1/* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.app; 18 19import android.animation.Animator; 20import android.animation.AnimatorInflater; 21import android.animation.AnimatorListenerAdapter; 22import android.animation.AnimatorSet; 23import android.animation.PropertyValuesHolder; 24import android.animation.ValueAnimator; 25import android.content.Context; 26import android.content.pm.ApplicationInfo; 27import android.content.res.Configuration; 28import android.content.res.Resources.NotFoundException; 29import android.content.res.TypedArray; 30import android.os.Build; 31import android.os.Bundle; 32import android.os.Debug; 33import android.os.Looper; 34import android.os.Parcel; 35import android.os.Parcelable; 36import android.util.ArraySet; 37import android.util.AttributeSet; 38import android.util.DebugUtils; 39import android.util.Log; 40import android.util.LogWriter; 41import android.util.Pair; 42import android.util.SparseArray; 43import android.util.SuperNotCalledException; 44import android.view.LayoutInflater; 45import android.view.Menu; 46import android.view.MenuInflater; 47import android.view.MenuItem; 48import android.view.View; 49import android.view.ViewGroup; 50 51import com.android.internal.util.FastPrintWriter; 52 53import java.io.FileDescriptor; 54import java.io.PrintWriter; 55import java.util.ArrayList; 56import java.util.Arrays; 57import java.util.Collections; 58import java.util.List; 59import java.util.concurrent.CopyOnWriteArrayList; 60 61/** 62 * Interface for interacting with {@link Fragment} objects inside of an 63 * {@link Activity} 64 * 65 * <div class="special reference"> 66 * <h3>Developer Guides</h3> 67 * <p>For more information about using fragments, read the 68 * <a href="{@docRoot}guide/components/fragments.html">Fragments</a> developer guide.</p> 69 * </div> 70 * 71 * While the FragmentManager API was introduced in 72 * {@link android.os.Build.VERSION_CODES#HONEYCOMB}, a version of the API 73 * at is also available for use on older platforms through 74 * {@link android.support.v4.app.FragmentActivity}. See the blog post 75 * <a href="http://android-developers.blogspot.com/2011/03/fragments-for-all.html"> 76 * Fragments For All</a> for more details. 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 public int getBreadCrumbTitleRes(); 110 111 /** 112 * Return the short bread crumb title resource identifier for the entry, 113 * or 0 if it does not have one. 114 */ 115 public int getBreadCrumbShortTitleRes(); 116 117 /** 118 * Return the full bread crumb title for the entry, or null if it 119 * does not have one. 120 */ 121 public CharSequence getBreadCrumbTitle(); 122 123 /** 124 * Return the short bread crumb title for the entry, or null if it 125 * does not have one. 126 */ 127 public CharSequence getBreadCrumbShortTitle(); 128 } 129 130 /** 131 * Interface to watch for changes to the back stack. 132 */ 133 public interface OnBackStackChangedListener { 134 /** 135 * Called whenever the contents of the back stack change. 136 */ 137 public void onBackStackChanged(); 138 } 139 140 /** 141 * Start a series of edit operations on the Fragments associated with 142 * this FragmentManager. 143 * 144 * <p>Note: A fragment transaction can only be created/committed prior 145 * to an activity saving its state. If you try to commit a transaction 146 * after {@link Activity#onSaveInstanceState Activity.onSaveInstanceState()} 147 * (and prior to a following {@link Activity#onStart Activity.onStart} 148 * or {@link Activity#onResume Activity.onResume()}, you will get an error. 149 * This is because the framework takes care of saving your current fragments 150 * in the state, and if changes are made after the state is saved then they 151 * will be lost.</p> 152 */ 153 public abstract FragmentTransaction beginTransaction(); 154 155 /** @hide -- remove once prebuilts are in. */ 156 @Deprecated 157 public FragmentTransaction openTransaction() { 158 return beginTransaction(); 159 } 160 161 /** 162 * After a {@link FragmentTransaction} is committed with 163 * {@link FragmentTransaction#commit FragmentTransaction.commit()}, it 164 * is scheduled to be executed asynchronously on the process's main thread. 165 * If you want to immediately executing any such pending operations, you 166 * can call this function (only from the main thread) to do so. Note that 167 * all callbacks and other related behavior will be done from within this 168 * call, so be careful about where this is called from. 169 * <p> 170 * This also forces the start of any postponed Transactions where 171 * {@link Fragment#postponeEnterTransition()} has been called. 172 * 173 * @return Returns true if there were any pending transactions to be 174 * executed. 175 */ 176 public abstract boolean executePendingTransactions(); 177 178 /** 179 * Finds a fragment that was identified by the given id either when inflated 180 * from XML or as the container ID when added in a transaction. This first 181 * searches through fragments that are currently added to the manager's 182 * activity; if no such fragment is found, then all fragments currently 183 * on the back stack associated with this ID are searched. 184 * @return The fragment if found or null otherwise. 185 */ 186 public abstract Fragment findFragmentById(int id); 187 188 /** 189 * Finds a fragment that was identified by the given tag either when inflated 190 * from XML or as supplied when added in a transaction. This first 191 * searches through fragments that are currently added to the manager's 192 * activity; if no such fragment is found, then all fragments currently 193 * on the back stack are searched. 194 * @return The fragment if found or null otherwise. 195 */ 196 public abstract Fragment findFragmentByTag(String tag); 197 198 /** 199 * Flag for {@link #popBackStack(String, int)} 200 * and {@link #popBackStack(int, int)}: If set, and the name or ID of 201 * a back stack entry has been supplied, then all matching entries will 202 * be consumed until one that doesn't match is found or the bottom of 203 * the stack is reached. Otherwise, all entries up to but not including that entry 204 * will be removed. 205 */ 206 public static final int POP_BACK_STACK_INCLUSIVE = 1<<0; 207 208 /** 209 * Pop the top state off the back stack. This function is asynchronous -- it 210 * enqueues the request to pop, but the action will not be performed until the 211 * application returns to its event loop. 212 */ 213 public abstract void popBackStack(); 214 215 /** 216 * Like {@link #popBackStack()}, but performs the operation immediately 217 * inside of the call. This is like calling {@link #executePendingTransactions()} 218 * afterwards without forcing the start of postponed Transactions. 219 * @return Returns true if there was something popped, else false. 220 */ 221 public abstract boolean popBackStackImmediate(); 222 223 /** 224 * Pop the last fragment transition from the manager's fragment 225 * back stack. If there is nothing to pop, false is returned. 226 * This function is asynchronous -- it enqueues the 227 * request to pop, but the action will not be performed until the application 228 * returns to its event loop. 229 * 230 * @param name If non-null, this is the name of a previous back state 231 * to look for; if found, all states up to that state will be popped. The 232 * {@link #POP_BACK_STACK_INCLUSIVE} flag can be used to control whether 233 * the named state itself is popped. If null, only the top state is popped. 234 * @param flags Either 0 or {@link #POP_BACK_STACK_INCLUSIVE}. 235 */ 236 public abstract void popBackStack(String name, int flags); 237 238 /** 239 * Like {@link #popBackStack(String, int)}, but performs the operation immediately 240 * inside of the call. This is like calling {@link #executePendingTransactions()} 241 * afterwards without forcing the start of postponed Transactions. 242 * @return Returns true if there was something popped, else false. 243 */ 244 public abstract boolean popBackStackImmediate(String name, int flags); 245 246 /** 247 * Pop all back stack states up to the one with the given identifier. 248 * This function is asynchronous -- it enqueues the 249 * request to pop, but the action will not be performed until the application 250 * returns to its event loop. 251 * 252 * @param id Identifier of the stated to be popped. If no identifier exists, 253 * false is returned. 254 * The identifier is the number returned by 255 * {@link FragmentTransaction#commit() FragmentTransaction.commit()}. The 256 * {@link #POP_BACK_STACK_INCLUSIVE} flag can be used to control whether 257 * the named state itself is popped. 258 * @param flags Either 0 or {@link #POP_BACK_STACK_INCLUSIVE}. 259 */ 260 public abstract void popBackStack(int id, int flags); 261 262 /** 263 * Like {@link #popBackStack(int, int)}, but performs the operation immediately 264 * inside of the call. This is like calling {@link #executePendingTransactions()} 265 * afterwards without forcing the start of postponed Transactions. 266 * @return Returns true if there was something popped, else false. 267 */ 268 public abstract boolean popBackStackImmediate(int id, int flags); 269 270 /** 271 * Return the number of entries currently in the back stack. 272 */ 273 public abstract int getBackStackEntryCount(); 274 275 /** 276 * Return the BackStackEntry at index <var>index</var> in the back stack; 277 * where the item on the bottom of the stack has index 0. 278 */ 279 public abstract BackStackEntry getBackStackEntryAt(int index); 280 281 /** 282 * Add a new listener for changes to the fragment back stack. 283 */ 284 public abstract void addOnBackStackChangedListener(OnBackStackChangedListener listener); 285 286 /** 287 * Remove a listener that was previously added with 288 * {@link #addOnBackStackChangedListener(OnBackStackChangedListener)}. 289 */ 290 public abstract void removeOnBackStackChangedListener(OnBackStackChangedListener listener); 291 292 /** 293 * Put a reference to a fragment in a Bundle. This Bundle can be 294 * persisted as saved state, and when later restoring 295 * {@link #getFragment(Bundle, String)} will return the current 296 * instance of the same fragment. 297 * 298 * @param bundle The bundle in which to put the fragment reference. 299 * @param key The name of the entry in the bundle. 300 * @param fragment The Fragment whose reference is to be stored. 301 */ 302 public abstract void putFragment(Bundle bundle, String key, Fragment fragment); 303 304 /** 305 * Retrieve the current Fragment instance for a reference previously 306 * placed with {@link #putFragment(Bundle, String, Fragment)}. 307 * 308 * @param bundle The bundle from which to retrieve the fragment reference. 309 * @param key The name of the entry in the bundle. 310 * @return Returns the current Fragment instance that is associated with 311 * the given reference. 312 */ 313 public abstract Fragment getFragment(Bundle bundle, String key); 314 315 /** 316 * Get a list of all fragments that are currently added to the FragmentManager. 317 * This may include those that are hidden as well as those that are shown. 318 * This will not include any fragments only in the back stack, or fragments that 319 * are detached or removed. 320 * <p> 321 * The order of the fragments in the list is the order in which they were 322 * added or attached. 323 * 324 * @return A list of all fragments that are added to the FragmentManager. 325 */ 326 public abstract List<Fragment> getFragments(); 327 328 /** 329 * Save the current instance state of the given Fragment. This can be 330 * used later when creating a new instance of the Fragment and adding 331 * it to the fragment manager, to have it create itself to match the 332 * current state returned here. Note that there are limits on how 333 * this can be used: 334 * 335 * <ul> 336 * <li>The Fragment must currently be attached to the FragmentManager. 337 * <li>A new Fragment created using this saved state must be the same class 338 * type as the Fragment it was created from. 339 * <li>The saved state can not contain dependencies on other fragments -- 340 * that is it can't use {@link #putFragment(Bundle, String, Fragment)} to 341 * store a fragment reference because that reference may not be valid when 342 * this saved state is later used. Likewise the Fragment's target and 343 * result code are not included in this state. 344 * </ul> 345 * 346 * @param f The Fragment whose state is to be saved. 347 * @return The generated state. This will be null if there was no 348 * interesting state created by the fragment. 349 */ 350 public abstract Fragment.SavedState saveFragmentInstanceState(Fragment f); 351 352 /** 353 * Returns true if the final {@link Activity#onDestroy() Activity.onDestroy()} 354 * call has been made on the FragmentManager's Activity, so this instance is now dead. 355 */ 356 public abstract boolean isDestroyed(); 357 358 /** 359 * Registers a {@link FragmentLifecycleCallbacks} to listen to fragment lifecycle events 360 * happening in this FragmentManager. All registered callbacks will be automatically 361 * unregistered when this FragmentManager is destroyed. 362 * 363 * @param cb Callbacks to register 364 * @param recursive true to automatically register this callback for all child FragmentManagers 365 */ 366 public abstract void registerFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb, 367 boolean recursive); 368 369 /** 370 * Unregisters a previously registered {@link FragmentLifecycleCallbacks}. If the callback 371 * was not previously registered this call has no effect. All registered callbacks will be 372 * automatically unregistered when this FragmentManager is destroyed. 373 * 374 * @param cb Callbacks to unregister 375 */ 376 public abstract void unregisterFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb); 377 378 /** 379 * Return the currently active primary navigation fragment for this FragmentManager. 380 * 381 * <p>The primary navigation fragment's 382 * {@link Fragment#getChildFragmentManager() child FragmentManager} will be called first 383 * to process delegated navigation actions such as {@link #popBackStack()} if no ID 384 * or transaction name is provided to pop to.</p> 385 * 386 * @return the fragment designated as the primary navigation fragment 387 */ 388 public abstract Fragment getPrimaryNavigationFragment(); 389 390 /** 391 * Print the FragmentManager's state into the given stream. 392 * 393 * @param prefix Text to print at the front of each line. 394 * @param fd The raw file descriptor that the dump is being sent to. 395 * @param writer A PrintWriter to which the dump is to be set. 396 * @param args Additional arguments to the dump request. 397 */ 398 public abstract void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args); 399 400 /** 401 * Control whether the framework's internal fragment manager debugging 402 * logs are turned on. If enabled, you will see output in logcat as 403 * the framework performs fragment operations. 404 */ 405 public static void enableDebugLogging(boolean enabled) { 406 FragmentManagerImpl.DEBUG = enabled; 407 } 408 409 /** 410 * Invalidate the attached activity's options menu as necessary. 411 * This may end up being deferred until we move to the resumed state. 412 */ 413 public void invalidateOptionsMenu() { } 414 415 /** 416 * Returns {@code true} if the FragmentManager's state has already been saved 417 * by its host. Any operations that would change saved state should not be performed 418 * if this method returns true. For example, any popBackStack() method, such as 419 * {@link #popBackStackImmediate()} or any FragmentTransaction using 420 * {@link FragmentTransaction#commit()} instead of 421 * {@link FragmentTransaction#commitAllowingStateLoss()} will change 422 * the state and will result in an error. 423 * 424 * @return true if this FragmentManager's state has already been saved by its host 425 */ 426 public abstract boolean isStateSaved(); 427 428 /** 429 * Callback interface for listening to fragment state changes that happen 430 * within a given FragmentManager. 431 */ 432 public abstract static class FragmentLifecycleCallbacks { 433 /** 434 * Called right before the fragment's {@link Fragment#onAttach(Context)} method is called. 435 * This is a good time to inject any required dependencies for the fragment before any of 436 * the fragment's lifecycle methods are invoked. 437 * 438 * @param fm Host FragmentManager 439 * @param f Fragment changing state 440 * @param context Context that the Fragment is being attached to 441 */ 442 public void onFragmentPreAttached(FragmentManager fm, Fragment f, Context context) {} 443 444 /** 445 * Called after the fragment has been attached to its host. Its host will have had 446 * <code>onAttachFragment</code> called before this call happens. 447 * 448 * @param fm Host FragmentManager 449 * @param f Fragment changing state 450 * @param context Context that the Fragment was attached to 451 */ 452 public void onFragmentAttached(FragmentManager fm, Fragment f, Context context) {} 453 454 /** 455 * Called right before the fragment's {@link Fragment#onCreate(Bundle)} method is called. 456 * This is a good time to inject any required dependencies or perform other configuration 457 * for the fragment. 458 * 459 * @param fm Host FragmentManager 460 * @param f Fragment changing state 461 * @param savedInstanceState Saved instance bundle from a previous instance 462 */ 463 public void onFragmentPreCreated(FragmentManager fm, Fragment f, 464 Bundle savedInstanceState) {} 465 466 /** 467 * Called after the fragment has returned from the FragmentManager's call to 468 * {@link Fragment#onCreate(Bundle)}. This will only happen once for any given 469 * fragment instance, though the fragment may be attached and detached multiple times. 470 * 471 * @param fm Host FragmentManager 472 * @param f Fragment changing state 473 * @param savedInstanceState Saved instance bundle from a previous instance 474 */ 475 public void onFragmentCreated(FragmentManager fm, Fragment f, Bundle savedInstanceState) {} 476 477 /** 478 * Called after the fragment has returned from the FragmentManager's call to 479 * {@link Fragment#onActivityCreated(Bundle)}. This will only happen once for any given 480 * fragment instance, though the fragment may be attached and detached multiple times. 481 * 482 * @param fm Host FragmentManager 483 * @param f Fragment changing state 484 * @param savedInstanceState Saved instance bundle from a previous instance 485 */ 486 public void onFragmentActivityCreated(FragmentManager fm, Fragment f, 487 Bundle savedInstanceState) {} 488 489 /** 490 * Called after the fragment has returned a non-null view from the FragmentManager's 491 * request to {@link Fragment#onCreateView(LayoutInflater, ViewGroup, Bundle)}. 492 * 493 * @param fm Host FragmentManager 494 * @param f Fragment that created and owns the view 495 * @param v View returned by the fragment 496 * @param savedInstanceState Saved instance bundle from a previous instance 497 */ 498 public void onFragmentViewCreated(FragmentManager fm, Fragment f, View v, 499 Bundle savedInstanceState) {} 500 501 /** 502 * Called after the fragment has returned from the FragmentManager's call to 503 * {@link Fragment#onStart()}. 504 * 505 * @param fm Host FragmentManager 506 * @param f Fragment changing state 507 */ 508 public void onFragmentStarted(FragmentManager fm, Fragment f) {} 509 510 /** 511 * Called after the fragment has returned from the FragmentManager's call to 512 * {@link Fragment#onResume()}. 513 * 514 * @param fm Host FragmentManager 515 * @param f Fragment changing state 516 */ 517 public void onFragmentResumed(FragmentManager fm, Fragment f) {} 518 519 /** 520 * Called after the fragment has returned from the FragmentManager's call to 521 * {@link Fragment#onPause()}. 522 * 523 * @param fm Host FragmentManager 524 * @param f Fragment changing state 525 */ 526 public void onFragmentPaused(FragmentManager fm, Fragment f) {} 527 528 /** 529 * Called after the fragment has returned from the FragmentManager's call to 530 * {@link Fragment#onStop()}. 531 * 532 * @param fm Host FragmentManager 533 * @param f Fragment changing state 534 */ 535 public void onFragmentStopped(FragmentManager fm, Fragment f) {} 536 537 /** 538 * Called after the fragment has returned from the FragmentManager's call to 539 * {@link Fragment#onSaveInstanceState(Bundle)}. 540 * 541 * @param fm Host FragmentManager 542 * @param f Fragment changing state 543 * @param outState Saved state bundle for the fragment 544 */ 545 public void onFragmentSaveInstanceState(FragmentManager fm, Fragment f, Bundle outState) {} 546 547 /** 548 * Called after the fragment has returned from the FragmentManager's call to 549 * {@link Fragment#onDestroyView()}. 550 * 551 * @param fm Host FragmentManager 552 * @param f Fragment changing state 553 */ 554 public void onFragmentViewDestroyed(FragmentManager fm, Fragment f) {} 555 556 /** 557 * Called after the fragment has returned from the FragmentManager's call to 558 * {@link Fragment#onDestroy()}. 559 * 560 * @param fm Host FragmentManager 561 * @param f Fragment changing state 562 */ 563 public void onFragmentDestroyed(FragmentManager fm, Fragment f) {} 564 565 /** 566 * Called after the fragment has returned from the FragmentManager's call to 567 * {@link Fragment#onDetach()}. 568 * 569 * @param fm Host FragmentManager 570 * @param f Fragment changing state 571 */ 572 public void onFragmentDetached(FragmentManager fm, Fragment f) {} 573 } 574} 575 576final class FragmentManagerState implements Parcelable { 577 FragmentState[] mActive; 578 int[] mAdded; 579 BackStackState[] mBackStack; 580 int mPrimaryNavActiveIndex = -1; 581 int mNextFragmentIndex; 582 583 public FragmentManagerState() { 584 } 585 586 public FragmentManagerState(Parcel in) { 587 mActive = in.createTypedArray(FragmentState.CREATOR); 588 mAdded = in.createIntArray(); 589 mBackStack = in.createTypedArray(BackStackState.CREATOR); 590 mPrimaryNavActiveIndex = in.readInt(); 591 mNextFragmentIndex = in.readInt(); 592 } 593 594 public int describeContents() { 595 return 0; 596 } 597 598 public void writeToParcel(Parcel dest, int flags) { 599 dest.writeTypedArray(mActive, flags); 600 dest.writeIntArray(mAdded); 601 dest.writeTypedArray(mBackStack, flags); 602 dest.writeInt(mPrimaryNavActiveIndex); 603 dest.writeInt(mNextFragmentIndex); 604 } 605 606 public static final Parcelable.Creator<FragmentManagerState> CREATOR 607 = new Parcelable.Creator<FragmentManagerState>() { 608 public FragmentManagerState createFromParcel(Parcel in) { 609 return new FragmentManagerState(in); 610 } 611 612 public FragmentManagerState[] newArray(int size) { 613 return new FragmentManagerState[size]; 614 } 615 }; 616} 617 618/** 619 * Container for fragments associated with an activity. 620 */ 621final class FragmentManagerImpl extends FragmentManager implements LayoutInflater.Factory2 { 622 static boolean DEBUG = false; 623 static final String TAG = "FragmentManager"; 624 625 static final String TARGET_REQUEST_CODE_STATE_TAG = "android:target_req_state"; 626 static final String TARGET_STATE_TAG = "android:target_state"; 627 static final String VIEW_STATE_TAG = "android:view_state"; 628 static final String USER_VISIBLE_HINT_TAG = "android:user_visible_hint"; 629 630 static class AnimateOnHWLayerIfNeededListener implements Animator.AnimatorListener { 631 private boolean mShouldRunOnHWLayer = false; 632 private View mView; 633 public AnimateOnHWLayerIfNeededListener(final View v) { 634 if (v == null) { 635 return; 636 } 637 mView = v; 638 } 639 640 @Override 641 public void onAnimationStart(Animator animation) { 642 mShouldRunOnHWLayer = shouldRunOnHWLayer(mView, animation); 643 if (mShouldRunOnHWLayer) { 644 mView.setLayerType(View.LAYER_TYPE_HARDWARE, null); 645 } 646 } 647 648 @Override 649 public void onAnimationEnd(Animator animation) { 650 if (mShouldRunOnHWLayer) { 651 mView.setLayerType(View.LAYER_TYPE_NONE, null); 652 } 653 mView = null; 654 animation.removeListener(this); 655 } 656 657 @Override 658 public void onAnimationCancel(Animator animation) { 659 660 } 661 662 @Override 663 public void onAnimationRepeat(Animator animation) { 664 665 } 666 } 667 668 ArrayList<OpGenerator> mPendingActions; 669 boolean mExecutingActions; 670 671 int mNextFragmentIndex = 0; 672 SparseArray<Fragment> mActive; 673 ArrayList<Fragment> mAdded; 674 ArrayList<BackStackRecord> mBackStack; 675 ArrayList<Fragment> mCreatedMenus; 676 677 // Must be accessed while locked. 678 ArrayList<BackStackRecord> mBackStackIndices; 679 ArrayList<Integer> mAvailBackStackIndices; 680 681 ArrayList<OnBackStackChangedListener> mBackStackChangeListeners; 682 CopyOnWriteArrayList<Pair<FragmentLifecycleCallbacks, Boolean>> mLifecycleCallbacks; 683 684 int mCurState = Fragment.INITIALIZING; 685 FragmentHostCallback<?> mHost; 686 FragmentContainer mContainer; 687 Fragment mParent; 688 Fragment mPrimaryNav; 689 690 boolean mNeedMenuInvalidate; 691 boolean mStateSaved; 692 boolean mDestroyed; 693 String mNoTransactionsBecause; 694 boolean mHavePendingDeferredStart; 695 696 // Temporary vars for removing redundant operations in BackStackRecords: 697 ArrayList<BackStackRecord> mTmpRecords; 698 ArrayList<Boolean> mTmpIsPop; 699 ArrayList<Fragment> mTmpAddedFragments; 700 701 // Temporary vars for state save and restore. 702 Bundle mStateBundle = null; 703 SparseArray<Parcelable> mStateArray = null; 704 705 // Postponed transactions. 706 ArrayList<StartEnterTransitionListener> mPostponedTransactions; 707 708 // Prior to O, we allowed executing transactions during fragment manager state changes. 709 // This is dangerous, but we want to keep from breaking old applications. 710 boolean mAllowOldReentrantBehavior; 711 712 // Saved FragmentManagerNonConfig during saveAllState() and cleared in noteStateNotSaved() 713 FragmentManagerNonConfig mSavedNonConfig; 714 715 Runnable mExecCommit = new Runnable() { 716 @Override 717 public void run() { 718 execPendingActions(); 719 } 720 }; 721 722 private void throwException(RuntimeException ex) { 723 Log.e(TAG, ex.getMessage()); 724 LogWriter logw = new LogWriter(Log.ERROR, TAG); 725 PrintWriter pw = new FastPrintWriter(logw, false, 1024); 726 if (mHost != null) { 727 Log.e(TAG, "Activity state:"); 728 try { 729 mHost.onDump(" ", null, pw, new String[] { }); 730 } catch (Exception e) { 731 pw.flush(); 732 Log.e(TAG, "Failed dumping state", e); 733 } 734 } else { 735 Log.e(TAG, "Fragment manager state:"); 736 try { 737 dump(" ", null, pw, new String[] { }); 738 } catch (Exception e) { 739 pw.flush(); 740 Log.e(TAG, "Failed dumping state", e); 741 } 742 } 743 pw.flush(); 744 throw ex; 745 } 746 747 static boolean modifiesAlpha(Animator anim) { 748 if (anim == null) { 749 return false; 750 } 751 if (anim instanceof ValueAnimator) { 752 ValueAnimator valueAnim = (ValueAnimator) anim; 753 PropertyValuesHolder[] values = valueAnim.getValues(); 754 for (int i = 0; i < values.length; i++) { 755 if (("alpha").equals(values[i].getPropertyName())) { 756 return true; 757 } 758 } 759 } else if (anim instanceof AnimatorSet) { 760 List<Animator> animList = ((AnimatorSet) anim).getChildAnimations(); 761 for (int i = 0; i < animList.size(); i++) { 762 if (modifiesAlpha(animList.get(i))) { 763 return true; 764 } 765 } 766 } 767 return false; 768 } 769 770 static boolean shouldRunOnHWLayer(View v, Animator anim) { 771 if (v == null || anim == null) { 772 return false; 773 } 774 return v.getLayerType() == View.LAYER_TYPE_NONE 775 && v.hasOverlappingRendering() 776 && modifiesAlpha(anim); 777 } 778 779 /** 780 * Sets the to be animated view on hardware layer during the animation. 781 */ 782 private void setHWLayerAnimListenerIfAlpha(final View v, Animator anim) { 783 if (v == null || anim == null) { 784 return; 785 } 786 if (shouldRunOnHWLayer(v, anim)) { 787 anim.addListener(new AnimateOnHWLayerIfNeededListener(v)); 788 } 789 } 790 791 @Override 792 public FragmentTransaction beginTransaction() { 793 return new BackStackRecord(this); 794 } 795 796 @Override 797 public boolean executePendingTransactions() { 798 boolean updates = execPendingActions(); 799 forcePostponedTransactions(); 800 return updates; 801 } 802 803 @Override 804 public void popBackStack() { 805 enqueueAction(new PopBackStackState(null, -1, 0), false); 806 } 807 808 @Override 809 public boolean popBackStackImmediate() { 810 checkStateLoss(); 811 return popBackStackImmediate(null, -1, 0); 812 } 813 814 @Override 815 public void popBackStack(String name, int flags) { 816 enqueueAction(new PopBackStackState(name, -1, flags), false); 817 } 818 819 @Override 820 public boolean popBackStackImmediate(String name, int flags) { 821 checkStateLoss(); 822 return popBackStackImmediate(name, -1, flags); 823 } 824 825 @Override 826 public void popBackStack(int id, int flags) { 827 if (id < 0) { 828 throw new IllegalArgumentException("Bad id: " + id); 829 } 830 enqueueAction(new PopBackStackState(null, id, flags), false); 831 } 832 833 @Override 834 public boolean popBackStackImmediate(int id, int flags) { 835 checkStateLoss(); 836 if (id < 0) { 837 throw new IllegalArgumentException("Bad id: " + id); 838 } 839 return popBackStackImmediate(null, id, flags); 840 } 841 842 /** 843 * Used by all public popBackStackImmediate methods, this executes pending transactions and 844 * returns true if the pop action did anything, regardless of what other pending 845 * transactions did. 846 * 847 * @return true if the pop operation did anything or false otherwise. 848 */ 849 private boolean popBackStackImmediate(String name, int id, int flags) { 850 execPendingActions(); 851 ensureExecReady(true); 852 853 if (mPrimaryNav != null // We have a primary nav fragment 854 && id < 0 // No valid id (since they're local) 855 && name == null) { // no name to pop to (since they're local) 856 final FragmentManager childManager = mPrimaryNav.mChildFragmentManager; 857 if (childManager != null && childManager.popBackStackImmediate()) { 858 // We did something, just not to this specific FragmentManager. Return true. 859 return true; 860 } 861 } 862 863 boolean executePop = popBackStackState(mTmpRecords, mTmpIsPop, name, id, flags); 864 if (executePop) { 865 mExecutingActions = true; 866 try { 867 removeRedundantOperationsAndExecute(mTmpRecords, mTmpIsPop); 868 } finally { 869 cleanupExec(); 870 } 871 } 872 873 doPendingDeferredStart(); 874 burpActive(); 875 return executePop; 876 } 877 878 @Override 879 public int getBackStackEntryCount() { 880 return mBackStack != null ? mBackStack.size() : 0; 881 } 882 883 @Override 884 public BackStackEntry getBackStackEntryAt(int index) { 885 return mBackStack.get(index); 886 } 887 888 @Override 889 public void addOnBackStackChangedListener(OnBackStackChangedListener listener) { 890 if (mBackStackChangeListeners == null) { 891 mBackStackChangeListeners = new ArrayList<OnBackStackChangedListener>(); 892 } 893 mBackStackChangeListeners.add(listener); 894 } 895 896 @Override 897 public void removeOnBackStackChangedListener(OnBackStackChangedListener listener) { 898 if (mBackStackChangeListeners != null) { 899 mBackStackChangeListeners.remove(listener); 900 } 901 } 902 903 @Override 904 public void putFragment(Bundle bundle, String key, Fragment fragment) { 905 if (fragment.mIndex < 0) { 906 throwException(new IllegalStateException("Fragment " + fragment 907 + " is not currently in the FragmentManager")); 908 } 909 bundle.putInt(key, fragment.mIndex); 910 } 911 912 @Override 913 public Fragment getFragment(Bundle bundle, String key) { 914 int index = bundle.getInt(key, -1); 915 if (index == -1) { 916 return null; 917 } 918 Fragment f = mActive.get(index); 919 if (f == null) { 920 throwException(new IllegalStateException("Fragment no longer exists for key " 921 + key + ": index " + index)); 922 } 923 return f; 924 } 925 926 @Override 927 public List<Fragment> getFragments() { 928 if (mAdded == null) { 929 return Collections.EMPTY_LIST; 930 } 931 synchronized (mAdded) { 932 return (List<Fragment>) mAdded.clone(); 933 } 934 } 935 936 @Override 937 public Fragment.SavedState saveFragmentInstanceState(Fragment fragment) { 938 if (fragment.mIndex < 0) { 939 throwException(new IllegalStateException("Fragment " + fragment 940 + " is not currently in the FragmentManager")); 941 } 942 if (fragment.mState > Fragment.INITIALIZING) { 943 Bundle result = saveFragmentBasicState(fragment); 944 return result != null ? new Fragment.SavedState(result) : null; 945 } 946 return null; 947 } 948 949 @Override 950 public boolean isDestroyed() { 951 return mDestroyed; 952 } 953 954 @Override 955 public String toString() { 956 StringBuilder sb = new StringBuilder(128); 957 sb.append("FragmentManager{"); 958 sb.append(Integer.toHexString(System.identityHashCode(this))); 959 sb.append(" in "); 960 if (mParent != null) { 961 DebugUtils.buildShortClassTag(mParent, sb); 962 } else { 963 DebugUtils.buildShortClassTag(mHost, sb); 964 } 965 sb.append("}}"); 966 return sb.toString(); 967 } 968 969 @Override 970 public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) { 971 String innerPrefix = prefix + " "; 972 973 int N; 974 if (mActive != null) { 975 N = mActive.size(); 976 if (N > 0) { 977 writer.print(prefix); writer.print("Active Fragments in "); 978 writer.print(Integer.toHexString(System.identityHashCode(this))); 979 writer.println(":"); 980 for (int i=0; i<N; i++) { 981 Fragment f = mActive.valueAt(i); 982 writer.print(prefix); writer.print(" #"); writer.print(i); 983 writer.print(": "); writer.println(f); 984 if (f != null) { 985 f.dump(innerPrefix, fd, writer, args); 986 } 987 } 988 } 989 } 990 991 if (mAdded != null) { 992 N = mAdded.size(); 993 if (N > 0) { 994 writer.print(prefix); writer.println("Added Fragments:"); 995 for (int i=0; i<N; i++) { 996 Fragment f = mAdded.get(i); 997 writer.print(prefix); writer.print(" #"); writer.print(i); 998 writer.print(": "); writer.println(f.toString()); 999 } 1000 } 1001 } 1002 1003 if (mCreatedMenus != null) { 1004 N = mCreatedMenus.size(); 1005 if (N > 0) { 1006 writer.print(prefix); writer.println("Fragments Created Menus:"); 1007 for (int i=0; i<N; i++) { 1008 Fragment f = mCreatedMenus.get(i); 1009 writer.print(prefix); writer.print(" #"); writer.print(i); 1010 writer.print(": "); writer.println(f.toString()); 1011 } 1012 } 1013 } 1014 1015 if (mBackStack != null) { 1016 N = mBackStack.size(); 1017 if (N > 0) { 1018 writer.print(prefix); writer.println("Back Stack:"); 1019 for (int i=0; i<N; i++) { 1020 BackStackRecord bs = mBackStack.get(i); 1021 writer.print(prefix); writer.print(" #"); writer.print(i); 1022 writer.print(": "); writer.println(bs.toString()); 1023 bs.dump(innerPrefix, fd, writer, args); 1024 } 1025 } 1026 } 1027 1028 synchronized (this) { 1029 if (mBackStackIndices != null) { 1030 N = mBackStackIndices.size(); 1031 if (N > 0) { 1032 writer.print(prefix); writer.println("Back Stack Indices:"); 1033 for (int i=0; i<N; i++) { 1034 BackStackRecord bs = mBackStackIndices.get(i); 1035 writer.print(prefix); writer.print(" #"); writer.print(i); 1036 writer.print(": "); writer.println(bs); 1037 } 1038 } 1039 } 1040 1041 if (mAvailBackStackIndices != null && mAvailBackStackIndices.size() > 0) { 1042 writer.print(prefix); writer.print("mAvailBackStackIndices: "); 1043 writer.println(Arrays.toString(mAvailBackStackIndices.toArray())); 1044 } 1045 } 1046 1047 if (mPendingActions != null) { 1048 N = mPendingActions.size(); 1049 if (N > 0) { 1050 writer.print(prefix); writer.println("Pending Actions:"); 1051 for (int i=0; i<N; i++) { 1052 OpGenerator r = mPendingActions.get(i); 1053 writer.print(prefix); writer.print(" #"); writer.print(i); 1054 writer.print(": "); writer.println(r); 1055 } 1056 } 1057 } 1058 1059 writer.print(prefix); writer.println("FragmentManager misc state:"); 1060 writer.print(prefix); writer.print(" mHost="); writer.println(mHost); 1061 writer.print(prefix); writer.print(" mContainer="); writer.println(mContainer); 1062 if (mParent != null) { 1063 writer.print(prefix); writer.print(" mParent="); writer.println(mParent); 1064 } 1065 writer.print(prefix); writer.print(" mCurState="); writer.print(mCurState); 1066 writer.print(" mStateSaved="); writer.print(mStateSaved); 1067 writer.print(" mDestroyed="); writer.println(mDestroyed); 1068 if (mNeedMenuInvalidate) { 1069 writer.print(prefix); writer.print(" mNeedMenuInvalidate="); 1070 writer.println(mNeedMenuInvalidate); 1071 } 1072 if (mNoTransactionsBecause != null) { 1073 writer.print(prefix); writer.print(" mNoTransactionsBecause="); 1074 writer.println(mNoTransactionsBecause); 1075 } 1076 } 1077 1078 Animator loadAnimator(Fragment fragment, int transit, boolean enter, 1079 int transitionStyle) { 1080 Animator animObj = fragment.onCreateAnimator(transit, enter, fragment.getNextAnim()); 1081 if (animObj != null) { 1082 return animObj; 1083 } 1084 1085 if (fragment.getNextAnim() != 0) { 1086 Animator anim = AnimatorInflater.loadAnimator(mHost.getContext(), 1087 fragment.getNextAnim()); 1088 if (anim != null) { 1089 return anim; 1090 } 1091 } 1092 1093 if (transit == 0) { 1094 return null; 1095 } 1096 1097 int styleIndex = transitToStyleIndex(transit, enter); 1098 if (styleIndex < 0) { 1099 return null; 1100 } 1101 1102 if (transitionStyle == 0 && mHost.onHasWindowAnimations()) { 1103 transitionStyle = mHost.onGetWindowAnimations(); 1104 } 1105 if (transitionStyle == 0) { 1106 return null; 1107 } 1108 1109 TypedArray attrs = mHost.getContext().obtainStyledAttributes(transitionStyle, 1110 com.android.internal.R.styleable.FragmentAnimation); 1111 int anim = attrs.getResourceId(styleIndex, 0); 1112 attrs.recycle(); 1113 1114 if (anim == 0) { 1115 return null; 1116 } 1117 1118 return AnimatorInflater.loadAnimator(mHost.getContext(), anim); 1119 } 1120 1121 public void performPendingDeferredStart(Fragment f) { 1122 if (f.mDeferStart) { 1123 if (mExecutingActions) { 1124 // Wait until we're done executing our pending transactions 1125 mHavePendingDeferredStart = true; 1126 return; 1127 } 1128 f.mDeferStart = false; 1129 moveToState(f, mCurState, 0, 0, false); 1130 } 1131 } 1132 1133 boolean isStateAtLeast(int state) { 1134 return mCurState >= state; 1135 } 1136 1137 @SuppressWarnings("ReferenceEquality") 1138 void moveToState(Fragment f, int newState, int transit, int transitionStyle, 1139 boolean keepActive) { 1140 if (DEBUG && false) Log.v(TAG, "moveToState: " + f 1141 + " oldState=" + f.mState + " newState=" + newState 1142 + " mRemoving=" + f.mRemoving + " Callers=" + Debug.getCallers(5)); 1143 1144 // Fragments that are not currently added will sit in the onCreate() state. 1145 if ((!f.mAdded || f.mDetached) && newState > Fragment.CREATED) { 1146 newState = Fragment.CREATED; 1147 } 1148 if (f.mRemoving && newState > f.mState) { 1149 if (f.mState == Fragment.INITIALIZING && f.isInBackStack()) { 1150 // Allow the fragment to be created so that it can be saved later. 1151 newState = Fragment.CREATED; 1152 } else { 1153 // While removing a fragment, we can't change it to a higher state. 1154 newState = f.mState; 1155 } 1156 } 1157 // Defer start if requested; don't allow it to move to STARTED or higher 1158 // if it's not already started. 1159 if (f.mDeferStart && f.mState < Fragment.STARTED && newState > Fragment.STOPPED) { 1160 newState = Fragment.STOPPED; 1161 } 1162 if (f.mState <= newState) { 1163 // For fragments that are created from a layout, when restoring from 1164 // state we don't want to allow them to be created until they are 1165 // being reloaded from the layout. 1166 if (f.mFromLayout && !f.mInLayout) { 1167 return; 1168 } 1169 if (f.getAnimatingAway() != null) { 1170 // The fragment is currently being animated... but! Now we 1171 // want to move our state back up. Give up on waiting for the 1172 // animation, move to whatever the final state should be once 1173 // the animation is done, and then we can proceed from there. 1174 f.setAnimatingAway(null); 1175 moveToState(f, f.getStateAfterAnimating(), 0, 0, true); 1176 } 1177 switch (f.mState) { 1178 case Fragment.INITIALIZING: 1179 if (newState > Fragment.INITIALIZING) { 1180 if (DEBUG) Log.v(TAG, "moveto CREATED: " + f); 1181 if (f.mSavedFragmentState != null) { 1182 f.mSavedViewState = f.mSavedFragmentState.getSparseParcelableArray( 1183 FragmentManagerImpl.VIEW_STATE_TAG); 1184 f.mTarget = getFragment(f.mSavedFragmentState, 1185 FragmentManagerImpl.TARGET_STATE_TAG); 1186 if (f.mTarget != null) { 1187 f.mTargetRequestCode = f.mSavedFragmentState.getInt( 1188 FragmentManagerImpl.TARGET_REQUEST_CODE_STATE_TAG, 0); 1189 } 1190 f.mUserVisibleHint = f.mSavedFragmentState.getBoolean( 1191 FragmentManagerImpl.USER_VISIBLE_HINT_TAG, true); 1192 if (!f.mUserVisibleHint) { 1193 f.mDeferStart = true; 1194 if (newState > Fragment.STOPPED) { 1195 newState = Fragment.STOPPED; 1196 } 1197 } 1198 } 1199 1200 f.mHost = mHost; 1201 f.mParentFragment = mParent; 1202 f.mFragmentManager = mParent != null 1203 ? mParent.mChildFragmentManager : mHost.getFragmentManagerImpl(); 1204 1205 // If we have a target fragment, push it along to at least CREATED 1206 // so that this one can rely on it as an initialized dependency. 1207 if (f.mTarget != null) { 1208 if (mActive.get(f.mTarget.mIndex) != f.mTarget) { 1209 throw new IllegalStateException("Fragment " + f 1210 + " declared target fragment " + f.mTarget 1211 + " that does not belong to this FragmentManager!"); 1212 } 1213 if (f.mTarget.mState < Fragment.CREATED) { 1214 moveToState(f.mTarget, Fragment.CREATED, 0, 0, true); 1215 } 1216 } 1217 1218 dispatchOnFragmentPreAttached(f, mHost.getContext(), false); 1219 f.mCalled = false; 1220 f.onAttach(mHost.getContext()); 1221 if (!f.mCalled) { 1222 throw new SuperNotCalledException("Fragment " + f 1223 + " did not call through to super.onAttach()"); 1224 } 1225 if (f.mParentFragment == null) { 1226 mHost.onAttachFragment(f); 1227 } else { 1228 f.mParentFragment.onAttachFragment(f); 1229 } 1230 dispatchOnFragmentAttached(f, mHost.getContext(), false); 1231 1232 if (!f.mRetaining) { 1233 dispatchOnFragmentPreCreated(f, f.mSavedFragmentState, false); 1234 f.performCreate(f.mSavedFragmentState); 1235 dispatchOnFragmentCreated(f, f.mSavedFragmentState, false); 1236 } else { 1237 f.restoreChildFragmentState(f.mSavedFragmentState, true); 1238 f.mState = Fragment.CREATED; 1239 } 1240 f.mRetaining = false; 1241 } 1242 // fall through 1243 case Fragment.CREATED: 1244 // This is outside the if statement below on purpose; we want this to run 1245 // even if we do a moveToState from CREATED => *, CREATED => CREATED, and 1246 // * => CREATED as part of the case fallthrough above. 1247 ensureInflatedFragmentView(f); 1248 1249 if (newState > Fragment.CREATED) { 1250 if (DEBUG) Log.v(TAG, "moveto ACTIVITY_CREATED: " + f); 1251 if (!f.mFromLayout) { 1252 ViewGroup container = null; 1253 if (f.mContainerId != 0) { 1254 if (f.mContainerId == View.NO_ID) { 1255 throwException(new IllegalArgumentException( 1256 "Cannot create fragment " 1257 + f 1258 + " for a container view with no id")); 1259 } 1260 container = mContainer.onFindViewById(f.mContainerId); 1261 if (container == null && !f.mRestored) { 1262 String resName; 1263 try { 1264 resName = f.getResources().getResourceName(f.mContainerId); 1265 } catch (NotFoundException e) { 1266 resName = "unknown"; 1267 } 1268 throwException(new IllegalArgumentException( 1269 "No view found for id 0x" 1270 + Integer.toHexString(f.mContainerId) + " (" 1271 + resName 1272 + ") for fragment " + f)); 1273 } 1274 } 1275 f.mContainer = container; 1276 f.mView = f.performCreateView(f.performGetLayoutInflater( 1277 f.mSavedFragmentState), container, f.mSavedFragmentState); 1278 if (f.mView != null) { 1279 f.mView.setSaveFromParentEnabled(false); 1280 if (container != null) { 1281 container.addView(f.mView); 1282 } 1283 if (f.mHidden) { 1284 f.mView.setVisibility(View.GONE); 1285 } 1286 f.onViewCreated(f.mView, f.mSavedFragmentState); 1287 dispatchOnFragmentViewCreated(f, f.mView, f.mSavedFragmentState, 1288 false); 1289 // Only animate the view if it is visible. This is done after 1290 // dispatchOnFragmentViewCreated in case visibility is changed 1291 f.mIsNewlyAdded = (f.mView.getVisibility() == View.VISIBLE) 1292 && f.mContainer != null; 1293 } 1294 } 1295 1296 f.performActivityCreated(f.mSavedFragmentState); 1297 dispatchOnFragmentActivityCreated(f, f.mSavedFragmentState, false); 1298 if (f.mView != null) { 1299 f.restoreViewState(f.mSavedFragmentState); 1300 } 1301 f.mSavedFragmentState = null; 1302 } 1303 // fall through 1304 case Fragment.ACTIVITY_CREATED: 1305 if (newState > Fragment.ACTIVITY_CREATED) { 1306 f.mState = Fragment.STOPPED; 1307 } 1308 // fall through 1309 case Fragment.STOPPED: 1310 if (newState > Fragment.STOPPED) { 1311 if (DEBUG) Log.v(TAG, "moveto STARTED: " + f); 1312 f.performStart(); 1313 dispatchOnFragmentStarted(f, false); 1314 } 1315 // fall through 1316 case Fragment.STARTED: 1317 if (newState > Fragment.STARTED) { 1318 if (DEBUG) Log.v(TAG, "moveto RESUMED: " + f); 1319 f.performResume(); 1320 dispatchOnFragmentResumed(f, false); 1321 // Get rid of this in case we saved it and never needed it. 1322 f.mSavedFragmentState = null; 1323 f.mSavedViewState = null; 1324 } 1325 } 1326 } else if (f.mState > newState) { 1327 switch (f.mState) { 1328 case Fragment.RESUMED: 1329 if (newState < Fragment.RESUMED) { 1330 if (DEBUG) Log.v(TAG, "movefrom RESUMED: " + f); 1331 f.performPause(); 1332 dispatchOnFragmentPaused(f, false); 1333 } 1334 // fall through 1335 case Fragment.STARTED: 1336 if (newState < Fragment.STARTED) { 1337 if (DEBUG) Log.v(TAG, "movefrom STARTED: " + f); 1338 f.performStop(); 1339 dispatchOnFragmentStopped(f, false); 1340 } 1341 // fall through 1342 case Fragment.STOPPED: 1343 case Fragment.ACTIVITY_CREATED: 1344 if (newState < Fragment.ACTIVITY_CREATED) { 1345 if (DEBUG) Log.v(TAG, "movefrom ACTIVITY_CREATED: " + f); 1346 if (f.mView != null) { 1347 // Need to save the current view state if not 1348 // done already. 1349 if (mHost.onShouldSaveFragmentState(f) && f.mSavedViewState == null) { 1350 saveFragmentViewState(f); 1351 } 1352 } 1353 f.performDestroyView(); 1354 dispatchOnFragmentViewDestroyed(f, false); 1355 if (f.mView != null && f.mContainer != null) { 1356 if (getTargetSdk() >= Build.VERSION_CODES.O) { 1357 // Stop any current animations: 1358 f.mView.clearAnimation(); 1359 f.mContainer.endViewTransition(f.mView); 1360 } 1361 Animator anim = null; 1362 if (mCurState > Fragment.INITIALIZING && !mDestroyed 1363 && f.mView.getVisibility() == View.VISIBLE 1364 && f.mView.getTransitionAlpha() > 0) { 1365 anim = loadAnimator(f, transit, false, 1366 transitionStyle); 1367 } 1368 f.mView.setTransitionAlpha(1f); 1369 if (anim != null) { 1370 final ViewGroup container = f.mContainer; 1371 final View view = f.mView; 1372 final Fragment fragment = f; 1373 container.startViewTransition(view); 1374 f.setAnimatingAway(anim); 1375 f.setStateAfterAnimating(newState); 1376 anim.addListener(new AnimatorListenerAdapter() { 1377 @Override 1378 public void onAnimationEnd(Animator anim) { 1379 container.endViewTransition(view); 1380 if (fragment.getAnimatingAway() != null) { 1381 fragment.setAnimatingAway(null); 1382 moveToState(fragment, fragment.getStateAfterAnimating(), 1383 0, 0, false); 1384 } 1385 } 1386 }); 1387 anim.setTarget(f.mView); 1388 setHWLayerAnimListenerIfAlpha(f.mView, anim); 1389 anim.start(); 1390 1391 } 1392 f.mContainer.removeView(f.mView); 1393 } 1394 f.mContainer = null; 1395 f.mView = null; 1396 f.mInLayout = false; 1397 } 1398 // fall through 1399 case Fragment.CREATED: 1400 if (newState < Fragment.CREATED) { 1401 if (mDestroyed) { 1402 if (f.getAnimatingAway() != null) { 1403 // The fragment's containing activity is 1404 // being destroyed, but this fragment is 1405 // currently animating away. Stop the 1406 // animation right now -- it is not needed, 1407 // and we can't wait any more on destroying 1408 // the fragment. 1409 Animator anim = f.getAnimatingAway(); 1410 f.setAnimatingAway(null); 1411 anim.cancel(); 1412 } 1413 } 1414 if (f.getAnimatingAway() != null) { 1415 // We are waiting for the fragment's view to finish 1416 // animating away. Just make a note of the state 1417 // the fragment now should move to once the animation 1418 // is done. 1419 f.setStateAfterAnimating(newState); 1420 newState = Fragment.CREATED; 1421 } else { 1422 if (DEBUG) Log.v(TAG, "movefrom CREATED: " + f); 1423 if (!f.mRetaining) { 1424 f.performDestroy(); 1425 dispatchOnFragmentDestroyed(f, false); 1426 } else { 1427 f.mState = Fragment.INITIALIZING; 1428 } 1429 1430 f.performDetach(); 1431 dispatchOnFragmentDetached(f, false); 1432 if (!keepActive) { 1433 if (!f.mRetaining) { 1434 makeInactive(f); 1435 } else { 1436 f.mHost = null; 1437 f.mParentFragment = null; 1438 f.mFragmentManager = null; 1439 } 1440 } 1441 } 1442 } 1443 } 1444 } 1445 1446 if (f.mState != newState) { 1447 Log.w(TAG, "moveToState: Fragment state for " + f + " not updated inline; " 1448 + "expected state " + newState + " found " + f.mState); 1449 f.mState = newState; 1450 } 1451 } 1452 1453 void moveToState(Fragment f) { 1454 moveToState(f, mCurState, 0, 0, false); 1455 } 1456 1457 void ensureInflatedFragmentView(Fragment f) { 1458 if (f.mFromLayout && !f.mPerformedCreateView) { 1459 f.mView = f.performCreateView(f.performGetLayoutInflater( 1460 f.mSavedFragmentState), null, f.mSavedFragmentState); 1461 if (f.mView != null) { 1462 f.mView.setSaveFromParentEnabled(false); 1463 if (f.mHidden) f.mView.setVisibility(View.GONE); 1464 f.onViewCreated(f.mView, f.mSavedFragmentState); 1465 dispatchOnFragmentViewCreated(f, f.mView, f.mSavedFragmentState, false); 1466 } 1467 } 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 Animator anim = loadAnimator(fragment, fragment.getNextTransition(), !fragment.mHidden, 1483 fragment.getNextTransitionStyle()); 1484 if (anim != null) { 1485 anim.setTarget(fragment.mView); 1486 if (fragment.mHidden) { 1487 if (fragment.isHideReplaced()) { 1488 fragment.setHideReplaced(false); 1489 } else { 1490 final ViewGroup container = fragment.mContainer; 1491 final View animatingView = fragment.mView; 1492 if (container != null) { 1493 container.startViewTransition(animatingView); 1494 } 1495 // Delay the actual hide operation until the animation finishes, otherwise 1496 // the fragment will just immediately disappear 1497 anim.addListener(new AnimatorListenerAdapter() { 1498 @Override 1499 public void onAnimationEnd(Animator animation) { 1500 if (container != null) { 1501 container.endViewTransition(animatingView); 1502 } 1503 animation.removeListener(this); 1504 animatingView.setVisibility(View.GONE); 1505 } 1506 }); 1507 } 1508 } else { 1509 fragment.mView.setVisibility(View.VISIBLE); 1510 } 1511 setHWLayerAnimListenerIfAlpha(fragment.mView, anim); 1512 anim.start(); 1513 } else { 1514 final int visibility = fragment.mHidden && !fragment.isHideReplaced() 1515 ? View.GONE 1516 : View.VISIBLE; 1517 fragment.mView.setVisibility(visibility); 1518 if (fragment.isHideReplaced()) { 1519 fragment.setHideReplaced(false); 1520 } 1521 } 1522 } 1523 if (fragment.mAdded && fragment.mHasMenu && fragment.mMenuVisible) { 1524 mNeedMenuInvalidate = true; 1525 } 1526 fragment.mHiddenChanged = false; 1527 fragment.onHiddenChanged(fragment.mHidden); 1528 } 1529 1530 /** 1531 * Moves a fragment to its expected final state or the fragment manager's state, depending 1532 * on whether the fragment manager's state is raised properly. 1533 * 1534 * @param f The fragment to change. 1535 */ 1536 void moveFragmentToExpectedState(final Fragment f) { 1537 if (f == null) { 1538 return; 1539 } 1540 int nextState = mCurState; 1541 if (f.mRemoving) { 1542 if (f.isInBackStack()) { 1543 nextState = Math.min(nextState, Fragment.CREATED); 1544 } else { 1545 nextState = Math.min(nextState, Fragment.INITIALIZING); 1546 } 1547 } 1548 1549 moveToState(f, nextState, f.getNextTransition(), f.getNextTransitionStyle(), false); 1550 1551 if (f.mView != null) { 1552 // Move the view if it is out of order 1553 Fragment underFragment = findFragmentUnder(f); 1554 if (underFragment != null) { 1555 final View underView = underFragment.mView; 1556 // make sure this fragment is in the right order. 1557 final ViewGroup container = f.mContainer; 1558 int underIndex = container.indexOfChild(underView); 1559 int viewIndex = container.indexOfChild(f.mView); 1560 if (viewIndex < underIndex) { 1561 container.removeViewAt(viewIndex); 1562 container.addView(f.mView, underIndex); 1563 } 1564 } 1565 if (f.mIsNewlyAdded && f.mContainer != null) { 1566 // Make it visible and run the animations 1567 f.mView.setTransitionAlpha(1f); 1568 f.mIsNewlyAdded = false; 1569 // run animations: 1570 Animator anim = loadAnimator(f, f.getNextTransition(), true, f.getNextTransitionStyle()); 1571 if (anim != null) { 1572 anim.setTarget(f.mView); 1573 setHWLayerAnimListenerIfAlpha(f.mView, anim); 1574 anim.start(); 1575 } 1576 } 1577 } 1578 if (f.mHiddenChanged) { 1579 completeShowHideFragment(f); 1580 } 1581 } 1582 1583 /** 1584 * Changes the state of the fragment manager to {@code newState}. If the fragment manager 1585 * changes state or {@code always} is {@code true}, any fragments within it have their 1586 * states updated as well. 1587 * 1588 * @param newState The new state for the fragment manager 1589 * @param always If {@code true}, all fragments update their state, even 1590 * if {@code newState} matches the current fragment manager's state. 1591 */ 1592 void moveToState(int newState, boolean always) { 1593 if (mHost == null && newState != Fragment.INITIALIZING) { 1594 throw new IllegalStateException("No activity"); 1595 } 1596 1597 if (!always && mCurState == newState) { 1598 return; 1599 } 1600 1601 mCurState = newState; 1602 1603 if (mActive != null) { 1604 boolean loadersRunning = false; 1605 1606 // Must add them in the proper order. mActive fragments may be out of order 1607 if (mAdded != null) { 1608 final int numAdded = mAdded.size(); 1609 for (int i = 0; i < numAdded; i++) { 1610 Fragment f = mAdded.get(i); 1611 moveFragmentToExpectedState(f); 1612 if (f.mLoaderManager != null) { 1613 loadersRunning |= f.mLoaderManager.hasRunningLoaders(); 1614 } 1615 } 1616 } 1617 1618 // Now iterate through all active fragments. These will include those that are removed 1619 // and detached. 1620 final int numActive = mActive.size(); 1621 for (int i = 0; i < numActive; i++) { 1622 Fragment f = mActive.valueAt(i); 1623 if (f != null && (f.mRemoving || f.mDetached) && !f.mIsNewlyAdded) { 1624 moveFragmentToExpectedState(f); 1625 if (f.mLoaderManager != null) { 1626 loadersRunning |= f.mLoaderManager.hasRunningLoaders(); 1627 } 1628 } 1629 } 1630 1631 if (!loadersRunning) { 1632 startPendingDeferredFragments(); 1633 } 1634 1635 if (mNeedMenuInvalidate && mHost != null && mCurState == Fragment.RESUMED) { 1636 mHost.onInvalidateOptionsMenu(); 1637 mNeedMenuInvalidate = false; 1638 } 1639 } 1640 } 1641 1642 void startPendingDeferredFragments() { 1643 if (mActive == null) return; 1644 1645 for (int i=0; i<mActive.size(); i++) { 1646 Fragment f = mActive.valueAt(i); 1647 if (f != null) { 1648 performPendingDeferredStart(f); 1649 } 1650 } 1651 } 1652 1653 void makeActive(Fragment f) { 1654 if (f.mIndex >= 0) { 1655 return; 1656 } 1657 1658 f.setIndex(mNextFragmentIndex++, mParent); 1659 if (mActive == null) { 1660 mActive = new SparseArray<>(); 1661 } 1662 mActive.put(f.mIndex, f); 1663 if (DEBUG) Log.v(TAG, "Allocated fragment index " + f); 1664 } 1665 1666 void makeInactive(Fragment f) { 1667 if (f.mIndex < 0) { 1668 return; 1669 } 1670 1671 if (DEBUG) Log.v(TAG, "Freeing fragment index " + f); 1672 // Don't remove yet. That happens in burpActive(). This prevents 1673 // concurrent modification while iterating over mActive 1674 mActive.put(f.mIndex, null); 1675 mHost.inactivateFragment(f.mWho); 1676 f.initState(); 1677 } 1678 1679 public void addFragment(Fragment fragment, boolean moveToStateNow) { 1680 if (mAdded == null) { 1681 mAdded = new ArrayList<Fragment>(); 1682 } 1683 if (DEBUG) Log.v(TAG, "add: " + fragment); 1684 makeActive(fragment); 1685 if (!fragment.mDetached) { 1686 if (mAdded.contains(fragment)) { 1687 throw new IllegalStateException("Fragment already added: " + fragment); 1688 } 1689 synchronized (mAdded) { 1690 mAdded.add(fragment); 1691 } 1692 fragment.mAdded = true; 1693 fragment.mRemoving = false; 1694 if (fragment.mView == null) { 1695 fragment.mHiddenChanged = false; 1696 } 1697 if (fragment.mHasMenu && fragment.mMenuVisible) { 1698 mNeedMenuInvalidate = true; 1699 } 1700 if (moveToStateNow) { 1701 moveToState(fragment); 1702 } 1703 } 1704 } 1705 1706 public void removeFragment(Fragment fragment) { 1707 if (DEBUG) Log.v(TAG, "remove: " + fragment + " nesting=" + fragment.mBackStackNesting); 1708 final boolean inactive = !fragment.isInBackStack(); 1709 if (!fragment.mDetached || inactive) { 1710 if (false) { 1711 // Would be nice to catch a bad remove here, but we need 1712 // time to test this to make sure we aren't crashes cases 1713 // where it is not a problem. 1714 if (!mAdded.contains(fragment)) { 1715 throw new IllegalStateException("Fragment not added: " + fragment); 1716 } 1717 } 1718 if (mAdded != null) { 1719 synchronized (mAdded) { 1720 mAdded.remove(fragment); 1721 } 1722 } 1723 if (fragment.mHasMenu && fragment.mMenuVisible) { 1724 mNeedMenuInvalidate = true; 1725 } 1726 fragment.mAdded = false; 1727 fragment.mRemoving = true; 1728 } 1729 } 1730 1731 /** 1732 * Marks a fragment as hidden to be later animated in with 1733 * {@link #completeShowHideFragment(Fragment)}. 1734 * 1735 * @param fragment The fragment to be shown. 1736 */ 1737 public void hideFragment(Fragment fragment) { 1738 if (DEBUG) Log.v(TAG, "hide: " + fragment); 1739 if (!fragment.mHidden) { 1740 fragment.mHidden = true; 1741 // Toggle hidden changed so that if a fragment goes through show/hide/show 1742 // it doesn't go through the animation. 1743 fragment.mHiddenChanged = !fragment.mHiddenChanged; 1744 } 1745 } 1746 1747 /** 1748 * Marks a fragment as shown to be later animated in with 1749 * {@link #completeShowHideFragment(Fragment)}. 1750 * 1751 * @param fragment The fragment to be shown. 1752 */ 1753 public void showFragment(Fragment fragment) { 1754 if (DEBUG) Log.v(TAG, "show: " + fragment); 1755 if (fragment.mHidden) { 1756 fragment.mHidden = false; 1757 // Toggle hidden changed so that if a fragment goes through show/hide/show 1758 // it doesn't go through the animation. 1759 fragment.mHiddenChanged = !fragment.mHiddenChanged; 1760 } 1761 } 1762 1763 public void detachFragment(Fragment fragment) { 1764 if (DEBUG) Log.v(TAG, "detach: " + fragment); 1765 if (!fragment.mDetached) { 1766 fragment.mDetached = true; 1767 if (fragment.mAdded) { 1768 // We are not already in back stack, so need to remove the fragment. 1769 if (mAdded != null) { 1770 if (DEBUG) Log.v(TAG, "remove from detach: " + fragment); 1771 synchronized (mAdded) { 1772 mAdded.remove(fragment); 1773 } 1774 } 1775 if (fragment.mHasMenu && fragment.mMenuVisible) { 1776 mNeedMenuInvalidate = true; 1777 } 1778 fragment.mAdded = false; 1779 } 1780 } 1781 } 1782 1783 public void attachFragment(Fragment fragment) { 1784 if (DEBUG) Log.v(TAG, "attach: " + fragment); 1785 if (fragment.mDetached) { 1786 fragment.mDetached = false; 1787 if (!fragment.mAdded) { 1788 if (mAdded == null) { 1789 mAdded = new ArrayList<Fragment>(); 1790 } 1791 if (mAdded.contains(fragment)) { 1792 throw new IllegalStateException("Fragment already added: " + fragment); 1793 } 1794 if (DEBUG) Log.v(TAG, "add from attach: " + fragment); 1795 synchronized (mAdded) { 1796 mAdded.add(fragment); 1797 } 1798 fragment.mAdded = true; 1799 if (fragment.mHasMenu && fragment.mMenuVisible) { 1800 mNeedMenuInvalidate = true; 1801 } 1802 } 1803 } 1804 } 1805 1806 public Fragment findFragmentById(int id) { 1807 if (mAdded != null) { 1808 // First look through added fragments. 1809 for (int i=mAdded.size()-1; i>=0; i--) { 1810 Fragment f = mAdded.get(i); 1811 if (f != null && f.mFragmentId == id) { 1812 return f; 1813 } 1814 } 1815 } 1816 if (mActive != null) { 1817 // Now for any known fragment. 1818 for (int i=mActive.size()-1; i>=0; i--) { 1819 Fragment f = mActive.valueAt(i); 1820 if (f != null && f.mFragmentId == id) { 1821 return f; 1822 } 1823 } 1824 } 1825 return null; 1826 } 1827 1828 public Fragment findFragmentByTag(String tag) { 1829 if (mAdded != null && tag != null) { 1830 // First look through added fragments. 1831 for (int i=mAdded.size()-1; i>=0; i--) { 1832 Fragment f = mAdded.get(i); 1833 if (f != null && tag.equals(f.mTag)) { 1834 return f; 1835 } 1836 } 1837 } 1838 if (mActive != null && tag != null) { 1839 // Now for any known fragment. 1840 for (int i=mActive.size()-1; i>=0; i--) { 1841 Fragment f = mActive.valueAt(i); 1842 if (f != null && tag.equals(f.mTag)) { 1843 return f; 1844 } 1845 } 1846 } 1847 return null; 1848 } 1849 1850 public Fragment findFragmentByWho(String who) { 1851 if (mActive != null && who != null) { 1852 for (int i=mActive.size()-1; i>=0; i--) { 1853 Fragment f = mActive.valueAt(i); 1854 if (f != null && (f=f.findFragmentByWho(who)) != null) { 1855 return f; 1856 } 1857 } 1858 } 1859 return null; 1860 } 1861 1862 private void checkStateLoss() { 1863 if (mStateSaved) { 1864 throw new IllegalStateException( 1865 "Can not perform this action after onSaveInstanceState"); 1866 } 1867 if (mNoTransactionsBecause != null) { 1868 throw new IllegalStateException( 1869 "Can not perform this action inside of " + mNoTransactionsBecause); 1870 } 1871 } 1872 1873 @Override 1874 public boolean isStateSaved() { 1875 return mStateSaved; 1876 } 1877 1878 /** 1879 * Adds an action to the queue of pending actions. 1880 * 1881 * @param action the action to add 1882 * @param allowStateLoss whether to allow loss of state information 1883 * @throws IllegalStateException if the activity has been destroyed 1884 */ 1885 public void enqueueAction(OpGenerator action, boolean allowStateLoss) { 1886 if (!allowStateLoss) { 1887 checkStateLoss(); 1888 } 1889 synchronized (this) { 1890 if (mDestroyed || mHost == null) { 1891 if (allowStateLoss) { 1892 // This FragmentManager isn't attached, so drop the entire transaction. 1893 return; 1894 } 1895 throw new IllegalStateException("Activity has been destroyed"); 1896 } 1897 if (mPendingActions == null) { 1898 mPendingActions = new ArrayList<>(); 1899 } 1900 mPendingActions.add(action); 1901 scheduleCommit(); 1902 } 1903 } 1904 1905 /** 1906 * Schedules the execution when one hasn't been scheduled already. This should happen 1907 * the first time {@link #enqueueAction(OpGenerator, boolean)} is called or when 1908 * a postponed transaction has been started with 1909 * {@link Fragment#startPostponedEnterTransition()} 1910 */ 1911 private void scheduleCommit() { 1912 synchronized (this) { 1913 boolean postponeReady = 1914 mPostponedTransactions != null && !mPostponedTransactions.isEmpty(); 1915 boolean pendingReady = mPendingActions != null && mPendingActions.size() == 1; 1916 if (postponeReady || pendingReady) { 1917 mHost.getHandler().removeCallbacks(mExecCommit); 1918 mHost.getHandler().post(mExecCommit); 1919 } 1920 } 1921 } 1922 1923 public int allocBackStackIndex(BackStackRecord bse) { 1924 synchronized (this) { 1925 if (mAvailBackStackIndices == null || mAvailBackStackIndices.size() <= 0) { 1926 if (mBackStackIndices == null) { 1927 mBackStackIndices = new ArrayList<BackStackRecord>(); 1928 } 1929 int index = mBackStackIndices.size(); 1930 if (DEBUG) Log.v(TAG, "Setting back stack index " + index + " to " + bse); 1931 mBackStackIndices.add(bse); 1932 return index; 1933 1934 } else { 1935 int index = mAvailBackStackIndices.remove(mAvailBackStackIndices.size()-1); 1936 if (DEBUG) Log.v(TAG, "Adding back stack index " + index + " with " + bse); 1937 mBackStackIndices.set(index, bse); 1938 return index; 1939 } 1940 } 1941 } 1942 1943 public void setBackStackIndex(int index, BackStackRecord bse) { 1944 synchronized (this) { 1945 if (mBackStackIndices == null) { 1946 mBackStackIndices = new ArrayList<BackStackRecord>(); 1947 } 1948 int N = mBackStackIndices.size(); 1949 if (index < N) { 1950 if (DEBUG) Log.v(TAG, "Setting back stack index " + index + " to " + bse); 1951 mBackStackIndices.set(index, bse); 1952 } else { 1953 while (N < index) { 1954 mBackStackIndices.add(null); 1955 if (mAvailBackStackIndices == null) { 1956 mAvailBackStackIndices = new ArrayList<Integer>(); 1957 } 1958 if (DEBUG) Log.v(TAG, "Adding available back stack index " + N); 1959 mAvailBackStackIndices.add(N); 1960 N++; 1961 } 1962 if (DEBUG) Log.v(TAG, "Adding back stack index " + index + " with " + bse); 1963 mBackStackIndices.add(bse); 1964 } 1965 } 1966 } 1967 1968 public void freeBackStackIndex(int index) { 1969 synchronized (this) { 1970 mBackStackIndices.set(index, null); 1971 if (mAvailBackStackIndices == null) { 1972 mAvailBackStackIndices = new ArrayList<Integer>(); 1973 } 1974 if (DEBUG) Log.v(TAG, "Freeing back stack index " + index); 1975 mAvailBackStackIndices.add(index); 1976 } 1977 } 1978 1979 /** 1980 * Broken out from exec*, this prepares for gathering and executing operations. 1981 * 1982 * @param allowStateLoss true if state loss should be ignored or false if it should be 1983 * checked. 1984 */ 1985 private void ensureExecReady(boolean allowStateLoss) { 1986 if (mExecutingActions) { 1987 throw new IllegalStateException("FragmentManager is already executing transactions"); 1988 } 1989 1990 if (Looper.myLooper() != mHost.getHandler().getLooper()) { 1991 throw new IllegalStateException("Must be called from main thread of fragment host"); 1992 } 1993 1994 if (!allowStateLoss) { 1995 checkStateLoss(); 1996 } 1997 1998 if (mTmpRecords == null) { 1999 mTmpRecords = new ArrayList<>(); 2000 mTmpIsPop = new ArrayList<>(); 2001 } 2002 mExecutingActions = true; 2003 try { 2004 executePostponedTransaction(null, null); 2005 } finally { 2006 mExecutingActions = false; 2007 } 2008 } 2009 2010 public void execSingleAction(OpGenerator action, boolean allowStateLoss) { 2011 if (allowStateLoss && (mHost == null || mDestroyed)) { 2012 // This FragmentManager isn't attached, so drop the entire transaction. 2013 return; 2014 } 2015 ensureExecReady(allowStateLoss); 2016 if (action.generateOps(mTmpRecords, mTmpIsPop)) { 2017 mExecutingActions = true; 2018 try { 2019 removeRedundantOperationsAndExecute(mTmpRecords, mTmpIsPop); 2020 } finally { 2021 cleanupExec(); 2022 } 2023 } 2024 2025 doPendingDeferredStart(); 2026 burpActive(); 2027 } 2028 2029 /** 2030 * Broken out of exec*, this cleans up the mExecutingActions and the temporary structures 2031 * used in executing operations. 2032 */ 2033 private void cleanupExec() { 2034 mExecutingActions = false; 2035 mTmpIsPop.clear(); 2036 mTmpRecords.clear(); 2037 } 2038 2039 /** 2040 * Only call from main thread! 2041 */ 2042 public boolean execPendingActions() { 2043 ensureExecReady(true); 2044 2045 boolean didSomething = false; 2046 while (generateOpsForPendingActions(mTmpRecords, mTmpIsPop)) { 2047 mExecutingActions = true; 2048 try { 2049 removeRedundantOperationsAndExecute(mTmpRecords, mTmpIsPop); 2050 } finally { 2051 cleanupExec(); 2052 } 2053 didSomething = true; 2054 } 2055 2056 doPendingDeferredStart(); 2057 burpActive(); 2058 2059 return didSomething; 2060 } 2061 2062 /** 2063 * Complete the execution of transactions that have previously been postponed, but are 2064 * now ready. 2065 */ 2066 private void executePostponedTransaction(ArrayList<BackStackRecord> records, 2067 ArrayList<Boolean> isRecordPop) { 2068 int numPostponed = mPostponedTransactions == null ? 0 : mPostponedTransactions.size(); 2069 for (int i = 0; i < numPostponed; i++) { 2070 StartEnterTransitionListener listener = mPostponedTransactions.get(i); 2071 if (records != null && !listener.mIsBack) { 2072 int index = records.indexOf(listener.mRecord); 2073 if (index != -1 && isRecordPop.get(index)) { 2074 listener.cancelTransaction(); 2075 continue; 2076 } 2077 } 2078 if (listener.isReady() || (records != null && 2079 listener.mRecord.interactsWith(records, 0, records.size()))) { 2080 mPostponedTransactions.remove(i); 2081 i--; 2082 numPostponed--; 2083 int index; 2084 if (records != null && !listener.mIsBack && 2085 (index = records.indexOf(listener.mRecord)) != -1 && 2086 isRecordPop.get(index)) { 2087 // This is popping a postponed transaction 2088 listener.cancelTransaction(); 2089 } else { 2090 listener.completeTransaction(); 2091 } 2092 } 2093 } 2094 } 2095 2096 /** 2097 * Remove redundant BackStackRecord operations and executes them. This method merges operations 2098 * of proximate records that allow reordering. See 2099 * {@link FragmentTransaction#setReorderingAllowed(boolean)}. 2100 * <p> 2101 * For example, a transaction that adds to the back stack and then another that pops that 2102 * back stack record will be optimized to remove the unnecessary operation. 2103 * <p> 2104 * Likewise, two transactions committed that are executed at the same time will be optimized 2105 * to remove the redundant operations as well as two pop operations executed together. 2106 * 2107 * @param records The records pending execution 2108 * @param isRecordPop The direction that these records are being run. 2109 */ 2110 private void removeRedundantOperationsAndExecute(ArrayList<BackStackRecord> records, 2111 ArrayList<Boolean> isRecordPop) { 2112 if (records == null || records.isEmpty()) { 2113 return; 2114 } 2115 2116 if (isRecordPop == null || records.size() != isRecordPop.size()) { 2117 throw new IllegalStateException("Internal error with the back stack records"); 2118 } 2119 2120 // Force start of any postponed transactions that interact with scheduled transactions: 2121 executePostponedTransaction(records, isRecordPop); 2122 2123 final int numRecords = records.size(); 2124 int startIndex = 0; 2125 for (int recordNum = 0; recordNum < numRecords; recordNum++) { 2126 final boolean canReorder = records.get(recordNum).mReorderingAllowed; 2127 if (!canReorder) { 2128 // execute all previous transactions 2129 if (startIndex != recordNum) { 2130 executeOpsTogether(records, isRecordPop, startIndex, recordNum); 2131 } 2132 // execute all pop operations that don't allow reordering together or 2133 // one add operation 2134 int reorderingEnd = recordNum + 1; 2135 if (isRecordPop.get(recordNum)) { 2136 while (reorderingEnd < numRecords 2137 && isRecordPop.get(reorderingEnd) 2138 && !records.get(reorderingEnd).mReorderingAllowed) { 2139 reorderingEnd++; 2140 } 2141 } 2142 executeOpsTogether(records, isRecordPop, recordNum, reorderingEnd); 2143 startIndex = reorderingEnd; 2144 recordNum = reorderingEnd - 1; 2145 } 2146 } 2147 if (startIndex != numRecords) { 2148 executeOpsTogether(records, isRecordPop, startIndex, numRecords); 2149 } 2150 } 2151 2152 /** 2153 * Executes a subset of a list of BackStackRecords, all of which either allow reordering or 2154 * do not allow ordering. 2155 * @param records A list of BackStackRecords that are to be executed together 2156 * @param isRecordPop The direction that these records are being run. 2157 * @param startIndex The index of the first record in <code>records</code> to be executed 2158 * @param endIndex One more than the final record index in <code>records</code> to executed. 2159 */ 2160 private void executeOpsTogether(ArrayList<BackStackRecord> records, 2161 ArrayList<Boolean> isRecordPop, int startIndex, int endIndex) { 2162 final boolean allowReordering = records.get(startIndex).mReorderingAllowed; 2163 boolean addToBackStack = false; 2164 if (mTmpAddedFragments == null) { 2165 mTmpAddedFragments = new ArrayList<>(); 2166 } else { 2167 mTmpAddedFragments.clear(); 2168 } 2169 if (mAdded != null) { 2170 mTmpAddedFragments.addAll(mAdded); 2171 } 2172 Fragment oldPrimaryNav = getPrimaryNavigationFragment(); 2173 for (int recordNum = startIndex; recordNum < endIndex; recordNum++) { 2174 final BackStackRecord record = records.get(recordNum); 2175 final boolean isPop = isRecordPop.get(recordNum); 2176 if (!isPop) { 2177 oldPrimaryNav = record.expandOps(mTmpAddedFragments, oldPrimaryNav); 2178 } else { 2179 record.trackAddedFragmentsInPop(mTmpAddedFragments); 2180 } 2181 addToBackStack = addToBackStack || record.mAddToBackStack; 2182 } 2183 mTmpAddedFragments.clear(); 2184 2185 if (!allowReordering) { 2186 FragmentTransition.startTransitions(this, records, isRecordPop, startIndex, endIndex, 2187 false); 2188 } 2189 executeOps(records, isRecordPop, startIndex, endIndex); 2190 2191 int postponeIndex = endIndex; 2192 if (allowReordering) { 2193 ArraySet<Fragment> addedFragments = new ArraySet<>(); 2194 addAddedFragments(addedFragments); 2195 postponeIndex = postponePostponableTransactions(records, isRecordPop, 2196 startIndex, endIndex, addedFragments); 2197 makeRemovedFragmentsInvisible(addedFragments); 2198 } 2199 2200 if (postponeIndex != startIndex && allowReordering) { 2201 // need to run something now 2202 FragmentTransition.startTransitions(this, records, isRecordPop, startIndex, 2203 postponeIndex, true); 2204 moveToState(mCurState, true); 2205 } 2206 2207 for (int recordNum = startIndex; recordNum < endIndex; recordNum++) { 2208 final BackStackRecord record = records.get(recordNum); 2209 final boolean isPop = isRecordPop.get(recordNum); 2210 if (isPop && record.mIndex >= 0) { 2211 freeBackStackIndex(record.mIndex); 2212 record.mIndex = -1; 2213 } 2214 record.runOnCommitRunnables(); 2215 } 2216 2217 if (addToBackStack) { 2218 reportBackStackChanged(); 2219 } 2220 } 2221 2222 /** 2223 * Any fragments that were removed because they have been postponed should have their views 2224 * made invisible by setting their transition alpha to 0. 2225 * 2226 * @param fragments The fragments that were added during operation execution. Only the ones 2227 * that are no longer added will have their transition alpha changed. 2228 */ 2229 private void makeRemovedFragmentsInvisible(ArraySet<Fragment> fragments) { 2230 final int numAdded = fragments.size(); 2231 for (int i = 0; i < numAdded; i++) { 2232 final Fragment fragment = fragments.valueAt(i); 2233 if (!fragment.mAdded) { 2234 final View view = fragment.getView(); 2235 view.setTransitionAlpha(0f); 2236 } 2237 } 2238 } 2239 2240 /** 2241 * Examine all transactions and determine which ones are marked as postponed. Those will 2242 * have their operations rolled back and moved to the end of the record list (up to endIndex). 2243 * It will also add the postponed transaction to the queue. 2244 * 2245 * @param records A list of BackStackRecords that should be checked. 2246 * @param isRecordPop The direction that these records are being run. 2247 * @param startIndex The index of the first record in <code>records</code> to be checked 2248 * @param endIndex One more than the final record index in <code>records</code> to be checked. 2249 * @return The index of the first postponed transaction or endIndex if no transaction was 2250 * postponed. 2251 */ 2252 private int postponePostponableTransactions(ArrayList<BackStackRecord> records, 2253 ArrayList<Boolean> isRecordPop, int startIndex, int endIndex, 2254 ArraySet<Fragment> added) { 2255 int postponeIndex = endIndex; 2256 for (int i = endIndex - 1; i >= startIndex; i--) { 2257 final BackStackRecord record = records.get(i); 2258 final boolean isPop = isRecordPop.get(i); 2259 boolean isPostponed = record.isPostponed() && 2260 !record.interactsWith(records, i + 1, endIndex); 2261 if (isPostponed) { 2262 if (mPostponedTransactions == null) { 2263 mPostponedTransactions = new ArrayList<>(); 2264 } 2265 StartEnterTransitionListener listener = 2266 new StartEnterTransitionListener(record, isPop); 2267 mPostponedTransactions.add(listener); 2268 record.setOnStartPostponedListener(listener); 2269 2270 // roll back the transaction 2271 if (isPop) { 2272 record.executeOps(); 2273 } else { 2274 record.executePopOps(false); 2275 } 2276 2277 // move to the end 2278 postponeIndex--; 2279 if (i != postponeIndex) { 2280 records.remove(i); 2281 records.add(postponeIndex, record); 2282 } 2283 2284 // different views may be visible now 2285 addAddedFragments(added); 2286 } 2287 } 2288 return postponeIndex; 2289 } 2290 2291 /** 2292 * When a postponed transaction is ready to be started, this completes the transaction, 2293 * removing, hiding, or showing views as well as starting the animations and transitions. 2294 * <p> 2295 * {@code runtransitions} is set to false when the transaction postponement was interrupted 2296 * abnormally -- normally by a new transaction being started that affects the postponed 2297 * transaction. 2298 * 2299 * @param record The transaction to run 2300 * @param isPop true if record is popping or false if it is adding 2301 * @param runTransitions true if the fragment transition should be run or false otherwise. 2302 * @param moveToState true if the state should be changed after executing the operations. 2303 * This is false when the transaction is canceled when a postponed 2304 * transaction is popped. 2305 */ 2306 private void completeExecute(BackStackRecord record, boolean isPop, boolean runTransitions, 2307 boolean moveToState) { 2308 if (isPop) { 2309 record.executePopOps(moveToState); 2310 } else { 2311 record.executeOps(); 2312 } 2313 ArrayList<BackStackRecord> records = new ArrayList<>(1); 2314 ArrayList<Boolean> isRecordPop = new ArrayList<>(1); 2315 records.add(record); 2316 isRecordPop.add(isPop); 2317 if (runTransitions) { 2318 FragmentTransition.startTransitions(this, records, isRecordPop, 0, 1, true); 2319 } 2320 if (moveToState) { 2321 moveToState(mCurState, true); 2322 } 2323 2324 if (mActive != null) { 2325 final int numActive = mActive.size(); 2326 for (int i = 0; i < numActive; i++) { 2327 // Allow added fragments to be removed during the pop since we aren't going 2328 // to move them to the final state with moveToState(mCurState). 2329 Fragment fragment = mActive.valueAt(i); 2330 if (fragment != null && fragment.mView != null && fragment.mIsNewlyAdded 2331 && record.interactsWith(fragment.mContainerId)) { 2332 fragment.mIsNewlyAdded = false; 2333 } 2334 } 2335 } 2336 } 2337 2338 /** 2339 * Find a fragment within the fragment's container whose View should be below the passed 2340 * fragment. {@code null} is returned when the fragment has no View or if there should be 2341 * no fragment with a View below the given fragment. 2342 * 2343 * As an example, if mAdded has two Fragments with Views sharing the same container: 2344 * FragmentA 2345 * FragmentB 2346 * 2347 * Then, when processing FragmentB, FragmentA will be returned. If, however, FragmentA 2348 * had no View, null would be returned. 2349 * 2350 * @param f The fragment that may be on top of another fragment. 2351 * @return The fragment with a View under f, if one exists or null if f has no View or 2352 * there are no fragments with Views in the same container. 2353 */ 2354 private Fragment findFragmentUnder(Fragment f) { 2355 final ViewGroup container = f.mContainer; 2356 final View view = f.mView; 2357 2358 if (container == null || view == null) { 2359 return null; 2360 } 2361 2362 final int fragmentIndex = mAdded.indexOf(f); 2363 for (int i = fragmentIndex - 1; i >= 0; i--) { 2364 Fragment underFragment = mAdded.get(i); 2365 if (underFragment.mContainer == container && underFragment.mView != null) { 2366 // Found the fragment under this one 2367 return underFragment; 2368 } 2369 } 2370 return null; 2371 } 2372 2373 /** 2374 * Run the operations in the BackStackRecords, either to push or pop. 2375 * 2376 * @param records The list of records whose operations should be run. 2377 * @param isRecordPop The direction that these records are being run. 2378 * @param startIndex The index of the first entry in records to run. 2379 * @param endIndex One past the index of the final entry in records to run. 2380 */ 2381 private static void executeOps(ArrayList<BackStackRecord> records, 2382 ArrayList<Boolean> isRecordPop, int startIndex, int endIndex) { 2383 for (int i = startIndex; i < endIndex; i++) { 2384 final BackStackRecord record = records.get(i); 2385 final boolean isPop = isRecordPop.get(i); 2386 if (isPop) { 2387 record.bumpBackStackNesting(-1); 2388 // Only execute the add operations at the end of 2389 // all transactions. 2390 boolean moveToState = i == (endIndex - 1); 2391 record.executePopOps(moveToState); 2392 } else { 2393 record.bumpBackStackNesting(1); 2394 record.executeOps(); 2395 } 2396 } 2397 } 2398 2399 /** 2400 * Ensure that fragments that are added are moved to at least the CREATED state. 2401 * Any newly-added Views are inserted into {@code added} so that the Transaction can be 2402 * postponed with {@link Fragment#postponeEnterTransition()}. They will later be made 2403 * invisible by changing their transitionAlpha to 0 if they have been removed when postponed. 2404 */ 2405 private void addAddedFragments(ArraySet<Fragment> added) { 2406 if (mCurState < Fragment.CREATED) { 2407 return; 2408 } 2409 // We want to leave the fragment in the started state 2410 final int state = Math.min(mCurState, Fragment.STARTED); 2411 final int numAdded = mAdded == null ? 0 : mAdded.size(); 2412 for (int i = 0; i < numAdded; i++) { 2413 Fragment fragment = mAdded.get(i); 2414 if (fragment.mState < state) { 2415 moveToState(fragment, state, fragment.getNextAnim(), fragment.getNextTransition(), false); 2416 if (fragment.mView != null && !fragment.mHidden && fragment.mIsNewlyAdded) { 2417 added.add(fragment); 2418 } 2419 } 2420 } 2421 } 2422 2423 /** 2424 * Starts all postponed transactions regardless of whether they are ready or not. 2425 */ 2426 private void forcePostponedTransactions() { 2427 if (mPostponedTransactions != null) { 2428 while (!mPostponedTransactions.isEmpty()) { 2429 mPostponedTransactions.remove(0).completeTransaction(); 2430 } 2431 } 2432 } 2433 2434 /** 2435 * Ends the animations of fragments so that they immediately reach the end state. 2436 * This is used prior to saving the state so that the correct state is saved. 2437 */ 2438 private void endAnimatingAwayFragments() { 2439 final int numFragments = mActive == null ? 0 : mActive.size(); 2440 for (int i = 0; i < numFragments; i++) { 2441 Fragment fragment = mActive.valueAt(i); 2442 if (fragment != null && fragment.getAnimatingAway() != null) { 2443 // Give up waiting for the animation and just end it. 2444 fragment.getAnimatingAway().end(); 2445 } 2446 } 2447 } 2448 2449 /** 2450 * Adds all records in the pending actions to records and whether they are add or pop 2451 * operations to isPop. After executing, the pending actions will be empty. 2452 * 2453 * @param records All pending actions will generate BackStackRecords added to this. 2454 * This contains the transactions, in order, to execute. 2455 * @param isPop All pending actions will generate booleans to add to this. This contains 2456 * an entry for each entry in records to indicate whether or not it is a 2457 * pop action. 2458 */ 2459 private boolean generateOpsForPendingActions(ArrayList<BackStackRecord> records, 2460 ArrayList<Boolean> isPop) { 2461 boolean didSomething = false; 2462 synchronized (this) { 2463 if (mPendingActions == null || mPendingActions.size() == 0) { 2464 return false; 2465 } 2466 2467 final int numActions = mPendingActions.size(); 2468 for (int i = 0; i < numActions; i++) { 2469 didSomething |= mPendingActions.get(i).generateOps(records, isPop); 2470 } 2471 mPendingActions.clear(); 2472 mHost.getHandler().removeCallbacks(mExecCommit); 2473 } 2474 return didSomething; 2475 } 2476 2477 void doPendingDeferredStart() { 2478 if (mHavePendingDeferredStart) { 2479 boolean loadersRunning = false; 2480 for (int i=0; i<mActive.size(); i++) { 2481 Fragment f = mActive.valueAt(i); 2482 if (f != null && f.mLoaderManager != null) { 2483 loadersRunning |= f.mLoaderManager.hasRunningLoaders(); 2484 } 2485 } 2486 if (!loadersRunning) { 2487 mHavePendingDeferredStart = false; 2488 startPendingDeferredFragments(); 2489 } 2490 } 2491 } 2492 2493 void reportBackStackChanged() { 2494 if (mBackStackChangeListeners != null) { 2495 for (int i=0; i<mBackStackChangeListeners.size(); i++) { 2496 mBackStackChangeListeners.get(i).onBackStackChanged(); 2497 } 2498 } 2499 } 2500 2501 void addBackStackState(BackStackRecord state) { 2502 if (mBackStack == null) { 2503 mBackStack = new ArrayList<BackStackRecord>(); 2504 } 2505 mBackStack.add(state); 2506 } 2507 2508 boolean popBackStackState(ArrayList<BackStackRecord> records, ArrayList<Boolean> isRecordPop, 2509 String name, int id, int flags) { 2510 if (mBackStack == null) { 2511 return false; 2512 } 2513 if (name == null && id < 0 && (flags & POP_BACK_STACK_INCLUSIVE) == 0) { 2514 int last = mBackStack.size() - 1; 2515 if (last < 0) { 2516 return false; 2517 } 2518 records.add(mBackStack.remove(last)); 2519 isRecordPop.add(true); 2520 } else { 2521 int index = -1; 2522 if (name != null || id >= 0) { 2523 // If a name or ID is specified, look for that place in 2524 // the stack. 2525 index = mBackStack.size()-1; 2526 while (index >= 0) { 2527 BackStackRecord bss = mBackStack.get(index); 2528 if (name != null && name.equals(bss.getName())) { 2529 break; 2530 } 2531 if (id >= 0 && id == bss.mIndex) { 2532 break; 2533 } 2534 index--; 2535 } 2536 if (index < 0) { 2537 return false; 2538 } 2539 if ((flags&POP_BACK_STACK_INCLUSIVE) != 0) { 2540 index--; 2541 // Consume all following entries that match. 2542 while (index >= 0) { 2543 BackStackRecord bss = mBackStack.get(index); 2544 if ((name != null && name.equals(bss.getName())) 2545 || (id >= 0 && id == bss.mIndex)) { 2546 index--; 2547 continue; 2548 } 2549 break; 2550 } 2551 } 2552 } 2553 if (index == mBackStack.size()-1) { 2554 return false; 2555 } 2556 for (int i = mBackStack.size() - 1; i > index; i--) { 2557 records.add(mBackStack.remove(i)); 2558 isRecordPop.add(true); 2559 } 2560 } 2561 return true; 2562 } 2563 2564 FragmentManagerNonConfig retainNonConfig() { 2565 setRetaining(mSavedNonConfig); 2566 return mSavedNonConfig; 2567 } 2568 2569 /** 2570 * Recurse the FragmentManagerNonConfig fragments and set the mRetaining to true. This 2571 * was previously done while saving the non-config state, but that has been moved to 2572 * {@link #saveNonConfig()} called from {@link #saveAllState()}. If mRetaining is set too 2573 * early, the fragment won't be destroyed when the FragmentManager is destroyed. 2574 */ 2575 private static void setRetaining(FragmentManagerNonConfig nonConfig) { 2576 if (nonConfig == null) { 2577 return; 2578 } 2579 List<Fragment> fragments = nonConfig.getFragments(); 2580 if (fragments != null) { 2581 for (Fragment fragment : fragments) { 2582 fragment.mRetaining = true; 2583 } 2584 } 2585 List<FragmentManagerNonConfig> children = nonConfig.getChildNonConfigs(); 2586 if (children != null) { 2587 for (FragmentManagerNonConfig child : children) { 2588 setRetaining(child); 2589 } 2590 } 2591 } 2592 2593 void saveNonConfig() { 2594 ArrayList<Fragment> fragments = null; 2595 ArrayList<FragmentManagerNonConfig> childFragments = null; 2596 if (mActive != null) { 2597 for (int i=0; i<mActive.size(); i++) { 2598 Fragment f = mActive.valueAt(i); 2599 if (f != null) { 2600 if (f.mRetainInstance) { 2601 if (fragments == null) { 2602 fragments = new ArrayList<>(); 2603 } 2604 fragments.add(f); 2605 f.mTargetIndex = f.mTarget != null ? f.mTarget.mIndex : -1; 2606 if (DEBUG) Log.v(TAG, "retainNonConfig: keeping retained " + f); 2607 } 2608 FragmentManagerNonConfig child; 2609 if (f.mChildFragmentManager != null) { 2610 f.mChildFragmentManager.saveNonConfig(); 2611 child = f.mChildFragmentManager.mSavedNonConfig; 2612 } else { 2613 // f.mChildNonConfig may be not null, when the parent fragment is 2614 // in the backstack. 2615 child = f.mChildNonConfig; 2616 } 2617 2618 if (childFragments == null && child != null) { 2619 childFragments = new ArrayList<>(mActive.size()); 2620 for (int j = 0; j < i; j++) { 2621 childFragments.add(null); 2622 } 2623 } 2624 2625 if (childFragments != null) { 2626 childFragments.add(child); 2627 } 2628 } 2629 } 2630 } 2631 if (fragments == null && childFragments == null) { 2632 mSavedNonConfig = null; 2633 } else { 2634 mSavedNonConfig = new FragmentManagerNonConfig(fragments, childFragments); 2635 } 2636 } 2637 2638 void saveFragmentViewState(Fragment f) { 2639 if (f.mView == null) { 2640 return; 2641 } 2642 if (mStateArray == null) { 2643 mStateArray = new SparseArray<Parcelable>(); 2644 } else { 2645 mStateArray.clear(); 2646 } 2647 f.mView.saveHierarchyState(mStateArray); 2648 if (mStateArray.size() > 0) { 2649 f.mSavedViewState = mStateArray; 2650 mStateArray = null; 2651 } 2652 } 2653 2654 Bundle saveFragmentBasicState(Fragment f) { 2655 Bundle result = null; 2656 2657 if (mStateBundle == null) { 2658 mStateBundle = new Bundle(); 2659 } 2660 f.performSaveInstanceState(mStateBundle); 2661 dispatchOnFragmentSaveInstanceState(f, mStateBundle, false); 2662 if (!mStateBundle.isEmpty()) { 2663 result = mStateBundle; 2664 mStateBundle = null; 2665 } 2666 2667 if (f.mView != null) { 2668 saveFragmentViewState(f); 2669 } 2670 if (f.mSavedViewState != null) { 2671 if (result == null) { 2672 result = new Bundle(); 2673 } 2674 result.putSparseParcelableArray( 2675 FragmentManagerImpl.VIEW_STATE_TAG, f.mSavedViewState); 2676 } 2677 if (!f.mUserVisibleHint) { 2678 if (result == null) { 2679 result = new Bundle(); 2680 } 2681 // Only add this if it's not the default value 2682 result.putBoolean(FragmentManagerImpl.USER_VISIBLE_HINT_TAG, f.mUserVisibleHint); 2683 } 2684 2685 return result; 2686 } 2687 2688 Parcelable saveAllState() { 2689 // Make sure all pending operations have now been executed to get 2690 // our state update-to-date. 2691 forcePostponedTransactions(); 2692 endAnimatingAwayFragments(); 2693 execPendingActions(); 2694 2695 mStateSaved = true; 2696 mSavedNonConfig = null; 2697 2698 if (mActive == null || mActive.size() <= 0) { 2699 return null; 2700 } 2701 2702 // First collect all active fragments. 2703 int N = mActive.size(); 2704 FragmentState[] active = new FragmentState[N]; 2705 boolean haveFragments = false; 2706 for (int i=0; i<N; i++) { 2707 Fragment f = mActive.valueAt(i); 2708 if (f != null) { 2709 if (f.mIndex < 0) { 2710 throwException(new IllegalStateException( 2711 "Failure saving state: active " + f 2712 + " has cleared index: " + f.mIndex)); 2713 } 2714 2715 haveFragments = true; 2716 2717 FragmentState fs = new FragmentState(f); 2718 active[i] = fs; 2719 2720 if (f.mState > Fragment.INITIALIZING && fs.mSavedFragmentState == null) { 2721 fs.mSavedFragmentState = saveFragmentBasicState(f); 2722 2723 if (f.mTarget != null) { 2724 if (f.mTarget.mIndex < 0) { 2725 throwException(new IllegalStateException( 2726 "Failure saving state: " + f 2727 + " has target not in fragment manager: " + f.mTarget)); 2728 } 2729 if (fs.mSavedFragmentState == null) { 2730 fs.mSavedFragmentState = new Bundle(); 2731 } 2732 putFragment(fs.mSavedFragmentState, 2733 FragmentManagerImpl.TARGET_STATE_TAG, f.mTarget); 2734 if (f.mTargetRequestCode != 0) { 2735 fs.mSavedFragmentState.putInt( 2736 FragmentManagerImpl.TARGET_REQUEST_CODE_STATE_TAG, 2737 f.mTargetRequestCode); 2738 } 2739 } 2740 2741 } else { 2742 fs.mSavedFragmentState = f.mSavedFragmentState; 2743 } 2744 2745 if (DEBUG) Log.v(TAG, "Saved state of " + f + ": " 2746 + fs.mSavedFragmentState); 2747 } 2748 } 2749 2750 if (!haveFragments) { 2751 if (DEBUG) Log.v(TAG, "saveAllState: no fragments!"); 2752 return null; 2753 } 2754 2755 int[] added = null; 2756 BackStackState[] backStack = null; 2757 2758 // Build list of currently added fragments. 2759 if (mAdded != null) { 2760 N = mAdded.size(); 2761 if (N > 0) { 2762 added = new int[N]; 2763 for (int i=0; i<N; i++) { 2764 added[i] = mAdded.get(i).mIndex; 2765 if (added[i] < 0) { 2766 throwException(new IllegalStateException( 2767 "Failure saving state: active " + mAdded.get(i) 2768 + " has cleared index: " + added[i])); 2769 } 2770 if (DEBUG) Log.v(TAG, "saveAllState: adding fragment #" + i 2771 + ": " + mAdded.get(i)); 2772 } 2773 } 2774 } 2775 2776 // Now save back stack. 2777 if (mBackStack != null) { 2778 N = mBackStack.size(); 2779 if (N > 0) { 2780 backStack = new BackStackState[N]; 2781 for (int i=0; i<N; i++) { 2782 backStack[i] = new BackStackState(this, mBackStack.get(i)); 2783 if (DEBUG) Log.v(TAG, "saveAllState: adding back stack #" + i 2784 + ": " + mBackStack.get(i)); 2785 } 2786 } 2787 } 2788 2789 FragmentManagerState fms = new FragmentManagerState(); 2790 fms.mActive = active; 2791 fms.mAdded = added; 2792 fms.mBackStack = backStack; 2793 fms.mNextFragmentIndex = mNextFragmentIndex; 2794 if (mPrimaryNav != null) { 2795 fms.mPrimaryNavActiveIndex = mPrimaryNav.mIndex; 2796 } 2797 saveNonConfig(); 2798 return fms; 2799 } 2800 2801 void restoreAllState(Parcelable state, FragmentManagerNonConfig nonConfig) { 2802 // If there is no saved state at all, then there can not be 2803 // any nonConfig fragments either, so that is that. 2804 if (state == null) return; 2805 FragmentManagerState fms = (FragmentManagerState)state; 2806 if (fms.mActive == null) return; 2807 2808 List<FragmentManagerNonConfig> childNonConfigs = null; 2809 2810 // First re-attach any non-config instances we are retaining back 2811 // to their saved state, so we don't try to instantiate them again. 2812 if (nonConfig != null) { 2813 List<Fragment> nonConfigFragments = nonConfig.getFragments(); 2814 childNonConfigs = nonConfig.getChildNonConfigs(); 2815 final int count = nonConfigFragments != null ? nonConfigFragments.size() : 0; 2816 for (int i = 0; i < count; i++) { 2817 Fragment f = nonConfigFragments.get(i); 2818 if (DEBUG) Log.v(TAG, "restoreAllState: re-attaching retained " + f); 2819 int index = 0; // index of f in fms.mActive 2820 while (index < fms.mActive.length && fms.mActive[index].mIndex != f.mIndex) { 2821 index++; 2822 } 2823 if (index == fms.mActive.length) { 2824 throwException(new IllegalStateException("Could not find active fragment " 2825 + "with index " + f.mIndex)); 2826 } 2827 FragmentState fs = fms.mActive[index]; 2828 fs.mInstance = f; 2829 f.mSavedViewState = null; 2830 f.mBackStackNesting = 0; 2831 f.mInLayout = false; 2832 f.mAdded = false; 2833 f.mTarget = null; 2834 if (fs.mSavedFragmentState != null) { 2835 fs.mSavedFragmentState.setClassLoader(mHost.getContext().getClassLoader()); 2836 f.mSavedViewState = fs.mSavedFragmentState.getSparseParcelableArray( 2837 FragmentManagerImpl.VIEW_STATE_TAG); 2838 f.mSavedFragmentState = fs.mSavedFragmentState; 2839 } 2840 } 2841 } 2842 2843 // Build the full list of active fragments, instantiating them from 2844 // their saved state. 2845 mActive = new SparseArray<>(fms.mActive.length); 2846 for (int i=0; i<fms.mActive.length; i++) { 2847 FragmentState fs = fms.mActive[i]; 2848 if (fs != null) { 2849 FragmentManagerNonConfig childNonConfig = null; 2850 if (childNonConfigs != null && i < childNonConfigs.size()) { 2851 childNonConfig = childNonConfigs.get(i); 2852 } 2853 Fragment f = fs.instantiate(mHost, mContainer, mParent, childNonConfig); 2854 if (DEBUG) Log.v(TAG, "restoreAllState: active #" + i + ": " + f); 2855 mActive.put(f.mIndex, f); 2856 // Now that the fragment is instantiated (or came from being 2857 // retained above), clear mInstance in case we end up re-restoring 2858 // from this FragmentState again. 2859 fs.mInstance = null; 2860 } 2861 } 2862 2863 // Update the target of all retained fragments. 2864 if (nonConfig != null) { 2865 List<Fragment> nonConfigFragments = nonConfig.getFragments(); 2866 final int count = nonConfigFragments != null ? nonConfigFragments.size() : 0; 2867 for (int i = 0; i < count; i++) { 2868 Fragment f = nonConfigFragments.get(i); 2869 if (f.mTargetIndex >= 0) { 2870 f.mTarget = mActive.get(f.mTargetIndex); 2871 if (f.mTarget == null) { 2872 Log.w(TAG, "Re-attaching retained fragment " + f 2873 + " target no longer exists: " + f.mTargetIndex); 2874 f.mTarget = null; 2875 } 2876 } 2877 } 2878 } 2879 2880 // Build the list of currently added fragments. 2881 if (fms.mAdded != null) { 2882 mAdded = new ArrayList<Fragment>(fms.mAdded.length); 2883 for (int i=0; i<fms.mAdded.length; i++) { 2884 Fragment f = mActive.get(fms.mAdded[i]); 2885 if (f == null) { 2886 throwException(new IllegalStateException( 2887 "No instantiated fragment for index #" + fms.mAdded[i])); 2888 } 2889 f.mAdded = true; 2890 if (DEBUG) Log.v(TAG, "restoreAllState: added #" + i + ": " + f); 2891 if (mAdded.contains(f)) { 2892 throw new IllegalStateException("Already added!"); 2893 } 2894 synchronized (mAdded) { 2895 mAdded.add(f); 2896 } 2897 } 2898 } else { 2899 mAdded = null; 2900 } 2901 2902 // Build the back stack. 2903 if (fms.mBackStack != null) { 2904 mBackStack = new ArrayList<BackStackRecord>(fms.mBackStack.length); 2905 for (int i=0; i<fms.mBackStack.length; i++) { 2906 BackStackRecord bse = fms.mBackStack[i].instantiate(this); 2907 if (DEBUG) { 2908 Log.v(TAG, "restoreAllState: back stack #" + i 2909 + " (index " + bse.mIndex + "): " + bse); 2910 LogWriter logw = new LogWriter(Log.VERBOSE, TAG); 2911 PrintWriter pw = new FastPrintWriter(logw, false, 1024); 2912 bse.dump(" ", pw, false); 2913 pw.flush(); 2914 } 2915 mBackStack.add(bse); 2916 if (bse.mIndex >= 0) { 2917 setBackStackIndex(bse.mIndex, bse); 2918 } 2919 } 2920 } else { 2921 mBackStack = null; 2922 } 2923 2924 if (fms.mPrimaryNavActiveIndex >= 0) { 2925 mPrimaryNav = mActive.get(fms.mPrimaryNavActiveIndex); 2926 } 2927 2928 mNextFragmentIndex = fms.mNextFragmentIndex; 2929 } 2930 2931 /** 2932 * To prevent list modification errors, mActive sets values to null instead of 2933 * removing them when the Fragment becomes inactive. This cleans up the list at the 2934 * end of executing the transactions. 2935 */ 2936 private void burpActive() { 2937 if (mActive != null) { 2938 for (int i = mActive.size() - 1; i >= 0; i--) { 2939 if (mActive.valueAt(i) == null) { 2940 mActive.delete(mActive.keyAt(i)); 2941 } 2942 } 2943 } 2944 } 2945 2946 public void attachController(FragmentHostCallback<?> host, FragmentContainer container, 2947 Fragment parent) { 2948 if (mHost != null) throw new IllegalStateException("Already attached"); 2949 mHost = host; 2950 mContainer = container; 2951 mParent = parent; 2952 mAllowOldReentrantBehavior = getTargetSdk() <= Build.VERSION_CODES.N_MR1; 2953 } 2954 2955 /** 2956 * @return the target SDK of the FragmentManager's application info. If the 2957 * FragmentManager has been torn down, then 0 is returned. 2958 */ 2959 int getTargetSdk() { 2960 if (mHost != null) { 2961 Context context = mHost.getContext(); 2962 if (context != null) { 2963 ApplicationInfo info = context.getApplicationInfo(); 2964 if (info != null) { 2965 return info.targetSdkVersion; 2966 } 2967 } 2968 } 2969 return 0; 2970 } 2971 2972 public void noteStateNotSaved() { 2973 mSavedNonConfig = null; 2974 mStateSaved = false; 2975 final int addedCount = mAdded == null ? 0 : mAdded.size(); 2976 for (int i = 0; i < addedCount; i++) { 2977 Fragment fragment = mAdded.get(i); 2978 if (fragment != null) { 2979 fragment.noteStateNotSaved(); 2980 } 2981 } 2982 } 2983 2984 public void dispatchCreate() { 2985 mStateSaved = false; 2986 dispatchMoveToState(Fragment.CREATED); 2987 } 2988 2989 public void dispatchActivityCreated() { 2990 mStateSaved = false; 2991 dispatchMoveToState(Fragment.ACTIVITY_CREATED); 2992 } 2993 2994 public void dispatchStart() { 2995 mStateSaved = false; 2996 dispatchMoveToState(Fragment.STARTED); 2997 } 2998 2999 public void dispatchResume() { 3000 mStateSaved = false; 3001 dispatchMoveToState(Fragment.RESUMED); 3002 } 3003 3004 public void dispatchPause() { 3005 dispatchMoveToState(Fragment.STARTED); 3006 } 3007 3008 public void dispatchStop() { 3009 dispatchMoveToState(Fragment.STOPPED); 3010 } 3011 3012 public void dispatchDestroyView() { 3013 dispatchMoveToState(Fragment.CREATED); 3014 } 3015 3016 public void dispatchDestroy() { 3017 mDestroyed = true; 3018 execPendingActions(); 3019 dispatchMoveToState(Fragment.INITIALIZING); 3020 mHost = null; 3021 mContainer = null; 3022 mParent = null; 3023 } 3024 3025 /** 3026 * This method is called by dispatch* methods to change the FragmentManager's state. 3027 * It calls moveToState directly if the target SDK is older than O. Otherwise, it sets and 3028 * clears mExecutingActions to ensure that there is no reentrancy while the 3029 * FragmentManager is changing state. 3030 * 3031 * @param state The new state of the FragmentManager. 3032 */ 3033 private void dispatchMoveToState(int state) { 3034 if (mAllowOldReentrantBehavior) { 3035 moveToState(state, false); 3036 } else { 3037 try { 3038 mExecutingActions = true; 3039 moveToState(state, false); 3040 } finally { 3041 mExecutingActions = false; 3042 } 3043 } 3044 execPendingActions(); 3045 } 3046 3047 /** 3048 * @deprecated use {@link #dispatchMultiWindowModeChanged(boolean, Configuration)} 3049 */ 3050 @Deprecated 3051 public void dispatchMultiWindowModeChanged(boolean isInMultiWindowMode) { 3052 if (mAdded == null) { 3053 return; 3054 } 3055 for (int i = mAdded.size() - 1; i >= 0; --i) { 3056 final Fragment f = mAdded.get(i); 3057 if (f != null) { 3058 f.performMultiWindowModeChanged(isInMultiWindowMode); 3059 } 3060 } 3061 } 3062 3063 public void dispatchMultiWindowModeChanged(boolean isInMultiWindowMode, 3064 Configuration newConfig) { 3065 if (mAdded == null) { 3066 return; 3067 } 3068 for (int i = mAdded.size() - 1; i >= 0; --i) { 3069 final Fragment f = mAdded.get(i); 3070 if (f != null) { 3071 f.performMultiWindowModeChanged(isInMultiWindowMode, newConfig); 3072 } 3073 } 3074 } 3075 3076 /** 3077 * @deprecated use {@link #dispatchPictureInPictureModeChanged(boolean, Configuration)} 3078 */ 3079 @Deprecated 3080 public void dispatchPictureInPictureModeChanged(boolean isInPictureInPictureMode) { 3081 if (mAdded == null) { 3082 return; 3083 } 3084 for (int i = mAdded.size() - 1; i >= 0; --i) { 3085 final Fragment f = mAdded.get(i); 3086 if (f != null) { 3087 f.performPictureInPictureModeChanged(isInPictureInPictureMode); 3088 } 3089 } 3090 } 3091 3092 public void dispatchPictureInPictureModeChanged(boolean isInPictureInPictureMode, 3093 Configuration newConfig) { 3094 if (mAdded == null) { 3095 return; 3096 } 3097 for (int i = mAdded.size() - 1; i >= 0; --i) { 3098 final Fragment f = mAdded.get(i); 3099 if (f != null) { 3100 f.performPictureInPictureModeChanged(isInPictureInPictureMode, newConfig); 3101 } 3102 } 3103 } 3104 3105 public void dispatchConfigurationChanged(Configuration newConfig) { 3106 if (mAdded != null) { 3107 for (int i=0; i<mAdded.size(); i++) { 3108 Fragment f = mAdded.get(i); 3109 if (f != null) { 3110 f.performConfigurationChanged(newConfig); 3111 } 3112 } 3113 } 3114 } 3115 3116 public void dispatchLowMemory() { 3117 if (mAdded != null) { 3118 for (int i=0; i<mAdded.size(); i++) { 3119 Fragment f = mAdded.get(i); 3120 if (f != null) { 3121 f.performLowMemory(); 3122 } 3123 } 3124 } 3125 } 3126 3127 public void dispatchTrimMemory(int level) { 3128 if (mAdded != null) { 3129 for (int i=0; i<mAdded.size(); i++) { 3130 Fragment f = mAdded.get(i); 3131 if (f != null) { 3132 f.performTrimMemory(level); 3133 } 3134 } 3135 } 3136 } 3137 3138 public boolean dispatchCreateOptionsMenu(Menu menu, MenuInflater inflater) { 3139 boolean show = false; 3140 ArrayList<Fragment> newMenus = null; 3141 if (mAdded != null) { 3142 for (int i=0; i<mAdded.size(); i++) { 3143 Fragment f = mAdded.get(i); 3144 if (f != null) { 3145 if (f.performCreateOptionsMenu(menu, inflater)) { 3146 show = true; 3147 if (newMenus == null) { 3148 newMenus = new ArrayList<Fragment>(); 3149 } 3150 newMenus.add(f); 3151 } 3152 } 3153 } 3154 } 3155 3156 if (mCreatedMenus != null) { 3157 for (int i=0; i<mCreatedMenus.size(); i++) { 3158 Fragment f = mCreatedMenus.get(i); 3159 if (newMenus == null || !newMenus.contains(f)) { 3160 f.onDestroyOptionsMenu(); 3161 } 3162 } 3163 } 3164 3165 mCreatedMenus = newMenus; 3166 3167 return show; 3168 } 3169 3170 public boolean dispatchPrepareOptionsMenu(Menu menu) { 3171 boolean show = false; 3172 if (mAdded != null) { 3173 for (int i=0; i<mAdded.size(); i++) { 3174 Fragment f = mAdded.get(i); 3175 if (f != null) { 3176 if (f.performPrepareOptionsMenu(menu)) { 3177 show = true; 3178 } 3179 } 3180 } 3181 } 3182 return show; 3183 } 3184 3185 public boolean dispatchOptionsItemSelected(MenuItem item) { 3186 if (mAdded != null) { 3187 for (int i=0; i<mAdded.size(); i++) { 3188 Fragment f = mAdded.get(i); 3189 if (f != null) { 3190 if (f.performOptionsItemSelected(item)) { 3191 return true; 3192 } 3193 } 3194 } 3195 } 3196 return false; 3197 } 3198 3199 public boolean dispatchContextItemSelected(MenuItem item) { 3200 if (mAdded != null) { 3201 for (int i=0; i<mAdded.size(); i++) { 3202 Fragment f = mAdded.get(i); 3203 if (f != null) { 3204 if (f.performContextItemSelected(item)) { 3205 return true; 3206 } 3207 } 3208 } 3209 } 3210 return false; 3211 } 3212 3213 public void dispatchOptionsMenuClosed(Menu menu) { 3214 if (mAdded != null) { 3215 for (int i=0; i<mAdded.size(); i++) { 3216 Fragment f = mAdded.get(i); 3217 if (f != null) { 3218 f.performOptionsMenuClosed(menu); 3219 } 3220 } 3221 } 3222 } 3223 3224 @SuppressWarnings("ReferenceEquality") 3225 public void setPrimaryNavigationFragment(Fragment f) { 3226 if (f != null && (mActive.get(f.mIndex) != f 3227 || (f.mHost != null && f.getFragmentManager() != this))) { 3228 throw new IllegalArgumentException("Fragment " + f 3229 + " is not an active fragment of FragmentManager " + this); 3230 } 3231 mPrimaryNav = f; 3232 } 3233 3234 public Fragment getPrimaryNavigationFragment() { 3235 return mPrimaryNav; 3236 } 3237 3238 public void registerFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb, 3239 boolean recursive) { 3240 if (mLifecycleCallbacks == null) { 3241 mLifecycleCallbacks = new CopyOnWriteArrayList<>(); 3242 } 3243 mLifecycleCallbacks.add(new Pair(cb, recursive)); 3244 } 3245 3246 public void unregisterFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb) { 3247 if (mLifecycleCallbacks == null) { 3248 return; 3249 } 3250 3251 synchronized (mLifecycleCallbacks) { 3252 for (int i = 0, N = mLifecycleCallbacks.size(); i < N; i++) { 3253 if (mLifecycleCallbacks.get(i).first == cb) { 3254 mLifecycleCallbacks.remove(i); 3255 break; 3256 } 3257 } 3258 } 3259 } 3260 3261 void dispatchOnFragmentPreAttached(Fragment f, Context context, boolean onlyRecursive) { 3262 if (mParent != null) { 3263 FragmentManager parentManager = mParent.getFragmentManager(); 3264 if (parentManager instanceof FragmentManagerImpl) { 3265 ((FragmentManagerImpl) parentManager) 3266 .dispatchOnFragmentPreAttached(f, context, true); 3267 } 3268 } 3269 if (mLifecycleCallbacks == null) { 3270 return; 3271 } 3272 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3273 if (!onlyRecursive || p.second) { 3274 p.first.onFragmentPreAttached(this, f, context); 3275 } 3276 } 3277 } 3278 3279 void dispatchOnFragmentAttached(Fragment f, Context context, boolean onlyRecursive) { 3280 if (mParent != null) { 3281 FragmentManager parentManager = mParent.getFragmentManager(); 3282 if (parentManager instanceof FragmentManagerImpl) { 3283 ((FragmentManagerImpl) parentManager) 3284 .dispatchOnFragmentAttached(f, context, true); 3285 } 3286 } 3287 if (mLifecycleCallbacks == null) { 3288 return; 3289 } 3290 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3291 if (!onlyRecursive || p.second) { 3292 p.first.onFragmentAttached(this, f, context); 3293 } 3294 } 3295 } 3296 3297 void dispatchOnFragmentPreCreated(Fragment f, Bundle savedInstanceState, 3298 boolean onlyRecursive) { 3299 if (mParent != null) { 3300 FragmentManager parentManager = mParent.getFragmentManager(); 3301 if (parentManager instanceof FragmentManagerImpl) { 3302 ((FragmentManagerImpl) parentManager) 3303 .dispatchOnFragmentPreCreated(f, savedInstanceState, true); 3304 } 3305 } 3306 if (mLifecycleCallbacks == null) { 3307 return; 3308 } 3309 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3310 if (!onlyRecursive || p.second) { 3311 p.first.onFragmentPreCreated(this, f, savedInstanceState); 3312 } 3313 } 3314 } 3315 3316 void dispatchOnFragmentCreated(Fragment f, Bundle savedInstanceState, boolean onlyRecursive) { 3317 if (mParent != null) { 3318 FragmentManager parentManager = mParent.getFragmentManager(); 3319 if (parentManager instanceof FragmentManagerImpl) { 3320 ((FragmentManagerImpl) parentManager) 3321 .dispatchOnFragmentCreated(f, savedInstanceState, true); 3322 } 3323 } 3324 if (mLifecycleCallbacks == null) { 3325 return; 3326 } 3327 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3328 if (!onlyRecursive || p.second) { 3329 p.first.onFragmentCreated(this, f, savedInstanceState); 3330 } 3331 } 3332 } 3333 3334 void dispatchOnFragmentActivityCreated(Fragment f, Bundle savedInstanceState, 3335 boolean onlyRecursive) { 3336 if (mParent != null) { 3337 FragmentManager parentManager = mParent.getFragmentManager(); 3338 if (parentManager instanceof FragmentManagerImpl) { 3339 ((FragmentManagerImpl) parentManager) 3340 .dispatchOnFragmentActivityCreated(f, savedInstanceState, true); 3341 } 3342 } 3343 if (mLifecycleCallbacks == null) { 3344 return; 3345 } 3346 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3347 if (!onlyRecursive || p.second) { 3348 p.first.onFragmentActivityCreated(this, f, savedInstanceState); 3349 } 3350 } 3351 } 3352 3353 void dispatchOnFragmentViewCreated(Fragment f, View v, Bundle savedInstanceState, 3354 boolean onlyRecursive) { 3355 if (mParent != null) { 3356 FragmentManager parentManager = mParent.getFragmentManager(); 3357 if (parentManager instanceof FragmentManagerImpl) { 3358 ((FragmentManagerImpl) parentManager) 3359 .dispatchOnFragmentViewCreated(f, v, savedInstanceState, true); 3360 } 3361 } 3362 if (mLifecycleCallbacks == null) { 3363 return; 3364 } 3365 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3366 if (!onlyRecursive || p.second) { 3367 p.first.onFragmentViewCreated(this, f, v, savedInstanceState); 3368 } 3369 } 3370 } 3371 3372 void dispatchOnFragmentStarted(Fragment f, boolean onlyRecursive) { 3373 if (mParent != null) { 3374 FragmentManager parentManager = mParent.getFragmentManager(); 3375 if (parentManager instanceof FragmentManagerImpl) { 3376 ((FragmentManagerImpl) parentManager) 3377 .dispatchOnFragmentStarted(f, true); 3378 } 3379 } 3380 if (mLifecycleCallbacks == null) { 3381 return; 3382 } 3383 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3384 if (!onlyRecursive || p.second) { 3385 p.first.onFragmentStarted(this, f); 3386 } 3387 } 3388 } 3389 3390 void dispatchOnFragmentResumed(Fragment f, boolean onlyRecursive) { 3391 if (mParent != null) { 3392 FragmentManager parentManager = mParent.getFragmentManager(); 3393 if (parentManager instanceof FragmentManagerImpl) { 3394 ((FragmentManagerImpl) parentManager) 3395 .dispatchOnFragmentResumed(f, true); 3396 } 3397 } 3398 if (mLifecycleCallbacks == null) { 3399 return; 3400 } 3401 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3402 if (!onlyRecursive || p.second) { 3403 p.first.onFragmentResumed(this, f); 3404 } 3405 } 3406 } 3407 3408 void dispatchOnFragmentPaused(Fragment f, boolean onlyRecursive) { 3409 if (mParent != null) { 3410 FragmentManager parentManager = mParent.getFragmentManager(); 3411 if (parentManager instanceof FragmentManagerImpl) { 3412 ((FragmentManagerImpl) parentManager) 3413 .dispatchOnFragmentPaused(f, true); 3414 } 3415 } 3416 if (mLifecycleCallbacks == null) { 3417 return; 3418 } 3419 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3420 if (!onlyRecursive || p.second) { 3421 p.first.onFragmentPaused(this, f); 3422 } 3423 } 3424 } 3425 3426 void dispatchOnFragmentStopped(Fragment f, boolean onlyRecursive) { 3427 if (mParent != null) { 3428 FragmentManager parentManager = mParent.getFragmentManager(); 3429 if (parentManager instanceof FragmentManagerImpl) { 3430 ((FragmentManagerImpl) parentManager) 3431 .dispatchOnFragmentStopped(f, true); 3432 } 3433 } 3434 if (mLifecycleCallbacks == null) { 3435 return; 3436 } 3437 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3438 if (!onlyRecursive || p.second) { 3439 p.first.onFragmentStopped(this, f); 3440 } 3441 } 3442 } 3443 3444 void dispatchOnFragmentSaveInstanceState(Fragment f, Bundle outState, boolean onlyRecursive) { 3445 if (mParent != null) { 3446 FragmentManager parentManager = mParent.getFragmentManager(); 3447 if (parentManager instanceof FragmentManagerImpl) { 3448 ((FragmentManagerImpl) parentManager) 3449 .dispatchOnFragmentSaveInstanceState(f, outState, true); 3450 } 3451 } 3452 if (mLifecycleCallbacks == null) { 3453 return; 3454 } 3455 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3456 if (!onlyRecursive || p.second) { 3457 p.first.onFragmentSaveInstanceState(this, f, outState); 3458 } 3459 } 3460 } 3461 3462 void dispatchOnFragmentViewDestroyed(Fragment f, boolean onlyRecursive) { 3463 if (mParent != null) { 3464 FragmentManager parentManager = mParent.getFragmentManager(); 3465 if (parentManager instanceof FragmentManagerImpl) { 3466 ((FragmentManagerImpl) parentManager) 3467 .dispatchOnFragmentViewDestroyed(f, true); 3468 } 3469 } 3470 if (mLifecycleCallbacks == null) { 3471 return; 3472 } 3473 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3474 if (!onlyRecursive || p.second) { 3475 p.first.onFragmentViewDestroyed(this, f); 3476 } 3477 } 3478 } 3479 3480 void dispatchOnFragmentDestroyed(Fragment f, boolean onlyRecursive) { 3481 if (mParent != null) { 3482 FragmentManager parentManager = mParent.getFragmentManager(); 3483 if (parentManager instanceof FragmentManagerImpl) { 3484 ((FragmentManagerImpl) parentManager) 3485 .dispatchOnFragmentDestroyed(f, true); 3486 } 3487 } 3488 if (mLifecycleCallbacks == null) { 3489 return; 3490 } 3491 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3492 if (!onlyRecursive || p.second) { 3493 p.first.onFragmentDestroyed(this, f); 3494 } 3495 } 3496 } 3497 3498 void dispatchOnFragmentDetached(Fragment f, boolean onlyRecursive) { 3499 if (mParent != null) { 3500 FragmentManager parentManager = mParent.getFragmentManager(); 3501 if (parentManager instanceof FragmentManagerImpl) { 3502 ((FragmentManagerImpl) parentManager) 3503 .dispatchOnFragmentDetached(f, true); 3504 } 3505 } 3506 if (mLifecycleCallbacks == null) { 3507 return; 3508 } 3509 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3510 if (!onlyRecursive || p.second) { 3511 p.first.onFragmentDetached(this, f); 3512 } 3513 } 3514 } 3515 3516 @Override 3517 public void invalidateOptionsMenu() { 3518 if (mHost != null && mCurState == Fragment.RESUMED) { 3519 mHost.onInvalidateOptionsMenu(); 3520 } else { 3521 mNeedMenuInvalidate = true; 3522 } 3523 } 3524 3525 public static int reverseTransit(int transit) { 3526 int rev = 0; 3527 switch (transit) { 3528 case FragmentTransaction.TRANSIT_FRAGMENT_OPEN: 3529 rev = FragmentTransaction.TRANSIT_FRAGMENT_CLOSE; 3530 break; 3531 case FragmentTransaction.TRANSIT_FRAGMENT_CLOSE: 3532 rev = FragmentTransaction.TRANSIT_FRAGMENT_OPEN; 3533 break; 3534 case FragmentTransaction.TRANSIT_FRAGMENT_FADE: 3535 rev = FragmentTransaction.TRANSIT_FRAGMENT_FADE; 3536 break; 3537 } 3538 return rev; 3539 3540 } 3541 3542 public static int transitToStyleIndex(int transit, boolean enter) { 3543 int animAttr = -1; 3544 switch (transit) { 3545 case FragmentTransaction.TRANSIT_FRAGMENT_OPEN: 3546 animAttr = enter 3547 ? com.android.internal.R.styleable.FragmentAnimation_fragmentOpenEnterAnimation 3548 : com.android.internal.R.styleable.FragmentAnimation_fragmentOpenExitAnimation; 3549 break; 3550 case FragmentTransaction.TRANSIT_FRAGMENT_CLOSE: 3551 animAttr = enter 3552 ? com.android.internal.R.styleable.FragmentAnimation_fragmentCloseEnterAnimation 3553 : com.android.internal.R.styleable.FragmentAnimation_fragmentCloseExitAnimation; 3554 break; 3555 case FragmentTransaction.TRANSIT_FRAGMENT_FADE: 3556 animAttr = enter 3557 ? com.android.internal.R.styleable.FragmentAnimation_fragmentFadeEnterAnimation 3558 : com.android.internal.R.styleable.FragmentAnimation_fragmentFadeExitAnimation; 3559 break; 3560 } 3561 return animAttr; 3562 } 3563 3564 @Override 3565 public View onCreateView(View parent, String name, Context context, AttributeSet attrs) { 3566 if (!"fragment".equals(name)) { 3567 return null; 3568 } 3569 3570 String fname = attrs.getAttributeValue(null, "class"); 3571 TypedArray a = 3572 context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.Fragment); 3573 if (fname == null) { 3574 fname = a.getString(com.android.internal.R.styleable.Fragment_name); 3575 } 3576 int id = a.getResourceId(com.android.internal.R.styleable.Fragment_id, View.NO_ID); 3577 String tag = a.getString(com.android.internal.R.styleable.Fragment_tag); 3578 a.recycle(); 3579 3580 int containerId = parent != null ? parent.getId() : 0; 3581 if (containerId == View.NO_ID && id == View.NO_ID && tag == null) { 3582 throw new IllegalArgumentException(attrs.getPositionDescription() 3583 + ": Must specify unique android:id, android:tag, or have a parent with" 3584 + " an id for " + fname); 3585 } 3586 3587 // If we restored from a previous state, we may already have 3588 // instantiated this fragment from the state and should use 3589 // that instance instead of making a new one. 3590 Fragment fragment = id != View.NO_ID ? findFragmentById(id) : null; 3591 if (fragment == null && tag != null) { 3592 fragment = findFragmentByTag(tag); 3593 } 3594 if (fragment == null && containerId != View.NO_ID) { 3595 fragment = findFragmentById(containerId); 3596 } 3597 3598 if (FragmentManagerImpl.DEBUG) Log.v(TAG, "onCreateView: id=0x" 3599 + Integer.toHexString(id) + " fname=" + fname 3600 + " existing=" + fragment); 3601 if (fragment == null) { 3602 fragment = mContainer.instantiate(context, fname, null); 3603 fragment.mFromLayout = true; 3604 fragment.mFragmentId = id != 0 ? id : containerId; 3605 fragment.mContainerId = containerId; 3606 fragment.mTag = tag; 3607 fragment.mInLayout = true; 3608 fragment.mFragmentManager = this; 3609 fragment.mHost = mHost; 3610 fragment.onInflate(mHost.getContext(), attrs, fragment.mSavedFragmentState); 3611 addFragment(fragment, true); 3612 } else if (fragment.mInLayout) { 3613 // A fragment already exists and it is not one we restored from 3614 // previous state. 3615 throw new IllegalArgumentException(attrs.getPositionDescription() 3616 + ": Duplicate id 0x" + Integer.toHexString(id) 3617 + ", tag " + tag + ", or parent id 0x" + Integer.toHexString(containerId) 3618 + " with another fragment for " + fname); 3619 } else { 3620 // This fragment was retained from a previous instance; get it 3621 // going now. 3622 fragment.mInLayout = true; 3623 fragment.mHost = mHost; 3624 // If this fragment is newly instantiated (either right now, or 3625 // from last saved state), then give it the attributes to 3626 // initialize itself. 3627 if (!fragment.mRetaining) { 3628 fragment.onInflate(mHost.getContext(), attrs, fragment.mSavedFragmentState); 3629 } 3630 } 3631 3632 // If we haven't finished entering the CREATED state ourselves yet, 3633 // push the inflated child fragment along. This will ensureInflatedFragmentView 3634 // at the right phase of the lifecycle so that we will have mView populated 3635 // for compliant fragments below. 3636 if (mCurState < Fragment.CREATED && fragment.mFromLayout) { 3637 moveToState(fragment, Fragment.CREATED, 0, 0, false); 3638 } else { 3639 moveToState(fragment); 3640 } 3641 3642 if (fragment.mView == null) { 3643 throw new IllegalStateException("Fragment " + fname 3644 + " did not create a view."); 3645 } 3646 if (id != 0) { 3647 fragment.mView.setId(id); 3648 } 3649 if (fragment.mView.getTag() == null) { 3650 fragment.mView.setTag(tag); 3651 } 3652 return fragment.mView; 3653 } 3654 3655 @Override 3656 public View onCreateView(String name, Context context, AttributeSet attrs) { 3657 return null; 3658 } 3659 3660 LayoutInflater.Factory2 getLayoutInflaterFactory() { 3661 return this; 3662 } 3663 3664 /** 3665 * An add or pop transaction to be scheduled for the UI thread. 3666 */ 3667 interface OpGenerator { 3668 /** 3669 * Generate transactions to add to {@code records} and whether or not the transaction is 3670 * an add or pop to {@code isRecordPop}. 3671 * 3672 * records and isRecordPop must be added equally so that each transaction in records 3673 * matches the boolean for whether or not it is a pop in isRecordPop. 3674 * 3675 * @param records A list to add transactions to. 3676 * @param isRecordPop A list to add whether or not the transactions added to records is 3677 * a pop transaction. 3678 * @return true if something was added or false otherwise. 3679 */ 3680 boolean generateOps(ArrayList<BackStackRecord> records, ArrayList<Boolean> isRecordPop); 3681 } 3682 3683 /** 3684 * A pop operation OpGenerator. This will be run on the UI thread and will generate the 3685 * transactions that will be popped if anything can be popped. 3686 */ 3687 private class PopBackStackState implements OpGenerator { 3688 final String mName; 3689 final int mId; 3690 final int mFlags; 3691 3692 public PopBackStackState(String name, int id, int flags) { 3693 mName = name; 3694 mId = id; 3695 mFlags = flags; 3696 } 3697 3698 @Override 3699 public boolean generateOps(ArrayList<BackStackRecord> records, 3700 ArrayList<Boolean> isRecordPop) { 3701 if (mPrimaryNav != null // We have a primary nav fragment 3702 && mId < 0 // No valid id (since they're local) 3703 && mName == null) { // no name to pop to (since they're local) 3704 final FragmentManager childManager = mPrimaryNav.mChildFragmentManager; 3705 if (childManager != null && childManager.popBackStackImmediate()) { 3706 // We didn't add any operations for this FragmentManager even though 3707 // a child did do work. 3708 return false; 3709 } 3710 } 3711 return popBackStackState(records, isRecordPop, mName, mId, mFlags); 3712 } 3713 } 3714 3715 /** 3716 * A listener for a postponed transaction. This waits until 3717 * {@link Fragment#startPostponedEnterTransition()} is called or a transaction is started 3718 * that interacts with this one, based on interactions with the fragment container. 3719 */ 3720 static class StartEnterTransitionListener 3721 implements Fragment.OnStartEnterTransitionListener { 3722 private final boolean mIsBack; 3723 private final BackStackRecord mRecord; 3724 private int mNumPostponed; 3725 3726 public StartEnterTransitionListener(BackStackRecord record, boolean isBack) { 3727 mIsBack = isBack; 3728 mRecord = record; 3729 } 3730 3731 /** 3732 * Called from {@link Fragment#startPostponedEnterTransition()}, this decreases the 3733 * number of Fragments that are postponed. This may cause the transaction to schedule 3734 * to finish running and run transitions and animations. 3735 */ 3736 @Override 3737 public void onStartEnterTransition() { 3738 mNumPostponed--; 3739 if (mNumPostponed != 0) { 3740 return; 3741 } 3742 mRecord.mManager.scheduleCommit(); 3743 } 3744 3745 /** 3746 * Called from {@link Fragment# 3747 * setOnStartEnterTransitionListener(Fragment.OnStartEnterTransitionListener)}, this 3748 * increases the number of fragments that are postponed as part of this transaction. 3749 */ 3750 @Override 3751 public void startListening() { 3752 mNumPostponed++; 3753 } 3754 3755 /** 3756 * @return true if there are no more postponed fragments as part of the transaction. 3757 */ 3758 public boolean isReady() { 3759 return mNumPostponed == 0; 3760 } 3761 3762 /** 3763 * Completes the transaction and start the animations and transitions. This may skip 3764 * the transitions if this is called before all fragments have called 3765 * {@link Fragment#startPostponedEnterTransition()}. 3766 */ 3767 public void completeTransaction() { 3768 final boolean canceled; 3769 canceled = mNumPostponed > 0; 3770 FragmentManagerImpl manager = mRecord.mManager; 3771 final int numAdded = manager.mAdded.size(); 3772 for (int i = 0; i < numAdded; i++) { 3773 final Fragment fragment = manager.mAdded.get(i); 3774 fragment.setOnStartEnterTransitionListener(null); 3775 if (canceled && fragment.isPostponed()) { 3776 fragment.startPostponedEnterTransition(); 3777 } 3778 } 3779 mRecord.mManager.completeExecute(mRecord, mIsBack, !canceled, true); 3780 } 3781 3782 /** 3783 * Cancels this transaction instead of completing it. That means that the state isn't 3784 * changed, so the pop results in no change to the state. 3785 */ 3786 public void cancelTransaction() { 3787 mRecord.mManager.completeExecute(mRecord, mIsBack, false, false); 3788 } 3789 } 3790} 3791