FragmentManager.java revision 267b02ebf455fa4d7de59150548676e406b2dd2b
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 android.content.Context; 20import android.content.res.Configuration; 21import android.content.res.Resources.NotFoundException; 22import android.content.res.TypedArray; 23import android.os.Build; 24import android.os.Bundle; 25import android.os.Looper; 26import android.os.Parcel; 27import android.os.Parcelable; 28import android.support.annotation.CallSuper; 29import android.support.annotation.IdRes; 30import android.support.annotation.RestrictTo; 31import android.support.annotation.StringRes; 32import android.support.v4.os.BuildCompat; 33import android.support.v4.util.DebugUtils; 34import android.support.v4.util.LogWriter; 35import android.support.v4.util.Pair; 36import android.support.v4.view.LayoutInflaterFactory; 37import android.support.v4.view.ViewCompat; 38import android.util.AttributeSet; 39import android.util.Log; 40import android.util.SparseArray; 41import android.view.LayoutInflater; 42import android.view.Menu; 43import android.view.MenuInflater; 44import android.view.MenuItem; 45import android.view.View; 46import android.view.ViewGroup; 47import android.view.animation.AccelerateInterpolator; 48import android.view.animation.AlphaAnimation; 49import android.view.animation.Animation; 50import android.view.animation.Animation.AnimationListener; 51import android.view.animation.AnimationSet; 52import android.view.animation.AnimationUtils; 53import android.view.animation.DecelerateInterpolator; 54import android.view.animation.Interpolator; 55import android.view.animation.ScaleAnimation; 56 57import java.io.FileDescriptor; 58import java.io.PrintWriter; 59import java.lang.reflect.Field; 60import java.util.ArrayList; 61import java.util.Arrays; 62import java.util.List; 63import java.util.concurrent.CopyOnWriteArrayList; 64 65import static android.support.annotation.RestrictTo.Scope.GROUP_ID; 66 67/** 68 * Static library support version of the framework's {@link android.app.FragmentManager}. 69 * Used to write apps that run on platforms prior to Android 3.0. When running 70 * on Android 3.0 or above, this implementation is still used; it does not try 71 * to switch to the framework's implementation. See the framework {@link FragmentManager} 72 * documentation for a class overview. 73 * 74 * <p>Your activity must derive from {@link FragmentActivity} to use this. From such an activity, 75 * you can acquire the {@link FragmentManager} by calling 76 * {@link FragmentActivity#getSupportFragmentManager}. 77 */ 78public abstract class FragmentManager { 79 /** 80 * Representation of an entry on the fragment back stack, as created 81 * with {@link FragmentTransaction#addToBackStack(String) 82 * FragmentTransaction.addToBackStack()}. Entries can later be 83 * retrieved with {@link FragmentManager#getBackStackEntryAt(int) 84 * FragmentManager.getBackStackEntryAt()}. 85 * 86 * <p>Note that you should never hold on to a BackStackEntry object; 87 * the identifier as returned by {@link #getId} is the only thing that 88 * will be persisted across activity instances. 89 */ 90 public interface BackStackEntry { 91 /** 92 * Return the unique identifier for the entry. This is the only 93 * representation of the entry that will persist across activity 94 * instances. 95 */ 96 public int getId(); 97 98 /** 99 * Get the name that was supplied to 100 * {@link FragmentTransaction#addToBackStack(String) 101 * FragmentTransaction.addToBackStack(String)} when creating this entry. 102 */ 103 public String getName(); 104 105 /** 106 * Return the full bread crumb title resource identifier for the entry, 107 * or 0 if it does not have one. 108 */ 109 @StringRes 110 public int getBreadCrumbTitleRes(); 111 112 /** 113 * Return the short bread crumb title resource identifier for the entry, 114 * or 0 if it does not have one. 115 */ 116 @StringRes 117 public int getBreadCrumbShortTitleRes(); 118 119 /** 120 * Return the full bread crumb title for the entry, or null if it 121 * does not have one. 122 */ 123 public CharSequence getBreadCrumbTitle(); 124 125 /** 126 * Return the short bread crumb title for the entry, or null if it 127 * does not have one. 128 */ 129 public CharSequence getBreadCrumbShortTitle(); 130 } 131 132 /** 133 * Interface to watch for changes to the back stack. 134 */ 135 public interface OnBackStackChangedListener { 136 /** 137 * Called whenever the contents of the back stack change. 138 */ 139 public void onBackStackChanged(); 140 } 141 142 /** 143 * Start a series of edit operations on the Fragments associated with 144 * this FragmentManager. 145 * 146 * <p>Note: A fragment transaction can only be created/committed prior 147 * to an activity saving its state. If you try to commit a transaction 148 * after {@link FragmentActivity#onSaveInstanceState FragmentActivity.onSaveInstanceState()} 149 * (and prior to a following {@link FragmentActivity#onStart FragmentActivity.onStart} 150 * or {@link FragmentActivity#onResume FragmentActivity.onResume()}, you will get an error. 151 * This is because the framework takes care of saving your current fragments 152 * in the state, and if changes are made after the state is saved then they 153 * will be lost.</p> 154 */ 155 public abstract FragmentTransaction beginTransaction(); 156 157 /** 158 * @hide -- remove once prebuilts are in. 159 * @deprecated 160 */ 161 @RestrictTo(GROUP_ID) 162 @Deprecated 163 public FragmentTransaction openTransaction() { 164 return beginTransaction(); 165 } 166 167 /** 168 * After a {@link FragmentTransaction} is committed with 169 * {@link FragmentTransaction#commit FragmentTransaction.commit()}, it 170 * is scheduled to be executed asynchronously on the process's main thread. 171 * If you want to immediately executing any such pending operations, you 172 * can call this function (only from the main thread) to do so. Note that 173 * all callbacks and other related behavior will be done from within this 174 * call, so be careful about where this is called from. 175 * 176 * <p>If you are committing a single transaction that does not modify the 177 * fragment back stack, strongly consider using 178 * {@link FragmentTransaction#commitNow()} instead. This can help avoid 179 * unwanted side effects when other code in your app has pending committed 180 * transactions that expect different timing.</p> 181 * <p> 182 * This also forces the start of any postponed Transactions where 183 * {@link Fragment#postponeEnterTransition()} has been called. 184 * 185 * @return Returns true if there were any pending transactions to be 186 * executed. 187 */ 188 public abstract boolean executePendingTransactions(); 189 190 /** 191 * Finds a fragment that was identified by the given id either when inflated 192 * from XML or as the container ID when added in a transaction. This first 193 * searches through fragments that are currently added to the manager's 194 * activity; if no such fragment is found, then all fragments currently 195 * on the back stack associated with this ID are searched. 196 * @return The fragment if found or null otherwise. 197 */ 198 public abstract Fragment findFragmentById(@IdRes int id); 199 200 /** 201 * Finds a fragment that was identified by the given tag either when inflated 202 * from XML or as supplied when added in a transaction. This first 203 * searches through fragments that are currently added to the manager's 204 * activity; if no such fragment is found, then all fragments currently 205 * on the back stack are searched. 206 * @return The fragment if found or null otherwise. 207 */ 208 public abstract Fragment findFragmentByTag(String tag); 209 210 /** 211 * Flag for {@link #popBackStack(String, int)} 212 * and {@link #popBackStack(int, int)}: If set, and the name or ID of 213 * a back stack entry has been supplied, then all matching entries will 214 * be consumed until one that doesn't match is found or the bottom of 215 * the stack is reached. Otherwise, all entries up to but not including that entry 216 * will be removed. 217 */ 218 public static final int POP_BACK_STACK_INCLUSIVE = 1<<0; 219 220 /** 221 * Pop the top state off the back stack. Returns true if there was one 222 * to pop, else false. This function is asynchronous -- it enqueues the 223 * request to pop, but the action will not be performed until the application 224 * returns to its event loop. 225 */ 226 public abstract void popBackStack(); 227 228 /** 229 * Like {@link #popBackStack()}, but performs the operation immediately 230 * inside of the call. This is like calling {@link #executePendingTransactions()} 231 * afterwards without forcing the start of postponed Transactions. 232 * @return Returns true if there was something popped, else false. 233 */ 234 public abstract boolean popBackStackImmediate(); 235 236 /** 237 * Pop the last fragment transition from the manager's fragment 238 * back stack. If there is nothing to pop, false is returned. 239 * This function is asynchronous -- it enqueues the 240 * request to pop, but the action will not be performed until the application 241 * returns to its event loop. 242 * 243 * @param name If non-null, this is the name of a previous back state 244 * to look for; if found, all states up to that state will be popped. The 245 * {@link #POP_BACK_STACK_INCLUSIVE} flag can be used to control whether 246 * the named state itself is popped. If null, only the top state is popped. 247 * @param flags Either 0 or {@link #POP_BACK_STACK_INCLUSIVE}. 248 */ 249 public abstract void popBackStack(String name, int flags); 250 251 /** 252 * Like {@link #popBackStack(String, int)}, but performs the operation immediately 253 * inside of the call. This is like calling {@link #executePendingTransactions()} 254 * afterwards without forcing the start of postponed Transactions. 255 * @return Returns true if there was something popped, else false. 256 */ 257 public abstract boolean popBackStackImmediate(String name, int flags); 258 259 /** 260 * Pop all back stack states up to the one with the given identifier. 261 * This function is asynchronous -- it enqueues the 262 * request to pop, but the action will not be performed until the application 263 * returns to its event loop. 264 * 265 * @param id Identifier of the stated to be popped. If no identifier exists, 266 * false is returned. 267 * The identifier is the number returned by 268 * {@link FragmentTransaction#commit() FragmentTransaction.commit()}. The 269 * {@link #POP_BACK_STACK_INCLUSIVE} flag can be used to control whether 270 * the named state itself is popped. 271 * @param flags Either 0 or {@link #POP_BACK_STACK_INCLUSIVE}. 272 */ 273 public abstract void popBackStack(int id, int flags); 274 275 /** 276 * Like {@link #popBackStack(int, int)}, but performs the operation immediately 277 * inside of the call. This is like calling {@link #executePendingTransactions()} 278 * afterwards without forcing the start of postponed Transactions. 279 * @return Returns true if there was something popped, else false. 280 */ 281 public abstract boolean popBackStackImmediate(int id, int flags); 282 283 /** 284 * Return the number of entries currently in the back stack. 285 */ 286 public abstract int getBackStackEntryCount(); 287 288 /** 289 * Return the BackStackEntry at index <var>index</var> in the back stack; 290 * entries start index 0 being the bottom of the stack. 291 */ 292 public abstract BackStackEntry getBackStackEntryAt(int index); 293 294 /** 295 * Add a new listener for changes to the fragment back stack. 296 */ 297 public abstract void addOnBackStackChangedListener(OnBackStackChangedListener listener); 298 299 /** 300 * Remove a listener that was previously added with 301 * {@link #addOnBackStackChangedListener(OnBackStackChangedListener)}. 302 */ 303 public abstract void removeOnBackStackChangedListener(OnBackStackChangedListener listener); 304 305 /** 306 * Put a reference to a fragment in a Bundle. This Bundle can be 307 * persisted as saved state, and when later restoring 308 * {@link #getFragment(Bundle, String)} will return the current 309 * instance of the same fragment. 310 * 311 * @param bundle The bundle in which to put the fragment reference. 312 * @param key The name of the entry in the bundle. 313 * @param fragment The Fragment whose reference is to be stored. 314 */ 315 public abstract void putFragment(Bundle bundle, String key, Fragment fragment); 316 317 /** 318 * Retrieve the current Fragment instance for a reference previously 319 * placed with {@link #putFragment(Bundle, String, Fragment)}. 320 * 321 * @param bundle The bundle from which to retrieve the fragment reference. 322 * @param key The name of the entry in the bundle. 323 * @return Returns the current Fragment instance that is associated with 324 * the given reference. 325 */ 326 public abstract Fragment getFragment(Bundle bundle, String key); 327 328 /** 329 * Get a list of all fragments that have been added to the fragment manager. 330 * 331 * @return The list of all fragments or null if none. 332 * @hide 333 */ 334 @RestrictTo(GROUP_ID) 335 public abstract List<Fragment> getFragments(); 336 337 /** 338 * Save the current instance state of the given Fragment. This can be 339 * used later when creating a new instance of the Fragment and adding 340 * it to the fragment manager, to have it create itself to match the 341 * current state returned here. Note that there are limits on how 342 * this can be used: 343 * 344 * <ul> 345 * <li>The Fragment must currently be attached to the FragmentManager. 346 * <li>A new Fragment created using this saved state must be the same class 347 * type as the Fragment it was created from. 348 * <li>The saved state can not contain dependencies on other fragments -- 349 * that is it can't use {@link #putFragment(Bundle, String, Fragment)} to 350 * store a fragment reference because that reference may not be valid when 351 * this saved state is later used. Likewise the Fragment's target and 352 * result code are not included in this state. 353 * </ul> 354 * 355 * @param f The Fragment whose state is to be saved. 356 * @return The generated state. This will be null if there was no 357 * interesting state created by the fragment. 358 */ 359 public abstract Fragment.SavedState saveFragmentInstanceState(Fragment f); 360 361 /** 362 * Returns true if the final {@link android.app.Activity#onDestroy() Activity.onDestroy()} 363 * call has been made on the FragmentManager's Activity, so this instance is now dead. 364 */ 365 public abstract boolean isDestroyed(); 366 367 /** 368 * Registers a {@link FragmentLifecycleCallbacks} to listen to fragment lifecycle events 369 * happening in this FragmentManager. All registered callbacks will be automatically 370 * unregistered when this FragmentManager is destroyed. 371 * 372 * @param cb Callbacks to register 373 * @param recursive true to automatically register this callback for all child FragmentManagers 374 */ 375 public abstract void registerFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb, 376 boolean recursive); 377 378 /** 379 * Unregisters a previously registered {@link FragmentLifecycleCallbacks}. If the callback 380 * was not previously registered this call has no effect. All registered callbacks will be 381 * automatically unregistered when this FragmentManager is destroyed. 382 * 383 * @param cb Callbacks to unregister 384 */ 385 public abstract void unregisterFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb); 386 387 /** 388 * Print the FragmentManager's state into the given stream. 389 * 390 * @param prefix Text to print at the front of each line. 391 * @param fd The raw file descriptor that the dump is being sent to. 392 * @param writer A PrintWriter to which the dump is to be set. 393 * @param args Additional arguments to the dump request. 394 */ 395 public abstract void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args); 396 397 /** 398 * Control whether the framework's internal fragment manager debugging 399 * logs are turned on. If enabled, you will see output in logcat as 400 * the framework performs fragment operations. 401 */ 402 public static void enableDebugLogging(boolean enabled) { 403 FragmentManagerImpl.DEBUG = enabled; 404 } 405 406 /** 407 * Callback interface for listening to fragment state changes that happen 408 * within a given FragmentManager. 409 */ 410 public abstract class FragmentLifecycleCallbacks { 411 /** 412 * Called right before the fragment's {@link Fragment#onAttach(Context)} method is called. 413 * This is a good time to inject any required dependencies for the fragment before any of 414 * the fragment's lifecycle methods are invoked. 415 * 416 * @param fm Host FragmentManager 417 * @param f Fragment changing state 418 * @param context Context that the Fragment is being attached to 419 */ 420 public void onFragmentPreAttached(FragmentManager fm, Fragment f, Context context) {} 421 422 /** 423 * Called after the fragment has been attached to its host. Its host will have had 424 * <code>onAttachFragment</code> called before this call happens. 425 * 426 * @param fm Host FragmentManager 427 * @param f Fragment changing state 428 * @param context Context that the Fragment was attached to 429 */ 430 public void onFragmentAttached(FragmentManager fm, Fragment f, Context context) {} 431 432 /** 433 * Called after the fragment has returned from the FragmentManager's call to 434 * {@link Fragment#onCreate(Bundle)}. This will only happen once for any given 435 * fragment instance, though the fragment may be attached and detached multiple times. 436 * 437 * @param fm Host FragmentManager 438 * @param f Fragment changing state 439 * @param savedInstanceState Saved instance bundle from a previous instance 440 */ 441 public void onFragmentCreated(FragmentManager fm, Fragment f, Bundle savedInstanceState) {} 442 443 /** 444 * Called after the fragment has returned from the FragmentManager's call to 445 * {@link Fragment#onActivityCreated(Bundle)}. This will only happen once for any given 446 * fragment instance, though the fragment may be attached and detached multiple times. 447 * 448 * @param fm Host FragmentManager 449 * @param f Fragment changing state 450 * @param savedInstanceState Saved instance bundle from a previous instance 451 */ 452 public void onFragmentActivityCreated(FragmentManager fm, Fragment f, 453 Bundle savedInstanceState) {} 454 455 /** 456 * Called after the fragment has returned a non-null view from the FragmentManager's 457 * request to {@link Fragment#onCreateView(LayoutInflater, ViewGroup, Bundle)}. 458 * 459 * @param fm Host FragmentManager 460 * @param f Fragment that created and owns the view 461 * @param v View returned by the fragment 462 * @param savedInstanceState Saved instance bundle from a previous instance 463 */ 464 public void onFragmentViewCreated(FragmentManager fm, Fragment f, View v, 465 Bundle savedInstanceState) {} 466 467 /** 468 * Called after the fragment has returned from the FragmentManager's call to 469 * {@link Fragment#onStart()}. 470 * 471 * @param fm Host FragmentManager 472 * @param f Fragment changing state 473 */ 474 public void onFragmentStarted(FragmentManager fm, Fragment f) {} 475 476 /** 477 * Called after the fragment has returned from the FragmentManager's call to 478 * {@link Fragment#onResume()}. 479 * 480 * @param fm Host FragmentManager 481 * @param f Fragment changing state 482 */ 483 public void onFragmentResumed(FragmentManager fm, Fragment f) {} 484 485 /** 486 * Called after the fragment has returned from the FragmentManager's call to 487 * {@link Fragment#onPause()}. 488 * 489 * @param fm Host FragmentManager 490 * @param f Fragment changing state 491 */ 492 public void onFragmentPaused(FragmentManager fm, Fragment f) {} 493 494 /** 495 * Called after the fragment has returned from the FragmentManager's call to 496 * {@link Fragment#onStop()}. 497 * 498 * @param fm Host FragmentManager 499 * @param f Fragment changing state 500 */ 501 public void onFragmentStopped(FragmentManager fm, Fragment f) {} 502 503 /** 504 * Called after the fragment has returned from the FragmentManager's call to 505 * {@link Fragment#onSaveInstanceState(Bundle)}. 506 * 507 * @param fm Host FragmentManager 508 * @param f Fragment changing state 509 * @param outState Saved state bundle for the fragment 510 */ 511 public void onFragmentSaveInstanceState(FragmentManager fm, Fragment f, Bundle outState) {} 512 513 /** 514 * Called after the fragment has returned from the FragmentManager's call to 515 * {@link Fragment#onDestroyView()}. 516 * 517 * @param fm Host FragmentManager 518 * @param f Fragment changing state 519 */ 520 public void onFragmentViewDestroyed(FragmentManager fm, Fragment f) {} 521 522 /** 523 * Called after the fragment has returned from the FragmentManager's call to 524 * {@link Fragment#onDestroy()}. 525 * 526 * @param fm Host FragmentManager 527 * @param f Fragment changing state 528 */ 529 public void onFragmentDestroyed(FragmentManager fm, Fragment f) {} 530 531 /** 532 * Called after the fragment has returned from the FragmentManager's call to 533 * {@link Fragment#onDetach()}. 534 * 535 * @param fm Host FragmentManager 536 * @param f Fragment changing state 537 */ 538 public void onFragmentDetached(FragmentManager fm, Fragment f) {} 539 } 540} 541 542final class FragmentManagerState implements Parcelable { 543 FragmentState[] mActive; 544 int[] mAdded; 545 BackStackState[] mBackStack; 546 547 public FragmentManagerState() { 548 } 549 550 public FragmentManagerState(Parcel in) { 551 mActive = in.createTypedArray(FragmentState.CREATOR); 552 mAdded = in.createIntArray(); 553 mBackStack = in.createTypedArray(BackStackState.CREATOR); 554 } 555 556 @Override 557 public int describeContents() { 558 return 0; 559 } 560 561 @Override 562 public void writeToParcel(Parcel dest, int flags) { 563 dest.writeTypedArray(mActive, flags); 564 dest.writeIntArray(mAdded); 565 dest.writeTypedArray(mBackStack, flags); 566 } 567 568 public static final Parcelable.Creator<FragmentManagerState> CREATOR 569 = new Parcelable.Creator<FragmentManagerState>() { 570 @Override 571 public FragmentManagerState createFromParcel(Parcel in) { 572 return new FragmentManagerState(in); 573 } 574 575 @Override 576 public FragmentManagerState[] newArray(int size) { 577 return new FragmentManagerState[size]; 578 } 579 }; 580} 581 582/** 583 * Container for fragments associated with an activity. 584 */ 585final class FragmentManagerImpl extends FragmentManager implements LayoutInflaterFactory { 586 static boolean DEBUG = false; 587 static final String TAG = "FragmentManager"; 588 589 static final boolean HONEYCOMB = android.os.Build.VERSION.SDK_INT >= 11; 590 591 static final String TARGET_REQUEST_CODE_STATE_TAG = "android:target_req_state"; 592 static final String TARGET_STATE_TAG = "android:target_state"; 593 static final String VIEW_STATE_TAG = "android:view_state"; 594 static final String USER_VISIBLE_HINT_TAG = "android:user_visible_hint"; 595 596 static class AnimateOnHWLayerIfNeededListener implements AnimationListener { 597 private AnimationListener mOriginalListener; 598 private boolean mShouldRunOnHWLayer; 599 View mView; 600 601 public AnimateOnHWLayerIfNeededListener(final View v, Animation anim) { 602 if (v == null || anim == null) { 603 return; 604 } 605 mView = v; 606 } 607 608 public AnimateOnHWLayerIfNeededListener(final View v, Animation anim, 609 AnimationListener listener) { 610 if (v == null || anim == null) { 611 return; 612 } 613 mOriginalListener = listener; 614 mView = v; 615 mShouldRunOnHWLayer = true; 616 } 617 618 @Override 619 @CallSuper 620 public void onAnimationStart(Animation animation) { 621 if (mOriginalListener != null) { 622 mOriginalListener.onAnimationStart(animation); 623 } 624 } 625 626 @Override 627 @CallSuper 628 public void onAnimationEnd(Animation animation) { 629 if (mView != null && mShouldRunOnHWLayer) { 630 // If we're attached to a window, assume we're in the normal performTraversals 631 // drawing path for Animations running. It's not safe to change the layer type 632 // during drawing, so post it to the View to run later. If we're not attached 633 // or we're running on N and above, post it to the view. If we're not on N and 634 // not attached, do it right now since existing platform versions don't run the 635 // hwui renderer for detached views off the UI thread making changing layer type 636 // safe, but posting may not be. 637 // Prior to N posting to a detached view from a non-Looper thread could cause 638 // leaks, since the thread-local run queue on a non-Looper thread would never 639 // be flushed. 640 if (ViewCompat.isAttachedToWindow(mView) || BuildCompat.isAtLeastN()) { 641 mView.post(new Runnable() { 642 @Override 643 public void run() { 644 ViewCompat.setLayerType(mView, ViewCompat.LAYER_TYPE_NONE, null); 645 } 646 }); 647 } else { 648 ViewCompat.setLayerType(mView, ViewCompat.LAYER_TYPE_NONE, null); 649 } 650 } 651 if (mOriginalListener != null) { 652 mOriginalListener.onAnimationEnd(animation); 653 } 654 } 655 656 @Override 657 public void onAnimationRepeat(Animation animation) { 658 if (mOriginalListener != null) { 659 mOriginalListener.onAnimationRepeat(animation); 660 } 661 } 662 } 663 664 ArrayList<OpGenerator> mPendingActions; 665 Runnable[] mTmpActions; 666 boolean mExecutingActions; 667 668 ArrayList<Fragment> mActive; 669 ArrayList<Fragment> mAdded; 670 ArrayList<Integer> mAvailIndices; 671 ArrayList<BackStackRecord> mBackStack; 672 ArrayList<Fragment> mCreatedMenus; 673 674 // Must be accessed while locked. 675 ArrayList<BackStackRecord> mBackStackIndices; 676 ArrayList<Integer> mAvailBackStackIndices; 677 678 ArrayList<OnBackStackChangedListener> mBackStackChangeListeners; 679 private CopyOnWriteArrayList<Pair<FragmentLifecycleCallbacks, Boolean>> mLifecycleCallbacks; 680 681 int mCurState = Fragment.INITIALIZING; 682 FragmentHostCallback mHost; 683 FragmentContainer mContainer; 684 Fragment mParent; 685 686 static Field sAnimationListenerField = null; 687 688 boolean mNeedMenuInvalidate; 689 boolean mStateSaved; 690 boolean mDestroyed; 691 String mNoTransactionsBecause; 692 boolean mHavePendingDeferredStart; 693 694 // Temporary vars for optimizing execution of BackStackRecords: 695 ArrayList<BackStackRecord> mTmpRecords; 696 ArrayList<Boolean> mTmpIsPop; 697 ArrayList<Fragment> mTmpAddedFragments; 698 699 // Temporary vars for state save and restore. 700 Bundle mStateBundle = null; 701 SparseArray<Parcelable> mStateArray = null; 702 703 // Postponed transactions. 704 ArrayList<StartEnterTransitionListener> mPostponedTransactions; 705 706 Runnable mExecCommit = new Runnable() { 707 @Override 708 public void run() { 709 execPendingActions(); 710 } 711 }; 712 713 static boolean modifiesAlpha(Animation anim) { 714 if (anim instanceof AlphaAnimation) { 715 return true; 716 } else if (anim instanceof AnimationSet) { 717 List<Animation> anims = ((AnimationSet) anim).getAnimations(); 718 for (int i = 0; i < anims.size(); i++) { 719 if (anims.get(i) instanceof AlphaAnimation) { 720 return true; 721 } 722 } 723 } 724 return false; 725 } 726 727 static boolean shouldRunOnHWLayer(View v, Animation anim) { 728 return Build.VERSION.SDK_INT >= 19 729 && ViewCompat.getLayerType(v) == ViewCompat.LAYER_TYPE_NONE 730 && ViewCompat.hasOverlappingRendering(v) 731 && modifiesAlpha(anim); 732 } 733 734 private void throwException(RuntimeException ex) { 735 Log.e(TAG, ex.getMessage()); 736 Log.e(TAG, "Activity state:"); 737 LogWriter logw = new LogWriter(TAG); 738 PrintWriter pw = new PrintWriter(logw); 739 if (mHost != null) { 740 try { 741 mHost.onDump(" ", null, pw, new String[] { }); 742 } catch (Exception e) { 743 Log.e(TAG, "Failed dumping state", e); 744 } 745 } else { 746 try { 747 dump(" ", null, pw, new String[] { }); 748 } catch (Exception e) { 749 Log.e(TAG, "Failed dumping state", e); 750 } 751 } 752 throw ex; 753 } 754 755 @Override 756 public FragmentTransaction beginTransaction() { 757 return new BackStackRecord(this); 758 } 759 760 @Override 761 public boolean executePendingTransactions() { 762 boolean updates = execPendingActions(); 763 forcePostponedTransactions(); 764 return updates; 765 } 766 767 @Override 768 public void popBackStack() { 769 enqueueAction(new PopBackStackState(null, -1, 0), false); 770 } 771 772 @Override 773 public boolean popBackStackImmediate() { 774 checkStateLoss(); 775 return popBackStackImmediate(null, -1, 0); 776 } 777 778 @Override 779 public void popBackStack(final String name, final int flags) { 780 enqueueAction(new PopBackStackState(name, -1, flags), false); 781 } 782 783 @Override 784 public boolean popBackStackImmediate(String name, int flags) { 785 checkStateLoss(); 786 return popBackStackImmediate(name, -1, flags); 787 } 788 789 @Override 790 public void popBackStack(final int id, final int flags) { 791 if (id < 0) { 792 throw new IllegalArgumentException("Bad id: " + id); 793 } 794 enqueueAction(new PopBackStackState(null, id, flags), false); 795 } 796 797 @Override 798 public boolean popBackStackImmediate(int id, int flags) { 799 checkStateLoss(); 800 execPendingActions(); 801 if (id < 0) { 802 throw new IllegalArgumentException("Bad id: " + id); 803 } 804 return popBackStackImmediate(null, id, flags); 805 } 806 807 /** 808 * Used by all public popBackStackImmediate methods, this executes pending transactions and 809 * returns true if the pop action did anything, regardless of what other pending 810 * transactions did. 811 * 812 * @return true if the pop operation did anything or false otherwise. 813 */ 814 private boolean popBackStackImmediate(String name, int id, int flags) { 815 execPendingActions(); 816 ensureExecReady(true); 817 818 boolean executePop = popBackStackState(mTmpRecords, mTmpIsPop, name, id, flags); 819 if (executePop) { 820 mExecutingActions = true; 821 try { 822 optimizeAndExecuteOps(mTmpRecords, mTmpIsPop); 823 } finally { 824 cleanupExec(); 825 } 826 } 827 828 doPendingDeferredStart(); 829 return executePop; 830 } 831 832 @Override 833 public int getBackStackEntryCount() { 834 return mBackStack != null ? mBackStack.size() : 0; 835 } 836 837 @Override 838 public BackStackEntry getBackStackEntryAt(int index) { 839 return mBackStack.get(index); 840 } 841 842 @Override 843 public void addOnBackStackChangedListener(OnBackStackChangedListener listener) { 844 if (mBackStackChangeListeners == null) { 845 mBackStackChangeListeners = new ArrayList<OnBackStackChangedListener>(); 846 } 847 mBackStackChangeListeners.add(listener); 848 } 849 850 @Override 851 public void removeOnBackStackChangedListener(OnBackStackChangedListener listener) { 852 if (mBackStackChangeListeners != null) { 853 mBackStackChangeListeners.remove(listener); 854 } 855 } 856 857 @Override 858 public void putFragment(Bundle bundle, String key, Fragment fragment) { 859 if (fragment.mIndex < 0) { 860 throwException(new IllegalStateException("Fragment " + fragment 861 + " is not currently in the FragmentManager")); 862 } 863 bundle.putInt(key, fragment.mIndex); 864 } 865 866 @Override 867 public Fragment getFragment(Bundle bundle, String key) { 868 int index = bundle.getInt(key, -1); 869 if (index == -1) { 870 return null; 871 } 872 if (index >= mActive.size()) { 873 throwException(new IllegalStateException("Fragment no longer exists for key " 874 + key + ": index " + index)); 875 } 876 Fragment f = mActive.get(index); 877 if (f == null) { 878 throwException(new IllegalStateException("Fragment no longer exists for key " 879 + key + ": index " + index)); 880 } 881 return f; 882 } 883 884 @Override 885 public List<Fragment> getFragments() { 886 return mActive; 887 } 888 889 @Override 890 public Fragment.SavedState saveFragmentInstanceState(Fragment fragment) { 891 if (fragment.mIndex < 0) { 892 throwException( new IllegalStateException("Fragment " + fragment 893 + " is not currently in the FragmentManager")); 894 } 895 if (fragment.mState > Fragment.INITIALIZING) { 896 Bundle result = saveFragmentBasicState(fragment); 897 return result != null ? new Fragment.SavedState(result) : null; 898 } 899 return null; 900 } 901 902 @Override 903 public boolean isDestroyed() { 904 return mDestroyed; 905 } 906 907 @Override 908 public String toString() { 909 StringBuilder sb = new StringBuilder(128); 910 sb.append("FragmentManager{"); 911 sb.append(Integer.toHexString(System.identityHashCode(this))); 912 sb.append(" in "); 913 if (mParent != null) { 914 DebugUtils.buildShortClassTag(mParent, sb); 915 } else { 916 DebugUtils.buildShortClassTag(mHost, sb); 917 } 918 sb.append("}}"); 919 return sb.toString(); 920 } 921 922 @Override 923 public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) { 924 String innerPrefix = prefix + " "; 925 926 int N; 927 if (mActive != null) { 928 N = mActive.size(); 929 if (N > 0) { 930 writer.print(prefix); writer.print("Active Fragments in "); 931 writer.print(Integer.toHexString(System.identityHashCode(this))); 932 writer.println(":"); 933 for (int i=0; i<N; i++) { 934 Fragment f = mActive.get(i); 935 writer.print(prefix); writer.print(" #"); writer.print(i); 936 writer.print(": "); writer.println(f); 937 if (f != null) { 938 f.dump(innerPrefix, fd, writer, args); 939 } 940 } 941 } 942 } 943 944 if (mAdded != null) { 945 N = mAdded.size(); 946 if (N > 0) { 947 writer.print(prefix); writer.println("Added Fragments:"); 948 for (int i=0; i<N; i++) { 949 Fragment f = mAdded.get(i); 950 writer.print(prefix); writer.print(" #"); writer.print(i); 951 writer.print(": "); writer.println(f.toString()); 952 } 953 } 954 } 955 956 if (mCreatedMenus != null) { 957 N = mCreatedMenus.size(); 958 if (N > 0) { 959 writer.print(prefix); writer.println("Fragments Created Menus:"); 960 for (int i=0; i<N; i++) { 961 Fragment f = mCreatedMenus.get(i); 962 writer.print(prefix); writer.print(" #"); writer.print(i); 963 writer.print(": "); writer.println(f.toString()); 964 } 965 } 966 } 967 968 if (mBackStack != null) { 969 N = mBackStack.size(); 970 if (N > 0) { 971 writer.print(prefix); writer.println("Back Stack:"); 972 for (int i=0; i<N; i++) { 973 BackStackRecord bs = mBackStack.get(i); 974 writer.print(prefix); writer.print(" #"); writer.print(i); 975 writer.print(": "); writer.println(bs.toString()); 976 bs.dump(innerPrefix, fd, writer, args); 977 } 978 } 979 } 980 981 synchronized (this) { 982 if (mBackStackIndices != null) { 983 N = mBackStackIndices.size(); 984 if (N > 0) { 985 writer.print(prefix); writer.println("Back Stack Indices:"); 986 for (int i=0; i<N; i++) { 987 BackStackRecord bs = mBackStackIndices.get(i); 988 writer.print(prefix); writer.print(" #"); writer.print(i); 989 writer.print(": "); writer.println(bs); 990 } 991 } 992 } 993 994 if (mAvailBackStackIndices != null && mAvailBackStackIndices.size() > 0) { 995 writer.print(prefix); writer.print("mAvailBackStackIndices: "); 996 writer.println(Arrays.toString(mAvailBackStackIndices.toArray())); 997 } 998 } 999 1000 if (mPendingActions != null) { 1001 N = mPendingActions.size(); 1002 if (N > 0) { 1003 writer.print(prefix); writer.println("Pending Actions:"); 1004 for (int i=0; i<N; i++) { 1005 OpGenerator r = mPendingActions.get(i); 1006 writer.print(prefix); writer.print(" #"); writer.print(i); 1007 writer.print(": "); writer.println(r); 1008 } 1009 } 1010 } 1011 1012 writer.print(prefix); writer.println("FragmentManager misc state:"); 1013 writer.print(prefix); writer.print(" mHost="); writer.println(mHost); 1014 writer.print(prefix); writer.print(" mContainer="); writer.println(mContainer); 1015 if (mParent != null) { 1016 writer.print(prefix); writer.print(" mParent="); writer.println(mParent); 1017 } 1018 writer.print(prefix); writer.print(" mCurState="); writer.print(mCurState); 1019 writer.print(" mStateSaved="); writer.print(mStateSaved); 1020 writer.print(" mDestroyed="); writer.println(mDestroyed); 1021 if (mNeedMenuInvalidate) { 1022 writer.print(prefix); writer.print(" mNeedMenuInvalidate="); 1023 writer.println(mNeedMenuInvalidate); 1024 } 1025 if (mNoTransactionsBecause != null) { 1026 writer.print(prefix); writer.print(" mNoTransactionsBecause="); 1027 writer.println(mNoTransactionsBecause); 1028 } 1029 if (mAvailIndices != null && mAvailIndices.size() > 0) { 1030 writer.print(prefix); writer.print(" mAvailIndices: "); 1031 writer.println(Arrays.toString(mAvailIndices.toArray())); 1032 } 1033 } 1034 1035 static final Interpolator DECELERATE_QUINT = new DecelerateInterpolator(2.5f); 1036 static final Interpolator DECELERATE_CUBIC = new DecelerateInterpolator(1.5f); 1037 static final Interpolator ACCELERATE_QUINT = new AccelerateInterpolator(2.5f); 1038 static final Interpolator ACCELERATE_CUBIC = new AccelerateInterpolator(1.5f); 1039 1040 static final int ANIM_DUR = 220; 1041 1042 static Animation makeOpenCloseAnimation(Context context, float startScale, 1043 float endScale, float startAlpha, float endAlpha) { 1044 AnimationSet set = new AnimationSet(false); 1045 ScaleAnimation scale = new ScaleAnimation(startScale, endScale, startScale, endScale, 1046 Animation.RELATIVE_TO_SELF, .5f, Animation.RELATIVE_TO_SELF, .5f); 1047 scale.setInterpolator(DECELERATE_QUINT); 1048 scale.setDuration(ANIM_DUR); 1049 set.addAnimation(scale); 1050 AlphaAnimation alpha = new AlphaAnimation(startAlpha, endAlpha); 1051 alpha.setInterpolator(DECELERATE_CUBIC); 1052 alpha.setDuration(ANIM_DUR); 1053 set.addAnimation(alpha); 1054 return set; 1055 } 1056 1057 static Animation makeFadeAnimation(Context context, float start, float end) { 1058 AlphaAnimation anim = new AlphaAnimation(start, end); 1059 anim.setInterpolator(DECELERATE_CUBIC); 1060 anim.setDuration(ANIM_DUR); 1061 return anim; 1062 } 1063 1064 Animation loadAnimation(Fragment fragment, int transit, boolean enter, 1065 int transitionStyle) { 1066 Animation animObj = fragment.onCreateAnimation(transit, enter, fragment.getNextAnim()); 1067 if (animObj != null) { 1068 return animObj; 1069 } 1070 1071 if (fragment.getNextAnim() != 0) { 1072 Animation anim = AnimationUtils.loadAnimation(mHost.getContext(), 1073 fragment.getNextAnim()); 1074 if (anim != null) { 1075 return anim; 1076 } 1077 } 1078 1079 if (transit == 0) { 1080 return null; 1081 } 1082 1083 int styleIndex = transitToStyleIndex(transit, enter); 1084 if (styleIndex < 0) { 1085 return null; 1086 } 1087 1088 switch (styleIndex) { 1089 case ANIM_STYLE_OPEN_ENTER: 1090 return makeOpenCloseAnimation(mHost.getContext(), 1.125f, 1.0f, 0, 1); 1091 case ANIM_STYLE_OPEN_EXIT: 1092 return makeOpenCloseAnimation(mHost.getContext(), 1.0f, .975f, 1, 0); 1093 case ANIM_STYLE_CLOSE_ENTER: 1094 return makeOpenCloseAnimation(mHost.getContext(), .975f, 1.0f, 0, 1); 1095 case ANIM_STYLE_CLOSE_EXIT: 1096 return makeOpenCloseAnimation(mHost.getContext(), 1.0f, 1.075f, 1, 0); 1097 case ANIM_STYLE_FADE_ENTER: 1098 return makeFadeAnimation(mHost.getContext(), 0, 1); 1099 case ANIM_STYLE_FADE_EXIT: 1100 return makeFadeAnimation(mHost.getContext(), 1, 0); 1101 } 1102 1103 if (transitionStyle == 0 && mHost.onHasWindowAnimations()) { 1104 transitionStyle = mHost.onGetWindowAnimations(); 1105 } 1106 if (transitionStyle == 0) { 1107 return null; 1108 } 1109 1110 //TypedArray attrs = mActivity.obtainStyledAttributes(transitionStyle, 1111 // com.android.internal.R.styleable.FragmentAnimation); 1112 //int anim = attrs.getResourceId(styleIndex, 0); 1113 //attrs.recycle(); 1114 1115 //if (anim == 0) { 1116 // return null; 1117 //} 1118 1119 //return AnimatorInflater.loadAnimator(mActivity, anim); 1120 return null; 1121 } 1122 1123 public void performPendingDeferredStart(Fragment f) { 1124 if (f.mDeferStart) { 1125 if (mExecutingActions) { 1126 // Wait until we're done executing our pending transactions 1127 mHavePendingDeferredStart = true; 1128 return; 1129 } 1130 f.mDeferStart = false; 1131 moveToState(f, mCurState, 0, 0, false); 1132 } 1133 } 1134 1135 /** 1136 * Sets the to be animated view on hardware layer during the animation. Note 1137 * that calling this will replace any existing animation listener on the animation 1138 * with a new one, as animations do not support more than one listeners. Therefore, 1139 * animations that already have listeners should do the layer change operations 1140 * in their existing listeners, rather than calling this function. 1141 */ 1142 private void setHWLayerAnimListenerIfAlpha(final View v, Animation anim) { 1143 if (v == null || anim == null) { 1144 return; 1145 } 1146 if (shouldRunOnHWLayer(v, anim)) { 1147 AnimationListener originalListener = null; 1148 try { 1149 if (sAnimationListenerField == null) { 1150 sAnimationListenerField = Animation.class.getDeclaredField("mListener"); 1151 sAnimationListenerField.setAccessible(true); 1152 } 1153 originalListener = (AnimationListener) sAnimationListenerField.get(anim); 1154 } catch (NoSuchFieldException e) { 1155 Log.e(TAG, "No field with the name mListener is found in Animation class", e); 1156 } catch (IllegalAccessException e) { 1157 Log.e(TAG, "Cannot access Animation's mListener field", e); 1158 } 1159 // If there's already a listener set on the animation, we need wrap the new listener 1160 // around the existing listener, so that they will both get animation listener 1161 // callbacks. 1162 ViewCompat.setLayerType(v, ViewCompat.LAYER_TYPE_HARDWARE, null); 1163 anim.setAnimationListener(new AnimateOnHWLayerIfNeededListener(v, anim, 1164 originalListener)); 1165 } 1166 } 1167 1168 boolean isStateAtLeast(int state) { 1169 return mCurState >= state; 1170 } 1171 1172 void moveToState(Fragment f, int newState, int transit, int transitionStyle, 1173 boolean keepActive) { 1174 // Fragments that are not currently added will sit in the onCreate() state. 1175 if ((!f.mAdded || f.mDetached) && newState > Fragment.CREATED) { 1176 newState = Fragment.CREATED; 1177 } 1178 if (f.mRemoving && newState > f.mState) { 1179 // While removing a fragment, we can't change it to a higher state. 1180 newState = f.mState; 1181 } 1182 // Defer start if requested; don't allow it to move to STARTED or higher 1183 // if it's not already started. 1184 if (f.mDeferStart && f.mState < Fragment.STARTED && newState > Fragment.STOPPED) { 1185 newState = Fragment.STOPPED; 1186 } 1187 if (f.mState < newState) { 1188 // For fragments that are created from a layout, when restoring from 1189 // state we don't want to allow them to be created until they are 1190 // being reloaded from the layout. 1191 if (f.mFromLayout && !f.mInLayout) { 1192 return; 1193 } 1194 if (f.getAnimatingAway() != null) { 1195 // The fragment is currently being animated... but! Now we 1196 // want to move our state back up. Give up on waiting for the 1197 // animation, move to whatever the final state should be once 1198 // the animation is done, and then we can proceed from there. 1199 f.setAnimatingAway(null); 1200 moveToState(f, f.getStateAfterAnimating(), 0, 0, true); 1201 } 1202 switch (f.mState) { 1203 case Fragment.INITIALIZING: 1204 if (DEBUG) Log.v(TAG, "moveto CREATED: " + f); 1205 if (f.mSavedFragmentState != null) { 1206 f.mSavedFragmentState.setClassLoader(mHost.getContext().getClassLoader()); 1207 f.mSavedViewState = f.mSavedFragmentState.getSparseParcelableArray( 1208 FragmentManagerImpl.VIEW_STATE_TAG); 1209 f.mTarget = getFragment(f.mSavedFragmentState, 1210 FragmentManagerImpl.TARGET_STATE_TAG); 1211 if (f.mTarget != null) { 1212 f.mTargetRequestCode = f.mSavedFragmentState.getInt( 1213 FragmentManagerImpl.TARGET_REQUEST_CODE_STATE_TAG, 0); 1214 } 1215 f.mUserVisibleHint = f.mSavedFragmentState.getBoolean( 1216 FragmentManagerImpl.USER_VISIBLE_HINT_TAG, true); 1217 if (!f.mUserVisibleHint) { 1218 f.mDeferStart = true; 1219 if (newState > Fragment.STOPPED) { 1220 newState = Fragment.STOPPED; 1221 } 1222 } 1223 } 1224 f.mHost = mHost; 1225 f.mParentFragment = mParent; 1226 f.mFragmentManager = mParent != null 1227 ? mParent.mChildFragmentManager : mHost.getFragmentManagerImpl(); 1228 dispatchOnFragmentPreAttached(f, mHost.getContext(), false); 1229 f.mCalled = false; 1230 f.onAttach(mHost.getContext()); 1231 if (!f.mCalled) { 1232 throw new SuperNotCalledException("Fragment " + f 1233 + " did not call through to super.onAttach()"); 1234 } 1235 if (f.mParentFragment == null) { 1236 mHost.onAttachFragment(f); 1237 } else { 1238 f.mParentFragment.onAttachFragment(f); 1239 } 1240 dispatchOnFragmentAttached(f, mHost.getContext(), false); 1241 1242 if (!f.mRetaining) { 1243 f.performCreate(f.mSavedFragmentState); 1244 dispatchOnFragmentCreated(f, f.mSavedFragmentState, false); 1245 } else { 1246 f.restoreChildFragmentState(f.mSavedFragmentState); 1247 f.mState = Fragment.CREATED; 1248 } 1249 f.mRetaining = false; 1250 if (f.mFromLayout) { 1251 // For fragments that are part of the content view 1252 // layout, we need to instantiate the view immediately 1253 // and the inflater will take care of adding it. 1254 f.mView = f.performCreateView(f.getLayoutInflater( 1255 f.mSavedFragmentState), null, f.mSavedFragmentState); 1256 if (f.mView != null) { 1257 f.mInnerView = f.mView; 1258 if (Build.VERSION.SDK_INT >= 11) { 1259 ViewCompat.setSaveFromParentEnabled(f.mView, false); 1260 } else { 1261 f.mView = NoSaveStateFrameLayout.wrap(f.mView); 1262 } 1263 if (f.mHidden) f.mView.setVisibility(View.GONE); 1264 f.onViewCreated(f.mView, f.mSavedFragmentState); 1265 dispatchOnFragmentViewCreated(f, f.mView, f.mSavedFragmentState, false); 1266 } else { 1267 f.mInnerView = null; 1268 } 1269 } 1270 case Fragment.CREATED: 1271 if (newState > Fragment.CREATED) { 1272 if (DEBUG) Log.v(TAG, "moveto ACTIVITY_CREATED: " + f); 1273 if (!f.mFromLayout) { 1274 ViewGroup container = null; 1275 if (f.mContainerId != 0) { 1276 if (f.mContainerId == View.NO_ID) { 1277 throwException(new IllegalArgumentException( 1278 "Cannot create fragment " 1279 + f 1280 + " for a container view with no id")); 1281 } 1282 container = (ViewGroup) mContainer.onFindViewById(f.mContainerId); 1283 if (container == null && !f.mRestored) { 1284 String resName; 1285 try { 1286 resName = f.getResources().getResourceName(f.mContainerId); 1287 } catch (NotFoundException e) { 1288 resName = "unknown"; 1289 } 1290 throwException(new IllegalArgumentException( 1291 "No view found for id 0x" 1292 + Integer.toHexString(f.mContainerId) + " (" 1293 + resName 1294 + ") for fragment " + f)); 1295 } 1296 } 1297 f.mContainer = container; 1298 f.mView = f.performCreateView(f.getLayoutInflater( 1299 f.mSavedFragmentState), container, f.mSavedFragmentState); 1300 if (f.mView != null) { 1301 f.mInnerView = f.mView; 1302 if (Build.VERSION.SDK_INT >= 11) { 1303 ViewCompat.setSaveFromParentEnabled(f.mView, false); 1304 } else { 1305 f.mView = NoSaveStateFrameLayout.wrap(f.mView); 1306 } 1307 if (container != null) { 1308 container.addView(f.mView); 1309 f.mIsNewlyAdded = true; 1310 } 1311 if (f.mHidden) { 1312 f.mView.setVisibility(View.GONE); 1313 f.mIsNewlyAdded = false; // No animation 1314 } 1315 f.onViewCreated(f.mView, f.mSavedFragmentState); 1316 dispatchOnFragmentViewCreated(f, f.mView, f.mSavedFragmentState, 1317 false); 1318 } else { 1319 f.mInnerView = null; 1320 } 1321 } 1322 1323 f.performActivityCreated(f.mSavedFragmentState); 1324 dispatchOnFragmentActivityCreated(f, f.mSavedFragmentState, false); 1325 if (f.mView != null) { 1326 f.restoreViewState(f.mSavedFragmentState); 1327 } 1328 f.mSavedFragmentState = null; 1329 } 1330 case Fragment.ACTIVITY_CREATED: 1331 if (newState > Fragment.ACTIVITY_CREATED) { 1332 f.mState = Fragment.STOPPED; 1333 } 1334 case Fragment.STOPPED: 1335 if (newState > Fragment.STOPPED) { 1336 if (DEBUG) Log.v(TAG, "moveto STARTED: " + f); 1337 f.performStart(); 1338 dispatchOnFragmentStarted(f, false); 1339 } 1340 case Fragment.STARTED: 1341 if (newState > Fragment.STARTED) { 1342 if (DEBUG) Log.v(TAG, "moveto RESUMED: " + f); 1343 f.performResume(); 1344 dispatchOnFragmentResumed(f, false); 1345 f.mSavedFragmentState = null; 1346 f.mSavedViewState = null; 1347 } 1348 } 1349 } else if (f.mState > newState) { 1350 switch (f.mState) { 1351 case Fragment.RESUMED: 1352 if (newState < Fragment.RESUMED) { 1353 if (DEBUG) Log.v(TAG, "movefrom RESUMED: " + f); 1354 f.performPause(); 1355 dispatchOnFragmentPaused(f, false); 1356 } 1357 case Fragment.STARTED: 1358 if (newState < Fragment.STARTED) { 1359 if (DEBUG) Log.v(TAG, "movefrom STARTED: " + f); 1360 f.performStop(); 1361 dispatchOnFragmentStopped(f, false); 1362 } 1363 case Fragment.STOPPED: 1364 if (newState < Fragment.STOPPED) { 1365 if (DEBUG) Log.v(TAG, "movefrom STOPPED: " + f); 1366 f.performReallyStop(); 1367 } 1368 case Fragment.ACTIVITY_CREATED: 1369 if (newState < Fragment.ACTIVITY_CREATED) { 1370 if (DEBUG) Log.v(TAG, "movefrom ACTIVITY_CREATED: " + f); 1371 if (f.mView != null) { 1372 // Need to save the current view state if not 1373 // done already. 1374 if (mHost.onShouldSaveFragmentState(f) && f.mSavedViewState == null) { 1375 saveFragmentViewState(f); 1376 } 1377 } 1378 f.performDestroyView(); 1379 dispatchOnFragmentViewDestroyed(f, false); 1380 if (f.mView != null && f.mContainer != null) { 1381 Animation anim = null; 1382 if (mCurState > Fragment.INITIALIZING && !mDestroyed 1383 && f.mView.getVisibility() == View.VISIBLE) { 1384 anim = loadAnimation(f, transit, false, 1385 transitionStyle); 1386 } 1387 if (anim != null) { 1388 final Fragment fragment = f; 1389 f.setAnimatingAway(f.mView); 1390 f.setStateAfterAnimating(newState); 1391 final View viewToAnimate = f.mView; 1392 anim.setAnimationListener(new AnimateOnHWLayerIfNeededListener( 1393 viewToAnimate, anim) { 1394 @Override 1395 public void onAnimationEnd(Animation animation) { 1396 super.onAnimationEnd(animation); 1397 if (fragment.getAnimatingAway() != null) { 1398 fragment.setAnimatingAway(null); 1399 moveToState(fragment, fragment.getStateAfterAnimating(), 1400 0, 0, false); 1401 } 1402 } 1403 }); 1404 f.mView.startAnimation(anim); 1405 } 1406 f.mContainer.removeView(f.mView); 1407 } 1408 f.mContainer = null; 1409 f.mView = null; 1410 f.mInnerView = null; 1411 } 1412 case Fragment.CREATED: 1413 if (newState < Fragment.CREATED) { 1414 if (mDestroyed) { 1415 if (f.getAnimatingAway() != null) { 1416 // The fragment's containing activity is 1417 // being destroyed, but this fragment is 1418 // currently animating away. Stop the 1419 // animation right now -- it is not needed, 1420 // and we can't wait any more on destroying 1421 // the fragment. 1422 View v = f.getAnimatingAway(); 1423 f.setAnimatingAway(null); 1424 v.clearAnimation(); 1425 } 1426 } 1427 if (f.getAnimatingAway() != null) { 1428 // We are waiting for the fragment's view to finish 1429 // animating away. Just make a note of the state 1430 // the fragment now should move to once the animation 1431 // is done. 1432 f.setStateAfterAnimating(newState); 1433 newState = Fragment.CREATED; 1434 } else { 1435 if (DEBUG) Log.v(TAG, "movefrom CREATED: " + f); 1436 if (!f.mRetaining) { 1437 f.performDestroy(); 1438 dispatchOnFragmentDestroyed(f, false); 1439 } else { 1440 f.mState = Fragment.INITIALIZING; 1441 } 1442 1443 f.performDetach(); 1444 dispatchOnFragmentDetached(f, false); 1445 if (!keepActive) { 1446 if (!f.mRetaining) { 1447 makeInactive(f); 1448 } else { 1449 f.mHost = null; 1450 f.mParentFragment = null; 1451 f.mFragmentManager = null; 1452 } 1453 } 1454 } 1455 } 1456 } 1457 } 1458 1459 if (f.mState != newState) { 1460 Log.w(TAG, "moveToState: Fragment state for " + f + " not updated inline; " 1461 + "expected state " + newState + " found " + f.mState); 1462 f.mState = newState; 1463 } 1464 } 1465 1466 void moveToState(Fragment f) { 1467 moveToState(f, mCurState, 0, 0, false); 1468 } 1469 1470 /** 1471 * Fragments that have been shown or hidden don't have their visibility changed or 1472 * animations run during the {@link #showFragment(Fragment)} or {@link #hideFragment(Fragment)} 1473 * calls. After fragments are brought to their final state in 1474 * {@link #moveFragmentToExpectedState(Fragment)} the fragments that have been shown or 1475 * hidden must have their visibility changed and their animations started here. 1476 * 1477 * @param fragment The fragment with mHiddenChanged = true that should change its View's 1478 * visibility and start the show or hide animation. 1479 */ 1480 void completeShowHideFragment(final Fragment fragment) { 1481 if (fragment.mView != null) { 1482 Animation anim = loadAnimation(fragment, fragment.getNextTransition(), 1483 !fragment.mHidden, fragment.getNextTransitionStyle()); 1484 if (anim != null) { 1485 setHWLayerAnimListenerIfAlpha(fragment.mView, anim); 1486 fragment.mView.startAnimation(anim); 1487 setHWLayerAnimListenerIfAlpha(fragment.mView, anim); 1488 anim.start(); 1489 } 1490 final int visibility = fragment.mHidden && !fragment.isHideReplaced() 1491 ? View.GONE 1492 : View.VISIBLE; 1493 fragment.mView.setVisibility(visibility); 1494 if (fragment.isHideReplaced()) { 1495 fragment.setHideReplaced(false); 1496 } 1497 } 1498 if (fragment.mAdded && fragment.mHasMenu && fragment.mMenuVisible) { 1499 mNeedMenuInvalidate = true; 1500 } 1501 fragment.mHiddenChanged = false; 1502 fragment.onHiddenChanged(fragment.mHidden); 1503 } 1504 1505 /** 1506 * Moves a fragment to its expected final state or the fragment manager's state, depending 1507 * on whether the fragment manager's state is raised properly. 1508 * 1509 * @param f The fragment to change. 1510 */ 1511 void moveFragmentToExpectedState(Fragment f) { 1512 if (f == null) { 1513 return; 1514 } 1515 int nextState = mCurState; 1516 if (f.mRemoving) { 1517 if (f.isInBackStack()) { 1518 nextState = Fragment.CREATED; 1519 } else { 1520 nextState = Fragment.INITIALIZING; 1521 } 1522 } 1523 moveToState(f, nextState, f.getNextTransition(), f.getNextTransitionStyle(), false); 1524 1525 if (f.mView != null) { 1526 // Move the view if it is out of order 1527 Fragment underFragment = findFragmentUnder(f); 1528 if (underFragment != null) { 1529 final View underView = underFragment.mView; 1530 // make sure this fragment is in the right order. 1531 final ViewGroup container = f.mContainer; 1532 int underIndex = container.indexOfChild(underView); 1533 int viewIndex = container.indexOfChild(f.mView); 1534 if (viewIndex < underIndex) { 1535 container.removeViewAt(viewIndex); 1536 container.addView(f.mView, underIndex); 1537 } 1538 } 1539 if (f.mIsNewlyAdded && f.mContainer != null) { 1540 // Make it visible and run the animations 1541 f.mView.setVisibility(View.VISIBLE); 1542 f.mIsNewlyAdded = false; 1543 // run animations: 1544 Animation anim = loadAnimation(f, f.getNextTransition(), true, 1545 f.getNextTransitionStyle()); 1546 if (anim != null) { 1547 setHWLayerAnimListenerIfAlpha(f.mView, anim); 1548 f.mView.startAnimation(anim); 1549 } 1550 } 1551 } 1552 if (f.mHiddenChanged) { 1553 completeShowHideFragment(f); 1554 } 1555 } 1556 1557 void moveToState(int newState) { 1558 if (mHost == null && newState != Fragment.INITIALIZING) { 1559 throw new IllegalStateException("No activity"); 1560 } 1561 1562 mCurState = newState; 1563 1564 if (mActive != null) { 1565 boolean loadersRunning = false; 1566 1567 // Must add them in the proper order. mActive fragments may be out of order 1568 if (mAdded != null) { 1569 final int numAdded = mAdded.size(); 1570 for (int i = 0; i < numAdded; i++) { 1571 Fragment f = mAdded.get(i); 1572 moveFragmentToExpectedState(f); 1573 if (f.mLoaderManager != null) { 1574 loadersRunning |= f.mLoaderManager.hasRunningLoaders(); 1575 } 1576 } 1577 } 1578 1579 // Now iterate through all active fragments. These will include those that are removed 1580 // and detached. 1581 final int numActive = mActive.size(); 1582 for (int i = 0; i < numActive; i++) { 1583 Fragment f = mActive.get(i); 1584 if (f != null && (f.mRemoving || f.mDetached) && !f.mIsNewlyAdded) { 1585 moveFragmentToExpectedState(f); 1586 if (f.mLoaderManager != null) { 1587 loadersRunning |= f.mLoaderManager.hasRunningLoaders(); 1588 } 1589 } 1590 } 1591 1592 if (!loadersRunning) { 1593 startPendingDeferredFragments(); 1594 } 1595 1596 if (mNeedMenuInvalidate && mHost != null && mCurState == Fragment.RESUMED) { 1597 mHost.onSupportInvalidateOptionsMenu(); 1598 mNeedMenuInvalidate = false; 1599 } 1600 } 1601 } 1602 1603 void startPendingDeferredFragments() { 1604 if (mActive == null) return; 1605 1606 for (int i=0; i<mActive.size(); i++) { 1607 Fragment f = mActive.get(i); 1608 if (f != null) { 1609 performPendingDeferredStart(f); 1610 } 1611 } 1612 } 1613 1614 void makeActive(Fragment f) { 1615 if (f.mIndex >= 0) { 1616 return; 1617 } 1618 1619 if (mAvailIndices == null || mAvailIndices.size() <= 0) { 1620 if (mActive == null) { 1621 mActive = new ArrayList<Fragment>(); 1622 } 1623 f.setIndex(mActive.size(), mParent); 1624 mActive.add(f); 1625 1626 } else { 1627 f.setIndex(mAvailIndices.remove(mAvailIndices.size()-1), mParent); 1628 mActive.set(f.mIndex, f); 1629 } 1630 if (DEBUG) Log.v(TAG, "Allocated fragment index " + f); 1631 } 1632 1633 void makeInactive(Fragment f) { 1634 if (f.mIndex < 0) { 1635 return; 1636 } 1637 1638 if (DEBUG) Log.v(TAG, "Freeing fragment index " + f); 1639 mActive.set(f.mIndex, null); 1640 if (mAvailIndices == null) { 1641 mAvailIndices = new ArrayList<Integer>(); 1642 } 1643 mAvailIndices.add(f.mIndex); 1644 mHost.inactivateFragment(f.mWho); 1645 f.initState(); 1646 } 1647 1648 public void addFragment(Fragment fragment, boolean moveToStateNow) { 1649 if (mAdded == null) { 1650 mAdded = new ArrayList<Fragment>(); 1651 } 1652 if (DEBUG) Log.v(TAG, "add: " + fragment); 1653 makeActive(fragment); 1654 if (!fragment.mDetached) { 1655 if (mAdded.contains(fragment)) { 1656 throw new IllegalStateException("Fragment already added: " + fragment); 1657 } 1658 mAdded.add(fragment); 1659 fragment.mAdded = true; 1660 fragment.mRemoving = false; 1661 if (fragment.mView == null) { 1662 fragment.mHiddenChanged = false; 1663 } 1664 if (fragment.mHasMenu && fragment.mMenuVisible) { 1665 mNeedMenuInvalidate = true; 1666 } 1667 if (moveToStateNow) { 1668 moveToState(fragment); 1669 } 1670 } 1671 } 1672 1673 public void removeFragment(Fragment fragment) { 1674 if (DEBUG) Log.v(TAG, "remove: " + fragment + " nesting=" + fragment.mBackStackNesting); 1675 final boolean inactive = !fragment.isInBackStack(); 1676 if (!fragment.mDetached || inactive) { 1677 if (mAdded != null) { 1678 mAdded.remove(fragment); 1679 } 1680 if (fragment.mHasMenu && fragment.mMenuVisible) { 1681 mNeedMenuInvalidate = true; 1682 } 1683 fragment.mAdded = false; 1684 fragment.mRemoving = true; 1685 } 1686 } 1687 1688 /** 1689 * Marks a fragment as hidden to be later animated in with 1690 * {@link #completeShowHideFragment(Fragment)}. 1691 * 1692 * @param fragment The fragment to be shown. 1693 */ 1694 public void hideFragment(Fragment fragment) { 1695 if (DEBUG) Log.v(TAG, "hide: " + fragment); 1696 if (!fragment.mHidden) { 1697 fragment.mHidden = true; 1698 // Toggle hidden changed so that if a fragment goes through show/hide/show 1699 // it doesn't go through the animation. 1700 fragment.mHiddenChanged = !fragment.mHiddenChanged; 1701 } 1702 } 1703 1704 /** 1705 * Marks a fragment as shown to be later animated in with 1706 * {@link #completeShowHideFragment(Fragment)}. 1707 * 1708 * @param fragment The fragment to be shown. 1709 */ 1710 public void showFragment(Fragment fragment) { 1711 if (DEBUG) Log.v(TAG, "show: " + fragment); 1712 if (fragment.mHidden) { 1713 fragment.mHidden = false; 1714 // Toggle hidden changed so that if a fragment goes through show/hide/show 1715 // it doesn't go through the animation. 1716 fragment.mHiddenChanged = !fragment.mHiddenChanged; 1717 } 1718 } 1719 1720 public void detachFragment(Fragment fragment) { 1721 if (DEBUG) Log.v(TAG, "detach: " + fragment); 1722 if (!fragment.mDetached) { 1723 fragment.mDetached = true; 1724 if (fragment.mAdded) { 1725 // We are not already in back stack, so need to remove the fragment. 1726 if (mAdded != null) { 1727 if (DEBUG) Log.v(TAG, "remove from detach: " + fragment); 1728 mAdded.remove(fragment); 1729 } 1730 if (fragment.mHasMenu && fragment.mMenuVisible) { 1731 mNeedMenuInvalidate = true; 1732 } 1733 fragment.mAdded = false; 1734 } 1735 } 1736 } 1737 1738 public void attachFragment(Fragment fragment) { 1739 if (DEBUG) Log.v(TAG, "attach: " + fragment); 1740 if (fragment.mDetached) { 1741 fragment.mDetached = false; 1742 if (!fragment.mAdded) { 1743 if (mAdded == null) { 1744 mAdded = new ArrayList<Fragment>(); 1745 } 1746 if (mAdded.contains(fragment)) { 1747 throw new IllegalStateException("Fragment already added: " + fragment); 1748 } 1749 if (DEBUG) Log.v(TAG, "add from attach: " + fragment); 1750 mAdded.add(fragment); 1751 fragment.mAdded = true; 1752 if (fragment.mHasMenu && fragment.mMenuVisible) { 1753 mNeedMenuInvalidate = true; 1754 } 1755 } 1756 } 1757 } 1758 1759 @Override 1760 public Fragment findFragmentById(int id) { 1761 if (mAdded != null) { 1762 // First look through added fragments. 1763 for (int i=mAdded.size()-1; i>=0; i--) { 1764 Fragment f = mAdded.get(i); 1765 if (f != null && f.mFragmentId == id) { 1766 return f; 1767 } 1768 } 1769 } 1770 if (mActive != null) { 1771 // Now for any known fragment. 1772 for (int i=mActive.size()-1; i>=0; i--) { 1773 Fragment f = mActive.get(i); 1774 if (f != null && f.mFragmentId == id) { 1775 return f; 1776 } 1777 } 1778 } 1779 return null; 1780 } 1781 1782 @Override 1783 public Fragment findFragmentByTag(String tag) { 1784 if (mAdded != null && tag != null) { 1785 // First look through added fragments. 1786 for (int i=mAdded.size()-1; i>=0; i--) { 1787 Fragment f = mAdded.get(i); 1788 if (f != null && tag.equals(f.mTag)) { 1789 return f; 1790 } 1791 } 1792 } 1793 if (mActive != null && tag != null) { 1794 // Now for any known fragment. 1795 for (int i=mActive.size()-1; i>=0; i--) { 1796 Fragment f = mActive.get(i); 1797 if (f != null && tag.equals(f.mTag)) { 1798 return f; 1799 } 1800 } 1801 } 1802 return null; 1803 } 1804 1805 public Fragment findFragmentByWho(String who) { 1806 if (mActive != null && who != null) { 1807 for (int i=mActive.size()-1; i>=0; i--) { 1808 Fragment f = mActive.get(i); 1809 if (f != null && (f=f.findFragmentByWho(who)) != null) { 1810 return f; 1811 } 1812 } 1813 } 1814 return null; 1815 } 1816 1817 private void checkStateLoss() { 1818 if (mStateSaved) { 1819 throw new IllegalStateException( 1820 "Can not perform this action after onSaveInstanceState"); 1821 } 1822 if (mNoTransactionsBecause != null) { 1823 throw new IllegalStateException( 1824 "Can not perform this action inside of " + mNoTransactionsBecause); 1825 } 1826 } 1827 1828 /** 1829 * Adds an action to the queue of pending actions. 1830 * 1831 * @param action the action to add 1832 * @param allowStateLoss whether to allow loss of state information 1833 * @throws IllegalStateException if the activity has been destroyed 1834 */ 1835 public void enqueueAction(OpGenerator action, boolean allowStateLoss) { 1836 if (!allowStateLoss) { 1837 checkStateLoss(); 1838 } 1839 synchronized (this) { 1840 if (mDestroyed || mHost == null) { 1841 throw new IllegalStateException("Activity has been destroyed"); 1842 } 1843 if (mPendingActions == null) { 1844 mPendingActions = new ArrayList<>(); 1845 } 1846 mPendingActions.add(action); 1847 scheduleCommit(); 1848 } 1849 } 1850 1851 /** 1852 * Schedules the execution when one hasn't been scheduled already. This should happen 1853 * the first time {@link #enqueueAction(OpGenerator, boolean)} is called or when 1854 * a postponed transaction has been started with 1855 * {@link Fragment#startPostponedEnterTransition()} 1856 */ 1857 private void scheduleCommit() { 1858 synchronized (this) { 1859 boolean postponeReady = 1860 mPostponedTransactions != null && !mPostponedTransactions.isEmpty(); 1861 boolean pendingReady = mPendingActions != null && mPendingActions.size() == 1; 1862 if (postponeReady || pendingReady) { 1863 mHost.getHandler().removeCallbacks(mExecCommit); 1864 mHost.getHandler().post(mExecCommit); 1865 } 1866 } 1867 } 1868 1869 public int allocBackStackIndex(BackStackRecord bse) { 1870 synchronized (this) { 1871 if (mAvailBackStackIndices == null || mAvailBackStackIndices.size() <= 0) { 1872 if (mBackStackIndices == null) { 1873 mBackStackIndices = new ArrayList<BackStackRecord>(); 1874 } 1875 int index = mBackStackIndices.size(); 1876 if (DEBUG) Log.v(TAG, "Setting back stack index " + index + " to " + bse); 1877 mBackStackIndices.add(bse); 1878 return index; 1879 1880 } else { 1881 int index = mAvailBackStackIndices.remove(mAvailBackStackIndices.size()-1); 1882 if (DEBUG) Log.v(TAG, "Adding back stack index " + index + " with " + bse); 1883 mBackStackIndices.set(index, bse); 1884 return index; 1885 } 1886 } 1887 } 1888 1889 public void setBackStackIndex(int index, BackStackRecord bse) { 1890 synchronized (this) { 1891 if (mBackStackIndices == null) { 1892 mBackStackIndices = new ArrayList<BackStackRecord>(); 1893 } 1894 int N = mBackStackIndices.size(); 1895 if (index < N) { 1896 if (DEBUG) Log.v(TAG, "Setting back stack index " + index + " to " + bse); 1897 mBackStackIndices.set(index, bse); 1898 } else { 1899 while (N < index) { 1900 mBackStackIndices.add(null); 1901 if (mAvailBackStackIndices == null) { 1902 mAvailBackStackIndices = new ArrayList<Integer>(); 1903 } 1904 if (DEBUG) Log.v(TAG, "Adding available back stack index " + N); 1905 mAvailBackStackIndices.add(N); 1906 N++; 1907 } 1908 if (DEBUG) Log.v(TAG, "Adding back stack index " + index + " with " + bse); 1909 mBackStackIndices.add(bse); 1910 } 1911 } 1912 } 1913 1914 public void freeBackStackIndex(int index) { 1915 synchronized (this) { 1916 mBackStackIndices.set(index, null); 1917 if (mAvailBackStackIndices == null) { 1918 mAvailBackStackIndices = new ArrayList<Integer>(); 1919 } 1920 if (DEBUG) Log.v(TAG, "Freeing back stack index " + index); 1921 mAvailBackStackIndices.add(index); 1922 } 1923 } 1924 1925 /** 1926 * Broken out from exec*, this prepares for gathering and executing operations. 1927 * 1928 * @param allowStateLoss true if state loss should be ignored or false if it should be 1929 * checked. 1930 */ 1931 private void ensureExecReady(boolean allowStateLoss) { 1932 if (mExecutingActions) { 1933 throw new IllegalStateException("FragmentManager is already executing transactions"); 1934 } 1935 1936 if (Looper.myLooper() != mHost.getHandler().getLooper()) { 1937 throw new IllegalStateException("Must be called from main thread of fragment host"); 1938 } 1939 1940 if (!allowStateLoss) { 1941 checkStateLoss(); 1942 } 1943 1944 if (mTmpRecords == null) { 1945 mTmpRecords = new ArrayList<>(); 1946 mTmpIsPop = new ArrayList<>(); 1947 } 1948 executePostponedTransaction(null, null); 1949 } 1950 1951 public void execSingleAction(OpGenerator action, boolean allowStateLoss) { 1952 ensureExecReady(allowStateLoss); 1953 if (action.generateOps(mTmpRecords, mTmpIsPop)) { 1954 mExecutingActions = true; 1955 try { 1956 optimizeAndExecuteOps(mTmpRecords, mTmpIsPop); 1957 } finally { 1958 cleanupExec(); 1959 } 1960 } 1961 1962 doPendingDeferredStart(); 1963 } 1964 1965 /** 1966 * Broken out of exec*, this cleans up the mExecutingActions and the temporary structures 1967 * used in executing operations. 1968 */ 1969 private void cleanupExec() { 1970 mExecutingActions = false; 1971 mTmpIsPop.clear(); 1972 mTmpRecords.clear(); 1973 } 1974 1975 /** 1976 * Only call from main thread! 1977 */ 1978 public boolean execPendingActions() { 1979 ensureExecReady(true); 1980 1981 boolean didSomething = false; 1982 while (generateOpsForPendingActions(mTmpRecords, mTmpIsPop)) { 1983 mExecutingActions = true; 1984 try { 1985 optimizeAndExecuteOps(mTmpRecords, mTmpIsPop); 1986 } finally { 1987 cleanupExec(); 1988 } 1989 didSomething = true; 1990 } 1991 1992 doPendingDeferredStart(); 1993 1994 return didSomething; 1995 } 1996 1997 /** 1998 * Complete the execution of transactions that have previously been postponed, but are 1999 * now ready. 2000 */ 2001 private void executePostponedTransaction(ArrayList<BackStackRecord> records, 2002 ArrayList<Boolean> isRecordPop) { 2003 int numPostponed = mPostponedTransactions == null ? 0 : mPostponedTransactions.size(); 2004 for (int i = 0; i < numPostponed; i++) { 2005 StartEnterTransitionListener listener = mPostponedTransactions.get(i); 2006 if (records != null && !listener.mIsBack) { 2007 int index = records.indexOf(listener.mRecord); 2008 if (index != -1 && isRecordPop.get(index)) { 2009 listener.cancelTransaction(); 2010 continue; 2011 } 2012 } 2013 if (listener.isReady() || (records != null 2014 && listener.mRecord.interactsWith(records, 0, records.size()))) { 2015 mPostponedTransactions.remove(i); 2016 i--; 2017 numPostponed--; 2018 int index; 2019 if (records != null && !listener.mIsBack 2020 && (index = records.indexOf(listener.mRecord)) != -1 2021 && isRecordPop.get(index)) { 2022 // This is popping a postponed transaction 2023 listener.cancelTransaction(); 2024 } else { 2025 listener.completeTransaction(); 2026 } 2027 } 2028 } 2029 } 2030 2031 /** 2032 * Optimizes BackStackRecord operations. This method merges operations of proximate records 2033 * that allow optimization. See {@link FragmentTransaction#setAllowOptimization(boolean)}. 2034 * <p> 2035 * For example, a transaction that adds to the back stack and then another that pops that 2036 * back stack record will be optimized. 2037 * <p> 2038 * Likewise, two transactions committed that are executed at the same time will be optimized 2039 * as well as two pop operations executed together. 2040 * 2041 * @param records The records pending execution 2042 * @param isRecordPop The direction that these records are being run. 2043 */ 2044 private void optimizeAndExecuteOps(ArrayList<BackStackRecord> records, 2045 ArrayList<Boolean> isRecordPop) { 2046 if (records == null || records.isEmpty()) { 2047 return; 2048 } 2049 2050 if (isRecordPop == null || records.size() != isRecordPop.size()) { 2051 throw new IllegalStateException("Internal error with the back stack records"); 2052 } 2053 2054 // Force start of any postponed transactions that interact with scheduled transactions: 2055 executePostponedTransaction(records, isRecordPop); 2056 2057 final int numRecords = records.size(); 2058 int startIndex = 0; 2059 for (int recordNum = 0; recordNum < numRecords; recordNum++) { 2060 final boolean canOptimize = records.get(recordNum).mAllowOptimization; 2061 if (!canOptimize) { 2062 // execute all previous transactions 2063 if (startIndex != recordNum) { 2064 executeOpsTogether(records, isRecordPop, startIndex, recordNum); 2065 } 2066 // execute all unoptimized together 2067 int optimizeEnd; 2068 for (optimizeEnd = recordNum + 1; optimizeEnd < numRecords; optimizeEnd++) { 2069 if (records.get(optimizeEnd).mAllowOptimization) { 2070 break; 2071 } 2072 } 2073 executeOpsTogether(records, isRecordPop, recordNum, optimizeEnd); 2074 startIndex = optimizeEnd; 2075 recordNum = optimizeEnd - 1; 2076 } 2077 } 2078 if (startIndex != numRecords) { 2079 executeOpsTogether(records, isRecordPop, startIndex, numRecords); 2080 } 2081 } 2082 2083 /** 2084 * Optimizes a subset of a list of BackStackRecords, all of which either allow optimization or 2085 * do not allow optimization. 2086 * @param records A list of BackStackRecords that are to be optimized 2087 * @param isRecordPop The direction that these records are being run. 2088 * @param startIndex The index of the first record in <code>records</code> to be optimized 2089 * @param endIndex One more than the final record index in <code>records</code> to optimize. 2090 */ 2091 private void executeOpsTogether(ArrayList<BackStackRecord> records, 2092 ArrayList<Boolean> isRecordPop, int startIndex, int endIndex) { 2093 final boolean allowOptimization = records.get(startIndex).mAllowOptimization; 2094 boolean addToBackStack = false; 2095 if (mTmpAddedFragments == null) { 2096 mTmpAddedFragments = new ArrayList<>(); 2097 } else { 2098 mTmpAddedFragments.clear(); 2099 } 2100 if (mAdded != null) { 2101 mTmpAddedFragments.addAll(mAdded); 2102 } 2103 for (int recordNum = startIndex; recordNum < endIndex; recordNum++) { 2104 final BackStackRecord record = records.get(recordNum); 2105 final boolean isPop = isRecordPop.get(recordNum); 2106 if (!isPop) { 2107 record.expandReplaceOps(mTmpAddedFragments); 2108 } 2109 final int bumpAmount = isPop ? -1 : 1; 2110 record.bumpBackStackNesting(bumpAmount); 2111 addToBackStack = addToBackStack || record.mAddToBackStack; 2112 } 2113 mTmpAddedFragments.clear(); 2114 2115 if (!allowOptimization) { 2116 FragmentTransition.startTransitions(this, records, isRecordPop, startIndex, endIndex, 2117 false); 2118 } 2119 executeOps(records, isRecordPop, startIndex, endIndex); 2120 2121 int postponeIndex = endIndex; 2122 if (allowOptimization) { 2123 moveFragmentsToInvisible(); 2124 postponeIndex = postponePostponableTransactions(records, isRecordPop, 2125 startIndex, endIndex); 2126 } 2127 2128 if (postponeIndex != startIndex && allowOptimization) { 2129 // need to run something now 2130 FragmentTransition.startTransitions(this, records, isRecordPop, startIndex, 2131 postponeIndex, true); 2132 moveToState(mCurState); 2133 } 2134 2135 for (int recordNum = startIndex; recordNum < endIndex; recordNum++) { 2136 final BackStackRecord record = records.get(recordNum); 2137 final boolean isPop = isRecordPop.get(recordNum); 2138 if (isPop && record.mIndex >= 0) { 2139 freeBackStackIndex(record.mIndex); 2140 record.mIndex = -1; 2141 } 2142 } 2143 if (addToBackStack) { 2144 reportBackStackChanged(); 2145 } 2146 } 2147 2148 /** 2149 * Examine all transactions and determine which ones are marked as postponed. Those will 2150 * have their operations rolled back and moved to the end of the record list (up to endIndex). 2151 * It will also add the postponed transaction to the queue. 2152 * 2153 * @param records A list of BackStackRecords that should be checked. 2154 * @param isRecordPop The direction that these records are being run. 2155 * @param startIndex The index of the first record in <code>records</code> to be checked 2156 * @param endIndex One more than the final record index in <code>records</code> to be checked. 2157 * @return The index of the first postponed transaction or endIndex if no transaction was 2158 * postponed. 2159 */ 2160 private int postponePostponableTransactions(ArrayList<BackStackRecord> records, 2161 ArrayList<Boolean> isRecordPop, int startIndex, int endIndex) { 2162 int postponeIndex = endIndex; 2163 for (int i = endIndex - 1; i >= startIndex; i--) { 2164 final BackStackRecord record = records.get(i); 2165 final boolean isPop = isRecordPop.get(i); 2166 boolean isPostponed = record.isPostponed() 2167 && !record.interactsWith(records, i + 1, endIndex); 2168 if (isPostponed) { 2169 if (mPostponedTransactions == null) { 2170 mPostponedTransactions = new ArrayList<>(); 2171 } 2172 StartEnterTransitionListener listener = 2173 new StartEnterTransitionListener(record, isPop); 2174 mPostponedTransactions.add(listener); 2175 record.setOnStartPostponedListener(listener); 2176 2177 // roll back the transaction 2178 if (isPop) { 2179 record.executeOps(); 2180 } else { 2181 record.executePopOps(); 2182 } 2183 2184 // move to the end 2185 postponeIndex--; 2186 if (i != postponeIndex) { 2187 records.remove(i); 2188 records.add(postponeIndex, record); 2189 } 2190 2191 // different views may be visible now 2192 moveFragmentsToInvisible(); 2193 } 2194 } 2195 return postponeIndex; 2196 } 2197 2198 /** 2199 * When a postponed transaction is ready to be started, this completes the transaction, 2200 * removing, hiding, or showing views as well as starting the animations and transitions. 2201 * <p> 2202 * {@code runtransitions} is set to false when the transaction postponement was interrupted 2203 * abnormally -- normally by a new transaction being started that affects the postponed 2204 * transaction. 2205 * 2206 * @param record The transaction to run 2207 * @param isPop true if record is popping or false if it is adding 2208 * @param runTransitions true if the fragment transition should be run or false otherwise. 2209 * @param moveToState true if the state should be changed after executing the operations. 2210 * This is false when the transaction is canceled when a postponed 2211 * transaction is popped. 2212 */ 2213 private void completeExecute(BackStackRecord record, boolean isPop, boolean runTransitions, 2214 boolean moveToState) { 2215 ArrayList<BackStackRecord> records = new ArrayList<>(1); 2216 ArrayList<Boolean> isRecordPop = new ArrayList<>(1); 2217 records.add(record); 2218 isRecordPop.add(isPop); 2219 executeOps(records, isRecordPop, 0, 1); 2220 if (runTransitions) { 2221 FragmentTransition.startTransitions(this, records, isRecordPop, 0, 1, true); 2222 } 2223 if (moveToState) { 2224 moveToState(mCurState); 2225 } else if (mActive != null) { 2226 final int numActive = mActive.size(); 2227 for (int i = 0; i < numActive; i++) { 2228 // Allow added fragments to be removed during the pop since we aren't going 2229 // to move them to the final state with moveToState(mCurState). 2230 Fragment fragment = mActive.get(i); 2231 if (fragment.mView != null && fragment.mIsNewlyAdded 2232 && record.interactsWith(fragment.mContainerId)) { 2233 fragment.mIsNewlyAdded = false; 2234 } 2235 } 2236 } 2237 } 2238 2239 /** 2240 * Find a fragment within the fragment's container whose View should be below the passed 2241 * fragment. {@code null} is returned when the fragment has no View or if there should be 2242 * no fragment with a View below the given fragment. 2243 * 2244 * As an example, if mAdded has two Fragments with Views sharing the same container: 2245 * FragmentA 2246 * FragmentB 2247 * 2248 * Then, when processing FragmentB, FragmentA will be returned. If, however, FragmentA 2249 * had no View, null would be returned. 2250 * 2251 * @param f The fragment that may be on top of another fragment. 2252 * @return The fragment with a View under f, if one exists or null if f has no View or 2253 * there are no fragments with Views in the same container. 2254 */ 2255 private Fragment findFragmentUnder(Fragment f) { 2256 final ViewGroup container = f.mContainer; 2257 final View view = f.mView; 2258 2259 if (container == null || view == null) { 2260 return null; 2261 } 2262 2263 final int fragmentIndex = mAdded.indexOf(f); 2264 for (int i = fragmentIndex - 1; i >= 0; i--) { 2265 Fragment underFragment = mAdded.get(i); 2266 if (underFragment.mContainer == container && underFragment.mView != null) { 2267 // Found the fragment under this one 2268 return underFragment; 2269 } 2270 } 2271 return null; 2272 } 2273 2274 /** 2275 * Run the operations in the BackStackRecords, either to push or pop. 2276 * 2277 * @param records The list of records whose operations should be run. 2278 * @param isRecordPop The direction that these records are being run. 2279 * @param startIndex The index of the first entry in records to run. 2280 * @param endIndex One past the index of the final entry in records to run. 2281 */ 2282 private static void executeOps(ArrayList<BackStackRecord> records, 2283 ArrayList<Boolean> isRecordPop, int startIndex, int endIndex) { 2284 for (int i = startIndex; i < endIndex; i++) { 2285 final BackStackRecord record = records.get(i); 2286 final boolean isPop = isRecordPop.get(i); 2287 if (isPop) { 2288 record.executePopOps(); 2289 } else { 2290 record.executeOps(); 2291 } 2292 } 2293 } 2294 2295 /** 2296 * Ensure that fragments that are added are moved to at least the CREATED state. 2297 * Any newly-added Views are made INVISIBLE so that the Transaction can be postponed 2298 * with {@link Fragment#postponeEnterTransition()}. 2299 */ 2300 private void moveFragmentsToInvisible() { 2301 if (mCurState < Fragment.CREATED) { 2302 return; 2303 } 2304 // We want to leave the fragment in the started state 2305 final int state = Math.min(mCurState, Fragment.STARTED); 2306 final int numAdded = mAdded == null ? 0 : mAdded.size(); 2307 for (int i = 0; i < numAdded; i++) { 2308 Fragment fragment = mAdded.get(i); 2309 if (fragment.mState < state) { 2310 moveToState(fragment, state, fragment.getNextAnim(), fragment.getNextTransition(), 2311 false); 2312 if (fragment.mView != null && !fragment.mHidden && fragment.mIsNewlyAdded) { 2313 fragment.mView.setVisibility(View.INVISIBLE); 2314 } 2315 } 2316 } 2317 } 2318 2319 /** 2320 * Starts all postponed transactions regardless of whether they are ready or not. 2321 */ 2322 private void forcePostponedTransactions() { 2323 if (mPostponedTransactions != null) { 2324 while (!mPostponedTransactions.isEmpty()) { 2325 mPostponedTransactions.remove(0).completeTransaction(); 2326 } 2327 } 2328 } 2329 2330 /** 2331 * Ends the animations of fragments so that they immediately reach the end state. 2332 * This is used prior to saving the state so that the correct state is saved. 2333 */ 2334 private void endAnimatingAwayFragments() { 2335 final int numFragments = mActive == null ? 0 : mActive.size(); 2336 for (int i = 0; i < numFragments; i++) { 2337 Fragment fragment = mActive.get(i); 2338 if (fragment != null && fragment.getAnimatingAway() != null) { 2339 // Give up waiting for the animation and just end it. 2340 final int stateAfterAnimating = fragment.getStateAfterAnimating(); 2341 final View animatingAway = fragment.getAnimatingAway(); 2342 fragment.setAnimatingAway(null); 2343 animatingAway.clearAnimation(); 2344 moveToState(fragment, stateAfterAnimating, 0, 0, false); 2345 } 2346 } 2347 } 2348 2349 /** 2350 * Adds all records in the pending actions to records and whether they are add or pop 2351 * operations to isPop. After executing, the pending actions will be empty. 2352 * 2353 * @param records All pending actions will generate BackStackRecords added to this. 2354 * This contains the transactions, in order, to execute. 2355 * @param isPop All pending actions will generate booleans to add to this. This contains 2356 * an entry for each entry in records to indicate whether or not it is a 2357 * pop action. 2358 */ 2359 private boolean generateOpsForPendingActions(ArrayList<BackStackRecord> records, 2360 ArrayList<Boolean> isPop) { 2361 int numActions; 2362 synchronized (this) { 2363 if (mPendingActions == null || mPendingActions.size() == 0) { 2364 return false; 2365 } 2366 2367 numActions = mPendingActions.size(); 2368 for (int i = 0; i < numActions; i++) { 2369 mPendingActions.get(i).generateOps(records, isPop); 2370 } 2371 mPendingActions.clear(); 2372 mHost.getHandler().removeCallbacks(mExecCommit); 2373 } 2374 return numActions > 0; 2375 } 2376 2377 void doPendingDeferredStart() { 2378 if (mHavePendingDeferredStart) { 2379 boolean loadersRunning = false; 2380 for (int i = 0; i < mActive.size(); i++) { 2381 Fragment f = mActive.get(i); 2382 if (f != null && f.mLoaderManager != null) { 2383 loadersRunning |= f.mLoaderManager.hasRunningLoaders(); 2384 } 2385 } 2386 if (!loadersRunning) { 2387 mHavePendingDeferredStart = false; 2388 startPendingDeferredFragments(); 2389 } 2390 } 2391 } 2392 2393 void reportBackStackChanged() { 2394 if (mBackStackChangeListeners != null) { 2395 for (int i=0; i<mBackStackChangeListeners.size(); i++) { 2396 mBackStackChangeListeners.get(i).onBackStackChanged(); 2397 } 2398 } 2399 } 2400 2401 void addBackStackState(BackStackRecord state) { 2402 if (mBackStack == null) { 2403 mBackStack = new ArrayList<BackStackRecord>(); 2404 } 2405 mBackStack.add(state); 2406 reportBackStackChanged(); 2407 } 2408 2409 @SuppressWarnings("unused") 2410 boolean popBackStackState(ArrayList<BackStackRecord> records, ArrayList<Boolean> isRecordPop, 2411 String name, int id, int flags) { 2412 if (mBackStack == null) { 2413 return false; 2414 } 2415 if (name == null && id < 0 && (flags & POP_BACK_STACK_INCLUSIVE) == 0) { 2416 int last = mBackStack.size() - 1; 2417 if (last < 0) { 2418 return false; 2419 } 2420 records.add(mBackStack.remove(last)); 2421 isRecordPop.add(true); 2422 } else { 2423 int index = -1; 2424 if (name != null || id >= 0) { 2425 // If a name or ID is specified, look for that place in 2426 // the stack. 2427 index = mBackStack.size()-1; 2428 while (index >= 0) { 2429 BackStackRecord bss = mBackStack.get(index); 2430 if (name != null && name.equals(bss.getName())) { 2431 break; 2432 } 2433 if (id >= 0 && id == bss.mIndex) { 2434 break; 2435 } 2436 index--; 2437 } 2438 if (index < 0) { 2439 return false; 2440 } 2441 if ((flags&POP_BACK_STACK_INCLUSIVE) != 0) { 2442 index--; 2443 // Consume all following entries that match. 2444 while (index >= 0) { 2445 BackStackRecord bss = mBackStack.get(index); 2446 if ((name != null && name.equals(bss.getName())) 2447 || (id >= 0 && id == bss.mIndex)) { 2448 index--; 2449 continue; 2450 } 2451 break; 2452 } 2453 } 2454 } 2455 if (index == mBackStack.size()-1) { 2456 return false; 2457 } 2458 for (int i = mBackStack.size() - 1; i > index; i--) { 2459 records.add(mBackStack.remove(i)); 2460 isRecordPop.add(true); 2461 } 2462 } 2463 return true; 2464 } 2465 2466 FragmentManagerNonConfig retainNonConfig() { 2467 ArrayList<Fragment> fragments = null; 2468 ArrayList<FragmentManagerNonConfig> childFragments = null; 2469 if (mActive != null) { 2470 for (int i=0; i<mActive.size(); i++) { 2471 Fragment f = mActive.get(i); 2472 if (f != null) { 2473 if (f.mRetainInstance) { 2474 if (fragments == null) { 2475 fragments = new ArrayList<Fragment>(); 2476 } 2477 fragments.add(f); 2478 f.mRetaining = true; 2479 f.mTargetIndex = f.mTarget != null ? f.mTarget.mIndex : -1; 2480 if (DEBUG) Log.v(TAG, "retainNonConfig: keeping retained " + f); 2481 } 2482 boolean addedChild = false; 2483 if (f.mChildFragmentManager != null) { 2484 FragmentManagerNonConfig child = f.mChildFragmentManager.retainNonConfig(); 2485 if (child != null) { 2486 if (childFragments == null) { 2487 childFragments = new ArrayList<FragmentManagerNonConfig>(); 2488 for (int j = 0; j < i; j++) { 2489 childFragments.add(null); 2490 } 2491 } 2492 childFragments.add(child); 2493 addedChild = true; 2494 } 2495 } 2496 if (childFragments != null && !addedChild) { 2497 childFragments.add(null); 2498 } 2499 } 2500 } 2501 } 2502 if (fragments == null && childFragments == null) { 2503 return null; 2504 } 2505 return new FragmentManagerNonConfig(fragments, childFragments); 2506 } 2507 2508 void saveFragmentViewState(Fragment f) { 2509 if (f.mInnerView == null) { 2510 return; 2511 } 2512 if (mStateArray == null) { 2513 mStateArray = new SparseArray<Parcelable>(); 2514 } else { 2515 mStateArray.clear(); 2516 } 2517 f.mInnerView.saveHierarchyState(mStateArray); 2518 if (mStateArray.size() > 0) { 2519 f.mSavedViewState = mStateArray; 2520 mStateArray = null; 2521 } 2522 } 2523 2524 Bundle saveFragmentBasicState(Fragment f) { 2525 Bundle result = null; 2526 2527 if (mStateBundle == null) { 2528 mStateBundle = new Bundle(); 2529 } 2530 f.performSaveInstanceState(mStateBundle); 2531 dispatchOnFragmentSaveInstanceState(f, mStateBundle, false); 2532 if (!mStateBundle.isEmpty()) { 2533 result = mStateBundle; 2534 mStateBundle = null; 2535 } 2536 2537 if (f.mView != null) { 2538 saveFragmentViewState(f); 2539 } 2540 if (f.mSavedViewState != null) { 2541 if (result == null) { 2542 result = new Bundle(); 2543 } 2544 result.putSparseParcelableArray( 2545 FragmentManagerImpl.VIEW_STATE_TAG, f.mSavedViewState); 2546 } 2547 if (!f.mUserVisibleHint) { 2548 if (result == null) { 2549 result = new Bundle(); 2550 } 2551 // Only add this if it's not the default value 2552 result.putBoolean(FragmentManagerImpl.USER_VISIBLE_HINT_TAG, f.mUserVisibleHint); 2553 } 2554 2555 return result; 2556 } 2557 2558 Parcelable saveAllState() { 2559 // Make sure all pending operations have now been executed to get 2560 // our state update-to-date. 2561 forcePostponedTransactions(); 2562 endAnimatingAwayFragments(); 2563 execPendingActions(); 2564 2565 if (HONEYCOMB) { 2566 // As of Honeycomb, we save state after pausing. Prior to that 2567 // it is before pausing. With fragments this is an issue, since 2568 // there are many things you may do after pausing but before 2569 // stopping that change the fragment state. For those older 2570 // devices, we will not at this point say that we have saved 2571 // the state, so we will allow them to continue doing fragment 2572 // transactions. This retains the same semantics as Honeycomb, 2573 // though you do have the risk of losing the very most recent state 2574 // if the process is killed... we'll live with that. 2575 mStateSaved = true; 2576 } 2577 2578 if (mActive == null || mActive.size() <= 0) { 2579 return null; 2580 } 2581 2582 // First collect all active fragments. 2583 int N = mActive.size(); 2584 FragmentState[] active = new FragmentState[N]; 2585 boolean haveFragments = false; 2586 for (int i=0; i<N; i++) { 2587 Fragment f = mActive.get(i); 2588 if (f != null) { 2589 if (f.mIndex < 0) { 2590 throwException(new IllegalStateException( 2591 "Failure saving state: active " + f 2592 + " has cleared index: " + f.mIndex)); 2593 } 2594 2595 haveFragments = true; 2596 2597 FragmentState fs = new FragmentState(f); 2598 active[i] = fs; 2599 2600 if (f.mState > Fragment.INITIALIZING && fs.mSavedFragmentState == null) { 2601 fs.mSavedFragmentState = saveFragmentBasicState(f); 2602 2603 if (f.mTarget != null) { 2604 if (f.mTarget.mIndex < 0) { 2605 throwException(new IllegalStateException( 2606 "Failure saving state: " + f 2607 + " has target not in fragment manager: " + f.mTarget)); 2608 } 2609 if (fs.mSavedFragmentState == null) { 2610 fs.mSavedFragmentState = new Bundle(); 2611 } 2612 putFragment(fs.mSavedFragmentState, 2613 FragmentManagerImpl.TARGET_STATE_TAG, f.mTarget); 2614 if (f.mTargetRequestCode != 0) { 2615 fs.mSavedFragmentState.putInt( 2616 FragmentManagerImpl.TARGET_REQUEST_CODE_STATE_TAG, 2617 f.mTargetRequestCode); 2618 } 2619 } 2620 2621 } else { 2622 fs.mSavedFragmentState = f.mSavedFragmentState; 2623 } 2624 2625 if (DEBUG) Log.v(TAG, "Saved state of " + f + ": " 2626 + fs.mSavedFragmentState); 2627 } 2628 } 2629 2630 if (!haveFragments) { 2631 if (DEBUG) Log.v(TAG, "saveAllState: no fragments!"); 2632 return null; 2633 } 2634 2635 int[] added = null; 2636 BackStackState[] backStack = null; 2637 2638 // Build list of currently added fragments. 2639 if (mAdded != null) { 2640 N = mAdded.size(); 2641 if (N > 0) { 2642 added = new int[N]; 2643 for (int i=0; i<N; i++) { 2644 added[i] = mAdded.get(i).mIndex; 2645 if (added[i] < 0) { 2646 throwException(new IllegalStateException( 2647 "Failure saving state: active " + mAdded.get(i) 2648 + " has cleared index: " + added[i])); 2649 } 2650 if (DEBUG) Log.v(TAG, "saveAllState: adding fragment #" + i 2651 + ": " + mAdded.get(i)); 2652 } 2653 } 2654 } 2655 2656 // Now save back stack. 2657 if (mBackStack != null) { 2658 N = mBackStack.size(); 2659 if (N > 0) { 2660 backStack = new BackStackState[N]; 2661 for (int i=0; i<N; i++) { 2662 backStack[i] = new BackStackState(mBackStack.get(i)); 2663 if (DEBUG) Log.v(TAG, "saveAllState: adding back stack #" + i 2664 + ": " + mBackStack.get(i)); 2665 } 2666 } 2667 } 2668 2669 FragmentManagerState fms = new FragmentManagerState(); 2670 fms.mActive = active; 2671 fms.mAdded = added; 2672 fms.mBackStack = backStack; 2673 return fms; 2674 } 2675 2676 void restoreAllState(Parcelable state, FragmentManagerNonConfig nonConfig) { 2677 // If there is no saved state at all, then there can not be 2678 // any nonConfig fragments either, so that is that. 2679 if (state == null) return; 2680 FragmentManagerState fms = (FragmentManagerState)state; 2681 if (fms.mActive == null) return; 2682 2683 List<FragmentManagerNonConfig> childNonConfigs = null; 2684 2685 // First re-attach any non-config instances we are retaining back 2686 // to their saved state, so we don't try to instantiate them again. 2687 if (nonConfig != null) { 2688 List<Fragment> nonConfigFragments = nonConfig.getFragments(); 2689 childNonConfigs = nonConfig.getChildNonConfigs(); 2690 final int count = nonConfigFragments != null ? nonConfigFragments.size() : 0; 2691 for (int i = 0; i < count; i++) { 2692 Fragment f = nonConfigFragments.get(i); 2693 if (DEBUG) Log.v(TAG, "restoreAllState: re-attaching retained " + f); 2694 FragmentState fs = fms.mActive[f.mIndex]; 2695 fs.mInstance = f; 2696 f.mSavedViewState = null; 2697 f.mBackStackNesting = 0; 2698 f.mInLayout = false; 2699 f.mAdded = false; 2700 f.mTarget = null; 2701 if (fs.mSavedFragmentState != null) { 2702 fs.mSavedFragmentState.setClassLoader(mHost.getContext().getClassLoader()); 2703 f.mSavedViewState = fs.mSavedFragmentState.getSparseParcelableArray( 2704 FragmentManagerImpl.VIEW_STATE_TAG); 2705 f.mSavedFragmentState = fs.mSavedFragmentState; 2706 } 2707 } 2708 } 2709 2710 // Build the full list of active fragments, instantiating them from 2711 // their saved state. 2712 mActive = new ArrayList<>(fms.mActive.length); 2713 if (mAvailIndices != null) { 2714 mAvailIndices.clear(); 2715 } 2716 for (int i=0; i<fms.mActive.length; i++) { 2717 FragmentState fs = fms.mActive[i]; 2718 if (fs != null) { 2719 FragmentManagerNonConfig childNonConfig = null; 2720 if (childNonConfigs != null && i < childNonConfigs.size()) { 2721 childNonConfig = childNonConfigs.get(i); 2722 } 2723 Fragment f = fs.instantiate(mHost, mParent, childNonConfig); 2724 if (DEBUG) Log.v(TAG, "restoreAllState: active #" + i + ": " + f); 2725 mActive.add(f); 2726 // Now that the fragment is instantiated (or came from being 2727 // retained above), clear mInstance in case we end up re-restoring 2728 // from this FragmentState again. 2729 fs.mInstance = null; 2730 } else { 2731 mActive.add(null); 2732 if (mAvailIndices == null) { 2733 mAvailIndices = new ArrayList<Integer>(); 2734 } 2735 if (DEBUG) Log.v(TAG, "restoreAllState: avail #" + i); 2736 mAvailIndices.add(i); 2737 } 2738 } 2739 2740 // Update the target of all retained fragments. 2741 if (nonConfig != null) { 2742 List<Fragment> nonConfigFragments = nonConfig.getFragments(); 2743 final int count = nonConfigFragments != null ? nonConfigFragments.size() : 0; 2744 for (int i = 0; i < count; i++) { 2745 Fragment f = nonConfigFragments.get(i); 2746 if (f.mTargetIndex >= 0) { 2747 if (f.mTargetIndex < mActive.size()) { 2748 f.mTarget = mActive.get(f.mTargetIndex); 2749 } else { 2750 Log.w(TAG, "Re-attaching retained fragment " + f 2751 + " target no longer exists: " + f.mTargetIndex); 2752 f.mTarget = null; 2753 } 2754 } 2755 } 2756 } 2757 2758 // Build the list of currently added fragments. 2759 if (fms.mAdded != null) { 2760 mAdded = new ArrayList<Fragment>(fms.mAdded.length); 2761 for (int i=0; i<fms.mAdded.length; i++) { 2762 Fragment f = mActive.get(fms.mAdded[i]); 2763 if (f == null) { 2764 throwException(new IllegalStateException( 2765 "No instantiated fragment for index #" + fms.mAdded[i])); 2766 } 2767 f.mAdded = true; 2768 if (DEBUG) Log.v(TAG, "restoreAllState: added #" + i + ": " + f); 2769 if (mAdded.contains(f)) { 2770 throw new IllegalStateException("Already added!"); 2771 } 2772 mAdded.add(f); 2773 } 2774 } else { 2775 mAdded = null; 2776 } 2777 2778 // Build the back stack. 2779 if (fms.mBackStack != null) { 2780 mBackStack = new ArrayList<BackStackRecord>(fms.mBackStack.length); 2781 for (int i=0; i<fms.mBackStack.length; i++) { 2782 BackStackRecord bse = fms.mBackStack[i].instantiate(this); 2783 if (DEBUG) { 2784 Log.v(TAG, "restoreAllState: back stack #" + i 2785 + " (index " + bse.mIndex + "): " + bse); 2786 LogWriter logw = new LogWriter(TAG); 2787 PrintWriter pw = new PrintWriter(logw); 2788 bse.dump(" ", pw, false); 2789 } 2790 mBackStack.add(bse); 2791 if (bse.mIndex >= 0) { 2792 setBackStackIndex(bse.mIndex, bse); 2793 } 2794 } 2795 } else { 2796 mBackStack = null; 2797 } 2798 } 2799 2800 public void attachController(FragmentHostCallback host, 2801 FragmentContainer container, Fragment parent) { 2802 if (mHost != null) throw new IllegalStateException("Already attached"); 2803 mHost = host; 2804 mContainer = container; 2805 mParent = parent; 2806 } 2807 2808 public void noteStateNotSaved() { 2809 mStateSaved = false; 2810 } 2811 2812 public void dispatchCreate() { 2813 mStateSaved = false; 2814 moveToState(Fragment.CREATED); 2815 } 2816 2817 public void dispatchActivityCreated() { 2818 mStateSaved = false; 2819 moveToState(Fragment.ACTIVITY_CREATED); 2820 } 2821 2822 public void dispatchStart() { 2823 mStateSaved = false; 2824 moveToState(Fragment.STARTED); 2825 } 2826 2827 public void dispatchResume() { 2828 mStateSaved = false; 2829 moveToState(Fragment.RESUMED); 2830 } 2831 2832 public void dispatchPause() { 2833 moveToState(Fragment.STARTED); 2834 } 2835 2836 public void dispatchStop() { 2837 // See saveAllState() for the explanation of this. We do this for 2838 // all platform versions, to keep our behavior more consistent between 2839 // them. 2840 mStateSaved = true; 2841 2842 moveToState(Fragment.STOPPED); 2843 } 2844 2845 public void dispatchReallyStop() { 2846 moveToState(Fragment.ACTIVITY_CREATED); 2847 } 2848 2849 public void dispatchDestroyView() { 2850 moveToState(Fragment.CREATED); 2851 } 2852 2853 public void dispatchDestroy() { 2854 mDestroyed = true; 2855 execPendingActions(); 2856 moveToState(Fragment.INITIALIZING); 2857 mHost = null; 2858 mContainer = null; 2859 mParent = null; 2860 } 2861 2862 public void dispatchMultiWindowModeChanged(boolean isInMultiWindowMode) { 2863 if (mAdded == null) { 2864 return; 2865 } 2866 for (int i = mAdded.size() - 1; i >= 0; --i) { 2867 final android.support.v4.app.Fragment f = mAdded.get(i); 2868 if (f != null) { 2869 f.performMultiWindowModeChanged(isInMultiWindowMode); 2870 } 2871 } 2872 } 2873 2874 public void dispatchPictureInPictureModeChanged(boolean isInPictureInPictureMode) { 2875 if (mAdded == null) { 2876 return; 2877 } 2878 for (int i = mAdded.size() - 1; i >= 0; --i) { 2879 final android.support.v4.app.Fragment f = mAdded.get(i); 2880 if (f != null) { 2881 f.performPictureInPictureModeChanged(isInPictureInPictureMode); 2882 } 2883 } 2884 } 2885 2886 public void dispatchConfigurationChanged(Configuration newConfig) { 2887 if (mAdded != null) { 2888 for (int i=0; i<mAdded.size(); i++) { 2889 Fragment f = mAdded.get(i); 2890 if (f != null) { 2891 f.performConfigurationChanged(newConfig); 2892 } 2893 } 2894 } 2895 } 2896 2897 public void dispatchLowMemory() { 2898 if (mAdded != null) { 2899 for (int i=0; i<mAdded.size(); i++) { 2900 Fragment f = mAdded.get(i); 2901 if (f != null) { 2902 f.performLowMemory(); 2903 } 2904 } 2905 } 2906 } 2907 2908 public boolean dispatchCreateOptionsMenu(Menu menu, MenuInflater inflater) { 2909 boolean show = false; 2910 ArrayList<Fragment> newMenus = null; 2911 if (mAdded != null) { 2912 for (int i=0; i<mAdded.size(); i++) { 2913 Fragment f = mAdded.get(i); 2914 if (f != null) { 2915 if (f.performCreateOptionsMenu(menu, inflater)) { 2916 show = true; 2917 if (newMenus == null) { 2918 newMenus = new ArrayList<Fragment>(); 2919 } 2920 newMenus.add(f); 2921 } 2922 } 2923 } 2924 } 2925 2926 if (mCreatedMenus != null) { 2927 for (int i=0; i<mCreatedMenus.size(); i++) { 2928 Fragment f = mCreatedMenus.get(i); 2929 if (newMenus == null || !newMenus.contains(f)) { 2930 f.onDestroyOptionsMenu(); 2931 } 2932 } 2933 } 2934 2935 mCreatedMenus = newMenus; 2936 2937 return show; 2938 } 2939 2940 public boolean dispatchPrepareOptionsMenu(Menu menu) { 2941 boolean show = false; 2942 if (mAdded != null) { 2943 for (int i=0; i<mAdded.size(); i++) { 2944 Fragment f = mAdded.get(i); 2945 if (f != null) { 2946 if (f.performPrepareOptionsMenu(menu)) { 2947 show = true; 2948 } 2949 } 2950 } 2951 } 2952 return show; 2953 } 2954 2955 public boolean dispatchOptionsItemSelected(MenuItem item) { 2956 if (mAdded != null) { 2957 for (int i=0; i<mAdded.size(); i++) { 2958 Fragment f = mAdded.get(i); 2959 if (f != null) { 2960 if (f.performOptionsItemSelected(item)) { 2961 return true; 2962 } 2963 } 2964 } 2965 } 2966 return false; 2967 } 2968 2969 public boolean dispatchContextItemSelected(MenuItem item) { 2970 if (mAdded != null) { 2971 for (int i=0; i<mAdded.size(); i++) { 2972 Fragment f = mAdded.get(i); 2973 if (f != null) { 2974 if (f.performContextItemSelected(item)) { 2975 return true; 2976 } 2977 } 2978 } 2979 } 2980 return false; 2981 } 2982 2983 public void dispatchOptionsMenuClosed(Menu menu) { 2984 if (mAdded != null) { 2985 for (int i=0; i<mAdded.size(); i++) { 2986 Fragment f = mAdded.get(i); 2987 if (f != null) { 2988 f.performOptionsMenuClosed(menu); 2989 } 2990 } 2991 } 2992 } 2993 2994 public void registerFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb, 2995 boolean recursive) { 2996 if (mLifecycleCallbacks == null) { 2997 mLifecycleCallbacks = new CopyOnWriteArrayList<>(); 2998 } 2999 mLifecycleCallbacks.add(new Pair(cb, recursive)); 3000 } 3001 3002 public void unregisterFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb) { 3003 if (mLifecycleCallbacks == null) { 3004 return; 3005 } 3006 3007 synchronized (mLifecycleCallbacks) { 3008 for (int i = 0, N = mLifecycleCallbacks.size(); i < N; i++) { 3009 if (mLifecycleCallbacks.get(i).first == cb) { 3010 mLifecycleCallbacks.remove(i); 3011 break; 3012 } 3013 } 3014 } 3015 } 3016 3017 void dispatchOnFragmentPreAttached(Fragment f, Context context, boolean onlyRecursive) { 3018 if (mParent != null) { 3019 FragmentManager parentManager = mParent.getFragmentManager(); 3020 if (parentManager instanceof FragmentManagerImpl) { 3021 ((FragmentManagerImpl) parentManager) 3022 .dispatchOnFragmentPreAttached(f, context, true); 3023 } 3024 } 3025 if (mLifecycleCallbacks == null) { 3026 return; 3027 } 3028 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3029 if (!onlyRecursive || p.second) { 3030 p.first.onFragmentPreAttached(this, f, context); 3031 } 3032 } 3033 } 3034 3035 void dispatchOnFragmentAttached(Fragment f, Context context, boolean onlyRecursive) { 3036 if (mParent != null) { 3037 FragmentManager parentManager = mParent.getFragmentManager(); 3038 if (parentManager instanceof FragmentManagerImpl) { 3039 ((FragmentManagerImpl) parentManager) 3040 .dispatchOnFragmentAttached(f, context, true); 3041 } 3042 } 3043 if (mLifecycleCallbacks == null) { 3044 return; 3045 } 3046 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3047 if (!onlyRecursive || p.second) { 3048 p.first.onFragmentAttached(this, f, context); 3049 } 3050 } 3051 } 3052 3053 void dispatchOnFragmentCreated(Fragment f, Bundle savedInstanceState, boolean onlyRecursive) { 3054 if (mParent != null) { 3055 FragmentManager parentManager = mParent.getFragmentManager(); 3056 if (parentManager instanceof FragmentManagerImpl) { 3057 ((FragmentManagerImpl) parentManager) 3058 .dispatchOnFragmentCreated(f, savedInstanceState, true); 3059 } 3060 } 3061 if (mLifecycleCallbacks == null) { 3062 return; 3063 } 3064 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3065 if (!onlyRecursive || p.second) { 3066 p.first.onFragmentCreated(this, f, savedInstanceState); 3067 } 3068 } 3069 } 3070 3071 void dispatchOnFragmentActivityCreated(Fragment f, Bundle savedInstanceState, 3072 boolean onlyRecursive) { 3073 if (mParent != null) { 3074 FragmentManager parentManager = mParent.getFragmentManager(); 3075 if (parentManager instanceof FragmentManagerImpl) { 3076 ((FragmentManagerImpl) parentManager) 3077 .dispatchOnFragmentActivityCreated(f, savedInstanceState, true); 3078 } 3079 } 3080 if (mLifecycleCallbacks == null) { 3081 return; 3082 } 3083 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3084 if (!onlyRecursive || p.second) { 3085 p.first.onFragmentActivityCreated(this, f, savedInstanceState); 3086 } 3087 } 3088 } 3089 3090 void dispatchOnFragmentViewCreated(Fragment f, View v, Bundle savedInstanceState, 3091 boolean onlyRecursive) { 3092 if (mParent != null) { 3093 FragmentManager parentManager = mParent.getFragmentManager(); 3094 if (parentManager instanceof FragmentManagerImpl) { 3095 ((FragmentManagerImpl) parentManager) 3096 .dispatchOnFragmentViewCreated(f, v, savedInstanceState, true); 3097 } 3098 } 3099 if (mLifecycleCallbacks == null) { 3100 return; 3101 } 3102 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3103 if (!onlyRecursive || p.second) { 3104 p.first.onFragmentViewCreated(this, f, v, savedInstanceState); 3105 } 3106 } 3107 } 3108 3109 void dispatchOnFragmentStarted(Fragment f, boolean onlyRecursive) { 3110 if (mParent != null) { 3111 FragmentManager parentManager = mParent.getFragmentManager(); 3112 if (parentManager instanceof FragmentManagerImpl) { 3113 ((FragmentManagerImpl) parentManager) 3114 .dispatchOnFragmentStarted(f, true); 3115 } 3116 } 3117 if (mLifecycleCallbacks == null) { 3118 return; 3119 } 3120 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3121 if (!onlyRecursive || p.second) { 3122 p.first.onFragmentStarted(this, f); 3123 } 3124 } 3125 } 3126 3127 void dispatchOnFragmentResumed(Fragment f, boolean onlyRecursive) { 3128 if (mParent != null) { 3129 FragmentManager parentManager = mParent.getFragmentManager(); 3130 if (parentManager instanceof FragmentManagerImpl) { 3131 ((FragmentManagerImpl) parentManager) 3132 .dispatchOnFragmentResumed(f, true); 3133 } 3134 } 3135 if (mLifecycleCallbacks == null) { 3136 return; 3137 } 3138 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3139 if (!onlyRecursive || p.second) { 3140 p.first.onFragmentResumed(this, f); 3141 } 3142 } 3143 } 3144 3145 void dispatchOnFragmentPaused(Fragment f, boolean onlyRecursive) { 3146 if (mParent != null) { 3147 FragmentManager parentManager = mParent.getFragmentManager(); 3148 if (parentManager instanceof FragmentManagerImpl) { 3149 ((FragmentManagerImpl) parentManager) 3150 .dispatchOnFragmentPaused(f, true); 3151 } 3152 } 3153 if (mLifecycleCallbacks == null) { 3154 return; 3155 } 3156 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3157 if (!onlyRecursive || p.second) { 3158 p.first.onFragmentPaused(this, f); 3159 } 3160 } 3161 } 3162 3163 void dispatchOnFragmentStopped(Fragment f, boolean onlyRecursive) { 3164 if (mParent != null) { 3165 FragmentManager parentManager = mParent.getFragmentManager(); 3166 if (parentManager instanceof FragmentManagerImpl) { 3167 ((FragmentManagerImpl) parentManager) 3168 .dispatchOnFragmentStopped(f, true); 3169 } 3170 } 3171 if (mLifecycleCallbacks == null) { 3172 return; 3173 } 3174 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3175 if (!onlyRecursive || p.second) { 3176 p.first.onFragmentStopped(this, f); 3177 } 3178 } 3179 } 3180 3181 void dispatchOnFragmentSaveInstanceState(Fragment f, Bundle outState, boolean onlyRecursive) { 3182 if (mParent != null) { 3183 FragmentManager parentManager = mParent.getFragmentManager(); 3184 if (parentManager instanceof FragmentManagerImpl) { 3185 ((FragmentManagerImpl) parentManager) 3186 .dispatchOnFragmentSaveInstanceState(f, outState, true); 3187 } 3188 } 3189 if (mLifecycleCallbacks == null) { 3190 return; 3191 } 3192 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3193 if (!onlyRecursive || p.second) { 3194 p.first.onFragmentSaveInstanceState(this, f, outState); 3195 } 3196 } 3197 } 3198 3199 void dispatchOnFragmentViewDestroyed(Fragment f, boolean onlyRecursive) { 3200 if (mParent != null) { 3201 FragmentManager parentManager = mParent.getFragmentManager(); 3202 if (parentManager instanceof FragmentManagerImpl) { 3203 ((FragmentManagerImpl) parentManager) 3204 .dispatchOnFragmentViewDestroyed(f, true); 3205 } 3206 } 3207 if (mLifecycleCallbacks == null) { 3208 return; 3209 } 3210 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3211 if (!onlyRecursive || p.second) { 3212 p.first.onFragmentViewDestroyed(this, f); 3213 } 3214 } 3215 } 3216 3217 void dispatchOnFragmentDestroyed(Fragment f, boolean onlyRecursive) { 3218 if (mParent != null) { 3219 FragmentManager parentManager = mParent.getFragmentManager(); 3220 if (parentManager instanceof FragmentManagerImpl) { 3221 ((FragmentManagerImpl) parentManager) 3222 .dispatchOnFragmentDestroyed(f, true); 3223 } 3224 } 3225 if (mLifecycleCallbacks == null) { 3226 return; 3227 } 3228 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3229 if (!onlyRecursive || p.second) { 3230 p.first.onFragmentDestroyed(this, f); 3231 } 3232 } 3233 } 3234 3235 void dispatchOnFragmentDetached(Fragment f, boolean onlyRecursive) { 3236 if (mParent != null) { 3237 FragmentManager parentManager = mParent.getFragmentManager(); 3238 if (parentManager instanceof FragmentManagerImpl) { 3239 ((FragmentManagerImpl) parentManager) 3240 .dispatchOnFragmentDetached(f, true); 3241 } 3242 } 3243 if (mLifecycleCallbacks == null) { 3244 return; 3245 } 3246 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3247 if (!onlyRecursive || p.second) { 3248 p.first.onFragmentDetached(this, f); 3249 } 3250 } 3251 } 3252 3253 public static int reverseTransit(int transit) { 3254 int rev = 0; 3255 switch (transit) { 3256 case FragmentTransaction.TRANSIT_FRAGMENT_OPEN: 3257 rev = FragmentTransaction.TRANSIT_FRAGMENT_CLOSE; 3258 break; 3259 case FragmentTransaction.TRANSIT_FRAGMENT_CLOSE: 3260 rev = FragmentTransaction.TRANSIT_FRAGMENT_OPEN; 3261 break; 3262 case FragmentTransaction.TRANSIT_FRAGMENT_FADE: 3263 rev = FragmentTransaction.TRANSIT_FRAGMENT_FADE; 3264 break; 3265 } 3266 return rev; 3267 3268 } 3269 3270 public static final int ANIM_STYLE_OPEN_ENTER = 1; 3271 public static final int ANIM_STYLE_OPEN_EXIT = 2; 3272 public static final int ANIM_STYLE_CLOSE_ENTER = 3; 3273 public static final int ANIM_STYLE_CLOSE_EXIT = 4; 3274 public static final int ANIM_STYLE_FADE_ENTER = 5; 3275 public static final int ANIM_STYLE_FADE_EXIT = 6; 3276 3277 public static int transitToStyleIndex(int transit, boolean enter) { 3278 int animAttr = -1; 3279 switch (transit) { 3280 case FragmentTransaction.TRANSIT_FRAGMENT_OPEN: 3281 animAttr = enter ? ANIM_STYLE_OPEN_ENTER : ANIM_STYLE_OPEN_EXIT; 3282 break; 3283 case FragmentTransaction.TRANSIT_FRAGMENT_CLOSE: 3284 animAttr = enter ? ANIM_STYLE_CLOSE_ENTER : ANIM_STYLE_CLOSE_EXIT; 3285 break; 3286 case FragmentTransaction.TRANSIT_FRAGMENT_FADE: 3287 animAttr = enter ? ANIM_STYLE_FADE_ENTER : ANIM_STYLE_FADE_EXIT; 3288 break; 3289 } 3290 return animAttr; 3291 } 3292 3293 @Override 3294 public View onCreateView(View parent, String name, Context context, AttributeSet attrs) { 3295 if (!"fragment".equals(name)) { 3296 return null; 3297 } 3298 3299 String fname = attrs.getAttributeValue(null, "class"); 3300 TypedArray a = context.obtainStyledAttributes(attrs, FragmentTag.Fragment); 3301 if (fname == null) { 3302 fname = a.getString(FragmentTag.Fragment_name); 3303 } 3304 int id = a.getResourceId(FragmentTag.Fragment_id, View.NO_ID); 3305 String tag = a.getString(FragmentTag.Fragment_tag); 3306 a.recycle(); 3307 3308 if (!Fragment.isSupportFragmentClass(mHost.getContext(), fname)) { 3309 // Invalid support lib fragment; let the device's framework handle it. 3310 // This will allow android.app.Fragments to do the right thing. 3311 return null; 3312 } 3313 3314 int containerId = parent != null ? parent.getId() : 0; 3315 if (containerId == View.NO_ID && id == View.NO_ID && tag == null) { 3316 throw new IllegalArgumentException(attrs.getPositionDescription() 3317 + ": Must specify unique android:id, android:tag, or have a parent with an id for " + fname); 3318 } 3319 3320 // If we restored from a previous state, we may already have 3321 // instantiated this fragment from the state and should use 3322 // that instance instead of making a new one. 3323 Fragment fragment = id != View.NO_ID ? findFragmentById(id) : null; 3324 if (fragment == null && tag != null) { 3325 fragment = findFragmentByTag(tag); 3326 } 3327 if (fragment == null && containerId != View.NO_ID) { 3328 fragment = findFragmentById(containerId); 3329 } 3330 3331 if (FragmentManagerImpl.DEBUG) Log.v(TAG, "onCreateView: id=0x" 3332 + Integer.toHexString(id) + " fname=" + fname 3333 + " existing=" + fragment); 3334 if (fragment == null) { 3335 fragment = Fragment.instantiate(context, fname); 3336 fragment.mFromLayout = true; 3337 fragment.mFragmentId = id != 0 ? id : containerId; 3338 fragment.mContainerId = containerId; 3339 fragment.mTag = tag; 3340 fragment.mInLayout = true; 3341 fragment.mFragmentManager = this; 3342 fragment.mHost = mHost; 3343 fragment.onInflate(mHost.getContext(), attrs, fragment.mSavedFragmentState); 3344 addFragment(fragment, true); 3345 3346 } else if (fragment.mInLayout) { 3347 // A fragment already exists and it is not one we restored from 3348 // previous state. 3349 throw new IllegalArgumentException(attrs.getPositionDescription() 3350 + ": Duplicate id 0x" + Integer.toHexString(id) 3351 + ", tag " + tag + ", or parent id 0x" + Integer.toHexString(containerId) 3352 + " with another fragment for " + fname); 3353 } else { 3354 // This fragment was retained from a previous instance; get it 3355 // going now. 3356 fragment.mInLayout = true; 3357 fragment.mHost = mHost; 3358 // If this fragment is newly instantiated (either right now, or 3359 // from last saved state), then give it the attributes to 3360 // initialize itself. 3361 if (!fragment.mRetaining) { 3362 fragment.onInflate(mHost.getContext(), attrs, fragment.mSavedFragmentState); 3363 } 3364 } 3365 3366 // If we haven't finished entering the CREATED state ourselves yet, 3367 // push the inflated child fragment along. 3368 if (mCurState < Fragment.CREATED && fragment.mFromLayout) { 3369 moveToState(fragment, Fragment.CREATED, 0, 0, false); 3370 } else { 3371 moveToState(fragment); 3372 } 3373 3374 if (fragment.mView == null) { 3375 throw new IllegalStateException("Fragment " + fname 3376 + " did not create a view."); 3377 } 3378 if (id != 0) { 3379 fragment.mView.setId(id); 3380 } 3381 if (fragment.mView.getTag() == null) { 3382 fragment.mView.setTag(tag); 3383 } 3384 return fragment.mView; 3385 } 3386 3387 LayoutInflaterFactory getLayoutInflaterFactory() { 3388 return this; 3389 } 3390 3391 static class FragmentTag { 3392 public static final int[] Fragment = { 3393 0x01010003, 0x010100d0, 0x010100d1 3394 }; 3395 public static final int Fragment_id = 1; 3396 public static final int Fragment_name = 0; 3397 public static final int Fragment_tag = 2; 3398 } 3399 3400 /** 3401 * An add or pop transaction to be scheduled for the UI thread. 3402 */ 3403 interface OpGenerator { 3404 /** 3405 * Generate transactions to add to {@code records} and whether or not the transaction is 3406 * an add or pop to {@code isRecordPop}. 3407 * 3408 * records and isRecordPop must be added equally so that each transaction in records 3409 * matches the boolean for whether or not it is a pop in isRecordPop. 3410 * 3411 * @param records A list to add transactions to. 3412 * @param isRecordPop A list to add whether or not the transactions added to records is 3413 * a pop transaction. 3414 * @return true if something was added or false otherwise. 3415 */ 3416 boolean generateOps(ArrayList<BackStackRecord> records, ArrayList<Boolean> isRecordPop); 3417 } 3418 3419 /** 3420 * A pop operation OpGenerator. This will be run on the UI thread and will generate the 3421 * transactions that will be popped if anything can be popped. 3422 */ 3423 private class PopBackStackState implements OpGenerator { 3424 final String mName; 3425 final int mId; 3426 final int mFlags; 3427 3428 PopBackStackState(String name, int id, int flags) { 3429 mName = name; 3430 mId = id; 3431 mFlags = flags; 3432 } 3433 3434 @Override 3435 public boolean generateOps(ArrayList<BackStackRecord> records, 3436 ArrayList<Boolean> isRecordPop) { 3437 return popBackStackState(records, isRecordPop, mName, mId, mFlags); 3438 } 3439 } 3440 3441 /** 3442 * A listener for a postponed transaction. This waits until 3443 * {@link Fragment#startPostponedEnterTransition()} is called or a transaction is started 3444 * that interacts with this one, based on interactions with the fragment container. 3445 */ 3446 static class StartEnterTransitionListener 3447 implements Fragment.OnStartEnterTransitionListener { 3448 private final boolean mIsBack; 3449 private final BackStackRecord mRecord; 3450 private int mNumPostponed; 3451 3452 StartEnterTransitionListener(BackStackRecord record, boolean isBack) { 3453 mIsBack = isBack; 3454 mRecord = record; 3455 } 3456 3457 /** 3458 * Called from {@link Fragment#startPostponedEnterTransition()}, this decreases the 3459 * number of Fragments that are postponed. This may cause the transaction to schedule 3460 * to finish running and run transitions and animations. 3461 */ 3462 @Override 3463 public void onStartEnterTransition() { 3464 mNumPostponed--; 3465 if (mNumPostponed != 0) { 3466 return; 3467 } 3468 mRecord.mManager.scheduleCommit(); 3469 } 3470 3471 /** 3472 * Called from {@link Fragment# 3473 * setOnStartEnterTransitionListener(Fragment.OnStartEnterTransitionListener)}, this 3474 * increases the number of fragments that are postponed as part of this transaction. 3475 */ 3476 @Override 3477 public void startListening() { 3478 mNumPostponed++; 3479 } 3480 3481 /** 3482 * @return true if there are no more postponed fragments as part of the transaction. 3483 */ 3484 public boolean isReady() { 3485 return mNumPostponed == 0; 3486 } 3487 3488 /** 3489 * Completes the transaction and start the animations and transitions. This may skip 3490 * the transitions if this is called before all fragments have called 3491 * {@link Fragment#startPostponedEnterTransition()}. 3492 */ 3493 public void completeTransaction() { 3494 final boolean canceled; 3495 canceled = mNumPostponed > 0; 3496 FragmentManagerImpl manager = mRecord.mManager; 3497 final int numAdded = manager.mAdded.size(); 3498 for (int i = 0; i < numAdded; i++) { 3499 final Fragment fragment = manager.mAdded.get(i); 3500 fragment.setOnStartEnterTransitionListener(null); 3501 if (canceled && fragment.isPostponed()) { 3502 fragment.startPostponedEnterTransition(); 3503 } 3504 } 3505 mRecord.mManager.completeExecute(mRecord, mIsBack, !canceled, true); 3506 } 3507 3508 /** 3509 * Cancels this transaction instead of completing it. That means that the state isn't 3510 * changed, so the pop results in no change to the state. 3511 */ 3512 public void cancelTransaction() { 3513 mRecord.mManager.completeExecute(mRecord, mIsBack, false, false); 3514 } 3515 } 3516} 3517