p>Derived classes should call through to the base class for it to 1534 * perform the default menu handling. 1535 * 1536 * @param item The menu item that was selected. 1537 * 1538 * @return boolean Return false to allow normal menu processing to 1539 * proceed, true to consume it here. 1540 * 1541 * @see #onCreateOptionsMenu 1542 */ 1543 public boolean onOptionsItemSelected(MenuItem item) { 1544 return false; 1545 } 1546 1547 /** 1548 * This hook is called whenever the options menu is being closed (either by the user canceling 1549 * the menu with the back/menu button, or when an item is selected). 1550 * 1551 * @param menu The options menu as last shown or first initialized by 1552 * onCreateOptionsMenu(). 1553 */ 1554 public void onOptionsMenuClosed(Menu menu) { 1555 } 1556 1557 /** 1558 * Called when a context menu for the {@code view} is about to be shown. 1559 * Unlike {@link #onCreateOptionsMenu}, this will be called every 1560 * time the context menu is about to be shown and should be populated for 1561 * the view (or item inside the view for {@link AdapterView} subclasses, 1562 * this can be found in the {@code menuInfo})). 1563 * <p> 1564 * Use {@link #onContextItemSelected(android.view.MenuItem)} to know when an 1565 * item has been selected. 1566 * <p> 1567 * The default implementation calls up to 1568 * {@link Activity#onCreateContextMenu Activity.onCreateContextMenu}, though 1569 * you can not call this implementation if you don't want that behavior. 1570 * <p> 1571 * It is not safe to hold onto the context menu after this method returns. 1572 * {@inheritDoc} 1573 */ 1574 public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { 1575 getActivity().onCreateContextMenu(menu, v, menuInfo); 1576 } 1577 1578 /** 1579 * Registers a context menu to be shown for the given view (multiple views 1580 * can show the context menu). This method will set the 1581 * {@link OnCreateContextMenuListener} on the view to this fragment, so 1582 * {@link #onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} will be 1583 * called when it is time to show the context menu. 1584 * 1585 * @see #unregisterForContextMenu(View) 1586 * @param view The view that should show a context menu. 1587 */ 1588 public void registerForContextMenu(View view) { 1589 view.setOnCreateContextMenuListener(this); 1590 } 1591 1592 /** 1593 * Prevents a context menu to be shown for the given view. This method will 1594 * remove the {@link OnCreateContextMenuListener} on the view. 1595 * 1596 * @see #registerForContextMenu(View) 1597 * @param view The view that should stop showing a context menu. 1598 */ 1599 public void unregisterForContextMenu(View view) { 1600 view.setOnCreateContextMenuListener(null); 1601 } 1602 1603 /** 1604 * This hook is called whenever an item in a context menu is selected. The 1605 * default implementation simply returns false to have the normal processing 1606 * happen (calling the item's Runnable or sending a message to its Handler 1607 * as appropriate). You can use this method for any items for which you 1608 * would like to do processing without those other facilities. 1609 * <p> 1610 * Use {@link MenuItem#getMenuInfo()} to get extra information set by the 1611 * View that added this menu item. 1612 * <p> 1613 * Derived classes should call through to the base class for it to perform 1614 * the default menu handling. 1615 * 1616 * @param item The context menu item that was selected. 1617 * @return boolean Return false to allow normal context menu processing to 1618 * proceed, true to consume it here. 1619 */ 1620 public boolean onContextItemSelected(MenuItem item) { 1621 return false; 1622 } 1623 1624 /** 1625 * When custom transitions are used with Fragments, the enter transition callback 1626 * is called when this Fragment is attached or detached when not popping the back stack. 1627 * 1628 * @param callback Used to manipulate the shared element transitions on this Fragment 1629 * when added not as a pop from the back stack. 1630 */ 1631 public void setEnterSharedElementTransitionCallback(SharedElementCallback callback) { 1632 if (callback == null) { 1633 callback = SharedElementCallback.NULL_CALLBACK; 1634 } 1635 mEnterTransitionCallback = callback; 1636 } 1637 1638 /** 1639 * When custom transitions are used with Fragments, the exit transition callback 1640 * is called when this Fragment is attached or detached when popping the back stack. 1641 * 1642 * @param callback Used to manipulate the shared element transitions on this Fragment 1643 * when added as a pop from the back stack. 1644 */ 1645 public void setExitSharedElementTransitionCallback(SharedElementCallback callback) { 1646 if (callback == null) { 1647 callback = SharedElementCallback.NULL_CALLBACK; 1648 } 1649 mExitTransitionCallback = callback; 1650 } 1651 1652 /** 1653 * Sets the Transition that will be used to move Views into the initial scene. The entering 1654 * Views will be those that are regular Views or ViewGroups that have 1655 * {@link ViewGroup#isTransitionGroup} return true. Typical Transitions will extend 1656 * {@link android.transition.Visibility} as entering is governed by changing visibility from 1657 * {@link View#INVISIBLE} to {@link View#VISIBLE}. If <code>transition</code> is null, 1658 * entering Views will remain unaffected. 1659 * 1660 * @param transition The Transition to use to move Views into the initial Scene. 1661 * @attr ref android.R.styleable#Fragment_fragmentEnterTransition 1662 */ 1663 public void setEnterTransition(Transition transition) { 1664 mEnterTransition = transition; 1665 } 1666 1667 /** 1668 * Returns the Transition that will be used to move Views into the initial scene. The entering 1669 * Views will be those that are regular Views or ViewGroups that have 1670 * {@link ViewGroup#isTransitionGroup} return true. Typical Transitions will extend 1671 * {@link android.transition.Visibility} as entering is governed by changing visibility from 1672 * {@link View#INVISIBLE} to {@link View#VISIBLE}. 1673 * 1674 * @return the Transition to use to move Views into the initial Scene. 1675 * @attr ref android.R.styleable#Fragment_fragmentEnterTransition 1676 */ 1677 public Transition getEnterTransition() { 1678 return mEnterTransition; 1679 } 1680 1681 /** 1682 * Sets the Transition that will be used to move Views out of the scene when the Fragment is 1683 * preparing to be removed, hidden, or detached because of popping the back stack. The exiting 1684 * Views will be those that are regular Views or ViewGroups that have 1685 * {@link ViewGroup#isTransitionGroup} return true. Typical Transitions will extend 1686 * {@link android.transition.Visibility} as entering is governed by changing visibility from 1687 * {@link View#VISIBLE} to {@link View#INVISIBLE}. If <code>transition</code> is null, 1688 * entering Views will remain unaffected. If nothing is set, the default will be to 1689 * use the same value as set in {@link #setEnterTransition(android.transition.Transition)}. 1690 * 1691 * @param transition The Transition to use to move Views out of the Scene when the Fragment 1692 * is preparing to close. 1693 * @attr ref android.R.styleable#Fragment_fragmentExitTransition 1694 */ 1695 public void setReturnTransition(Transition transition) { 1696 mReturnTransition = transition; 1697 } 1698 1699 /** 1700 * Returns the Transition that will be used to move Views out of the scene when the Fragment is 1701 * preparing to be removed, hidden, or detached because of popping the back stack. The exiting 1702 * Views will be those that are regular Views or ViewGroups that have 1703 * {@link ViewGroup#isTransitionGroup} return true. Typical Transitions will extend 1704 * {@link android.transition.Visibility} as entering is governed by changing visibility from 1705 * {@link View#VISIBLE} to {@link View#INVISIBLE}. If <code>transition</code> is null, 1706 * entering Views will remain unaffected. 1707 * 1708 * @return the Transition to use to move Views out of the Scene when the Fragment 1709 * is preparing to close. 1710 * @attr ref android.R.styleable#Fragment_fragmentExitTransition 1711 */ 1712 public Transition getReturnTransition() { 1713 return mReturnTransition == USE_DEFAULT_TRANSITION ? getEnterTransition() 1714 : mReturnTransition; 1715 } 1716 1717 /** 1718 * Sets the Transition that will be used to move Views out of the scene when the 1719 * fragment is removed, hidden, or detached when not popping the back stack. 1720 * The exiting Views will be those that are regular Views or ViewGroups that 1721 * have {@link ViewGroup#isTransitionGroup} return true. Typical Transitions will extend 1722 * {@link android.transition.Visibility} as exiting is governed by changing visibility 1723 * from {@link View#VISIBLE} to {@link View#INVISIBLE}. If transition is null, the views will 1724 * remain unaffected. 1725 * 1726 * @param transition The Transition to use to move Views out of the Scene when the Fragment 1727 * is being closed not due to popping the back stack. 1728 * @attr ref android.R.styleable#Fragment_fragmentExitTransition 1729 */ 1730 public void setExitTransition(Transition transition) { 1731 mExitTransition = transition; 1732 } 1733 1734 /** 1735 * Returns the Transition that will be used to move Views out of the scene when the 1736 * fragment is removed, hidden, or detached when not popping the back stack. 1737 * The exiting Views will be those that are regular Views or ViewGroups that 1738 * have {@link ViewGroup#isTransitionGroup} return true. Typical Transitions will extend 1739 * {@link android.transition.Visibility} as exiting is governed by changing visibility 1740 * from {@link View#VISIBLE} to {@link View#INVISIBLE}. If transition is null, the views will 1741 * remain unaffected. 1742 * 1743 * @return the Transition to use to move Views out of the Scene when the Fragment 1744 * is being closed not due to popping the back stack. 1745 * @attr ref android.R.styleable#Fragment_fragmentExitTransition 1746 */ 1747 public Transition getExitTransition() { 1748 return mExitTransition; 1749 } 1750 1751 /** 1752 * Sets the Transition that will be used to move Views in to the scene when returning due 1753 * to popping a back stack. The entering Views will be those that are regular Views 1754 * or ViewGroups that have {@link ViewGroup#isTransitionGroup} return true. Typical Transitions 1755 * will extend {@link android.transition.Visibility} as exiting is governed by changing 1756 * visibility from {@link View#VISIBLE} to {@link View#INVISIBLE}. If transition is null, 1757 * the views will remain unaffected. If nothing is set, the default will be to use the same 1758 * transition as {@link #setExitTransition(android.transition.Transition)}. 1759 * 1760 * @param transition The Transition to use to move Views into the scene when reentering from a 1761 * previously-started Activity. 1762 * @attr ref android.R.styleable#Fragment_fragmentReenterTransition 1763 */ 1764 public void setReenterTransition(Transition transition) { 1765 mReenterTransition = transition; 1766 } 1767 1768 /** 1769 * Returns the Transition that will be used to move Views in to the scene when returning due 1770 * to popping a back stack. The entering Views will be those that are regular Views 1771 * or ViewGroups that have {@link ViewGroup#isTransitionGroup} return true. Typical Transitions 1772 * will extend {@link android.transition.Visibility} as exiting is governed by changing 1773 * visibility from {@link View#VISIBLE} to {@link View#INVISIBLE}. If transition is null, 1774 * the views will remain unaffected. If nothing is set, the default will be to use the same 1775 * transition as {@link #setExitTransition(android.transition.Transition)}. 1776 * 1777 * @return the Transition to use to move Views into the scene when reentering from a 1778 * previously-started Activity. 1779 * @attr ref android.R.styleable#Fragment_fragmentReenterTransition 1780 */ 1781 public Transition getReenterTransition() { 1782 return mReenterTransition == USE_DEFAULT_TRANSITION ? getExitTransition() 1783 : mReenterTransition; 1784 } 1785 1786 /** 1787 * Sets the Transition that will be used for shared elements transferred into the content 1788 * Scene. Typical Transitions will affect size and location, such as 1789 * {@link android.transition.ChangeBounds}. A null 1790 * value will cause transferred shared elements to blink to the final position. 1791 * 1792 * @param transition The Transition to use for shared elements transferred into the content 1793 * Scene. 1794 * @attr ref android.R.styleable#Fragment_fragmentSharedElementEnterTransition 1795 */ 1796 public void setSharedElementEnterTransition(Transition transition) { 1797 mSharedElementEnterTransition = transition; 1798 } 1799 1800 /** 1801 * Returns the Transition that will be used for shared elements transferred into the content 1802 * Scene. Typical Transitions will affect size and location, such as 1803 * {@link android.transition.ChangeBounds}. A null 1804 * value will cause transferred shared elements to blink to the final position. 1805 * 1806 * @return The Transition to use for shared elements transferred into the content 1807 * Scene. 1808 * @attr ref android.R.styleable#Fragment_fragmentSharedElementEnterTransition 1809 */ 1810 public Transition getSharedElementEnterTransition() { 1811 return mSharedElementEnterTransition; 1812 } 1813 1814 /** 1815 * Sets the Transition that will be used for shared elements transferred back during a 1816 * pop of the back stack. This Transition acts in the leaving Fragment. 1817 * Typical Transitions will affect size and location, such as 1818 * {@link android.transition.ChangeBounds}. A null 1819 * value will cause transferred shared elements to blink to the final position. 1820 * If no value is set, the default will be to use the same value as 1821 * {@link #setSharedElementEnterTransition(android.transition.Transition)}. 1822 * 1823 * @param transition The Transition to use for shared elements transferred out of the content 1824 * Scene. 1825 * @attr ref android.R.styleable#Fragment_fragmentSharedElementReturnTransition 1826 */ 1827 public void setSharedElementReturnTransition(Transition transition) { 1828 mSharedElementReturnTransition = transition; 1829 } 1830 1831 /** 1832 * Return the Transition that will be used for shared elements transferred back during a 1833 * pop of the back stack. This Transition acts in the leaving Fragment. 1834 * Typical Transitions will affect size and location, such as 1835 * {@link android.transition.ChangeBounds}. A null 1836 * value will cause transferred shared elements to blink to the final position. 1837 * If no value is set, the default will be to use the same value as 1838 * {@link #setSharedElementEnterTransition(android.transition.Transition)}. 1839 * 1840 * @return The Transition to use for shared elements transferred out of the content 1841 * Scene. 1842 * @attr ref android.R.styleable#Fragment_fragmentSharedElementReturnTransition 1843 */ 1844 public Transition getSharedElementReturnTransition() { 1845 return mSharedElementReturnTransition == USE_DEFAULT_TRANSITION ? 1846 getSharedElementEnterTransition() : mSharedElementReturnTransition; 1847 } 1848 1849 /** 1850 * Sets whether the the exit transition and enter transition overlap or not. 1851 * When true, the enter transition will start as soon as possible. When false, the 1852 * enter transition will wait until the exit transition completes before starting. 1853 * 1854 * @param allow true to start the enter transition when possible or false to 1855 * wait until the exiting transition completes. 1856 * @attr ref android.R.styleable#Fragment_fragmentAllowEnterTransitionOverlap 1857 */ 1858 public void setAllowEnterTransitionOverlap(boolean allow) { 1859 mAllowEnterTransitionOverlap = allow; 1860 } 1861 1862 /** 1863 * Returns whether the the exit transition and enter transition overlap or not. 1864 * When true, the enter transition will start as soon as possible. When false, the 1865 * enter transition will wait until the exit transition completes before starting. 1866 * 1867 * @return true when the enter transition should start as soon as possible or false to 1868 * when it should wait until the exiting transition completes. 1869 * @attr ref android.R.styleable#Fragment_fragmentAllowEnterTransitionOverlap 1870 */ 1871 public boolean getAllowEnterTransitionOverlap() { 1872 return (mAllowEnterTransitionOverlap == null) ? true : mAllowEnterTransitionOverlap; 1873 } 1874 1875 /** 1876 * Sets whether the the return transition and reenter transition overlap or not. 1877 * When true, the reenter transition will start as soon as possible. When false, the 1878 * reenter transition will wait until the return transition completes before starting. 1879 * 1880 * @param allow true to start the reenter transition when possible or false to wait until the 1881 * return transition completes. 1882 * @attr ref android.R.styleable#Fragment_fragmentAllowReturnTransitionOverlap 1883 */ 1884 public void setAllowReturnTransitionOverlap(boolean allow) { 1885 mAllowReturnTransitionOverlap = allow; 1886 } 1887 1888 /** 1889 * Returns whether the the return transition and reenter transition overlap or not. 1890 * When true, the reenter transition will start as soon as possible. When false, the 1891 * reenter transition will wait until the return transition completes before starting. 1892 * 1893 * @return true to start the reenter transition when possible or false to wait until the 1894 * return transition completes. 1895 * @attr ref android.R.styleable#Fragment_fragmentAllowReturnTransitionOverlap 1896 */ 1897 public boolean getAllowReturnTransitionOverlap() { 1898 return (mAllowReturnTransitionOverlap == null) ? true : mAllowReturnTransitionOverlap; 1899 } 1900 1901 /** 1902 * Print the Fragments's state into the given stream. 1903 * 1904 * @param prefix Text to print at the front of each line. 1905 * @param fd The raw file descriptor that the dump is being sent to. 1906 * @param writer The PrintWriter to which you should dump your state. This will be 1907 * closed for you after you return. 1908 * @param args additional arguments to the dump request. 1909 */ 1910 public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) { 1911 writer.print(prefix); writer.print("mFragmentId=#"); 1912 writer.print(Integer.toHexString(mFragmentId)); 1913 writer.print(" mContainerId=#"); 1914 writer.print(Integer.toHexString(mContainerId)); 1915 writer.print(" mTag="); writer.println(mTag); 1916 writer.print(prefix); writer.print("mState="); writer.print(mState); 1917 writer.print(" mIndex="); writer.print(mIndex); 1918 writer.print(" mWho="); writer.print(mWho); 1919 writer.print(" mBackStackNesting="); writer.println(mBackStackNesting); 1920 writer.print(prefix); writer.print("mAdded="); writer.print(mAdded); 1921 writer.print(" mRemoving="); writer.print(mRemoving); 1922 writer.print(" mResumed="); writer.print(mResumed); 1923 writer.print(" mFromLayout="); writer.print(mFromLayout); 1924 writer.print(" mInLayout="); writer.println(mInLayout); 1925 writer.print(prefix); writer.print("mHidden="); writer.print(mHidden); 1926 writer.print(" mDetached="); writer.print(mDetached); 1927 writer.print(" mMenuVisible="); writer.print(mMenuVisible); 1928 writer.print(" mHasMenu="); writer.println(mHasMenu); 1929 writer.print(prefix); writer.print("mRetainInstance="); writer.print(mRetainInstance); 1930 writer.print(" mRetaining="); writer.print(mRetaining); 1931 writer.print(" mUserVisibleHint="); writer.println(mUserVisibleHint); 1932 if (mFragmentManager != null) { 1933 writer.print(prefix); writer.print("mFragmentManager="); 1934 writer.println(mFragmentManager); 1935 } 1936 if (mActivity != null) { 1937 writer.print(prefix); writer.print("mActivity="); 1938 writer.println(mActivity); 1939 } 1940 if (mParentFragment != null) { 1941 writer.print(prefix); writer.print("mParentFragment="); 1942 writer.println(mParentFragment); 1943 } 1944 if (mArguments != null) { 1945 writer.print(prefix); writer.print("mArguments="); writer.println(mArguments); 1946 } 1947 if (mSavedFragmentState != null) { 1948 writer.print(prefix); writer.print("mSavedFragmentState="); 1949 writer.println(mSavedFragmentState); 1950 } 1951 if (mSavedViewState != null) { 1952 writer.print(prefix); writer.print("mSavedViewState="); 1953 writer.println(mSavedViewState); 1954 } 1955 if (mTarget != null) { 1956 writer.print(prefix); writer.print("mTarget="); writer.print(mTarget); 1957 writer.print(" mTargetRequestCode="); 1958 writer.println(mTargetRequestCode); 1959 } 1960 if (mNextAnim != 0) { 1961 writer.print(prefix); writer.print("mNextAnim="); writer.println(mNextAnim); 1962 } 1963 if (mContainer != null) { 1964 writer.print(prefix); writer.print("mContainer="); writer.println(mContainer); 1965 } 1966 if (mView != null) { 1967 writer.print(prefix); writer.print("mView="); writer.println(mView); 1968 } 1969 if (mAnimatingAway != null) { 1970 writer.print(prefix); writer.print("mAnimatingAway="); writer.println(mAnimatingAway); 1971 writer.print(prefix); writer.print("mStateAfterAnimating="); 1972 writer.println(mStateAfterAnimating); 1973 } 1974 if (mLoaderManager != null) { 1975 writer.print(prefix); writer.println("Loader Manager:"); 1976 mLoaderManager.dump(prefix + " ", fd, writer, args); 1977 } 1978 if (mChildFragmentManager != null) { 1979 writer.print(prefix); writer.println("Child " + mChildFragmentManager + ":"); 1980 mChildFragmentManager.dump(prefix + " ", fd, writer, args); 1981 } 1982 } 1983 1984 Fragment findFragmentByWho(String who) { 1985 if (who.equals(mWho)) { 1986 return this; 1987 } 1988 if (mChildFragmentManager != null) { 1989 return mChildFragmentManager.findFragmentByWho(who); 1990 } 1991 return null; 1992 } 1993 1994 void instantiateChildFragmentManager() { 1995 mChildFragmentManager = new FragmentManagerImpl(); 1996 mChildFragmentManager.attachActivity(mActivity, new FragmentContainer() { 1997 @Override 1998 public View findViewById(int id) { 1999 if (mView == null) { 2000 throw new IllegalStateException("Fragment does not have a view"); 2001 } 2002 return mView.findViewById(id); 2003 } 2004 }, this); 2005 } 2006 2007 void performCreate(Bundle savedInstanceState) { 2008 if (mChildFragmentManager != null) { 2009 mChildFragmentManager.noteStateNotSaved(); 2010 } 2011 mCalled = false; 2012 onCreate(savedInstanceState); 2013 if (!mCalled) { 2014 throw new SuperNotCalledException("Fragment " + this 2015 + " did not call through to super.onCreate()"); 2016 } 2017 if (savedInstanceState != null) { 2018 Parcelable p = savedInstanceState.getParcelable(Activity.FRAGMENTS_TAG); 2019 if (p != null) { 2020 if (mChildFragmentManager == null) { 2021 instantiateChildFragmentManager(); 2022 } 2023 mChildFragmentManager.restoreAllState(p, null); 2024 mChildFragmentManager.dispatchCreate(); 2025 } 2026 } 2027 } 2028 2029 View performCreateView(LayoutInflater inflater, ViewGroup container, 2030 Bundle savedInstanceState) { 2031 if (mChildFragmentManager != null) { 2032 mChildFragmentManager.noteStateNotSaved(); 2033 } 2034 return onCreateView(inflater, container, savedInstanceState); 2035 } 2036 2037 void performActivityCreated(Bundle savedInstanceState) { 2038 if (mChildFragmentManager != null) { 2039 mChildFragmentManager.noteStateNotSaved(); 2040 } 2041 mCalled = false; 2042 onActivityCreated(savedInstanceState); 2043 if (!mCalled) { 2044 throw new SuperNotCalledException("Fragment " + this 2045 + " did not call through to super.onActivityCreated()"); 2046 } 2047 if (mChildFragmentManager != null) { 2048 mChildFragmentManager.dispatchActivityCreated(); 2049 } 2050 } 2051 2052 void performStart() { 2053 if (mChildFragmentManager != null) { 2054 mChildFragmentManager.noteStateNotSaved(); 2055 mChildFragmentManager.execPendingActions(); 2056 } 2057 mCalled = false; 2058 onStart(); 2059 if (!mCalled) { 2060 throw new SuperNotCalledException("Fragment " + this 2061 + " did not call through to super.onStart()"); 2062 } 2063 if (mChildFragmentManager != null) { 2064 mChildFragmentManager.dispatchStart(); 2065 } 2066 if (mLoaderManager != null) { 2067 mLoaderManager.doReportStart(); 2068 } 2069 } 2070 2071 void performResume() { 2072 if (mChildFragmentManager != null) { 2073 mChildFragmentManager.noteStateNotSaved(); 2074 mChildFragmentManager.execPendingActions(); 2075 } 2076 mCalled = false; 2077 onResume(); 2078 if (!mCalled) { 2079 throw new SuperNotCalledException("Fragment " + this 2080 + " did not call through to super.onResume()"); 2081 } 2082 if (mChildFragmentManager != null) { 2083 mChildFragmentManager.dispatchResume(); 2084 mChildFragmentManager.execPendingActions(); 2085 } 2086 } 2087 2088 void performConfigurationChanged(Configuration newConfig) { 2089 onConfigurationChanged(newConfig); 2090 if (mChildFragmentManager != null) { 2091 mChildFragmentManager.dispatchConfigurationChanged(newConfig); 2092 } 2093 } 2094 2095 void performLowMemory() { 2096 onLowMemory(); 2097 if (mChildFragmentManager != null) { 2098 mChildFragmentManager.dispatchLowMemory(); 2099 } 2100 } 2101 2102 void performTrimMemory(int level) { 2103 onTrimMemory(level); 2104 if (mChildFragmentManager != null) { 2105 mChildFragmentManager.dispatchTrimMemory(level); 2106 } 2107 } 2108 2109 boolean performCreateOptionsMenu(Menu menu, MenuInflater inflater) { 2110 boolean show = false; 2111 if (!mHidden) { 2112 if (mHasMenu && mMenuVisible) { 2113 show = true; 2114 onCreateOptionsMenu(menu, inflater); 2115 } 2116 if (mChildFragmentManager != null) { 2117 show |= mChildFragmentManager.dispatchCreateOptionsMenu(menu, inflater); 2118 } 2119 } 2120 return show; 2121 } 2122 2123 boolean performPrepareOptionsMenu(Menu menu) { 2124 boolean show = false; 2125 if (!mHidden) { 2126 if (mHasMenu && mMenuVisible) { 2127 show = true; 2128 onPrepareOptionsMenu(menu); 2129 } 2130 if (mChildFragmentManager != null) { 2131 show |= mChildFragmentManager.dispatchPrepareOptionsMenu(menu); 2132 } 2133 } 2134 return show; 2135 } 2136 2137 boolean performOptionsItemSelected(MenuItem item) { 2138 if (!mHidden) { 2139 if (mHasMenu && mMenuVisible) { 2140 if (onOptionsItemSelected(item)) { 2141 return true; 2142 } 2143 } 2144 if (mChildFragmentManager != null) { 2145 if (mChildFragmentManager.dispatchOptionsItemSelected(item)) { 2146 return true; 2147 } 2148 } 2149 } 2150 return false; 2151 } 2152 2153 boolean performContextItemSelected(MenuItem item) { 2154 if (!mHidden) { 2155 if (onContextItemSelected(item)) { 2156 return true; 2157 } 2158 if (mChildFragmentManager != null) { 2159 if (mChildFragmentManager.dispatchContextItemSelected(item)) { 2160 return true; 2161 } 2162 } 2163 } 2164 return false; 2165 } 2166 2167 void performOptionsMenuClosed(Menu menu) { 2168 if (!mHidden) { 2169 if (mHasMenu && mMenuVisible) { 2170 onOptionsMenuClosed(menu); 2171 } 2172 if (mChildFragmentManager != null) { 2173 mChildFragmentManager.dispatchOptionsMenuClosed(menu); 2174 } 2175 } 2176 } 2177 2178 void performSaveInstanceState(Bundle outState) { 2179 onSaveInstanceState(outState); 2180 if (mChildFragmentManager != null) { 2181 Parcelable p = mChildFragmentManager.saveAllState(); 2182 if (p != null) { 2183 outState.putParcelable(Activity.FRAGMENTS_TAG, p); 2184 } 2185 } 2186 } 2187 2188 void performPause() { 2189 if (mChildFragmentManager != null) { 2190 mChildFragmentManager.dispatchPause(); 2191 } 2192 mCalled = false; 2193 onPause(); 2194 if (!mCalled) { 2195 throw new SuperNotCalledException("Fragment " + this 2196 + " did not call through to super.onPause()"); 2197 } 2198 } 2199 2200 void performStop() { 2201 if (mChildFragmentManager != null) { 2202 mChildFragmentManager.dispatchStop(); 2203 } 2204 mCalled = false; 2205 onStop(); 2206 if (!mCalled) { 2207 throw new SuperNotCalledException("Fragment " + this 2208 + " did not call through to super.onStop()"); 2209 } 2210 2211 if (mLoadersStarted) { 2212 mLoadersStarted = false; 2213 if (!mCheckedForLoaderManager) { 2214 mCheckedForLoaderManager = true; 2215 mLoaderManager = mActivity.getLoaderManager(mWho, mLoadersStarted, false); 2216 } 2217 if (mLoaderManager != null) { 2218 if (mActivity == null || !mActivity.mChangingConfigurations) { 2219 mLoaderManager.doStop(); 2220 } else { 2221 mLoaderManager.doRetain(); 2222 } 2223 } 2224 } 2225 } 2226 2227 void performDestroyView() { 2228 if (mChildFragmentManager != null) { 2229 mChildFragmentManager.dispatchDestroyView(); 2230 } 2231 mCalled = false; 2232 onDestroyView(); 2233 if (!mCalled) { 2234 throw new SuperNotCalledException("Fragment " + this 2235 + " did not call through to super.onDestroyView()"); 2236 } 2237 if (mLoaderManager != null) { 2238 mLoaderManager.doReportNextStart(); 2239 } 2240 } 2241 2242 void performDestroy() { 2243 if (mChildFragmentManager != null) { 2244 mChildFragmentManager.dispatchDestroy(); 2245 } 2246 mCalled = false; 2247 onDestroy(); 2248 if (!mCalled) { 2249 throw new SuperNotCalledException("Fragment " + this 2250 + " did not call through to super.onDestroy()"); 2251 } 2252 } 2253 2254 private static Transition loadTransition(Context context, TypedArray typedArray, 2255 Transition currentValue, Transition defaultValue, int id) { 2256 if (currentValue != defaultValue) { 2257 return currentValue; 2258 } 2259 int transitionId = typedArray.getResourceId(id, 0); 2260 Transition transition = defaultValue; 2261 if (transitionId != 0 && transitionId != com.android.internal.R.transition.no_transition) { 2262 TransitionInflater inflater = TransitionInflater.from(context); 2263 transition = inflater.inflateTransition(transitionId); 2264 if (transition instanceof TransitionSet && 2265 ((TransitionSet)transition).getTransitionCount() == 0) { 2266 transition = null; 2267 } 2268 } 2269 return transition; 2270 } 2271 2272} 2273