FragmentManager.java revision 5b9fbc316b9c49c57ffbdcdcef1ee83171fd189a
1/* 2 * Copyright (C) 2011 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.support.v4.app; 18 19import static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP; 20 21import android.animation.Animator; 22import android.animation.AnimatorInflater; 23import android.animation.AnimatorListenerAdapter; 24import android.animation.AnimatorSet; 25import android.animation.PropertyValuesHolder; 26import android.animation.ValueAnimator; 27import android.content.Context; 28import android.content.res.Configuration; 29import android.content.res.Resources.NotFoundException; 30import android.content.res.TypedArray; 31import android.os.Build; 32import android.os.Bundle; 33import android.os.Looper; 34import android.os.Parcel; 35import android.os.Parcelable; 36import android.support.annotation.CallSuper; 37import android.support.annotation.IdRes; 38import android.support.annotation.NonNull; 39import android.support.annotation.RestrictTo; 40import android.support.annotation.StringRes; 41import android.support.v4.util.ArraySet; 42import android.support.v4.util.DebugUtils; 43import android.support.v4.util.LogWriter; 44import android.support.v4.util.Pair; 45import android.support.v4.view.ViewCompat; 46import android.util.AttributeSet; 47import android.util.Log; 48import android.util.SparseArray; 49import android.view.LayoutInflater; 50import android.view.Menu; 51import android.view.MenuInflater; 52import android.view.MenuItem; 53import android.view.View; 54import android.view.ViewGroup; 55import android.view.animation.AccelerateInterpolator; 56import android.view.animation.AlphaAnimation; 57import android.view.animation.Animation; 58import android.view.animation.Animation.AnimationListener; 59import android.view.animation.AnimationSet; 60import android.view.animation.AnimationUtils; 61import android.view.animation.DecelerateInterpolator; 62import android.view.animation.Interpolator; 63import android.view.animation.ScaleAnimation; 64 65import java.io.FileDescriptor; 66import java.io.PrintWriter; 67import java.lang.reflect.Field; 68import java.util.ArrayList; 69import java.util.Arrays; 70import java.util.Collections; 71import java.util.List; 72import java.util.concurrent.CopyOnWriteArrayList; 73 74/** 75 * Static library support version of the framework's {@link android.app.FragmentManager}. 76 * Used to write apps that run on platforms prior to Android 3.0. When running 77 * on Android 3.0 or above, this implementation is still used; it does not try 78 * to switch to the framework's implementation. See the framework {@link FragmentManager} 79 * documentation for a class overview. 80 * 81 * <p>Your activity must derive from {@link FragmentActivity} to use this. From such an activity, 82 * you can acquire the {@link FragmentManager} by calling 83 * {@link FragmentActivity#getSupportFragmentManager}. 84 */ 85public abstract class FragmentManager { 86 /** 87 * Representation of an entry on the fragment back stack, as created 88 * with {@link FragmentTransaction#addToBackStack(String) 89 * FragmentTransaction.addToBackStack()}. Entries can later be 90 * retrieved with {@link FragmentManager#getBackStackEntryAt(int) 91 * FragmentManager.getBackStackEntryAt()}. 92 * 93 * <p>Note that you should never hold on to a BackStackEntry object; 94 * the identifier as returned by {@link #getId} is the only thing that 95 * will be persisted across activity instances. 96 */ 97 public interface BackStackEntry { 98 /** 99 * Return the unique identifier for the entry. This is the only 100 * representation of the entry that will persist across activity 101 * instances. 102 */ 103 public int getId(); 104 105 /** 106 * Get the name that was supplied to 107 * {@link FragmentTransaction#addToBackStack(String) 108 * FragmentTransaction.addToBackStack(String)} when creating this entry. 109 */ 110 public String getName(); 111 112 /** 113 * Return the full bread crumb title resource identifier for the entry, 114 * or 0 if it does not have one. 115 */ 116 @StringRes 117 public int getBreadCrumbTitleRes(); 118 119 /** 120 * Return the short bread crumb title resource identifier for the entry, 121 * or 0 if it does not have one. 122 */ 123 @StringRes 124 public int getBreadCrumbShortTitleRes(); 125 126 /** 127 * Return the full bread crumb title for the entry, or null if it 128 * does not have one. 129 */ 130 public CharSequence getBreadCrumbTitle(); 131 132 /** 133 * Return the short bread crumb title for the entry, or null if it 134 * does not have one. 135 */ 136 public CharSequence getBreadCrumbShortTitle(); 137 } 138 139 /** 140 * Interface to watch for changes to the back stack. 141 */ 142 public interface OnBackStackChangedListener { 143 /** 144 * Called whenever the contents of the back stack change. 145 */ 146 public void onBackStackChanged(); 147 } 148 149 /** 150 * Start a series of edit operations on the Fragments associated with 151 * this FragmentManager. 152 * 153 * <p>Note: A fragment transaction can only be created/committed prior 154 * to an activity saving its state. If you try to commit a transaction 155 * after {@link FragmentActivity#onSaveInstanceState FragmentActivity.onSaveInstanceState()} 156 * (and prior to a following {@link FragmentActivity#onStart FragmentActivity.onStart} 157 * or {@link FragmentActivity#onResume FragmentActivity.onResume()}, you will get an error. 158 * This is because the framework takes care of saving your current fragments 159 * in the state, and if changes are made after the state is saved then they 160 * will be lost.</p> 161 */ 162 public abstract FragmentTransaction beginTransaction(); 163 164 /** 165 * @hide -- remove once prebuilts are in. 166 * @deprecated 167 */ 168 @RestrictTo(LIBRARY_GROUP) 169 @Deprecated 170 public FragmentTransaction openTransaction() { 171 return beginTransaction(); 172 } 173 174 /** 175 * After a {@link FragmentTransaction} is committed with 176 * {@link FragmentTransaction#commit FragmentTransaction.commit()}, it 177 * is scheduled to be executed asynchronously on the process's main thread. 178 * If you want to immediately executing any such pending operations, you 179 * can call this function (only from the main thread) to do so. Note that 180 * all callbacks and other related behavior will be done from within this 181 * call, so be careful about where this is called from. 182 * 183 * <p>If you are committing a single transaction that does not modify the 184 * fragment back stack, strongly consider using 185 * {@link FragmentTransaction#commitNow()} instead. This can help avoid 186 * unwanted side effects when other code in your app has pending committed 187 * transactions that expect different timing.</p> 188 * <p> 189 * This also forces the start of any postponed Transactions where 190 * {@link Fragment#postponeEnterTransition()} has been called. 191 * 192 * @return Returns true if there were any pending transactions to be 193 * executed. 194 */ 195 public abstract boolean executePendingTransactions(); 196 197 /** 198 * Finds a fragment that was identified by the given id either when inflated 199 * from XML or as the container ID when added in a transaction. This first 200 * searches through fragments that are currently added to the manager's 201 * activity; if no such fragment is found, then all fragments currently 202 * on the back stack associated with this ID are searched. 203 * @return The fragment if found or null otherwise. 204 */ 205 public abstract Fragment findFragmentById(@IdRes int id); 206 207 /** 208 * Finds a fragment that was identified by the given tag either when inflated 209 * from XML or as supplied when added in a transaction. This first 210 * searches through fragments that are currently added to the manager's 211 * activity; if no such fragment is found, then all fragments currently 212 * on the back stack are searched. 213 * @return The fragment if found or null otherwise. 214 */ 215 public abstract Fragment findFragmentByTag(String tag); 216 217 /** 218 * Flag for {@link #popBackStack(String, int)} 219 * and {@link #popBackStack(int, int)}: If set, and the name or ID of 220 * a back stack entry has been supplied, then all matching entries will 221 * be consumed until one that doesn't match is found or the bottom of 222 * the stack is reached. Otherwise, all entries up to but not including that entry 223 * will be removed. 224 */ 225 public static final int POP_BACK_STACK_INCLUSIVE = 1<<0; 226 227 /** 228 * Pop the top state off the back stack. Returns true if there was one 229 * to pop, else false. This function is asynchronous -- it enqueues the 230 * request to pop, but the action will not be performed until the application 231 * returns to its event loop. 232 */ 233 public abstract void popBackStack(); 234 235 /** 236 * Like {@link #popBackStack()}, but performs the operation immediately 237 * inside of the call. This is like calling {@link #executePendingTransactions()} 238 * afterwards without forcing the start of postponed Transactions. 239 * @return Returns true if there was something popped, else false. 240 */ 241 public abstract boolean popBackStackImmediate(); 242 243 /** 244 * Pop the last fragment transition from the manager's fragment 245 * back stack. If there is nothing to pop, false is returned. 246 * This function is asynchronous -- it enqueues the 247 * request to pop, but the action will not be performed until the application 248 * returns to its event loop. 249 * 250 * @param name If non-null, this is the name of a previous back state 251 * to look for; if found, all states up to that state will be popped. The 252 * {@link #POP_BACK_STACK_INCLUSIVE} flag can be used to control whether 253 * the named state itself is popped. If null, only the top state is popped. 254 * @param flags Either 0 or {@link #POP_BACK_STACK_INCLUSIVE}. 255 */ 256 public abstract void popBackStack(String name, int flags); 257 258 /** 259 * Like {@link #popBackStack(String, int)}, but performs the operation immediately 260 * inside of the call. This is like calling {@link #executePendingTransactions()} 261 * afterwards without forcing the start of postponed Transactions. 262 * @return Returns true if there was something popped, else false. 263 */ 264 public abstract boolean popBackStackImmediate(String name, int flags); 265 266 /** 267 * Pop all back stack states up to the one with the given identifier. 268 * This function is asynchronous -- it enqueues the 269 * request to pop, but the action will not be performed until the application 270 * returns to its event loop. 271 * 272 * @param id Identifier of the stated to be popped. If no identifier exists, 273 * false is returned. 274 * The identifier is the number returned by 275 * {@link FragmentTransaction#commit() FragmentTransaction.commit()}. The 276 * {@link #POP_BACK_STACK_INCLUSIVE} flag can be used to control whether 277 * the named state itself is popped. 278 * @param flags Either 0 or {@link #POP_BACK_STACK_INCLUSIVE}. 279 */ 280 public abstract void popBackStack(int id, int flags); 281 282 /** 283 * Like {@link #popBackStack(int, int)}, but performs the operation immediately 284 * inside of the call. This is like calling {@link #executePendingTransactions()} 285 * afterwards without forcing the start of postponed Transactions. 286 * @return Returns true if there was something popped, else false. 287 */ 288 public abstract boolean popBackStackImmediate(int id, int flags); 289 290 /** 291 * Return the number of entries currently in the back stack. 292 */ 293 public abstract int getBackStackEntryCount(); 294 295 /** 296 * Return the BackStackEntry at index <var>index</var> in the back stack; 297 * entries start index 0 being the bottom of the stack. 298 */ 299 public abstract BackStackEntry getBackStackEntryAt(int index); 300 301 /** 302 * Add a new listener for changes to the fragment back stack. 303 */ 304 public abstract void addOnBackStackChangedListener(OnBackStackChangedListener listener); 305 306 /** 307 * Remove a listener that was previously added with 308 * {@link #addOnBackStackChangedListener(OnBackStackChangedListener)}. 309 */ 310 public abstract void removeOnBackStackChangedListener(OnBackStackChangedListener listener); 311 312 /** 313 * Put a reference to a fragment in a Bundle. This Bundle can be 314 * persisted as saved state, and when later restoring 315 * {@link #getFragment(Bundle, String)} will return the current 316 * instance of the same fragment. 317 * 318 * @param bundle The bundle in which to put the fragment reference. 319 * @param key The name of the entry in the bundle. 320 * @param fragment The Fragment whose reference is to be stored. 321 */ 322 public abstract void putFragment(Bundle bundle, String key, Fragment fragment); 323 324 /** 325 * Retrieve the current Fragment instance for a reference previously 326 * placed with {@link #putFragment(Bundle, String, Fragment)}. 327 * 328 * @param bundle The bundle from which to retrieve the fragment reference. 329 * @param key The name of the entry in the bundle. 330 * @return Returns the current Fragment instance that is associated with 331 * the given reference. 332 */ 333 public abstract Fragment getFragment(Bundle bundle, String key); 334 335 /** 336 * Get a list of all fragments that are currently added to the FragmentManager. 337 * This may include those that are hidden as well as those that are shown. 338 * This will not include any fragments only in the back stack, or fragments that 339 * are detached or removed. 340 * <p> 341 * The order of the fragments in the list is the order in which they were 342 * added or attached. 343 * 344 * @return A list of all fragments that are added to the FragmentManager. 345 */ 346 public abstract List<Fragment> getFragments(); 347 348 /** 349 * Save the current instance state of the given Fragment. This can be 350 * used later when creating a new instance of the Fragment and adding 351 * it to the fragment manager, to have it create itself to match the 352 * current state returned here. Note that there are limits on how 353 * this can be used: 354 * 355 * <ul> 356 * <li>The Fragment must currently be attached to the FragmentManager. 357 * <li>A new Fragment created using this saved state must be the same class 358 * type as the Fragment it was created from. 359 * <li>The saved state can not contain dependencies on other fragments -- 360 * that is it can't use {@link #putFragment(Bundle, String, Fragment)} to 361 * store a fragment reference because that reference may not be valid when 362 * this saved state is later used. Likewise the Fragment's target and 363 * result code are not included in this state. 364 * </ul> 365 * 366 * @param f The Fragment whose state is to be saved. 367 * @return The generated state. This will be null if there was no 368 * interesting state created by the fragment. 369 */ 370 public abstract Fragment.SavedState saveFragmentInstanceState(Fragment f); 371 372 /** 373 * Returns true if the final {@link android.app.Activity#onDestroy() Activity.onDestroy()} 374 * call has been made on the FragmentManager's Activity, so this instance is now dead. 375 */ 376 public abstract boolean isDestroyed(); 377 378 /** 379 * Registers a {@link FragmentLifecycleCallbacks} to listen to fragment lifecycle events 380 * happening in this FragmentManager. All registered callbacks will be automatically 381 * unregistered when this FragmentManager is destroyed. 382 * 383 * @param cb Callbacks to register 384 * @param recursive true to automatically register this callback for all child FragmentManagers 385 */ 386 public abstract void registerFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb, 387 boolean recursive); 388 389 /** 390 * Unregisters a previously registered {@link FragmentLifecycleCallbacks}. If the callback 391 * was not previously registered this call has no effect. All registered callbacks will be 392 * automatically unregistered when this FragmentManager is destroyed. 393 * 394 * @param cb Callbacks to unregister 395 */ 396 public abstract void unregisterFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb); 397 398 /** 399 * Return the currently active primary navigation fragment for this FragmentManager. 400 * The primary navigation fragment is set by fragment transactions using 401 * {@link FragmentTransaction#setPrimaryNavigationFragment(Fragment)}. 402 * 403 * <p>The primary navigation fragment's 404 * {@link Fragment#getChildFragmentManager() child FragmentManager} will be called first 405 * to process delegated navigation actions such as {@link #popBackStack()} if no ID 406 * or transaction name is provided to pop to.</p> 407 * 408 * @return the fragment designated as the primary navigation fragment 409 */ 410 public abstract Fragment getPrimaryNavigationFragment(); 411 412 /** 413 * Print the FragmentManager's state into the given stream. 414 * 415 * @param prefix Text to print at the front of each line. 416 * @param fd The raw file descriptor that the dump is being sent to. 417 * @param writer A PrintWriter to which the dump is to be set. 418 * @param args Additional arguments to the dump request. 419 */ 420 public abstract void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args); 421 422 /** 423 * Control whether the framework's internal fragment manager debugging 424 * logs are turned on. If enabled, you will see output in logcat as 425 * the framework performs fragment operations. 426 */ 427 public static void enableDebugLogging(boolean enabled) { 428 FragmentManagerImpl.DEBUG = enabled; 429 } 430 431 /** 432 * Returns {@code true} if the FragmentManager's state has already been saved 433 * by its host. Any operations that would change saved state should not be performed 434 * if this method returns true. For example, any popBackStack() method, such as 435 * {@link #popBackStackImmediate()} or any FragmentTransaction using 436 * {@link FragmentTransaction#commit()} instead of 437 * {@link FragmentTransaction#commitAllowingStateLoss()} will change 438 * the state and will result in an error. 439 * 440 * @return true if this FragmentManager's state has already been saved by its host 441 */ 442 public abstract boolean isStateSaved(); 443 444 /** 445 * Callback interface for listening to fragment state changes that happen 446 * within a given FragmentManager. 447 */ 448 public abstract static class FragmentLifecycleCallbacks { 449 /** 450 * Called right before the fragment's {@link Fragment#onAttach(Context)} method is called. 451 * This is a good time to inject any required dependencies or perform other configuration 452 * for the fragment before any of the fragment's lifecycle methods are invoked. 453 * 454 * @param fm Host FragmentManager 455 * @param f Fragment changing state 456 * @param context Context that the Fragment is being attached to 457 */ 458 public void onFragmentPreAttached(FragmentManager fm, Fragment f, Context context) {} 459 460 /** 461 * Called after the fragment has been attached to its host. Its host will have had 462 * <code>onAttachFragment</code> called before this call happens. 463 * 464 * @param fm Host FragmentManager 465 * @param f Fragment changing state 466 * @param context Context that the Fragment was attached to 467 */ 468 public void onFragmentAttached(FragmentManager fm, Fragment f, Context context) {} 469 470 /** 471 * Called right before the fragment's {@link Fragment#onCreate(Bundle)} method is called. 472 * This is a good time to inject any required dependencies or perform other configuration 473 * for the fragment. 474 * 475 * @param fm Host FragmentManager 476 * @param f Fragment changing state 477 * @param savedInstanceState Saved instance bundle from a previous instance 478 */ 479 public void onFragmentPreCreated(FragmentManager fm, Fragment f, 480 Bundle savedInstanceState) {} 481 482 /** 483 * Called after the fragment has returned from the FragmentManager's call to 484 * {@link Fragment#onCreate(Bundle)}. This will only happen once for any given 485 * fragment instance, though the fragment may be attached and detached multiple times. 486 * 487 * @param fm Host FragmentManager 488 * @param f Fragment changing state 489 * @param savedInstanceState Saved instance bundle from a previous instance 490 */ 491 public void onFragmentCreated(FragmentManager fm, Fragment f, Bundle savedInstanceState) {} 492 493 /** 494 * Called after the fragment has returned from the FragmentManager's call to 495 * {@link Fragment#onActivityCreated(Bundle)}. This will only happen once for any given 496 * fragment instance, though the fragment may be attached and detached multiple times. 497 * 498 * @param fm Host FragmentManager 499 * @param f Fragment changing state 500 * @param savedInstanceState Saved instance bundle from a previous instance 501 */ 502 public void onFragmentActivityCreated(FragmentManager fm, Fragment f, 503 Bundle savedInstanceState) {} 504 505 /** 506 * Called after the fragment has returned a non-null view from the FragmentManager's 507 * request to {@link Fragment#onCreateView(LayoutInflater, ViewGroup, Bundle)}. 508 * 509 * @param fm Host FragmentManager 510 * @param f Fragment that created and owns the view 511 * @param v View returned by the fragment 512 * @param savedInstanceState Saved instance bundle from a previous instance 513 */ 514 public void onFragmentViewCreated(FragmentManager fm, Fragment f, View v, 515 Bundle savedInstanceState) {} 516 517 /** 518 * Called after the fragment has returned from the FragmentManager's call to 519 * {@link Fragment#onStart()}. 520 * 521 * @param fm Host FragmentManager 522 * @param f Fragment changing state 523 */ 524 public void onFragmentStarted(FragmentManager fm, Fragment f) {} 525 526 /** 527 * Called after the fragment has returned from the FragmentManager's call to 528 * {@link Fragment#onResume()}. 529 * 530 * @param fm Host FragmentManager 531 * @param f Fragment changing state 532 */ 533 public void onFragmentResumed(FragmentManager fm, Fragment f) {} 534 535 /** 536 * Called after the fragment has returned from the FragmentManager's call to 537 * {@link Fragment#onPause()}. 538 * 539 * @param fm Host FragmentManager 540 * @param f Fragment changing state 541 */ 542 public void onFragmentPaused(FragmentManager fm, Fragment f) {} 543 544 /** 545 * Called after the fragment has returned from the FragmentManager's call to 546 * {@link Fragment#onStop()}. 547 * 548 * @param fm Host FragmentManager 549 * @param f Fragment changing state 550 */ 551 public void onFragmentStopped(FragmentManager fm, Fragment f) {} 552 553 /** 554 * Called after the fragment has returned from the FragmentManager's call to 555 * {@link Fragment#onSaveInstanceState(Bundle)}. 556 * 557 * @param fm Host FragmentManager 558 * @param f Fragment changing state 559 * @param outState Saved state bundle for the fragment 560 */ 561 public void onFragmentSaveInstanceState(FragmentManager fm, Fragment f, Bundle outState) {} 562 563 /** 564 * Called after the fragment has returned from the FragmentManager's call to 565 * {@link Fragment#onDestroyView()}. 566 * 567 * @param fm Host FragmentManager 568 * @param f Fragment changing state 569 */ 570 public void onFragmentViewDestroyed(FragmentManager fm, Fragment f) {} 571 572 /** 573 * Called after the fragment has returned from the FragmentManager's call to 574 * {@link Fragment#onDestroy()}. 575 * 576 * @param fm Host FragmentManager 577 * @param f Fragment changing state 578 */ 579 public void onFragmentDestroyed(FragmentManager fm, Fragment f) {} 580 581 /** 582 * Called after the fragment has returned from the FragmentManager's call to 583 * {@link Fragment#onDetach()}. 584 * 585 * @param fm Host FragmentManager 586 * @param f Fragment changing state 587 */ 588 public void onFragmentDetached(FragmentManager fm, Fragment f) {} 589 } 590} 591 592final class FragmentManagerState implements Parcelable { 593 FragmentState[] mActive; 594 int[] mAdded; 595 BackStackState[] mBackStack; 596 int mPrimaryNavActiveIndex = -1; 597 int mNextFragmentIndex; 598 599 public FragmentManagerState() { 600 } 601 602 public FragmentManagerState(Parcel in) { 603 mActive = in.createTypedArray(FragmentState.CREATOR); 604 mAdded = in.createIntArray(); 605 mBackStack = in.createTypedArray(BackStackState.CREATOR); 606 mPrimaryNavActiveIndex = in.readInt(); 607 mNextFragmentIndex = in.readInt(); 608 } 609 610 @Override 611 public int describeContents() { 612 return 0; 613 } 614 615 @Override 616 public void writeToParcel(Parcel dest, int flags) { 617 dest.writeTypedArray(mActive, flags); 618 dest.writeIntArray(mAdded); 619 dest.writeTypedArray(mBackStack, flags); 620 dest.writeInt(mPrimaryNavActiveIndex); 621 dest.writeInt(mNextFragmentIndex); 622 } 623 624 public static final Parcelable.Creator<FragmentManagerState> CREATOR 625 = new Parcelable.Creator<FragmentManagerState>() { 626 @Override 627 public FragmentManagerState createFromParcel(Parcel in) { 628 return new FragmentManagerState(in); 629 } 630 631 @Override 632 public FragmentManagerState[] newArray(int size) { 633 return new FragmentManagerState[size]; 634 } 635 }; 636} 637 638/** 639 * Container for fragments associated with an activity. 640 */ 641final class FragmentManagerImpl extends FragmentManager implements LayoutInflater.Factory2 { 642 static boolean DEBUG = false; 643 static final String TAG = "FragmentManager"; 644 645 static final String TARGET_REQUEST_CODE_STATE_TAG = "android:target_req_state"; 646 static final String TARGET_STATE_TAG = "android:target_state"; 647 static final String VIEW_STATE_TAG = "android:view_state"; 648 static final String USER_VISIBLE_HINT_TAG = "android:user_visible_hint"; 649 650 ArrayList<OpGenerator> mPendingActions; 651 boolean mExecutingActions; 652 653 int mNextFragmentIndex = 0; 654 655 final ArrayList<Fragment> mAdded = new ArrayList<>(); 656 SparseArray<Fragment> mActive; 657 ArrayList<BackStackRecord> mBackStack; 658 ArrayList<Fragment> mCreatedMenus; 659 660 // Must be accessed while locked. 661 ArrayList<BackStackRecord> mBackStackIndices; 662 ArrayList<Integer> mAvailBackStackIndices; 663 664 ArrayList<OnBackStackChangedListener> mBackStackChangeListeners; 665 private final CopyOnWriteArrayList<Pair<FragmentLifecycleCallbacks, Boolean>> 666 mLifecycleCallbacks = new CopyOnWriteArrayList<>(); 667 668 int mCurState = Fragment.INITIALIZING; 669 FragmentHostCallback mHost; 670 FragmentContainer mContainer; 671 Fragment mParent; 672 Fragment mPrimaryNav; 673 674 static Field sAnimationListenerField = null; 675 676 boolean mNeedMenuInvalidate; 677 boolean mStateSaved; 678 boolean mDestroyed; 679 String mNoTransactionsBecause; 680 boolean mHavePendingDeferredStart; 681 682 // Temporary vars for removing redundant operations in BackStackRecords: 683 ArrayList<BackStackRecord> mTmpRecords; 684 ArrayList<Boolean> mTmpIsPop; 685 ArrayList<Fragment> mTmpAddedFragments; 686 687 // Temporary vars for state save and restore. 688 Bundle mStateBundle = null; 689 SparseArray<Parcelable> mStateArray = null; 690 691 // Postponed transactions. 692 ArrayList<StartEnterTransitionListener> mPostponedTransactions; 693 694 // Saved FragmentManagerNonConfig during saveAllState() and cleared in noteStateNotSaved() 695 FragmentManagerNonConfig mSavedNonConfig; 696 697 Runnable mExecCommit = new Runnable() { 698 @Override 699 public void run() { 700 execPendingActions(); 701 } 702 }; 703 704 static boolean modifiesAlpha(AnimationOrAnimator anim) { 705 if (anim.animation instanceof AlphaAnimation) { 706 return true; 707 } else if (anim.animation instanceof AnimationSet) { 708 List<Animation> anims = ((AnimationSet) anim.animation).getAnimations(); 709 for (int i = 0; i < anims.size(); i++) { 710 if (anims.get(i) instanceof AlphaAnimation) { 711 return true; 712 } 713 } 714 return false; 715 } else { 716 return modifiesAlpha(anim.animator); 717 } 718 } 719 720 static boolean modifiesAlpha(Animator anim) { 721 if (anim == null) { 722 return false; 723 } 724 if (anim instanceof ValueAnimator) { 725 ValueAnimator valueAnim = (ValueAnimator) anim; 726 PropertyValuesHolder[] values = valueAnim.getValues(); 727 for (int i = 0; i < values.length; i++) { 728 if (("alpha").equals(values[i].getPropertyName())) { 729 return true; 730 } 731 } 732 } else if (anim instanceof AnimatorSet) { 733 List<Animator> animList = ((AnimatorSet) anim).getChildAnimations(); 734 for (int i = 0; i < animList.size(); i++) { 735 if (modifiesAlpha(animList.get(i))) { 736 return true; 737 } 738 } 739 } 740 return false; 741 } 742 743 static boolean shouldRunOnHWLayer(View v, AnimationOrAnimator anim) { 744 if (v == null || anim == null) { 745 return false; 746 } 747 return Build.VERSION.SDK_INT >= 19 748 && v.getLayerType() == View.LAYER_TYPE_NONE 749 && ViewCompat.hasOverlappingRendering(v) 750 && modifiesAlpha(anim); 751 } 752 753 private void throwException(RuntimeException ex) { 754 Log.e(TAG, ex.getMessage()); 755 Log.e(TAG, "Activity state:"); 756 LogWriter logw = new LogWriter(TAG); 757 PrintWriter pw = new PrintWriter(logw); 758 if (mHost != null) { 759 try { 760 mHost.onDump(" ", null, pw, new String[] { }); 761 } catch (Exception e) { 762 Log.e(TAG, "Failed dumping state", e); 763 } 764 } else { 765 try { 766 dump(" ", null, pw, new String[] { }); 767 } catch (Exception e) { 768 Log.e(TAG, "Failed dumping state", e); 769 } 770 } 771 throw ex; 772 } 773 774 @Override 775 public FragmentTransaction beginTransaction() { 776 return new BackStackRecord(this); 777 } 778 779 @Override 780 public boolean executePendingTransactions() { 781 boolean updates = execPendingActions(); 782 forcePostponedTransactions(); 783 return updates; 784 } 785 786 @Override 787 public void popBackStack() { 788 enqueueAction(new PopBackStackState(null, -1, 0), false); 789 } 790 791 @Override 792 public boolean popBackStackImmediate() { 793 checkStateLoss(); 794 return popBackStackImmediate(null, -1, 0); 795 } 796 797 @Override 798 public void popBackStack(final String name, final int flags) { 799 enqueueAction(new PopBackStackState(name, -1, flags), false); 800 } 801 802 @Override 803 public boolean popBackStackImmediate(String name, int flags) { 804 checkStateLoss(); 805 return popBackStackImmediate(name, -1, flags); 806 } 807 808 @Override 809 public void popBackStack(final int id, final int flags) { 810 if (id < 0) { 811 throw new IllegalArgumentException("Bad id: " + id); 812 } 813 enqueueAction(new PopBackStackState(null, id, flags), false); 814 } 815 816 @Override 817 public boolean popBackStackImmediate(int id, int flags) { 818 checkStateLoss(); 819 execPendingActions(); 820 if (id < 0) { 821 throw new IllegalArgumentException("Bad id: " + id); 822 } 823 return popBackStackImmediate(null, id, flags); 824 } 825 826 /** 827 * Used by all public popBackStackImmediate methods, this executes pending transactions and 828 * returns true if the pop action did anything, regardless of what other pending 829 * transactions did. 830 * 831 * @return true if the pop operation did anything or false otherwise. 832 */ 833 private boolean popBackStackImmediate(String name, int id, int flags) { 834 execPendingActions(); 835 ensureExecReady(true); 836 837 if (mPrimaryNav != null // We have a primary nav fragment 838 && id < 0 // No valid id (since they're local) 839 && name == null) { // no name to pop to (since they're local) 840 final FragmentManager childManager = mPrimaryNav.peekChildFragmentManager(); 841 if (childManager != null && childManager.popBackStackImmediate()) { 842 // We did something, just not to this specific FragmentManager. Return true. 843 return true; 844 } 845 } 846 847 boolean executePop = popBackStackState(mTmpRecords, mTmpIsPop, name, id, flags); 848 if (executePop) { 849 mExecutingActions = true; 850 try { 851 removeRedundantOperationsAndExecute(mTmpRecords, mTmpIsPop); 852 } finally { 853 cleanupExec(); 854 } 855 } 856 857 doPendingDeferredStart(); 858 burpActive(); 859 return executePop; 860 } 861 862 @Override 863 public int getBackStackEntryCount() { 864 return mBackStack != null ? mBackStack.size() : 0; 865 } 866 867 @Override 868 public BackStackEntry getBackStackEntryAt(int index) { 869 return mBackStack.get(index); 870 } 871 872 @Override 873 public void addOnBackStackChangedListener(OnBackStackChangedListener listener) { 874 if (mBackStackChangeListeners == null) { 875 mBackStackChangeListeners = new ArrayList<OnBackStackChangedListener>(); 876 } 877 mBackStackChangeListeners.add(listener); 878 } 879 880 @Override 881 public void removeOnBackStackChangedListener(OnBackStackChangedListener listener) { 882 if (mBackStackChangeListeners != null) { 883 mBackStackChangeListeners.remove(listener); 884 } 885 } 886 887 @Override 888 public void putFragment(Bundle bundle, String key, Fragment fragment) { 889 if (fragment.mIndex < 0) { 890 throwException(new IllegalStateException("Fragment " + fragment 891 + " is not currently in the FragmentManager")); 892 } 893 bundle.putInt(key, fragment.mIndex); 894 } 895 896 @Override 897 public Fragment getFragment(Bundle bundle, String key) { 898 int index = bundle.getInt(key, -1); 899 if (index == -1) { 900 return null; 901 } 902 Fragment f = mActive.get(index); 903 if (f == null) { 904 throwException(new IllegalStateException("Fragment no longer exists for key " 905 + key + ": index " + index)); 906 } 907 return f; 908 } 909 910 @Override 911 public List<Fragment> getFragments() { 912 if (mAdded.isEmpty()) { 913 return Collections.EMPTY_LIST; 914 } 915 synchronized (mAdded) { 916 return (List<Fragment>) mAdded.clone(); 917 } 918 } 919 920 /** 921 * This is used by FragmentController to get the Active fragments. 922 * 923 * @return A list of active fragments in the fragment manager, including those that are in the 924 * back stack. 925 */ 926 List<Fragment> getActiveFragments() { 927 if (mActive == null) { 928 return null; 929 } 930 final int count = mActive.size(); 931 ArrayList<Fragment> fragments = new ArrayList<>(count); 932 for (int i = 0; i < count; i++) { 933 fragments.add(mActive.valueAt(i)); 934 } 935 return fragments; 936 } 937 938 /** 939 * Used by FragmentController to get the number of Active Fragments. 940 * 941 * @return The number of active fragments. 942 */ 943 int getActiveFragmentCount() { 944 if (mActive == null) { 945 return 0; 946 } 947 return mActive.size(); 948 } 949 950 @Override 951 public Fragment.SavedState saveFragmentInstanceState(Fragment fragment) { 952 if (fragment.mIndex < 0) { 953 throwException( new IllegalStateException("Fragment " + fragment 954 + " is not currently in the FragmentManager")); 955 } 956 if (fragment.mState > Fragment.INITIALIZING) { 957 Bundle result = saveFragmentBasicState(fragment); 958 return result != null ? new Fragment.SavedState(result) : null; 959 } 960 return null; 961 } 962 963 @Override 964 public boolean isDestroyed() { 965 return mDestroyed; 966 } 967 968 @Override 969 public String toString() { 970 StringBuilder sb = new StringBuilder(128); 971 sb.append("FragmentManager{"); 972 sb.append(Integer.toHexString(System.identityHashCode(this))); 973 sb.append(" in "); 974 if (mParent != null) { 975 DebugUtils.buildShortClassTag(mParent, sb); 976 } else { 977 DebugUtils.buildShortClassTag(mHost, sb); 978 } 979 sb.append("}}"); 980 return sb.toString(); 981 } 982 983 @Override 984 public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) { 985 String innerPrefix = prefix + " "; 986 987 int N; 988 if (mActive != null) { 989 N = mActive.size(); 990 if (N > 0) { 991 writer.print(prefix); writer.print("Active Fragments in "); 992 writer.print(Integer.toHexString(System.identityHashCode(this))); 993 writer.println(":"); 994 for (int i=0; i<N; i++) { 995 Fragment f = mActive.valueAt(i); 996 writer.print(prefix); writer.print(" #"); writer.print(i); 997 writer.print(": "); writer.println(f); 998 if (f != null) { 999 f.dump(innerPrefix, fd, writer, args); 1000 } 1001 } 1002 } 1003 } 1004 1005 N = mAdded.size(); 1006 if (N > 0) { 1007 writer.print(prefix); writer.println("Added Fragments:"); 1008 for (int i = 0; i < N; i++) { 1009 Fragment f = mAdded.get(i); 1010 writer.print(prefix); 1011 writer.print(" #"); 1012 writer.print(i); 1013 writer.print(": "); 1014 writer.println(f.toString()); 1015 } 1016 } 1017 1018 if (mCreatedMenus != null) { 1019 N = mCreatedMenus.size(); 1020 if (N > 0) { 1021 writer.print(prefix); writer.println("Fragments Created Menus:"); 1022 for (int i=0; i<N; i++) { 1023 Fragment f = mCreatedMenus.get(i); 1024 writer.print(prefix); writer.print(" #"); writer.print(i); 1025 writer.print(": "); writer.println(f.toString()); 1026 } 1027 } 1028 } 1029 1030 if (mBackStack != null) { 1031 N = mBackStack.size(); 1032 if (N > 0) { 1033 writer.print(prefix); writer.println("Back Stack:"); 1034 for (int i=0; i<N; i++) { 1035 BackStackRecord bs = mBackStack.get(i); 1036 writer.print(prefix); writer.print(" #"); writer.print(i); 1037 writer.print(": "); writer.println(bs.toString()); 1038 bs.dump(innerPrefix, fd, writer, args); 1039 } 1040 } 1041 } 1042 1043 synchronized (this) { 1044 if (mBackStackIndices != null) { 1045 N = mBackStackIndices.size(); 1046 if (N > 0) { 1047 writer.print(prefix); writer.println("Back Stack Indices:"); 1048 for (int i=0; i<N; i++) { 1049 BackStackRecord bs = mBackStackIndices.get(i); 1050 writer.print(prefix); writer.print(" #"); writer.print(i); 1051 writer.print(": "); writer.println(bs); 1052 } 1053 } 1054 } 1055 1056 if (mAvailBackStackIndices != null && mAvailBackStackIndices.size() > 0) { 1057 writer.print(prefix); writer.print("mAvailBackStackIndices: "); 1058 writer.println(Arrays.toString(mAvailBackStackIndices.toArray())); 1059 } 1060 } 1061 1062 if (mPendingActions != null) { 1063 N = mPendingActions.size(); 1064 if (N > 0) { 1065 writer.print(prefix); writer.println("Pending Actions:"); 1066 for (int i=0; i<N; i++) { 1067 OpGenerator r = mPendingActions.get(i); 1068 writer.print(prefix); writer.print(" #"); writer.print(i); 1069 writer.print(": "); writer.println(r); 1070 } 1071 } 1072 } 1073 1074 writer.print(prefix); writer.println("FragmentManager misc state:"); 1075 writer.print(prefix); writer.print(" mHost="); writer.println(mHost); 1076 writer.print(prefix); writer.print(" mContainer="); writer.println(mContainer); 1077 if (mParent != null) { 1078 writer.print(prefix); writer.print(" mParent="); writer.println(mParent); 1079 } 1080 writer.print(prefix); writer.print(" mCurState="); writer.print(mCurState); 1081 writer.print(" mStateSaved="); writer.print(mStateSaved); 1082 writer.print(" mDestroyed="); writer.println(mDestroyed); 1083 if (mNeedMenuInvalidate) { 1084 writer.print(prefix); writer.print(" mNeedMenuInvalidate="); 1085 writer.println(mNeedMenuInvalidate); 1086 } 1087 if (mNoTransactionsBecause != null) { 1088 writer.print(prefix); writer.print(" mNoTransactionsBecause="); 1089 writer.println(mNoTransactionsBecause); 1090 } 1091 } 1092 1093 static final Interpolator DECELERATE_QUINT = new DecelerateInterpolator(2.5f); 1094 static final Interpolator DECELERATE_CUBIC = new DecelerateInterpolator(1.5f); 1095 static final Interpolator ACCELERATE_QUINT = new AccelerateInterpolator(2.5f); 1096 static final Interpolator ACCELERATE_CUBIC = new AccelerateInterpolator(1.5f); 1097 1098 static final int ANIM_DUR = 220; 1099 1100 static AnimationOrAnimator makeOpenCloseAnimation(Context context, float startScale, 1101 float endScale, float startAlpha, float endAlpha) { 1102 AnimationSet set = new AnimationSet(false); 1103 ScaleAnimation scale = new ScaleAnimation(startScale, endScale, startScale, endScale, 1104 Animation.RELATIVE_TO_SELF, .5f, Animation.RELATIVE_TO_SELF, .5f); 1105 scale.setInterpolator(DECELERATE_QUINT); 1106 scale.setDuration(ANIM_DUR); 1107 set.addAnimation(scale); 1108 AlphaAnimation alpha = new AlphaAnimation(startAlpha, endAlpha); 1109 alpha.setInterpolator(DECELERATE_CUBIC); 1110 alpha.setDuration(ANIM_DUR); 1111 set.addAnimation(alpha); 1112 return new AnimationOrAnimator(set); 1113 } 1114 1115 static AnimationOrAnimator makeFadeAnimation(Context context, float start, float end) { 1116 AlphaAnimation anim = new AlphaAnimation(start, end); 1117 anim.setInterpolator(DECELERATE_CUBIC); 1118 anim.setDuration(ANIM_DUR); 1119 return new AnimationOrAnimator(anim); 1120 } 1121 1122 AnimationOrAnimator loadAnimation(Fragment fragment, int transit, boolean enter, 1123 int transitionStyle) { 1124 int nextAnim = fragment.getNextAnim(); 1125 Animation animation = fragment.onCreateAnimation(transit, enter, nextAnim); 1126 if (animation != null) { 1127 return new AnimationOrAnimator(animation); 1128 } 1129 1130 Animator animator = fragment.onCreateAnimator(transit, enter, nextAnim); 1131 if (animator != null) { 1132 return new AnimationOrAnimator(animator); 1133 } 1134 1135 if (nextAnim != 0) { 1136 String dir = mHost.getContext().getResources().getResourceTypeName(nextAnim); 1137 boolean isAnim = "anim".equals(dir); 1138 boolean successfulLoad = false; 1139 if (isAnim) { 1140 // try AnimationUtils first 1141 try { 1142 animation = AnimationUtils.loadAnimation(mHost.getContext(), nextAnim); 1143 if (animation != null) { 1144 return new AnimationOrAnimator(animation); 1145 } 1146 // A null animation may be returned and that is acceptable 1147 successfulLoad = true; // succeeded in loading animation, but it is null 1148 } catch (NotFoundException e) { 1149 throw e; // Rethrow it -- the resource should be found if it is provided. 1150 } catch (RuntimeException e) { 1151 // Other exceptions can occur when loading an Animator from AnimationUtils. 1152 } 1153 } 1154 if (!successfulLoad) { 1155 // try Animator 1156 try { 1157 animator = AnimatorInflater.loadAnimator(mHost.getContext(), nextAnim); 1158 if (animator != null) { 1159 return new AnimationOrAnimator(animator); 1160 } 1161 } catch (RuntimeException e) { 1162 if (isAnim) { 1163 // Rethrow it -- we already tried AnimationUtils and it failed. 1164 throw e; 1165 } 1166 // Otherwise, it is probably an animation resource 1167 animation = AnimationUtils.loadAnimation(mHost.getContext(), nextAnim); 1168 if (animation != null) { 1169 return new AnimationOrAnimator(animation); 1170 } 1171 } 1172 } 1173 } 1174 1175 if (transit == 0) { 1176 return null; 1177 } 1178 1179 int styleIndex = transitToStyleIndex(transit, enter); 1180 if (styleIndex < 0) { 1181 return null; 1182 } 1183 1184 switch (styleIndex) { 1185 case ANIM_STYLE_OPEN_ENTER: 1186 return makeOpenCloseAnimation(mHost.getContext(), 1.125f, 1.0f, 0, 1); 1187 case ANIM_STYLE_OPEN_EXIT: 1188 return makeOpenCloseAnimation(mHost.getContext(), 1.0f, .975f, 1, 0); 1189 case ANIM_STYLE_CLOSE_ENTER: 1190 return makeOpenCloseAnimation(mHost.getContext(), .975f, 1.0f, 0, 1); 1191 case ANIM_STYLE_CLOSE_EXIT: 1192 return makeOpenCloseAnimation(mHost.getContext(), 1.0f, 1.075f, 1, 0); 1193 case ANIM_STYLE_FADE_ENTER: 1194 return makeFadeAnimation(mHost.getContext(), 0, 1); 1195 case ANIM_STYLE_FADE_EXIT: 1196 return makeFadeAnimation(mHost.getContext(), 1, 0); 1197 } 1198 1199 // TODO: remove or fix transitionStyle -- it apparently never worked. 1200 if (transitionStyle == 0 && mHost.onHasWindowAnimations()) { 1201 transitionStyle = mHost.onGetWindowAnimations(); 1202 } 1203 if (transitionStyle == 0) { 1204 return null; 1205 } 1206 1207 //TypedArray attrs = mActivity.obtainStyledAttributes(transitionStyle, 1208 // com.android.internal.R.styleable.FragmentAnimation); 1209 //int anim = attrs.getResourceId(styleIndex, 0); 1210 //attrs.recycle(); 1211 1212 //if (anim == 0) { 1213 // return null; 1214 //} 1215 1216 //return AnimatorInflater.loadAnimator(mActivity, anim); 1217 return null; 1218 } 1219 1220 public void performPendingDeferredStart(Fragment f) { 1221 if (f.mDeferStart) { 1222 if (mExecutingActions) { 1223 // Wait until we're done executing our pending transactions 1224 mHavePendingDeferredStart = true; 1225 return; 1226 } 1227 f.mDeferStart = false; 1228 moveToState(f, mCurState, 0, 0, false); 1229 } 1230 } 1231 1232 /** 1233 * Sets the to be animated view on hardware layer during the animation. Note 1234 * that calling this will replace any existing animation listener on the animation 1235 * with a new one, as animations do not support more than one listeners. Therefore, 1236 * animations that already have listeners should do the layer change operations 1237 * in their existing listeners, rather than calling this function. 1238 */ 1239 private static void setHWLayerAnimListenerIfAlpha(final View v, AnimationOrAnimator anim) { 1240 if (v == null || anim == null) { 1241 return; 1242 } 1243 if (shouldRunOnHWLayer(v, anim)) { 1244 if (anim.animator != null) { 1245 anim.animator.addListener(new AnimatorOnHWLayerIfNeededListener(v)); 1246 } else { 1247 AnimationListener originalListener = getAnimationListener(anim.animation); 1248 // If there's already a listener set on the animation, we need wrap the new listener 1249 // around the existing listener, so that they will both get animation listener 1250 // callbacks. 1251 v.setLayerType(View.LAYER_TYPE_HARDWARE, null); 1252 anim.animation.setAnimationListener(new AnimateOnHWLayerIfNeededListener(v, 1253 originalListener)); 1254 } 1255 } 1256 } 1257 1258 /** 1259 * Returns an existing AnimationListener on an Animation or {@code null} if none exists. 1260 */ 1261 private static AnimationListener getAnimationListener(Animation animation) { 1262 AnimationListener originalListener = null; 1263 try { 1264 if (sAnimationListenerField == null) { 1265 sAnimationListenerField = Animation.class.getDeclaredField("mListener"); 1266 sAnimationListenerField.setAccessible(true); 1267 } 1268 originalListener = (AnimationListener) sAnimationListenerField.get(animation); 1269 } catch (NoSuchFieldException e) { 1270 Log.e(TAG, "No field with the name mListener is found in Animation class", e); 1271 } catch (IllegalAccessException e) { 1272 Log.e(TAG, "Cannot access Animation's mListener field", e); 1273 } 1274 return originalListener; 1275 } 1276 1277 boolean isStateAtLeast(int state) { 1278 return mCurState >= state; 1279 } 1280 1281 @SuppressWarnings("ReferenceEquality") 1282 void moveToState(Fragment f, int newState, int transit, int transitionStyle, 1283 boolean keepActive) { 1284 // Fragments that are not currently added will sit in the onCreate() state. 1285 if ((!f.mAdded || f.mDetached) && newState > Fragment.CREATED) { 1286 newState = Fragment.CREATED; 1287 } 1288 if (f.mRemoving && newState > f.mState) { 1289 if (f.mState == Fragment.INITIALIZING && f.isInBackStack()) { 1290 // Allow the fragment to be created so that it can be saved later. 1291 newState = Fragment.CREATED; 1292 } else { 1293 // While removing a fragment, we can't change it to a higher state. 1294 newState = f.mState; 1295 } 1296 } 1297 // Defer start if requested; don't allow it to move to STARTED or higher 1298 // if it's not already started. 1299 if (f.mDeferStart && f.mState < Fragment.STARTED && newState > Fragment.STOPPED) { 1300 newState = Fragment.STOPPED; 1301 } 1302 if (f.mState <= newState) { 1303 // For fragments that are created from a layout, when restoring from 1304 // state we don't want to allow them to be created until they are 1305 // being reloaded from the layout. 1306 if (f.mFromLayout && !f.mInLayout) { 1307 return; 1308 } 1309 if (f.getAnimatingAway() != null || f.getAnimator() != null) { 1310 // The fragment is currently being animated... but! Now we 1311 // want to move our state back up. Give up on waiting for the 1312 // animation, move to whatever the final state should be once 1313 // the animation is done, and then we can proceed from there. 1314 f.setAnimatingAway(null); 1315 f.setAnimator(null); 1316 moveToState(f, f.getStateAfterAnimating(), 0, 0, true); 1317 } 1318 switch (f.mState) { 1319 case Fragment.INITIALIZING: 1320 if (newState > Fragment.INITIALIZING) { 1321 if (DEBUG) Log.v(TAG, "moveto CREATED: " + f); 1322 if (f.mSavedFragmentState != null) { 1323 f.mSavedFragmentState.setClassLoader(mHost.getContext() 1324 .getClassLoader()); 1325 f.mSavedViewState = f.mSavedFragmentState.getSparseParcelableArray( 1326 FragmentManagerImpl.VIEW_STATE_TAG); 1327 f.mTarget = getFragment(f.mSavedFragmentState, 1328 FragmentManagerImpl.TARGET_STATE_TAG); 1329 if (f.mTarget != null) { 1330 f.mTargetRequestCode = f.mSavedFragmentState.getInt( 1331 FragmentManagerImpl.TARGET_REQUEST_CODE_STATE_TAG, 0); 1332 } 1333 f.mUserVisibleHint = f.mSavedFragmentState.getBoolean( 1334 FragmentManagerImpl.USER_VISIBLE_HINT_TAG, true); 1335 if (!f.mUserVisibleHint) { 1336 f.mDeferStart = true; 1337 if (newState > Fragment.STOPPED) { 1338 newState = Fragment.STOPPED; 1339 } 1340 } 1341 } 1342 1343 f.mHost = mHost; 1344 f.mParentFragment = mParent; 1345 f.mFragmentManager = mParent != null 1346 ? mParent.mChildFragmentManager : mHost.getFragmentManagerImpl(); 1347 1348 // If we have a target fragment, push it along to at least CREATED 1349 // so that this one can rely on it as an initialized dependency. 1350 if (f.mTarget != null) { 1351 if (mActive.get(f.mTarget.mIndex) != f.mTarget) { 1352 throw new IllegalStateException("Fragment " + f 1353 + " declared target fragment " + f.mTarget 1354 + " that does not belong to this FragmentManager!"); 1355 } 1356 if (f.mTarget.mState < Fragment.CREATED) { 1357 moveToState(f.mTarget, Fragment.CREATED, 0, 0, true); 1358 } 1359 } 1360 1361 dispatchOnFragmentPreAttached(f, mHost.getContext(), false); 1362 f.mCalled = false; 1363 f.onAttach(mHost.getContext()); 1364 if (!f.mCalled) { 1365 throw new SuperNotCalledException("Fragment " + f 1366 + " did not call through to super.onAttach()"); 1367 } 1368 if (f.mParentFragment == null) { 1369 mHost.onAttachFragment(f); 1370 } else { 1371 f.mParentFragment.onAttachFragment(f); 1372 } 1373 dispatchOnFragmentAttached(f, mHost.getContext(), false); 1374 1375 if (!f.mRetaining) { 1376 dispatchOnFragmentPreCreated(f, f.mSavedFragmentState, false); 1377 f.performCreate(f.mSavedFragmentState); 1378 dispatchOnFragmentCreated(f, f.mSavedFragmentState, false); 1379 } else { 1380 f.restoreChildFragmentState(f.mSavedFragmentState); 1381 f.mState = Fragment.CREATED; 1382 } 1383 f.mRetaining = false; 1384 } 1385 // fall through 1386 case Fragment.CREATED: 1387 // This is outside the if statement below on purpose; we want this to run 1388 // even if we do a moveToState from CREATED => *, CREATED => CREATED, and 1389 // * => CREATED as part of the case fallthrough above. 1390 ensureInflatedFragmentView(f); 1391 1392 if (newState > Fragment.CREATED) { 1393 if (DEBUG) Log.v(TAG, "moveto ACTIVITY_CREATED: " + f); 1394 if (!f.mFromLayout) { 1395 ViewGroup container = null; 1396 if (f.mContainerId != 0) { 1397 if (f.mContainerId == View.NO_ID) { 1398 throwException(new IllegalArgumentException( 1399 "Cannot create fragment " 1400 + f 1401 + " for a container view with no id")); 1402 } 1403 container = (ViewGroup) mContainer.onFindViewById(f.mContainerId); 1404 if (container == null && !f.mRestored) { 1405 String resName; 1406 try { 1407 resName = f.getResources().getResourceName(f.mContainerId); 1408 } catch (NotFoundException e) { 1409 resName = "unknown"; 1410 } 1411 throwException(new IllegalArgumentException( 1412 "No view found for id 0x" 1413 + Integer.toHexString(f.mContainerId) + " (" 1414 + resName 1415 + ") for fragment " + f)); 1416 } 1417 } 1418 f.mContainer = container; 1419 f.mView = f.performCreateView(f.performGetLayoutInflater( 1420 f.mSavedFragmentState), container, f.mSavedFragmentState); 1421 if (f.mView != null) { 1422 f.mInnerView = f.mView; 1423 f.mView.setSaveFromParentEnabled(false); 1424 if (container != null) { 1425 container.addView(f.mView); 1426 } 1427 if (f.mHidden) { 1428 f.mView.setVisibility(View.GONE); 1429 } 1430 f.onViewCreated(f.mView, f.mSavedFragmentState); 1431 dispatchOnFragmentViewCreated(f, f.mView, f.mSavedFragmentState, 1432 false); 1433 // Only animate the view if it is visible. This is done after 1434 // dispatchOnFragmentViewCreated in case visibility is changed 1435 f.mIsNewlyAdded = (f.mView.getVisibility() == View.VISIBLE) 1436 && f.mContainer != null; 1437 } else { 1438 f.mInnerView = null; 1439 } 1440 } 1441 1442 f.performActivityCreated(f.mSavedFragmentState); 1443 dispatchOnFragmentActivityCreated(f, f.mSavedFragmentState, false); 1444 if (f.mView != null) { 1445 f.restoreViewState(f.mSavedFragmentState); 1446 } 1447 f.mSavedFragmentState = null; 1448 } 1449 // fall through 1450 case Fragment.ACTIVITY_CREATED: 1451 if (newState > Fragment.ACTIVITY_CREATED) { 1452 f.mState = Fragment.STOPPED; 1453 } 1454 // fall through 1455 case Fragment.STOPPED: 1456 if (newState > Fragment.STOPPED) { 1457 if (DEBUG) Log.v(TAG, "moveto STARTED: " + f); 1458 f.performStart(); 1459 dispatchOnFragmentStarted(f, false); 1460 } 1461 // fall through 1462 case Fragment.STARTED: 1463 if (newState > Fragment.STARTED) { 1464 if (DEBUG) Log.v(TAG, "moveto RESUMED: " + f); 1465 f.performResume(); 1466 dispatchOnFragmentResumed(f, false); 1467 f.mSavedFragmentState = null; 1468 f.mSavedViewState = null; 1469 } 1470 } 1471 } else if (f.mState > newState) { 1472 switch (f.mState) { 1473 case Fragment.RESUMED: 1474 if (newState < Fragment.RESUMED) { 1475 if (DEBUG) Log.v(TAG, "movefrom RESUMED: " + f); 1476 f.performPause(); 1477 dispatchOnFragmentPaused(f, false); 1478 } 1479 // fall through 1480 case Fragment.STARTED: 1481 if (newState < Fragment.STARTED) { 1482 if (DEBUG) Log.v(TAG, "movefrom STARTED: " + f); 1483 f.performStop(); 1484 dispatchOnFragmentStopped(f, false); 1485 } 1486 // fall through 1487 case Fragment.STOPPED: 1488 if (newState < Fragment.STOPPED) { 1489 if (DEBUG) Log.v(TAG, "movefrom STOPPED: " + f); 1490 f.performReallyStop(); 1491 } 1492 // fall through 1493 case Fragment.ACTIVITY_CREATED: 1494 if (newState < Fragment.ACTIVITY_CREATED) { 1495 if (DEBUG) Log.v(TAG, "movefrom ACTIVITY_CREATED: " + f); 1496 if (f.mView != null) { 1497 // Need to save the current view state if not 1498 // done already. 1499 if (mHost.onShouldSaveFragmentState(f) && f.mSavedViewState == null) { 1500 saveFragmentViewState(f); 1501 } 1502 } 1503 f.performDestroyView(); 1504 dispatchOnFragmentViewDestroyed(f, false); 1505 if (f.mView != null && f.mContainer != null) { 1506 // Stop any current animations: 1507 f.mView.clearAnimation(); 1508 f.mContainer.endViewTransition(f.mView); 1509 AnimationOrAnimator anim = null; 1510 if (mCurState > Fragment.INITIALIZING && !mDestroyed 1511 && f.mView.getVisibility() == View.VISIBLE 1512 && f.mPostponedAlpha >= 0) { 1513 anim = loadAnimation(f, transit, false, 1514 transitionStyle); 1515 } 1516 f.mPostponedAlpha = 0; 1517 if (anim != null) { 1518 animateRemoveFragment(f, anim, newState); 1519 } 1520 f.mContainer.removeView(f.mView); 1521 } 1522 f.mContainer = null; 1523 f.mView = null; 1524 f.mInnerView = null; 1525 f.mInLayout = false; 1526 } 1527 // fall through 1528 case Fragment.CREATED: 1529 if (newState < Fragment.CREATED) { 1530 if (mDestroyed) { 1531 // The fragment's containing activity is 1532 // being destroyed, but this fragment is 1533 // currently animating away. Stop the 1534 // animation right now -- it is not needed, 1535 // and we can't wait any more on destroying 1536 // the fragment. 1537 if (f.getAnimatingAway() != null) { 1538 View v = f.getAnimatingAway(); 1539 f.setAnimatingAway(null); 1540 v.clearAnimation(); 1541 } else if (f.getAnimator() != null) { 1542 Animator animator = f.getAnimator(); 1543 f.setAnimator(null); 1544 animator.cancel(); 1545 } 1546 } 1547 if (f.getAnimatingAway() != null || f.getAnimator() != null) { 1548 // We are waiting for the fragment's view to finish 1549 // animating away. Just make a note of the state 1550 // the fragment now should move to once the animation 1551 // is done. 1552 f.setStateAfterAnimating(newState); 1553 newState = Fragment.CREATED; 1554 } else { 1555 if (DEBUG) Log.v(TAG, "movefrom CREATED: " + f); 1556 if (!f.mRetaining) { 1557 f.performDestroy(); 1558 dispatchOnFragmentDestroyed(f, false); 1559 } else { 1560 f.mState = Fragment.INITIALIZING; 1561 } 1562 1563 f.performDetach(); 1564 dispatchOnFragmentDetached(f, false); 1565 if (!keepActive) { 1566 if (!f.mRetaining) { 1567 makeInactive(f); 1568 } else { 1569 f.mHost = null; 1570 f.mParentFragment = null; 1571 f.mFragmentManager = null; 1572 } 1573 } 1574 } 1575 } 1576 } 1577 } 1578 1579 if (f.mState != newState) { 1580 Log.w(TAG, "moveToState: Fragment state for " + f + " not updated inline; " 1581 + "expected state " + newState + " found " + f.mState); 1582 f.mState = newState; 1583 } 1584 } 1585 1586 /** 1587 * Animates the removal of a fragment with the given animator or animation. After animating, 1588 * the fragment's view will be removed from the hierarchy. 1589 * 1590 * @param fragment The fragment to animate out 1591 * @param anim The animator or animation to run on the fragment's view 1592 * @param newState The final state after animating. 1593 */ 1594 private void animateRemoveFragment(@NonNull final Fragment fragment, 1595 @NonNull AnimationOrAnimator anim, final int newState) { 1596 final View viewToAnimate = fragment.mView; 1597 fragment.setStateAfterAnimating(newState); 1598 if (anim.animation != null) { 1599 Animation animation = anim.animation; 1600 fragment.setAnimatingAway(fragment.mView); 1601 AnimationListener listener = getAnimationListener(animation); 1602 animation.setAnimationListener(new AnimationListenerWrapper(listener) { 1603 @Override 1604 public void onAnimationEnd(Animation animation) { 1605 super.onAnimationEnd(animation); 1606 if (fragment.getAnimatingAway() != null) { 1607 fragment.setAnimatingAway(null); 1608 moveToState(fragment, fragment.getStateAfterAnimating(), 0, 0, false); 1609 } 1610 } 1611 }); 1612 setHWLayerAnimListenerIfAlpha(viewToAnimate, anim); 1613 fragment.mView.startAnimation(animation); 1614 } else { 1615 final Animator animator = anim.animator; 1616 fragment.setAnimator(anim.animator); 1617 final ViewGroup container = fragment.mContainer; 1618 if (container != null) { 1619 container.startViewTransition(viewToAnimate); 1620 } 1621 animator.addListener(new AnimatorListenerAdapter() { 1622 @Override 1623 public void onAnimationEnd(Animator anim) { 1624 if (container != null) { 1625 container.endViewTransition(viewToAnimate); 1626 } 1627 if (fragment.getAnimator() != null) { 1628 fragment.setAnimator(null); 1629 moveToState(fragment, fragment.getStateAfterAnimating(), 0, 0, false); 1630 } 1631 } 1632 }); 1633 animator.setTarget(fragment.mView); 1634 setHWLayerAnimListenerIfAlpha(fragment.mView, anim); 1635 animator.start(); 1636 } 1637 } 1638 1639 void moveToState(Fragment f) { 1640 moveToState(f, mCurState, 0, 0, false); 1641 } 1642 1643 void ensureInflatedFragmentView(Fragment f) { 1644 if (f.mFromLayout && !f.mPerformedCreateView) { 1645 f.mView = f.performCreateView(f.performGetLayoutInflater( 1646 f.mSavedFragmentState), null, f.mSavedFragmentState); 1647 if (f.mView != null) { 1648 f.mInnerView = f.mView; 1649 f.mView.setSaveFromParentEnabled(false); 1650 if (f.mHidden) f.mView.setVisibility(View.GONE); 1651 f.onViewCreated(f.mView, f.mSavedFragmentState); 1652 dispatchOnFragmentViewCreated(f, f.mView, f.mSavedFragmentState, false); 1653 } else { 1654 f.mInnerView = null; 1655 } 1656 } 1657 } 1658 1659 /** 1660 * Fragments that have been shown or hidden don't have their visibility changed or 1661 * animations run during the {@link #showFragment(Fragment)} or {@link #hideFragment(Fragment)} 1662 * calls. After fragments are brought to their final state in 1663 * {@link #moveFragmentToExpectedState(Fragment)} the fragments that have been shown or 1664 * hidden must have their visibility changed and their animations started here. 1665 * 1666 * @param fragment The fragment with mHiddenChanged = true that should change its View's 1667 * visibility and start the show or hide animation. 1668 */ 1669 void completeShowHideFragment(final Fragment fragment) { 1670 if (fragment.mView != null) { 1671 AnimationOrAnimator anim = loadAnimation(fragment, fragment.getNextTransition(), 1672 !fragment.mHidden, fragment.getNextTransitionStyle()); 1673 if (anim != null && anim.animator != null) { 1674 anim.animator.setTarget(fragment.mView); 1675 if (fragment.mHidden) { 1676 if (fragment.isHideReplaced()) { 1677 fragment.setHideReplaced(false); 1678 } else { 1679 final ViewGroup container = fragment.mContainer; 1680 final View animatingView = fragment.mView; 1681 container.startViewTransition(animatingView); 1682 // Delay the actual hide operation until the animation finishes, 1683 // otherwise the fragment will just immediately disappear 1684 anim.animator.addListener(new AnimatorListenerAdapter() { 1685 @Override 1686 public void onAnimationEnd(Animator animation) { 1687 container.endViewTransition(animatingView); 1688 animation.removeListener(this); 1689 if (fragment.mView != null) { 1690 fragment.mView.setVisibility(View.GONE); 1691 } 1692 } 1693 }); 1694 } 1695 } else { 1696 fragment.mView.setVisibility(View.VISIBLE); 1697 } 1698 setHWLayerAnimListenerIfAlpha(fragment.mView, anim); 1699 anim.animator.start(); 1700 } else { 1701 if (anim != null) { 1702 setHWLayerAnimListenerIfAlpha(fragment.mView, anim); 1703 fragment.mView.startAnimation(anim.animation); 1704 anim.animation.start(); 1705 } 1706 final int visibility = fragment.mHidden && !fragment.isHideReplaced() 1707 ? View.GONE 1708 : View.VISIBLE; 1709 fragment.mView.setVisibility(visibility); 1710 if (fragment.isHideReplaced()) { 1711 fragment.setHideReplaced(false); 1712 } 1713 } 1714 } 1715 if (fragment.mAdded && fragment.mHasMenu && fragment.mMenuVisible) { 1716 mNeedMenuInvalidate = true; 1717 } 1718 fragment.mHiddenChanged = false; 1719 fragment.onHiddenChanged(fragment.mHidden); 1720 } 1721 1722 /** 1723 * Moves a fragment to its expected final state or the fragment manager's state, depending 1724 * on whether the fragment manager's state is raised properly. 1725 * 1726 * @param f The fragment to change. 1727 */ 1728 void moveFragmentToExpectedState(Fragment f) { 1729 if (f == null) { 1730 return; 1731 } 1732 int nextState = mCurState; 1733 if (f.mRemoving) { 1734 if (f.isInBackStack()) { 1735 nextState = Math.min(nextState, Fragment.CREATED); 1736 } else { 1737 nextState = Math.min(nextState, Fragment.INITIALIZING); 1738 } 1739 } 1740 moveToState(f, nextState, f.getNextTransition(), f.getNextTransitionStyle(), false); 1741 1742 if (f.mView != null) { 1743 // Move the view if it is out of order 1744 Fragment underFragment = findFragmentUnder(f); 1745 if (underFragment != null) { 1746 final View underView = underFragment.mView; 1747 // make sure this fragment is in the right order. 1748 final ViewGroup container = f.mContainer; 1749 int underIndex = container.indexOfChild(underView); 1750 int viewIndex = container.indexOfChild(f.mView); 1751 if (viewIndex < underIndex) { 1752 container.removeViewAt(viewIndex); 1753 container.addView(f.mView, underIndex); 1754 } 1755 } 1756 if (f.mIsNewlyAdded && f.mContainer != null) { 1757 // Make it visible and run the animations 1758 if (f.mPostponedAlpha > 0f) { 1759 f.mView.setAlpha(f.mPostponedAlpha); 1760 } 1761 f.mPostponedAlpha = 0f; 1762 f.mIsNewlyAdded = false; 1763 // run animations: 1764 AnimationOrAnimator anim = loadAnimation(f, f.getNextTransition(), true, 1765 f.getNextTransitionStyle()); 1766 if (anim != null) { 1767 setHWLayerAnimListenerIfAlpha(f.mView, anim); 1768 if (anim.animation != null) { 1769 f.mView.startAnimation(anim.animation); 1770 } else { 1771 anim.animator.setTarget(f.mView); 1772 anim.animator.start(); 1773 } 1774 } 1775 } 1776 } 1777 if (f.mHiddenChanged) { 1778 completeShowHideFragment(f); 1779 } 1780 } 1781 1782 /** 1783 * Changes the state of the fragment manager to {@code newState}. If the fragment manager 1784 * changes state or {@code always} is {@code true}, any fragments within it have their 1785 * states updated as well. 1786 * 1787 * @param newState The new state for the fragment manager 1788 * @param always If {@code true}, all fragments update their state, even 1789 * if {@code newState} matches the current fragment manager's state. 1790 */ 1791 void moveToState(int newState, boolean always) { 1792 if (mHost == null && newState != Fragment.INITIALIZING) { 1793 throw new IllegalStateException("No activity"); 1794 } 1795 1796 if (!always && newState == mCurState) { 1797 return; 1798 } 1799 1800 mCurState = newState; 1801 1802 if (mActive != null) { 1803 boolean loadersRunning = false; 1804 1805 // Must add them in the proper order. mActive fragments may be out of order 1806 final int numAdded = mAdded.size(); 1807 for (int i = 0; i < numAdded; i++) { 1808 Fragment f = mAdded.get(i); 1809 moveFragmentToExpectedState(f); 1810 if (f.mLoaderManager != null) { 1811 loadersRunning |= f.mLoaderManager.hasRunningLoaders(); 1812 } 1813 } 1814 1815 // Now iterate through all active fragments. These will include those that are removed 1816 // and detached. 1817 final int numActive = mActive.size(); 1818 for (int i = 0; i < numActive; i++) { 1819 Fragment f = mActive.valueAt(i); 1820 if (f != null && (f.mRemoving || f.mDetached) && !f.mIsNewlyAdded) { 1821 moveFragmentToExpectedState(f); 1822 if (f.mLoaderManager != null) { 1823 loadersRunning |= f.mLoaderManager.hasRunningLoaders(); 1824 } 1825 } 1826 } 1827 1828 if (!loadersRunning) { 1829 startPendingDeferredFragments(); 1830 } 1831 1832 if (mNeedMenuInvalidate && mHost != null && mCurState == Fragment.RESUMED) { 1833 mHost.onSupportInvalidateOptionsMenu(); 1834 mNeedMenuInvalidate = false; 1835 } 1836 } 1837 } 1838 1839 void startPendingDeferredFragments() { 1840 if (mActive == null) return; 1841 1842 for (int i=0; i<mActive.size(); i++) { 1843 Fragment f = mActive.valueAt(i); 1844 if (f != null) { 1845 performPendingDeferredStart(f); 1846 } 1847 } 1848 } 1849 1850 void makeActive(Fragment f) { 1851 if (f.mIndex >= 0) { 1852 return; 1853 } 1854 1855 f.setIndex(mNextFragmentIndex++, mParent); 1856 if (mActive == null) { 1857 mActive = new SparseArray<>(); 1858 } 1859 mActive.put(f.mIndex, f); 1860 if (DEBUG) Log.v(TAG, "Allocated fragment index " + f); 1861 } 1862 1863 void makeInactive(Fragment f) { 1864 if (f.mIndex < 0) { 1865 return; 1866 } 1867 1868 if (DEBUG) Log.v(TAG, "Freeing fragment index " + f); 1869 // Don't remove yet. That happens in burpActive(). This prevents 1870 // concurrent modification while iterating over mActive 1871 mActive.put(f.mIndex, null); 1872 1873 mHost.inactivateFragment(f.mWho); 1874 f.initState(); 1875 } 1876 1877 public void addFragment(Fragment fragment, boolean moveToStateNow) { 1878 if (DEBUG) Log.v(TAG, "add: " + fragment); 1879 makeActive(fragment); 1880 if (!fragment.mDetached) { 1881 if (mAdded.contains(fragment)) { 1882 throw new IllegalStateException("Fragment already added: " + fragment); 1883 } 1884 synchronized (mAdded) { 1885 mAdded.add(fragment); 1886 } 1887 fragment.mAdded = true; 1888 fragment.mRemoving = false; 1889 if (fragment.mView == null) { 1890 fragment.mHiddenChanged = false; 1891 } 1892 if (fragment.mHasMenu && fragment.mMenuVisible) { 1893 mNeedMenuInvalidate = true; 1894 } 1895 if (moveToStateNow) { 1896 moveToState(fragment); 1897 } 1898 } 1899 } 1900 1901 public void removeFragment(Fragment fragment) { 1902 if (DEBUG) Log.v(TAG, "remove: " + fragment + " nesting=" + fragment.mBackStackNesting); 1903 final boolean inactive = !fragment.isInBackStack(); 1904 if (!fragment.mDetached || inactive) { 1905 synchronized (mAdded) { 1906 mAdded.remove(fragment); 1907 } 1908 if (fragment.mHasMenu && fragment.mMenuVisible) { 1909 mNeedMenuInvalidate = true; 1910 } 1911 fragment.mAdded = false; 1912 fragment.mRemoving = true; 1913 } 1914 } 1915 1916 /** 1917 * Marks a fragment as hidden to be later animated in with 1918 * {@link #completeShowHideFragment(Fragment)}. 1919 * 1920 * @param fragment The fragment to be shown. 1921 */ 1922 public void hideFragment(Fragment fragment) { 1923 if (DEBUG) Log.v(TAG, "hide: " + fragment); 1924 if (!fragment.mHidden) { 1925 fragment.mHidden = true; 1926 // Toggle hidden changed so that if a fragment goes through show/hide/show 1927 // it doesn't go through the animation. 1928 fragment.mHiddenChanged = !fragment.mHiddenChanged; 1929 } 1930 } 1931 1932 /** 1933 * Marks a fragment as shown to be later animated in with 1934 * {@link #completeShowHideFragment(Fragment)}. 1935 * 1936 * @param fragment The fragment to be shown. 1937 */ 1938 public void showFragment(Fragment fragment) { 1939 if (DEBUG) Log.v(TAG, "show: " + fragment); 1940 if (fragment.mHidden) { 1941 fragment.mHidden = false; 1942 // Toggle hidden changed so that if a fragment goes through show/hide/show 1943 // it doesn't go through the animation. 1944 fragment.mHiddenChanged = !fragment.mHiddenChanged; 1945 } 1946 } 1947 1948 public void detachFragment(Fragment fragment) { 1949 if (DEBUG) Log.v(TAG, "detach: " + fragment); 1950 if (!fragment.mDetached) { 1951 fragment.mDetached = true; 1952 if (fragment.mAdded) { 1953 // We are not already in back stack, so need to remove the fragment. 1954 if (DEBUG) Log.v(TAG, "remove from detach: " + fragment); 1955 synchronized (mAdded) { 1956 mAdded.remove(fragment); 1957 } 1958 if (fragment.mHasMenu && fragment.mMenuVisible) { 1959 mNeedMenuInvalidate = true; 1960 } 1961 fragment.mAdded = false; 1962 } 1963 } 1964 } 1965 1966 public void attachFragment(Fragment fragment) { 1967 if (DEBUG) Log.v(TAG, "attach: " + fragment); 1968 if (fragment.mDetached) { 1969 fragment.mDetached = false; 1970 if (!fragment.mAdded) { 1971 if (mAdded.contains(fragment)) { 1972 throw new IllegalStateException("Fragment already added: " + fragment); 1973 } 1974 if (DEBUG) Log.v(TAG, "add from attach: " + fragment); 1975 synchronized (mAdded) { 1976 mAdded.add(fragment); 1977 } 1978 fragment.mAdded = true; 1979 if (fragment.mHasMenu && fragment.mMenuVisible) { 1980 mNeedMenuInvalidate = true; 1981 } 1982 } 1983 } 1984 } 1985 1986 @Override 1987 public Fragment findFragmentById(int id) { 1988 // First look through added fragments. 1989 for (int i = mAdded.size() - 1; i >= 0; i--) { 1990 Fragment f = mAdded.get(i); 1991 if (f != null && f.mFragmentId == id) { 1992 return f; 1993 } 1994 } 1995 if (mActive != null) { 1996 // Now for any known fragment. 1997 for (int i=mActive.size()-1; i>=0; i--) { 1998 Fragment f = mActive.valueAt(i); 1999 if (f != null && f.mFragmentId == id) { 2000 return f; 2001 } 2002 } 2003 } 2004 return null; 2005 } 2006 2007 @Override 2008 public Fragment findFragmentByTag(String tag) { 2009 if (tag != null) { 2010 // First look through added fragments. 2011 for (int i=mAdded.size()-1; i>=0; i--) { 2012 Fragment f = mAdded.get(i); 2013 if (f != null && tag.equals(f.mTag)) { 2014 return f; 2015 } 2016 } 2017 } 2018 if (mActive != null && tag != null) { 2019 // Now for any known fragment. 2020 for (int i=mActive.size()-1; i>=0; i--) { 2021 Fragment f = mActive.valueAt(i); 2022 if (f != null && tag.equals(f.mTag)) { 2023 return f; 2024 } 2025 } 2026 } 2027 return null; 2028 } 2029 2030 public Fragment findFragmentByWho(String who) { 2031 if (mActive != null && who != null) { 2032 for (int i=mActive.size()-1; i>=0; i--) { 2033 Fragment f = mActive.valueAt(i); 2034 if (f != null && (f=f.findFragmentByWho(who)) != null) { 2035 return f; 2036 } 2037 } 2038 } 2039 return null; 2040 } 2041 2042 private void checkStateLoss() { 2043 if (mStateSaved) { 2044 throw new IllegalStateException( 2045 "Can not perform this action after onSaveInstanceState"); 2046 } 2047 if (mNoTransactionsBecause != null) { 2048 throw new IllegalStateException( 2049 "Can not perform this action inside of " + mNoTransactionsBecause); 2050 } 2051 } 2052 2053 @Override 2054 public boolean isStateSaved() { 2055 return mStateSaved; 2056 } 2057 2058 /** 2059 * Adds an action to the queue of pending actions. 2060 * 2061 * @param action the action to add 2062 * @param allowStateLoss whether to allow loss of state information 2063 * @throws IllegalStateException if the activity has been destroyed 2064 */ 2065 public void enqueueAction(OpGenerator action, boolean allowStateLoss) { 2066 if (!allowStateLoss) { 2067 checkStateLoss(); 2068 } 2069 synchronized (this) { 2070 if (mDestroyed || mHost == null) { 2071 if (allowStateLoss) { 2072 // This FragmentManager isn't attached, so drop the entire transaction. 2073 return; 2074 } 2075 throw new IllegalStateException("Activity has been destroyed"); 2076 } 2077 if (mPendingActions == null) { 2078 mPendingActions = new ArrayList<>(); 2079 } 2080 mPendingActions.add(action); 2081 scheduleCommit(); 2082 } 2083 } 2084 2085 /** 2086 * Schedules the execution when one hasn't been scheduled already. This should happen 2087 * the first time {@link #enqueueAction(OpGenerator, boolean)} is called or when 2088 * a postponed transaction has been started with 2089 * {@link Fragment#startPostponedEnterTransition()} 2090 */ 2091 private void scheduleCommit() { 2092 synchronized (this) { 2093 boolean postponeReady = 2094 mPostponedTransactions != null && !mPostponedTransactions.isEmpty(); 2095 boolean pendingReady = mPendingActions != null && mPendingActions.size() == 1; 2096 if (postponeReady || pendingReady) { 2097 mHost.getHandler().removeCallbacks(mExecCommit); 2098 mHost.getHandler().post(mExecCommit); 2099 } 2100 } 2101 } 2102 2103 public int allocBackStackIndex(BackStackRecord bse) { 2104 synchronized (this) { 2105 if (mAvailBackStackIndices == null || mAvailBackStackIndices.size() <= 0) { 2106 if (mBackStackIndices == null) { 2107 mBackStackIndices = new ArrayList<BackStackRecord>(); 2108 } 2109 int index = mBackStackIndices.size(); 2110 if (DEBUG) Log.v(TAG, "Setting back stack index " + index + " to " + bse); 2111 mBackStackIndices.add(bse); 2112 return index; 2113 2114 } else { 2115 int index = mAvailBackStackIndices.remove(mAvailBackStackIndices.size()-1); 2116 if (DEBUG) Log.v(TAG, "Adding back stack index " + index + " with " + bse); 2117 mBackStackIndices.set(index, bse); 2118 return index; 2119 } 2120 } 2121 } 2122 2123 public void setBackStackIndex(int index, BackStackRecord bse) { 2124 synchronized (this) { 2125 if (mBackStackIndices == null) { 2126 mBackStackIndices = new ArrayList<BackStackRecord>(); 2127 } 2128 int N = mBackStackIndices.size(); 2129 if (index < N) { 2130 if (DEBUG) Log.v(TAG, "Setting back stack index " + index + " to " + bse); 2131 mBackStackIndices.set(index, bse); 2132 } else { 2133 while (N < index) { 2134 mBackStackIndices.add(null); 2135 if (mAvailBackStackIndices == null) { 2136 mAvailBackStackIndices = new ArrayList<Integer>(); 2137 } 2138 if (DEBUG) Log.v(TAG, "Adding available back stack index " + N); 2139 mAvailBackStackIndices.add(N); 2140 N++; 2141 } 2142 if (DEBUG) Log.v(TAG, "Adding back stack index " + index + " with " + bse); 2143 mBackStackIndices.add(bse); 2144 } 2145 } 2146 } 2147 2148 public void freeBackStackIndex(int index) { 2149 synchronized (this) { 2150 mBackStackIndices.set(index, null); 2151 if (mAvailBackStackIndices == null) { 2152 mAvailBackStackIndices = new ArrayList<Integer>(); 2153 } 2154 if (DEBUG) Log.v(TAG, "Freeing back stack index " + index); 2155 mAvailBackStackIndices.add(index); 2156 } 2157 } 2158 2159 /** 2160 * Broken out from exec*, this prepares for gathering and executing operations. 2161 * 2162 * @param allowStateLoss true if state loss should be ignored or false if it should be 2163 * checked. 2164 */ 2165 private void ensureExecReady(boolean allowStateLoss) { 2166 if (mExecutingActions) { 2167 throw new IllegalStateException("FragmentManager is already executing transactions"); 2168 } 2169 2170 if (Looper.myLooper() != mHost.getHandler().getLooper()) { 2171 throw new IllegalStateException("Must be called from main thread of fragment host"); 2172 } 2173 2174 if (!allowStateLoss) { 2175 checkStateLoss(); 2176 } 2177 2178 if (mTmpRecords == null) { 2179 mTmpRecords = new ArrayList<>(); 2180 mTmpIsPop = new ArrayList<>(); 2181 } 2182 mExecutingActions = true; 2183 try { 2184 executePostponedTransaction(null, null); 2185 } finally { 2186 mExecutingActions = false; 2187 } 2188 } 2189 2190 public void execSingleAction(OpGenerator action, boolean allowStateLoss) { 2191 if (allowStateLoss && (mHost == null || mDestroyed)) { 2192 // This FragmentManager isn't attached, so drop the entire transaction. 2193 return; 2194 } 2195 ensureExecReady(allowStateLoss); 2196 if (action.generateOps(mTmpRecords, mTmpIsPop)) { 2197 mExecutingActions = true; 2198 try { 2199 removeRedundantOperationsAndExecute(mTmpRecords, mTmpIsPop); 2200 } finally { 2201 cleanupExec(); 2202 } 2203 } 2204 2205 doPendingDeferredStart(); 2206 burpActive(); 2207 } 2208 2209 /** 2210 * Broken out of exec*, this cleans up the mExecutingActions and the temporary structures 2211 * used in executing operations. 2212 */ 2213 private void cleanupExec() { 2214 mExecutingActions = false; 2215 mTmpIsPop.clear(); 2216 mTmpRecords.clear(); 2217 } 2218 2219 /** 2220 * Only call from main thread! 2221 */ 2222 public boolean execPendingActions() { 2223 ensureExecReady(true); 2224 2225 boolean didSomething = false; 2226 while (generateOpsForPendingActions(mTmpRecords, mTmpIsPop)) { 2227 mExecutingActions = true; 2228 try { 2229 removeRedundantOperationsAndExecute(mTmpRecords, mTmpIsPop); 2230 } finally { 2231 cleanupExec(); 2232 } 2233 didSomething = true; 2234 } 2235 2236 doPendingDeferredStart(); 2237 burpActive(); 2238 2239 return didSomething; 2240 } 2241 2242 /** 2243 * Complete the execution of transactions that have previously been postponed, but are 2244 * now ready. 2245 */ 2246 private void executePostponedTransaction(ArrayList<BackStackRecord> records, 2247 ArrayList<Boolean> isRecordPop) { 2248 int numPostponed = mPostponedTransactions == null ? 0 : mPostponedTransactions.size(); 2249 for (int i = 0; i < numPostponed; i++) { 2250 StartEnterTransitionListener listener = mPostponedTransactions.get(i); 2251 if (records != null && !listener.mIsBack) { 2252 int index = records.indexOf(listener.mRecord); 2253 if (index != -1 && isRecordPop.get(index)) { 2254 listener.cancelTransaction(); 2255 continue; 2256 } 2257 } 2258 if (listener.isReady() || (records != null 2259 && listener.mRecord.interactsWith(records, 0, records.size()))) { 2260 mPostponedTransactions.remove(i); 2261 i--; 2262 numPostponed--; 2263 int index; 2264 if (records != null && !listener.mIsBack 2265 && (index = records.indexOf(listener.mRecord)) != -1 2266 && isRecordPop.get(index)) { 2267 // This is popping a postponed transaction 2268 listener.cancelTransaction(); 2269 } else { 2270 listener.completeTransaction(); 2271 } 2272 } 2273 } 2274 } 2275 2276 /** 2277 * Remove redundant BackStackRecord operations and executes them. This method merges operations 2278 * of proximate records that allow reordering. See 2279 * {@link FragmentTransaction#setReorderingAllowed(boolean)}. 2280 * <p> 2281 * For example, a transaction that adds to the back stack and then another that pops that 2282 * back stack record will be optimized to remove the unnecessary operation. 2283 * <p> 2284 * Likewise, two transactions committed that are executed at the same time will be optimized 2285 * to remove the redundant operations as well as two pop operations executed together. 2286 * 2287 * @param records The records pending execution 2288 * @param isRecordPop The direction that these records are being run. 2289 */ 2290 private void removeRedundantOperationsAndExecute(ArrayList<BackStackRecord> records, 2291 ArrayList<Boolean> isRecordPop) { 2292 if (records == null || records.isEmpty()) { 2293 return; 2294 } 2295 2296 if (isRecordPop == null || records.size() != isRecordPop.size()) { 2297 throw new IllegalStateException("Internal error with the back stack records"); 2298 } 2299 2300 // Force start of any postponed transactions that interact with scheduled transactions: 2301 executePostponedTransaction(records, isRecordPop); 2302 2303 final int numRecords = records.size(); 2304 int startIndex = 0; 2305 for (int recordNum = 0; recordNum < numRecords; recordNum++) { 2306 final boolean canReorder = records.get(recordNum).mReorderingAllowed; 2307 if (!canReorder) { 2308 // execute all previous transactions 2309 if (startIndex != recordNum) { 2310 executeOpsTogether(records, isRecordPop, startIndex, recordNum); 2311 } 2312 // execute all pop operations that don't allow reordering together or 2313 // one add operation 2314 int reorderingEnd = recordNum + 1; 2315 if (isRecordPop.get(recordNum)) { 2316 while (reorderingEnd < numRecords 2317 && isRecordPop.get(reorderingEnd) 2318 && !records.get(reorderingEnd).mReorderingAllowed) { 2319 reorderingEnd++; 2320 } 2321 } 2322 executeOpsTogether(records, isRecordPop, recordNum, reorderingEnd); 2323 startIndex = reorderingEnd; 2324 recordNum = reorderingEnd - 1; 2325 } 2326 } 2327 if (startIndex != numRecords) { 2328 executeOpsTogether(records, isRecordPop, startIndex, numRecords); 2329 } 2330 } 2331 2332 /** 2333 * Executes a subset of a list of BackStackRecords, all of which either allow reordering or 2334 * do not allow ordering. 2335 * @param records A list of BackStackRecords that are to be executed 2336 * @param isRecordPop The direction that these records are being run. 2337 * @param startIndex The index of the first record in <code>records</code> to be executed 2338 * @param endIndex One more than the final record index in <code>records</code> to executed. 2339 */ 2340 private void executeOpsTogether(ArrayList<BackStackRecord> records, 2341 ArrayList<Boolean> isRecordPop, int startIndex, int endIndex) { 2342 final boolean allowReordering = records.get(startIndex).mReorderingAllowed; 2343 boolean addToBackStack = false; 2344 if (mTmpAddedFragments == null) { 2345 mTmpAddedFragments = new ArrayList<>(); 2346 } else { 2347 mTmpAddedFragments.clear(); 2348 } 2349 mTmpAddedFragments.addAll(mAdded); 2350 Fragment oldPrimaryNav = getPrimaryNavigationFragment(); 2351 for (int recordNum = startIndex; recordNum < endIndex; recordNum++) { 2352 final BackStackRecord record = records.get(recordNum); 2353 final boolean isPop = isRecordPop.get(recordNum); 2354 if (!isPop) { 2355 oldPrimaryNav = record.expandOps(mTmpAddedFragments, oldPrimaryNav); 2356 } else { 2357 oldPrimaryNav = record.trackAddedFragmentsInPop(mTmpAddedFragments, oldPrimaryNav); 2358 } 2359 addToBackStack = addToBackStack || record.mAddToBackStack; 2360 } 2361 mTmpAddedFragments.clear(); 2362 2363 if (!allowReordering) { 2364 FragmentTransition.startTransitions(this, records, isRecordPop, startIndex, endIndex, 2365 false); 2366 } 2367 executeOps(records, isRecordPop, startIndex, endIndex); 2368 2369 int postponeIndex = endIndex; 2370 if (allowReordering) { 2371 ArraySet<Fragment> addedFragments = new ArraySet<>(); 2372 addAddedFragments(addedFragments); 2373 postponeIndex = postponePostponableTransactions(records, isRecordPop, 2374 startIndex, endIndex, addedFragments); 2375 makeRemovedFragmentsInvisible(addedFragments); 2376 } 2377 2378 if (postponeIndex != startIndex && allowReordering) { 2379 // need to run something now 2380 FragmentTransition.startTransitions(this, records, isRecordPop, startIndex, 2381 postponeIndex, true); 2382 moveToState(mCurState, true); 2383 } 2384 2385 for (int recordNum = startIndex; recordNum < endIndex; recordNum++) { 2386 final BackStackRecord record = records.get(recordNum); 2387 final boolean isPop = isRecordPop.get(recordNum); 2388 if (isPop && record.mIndex >= 0) { 2389 freeBackStackIndex(record.mIndex); 2390 record.mIndex = -1; 2391 } 2392 record.runOnCommitRunnables(); 2393 } 2394 if (addToBackStack) { 2395 reportBackStackChanged(); 2396 } 2397 } 2398 2399 /** 2400 * Any fragments that were removed because they have been postponed should have their views 2401 * made invisible by setting their alpha to 0. 2402 * 2403 * @param fragments The fragments that were added during operation execution. Only the ones 2404 * that are no longer added will have their alpha changed. 2405 */ 2406 private void makeRemovedFragmentsInvisible(ArraySet<Fragment> fragments) { 2407 final int numAdded = fragments.size(); 2408 for (int i = 0; i < numAdded; i++) { 2409 final Fragment fragment = fragments.valueAt(i); 2410 if (!fragment.mAdded) { 2411 final View view = fragment.getView(); 2412 fragment.mPostponedAlpha = view.getAlpha(); 2413 view.setAlpha(0f); 2414 } 2415 } 2416 } 2417 2418 /** 2419 * Examine all transactions and determine which ones are marked as postponed. Those will 2420 * have their operations rolled back and moved to the end of the record list (up to endIndex). 2421 * It will also add the postponed transaction to the queue. 2422 * 2423 * @param records A list of BackStackRecords that should be checked. 2424 * @param isRecordPop The direction that these records are being run. 2425 * @param startIndex The index of the first record in <code>records</code> to be checked 2426 * @param endIndex One more than the final record index in <code>records</code> to be checked. 2427 * @return The index of the first postponed transaction or endIndex if no transaction was 2428 * postponed. 2429 */ 2430 private int postponePostponableTransactions(ArrayList<BackStackRecord> records, 2431 ArrayList<Boolean> isRecordPop, int startIndex, int endIndex, 2432 ArraySet<Fragment> added) { 2433 int postponeIndex = endIndex; 2434 for (int i = endIndex - 1; i >= startIndex; i--) { 2435 final BackStackRecord record = records.get(i); 2436 final boolean isPop = isRecordPop.get(i); 2437 boolean isPostponed = record.isPostponed() 2438 && !record.interactsWith(records, i + 1, endIndex); 2439 if (isPostponed) { 2440 if (mPostponedTransactions == null) { 2441 mPostponedTransactions = new ArrayList<>(); 2442 } 2443 StartEnterTransitionListener listener = 2444 new StartEnterTransitionListener(record, isPop); 2445 mPostponedTransactions.add(listener); 2446 record.setOnStartPostponedListener(listener); 2447 2448 // roll back the transaction 2449 if (isPop) { 2450 record.executeOps(); 2451 } else { 2452 record.executePopOps(false); 2453 } 2454 2455 // move to the end 2456 postponeIndex--; 2457 if (i != postponeIndex) { 2458 records.remove(i); 2459 records.add(postponeIndex, record); 2460 } 2461 2462 // different views may be visible now 2463 addAddedFragments(added); 2464 } 2465 } 2466 return postponeIndex; 2467 } 2468 2469 /** 2470 * When a postponed transaction is ready to be started, this completes the transaction, 2471 * removing, hiding, or showing views as well as starting the animations and transitions. 2472 * <p> 2473 * {@code runtransitions} is set to false when the transaction postponement was interrupted 2474 * abnormally -- normally by a new transaction being started that affects the postponed 2475 * transaction. 2476 * 2477 * @param record The transaction to run 2478 * @param isPop true if record is popping or false if it is adding 2479 * @param runTransitions true if the fragment transition should be run or false otherwise. 2480 * @param moveToState true if the state should be changed after executing the operations. 2481 * This is false when the transaction is canceled when a postponed 2482 * transaction is popped. 2483 */ 2484 private void completeExecute(BackStackRecord record, boolean isPop, boolean runTransitions, 2485 boolean moveToState) { 2486 if (isPop) { 2487 record.executePopOps(moveToState); 2488 } else { 2489 record.executeOps(); 2490 } 2491 ArrayList<BackStackRecord> records = new ArrayList<>(1); 2492 ArrayList<Boolean> isRecordPop = new ArrayList<>(1); 2493 records.add(record); 2494 isRecordPop.add(isPop); 2495 if (runTransitions) { 2496 FragmentTransition.startTransitions(this, records, isRecordPop, 0, 1, true); 2497 } 2498 if (moveToState) { 2499 moveToState(mCurState, true); 2500 } 2501 2502 if (mActive != null) { 2503 final int numActive = mActive.size(); 2504 for (int i = 0; i < numActive; i++) { 2505 // Allow added fragments to be removed during the pop since we aren't going 2506 // to move them to the final state with moveToState(mCurState). 2507 Fragment fragment = mActive.valueAt(i); 2508 if (fragment != null && fragment.mView != null && fragment.mIsNewlyAdded 2509 && record.interactsWith(fragment.mContainerId)) { 2510 if (fragment.mPostponedAlpha > 0) { 2511 fragment.mView.setAlpha(fragment.mPostponedAlpha); 2512 } 2513 if (moveToState) { 2514 fragment.mPostponedAlpha = 0; 2515 } else { 2516 fragment.mPostponedAlpha = -1; 2517 fragment.mIsNewlyAdded = false; 2518 } 2519 } 2520 } 2521 } 2522 } 2523 2524 /** 2525 * Find a fragment within the fragment's container whose View should be below the passed 2526 * fragment. {@code null} is returned when the fragment has no View or if there should be 2527 * no fragment with a View below the given fragment. 2528 * 2529 * As an example, if mAdded has two Fragments with Views sharing the same container: 2530 * FragmentA 2531 * FragmentB 2532 * 2533 * Then, when processing FragmentB, FragmentA will be returned. If, however, FragmentA 2534 * had no View, null would be returned. 2535 * 2536 * @param f The fragment that may be on top of another fragment. 2537 * @return The fragment with a View under f, if one exists or null if f has no View or 2538 * there are no fragments with Views in the same container. 2539 */ 2540 private Fragment findFragmentUnder(Fragment f) { 2541 final ViewGroup container = f.mContainer; 2542 final View view = f.mView; 2543 2544 if (container == null || view == null) { 2545 return null; 2546 } 2547 2548 final int fragmentIndex = mAdded.indexOf(f); 2549 for (int i = fragmentIndex - 1; i >= 0; i--) { 2550 Fragment underFragment = mAdded.get(i); 2551 if (underFragment.mContainer == container && underFragment.mView != null) { 2552 // Found the fragment under this one 2553 return underFragment; 2554 } 2555 } 2556 return null; 2557 } 2558 2559 /** 2560 * Run the operations in the BackStackRecords, either to push or pop. 2561 * 2562 * @param records The list of records whose operations should be run. 2563 * @param isRecordPop The direction that these records are being run. 2564 * @param startIndex The index of the first entry in records to run. 2565 * @param endIndex One past the index of the final entry in records to run. 2566 */ 2567 private static void executeOps(ArrayList<BackStackRecord> records, 2568 ArrayList<Boolean> isRecordPop, int startIndex, int endIndex) { 2569 for (int i = startIndex; i < endIndex; i++) { 2570 final BackStackRecord record = records.get(i); 2571 final boolean isPop = isRecordPop.get(i); 2572 if (isPop) { 2573 record.bumpBackStackNesting(-1); 2574 // Only execute the add operations at the end of 2575 // all transactions. 2576 boolean moveToState = i == (endIndex - 1); 2577 record.executePopOps(moveToState); 2578 } else { 2579 record.bumpBackStackNesting(1); 2580 record.executeOps(); 2581 } 2582 } 2583 } 2584 2585 /** 2586 * Ensure that fragments that are added are moved to at least the CREATED state. 2587 * Any newly-added Views are inserted into {@code added} so that the Transaction can be 2588 * postponed with {@link Fragment#postponeEnterTransition()}. They will later be made 2589 * invisible (by setting their alpha to 0) if they have been removed when postponed. 2590 */ 2591 private void addAddedFragments(ArraySet<Fragment> added) { 2592 if (mCurState < Fragment.CREATED) { 2593 return; 2594 } 2595 // We want to leave the fragment in the started state 2596 final int state = Math.min(mCurState, Fragment.STARTED); 2597 final int numAdded = mAdded.size(); 2598 for (int i = 0; i < numAdded; i++) { 2599 Fragment fragment = mAdded.get(i); 2600 if (fragment.mState < state) { 2601 moveToState(fragment, state, fragment.getNextAnim(), fragment.getNextTransition(), 2602 false); 2603 if (fragment.mView != null && !fragment.mHidden && fragment.mIsNewlyAdded) { 2604 added.add(fragment); 2605 } 2606 } 2607 } 2608 } 2609 2610 /** 2611 * Starts all postponed transactions regardless of whether they are ready or not. 2612 */ 2613 private void forcePostponedTransactions() { 2614 if (mPostponedTransactions != null) { 2615 while (!mPostponedTransactions.isEmpty()) { 2616 mPostponedTransactions.remove(0).completeTransaction(); 2617 } 2618 } 2619 } 2620 2621 /** 2622 * Ends the animations of fragments so that they immediately reach the end state. 2623 * This is used prior to saving the state so that the correct state is saved. 2624 */ 2625 private void endAnimatingAwayFragments() { 2626 final int numFragments = mActive == null ? 0 : mActive.size(); 2627 for (int i = 0; i < numFragments; i++) { 2628 Fragment fragment = mActive.valueAt(i); 2629 if (fragment != null) { 2630 if (fragment.getAnimatingAway() != null) { 2631 // Give up waiting for the animation and just end it. 2632 final int stateAfterAnimating = fragment.getStateAfterAnimating(); 2633 final View animatingAway = fragment.getAnimatingAway(); 2634 fragment.setAnimatingAway(null); 2635 Animation animation = animatingAway.getAnimation(); 2636 if (animation != null) { 2637 animation.cancel(); 2638 // force-clear the animation, as Animation#cancel() doesn't work prior to N, 2639 // and will instead cause the animation to infinitely loop 2640 animatingAway.clearAnimation(); 2641 } 2642 moveToState(fragment, stateAfterAnimating, 0, 0, false); 2643 } else if (fragment.getAnimator() != null) { 2644 fragment.getAnimator().end(); 2645 } 2646 } 2647 } 2648 } 2649 2650 /** 2651 * Adds all records in the pending actions to records and whether they are add or pop 2652 * operations to isPop. After executing, the pending actions will be empty. 2653 * 2654 * @param records All pending actions will generate BackStackRecords added to this. 2655 * This contains the transactions, in order, to execute. 2656 * @param isPop All pending actions will generate booleans to add to this. This contains 2657 * an entry for each entry in records to indicate whether or not it is a 2658 * pop action. 2659 */ 2660 private boolean generateOpsForPendingActions(ArrayList<BackStackRecord> records, 2661 ArrayList<Boolean> isPop) { 2662 boolean didSomething = false; 2663 synchronized (this) { 2664 if (mPendingActions == null || mPendingActions.size() == 0) { 2665 return false; 2666 } 2667 2668 final int numActions = mPendingActions.size(); 2669 for (int i = 0; i < numActions; i++) { 2670 didSomething |= mPendingActions.get(i).generateOps(records, isPop); 2671 } 2672 mPendingActions.clear(); 2673 mHost.getHandler().removeCallbacks(mExecCommit); 2674 } 2675 return didSomething; 2676 } 2677 2678 void doPendingDeferredStart() { 2679 if (mHavePendingDeferredStart) { 2680 boolean loadersRunning = false; 2681 for (int i = 0; i < mActive.size(); i++) { 2682 Fragment f = mActive.valueAt(i); 2683 if (f != null && f.mLoaderManager != null) { 2684 loadersRunning |= f.mLoaderManager.hasRunningLoaders(); 2685 } 2686 } 2687 if (!loadersRunning) { 2688 mHavePendingDeferredStart = false; 2689 startPendingDeferredFragments(); 2690 } 2691 } 2692 } 2693 2694 void reportBackStackChanged() { 2695 if (mBackStackChangeListeners != null) { 2696 for (int i=0; i<mBackStackChangeListeners.size(); i++) { 2697 mBackStackChangeListeners.get(i).onBackStackChanged(); 2698 } 2699 } 2700 } 2701 2702 void addBackStackState(BackStackRecord state) { 2703 if (mBackStack == null) { 2704 mBackStack = new ArrayList<BackStackRecord>(); 2705 } 2706 mBackStack.add(state); 2707 } 2708 2709 @SuppressWarnings("unused") 2710 boolean popBackStackState(ArrayList<BackStackRecord> records, ArrayList<Boolean> isRecordPop, 2711 String name, int id, int flags) { 2712 if (mBackStack == null) { 2713 return false; 2714 } 2715 if (name == null && id < 0 && (flags & POP_BACK_STACK_INCLUSIVE) == 0) { 2716 int last = mBackStack.size() - 1; 2717 if (last < 0) { 2718 return false; 2719 } 2720 records.add(mBackStack.remove(last)); 2721 isRecordPop.add(true); 2722 } else { 2723 int index = -1; 2724 if (name != null || id >= 0) { 2725 // If a name or ID is specified, look for that place in 2726 // the stack. 2727 index = mBackStack.size()-1; 2728 while (index >= 0) { 2729 BackStackRecord bss = mBackStack.get(index); 2730 if (name != null && name.equals(bss.getName())) { 2731 break; 2732 } 2733 if (id >= 0 && id == bss.mIndex) { 2734 break; 2735 } 2736 index--; 2737 } 2738 if (index < 0) { 2739 return false; 2740 } 2741 if ((flags&POP_BACK_STACK_INCLUSIVE) != 0) { 2742 index--; 2743 // Consume all following entries that match. 2744 while (index >= 0) { 2745 BackStackRecord bss = mBackStack.get(index); 2746 if ((name != null && name.equals(bss.getName())) 2747 || (id >= 0 && id == bss.mIndex)) { 2748 index--; 2749 continue; 2750 } 2751 break; 2752 } 2753 } 2754 } 2755 if (index == mBackStack.size()-1) { 2756 return false; 2757 } 2758 for (int i = mBackStack.size() - 1; i > index; i--) { 2759 records.add(mBackStack.remove(i)); 2760 isRecordPop.add(true); 2761 } 2762 } 2763 return true; 2764 } 2765 2766 FragmentManagerNonConfig retainNonConfig() { 2767 setRetaining(mSavedNonConfig); 2768 return mSavedNonConfig; 2769 } 2770 2771 /** 2772 * Recurse the FragmentManagerNonConfig fragments and set the mRetaining to true. This 2773 * was previously done while saving the non-config state, but that has been moved to 2774 * {@link #saveNonConfig()} called from {@link #saveAllState()}. If mRetaining is set too 2775 * early, the fragment won't be destroyed when the FragmentManager is destroyed. 2776 */ 2777 private static void setRetaining(FragmentManagerNonConfig nonConfig) { 2778 if (nonConfig == null) { 2779 return; 2780 } 2781 List<Fragment> fragments = nonConfig.getFragments(); 2782 if (fragments != null) { 2783 for (Fragment fragment : fragments) { 2784 fragment.mRetaining = true; 2785 } 2786 } 2787 List<FragmentManagerNonConfig> children = nonConfig.getChildNonConfigs(); 2788 if (children != null) { 2789 for (FragmentManagerNonConfig child : children) { 2790 setRetaining(child); 2791 } 2792 } 2793 } 2794 2795 void saveNonConfig() { 2796 ArrayList<Fragment> fragments = null; 2797 ArrayList<FragmentManagerNonConfig> childFragments = null; 2798 if (mActive != null) { 2799 for (int i=0; i<mActive.size(); i++) { 2800 Fragment f = mActive.valueAt(i); 2801 if (f != null) { 2802 if (f.mRetainInstance) { 2803 if (fragments == null) { 2804 fragments = new ArrayList<Fragment>(); 2805 } 2806 fragments.add(f); 2807 f.mTargetIndex = f.mTarget != null ? f.mTarget.mIndex : -1; 2808 if (DEBUG) Log.v(TAG, "retainNonConfig: keeping retained " + f); 2809 } 2810 FragmentManagerNonConfig child; 2811 if (f.mChildFragmentManager != null) { 2812 f.mChildFragmentManager.saveNonConfig(); 2813 child = f.mChildFragmentManager.mSavedNonConfig; 2814 } else { 2815 // f.mChildNonConfig may be not null, when the parent fragment is 2816 // in the backstack. 2817 child = f.mChildNonConfig; 2818 } 2819 2820 if (childFragments == null && child != null) { 2821 childFragments = new ArrayList<>(mActive.size()); 2822 for (int j = 0; j < i; j++) { 2823 childFragments.add(null); 2824 } 2825 } 2826 2827 if (childFragments != null) { 2828 childFragments.add(child); 2829 } 2830 } 2831 } 2832 } 2833 if (fragments == null && childFragments == null) { 2834 mSavedNonConfig = null; 2835 } else { 2836 mSavedNonConfig = new FragmentManagerNonConfig(fragments, childFragments); 2837 } 2838 } 2839 2840 void saveFragmentViewState(Fragment f) { 2841 if (f.mInnerView == null) { 2842 return; 2843 } 2844 if (mStateArray == null) { 2845 mStateArray = new SparseArray<Parcelable>(); 2846 } else { 2847 mStateArray.clear(); 2848 } 2849 f.mInnerView.saveHierarchyState(mStateArray); 2850 if (mStateArray.size() > 0) { 2851 f.mSavedViewState = mStateArray; 2852 mStateArray = null; 2853 } 2854 } 2855 2856 Bundle saveFragmentBasicState(Fragment f) { 2857 Bundle result = null; 2858 2859 if (mStateBundle == null) { 2860 mStateBundle = new Bundle(); 2861 } 2862 f.performSaveInstanceState(mStateBundle); 2863 dispatchOnFragmentSaveInstanceState(f, mStateBundle, false); 2864 if (!mStateBundle.isEmpty()) { 2865 result = mStateBundle; 2866 mStateBundle = null; 2867 } 2868 2869 if (f.mView != null) { 2870 saveFragmentViewState(f); 2871 } 2872 if (f.mSavedViewState != null) { 2873 if (result == null) { 2874 result = new Bundle(); 2875 } 2876 result.putSparseParcelableArray( 2877 FragmentManagerImpl.VIEW_STATE_TAG, f.mSavedViewState); 2878 } 2879 if (!f.mUserVisibleHint) { 2880 if (result == null) { 2881 result = new Bundle(); 2882 } 2883 // Only add this if it's not the default value 2884 result.putBoolean(FragmentManagerImpl.USER_VISIBLE_HINT_TAG, f.mUserVisibleHint); 2885 } 2886 2887 return result; 2888 } 2889 2890 Parcelable saveAllState() { 2891 // Make sure all pending operations have now been executed to get 2892 // our state update-to-date. 2893 forcePostponedTransactions(); 2894 endAnimatingAwayFragments(); 2895 execPendingActions(); 2896 2897 mStateSaved = true; 2898 mSavedNonConfig = null; 2899 2900 if (mActive == null || mActive.size() <= 0) { 2901 return null; 2902 } 2903 2904 // First collect all active fragments. 2905 int N = mActive.size(); 2906 FragmentState[] active = new FragmentState[N]; 2907 boolean haveFragments = false; 2908 for (int i=0; i<N; i++) { 2909 Fragment f = mActive.valueAt(i); 2910 if (f != null) { 2911 if (f.mIndex < 0) { 2912 throwException(new IllegalStateException( 2913 "Failure saving state: active " + f 2914 + " has cleared index: " + f.mIndex)); 2915 } 2916 2917 haveFragments = true; 2918 2919 FragmentState fs = new FragmentState(f); 2920 active[i] = fs; 2921 2922 if (f.mState > Fragment.INITIALIZING && fs.mSavedFragmentState == null) { 2923 fs.mSavedFragmentState = saveFragmentBasicState(f); 2924 2925 if (f.mTarget != null) { 2926 if (f.mTarget.mIndex < 0) { 2927 throwException(new IllegalStateException( 2928 "Failure saving state: " + f 2929 + " has target not in fragment manager: " + f.mTarget)); 2930 } 2931 if (fs.mSavedFragmentState == null) { 2932 fs.mSavedFragmentState = new Bundle(); 2933 } 2934 putFragment(fs.mSavedFragmentState, 2935 FragmentManagerImpl.TARGET_STATE_TAG, f.mTarget); 2936 if (f.mTargetRequestCode != 0) { 2937 fs.mSavedFragmentState.putInt( 2938 FragmentManagerImpl.TARGET_REQUEST_CODE_STATE_TAG, 2939 f.mTargetRequestCode); 2940 } 2941 } 2942 2943 } else { 2944 fs.mSavedFragmentState = f.mSavedFragmentState; 2945 } 2946 2947 if (DEBUG) Log.v(TAG, "Saved state of " + f + ": " 2948 + fs.mSavedFragmentState); 2949 } 2950 } 2951 2952 if (!haveFragments) { 2953 if (DEBUG) Log.v(TAG, "saveAllState: no fragments!"); 2954 return null; 2955 } 2956 2957 int[] added = null; 2958 BackStackState[] backStack = null; 2959 2960 // Build list of currently added fragments. 2961 N = mAdded.size(); 2962 if (N > 0) { 2963 added = new int[N]; 2964 for (int i = 0; i < N; i++) { 2965 added[i] = mAdded.get(i).mIndex; 2966 if (added[i] < 0) { 2967 throwException(new IllegalStateException( 2968 "Failure saving state: active " + mAdded.get(i) 2969 + " has cleared index: " + added[i])); 2970 } 2971 if (DEBUG) { 2972 Log.v(TAG, "saveAllState: adding fragment #" + i 2973 + ": " + mAdded.get(i)); 2974 } 2975 } 2976 } 2977 2978 // Now save back stack. 2979 if (mBackStack != null) { 2980 N = mBackStack.size(); 2981 if (N > 0) { 2982 backStack = new BackStackState[N]; 2983 for (int i=0; i<N; i++) { 2984 backStack[i] = new BackStackState(mBackStack.get(i)); 2985 if (DEBUG) Log.v(TAG, "saveAllState: adding back stack #" + i 2986 + ": " + mBackStack.get(i)); 2987 } 2988 } 2989 } 2990 2991 FragmentManagerState fms = new FragmentManagerState(); 2992 fms.mActive = active; 2993 fms.mAdded = added; 2994 fms.mBackStack = backStack; 2995 if (mPrimaryNav != null) { 2996 fms.mPrimaryNavActiveIndex = mPrimaryNav.mIndex; 2997 } 2998 fms.mNextFragmentIndex = mNextFragmentIndex; 2999 saveNonConfig(); 3000 return fms; 3001 } 3002 3003 void restoreAllState(Parcelable state, FragmentManagerNonConfig nonConfig) { 3004 // If there is no saved state at all, then there can not be 3005 // any nonConfig fragments either, so that is that. 3006 if (state == null) return; 3007 FragmentManagerState fms = (FragmentManagerState)state; 3008 if (fms.mActive == null) return; 3009 3010 List<FragmentManagerNonConfig> childNonConfigs = null; 3011 3012 // First re-attach any non-config instances we are retaining back 3013 // to their saved state, so we don't try to instantiate them again. 3014 if (nonConfig != null) { 3015 List<Fragment> nonConfigFragments = nonConfig.getFragments(); 3016 childNonConfigs = nonConfig.getChildNonConfigs(); 3017 final int count = nonConfigFragments != null ? nonConfigFragments.size() : 0; 3018 for (int i = 0; i < count; i++) { 3019 Fragment f = nonConfigFragments.get(i); 3020 if (DEBUG) Log.v(TAG, "restoreAllState: re-attaching retained " + f); 3021 int index = 0; // index into fms.mActive 3022 while (index < fms.mActive.length && fms.mActive[index].mIndex != f.mIndex) { 3023 index++; 3024 } 3025 if (index == fms.mActive.length) { 3026 throwException(new IllegalStateException("Could not find active fragment " 3027 + "with index " + f.mIndex)); 3028 } 3029 FragmentState fs = fms.mActive[index]; 3030 fs.mInstance = f; 3031 f.mSavedViewState = null; 3032 f.mBackStackNesting = 0; 3033 f.mInLayout = false; 3034 f.mAdded = false; 3035 f.mTarget = null; 3036 if (fs.mSavedFragmentState != null) { 3037 fs.mSavedFragmentState.setClassLoader(mHost.getContext().getClassLoader()); 3038 f.mSavedViewState = fs.mSavedFragmentState.getSparseParcelableArray( 3039 FragmentManagerImpl.VIEW_STATE_TAG); 3040 f.mSavedFragmentState = fs.mSavedFragmentState; 3041 } 3042 } 3043 } 3044 3045 // Build the full list of active fragments, instantiating them from 3046 // their saved state. 3047 mActive = new SparseArray<>(fms.mActive.length); 3048 for (int i=0; i<fms.mActive.length; i++) { 3049 FragmentState fs = fms.mActive[i]; 3050 if (fs != null) { 3051 FragmentManagerNonConfig childNonConfig = null; 3052 if (childNonConfigs != null && i < childNonConfigs.size()) { 3053 childNonConfig = childNonConfigs.get(i); 3054 } 3055 Fragment f = fs.instantiate(mHost, mContainer, mParent, childNonConfig); 3056 if (DEBUG) Log.v(TAG, "restoreAllState: active #" + i + ": " + f); 3057 mActive.put(f.mIndex, f); 3058 // Now that the fragment is instantiated (or came from being 3059 // retained above), clear mInstance in case we end up re-restoring 3060 // from this FragmentState again. 3061 fs.mInstance = null; 3062 } 3063 } 3064 3065 // Update the target of all retained fragments. 3066 if (nonConfig != null) { 3067 List<Fragment> nonConfigFragments = nonConfig.getFragments(); 3068 final int count = nonConfigFragments != null ? nonConfigFragments.size() : 0; 3069 for (int i = 0; i < count; i++) { 3070 Fragment f = nonConfigFragments.get(i); 3071 if (f.mTargetIndex >= 0) { 3072 f.mTarget = mActive.get(f.mTargetIndex); 3073 if (f.mTarget == null) { 3074 Log.w(TAG, "Re-attaching retained fragment " + f 3075 + " target no longer exists: " + f.mTargetIndex); 3076 } 3077 } 3078 } 3079 } 3080 3081 // Build the list of currently added fragments. 3082 mAdded.clear(); 3083 if (fms.mAdded != null) { 3084 for (int i=0; i<fms.mAdded.length; i++) { 3085 Fragment f = mActive.get(fms.mAdded[i]); 3086 if (f == null) { 3087 throwException(new IllegalStateException( 3088 "No instantiated fragment for index #" + fms.mAdded[i])); 3089 } 3090 f.mAdded = true; 3091 if (DEBUG) Log.v(TAG, "restoreAllState: added #" + i + ": " + f); 3092 if (mAdded.contains(f)) { 3093 throw new IllegalStateException("Already added!"); 3094 } 3095 synchronized (mAdded) { 3096 mAdded.add(f); 3097 } 3098 } 3099 } 3100 3101 // Build the back stack. 3102 if (fms.mBackStack != null) { 3103 mBackStack = new ArrayList<BackStackRecord>(fms.mBackStack.length); 3104 for (int i=0; i<fms.mBackStack.length; i++) { 3105 BackStackRecord bse = fms.mBackStack[i].instantiate(this); 3106 if (DEBUG) { 3107 Log.v(TAG, "restoreAllState: back stack #" + i 3108 + " (index " + bse.mIndex + "): " + bse); 3109 LogWriter logw = new LogWriter(TAG); 3110 PrintWriter pw = new PrintWriter(logw); 3111 bse.dump(" ", pw, false); 3112 pw.close(); 3113 } 3114 mBackStack.add(bse); 3115 if (bse.mIndex >= 0) { 3116 setBackStackIndex(bse.mIndex, bse); 3117 } 3118 } 3119 } else { 3120 mBackStack = null; 3121 } 3122 3123 if (fms.mPrimaryNavActiveIndex >= 0) { 3124 mPrimaryNav = mActive.get(fms.mPrimaryNavActiveIndex); 3125 } 3126 this.mNextFragmentIndex = fms.mNextFragmentIndex; 3127 } 3128 3129 /** 3130 * To prevent list modification errors, mActive sets values to null instead of 3131 * removing them when the Fragment becomes inactive. This cleans up the list at the 3132 * end of executing the transactions. 3133 */ 3134 private void burpActive() { 3135 if (mActive != null) { 3136 for (int i = mActive.size() - 1; i >= 0; i--) { 3137 if (mActive.valueAt(i) == null) { 3138 mActive.delete(mActive.keyAt(i)); 3139 } 3140 } 3141 } 3142 } 3143 3144 public void attachController(FragmentHostCallback host, 3145 FragmentContainer container, Fragment parent) { 3146 if (mHost != null) throw new IllegalStateException("Already attached"); 3147 mHost = host; 3148 mContainer = container; 3149 mParent = parent; 3150 } 3151 3152 public void noteStateNotSaved() { 3153 mSavedNonConfig = null; 3154 mStateSaved = false; 3155 final int addedCount = mAdded.size(); 3156 for (int i = 0; i < addedCount; i++) { 3157 Fragment fragment = mAdded.get(i); 3158 if (fragment != null) { 3159 fragment.noteStateNotSaved(); 3160 } 3161 } 3162 } 3163 3164 public void dispatchCreate() { 3165 mStateSaved = false; 3166 dispatchStateChange(Fragment.CREATED); 3167 } 3168 3169 public void dispatchActivityCreated() { 3170 mStateSaved = false; 3171 dispatchStateChange(Fragment.ACTIVITY_CREATED); 3172 } 3173 3174 public void dispatchStart() { 3175 mStateSaved = false; 3176 dispatchStateChange(Fragment.STARTED); 3177 } 3178 3179 public void dispatchResume() { 3180 mStateSaved = false; 3181 dispatchStateChange(Fragment.RESUMED); 3182 } 3183 3184 public void dispatchPause() { 3185 dispatchStateChange(Fragment.STARTED); 3186 } 3187 3188 public void dispatchStop() { 3189 // See saveAllState() for the explanation of this. We do this for 3190 // all platform versions, to keep our behavior more consistent between 3191 // them. 3192 mStateSaved = true; 3193 3194 dispatchStateChange(Fragment.STOPPED); 3195 } 3196 3197 public void dispatchReallyStop() { 3198 dispatchStateChange(Fragment.ACTIVITY_CREATED); 3199 } 3200 3201 public void dispatchDestroyView() { 3202 dispatchStateChange(Fragment.CREATED); 3203 } 3204 3205 public void dispatchDestroy() { 3206 mDestroyed = true; 3207 execPendingActions(); 3208 dispatchStateChange(Fragment.INITIALIZING); 3209 mHost = null; 3210 mContainer = null; 3211 mParent = null; 3212 } 3213 3214 private void dispatchStateChange(int nextState) { 3215 try { 3216 mExecutingActions = true; 3217 moveToState(nextState, false); 3218 } finally { 3219 mExecutingActions = false; 3220 } 3221 execPendingActions(); 3222 } 3223 3224 public void dispatchMultiWindowModeChanged(boolean isInMultiWindowMode) { 3225 for (int i = mAdded.size() - 1; i >= 0; --i) { 3226 final android.support.v4.app.Fragment f = mAdded.get(i); 3227 if (f != null) { 3228 f.performMultiWindowModeChanged(isInMultiWindowMode); 3229 } 3230 } 3231 } 3232 3233 public void dispatchPictureInPictureModeChanged(boolean isInPictureInPictureMode) { 3234 for (int i = mAdded.size() - 1; i >= 0; --i) { 3235 final android.support.v4.app.Fragment f = mAdded.get(i); 3236 if (f != null) { 3237 f.performPictureInPictureModeChanged(isInPictureInPictureMode); 3238 } 3239 } 3240 } 3241 3242 public void dispatchConfigurationChanged(Configuration newConfig) { 3243 for (int i = 0; i < mAdded.size(); i++) { 3244 Fragment f = mAdded.get(i); 3245 if (f != null) { 3246 f.performConfigurationChanged(newConfig); 3247 } 3248 } 3249 } 3250 3251 public void dispatchLowMemory() { 3252 for (int i = 0; i < mAdded.size(); i++) { 3253 Fragment f = mAdded.get(i); 3254 if (f != null) { 3255 f.performLowMemory(); 3256 } 3257 } 3258 } 3259 3260 public boolean dispatchCreateOptionsMenu(Menu menu, MenuInflater inflater) { 3261 if (mCurState < Fragment.CREATED) { 3262 return false; 3263 } 3264 boolean show = false; 3265 ArrayList<Fragment> newMenus = null; 3266 for (int i = 0; i < mAdded.size(); i++) { 3267 Fragment f = mAdded.get(i); 3268 if (f != null) { 3269 if (f.performCreateOptionsMenu(menu, inflater)) { 3270 show = true; 3271 if (newMenus == null) { 3272 newMenus = new ArrayList<Fragment>(); 3273 } 3274 newMenus.add(f); 3275 } 3276 } 3277 } 3278 3279 if (mCreatedMenus != null) { 3280 for (int i=0; i<mCreatedMenus.size(); i++) { 3281 Fragment f = mCreatedMenus.get(i); 3282 if (newMenus == null || !newMenus.contains(f)) { 3283 f.onDestroyOptionsMenu(); 3284 } 3285 } 3286 } 3287 3288 mCreatedMenus = newMenus; 3289 3290 return show; 3291 } 3292 3293 public boolean dispatchPrepareOptionsMenu(Menu menu) { 3294 if (mCurState < Fragment.CREATED) { 3295 return false; 3296 } 3297 boolean show = false; 3298 for (int i = 0; i < mAdded.size(); i++) { 3299 Fragment f = mAdded.get(i); 3300 if (f != null) { 3301 if (f.performPrepareOptionsMenu(menu)) { 3302 show = true; 3303 } 3304 } 3305 } 3306 return show; 3307 } 3308 3309 public boolean dispatchOptionsItemSelected(MenuItem item) { 3310 if (mCurState < Fragment.CREATED) { 3311 return false; 3312 } 3313 for (int i = 0; i < mAdded.size(); i++) { 3314 Fragment f = mAdded.get(i); 3315 if (f != null) { 3316 if (f.performOptionsItemSelected(item)) { 3317 return true; 3318 } 3319 } 3320 } 3321 return false; 3322 } 3323 3324 public boolean dispatchContextItemSelected(MenuItem item) { 3325 if (mCurState < Fragment.CREATED) { 3326 return false; 3327 } 3328 for (int i = 0; i < mAdded.size(); i++) { 3329 Fragment f = mAdded.get(i); 3330 if (f != null) { 3331 if (f.performContextItemSelected(item)) { 3332 return true; 3333 } 3334 } 3335 } 3336 return false; 3337 } 3338 3339 public void dispatchOptionsMenuClosed(Menu menu) { 3340 if (mCurState < Fragment.CREATED) { 3341 return; 3342 } 3343 for (int i = 0; i < mAdded.size(); i++) { 3344 Fragment f = mAdded.get(i); 3345 if (f != null) { 3346 f.performOptionsMenuClosed(menu); 3347 } 3348 } 3349 } 3350 3351 @SuppressWarnings("ReferenceEquality") 3352 public void setPrimaryNavigationFragment(Fragment f) { 3353 if (f != null && (mActive.get(f.mIndex) != f 3354 || (f.mHost != null && f.getFragmentManager() != this))) { 3355 throw new IllegalArgumentException("Fragment " + f 3356 + " is not an active fragment of FragmentManager " + this); 3357 } 3358 mPrimaryNav = f; 3359 } 3360 3361 @Override 3362 public Fragment getPrimaryNavigationFragment() { 3363 return mPrimaryNav; 3364 } 3365 3366 @Override 3367 public void registerFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb, 3368 boolean recursive) { 3369 mLifecycleCallbacks.add(new Pair<>(cb, recursive)); 3370 } 3371 3372 @Override 3373 public void unregisterFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb) { 3374 synchronized (mLifecycleCallbacks) { 3375 for (int i = 0, N = mLifecycleCallbacks.size(); i < N; i++) { 3376 if (mLifecycleCallbacks.get(i).first == cb) { 3377 mLifecycleCallbacks.remove(i); 3378 break; 3379 } 3380 } 3381 } 3382 } 3383 3384 void dispatchOnFragmentPreAttached(Fragment f, Context context, boolean onlyRecursive) { 3385 if (mParent != null) { 3386 FragmentManager parentManager = mParent.getFragmentManager(); 3387 if (parentManager instanceof FragmentManagerImpl) { 3388 ((FragmentManagerImpl) parentManager) 3389 .dispatchOnFragmentPreAttached(f, context, true); 3390 } 3391 } 3392 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3393 if (!onlyRecursive || p.second) { 3394 p.first.onFragmentPreAttached(this, f, context); 3395 } 3396 } 3397 } 3398 3399 void dispatchOnFragmentAttached(Fragment f, Context context, boolean onlyRecursive) { 3400 if (mParent != null) { 3401 FragmentManager parentManager = mParent.getFragmentManager(); 3402 if (parentManager instanceof FragmentManagerImpl) { 3403 ((FragmentManagerImpl) parentManager) 3404 .dispatchOnFragmentAttached(f, context, true); 3405 } 3406 } 3407 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3408 if (!onlyRecursive || p.second) { 3409 p.first.onFragmentAttached(this, f, context); 3410 } 3411 } 3412 } 3413 3414 void dispatchOnFragmentPreCreated(Fragment f, Bundle savedInstanceState, 3415 boolean onlyRecursive) { 3416 if (mParent != null) { 3417 FragmentManager parentManager = mParent.getFragmentManager(); 3418 if (parentManager instanceof FragmentManagerImpl) { 3419 ((FragmentManagerImpl) parentManager) 3420 .dispatchOnFragmentPreCreated(f, savedInstanceState, true); 3421 } 3422 } 3423 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3424 if (!onlyRecursive || p.second) { 3425 p.first.onFragmentPreCreated(this, f, savedInstanceState); 3426 } 3427 } 3428 } 3429 3430 void dispatchOnFragmentCreated(Fragment f, Bundle savedInstanceState, boolean onlyRecursive) { 3431 if (mParent != null) { 3432 FragmentManager parentManager = mParent.getFragmentManager(); 3433 if (parentManager instanceof FragmentManagerImpl) { 3434 ((FragmentManagerImpl) parentManager) 3435 .dispatchOnFragmentCreated(f, savedInstanceState, true); 3436 } 3437 } 3438 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3439 if (!onlyRecursive || p.second) { 3440 p.first.onFragmentCreated(this, f, savedInstanceState); 3441 } 3442 } 3443 } 3444 3445 void dispatchOnFragmentActivityCreated(Fragment f, Bundle savedInstanceState, 3446 boolean onlyRecursive) { 3447 if (mParent != null) { 3448 FragmentManager parentManager = mParent.getFragmentManager(); 3449 if (parentManager instanceof FragmentManagerImpl) { 3450 ((FragmentManagerImpl) parentManager) 3451 .dispatchOnFragmentActivityCreated(f, savedInstanceState, true); 3452 } 3453 } 3454 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3455 if (!onlyRecursive || p.second) { 3456 p.first.onFragmentActivityCreated(this, f, savedInstanceState); 3457 } 3458 } 3459 } 3460 3461 void dispatchOnFragmentViewCreated(Fragment f, View v, Bundle savedInstanceState, 3462 boolean onlyRecursive) { 3463 if (mParent != null) { 3464 FragmentManager parentManager = mParent.getFragmentManager(); 3465 if (parentManager instanceof FragmentManagerImpl) { 3466 ((FragmentManagerImpl) parentManager) 3467 .dispatchOnFragmentViewCreated(f, v, savedInstanceState, true); 3468 } 3469 } 3470 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3471 if (!onlyRecursive || p.second) { 3472 p.first.onFragmentViewCreated(this, f, v, savedInstanceState); 3473 } 3474 } 3475 } 3476 3477 void dispatchOnFragmentStarted(Fragment f, boolean onlyRecursive) { 3478 if (mParent != null) { 3479 FragmentManager parentManager = mParent.getFragmentManager(); 3480 if (parentManager instanceof FragmentManagerImpl) { 3481 ((FragmentManagerImpl) parentManager) 3482 .dispatchOnFragmentStarted(f, true); 3483 } 3484 } 3485 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3486 if (!onlyRecursive || p.second) { 3487 p.first.onFragmentStarted(this, f); 3488 } 3489 } 3490 } 3491 3492 void dispatchOnFragmentResumed(Fragment f, boolean onlyRecursive) { 3493 if (mParent != null) { 3494 FragmentManager parentManager = mParent.getFragmentManager(); 3495 if (parentManager instanceof FragmentManagerImpl) { 3496 ((FragmentManagerImpl) parentManager) 3497 .dispatchOnFragmentResumed(f, true); 3498 } 3499 } 3500 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3501 if (!onlyRecursive || p.second) { 3502 p.first.onFragmentResumed(this, f); 3503 } 3504 } 3505 } 3506 3507 void dispatchOnFragmentPaused(Fragment f, boolean onlyRecursive) { 3508 if (mParent != null) { 3509 FragmentManager parentManager = mParent.getFragmentManager(); 3510 if (parentManager instanceof FragmentManagerImpl) { 3511 ((FragmentManagerImpl) parentManager) 3512 .dispatchOnFragmentPaused(f, true); 3513 } 3514 } 3515 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3516 if (!onlyRecursive || p.second) { 3517 p.first.onFragmentPaused(this, f); 3518 } 3519 } 3520 } 3521 3522 void dispatchOnFragmentStopped(Fragment f, boolean onlyRecursive) { 3523 if (mParent != null) { 3524 FragmentManager parentManager = mParent.getFragmentManager(); 3525 if (parentManager instanceof FragmentManagerImpl) { 3526 ((FragmentManagerImpl) parentManager) 3527 .dispatchOnFragmentStopped(f, true); 3528 } 3529 } 3530 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3531 if (!onlyRecursive || p.second) { 3532 p.first.onFragmentStopped(this, f); 3533 } 3534 } 3535 } 3536 3537 void dispatchOnFragmentSaveInstanceState(Fragment f, Bundle outState, boolean onlyRecursive) { 3538 if (mParent != null) { 3539 FragmentManager parentManager = mParent.getFragmentManager(); 3540 if (parentManager instanceof FragmentManagerImpl) { 3541 ((FragmentManagerImpl) parentManager) 3542 .dispatchOnFragmentSaveInstanceState(f, outState, true); 3543 } 3544 } 3545 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3546 if (!onlyRecursive || p.second) { 3547 p.first.onFragmentSaveInstanceState(this, f, outState); 3548 } 3549 } 3550 } 3551 3552 void dispatchOnFragmentViewDestroyed(Fragment f, boolean onlyRecursive) { 3553 if (mParent != null) { 3554 FragmentManager parentManager = mParent.getFragmentManager(); 3555 if (parentManager instanceof FragmentManagerImpl) { 3556 ((FragmentManagerImpl) parentManager) 3557 .dispatchOnFragmentViewDestroyed(f, true); 3558 } 3559 } 3560 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3561 if (!onlyRecursive || p.second) { 3562 p.first.onFragmentViewDestroyed(this, f); 3563 } 3564 } 3565 } 3566 3567 void dispatchOnFragmentDestroyed(Fragment f, boolean onlyRecursive) { 3568 if (mParent != null) { 3569 FragmentManager parentManager = mParent.getFragmentManager(); 3570 if (parentManager instanceof FragmentManagerImpl) { 3571 ((FragmentManagerImpl) parentManager) 3572 .dispatchOnFragmentDestroyed(f, true); 3573 } 3574 } 3575 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3576 if (!onlyRecursive || p.second) { 3577 p.first.onFragmentDestroyed(this, f); 3578 } 3579 } 3580 } 3581 3582 void dispatchOnFragmentDetached(Fragment f, boolean onlyRecursive) { 3583 if (mParent != null) { 3584 FragmentManager parentManager = mParent.getFragmentManager(); 3585 if (parentManager instanceof FragmentManagerImpl) { 3586 ((FragmentManagerImpl) parentManager) 3587 .dispatchOnFragmentDetached(f, true); 3588 } 3589 } 3590 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3591 if (!onlyRecursive || p.second) { 3592 p.first.onFragmentDetached(this, f); 3593 } 3594 } 3595 } 3596 3597 public static int reverseTransit(int transit) { 3598 int rev = 0; 3599 switch (transit) { 3600 case FragmentTransaction.TRANSIT_FRAGMENT_OPEN: 3601 rev = FragmentTransaction.TRANSIT_FRAGMENT_CLOSE; 3602 break; 3603 case FragmentTransaction.TRANSIT_FRAGMENT_CLOSE: 3604 rev = FragmentTransaction.TRANSIT_FRAGMENT_OPEN; 3605 break; 3606 case FragmentTransaction.TRANSIT_FRAGMENT_FADE: 3607 rev = FragmentTransaction.TRANSIT_FRAGMENT_FADE; 3608 break; 3609 } 3610 return rev; 3611 3612 } 3613 3614 public static final int ANIM_STYLE_OPEN_ENTER = 1; 3615 public static final int ANIM_STYLE_OPEN_EXIT = 2; 3616 public static final int ANIM_STYLE_CLOSE_ENTER = 3; 3617 public static final int ANIM_STYLE_CLOSE_EXIT = 4; 3618 public static final int ANIM_STYLE_FADE_ENTER = 5; 3619 public static final int ANIM_STYLE_FADE_EXIT = 6; 3620 3621 public static int transitToStyleIndex(int transit, boolean enter) { 3622 int animAttr = -1; 3623 switch (transit) { 3624 case FragmentTransaction.TRANSIT_FRAGMENT_OPEN: 3625 animAttr = enter ? ANIM_STYLE_OPEN_ENTER : ANIM_STYLE_OPEN_EXIT; 3626 break; 3627 case FragmentTransaction.TRANSIT_FRAGMENT_CLOSE: 3628 animAttr = enter ? ANIM_STYLE_CLOSE_ENTER : ANIM_STYLE_CLOSE_EXIT; 3629 break; 3630 case FragmentTransaction.TRANSIT_FRAGMENT_FADE: 3631 animAttr = enter ? ANIM_STYLE_FADE_ENTER : ANIM_STYLE_FADE_EXIT; 3632 break; 3633 } 3634 return animAttr; 3635 } 3636 3637 @Override 3638 public View onCreateView(View parent, String name, Context context, AttributeSet attrs) { 3639 if (!"fragment".equals(name)) { 3640 return null; 3641 } 3642 3643 String fname = attrs.getAttributeValue(null, "class"); 3644 TypedArray a = context.obtainStyledAttributes(attrs, FragmentTag.Fragment); 3645 if (fname == null) { 3646 fname = a.getString(FragmentTag.Fragment_name); 3647 } 3648 int id = a.getResourceId(FragmentTag.Fragment_id, View.NO_ID); 3649 String tag = a.getString(FragmentTag.Fragment_tag); 3650 a.recycle(); 3651 3652 if (!Fragment.isSupportFragmentClass(mHost.getContext(), fname)) { 3653 // Invalid support lib fragment; let the device's framework handle it. 3654 // This will allow android.app.Fragments to do the right thing. 3655 return null; 3656 } 3657 3658 int containerId = parent != null ? parent.getId() : 0; 3659 if (containerId == View.NO_ID && id == View.NO_ID && tag == null) { 3660 throw new IllegalArgumentException(attrs.getPositionDescription() 3661 + ": Must specify unique android:id, android:tag, or have a parent with an id for " + fname); 3662 } 3663 3664 // If we restored from a previous state, we may already have 3665 // instantiated this fragment from the state and should use 3666 // that instance instead of making a new one. 3667 Fragment fragment = id != View.NO_ID ? findFragmentById(id) : null; 3668 if (fragment == null && tag != null) { 3669 fragment = findFragmentByTag(tag); 3670 } 3671 if (fragment == null && containerId != View.NO_ID) { 3672 fragment = findFragmentById(containerId); 3673 } 3674 3675 if (FragmentManagerImpl.DEBUG) Log.v(TAG, "onCreateView: id=0x" 3676 + Integer.toHexString(id) + " fname=" + fname 3677 + " existing=" + fragment); 3678 if (fragment == null) { 3679 fragment = mContainer.instantiate(context, fname, null); 3680 fragment.mFromLayout = true; 3681 fragment.mFragmentId = id != 0 ? id : containerId; 3682 fragment.mContainerId = containerId; 3683 fragment.mTag = tag; 3684 fragment.mInLayout = true; 3685 fragment.mFragmentManager = this; 3686 fragment.mHost = mHost; 3687 fragment.onInflate(mHost.getContext(), attrs, fragment.mSavedFragmentState); 3688 addFragment(fragment, true); 3689 3690 } else if (fragment.mInLayout) { 3691 // A fragment already exists and it is not one we restored from 3692 // previous state. 3693 throw new IllegalArgumentException(attrs.getPositionDescription() 3694 + ": Duplicate id 0x" + Integer.toHexString(id) 3695 + ", tag " + tag + ", or parent id 0x" + Integer.toHexString(containerId) 3696 + " with another fragment for " + fname); 3697 } else { 3698 // This fragment was retained from a previous instance; get it 3699 // going now. 3700 fragment.mInLayout = true; 3701 fragment.mHost = mHost; 3702 // If this fragment is newly instantiated (either right now, or 3703 // from last saved state), then give it the attributes to 3704 // initialize itself. 3705 if (!fragment.mRetaining) { 3706 fragment.onInflate(mHost.getContext(), attrs, fragment.mSavedFragmentState); 3707 } 3708 } 3709 3710 // If we haven't finished entering the CREATED state ourselves yet, 3711 // push the inflated child fragment along. This will ensureInflatedFragmentView 3712 // at the right phase of the lifecycle so that we will have mView populated 3713 // for compliant fragments below. 3714 if (mCurState < Fragment.CREATED && fragment.mFromLayout) { 3715 moveToState(fragment, Fragment.CREATED, 0, 0, false); 3716 } else { 3717 moveToState(fragment); 3718 } 3719 3720 if (fragment.mView == null) { 3721 throw new IllegalStateException("Fragment " + fname 3722 + " did not create a view."); 3723 } 3724 if (id != 0) { 3725 fragment.mView.setId(id); 3726 } 3727 if (fragment.mView.getTag() == null) { 3728 fragment.mView.setTag(tag); 3729 } 3730 return fragment.mView; 3731 } 3732 3733 @Override 3734 public View onCreateView(String name, Context context, AttributeSet attrs) { 3735 return onCreateView(null, name, context, attrs); 3736 } 3737 3738 LayoutInflater.Factory2 getLayoutInflaterFactory() { 3739 return this; 3740 } 3741 3742 static class FragmentTag { 3743 public static final int[] Fragment = { 3744 0x01010003, 0x010100d0, 0x010100d1 3745 }; 3746 public static final int Fragment_id = 1; 3747 public static final int Fragment_name = 0; 3748 public static final int Fragment_tag = 2; 3749 } 3750 3751 /** 3752 * An add or pop transaction to be scheduled for the UI thread. 3753 */ 3754 interface OpGenerator { 3755 /** 3756 * Generate transactions to add to {@code records} and whether or not the transaction is 3757 * an add or pop to {@code isRecordPop}. 3758 * 3759 * records and isRecordPop must be added equally so that each transaction in records 3760 * matches the boolean for whether or not it is a pop in isRecordPop. 3761 * 3762 * @param records A list to add transactions to. 3763 * @param isRecordPop A list to add whether or not the transactions added to records is 3764 * a pop transaction. 3765 * @return true if something was added or false otherwise. 3766 */ 3767 boolean generateOps(ArrayList<BackStackRecord> records, ArrayList<Boolean> isRecordPop); 3768 } 3769 3770 /** 3771 * A pop operation OpGenerator. This will be run on the UI thread and will generate the 3772 * transactions that will be popped if anything can be popped. 3773 */ 3774 private class PopBackStackState implements OpGenerator { 3775 final String mName; 3776 final int mId; 3777 final int mFlags; 3778 3779 PopBackStackState(String name, int id, int flags) { 3780 mName = name; 3781 mId = id; 3782 mFlags = flags; 3783 } 3784 3785 @Override 3786 public boolean generateOps(ArrayList<BackStackRecord> records, 3787 ArrayList<Boolean> isRecordPop) { 3788 if (mPrimaryNav != null // We have a primary nav fragment 3789 && mId < 0 // No valid id (since they're local) 3790 && mName == null) { // no name to pop to (since they're local) 3791 final FragmentManager childManager = mPrimaryNav.peekChildFragmentManager(); 3792 if (childManager != null && childManager.popBackStackImmediate()) { 3793 // We didn't add any operations for this FragmentManager even though 3794 // a child did do work. 3795 return false; 3796 } 3797 } 3798 return popBackStackState(records, isRecordPop, mName, mId, mFlags); 3799 } 3800 } 3801 3802 /** 3803 * A listener for a postponed transaction. This waits until 3804 * {@link Fragment#startPostponedEnterTransition()} is called or a transaction is started 3805 * that interacts with this one, based on interactions with the fragment container. 3806 */ 3807 static class StartEnterTransitionListener 3808 implements Fragment.OnStartEnterTransitionListener { 3809 private final boolean mIsBack; 3810 private final BackStackRecord mRecord; 3811 private int mNumPostponed; 3812 3813 StartEnterTransitionListener(BackStackRecord record, boolean isBack) { 3814 mIsBack = isBack; 3815 mRecord = record; 3816 } 3817 3818 /** 3819 * Called from {@link Fragment#startPostponedEnterTransition()}, this decreases the 3820 * number of Fragments that are postponed. This may cause the transaction to schedule 3821 * to finish running and run transitions and animations. 3822 */ 3823 @Override 3824 public void onStartEnterTransition() { 3825 mNumPostponed--; 3826 if (mNumPostponed != 0) { 3827 return; 3828 } 3829 mRecord.mManager.scheduleCommit(); 3830 } 3831 3832 /** 3833 * Called from {@link Fragment# 3834 * setOnStartEnterTransitionListener(Fragment.OnStartEnterTransitionListener)}, this 3835 * increases the number of fragments that are postponed as part of this transaction. 3836 */ 3837 @Override 3838 public void startListening() { 3839 mNumPostponed++; 3840 } 3841 3842 /** 3843 * @return true if there are no more postponed fragments as part of the transaction. 3844 */ 3845 public boolean isReady() { 3846 return mNumPostponed == 0; 3847 } 3848 3849 /** 3850 * Completes the transaction and start the animations and transitions. This may skip 3851 * the transitions if this is called before all fragments have called 3852 * {@link Fragment#startPostponedEnterTransition()}. 3853 */ 3854 public void completeTransaction() { 3855 final boolean canceled; 3856 canceled = mNumPostponed > 0; 3857 FragmentManagerImpl manager = mRecord.mManager; 3858 final int numAdded = manager.mAdded.size(); 3859 for (int i = 0; i < numAdded; i++) { 3860 final Fragment fragment = manager.mAdded.get(i); 3861 fragment.setOnStartEnterTransitionListener(null); 3862 if (canceled && fragment.isPostponed()) { 3863 fragment.startPostponedEnterTransition(); 3864 } 3865 } 3866 mRecord.mManager.completeExecute(mRecord, mIsBack, !canceled, true); 3867 } 3868 3869 /** 3870 * Cancels this transaction instead of completing it. That means that the state isn't 3871 * changed, so the pop results in no change to the state. 3872 */ 3873 public void cancelTransaction() { 3874 mRecord.mManager.completeExecute(mRecord, mIsBack, false, false); 3875 } 3876 } 3877 3878 /** 3879 * Contains either an animator or animation. One of these should be null. 3880 */ 3881 private static class AnimationOrAnimator { 3882 public final Animation animation; 3883 public final Animator animator; 3884 3885 private AnimationOrAnimator(Animation animation) { 3886 this.animation = animation; 3887 this.animator = null; 3888 if (animation == null) { 3889 throw new IllegalStateException("Animation cannot be null"); 3890 } 3891 } 3892 3893 private AnimationOrAnimator(Animator animator) { 3894 this.animation = null; 3895 this.animator = animator; 3896 if (animator == null) { 3897 throw new IllegalStateException("Animator cannot be null"); 3898 } 3899 } 3900 } 3901 3902 /** 3903 * Wrap an AnimationListener that can be null. This allows us to chain animation listeners. 3904 */ 3905 private static class AnimationListenerWrapper implements AnimationListener { 3906 private final AnimationListener mWrapped; 3907 3908 private AnimationListenerWrapper(AnimationListener wrapped) { 3909 mWrapped = wrapped; 3910 } 3911 3912 @CallSuper 3913 @Override 3914 public void onAnimationStart(Animation animation) { 3915 if (mWrapped != null) { 3916 mWrapped.onAnimationStart(animation); 3917 } 3918 } 3919 3920 @CallSuper 3921 @Override 3922 public void onAnimationEnd(Animation animation) { 3923 if (mWrapped != null) { 3924 mWrapped.onAnimationEnd(animation); 3925 } 3926 } 3927 3928 @CallSuper 3929 @Override 3930 public void onAnimationRepeat(Animation animation) { 3931 if (mWrapped != null) { 3932 mWrapped.onAnimationRepeat(animation); 3933 } 3934 } 3935 } 3936 3937 /** 3938 * Reset the layer type to LAYER_TYPE_NONE at the end of an animation. 3939 */ 3940 private static class AnimateOnHWLayerIfNeededListener extends AnimationListenerWrapper { 3941 View mView; 3942 3943 AnimateOnHWLayerIfNeededListener(final View v, AnimationListener listener) { 3944 super(listener); 3945 mView = v; 3946 } 3947 3948 @Override 3949 @CallSuper 3950 public void onAnimationEnd(Animation animation) { 3951 // If we're attached to a window, assume we're in the normal performTraversals 3952 // drawing path for Animations running. It's not safe to change the layer type 3953 // during drawing, so post it to the View to run later. If we're not attached 3954 // or we're running on N and above, post it to the view. If we're not on N and 3955 // not attached, do it right now since existing platform versions don't run the 3956 // hwui renderer for detached views off the UI thread making changing layer type 3957 // safe, but posting may not be. 3958 // Prior to N posting to a detached view from a non-Looper thread could cause 3959 // leaks, since the thread-local run queue on a non-Looper thread would never 3960 // be flushed. 3961 if (ViewCompat.isAttachedToWindow(mView) || Build.VERSION.SDK_INT >= 24) { 3962 mView.post(new Runnable() { 3963 @Override 3964 public void run() { 3965 mView.setLayerType(View.LAYER_TYPE_NONE, null); 3966 } 3967 }); 3968 } else { 3969 mView.setLayerType(View.LAYER_TYPE_NONE, null); 3970 } 3971 super.onAnimationEnd(animation); 3972 } 3973 } 3974 3975 /** 3976 * Set the layer type to LAYER_TYPE_HARDWARE while an animator is running. 3977 */ 3978 private static class AnimatorOnHWLayerIfNeededListener extends AnimatorListenerAdapter { 3979 View mView; 3980 3981 AnimatorOnHWLayerIfNeededListener(final View v) { 3982 mView = v; 3983 } 3984 3985 @Override 3986 public void onAnimationStart(Animator animation) { 3987 mView.setLayerType(View.LAYER_TYPE_HARDWARE, null); 3988 } 3989 3990 @Override 3991 public void onAnimationEnd(Animator animation) { 3992 mView.setLayerType(View.LAYER_TYPE_NONE, null); 3993 animation.removeListener(this); 3994 } 3995 } 3996} 3997