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 * 78 * @deprecated Use the <a href="{@docRoot}tools/extras/support-library.html">Support Library</a> 79 * {@link android.support.v4.app.FragmentManager} for consistent behavior across all devices 80 * and access to <a href="{@docRoot}topic/libraries/architecture/lifecycle.html">Lifecycle</a>. 81 */ 82@Deprecated 83public abstract class FragmentManager { 84 /** 85 * Representation of an entry on the fragment back stack, as created 86 * with {@link FragmentTransaction#addToBackStack(String) 87 * FragmentTransaction.addToBackStack()}. Entries can later be 88 * retrieved with {@link FragmentManager#getBackStackEntryAt(int) 89 * FragmentManager.getBackStackEntryAt()}. 90 * 91 * <p>Note that you should never hold on to a BackStackEntry object; 92 * the identifier as returned by {@link #getId} is the only thing that 93 * will be persisted across activity instances. 94 * 95 * @deprecated Use the <a href="{@docRoot}tools/extras/support-library.html"> 96 * Support Library</a> {@link android.support.v4.app.FragmentManager.BackStackEntry} 97 */ 98 @Deprecated 99 public interface BackStackEntry { 100 /** 101 * Return the unique identifier for the entry. This is the only 102 * representation of the entry that will persist across activity 103 * instances. 104 */ 105 public int getId(); 106 107 /** 108 * Get the name that was supplied to 109 * {@link FragmentTransaction#addToBackStack(String) 110 * FragmentTransaction.addToBackStack(String)} when creating this entry. 111 */ 112 public String getName(); 113 114 /** 115 * Return the full bread crumb title resource identifier for the entry, 116 * or 0 if it does not have one. 117 */ 118 public int getBreadCrumbTitleRes(); 119 120 /** 121 * Return the short bread crumb title resource identifier for the entry, 122 * or 0 if it does not have one. 123 */ 124 public int getBreadCrumbShortTitleRes(); 125 126 /** 127 * Return the full bread crumb title for the entry, or null if it 128 * does not have one. 129 */ 130 public CharSequence getBreadCrumbTitle(); 131 132 /** 133 * Return the short bread crumb title for the entry, or null if it 134 * does not have one. 135 */ 136 public CharSequence getBreadCrumbShortTitle(); 137 } 138 139 /** 140 * Interface to watch for changes to the back stack. 141 * 142 * @deprecated Use the <a href="{@docRoot}tools/extras/support-library.html"> 143 * Support Library</a> 144 * {@link android.support.v4.app.FragmentManager.OnBackStackChangedListener} 145 */ 146 @Deprecated 147 public interface OnBackStackChangedListener { 148 /** 149 * Called whenever the contents of the back stack change. 150 */ 151 public void onBackStackChanged(); 152 } 153 154 /** 155 * Start a series of edit operations on the Fragments associated with 156 * this FragmentManager. 157 * 158 * <p>Note: A fragment transaction can only be created/committed prior 159 * to an activity saving its state. If you try to commit a transaction 160 * after {@link Activity#onSaveInstanceState Activity.onSaveInstanceState()} 161 * (and prior to a following {@link Activity#onStart Activity.onStart} 162 * or {@link Activity#onResume Activity.onResume()}, you will get an error. 163 * This is because the framework takes care of saving your current fragments 164 * in the state, and if changes are made after the state is saved then they 165 * will be lost.</p> 166 */ 167 public abstract FragmentTransaction beginTransaction(); 168 169 /** @hide -- remove once prebuilts are in. */ 170 @Deprecated 171 public FragmentTransaction openTransaction() { 172 return beginTransaction(); 173 } 174 175 /** 176 * After a {@link FragmentTransaction} is committed with 177 * {@link FragmentTransaction#commit FragmentTransaction.commit()}, it 178 * is scheduled to be executed asynchronously on the process's main thread. 179 * If you want to immediately executing any such pending operations, you 180 * can call this function (only from the main thread) to do so. Note that 181 * all callbacks and other related behavior will be done from within this 182 * call, so be careful about where this is called from. 183 * <p> 184 * This also forces the start of any postponed Transactions where 185 * {@link Fragment#postponeEnterTransition()} has been called. 186 * 187 * @return Returns true if there were any pending transactions to be 188 * executed. 189 */ 190 public abstract boolean executePendingTransactions(); 191 192 /** 193 * Finds a fragment that was identified by the given id either when inflated 194 * from XML or as the container ID when added in a transaction. This first 195 * searches through fragments that are currently added to the manager's 196 * activity; if no such fragment is found, then all fragments currently 197 * on the back stack associated with this ID are searched. 198 * @return The fragment if found or null otherwise. 199 */ 200 public abstract Fragment findFragmentById(int id); 201 202 /** 203 * Finds a fragment that was identified by the given tag either when inflated 204 * from XML or as supplied when added in a transaction. This first 205 * searches through fragments that are currently added to the manager's 206 * activity; if no such fragment is found, then all fragments currently 207 * on the back stack are searched. 208 * @return The fragment if found or null otherwise. 209 */ 210 public abstract Fragment findFragmentByTag(String tag); 211 212 /** 213 * Flag for {@link #popBackStack(String, int)} 214 * and {@link #popBackStack(int, int)}: If set, and the name or ID of 215 * a back stack entry has been supplied, then all matching entries will 216 * be consumed until one that doesn't match is found or the bottom of 217 * the stack is reached. Otherwise, all entries up to but not including that entry 218 * will be removed. 219 */ 220 public static final int POP_BACK_STACK_INCLUSIVE = 1<<0; 221 222 /** 223 * Pop the top state off the back stack. This function is asynchronous -- it 224 * enqueues the request to pop, but the action will not be performed until the 225 * application returns to its event loop. 226 */ 227 public abstract void popBackStack(); 228 229 /** 230 * Like {@link #popBackStack()}, but performs the operation immediately 231 * inside of the call. This is like calling {@link #executePendingTransactions()} 232 * afterwards without forcing the start of postponed Transactions. 233 * @return Returns true if there was something popped, else false. 234 */ 235 public abstract boolean popBackStackImmediate(); 236 237 /** 238 * Pop the last fragment transition from the manager's fragment 239 * back stack. If there is nothing to pop, false is returned. 240 * This function is asynchronous -- it enqueues the 241 * request to pop, but the action will not be performed until the application 242 * returns to its event loop. 243 * 244 * @param name If non-null, this is the name of a previous back state 245 * to look for; if found, all states up to that state will be popped. The 246 * {@link #POP_BACK_STACK_INCLUSIVE} flag can be used to control whether 247 * the named state itself is popped. If null, only the top state is popped. 248 * @param flags Either 0 or {@link #POP_BACK_STACK_INCLUSIVE}. 249 */ 250 public abstract void popBackStack(String name, int flags); 251 252 /** 253 * Like {@link #popBackStack(String, int)}, but performs the operation immediately 254 * inside of the call. This is like calling {@link #executePendingTransactions()} 255 * afterwards without forcing the start of postponed Transactions. 256 * @return Returns true if there was something popped, else false. 257 */ 258 public abstract boolean popBackStackImmediate(String name, int flags); 259 260 /** 261 * Pop all back stack states up to the one with the given identifier. 262 * This function is asynchronous -- it enqueues the 263 * request to pop, but the action will not be performed until the application 264 * returns to its event loop. 265 * 266 * @param id Identifier of the stated to be popped. If no identifier exists, 267 * false is returned. 268 * The identifier is the number returned by 269 * {@link FragmentTransaction#commit() FragmentTransaction.commit()}. The 270 * {@link #POP_BACK_STACK_INCLUSIVE} flag can be used to control whether 271 * the named state itself is popped. 272 * @param flags Either 0 or {@link #POP_BACK_STACK_INCLUSIVE}. 273 */ 274 public abstract void popBackStack(int id, int flags); 275 276 /** 277 * Like {@link #popBackStack(int, int)}, but performs the operation immediately 278 * inside of the call. This is like calling {@link #executePendingTransactions()} 279 * afterwards without forcing the start of postponed Transactions. 280 * @return Returns true if there was something popped, else false. 281 */ 282 public abstract boolean popBackStackImmediate(int id, int flags); 283 284 /** 285 * Return the number of entries currently in the back stack. 286 */ 287 public abstract int getBackStackEntryCount(); 288 289 /** 290 * Return the BackStackEntry at index <var>index</var> in the back stack; 291 * where the item on the bottom of the stack has index 0. 292 */ 293 public abstract BackStackEntry getBackStackEntryAt(int index); 294 295 /** 296 * Add a new listener for changes to the fragment back stack. 297 */ 298 public abstract void addOnBackStackChangedListener(OnBackStackChangedListener listener); 299 300 /** 301 * Remove a listener that was previously added with 302 * {@link #addOnBackStackChangedListener(OnBackStackChangedListener)}. 303 */ 304 public abstract void removeOnBackStackChangedListener(OnBackStackChangedListener listener); 305 306 /** 307 * Put a reference to a fragment in a Bundle. This Bundle can be 308 * persisted as saved state, and when later restoring 309 * {@link #getFragment(Bundle, String)} will return the current 310 * instance of the same fragment. 311 * 312 * @param bundle The bundle in which to put the fragment reference. 313 * @param key The name of the entry in the bundle. 314 * @param fragment The Fragment whose reference is to be stored. 315 */ 316 public abstract void putFragment(Bundle bundle, String key, Fragment fragment); 317 318 /** 319 * Retrieve the current Fragment instance for a reference previously 320 * placed with {@link #putFragment(Bundle, String, Fragment)}. 321 * 322 * @param bundle The bundle from which to retrieve the fragment reference. 323 * @param key The name of the entry in the bundle. 324 * @return Returns the current Fragment instance that is associated with 325 * the given reference. 326 */ 327 public abstract Fragment getFragment(Bundle bundle, String key); 328 329 /** 330 * Get a list of all fragments that are currently added to the FragmentManager. 331 * This may include those that are hidden as well as those that are shown. 332 * This will not include any fragments only in the back stack, or fragments that 333 * are detached or removed. 334 * <p> 335 * The order of the fragments in the list is the order in which they were 336 * added or attached. 337 * 338 * @return A list of all fragments that are added to the FragmentManager. 339 */ 340 public abstract List<Fragment> getFragments(); 341 342 /** 343 * Save the current instance state of the given Fragment. This can be 344 * used later when creating a new instance of the Fragment and adding 345 * it to the fragment manager, to have it create itself to match the 346 * current state returned here. Note that there are limits on how 347 * this can be used: 348 * 349 * <ul> 350 * <li>The Fragment must currently be attached to the FragmentManager. 351 * <li>A new Fragment created using this saved state must be the same class 352 * type as the Fragment it was created from. 353 * <li>The saved state can not contain dependencies on other fragments -- 354 * that is it can't use {@link #putFragment(Bundle, String, Fragment)} to 355 * store a fragment reference because that reference may not be valid when 356 * this saved state is later used. Likewise the Fragment's target and 357 * result code are not included in this state. 358 * </ul> 359 * 360 * @param f The Fragment whose state is to be saved. 361 * @return The generated state. This will be null if there was no 362 * interesting state created by the fragment. 363 */ 364 public abstract Fragment.SavedState saveFragmentInstanceState(Fragment f); 365 366 /** 367 * Returns true if the final {@link Activity#onDestroy() Activity.onDestroy()} 368 * call has been made on the FragmentManager's Activity, so this instance is now dead. 369 */ 370 public abstract boolean isDestroyed(); 371 372 /** 373 * Registers a {@link FragmentLifecycleCallbacks} to listen to fragment lifecycle events 374 * happening in this FragmentManager. All registered callbacks will be automatically 375 * unregistered when this FragmentManager is destroyed. 376 * 377 * @param cb Callbacks to register 378 * @param recursive true to automatically register this callback for all child FragmentManagers 379 */ 380 public abstract void registerFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb, 381 boolean recursive); 382 383 /** 384 * Unregisters a previously registered {@link FragmentLifecycleCallbacks}. If the callback 385 * was not previously registered this call has no effect. All registered callbacks will be 386 * automatically unregistered when this FragmentManager is destroyed. 387 * 388 * @param cb Callbacks to unregister 389 */ 390 public abstract void unregisterFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb); 391 392 /** 393 * Return the currently active primary navigation fragment for this FragmentManager. 394 * 395 * <p>The primary navigation fragment's 396 * {@link Fragment#getChildFragmentManager() child FragmentManager} will be called first 397 * to process delegated navigation actions such as {@link #popBackStack()} if no ID 398 * or transaction name is provided to pop to.</p> 399 * 400 * @return the fragment designated as the primary navigation fragment 401 */ 402 public abstract Fragment getPrimaryNavigationFragment(); 403 404 /** 405 * Print the FragmentManager's state into the given stream. 406 * 407 * @param prefix Text to print at the front of each line. 408 * @param fd The raw file descriptor that the dump is being sent to. 409 * @param writer A PrintWriter to which the dump is to be set. 410 * @param args Additional arguments to the dump request. 411 */ 412 public abstract void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args); 413 414 /** 415 * Control whether the framework's internal fragment manager debugging 416 * logs are turned on. If enabled, you will see output in logcat as 417 * the framework performs fragment operations. 418 */ 419 public static void enableDebugLogging(boolean enabled) { 420 FragmentManagerImpl.DEBUG = enabled; 421 } 422 423 /** 424 * Invalidate the attached activity's options menu as necessary. 425 * This may end up being deferred until we move to the resumed state. 426 */ 427 public void invalidateOptionsMenu() { } 428 429 /** 430 * Returns {@code true} if the FragmentManager's state has already been saved 431 * by its host. Any operations that would change saved state should not be performed 432 * if this method returns true. For example, any popBackStack() method, such as 433 * {@link #popBackStackImmediate()} or any FragmentTransaction using 434 * {@link FragmentTransaction#commit()} instead of 435 * {@link FragmentTransaction#commitAllowingStateLoss()} will change 436 * the state and will result in an error. 437 * 438 * @return true if this FragmentManager's state has already been saved by its host 439 */ 440 public abstract boolean isStateSaved(); 441 442 /** 443 * Callback interface for listening to fragment state changes that happen 444 * within a given FragmentManager. 445 * 446 * @deprecated Use the <a href="{@docRoot}tools/extras/support-library.html"> 447 * Support Library</a> 448 * {@link android.support.v4.app.FragmentManager.FragmentLifecycleCallbacks} 449 */ 450 @Deprecated 451 public abstract static class FragmentLifecycleCallbacks { 452 /** 453 * Called right before the fragment's {@link Fragment#onAttach(Context)} method is called. 454 * This is a good time to inject any required dependencies for the fragment before any of 455 * the fragment's lifecycle methods are invoked. 456 * 457 * @param fm Host FragmentManager 458 * @param f Fragment changing state 459 * @param context Context that the Fragment is being attached to 460 */ 461 public void onFragmentPreAttached(FragmentManager fm, Fragment f, Context context) {} 462 463 /** 464 * Called after the fragment has been attached to its host. Its host will have had 465 * <code>onAttachFragment</code> called before this call happens. 466 * 467 * @param fm Host FragmentManager 468 * @param f Fragment changing state 469 * @param context Context that the Fragment was attached to 470 */ 471 public void onFragmentAttached(FragmentManager fm, Fragment f, Context context) {} 472 473 /** 474 * Called right before the fragment's {@link Fragment#onCreate(Bundle)} method is called. 475 * This is a good time to inject any required dependencies or perform other configuration 476 * for the fragment. 477 * 478 * @param fm Host FragmentManager 479 * @param f Fragment changing state 480 * @param savedInstanceState Saved instance bundle from a previous instance 481 */ 482 public void onFragmentPreCreated(FragmentManager fm, Fragment f, 483 Bundle savedInstanceState) {} 484 485 /** 486 * Called after the fragment has returned from the FragmentManager's call to 487 * {@link Fragment#onCreate(Bundle)}. This will only happen once for any given 488 * fragment instance, though the fragment may be attached and detached multiple times. 489 * 490 * @param fm Host FragmentManager 491 * @param f Fragment changing state 492 * @param savedInstanceState Saved instance bundle from a previous instance 493 */ 494 public void onFragmentCreated(FragmentManager fm, Fragment f, Bundle savedInstanceState) {} 495 496 /** 497 * Called after the fragment has returned from the FragmentManager's call to 498 * {@link Fragment#onActivityCreated(Bundle)}. This will only happen once for any given 499 * fragment instance, though the fragment may be attached and detached multiple times. 500 * 501 * @param fm Host FragmentManager 502 * @param f Fragment changing state 503 * @param savedInstanceState Saved instance bundle from a previous instance 504 */ 505 public void onFragmentActivityCreated(FragmentManager fm, Fragment f, 506 Bundle savedInstanceState) {} 507 508 /** 509 * Called after the fragment has returned a non-null view from the FragmentManager's 510 * request to {@link Fragment#onCreateView(LayoutInflater, ViewGroup, Bundle)}. 511 * 512 * @param fm Host FragmentManager 513 * @param f Fragment that created and owns the view 514 * @param v View returned by the fragment 515 * @param savedInstanceState Saved instance bundle from a previous instance 516 */ 517 public void onFragmentViewCreated(FragmentManager fm, Fragment f, View v, 518 Bundle savedInstanceState) {} 519 520 /** 521 * Called after the fragment has returned from the FragmentManager's call to 522 * {@link Fragment#onStart()}. 523 * 524 * @param fm Host FragmentManager 525 * @param f Fragment changing state 526 */ 527 public void onFragmentStarted(FragmentManager fm, Fragment f) {} 528 529 /** 530 * Called after the fragment has returned from the FragmentManager's call to 531 * {@link Fragment#onResume()}. 532 * 533 * @param fm Host FragmentManager 534 * @param f Fragment changing state 535 */ 536 public void onFragmentResumed(FragmentManager fm, Fragment f) {} 537 538 /** 539 * Called after the fragment has returned from the FragmentManager's call to 540 * {@link Fragment#onPause()}. 541 * 542 * @param fm Host FragmentManager 543 * @param f Fragment changing state 544 */ 545 public void onFragmentPaused(FragmentManager fm, Fragment f) {} 546 547 /** 548 * Called after the fragment has returned from the FragmentManager's call to 549 * {@link Fragment#onStop()}. 550 * 551 * @param fm Host FragmentManager 552 * @param f Fragment changing state 553 */ 554 public void onFragmentStopped(FragmentManager fm, Fragment f) {} 555 556 /** 557 * Called after the fragment has returned from the FragmentManager's call to 558 * {@link Fragment#onSaveInstanceState(Bundle)}. 559 * 560 * @param fm Host FragmentManager 561 * @param f Fragment changing state 562 * @param outState Saved state bundle for the fragment 563 */ 564 public void onFragmentSaveInstanceState(FragmentManager fm, Fragment f, Bundle outState) {} 565 566 /** 567 * Called after the fragment has returned from the FragmentManager's call to 568 * {@link Fragment#onDestroyView()}. 569 * 570 * @param fm Host FragmentManager 571 * @param f Fragment changing state 572 */ 573 public void onFragmentViewDestroyed(FragmentManager fm, Fragment f) {} 574 575 /** 576 * Called after the fragment has returned from the FragmentManager's call to 577 * {@link Fragment#onDestroy()}. 578 * 579 * @param fm Host FragmentManager 580 * @param f Fragment changing state 581 */ 582 public void onFragmentDestroyed(FragmentManager fm, Fragment f) {} 583 584 /** 585 * Called after the fragment has returned from the FragmentManager's call to 586 * {@link Fragment#onDetach()}. 587 * 588 * @param fm Host FragmentManager 589 * @param f Fragment changing state 590 */ 591 public void onFragmentDetached(FragmentManager fm, Fragment f) {} 592 } 593} 594 595final class FragmentManagerState implements Parcelable { 596 FragmentState[] mActive; 597 int[] mAdded; 598 BackStackState[] mBackStack; 599 int mPrimaryNavActiveIndex = -1; 600 int mNextFragmentIndex; 601 602 public FragmentManagerState() { 603 } 604 605 public FragmentManagerState(Parcel in) { 606 mActive = in.createTypedArray(FragmentState.CREATOR); 607 mAdded = in.createIntArray(); 608 mBackStack = in.createTypedArray(BackStackState.CREATOR); 609 mPrimaryNavActiveIndex = in.readInt(); 610 mNextFragmentIndex = in.readInt(); 611 } 612 613 public int describeContents() { 614 return 0; 615 } 616 617 public void writeToParcel(Parcel dest, int flags) { 618 dest.writeTypedArray(mActive, flags); 619 dest.writeIntArray(mAdded); 620 dest.writeTypedArray(mBackStack, flags); 621 dest.writeInt(mPrimaryNavActiveIndex); 622 dest.writeInt(mNextFragmentIndex); 623 } 624 625 public static final Parcelable.Creator<FragmentManagerState> CREATOR 626 = new Parcelable.Creator<FragmentManagerState>() { 627 public FragmentManagerState createFromParcel(Parcel in) { 628 return new FragmentManagerState(in); 629 } 630 631 public FragmentManagerState[] newArray(int size) { 632 return new FragmentManagerState[size]; 633 } 634 }; 635} 636 637/** 638 * Container for fragments associated with an activity. 639 */ 640final class FragmentManagerImpl extends FragmentManager implements LayoutInflater.Factory2 { 641 static boolean DEBUG = false; 642 static final String TAG = "FragmentManager"; 643 644 static final String TARGET_REQUEST_CODE_STATE_TAG = "android:target_req_state"; 645 static final String TARGET_STATE_TAG = "android:target_state"; 646 static final String VIEW_STATE_TAG = "android:view_state"; 647 static final String USER_VISIBLE_HINT_TAG = "android:user_visible_hint"; 648 649 static class AnimateOnHWLayerIfNeededListener implements Animator.AnimatorListener { 650 private boolean mShouldRunOnHWLayer = false; 651 private View mView; 652 public AnimateOnHWLayerIfNeededListener(final View v) { 653 if (v == null) { 654 return; 655 } 656 mView = v; 657 } 658 659 @Override 660 public void onAnimationStart(Animator animation) { 661 mShouldRunOnHWLayer = shouldRunOnHWLayer(mView, animation); 662 if (mShouldRunOnHWLayer) { 663 mView.setLayerType(View.LAYER_TYPE_HARDWARE, null); 664 } 665 } 666 667 @Override 668 public void onAnimationEnd(Animator animation) { 669 if (mShouldRunOnHWLayer) { 670 mView.setLayerType(View.LAYER_TYPE_NONE, null); 671 } 672 mView = null; 673 animation.removeListener(this); 674 } 675 676 @Override 677 public void onAnimationCancel(Animator animation) { 678 679 } 680 681 @Override 682 public void onAnimationRepeat(Animator animation) { 683 684 } 685 } 686 687 ArrayList<OpGenerator> mPendingActions; 688 boolean mExecutingActions; 689 690 int mNextFragmentIndex = 0; 691 SparseArray<Fragment> mActive; 692 final ArrayList<Fragment> mAdded = new ArrayList<>(); 693 ArrayList<BackStackRecord> mBackStack; 694 ArrayList<Fragment> mCreatedMenus; 695 696 // Must be accessed while locked. 697 ArrayList<BackStackRecord> mBackStackIndices; 698 ArrayList<Integer> mAvailBackStackIndices; 699 700 ArrayList<OnBackStackChangedListener> mBackStackChangeListeners; 701 final CopyOnWriteArrayList<Pair<FragmentLifecycleCallbacks, Boolean>> 702 mLifecycleCallbacks = new CopyOnWriteArrayList<>(); 703 704 int mCurState = Fragment.INITIALIZING; 705 FragmentHostCallback<?> mHost; 706 FragmentContainer mContainer; 707 Fragment mParent; 708 Fragment mPrimaryNav; 709 710 boolean mNeedMenuInvalidate; 711 boolean mStateSaved; 712 boolean mDestroyed; 713 String mNoTransactionsBecause; 714 boolean mHavePendingDeferredStart; 715 716 // Temporary vars for removing redundant operations in BackStackRecords: 717 ArrayList<BackStackRecord> mTmpRecords; 718 ArrayList<Boolean> mTmpIsPop; 719 ArrayList<Fragment> mTmpAddedFragments; 720 721 // Temporary vars for state save and restore. 722 Bundle mStateBundle = null; 723 SparseArray<Parcelable> mStateArray = null; 724 725 // Postponed transactions. 726 ArrayList<StartEnterTransitionListener> mPostponedTransactions; 727 728 // Prior to O, we allowed executing transactions during fragment manager state changes. 729 // This is dangerous, but we want to keep from breaking old applications. 730 boolean mAllowOldReentrantBehavior; 731 732 // Saved FragmentManagerNonConfig during saveAllState() and cleared in noteStateNotSaved() 733 FragmentManagerNonConfig mSavedNonConfig; 734 735 Runnable mExecCommit = new Runnable() { 736 @Override 737 public void run() { 738 execPendingActions(); 739 } 740 }; 741 742 private void throwException(RuntimeException ex) { 743 Log.e(TAG, ex.getMessage()); 744 LogWriter logw = new LogWriter(Log.ERROR, TAG); 745 PrintWriter pw = new FastPrintWriter(logw, false, 1024); 746 if (mHost != null) { 747 Log.e(TAG, "Activity state:"); 748 try { 749 mHost.onDump(" ", null, pw, new String[] { }); 750 } catch (Exception e) { 751 pw.flush(); 752 Log.e(TAG, "Failed dumping state", e); 753 } 754 } else { 755 Log.e(TAG, "Fragment manager state:"); 756 try { 757 dump(" ", null, pw, new String[] { }); 758 } catch (Exception e) { 759 pw.flush(); 760 Log.e(TAG, "Failed dumping state", e); 761 } 762 } 763 pw.flush(); 764 throw ex; 765 } 766 767 static boolean modifiesAlpha(Animator anim) { 768 if (anim == null) { 769 return false; 770 } 771 if (anim instanceof ValueAnimator) { 772 ValueAnimator valueAnim = (ValueAnimator) anim; 773 PropertyValuesHolder[] values = valueAnim.getValues(); 774 for (int i = 0; i < values.length; i++) { 775 if (("alpha").equals(values[i].getPropertyName())) { 776 return true; 777 } 778 } 779 } else if (anim instanceof AnimatorSet) { 780 List<Animator> animList = ((AnimatorSet) anim).getChildAnimations(); 781 for (int i = 0; i < animList.size(); i++) { 782 if (modifiesAlpha(animList.get(i))) { 783 return true; 784 } 785 } 786 } 787 return false; 788 } 789 790 static boolean shouldRunOnHWLayer(View v, Animator anim) { 791 if (v == null || anim == null) { 792 return false; 793 } 794 return v.getLayerType() == View.LAYER_TYPE_NONE 795 && v.hasOverlappingRendering() 796 && modifiesAlpha(anim); 797 } 798 799 /** 800 * Sets the to be animated view on hardware layer during the animation. 801 */ 802 private void setHWLayerAnimListenerIfAlpha(final View v, Animator anim) { 803 if (v == null || anim == null) { 804 return; 805 } 806 if (shouldRunOnHWLayer(v, anim)) { 807 anim.addListener(new AnimateOnHWLayerIfNeededListener(v)); 808 } 809 } 810 811 @Override 812 public FragmentTransaction beginTransaction() { 813 return new BackStackRecord(this); 814 } 815 816 @Override 817 public boolean executePendingTransactions() { 818 boolean updates = execPendingActions(); 819 forcePostponedTransactions(); 820 return updates; 821 } 822 823 @Override 824 public void popBackStack() { 825 enqueueAction(new PopBackStackState(null, -1, 0), false); 826 } 827 828 @Override 829 public boolean popBackStackImmediate() { 830 checkStateLoss(); 831 return popBackStackImmediate(null, -1, 0); 832 } 833 834 @Override 835 public void popBackStack(String name, int flags) { 836 enqueueAction(new PopBackStackState(name, -1, flags), false); 837 } 838 839 @Override 840 public boolean popBackStackImmediate(String name, int flags) { 841 checkStateLoss(); 842 return popBackStackImmediate(name, -1, flags); 843 } 844 845 @Override 846 public void popBackStack(int id, int flags) { 847 if (id < 0) { 848 throw new IllegalArgumentException("Bad id: " + id); 849 } 850 enqueueAction(new PopBackStackState(null, id, flags), false); 851 } 852 853 @Override 854 public boolean popBackStackImmediate(int id, int flags) { 855 checkStateLoss(); 856 if (id < 0) { 857 throw new IllegalArgumentException("Bad id: " + id); 858 } 859 return popBackStackImmediate(null, id, flags); 860 } 861 862 /** 863 * Used by all public popBackStackImmediate methods, this executes pending transactions and 864 * returns true if the pop action did anything, regardless of what other pending 865 * transactions did. 866 * 867 * @return true if the pop operation did anything or false otherwise. 868 */ 869 private boolean popBackStackImmediate(String name, int id, int flags) { 870 execPendingActions(); 871 ensureExecReady(true); 872 873 if (mPrimaryNav != null // We have a primary nav fragment 874 && id < 0 // No valid id (since they're local) 875 && name == null) { // no name to pop to (since they're local) 876 final FragmentManager childManager = mPrimaryNav.mChildFragmentManager; 877 if (childManager != null && childManager.popBackStackImmediate()) { 878 // We did something, just not to this specific FragmentManager. Return true. 879 return true; 880 } 881 } 882 883 boolean executePop = popBackStackState(mTmpRecords, mTmpIsPop, name, id, flags); 884 if (executePop) { 885 mExecutingActions = true; 886 try { 887 removeRedundantOperationsAndExecute(mTmpRecords, mTmpIsPop); 888 } finally { 889 cleanupExec(); 890 } 891 } 892 893 doPendingDeferredStart(); 894 burpActive(); 895 return executePop; 896 } 897 898 @Override 899 public int getBackStackEntryCount() { 900 return mBackStack != null ? mBackStack.size() : 0; 901 } 902 903 @Override 904 public BackStackEntry getBackStackEntryAt(int index) { 905 return mBackStack.get(index); 906 } 907 908 @Override 909 public void addOnBackStackChangedListener(OnBackStackChangedListener listener) { 910 if (mBackStackChangeListeners == null) { 911 mBackStackChangeListeners = new ArrayList<OnBackStackChangedListener>(); 912 } 913 mBackStackChangeListeners.add(listener); 914 } 915 916 @Override 917 public void removeOnBackStackChangedListener(OnBackStackChangedListener listener) { 918 if (mBackStackChangeListeners != null) { 919 mBackStackChangeListeners.remove(listener); 920 } 921 } 922 923 @Override 924 public void putFragment(Bundle bundle, String key, Fragment fragment) { 925 if (fragment.mIndex < 0) { 926 throwException(new IllegalStateException("Fragment " + fragment 927 + " is not currently in the FragmentManager")); 928 } 929 bundle.putInt(key, fragment.mIndex); 930 } 931 932 @Override 933 public Fragment getFragment(Bundle bundle, String key) { 934 int index = bundle.getInt(key, -1); 935 if (index == -1) { 936 return null; 937 } 938 Fragment f = mActive.get(index); 939 if (f == null) { 940 throwException(new IllegalStateException("Fragment no longer exists for key " 941 + key + ": index " + index)); 942 } 943 return f; 944 } 945 946 @Override 947 public List<Fragment> getFragments() { 948 if (mAdded.isEmpty()) { 949 return Collections.EMPTY_LIST; 950 } 951 synchronized (mAdded) { 952 return (List<Fragment>) mAdded.clone(); 953 } 954 } 955 956 @Override 957 public Fragment.SavedState saveFragmentInstanceState(Fragment fragment) { 958 if (fragment.mIndex < 0) { 959 throwException(new IllegalStateException("Fragment " + fragment 960 + " is not currently in the FragmentManager")); 961 } 962 if (fragment.mState > Fragment.INITIALIZING) { 963 Bundle result = saveFragmentBasicState(fragment); 964 return result != null ? new Fragment.SavedState(result) : null; 965 } 966 return null; 967 } 968 969 @Override 970 public boolean isDestroyed() { 971 return mDestroyed; 972 } 973 974 @Override 975 public String toString() { 976 StringBuilder sb = new StringBuilder(128); 977 sb.append("FragmentManager{"); 978 sb.append(Integer.toHexString(System.identityHashCode(this))); 979 sb.append(" in "); 980 if (mParent != null) { 981 DebugUtils.buildShortClassTag(mParent, sb); 982 } else { 983 DebugUtils.buildShortClassTag(mHost, sb); 984 } 985 sb.append("}}"); 986 return sb.toString(); 987 } 988 989 @Override 990 public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) { 991 String innerPrefix = prefix + " "; 992 993 int N; 994 if (mActive != null) { 995 N = mActive.size(); 996 if (N > 0) { 997 writer.print(prefix); writer.print("Active Fragments in "); 998 writer.print(Integer.toHexString(System.identityHashCode(this))); 999 writer.println(":"); 1000 for (int i=0; i<N; i++) { 1001 Fragment f = mActive.valueAt(i); 1002 writer.print(prefix); writer.print(" #"); writer.print(i); 1003 writer.print(": "); writer.println(f); 1004 if (f != null) { 1005 f.dump(innerPrefix, fd, writer, args); 1006 } 1007 } 1008 } 1009 } 1010 1011 N = mAdded.size(); 1012 if (N > 0) { 1013 writer.print(prefix); 1014 writer.println("Added Fragments:"); 1015 for (int i = 0; i < N; i++) { 1016 Fragment f = mAdded.get(i); 1017 writer.print(prefix); 1018 writer.print(" #"); 1019 writer.print(i); 1020 writer.print(": "); 1021 writer.println(f.toString()); 1022 } 1023 } 1024 1025 if (mCreatedMenus != null) { 1026 N = mCreatedMenus.size(); 1027 if (N > 0) { 1028 writer.print(prefix); writer.println("Fragments Created Menus:"); 1029 for (int i=0; i<N; i++) { 1030 Fragment f = mCreatedMenus.get(i); 1031 writer.print(prefix); writer.print(" #"); writer.print(i); 1032 writer.print(": "); writer.println(f.toString()); 1033 } 1034 } 1035 } 1036 1037 if (mBackStack != null) { 1038 N = mBackStack.size(); 1039 if (N > 0) { 1040 writer.print(prefix); writer.println("Back Stack:"); 1041 for (int i=0; i<N; i++) { 1042 BackStackRecord bs = mBackStack.get(i); 1043 writer.print(prefix); writer.print(" #"); writer.print(i); 1044 writer.print(": "); writer.println(bs.toString()); 1045 bs.dump(innerPrefix, fd, writer, args); 1046 } 1047 } 1048 } 1049 1050 synchronized (this) { 1051 if (mBackStackIndices != null) { 1052 N = mBackStackIndices.size(); 1053 if (N > 0) { 1054 writer.print(prefix); writer.println("Back Stack Indices:"); 1055 for (int i=0; i<N; i++) { 1056 BackStackRecord bs = mBackStackIndices.get(i); 1057 writer.print(prefix); writer.print(" #"); writer.print(i); 1058 writer.print(": "); writer.println(bs); 1059 } 1060 } 1061 } 1062 1063 if (mAvailBackStackIndices != null && mAvailBackStackIndices.size() > 0) { 1064 writer.print(prefix); writer.print("mAvailBackStackIndices: "); 1065 writer.println(Arrays.toString(mAvailBackStackIndices.toArray())); 1066 } 1067 } 1068 1069 if (mPendingActions != null) { 1070 N = mPendingActions.size(); 1071 if (N > 0) { 1072 writer.print(prefix); writer.println("Pending Actions:"); 1073 for (int i=0; i<N; i++) { 1074 OpGenerator r = mPendingActions.get(i); 1075 writer.print(prefix); writer.print(" #"); writer.print(i); 1076 writer.print(": "); writer.println(r); 1077 } 1078 } 1079 } 1080 1081 writer.print(prefix); writer.println("FragmentManager misc state:"); 1082 writer.print(prefix); writer.print(" mHost="); writer.println(mHost); 1083 writer.print(prefix); writer.print(" mContainer="); writer.println(mContainer); 1084 if (mParent != null) { 1085 writer.print(prefix); writer.print(" mParent="); writer.println(mParent); 1086 } 1087 writer.print(prefix); writer.print(" mCurState="); writer.print(mCurState); 1088 writer.print(" mStateSaved="); writer.print(mStateSaved); 1089 writer.print(" mDestroyed="); writer.println(mDestroyed); 1090 if (mNeedMenuInvalidate) { 1091 writer.print(prefix); writer.print(" mNeedMenuInvalidate="); 1092 writer.println(mNeedMenuInvalidate); 1093 } 1094 if (mNoTransactionsBecause != null) { 1095 writer.print(prefix); writer.print(" mNoTransactionsBecause="); 1096 writer.println(mNoTransactionsBecause); 1097 } 1098 } 1099 1100 Animator loadAnimator(Fragment fragment, int transit, boolean enter, 1101 int transitionStyle) { 1102 Animator animObj = fragment.onCreateAnimator(transit, enter, fragment.getNextAnim()); 1103 if (animObj != null) { 1104 return animObj; 1105 } 1106 1107 if (fragment.getNextAnim() != 0) { 1108 Animator anim = AnimatorInflater.loadAnimator(mHost.getContext(), 1109 fragment.getNextAnim()); 1110 if (anim != null) { 1111 return anim; 1112 } 1113 } 1114 1115 if (transit == 0) { 1116 return null; 1117 } 1118 1119 int styleIndex = transitToStyleIndex(transit, enter); 1120 if (styleIndex < 0) { 1121 return null; 1122 } 1123 1124 if (transitionStyle == 0 && mHost.onHasWindowAnimations()) { 1125 transitionStyle = mHost.onGetWindowAnimations(); 1126 } 1127 if (transitionStyle == 0) { 1128 return null; 1129 } 1130 1131 TypedArray attrs = mHost.getContext().obtainStyledAttributes(transitionStyle, 1132 com.android.internal.R.styleable.FragmentAnimation); 1133 int anim = attrs.getResourceId(styleIndex, 0); 1134 attrs.recycle(); 1135 1136 if (anim == 0) { 1137 return null; 1138 } 1139 1140 return AnimatorInflater.loadAnimator(mHost.getContext(), anim); 1141 } 1142 1143 public void performPendingDeferredStart(Fragment f) { 1144 if (f.mDeferStart) { 1145 if (mExecutingActions) { 1146 // Wait until we're done executing our pending transactions 1147 mHavePendingDeferredStart = true; 1148 return; 1149 } 1150 f.mDeferStart = false; 1151 moveToState(f, mCurState, 0, 0, false); 1152 } 1153 } 1154 1155 boolean isStateAtLeast(int state) { 1156 return mCurState >= state; 1157 } 1158 1159 @SuppressWarnings("ReferenceEquality") 1160 void moveToState(Fragment f, int newState, int transit, int transitionStyle, 1161 boolean keepActive) { 1162 if (DEBUG && false) Log.v(TAG, "moveToState: " + f 1163 + " oldState=" + f.mState + " newState=" + newState 1164 + " mRemoving=" + f.mRemoving + " Callers=" + Debug.getCallers(5)); 1165 1166 // Fragments that are not currently added will sit in the onCreate() state. 1167 if ((!f.mAdded || f.mDetached) && newState > Fragment.CREATED) { 1168 newState = Fragment.CREATED; 1169 } 1170 if (f.mRemoving && newState > f.mState) { 1171 if (f.mState == Fragment.INITIALIZING && f.isInBackStack()) { 1172 // Allow the fragment to be created so that it can be saved later. 1173 newState = Fragment.CREATED; 1174 } else { 1175 // While removing a fragment, we can't change it to a higher state. 1176 newState = f.mState; 1177 } 1178 } 1179 // Defer start if requested; don't allow it to move to STARTED or higher 1180 // if it's not already started. 1181 if (f.mDeferStart && f.mState < Fragment.STARTED && newState > Fragment.STOPPED) { 1182 newState = Fragment.STOPPED; 1183 } 1184 if (f.mState <= newState) { 1185 // For fragments that are created from a layout, when restoring from 1186 // state we don't want to allow them to be created until they are 1187 // being reloaded from the layout. 1188 if (f.mFromLayout && !f.mInLayout) { 1189 return; 1190 } 1191 if (f.getAnimatingAway() != null) { 1192 // The fragment is currently being animated... but! Now we 1193 // want to move our state back up. Give up on waiting for the 1194 // animation, move to whatever the final state should be once 1195 // the animation is done, and then we can proceed from there. 1196 f.setAnimatingAway(null); 1197 moveToState(f, f.getStateAfterAnimating(), 0, 0, true); 1198 } 1199 switch (f.mState) { 1200 case Fragment.INITIALIZING: 1201 if (newState > Fragment.INITIALIZING) { 1202 if (DEBUG) Log.v(TAG, "moveto CREATED: " + f); 1203 if (f.mSavedFragmentState != null) { 1204 f.mSavedViewState = f.mSavedFragmentState.getSparseParcelableArray( 1205 FragmentManagerImpl.VIEW_STATE_TAG); 1206 f.mTarget = getFragment(f.mSavedFragmentState, 1207 FragmentManagerImpl.TARGET_STATE_TAG); 1208 if (f.mTarget != null) { 1209 f.mTargetRequestCode = f.mSavedFragmentState.getInt( 1210 FragmentManagerImpl.TARGET_REQUEST_CODE_STATE_TAG, 0); 1211 } 1212 f.mUserVisibleHint = f.mSavedFragmentState.getBoolean( 1213 FragmentManagerImpl.USER_VISIBLE_HINT_TAG, true); 1214 if (!f.mUserVisibleHint) { 1215 f.mDeferStart = true; 1216 if (newState > Fragment.STOPPED) { 1217 newState = Fragment.STOPPED; 1218 } 1219 } 1220 } 1221 1222 f.mHost = mHost; 1223 f.mParentFragment = mParent; 1224 f.mFragmentManager = mParent != null 1225 ? mParent.mChildFragmentManager : mHost.getFragmentManagerImpl(); 1226 1227 // If we have a target fragment, push it along to at least CREATED 1228 // so that this one can rely on it as an initialized dependency. 1229 if (f.mTarget != null) { 1230 if (mActive.get(f.mTarget.mIndex) != f.mTarget) { 1231 throw new IllegalStateException("Fragment " + f 1232 + " declared target fragment " + f.mTarget 1233 + " that does not belong to this FragmentManager!"); 1234 } 1235 if (f.mTarget.mState < Fragment.CREATED) { 1236 moveToState(f.mTarget, Fragment.CREATED, 0, 0, true); 1237 } 1238 } 1239 1240 dispatchOnFragmentPreAttached(f, mHost.getContext(), false); 1241 f.mCalled = false; 1242 f.onAttach(mHost.getContext()); 1243 if (!f.mCalled) { 1244 throw new SuperNotCalledException("Fragment " + f 1245 + " did not call through to super.onAttach()"); 1246 } 1247 if (f.mParentFragment == null) { 1248 mHost.onAttachFragment(f); 1249 } else { 1250 f.mParentFragment.onAttachFragment(f); 1251 } 1252 dispatchOnFragmentAttached(f, mHost.getContext(), false); 1253 1254 if (!f.mIsCreated) { 1255 dispatchOnFragmentPreCreated(f, f.mSavedFragmentState, false); 1256 f.performCreate(f.mSavedFragmentState); 1257 dispatchOnFragmentCreated(f, f.mSavedFragmentState, false); 1258 } else { 1259 f.restoreChildFragmentState(f.mSavedFragmentState, true); 1260 f.mState = Fragment.CREATED; 1261 } 1262 f.mRetaining = false; 1263 } 1264 // fall through 1265 case Fragment.CREATED: 1266 // This is outside the if statement below on purpose; we want this to run 1267 // even if we do a moveToState from CREATED => *, CREATED => CREATED, and 1268 // * => CREATED as part of the case fallthrough above. 1269 ensureInflatedFragmentView(f); 1270 1271 if (newState > Fragment.CREATED) { 1272 if (DEBUG) Log.v(TAG, "moveto ACTIVITY_CREATED: " + f); 1273 if (!f.mFromLayout) { 1274 ViewGroup container = null; 1275 if (f.mContainerId != 0) { 1276 if (f.mContainerId == View.NO_ID) { 1277 throwException(new IllegalArgumentException( 1278 "Cannot create fragment " 1279 + f 1280 + " for a container view with no id")); 1281 } 1282 container = mContainer.onFindViewById(f.mContainerId); 1283 if (container == null && !f.mRestored) { 1284 String resName; 1285 try { 1286 resName = f.getResources().getResourceName(f.mContainerId); 1287 } catch (NotFoundException e) { 1288 resName = "unknown"; 1289 } 1290 throwException(new IllegalArgumentException( 1291 "No view found for id 0x" 1292 + Integer.toHexString(f.mContainerId) + " (" 1293 + resName 1294 + ") for fragment " + f)); 1295 } 1296 } 1297 f.mContainer = container; 1298 f.mView = f.performCreateView(f.performGetLayoutInflater( 1299 f.mSavedFragmentState), container, f.mSavedFragmentState); 1300 if (f.mView != null) { 1301 f.mView.setSaveFromParentEnabled(false); 1302 if (container != null) { 1303 container.addView(f.mView); 1304 } 1305 if (f.mHidden) { 1306 f.mView.setVisibility(View.GONE); 1307 } 1308 f.onViewCreated(f.mView, f.mSavedFragmentState); 1309 dispatchOnFragmentViewCreated(f, f.mView, f.mSavedFragmentState, 1310 false); 1311 // Only animate the view if it is visible. This is done after 1312 // dispatchOnFragmentViewCreated in case visibility is changed 1313 f.mIsNewlyAdded = (f.mView.getVisibility() == View.VISIBLE) 1314 && f.mContainer != null; 1315 } 1316 } 1317 1318 f.performActivityCreated(f.mSavedFragmentState); 1319 dispatchOnFragmentActivityCreated(f, f.mSavedFragmentState, false); 1320 if (f.mView != null) { 1321 f.restoreViewState(f.mSavedFragmentState); 1322 } 1323 f.mSavedFragmentState = null; 1324 } 1325 // fall through 1326 case Fragment.ACTIVITY_CREATED: 1327 if (newState > Fragment.ACTIVITY_CREATED) { 1328 f.mState = Fragment.STOPPED; 1329 } 1330 // fall through 1331 case Fragment.STOPPED: 1332 if (newState > Fragment.STOPPED) { 1333 if (DEBUG) Log.v(TAG, "moveto STARTED: " + f); 1334 f.performStart(); 1335 dispatchOnFragmentStarted(f, false); 1336 } 1337 // fall through 1338 case Fragment.STARTED: 1339 if (newState > Fragment.STARTED) { 1340 if (DEBUG) Log.v(TAG, "moveto RESUMED: " + f); 1341 f.performResume(); 1342 dispatchOnFragmentResumed(f, false); 1343 // Get rid of this in case we saved it and never needed it. 1344 f.mSavedFragmentState = null; 1345 f.mSavedViewState = null; 1346 } 1347 } 1348 } else if (f.mState > newState) { 1349 switch (f.mState) { 1350 case Fragment.RESUMED: 1351 if (newState < Fragment.RESUMED) { 1352 if (DEBUG) Log.v(TAG, "movefrom RESUMED: " + f); 1353 f.performPause(); 1354 dispatchOnFragmentPaused(f, false); 1355 } 1356 // fall through 1357 case Fragment.STARTED: 1358 if (newState < Fragment.STARTED) { 1359 if (DEBUG) Log.v(TAG, "movefrom STARTED: " + f); 1360 f.performStop(); 1361 dispatchOnFragmentStopped(f, false); 1362 } 1363 // fall through 1364 case Fragment.STOPPED: 1365 case Fragment.ACTIVITY_CREATED: 1366 if (newState < Fragment.ACTIVITY_CREATED) { 1367 if (DEBUG) Log.v(TAG, "movefrom ACTIVITY_CREATED: " + f); 1368 if (f.mView != null) { 1369 // Need to save the current view state if not 1370 // done already. 1371 if (mHost.onShouldSaveFragmentState(f) && f.mSavedViewState == null) { 1372 saveFragmentViewState(f); 1373 } 1374 } 1375 f.performDestroyView(); 1376 dispatchOnFragmentViewDestroyed(f, false); 1377 if (f.mView != null && f.mContainer != null) { 1378 if (getTargetSdk() >= Build.VERSION_CODES.O) { 1379 // Stop any current animations: 1380 f.mView.clearAnimation(); 1381 f.mContainer.endViewTransition(f.mView); 1382 } 1383 Animator anim = null; 1384 if (mCurState > Fragment.INITIALIZING && !mDestroyed 1385 && f.mView.getVisibility() == View.VISIBLE 1386 && f.mView.getTransitionAlpha() > 0) { 1387 anim = loadAnimator(f, transit, false, 1388 transitionStyle); 1389 } 1390 f.mView.setTransitionAlpha(1f); 1391 if (anim != null) { 1392 final ViewGroup container = f.mContainer; 1393 final View view = f.mView; 1394 final Fragment fragment = f; 1395 container.startViewTransition(view); 1396 f.setAnimatingAway(anim); 1397 f.setStateAfterAnimating(newState); 1398 anim.addListener(new AnimatorListenerAdapter() { 1399 @Override 1400 public void onAnimationEnd(Animator anim) { 1401 container.endViewTransition(view); 1402 Animator animator = f.getAnimatingAway(); 1403 f.setAnimatingAway(null); 1404 // If the animation finished immediately, the fragment's 1405 // view will still be there. If so, we can just pretend 1406 // there was no animation and skip the moveToState() 1407 if (container.indexOfChild(view) == -1 1408 && animator != null) { 1409 moveToState(fragment, fragment.getStateAfterAnimating(), 1410 0, 0, false); 1411 } 1412 } 1413 }); 1414 anim.setTarget(f.mView); 1415 setHWLayerAnimListenerIfAlpha(f.mView, anim); 1416 anim.start(); 1417 1418 } 1419 f.mContainer.removeView(f.mView); 1420 } 1421 f.mContainer = null; 1422 f.mView = null; 1423 f.mInLayout = false; 1424 } 1425 // fall through 1426 case Fragment.CREATED: 1427 if (newState < Fragment.CREATED) { 1428 if (mDestroyed) { 1429 if (f.getAnimatingAway() != null) { 1430 // The fragment's containing activity is 1431 // being destroyed, but this fragment is 1432 // currently animating away. Stop the 1433 // animation right now -- it is not needed, 1434 // and we can't wait any more on destroying 1435 // the fragment. 1436 Animator anim = f.getAnimatingAway(); 1437 f.setAnimatingAway(null); 1438 anim.cancel(); 1439 } 1440 } 1441 if (f.getAnimatingAway() != null) { 1442 // We are waiting for the fragment's view to finish 1443 // animating away. Just make a note of the state 1444 // the fragment now should move to once the animation 1445 // is done. 1446 f.setStateAfterAnimating(newState); 1447 newState = Fragment.CREATED; 1448 } else { 1449 if (DEBUG) Log.v(TAG, "movefrom CREATED: " + f); 1450 if (!f.mRetaining) { 1451 f.performDestroy(); 1452 dispatchOnFragmentDestroyed(f, false); 1453 } else { 1454 f.mState = Fragment.INITIALIZING; 1455 } 1456 1457 f.performDetach(); 1458 dispatchOnFragmentDetached(f, false); 1459 if (!keepActive) { 1460 if (!f.mRetaining) { 1461 makeInactive(f); 1462 } else { 1463 f.mHost = null; 1464 f.mParentFragment = null; 1465 f.mFragmentManager = null; 1466 } 1467 } 1468 } 1469 } 1470 } 1471 } 1472 1473 if (f.mState != newState) { 1474 Log.w(TAG, "moveToState: Fragment state for " + f + " not updated inline; " 1475 + "expected state " + newState + " found " + f.mState); 1476 f.mState = newState; 1477 } 1478 } 1479 1480 void moveToState(Fragment f) { 1481 moveToState(f, mCurState, 0, 0, false); 1482 } 1483 1484 void ensureInflatedFragmentView(Fragment f) { 1485 if (f.mFromLayout && !f.mPerformedCreateView) { 1486 f.mView = f.performCreateView(f.performGetLayoutInflater( 1487 f.mSavedFragmentState), null, f.mSavedFragmentState); 1488 if (f.mView != null) { 1489 f.mView.setSaveFromParentEnabled(false); 1490 if (f.mHidden) f.mView.setVisibility(View.GONE); 1491 f.onViewCreated(f.mView, f.mSavedFragmentState); 1492 dispatchOnFragmentViewCreated(f, f.mView, f.mSavedFragmentState, false); 1493 } 1494 } 1495 } 1496 1497 /** 1498 * Fragments that have been shown or hidden don't have their visibility changed or 1499 * animations run during the {@link #showFragment(Fragment)} or {@link #hideFragment(Fragment)} 1500 * calls. After fragments are brought to their final state in 1501 * {@link #moveFragmentToExpectedState(Fragment)} the fragments that have been shown or 1502 * hidden must have their visibility changed and their animations started here. 1503 * 1504 * @param fragment The fragment with mHiddenChanged = true that should change its View's 1505 * visibility and start the show or hide animation. 1506 */ 1507 void completeShowHideFragment(final Fragment fragment) { 1508 if (fragment.mView != null) { 1509 Animator anim = loadAnimator(fragment, fragment.getNextTransition(), !fragment.mHidden, 1510 fragment.getNextTransitionStyle()); 1511 if (anim != null) { 1512 anim.setTarget(fragment.mView); 1513 if (fragment.mHidden) { 1514 if (fragment.isHideReplaced()) { 1515 fragment.setHideReplaced(false); 1516 } else { 1517 final ViewGroup container = fragment.mContainer; 1518 final View animatingView = fragment.mView; 1519 if (container != null) { 1520 container.startViewTransition(animatingView); 1521 } 1522 // Delay the actual hide operation until the animation finishes, otherwise 1523 // the fragment will just immediately disappear 1524 anim.addListener(new AnimatorListenerAdapter() { 1525 @Override 1526 public void onAnimationEnd(Animator animation) { 1527 if (container != null) { 1528 container.endViewTransition(animatingView); 1529 } 1530 animation.removeListener(this); 1531 animatingView.setVisibility(View.GONE); 1532 } 1533 }); 1534 } 1535 } else { 1536 fragment.mView.setVisibility(View.VISIBLE); 1537 } 1538 setHWLayerAnimListenerIfAlpha(fragment.mView, anim); 1539 anim.start(); 1540 } else { 1541 final int visibility = fragment.mHidden && !fragment.isHideReplaced() 1542 ? View.GONE 1543 : View.VISIBLE; 1544 fragment.mView.setVisibility(visibility); 1545 if (fragment.isHideReplaced()) { 1546 fragment.setHideReplaced(false); 1547 } 1548 } 1549 } 1550 if (fragment.mAdded && fragment.mHasMenu && fragment.mMenuVisible) { 1551 mNeedMenuInvalidate = true; 1552 } 1553 fragment.mHiddenChanged = false; 1554 fragment.onHiddenChanged(fragment.mHidden); 1555 } 1556 1557 /** 1558 * Moves a fragment to its expected final state or the fragment manager's state, depending 1559 * on whether the fragment manager's state is raised properly. 1560 * 1561 * @param f The fragment to change. 1562 */ 1563 void moveFragmentToExpectedState(final Fragment f) { 1564 if (f == null) { 1565 return; 1566 } 1567 int nextState = mCurState; 1568 if (f.mRemoving) { 1569 if (f.isInBackStack()) { 1570 nextState = Math.min(nextState, Fragment.CREATED); 1571 } else { 1572 nextState = Math.min(nextState, Fragment.INITIALIZING); 1573 } 1574 } 1575 1576 moveToState(f, nextState, f.getNextTransition(), f.getNextTransitionStyle(), false); 1577 1578 if (f.mView != null) { 1579 // Move the view if it is out of order 1580 Fragment underFragment = findFragmentUnder(f); 1581 if (underFragment != null) { 1582 final View underView = underFragment.mView; 1583 // make sure this fragment is in the right order. 1584 final ViewGroup container = f.mContainer; 1585 int underIndex = container.indexOfChild(underView); 1586 int viewIndex = container.indexOfChild(f.mView); 1587 if (viewIndex < underIndex) { 1588 container.removeViewAt(viewIndex); 1589 container.addView(f.mView, underIndex); 1590 } 1591 } 1592 if (f.mIsNewlyAdded && f.mContainer != null) { 1593 // Make it visible and run the animations 1594 f.mView.setTransitionAlpha(1f); 1595 f.mIsNewlyAdded = false; 1596 // run animations: 1597 Animator anim = loadAnimator(f, f.getNextTransition(), true, f.getNextTransitionStyle()); 1598 if (anim != null) { 1599 anim.setTarget(f.mView); 1600 setHWLayerAnimListenerIfAlpha(f.mView, anim); 1601 anim.start(); 1602 } 1603 } 1604 } 1605 if (f.mHiddenChanged) { 1606 completeShowHideFragment(f); 1607 } 1608 } 1609 1610 /** 1611 * Changes the state of the fragment manager to {@code newState}. If the fragment manager 1612 * changes state or {@code always} is {@code true}, any fragments within it have their 1613 * states updated as well. 1614 * 1615 * @param newState The new state for the fragment manager 1616 * @param always If {@code true}, all fragments update their state, even 1617 * if {@code newState} matches the current fragment manager's state. 1618 */ 1619 void moveToState(int newState, boolean always) { 1620 if (mHost == null && newState != Fragment.INITIALIZING) { 1621 throw new IllegalStateException("No activity"); 1622 } 1623 1624 if (!always && mCurState == newState) { 1625 return; 1626 } 1627 1628 mCurState = newState; 1629 1630 if (mActive != null) { 1631 boolean loadersRunning = false; 1632 1633 // Must add them in the proper order. mActive fragments may be out of order 1634 final int numAdded = mAdded.size(); 1635 for (int i = 0; i < numAdded; i++) { 1636 Fragment f = mAdded.get(i); 1637 moveFragmentToExpectedState(f); 1638 if (f.mLoaderManager != null) { 1639 loadersRunning |= f.mLoaderManager.hasRunningLoaders(); 1640 } 1641 } 1642 1643 // Now iterate through all active fragments. These will include those that are removed 1644 // and detached. 1645 final int numActive = mActive.size(); 1646 for (int i = 0; i < numActive; i++) { 1647 Fragment f = mActive.valueAt(i); 1648 if (f != null && (f.mRemoving || f.mDetached) && !f.mIsNewlyAdded) { 1649 moveFragmentToExpectedState(f); 1650 if (f.mLoaderManager != null) { 1651 loadersRunning |= f.mLoaderManager.hasRunningLoaders(); 1652 } 1653 } 1654 } 1655 1656 if (!loadersRunning) { 1657 startPendingDeferredFragments(); 1658 } 1659 1660 if (mNeedMenuInvalidate && mHost != null && mCurState == Fragment.RESUMED) { 1661 mHost.onInvalidateOptionsMenu(); 1662 mNeedMenuInvalidate = false; 1663 } 1664 } 1665 } 1666 1667 void startPendingDeferredFragments() { 1668 if (mActive == null) return; 1669 1670 for (int i=0; i<mActive.size(); i++) { 1671 Fragment f = mActive.valueAt(i); 1672 if (f != null) { 1673 performPendingDeferredStart(f); 1674 } 1675 } 1676 } 1677 1678 void makeActive(Fragment f) { 1679 if (f.mIndex >= 0) { 1680 return; 1681 } 1682 1683 f.setIndex(mNextFragmentIndex++, mParent); 1684 if (mActive == null) { 1685 mActive = new SparseArray<>(); 1686 } 1687 mActive.put(f.mIndex, f); 1688 if (DEBUG) Log.v(TAG, "Allocated fragment index " + f); 1689 } 1690 1691 void makeInactive(Fragment f) { 1692 if (f.mIndex < 0) { 1693 return; 1694 } 1695 1696 if (DEBUG) Log.v(TAG, "Freeing fragment index " + f); 1697 // Don't remove yet. That happens in burpActive(). This prevents 1698 // concurrent modification while iterating over mActive 1699 mActive.put(f.mIndex, null); 1700 mHost.inactivateFragment(f.mWho); 1701 f.initState(); 1702 } 1703 1704 public void addFragment(Fragment fragment, boolean moveToStateNow) { 1705 if (DEBUG) Log.v(TAG, "add: " + fragment); 1706 makeActive(fragment); 1707 if (!fragment.mDetached) { 1708 if (mAdded.contains(fragment)) { 1709 throw new IllegalStateException("Fragment already added: " + fragment); 1710 } 1711 synchronized (mAdded) { 1712 mAdded.add(fragment); 1713 } 1714 fragment.mAdded = true; 1715 fragment.mRemoving = false; 1716 if (fragment.mView == null) { 1717 fragment.mHiddenChanged = false; 1718 } 1719 if (fragment.mHasMenu && fragment.mMenuVisible) { 1720 mNeedMenuInvalidate = true; 1721 } 1722 if (moveToStateNow) { 1723 moveToState(fragment); 1724 } 1725 } 1726 } 1727 1728 public void removeFragment(Fragment fragment) { 1729 if (DEBUG) Log.v(TAG, "remove: " + fragment + " nesting=" + fragment.mBackStackNesting); 1730 final boolean inactive = !fragment.isInBackStack(); 1731 if (!fragment.mDetached || inactive) { 1732 if (false) { 1733 // Would be nice to catch a bad remove here, but we need 1734 // time to test this to make sure we aren't crashes cases 1735 // where it is not a problem. 1736 if (!mAdded.contains(fragment)) { 1737 throw new IllegalStateException("Fragment not added: " + fragment); 1738 } 1739 } 1740 synchronized (mAdded) { 1741 mAdded.remove(fragment); 1742 } 1743 if (fragment.mHasMenu && fragment.mMenuVisible) { 1744 mNeedMenuInvalidate = true; 1745 } 1746 fragment.mAdded = false; 1747 fragment.mRemoving = true; 1748 } 1749 } 1750 1751 /** 1752 * Marks a fragment as hidden to be later animated in with 1753 * {@link #completeShowHideFragment(Fragment)}. 1754 * 1755 * @param fragment The fragment to be shown. 1756 */ 1757 public void hideFragment(Fragment fragment) { 1758 if (DEBUG) Log.v(TAG, "hide: " + fragment); 1759 if (!fragment.mHidden) { 1760 fragment.mHidden = true; 1761 // Toggle hidden changed so that if a fragment goes through show/hide/show 1762 // it doesn't go through the animation. 1763 fragment.mHiddenChanged = !fragment.mHiddenChanged; 1764 } 1765 } 1766 1767 /** 1768 * Marks a fragment as shown to be later animated in with 1769 * {@link #completeShowHideFragment(Fragment)}. 1770 * 1771 * @param fragment The fragment to be shown. 1772 */ 1773 public void showFragment(Fragment fragment) { 1774 if (DEBUG) Log.v(TAG, "show: " + fragment); 1775 if (fragment.mHidden) { 1776 fragment.mHidden = false; 1777 // Toggle hidden changed so that if a fragment goes through show/hide/show 1778 // it doesn't go through the animation. 1779 fragment.mHiddenChanged = !fragment.mHiddenChanged; 1780 } 1781 } 1782 1783 public void detachFragment(Fragment fragment) { 1784 if (DEBUG) Log.v(TAG, "detach: " + fragment); 1785 if (!fragment.mDetached) { 1786 fragment.mDetached = true; 1787 if (fragment.mAdded) { 1788 // We are not already in back stack, so need to remove the fragment. 1789 if (DEBUG) Log.v(TAG, "remove from detach: " + fragment); 1790 synchronized (mAdded) { 1791 mAdded.remove(fragment); 1792 } 1793 if (fragment.mHasMenu && fragment.mMenuVisible) { 1794 mNeedMenuInvalidate = true; 1795 } 1796 fragment.mAdded = false; 1797 } 1798 } 1799 } 1800 1801 public void attachFragment(Fragment fragment) { 1802 if (DEBUG) Log.v(TAG, "attach: " + fragment); 1803 if (fragment.mDetached) { 1804 fragment.mDetached = false; 1805 if (!fragment.mAdded) { 1806 if (mAdded.contains(fragment)) { 1807 throw new IllegalStateException("Fragment already added: " + fragment); 1808 } 1809 if (DEBUG) Log.v(TAG, "add from attach: " + fragment); 1810 synchronized (mAdded) { 1811 mAdded.add(fragment); 1812 } 1813 fragment.mAdded = true; 1814 if (fragment.mHasMenu && fragment.mMenuVisible) { 1815 mNeedMenuInvalidate = true; 1816 } 1817 } 1818 } 1819 } 1820 1821 public Fragment findFragmentById(int id) { 1822 // First look through added fragments. 1823 for (int i = mAdded.size() - 1; i >= 0; i--) { 1824 Fragment f = mAdded.get(i); 1825 if (f != null && f.mFragmentId == id) { 1826 return f; 1827 } 1828 } 1829 if (mActive != null) { 1830 // Now for any known fragment. 1831 for (int i=mActive.size()-1; i>=0; i--) { 1832 Fragment f = mActive.valueAt(i); 1833 if (f != null && f.mFragmentId == id) { 1834 return f; 1835 } 1836 } 1837 } 1838 return null; 1839 } 1840 1841 public Fragment findFragmentByTag(String tag) { 1842 if (tag != null) { 1843 // First look through added fragments. 1844 for (int i=mAdded.size()-1; i>=0; i--) { 1845 Fragment f = mAdded.get(i); 1846 if (f != null && tag.equals(f.mTag)) { 1847 return f; 1848 } 1849 } 1850 } 1851 if (mActive != null && tag != null) { 1852 // Now for any known fragment. 1853 for (int i=mActive.size()-1; i>=0; i--) { 1854 Fragment f = mActive.valueAt(i); 1855 if (f != null && tag.equals(f.mTag)) { 1856 return f; 1857 } 1858 } 1859 } 1860 return null; 1861 } 1862 1863 public Fragment findFragmentByWho(String who) { 1864 if (mActive != null && who != null) { 1865 for (int i=mActive.size()-1; i>=0; i--) { 1866 Fragment f = mActive.valueAt(i); 1867 if (f != null && (f=f.findFragmentByWho(who)) != null) { 1868 return f; 1869 } 1870 } 1871 } 1872 return null; 1873 } 1874 1875 private void checkStateLoss() { 1876 if (mStateSaved) { 1877 throw new IllegalStateException( 1878 "Can not perform this action after onSaveInstanceState"); 1879 } 1880 if (mNoTransactionsBecause != null) { 1881 throw new IllegalStateException( 1882 "Can not perform this action inside of " + mNoTransactionsBecause); 1883 } 1884 } 1885 1886 @Override 1887 public boolean isStateSaved() { 1888 return mStateSaved; 1889 } 1890 1891 /** 1892 * Adds an action to the queue of pending actions. 1893 * 1894 * @param action the action to add 1895 * @param allowStateLoss whether to allow loss of state information 1896 * @throws IllegalStateException if the activity has been destroyed 1897 */ 1898 public void enqueueAction(OpGenerator action, boolean allowStateLoss) { 1899 if (!allowStateLoss) { 1900 checkStateLoss(); 1901 } 1902 synchronized (this) { 1903 if (mDestroyed || mHost == null) { 1904 if (allowStateLoss) { 1905 // This FragmentManager isn't attached, so drop the entire transaction. 1906 return; 1907 } 1908 throw new IllegalStateException("Activity has been destroyed"); 1909 } 1910 if (mPendingActions == null) { 1911 mPendingActions = new ArrayList<>(); 1912 } 1913 mPendingActions.add(action); 1914 scheduleCommit(); 1915 } 1916 } 1917 1918 /** 1919 * Schedules the execution when one hasn't been scheduled already. This should happen 1920 * the first time {@link #enqueueAction(OpGenerator, boolean)} is called or when 1921 * a postponed transaction has been started with 1922 * {@link Fragment#startPostponedEnterTransition()} 1923 */ 1924 private void scheduleCommit() { 1925 synchronized (this) { 1926 boolean postponeReady = 1927 mPostponedTransactions != null && !mPostponedTransactions.isEmpty(); 1928 boolean pendingReady = mPendingActions != null && mPendingActions.size() == 1; 1929 if (postponeReady || pendingReady) { 1930 mHost.getHandler().removeCallbacks(mExecCommit); 1931 mHost.getHandler().post(mExecCommit); 1932 } 1933 } 1934 } 1935 1936 public int allocBackStackIndex(BackStackRecord bse) { 1937 synchronized (this) { 1938 if (mAvailBackStackIndices == null || mAvailBackStackIndices.size() <= 0) { 1939 if (mBackStackIndices == null) { 1940 mBackStackIndices = new ArrayList<BackStackRecord>(); 1941 } 1942 int index = mBackStackIndices.size(); 1943 if (DEBUG) Log.v(TAG, "Setting back stack index " + index + " to " + bse); 1944 mBackStackIndices.add(bse); 1945 return index; 1946 1947 } else { 1948 int index = mAvailBackStackIndices.remove(mAvailBackStackIndices.size()-1); 1949 if (DEBUG) Log.v(TAG, "Adding back stack index " + index + " with " + bse); 1950 mBackStackIndices.set(index, bse); 1951 return index; 1952 } 1953 } 1954 } 1955 1956 public void setBackStackIndex(int index, BackStackRecord bse) { 1957 synchronized (this) { 1958 if (mBackStackIndices == null) { 1959 mBackStackIndices = new ArrayList<BackStackRecord>(); 1960 } 1961 int N = mBackStackIndices.size(); 1962 if (index < N) { 1963 if (DEBUG) Log.v(TAG, "Setting back stack index " + index + " to " + bse); 1964 mBackStackIndices.set(index, bse); 1965 } else { 1966 while (N < index) { 1967 mBackStackIndices.add(null); 1968 if (mAvailBackStackIndices == null) { 1969 mAvailBackStackIndices = new ArrayList<Integer>(); 1970 } 1971 if (DEBUG) Log.v(TAG, "Adding available back stack index " + N); 1972 mAvailBackStackIndices.add(N); 1973 N++; 1974 } 1975 if (DEBUG) Log.v(TAG, "Adding back stack index " + index + " with " + bse); 1976 mBackStackIndices.add(bse); 1977 } 1978 } 1979 } 1980 1981 public void freeBackStackIndex(int index) { 1982 synchronized (this) { 1983 mBackStackIndices.set(index, null); 1984 if (mAvailBackStackIndices == null) { 1985 mAvailBackStackIndices = new ArrayList<Integer>(); 1986 } 1987 if (DEBUG) Log.v(TAG, "Freeing back stack index " + index); 1988 mAvailBackStackIndices.add(index); 1989 } 1990 } 1991 1992 /** 1993 * Broken out from exec*, this prepares for gathering and executing operations. 1994 * 1995 * @param allowStateLoss true if state loss should be ignored or false if it should be 1996 * checked. 1997 */ 1998 private void ensureExecReady(boolean allowStateLoss) { 1999 if (mExecutingActions) { 2000 throw new IllegalStateException("FragmentManager is already executing transactions"); 2001 } 2002 2003 if (Looper.myLooper() != mHost.getHandler().getLooper()) { 2004 throw new IllegalStateException("Must be called from main thread of fragment host"); 2005 } 2006 2007 if (!allowStateLoss) { 2008 checkStateLoss(); 2009 } 2010 2011 if (mTmpRecords == null) { 2012 mTmpRecords = new ArrayList<>(); 2013 mTmpIsPop = new ArrayList<>(); 2014 } 2015 mExecutingActions = true; 2016 try { 2017 executePostponedTransaction(null, null); 2018 } finally { 2019 mExecutingActions = false; 2020 } 2021 } 2022 2023 public void execSingleAction(OpGenerator action, boolean allowStateLoss) { 2024 if (allowStateLoss && (mHost == null || mDestroyed)) { 2025 // This FragmentManager isn't attached, so drop the entire transaction. 2026 return; 2027 } 2028 ensureExecReady(allowStateLoss); 2029 if (action.generateOps(mTmpRecords, mTmpIsPop)) { 2030 mExecutingActions = true; 2031 try { 2032 removeRedundantOperationsAndExecute(mTmpRecords, mTmpIsPop); 2033 } finally { 2034 cleanupExec(); 2035 } 2036 } 2037 2038 doPendingDeferredStart(); 2039 burpActive(); 2040 } 2041 2042 /** 2043 * Broken out of exec*, this cleans up the mExecutingActions and the temporary structures 2044 * used in executing operations. 2045 */ 2046 private void cleanupExec() { 2047 mExecutingActions = false; 2048 mTmpIsPop.clear(); 2049 mTmpRecords.clear(); 2050 } 2051 2052 /** 2053 * Only call from main thread! 2054 */ 2055 public boolean execPendingActions() { 2056 ensureExecReady(true); 2057 2058 boolean didSomething = false; 2059 while (generateOpsForPendingActions(mTmpRecords, mTmpIsPop)) { 2060 mExecutingActions = true; 2061 try { 2062 removeRedundantOperationsAndExecute(mTmpRecords, mTmpIsPop); 2063 } finally { 2064 cleanupExec(); 2065 } 2066 didSomething = true; 2067 } 2068 2069 doPendingDeferredStart(); 2070 burpActive(); 2071 2072 return didSomething; 2073 } 2074 2075 /** 2076 * Complete the execution of transactions that have previously been postponed, but are 2077 * now ready. 2078 */ 2079 private void executePostponedTransaction(ArrayList<BackStackRecord> records, 2080 ArrayList<Boolean> isRecordPop) { 2081 int numPostponed = mPostponedTransactions == null ? 0 : mPostponedTransactions.size(); 2082 for (int i = 0; i < numPostponed; i++) { 2083 StartEnterTransitionListener listener = mPostponedTransactions.get(i); 2084 if (records != null && !listener.mIsBack) { 2085 int index = records.indexOf(listener.mRecord); 2086 if (index != -1 && isRecordPop.get(index)) { 2087 listener.cancelTransaction(); 2088 continue; 2089 } 2090 } 2091 if (listener.isReady() || (records != null && 2092 listener.mRecord.interactsWith(records, 0, records.size()))) { 2093 mPostponedTransactions.remove(i); 2094 i--; 2095 numPostponed--; 2096 int index; 2097 if (records != null && !listener.mIsBack && 2098 (index = records.indexOf(listener.mRecord)) != -1 && 2099 isRecordPop.get(index)) { 2100 // This is popping a postponed transaction 2101 listener.cancelTransaction(); 2102 } else { 2103 listener.completeTransaction(); 2104 } 2105 } 2106 } 2107 } 2108 2109 /** 2110 * Remove redundant BackStackRecord operations and executes them. This method merges operations 2111 * of proximate records that allow reordering. See 2112 * {@link FragmentTransaction#setReorderingAllowed(boolean)}. 2113 * <p> 2114 * For example, a transaction that adds to the back stack and then another that pops that 2115 * back stack record will be optimized to remove the unnecessary operation. 2116 * <p> 2117 * Likewise, two transactions committed that are executed at the same time will be optimized 2118 * to remove the redundant operations as well as two pop operations executed together. 2119 * 2120 * @param records The records pending execution 2121 * @param isRecordPop The direction that these records are being run. 2122 */ 2123 private void removeRedundantOperationsAndExecute(ArrayList<BackStackRecord> records, 2124 ArrayList<Boolean> isRecordPop) { 2125 if (records == null || records.isEmpty()) { 2126 return; 2127 } 2128 2129 if (isRecordPop == null || records.size() != isRecordPop.size()) { 2130 throw new IllegalStateException("Internal error with the back stack records"); 2131 } 2132 2133 // Force start of any postponed transactions that interact with scheduled transactions: 2134 executePostponedTransaction(records, isRecordPop); 2135 2136 final int numRecords = records.size(); 2137 int startIndex = 0; 2138 for (int recordNum = 0; recordNum < numRecords; recordNum++) { 2139 final boolean canReorder = records.get(recordNum).mReorderingAllowed; 2140 if (!canReorder) { 2141 // execute all previous transactions 2142 if (startIndex != recordNum) { 2143 executeOpsTogether(records, isRecordPop, startIndex, recordNum); 2144 } 2145 // execute all pop operations that don't allow reordering together or 2146 // one add operation 2147 int reorderingEnd = recordNum + 1; 2148 if (isRecordPop.get(recordNum)) { 2149 while (reorderingEnd < numRecords 2150 && isRecordPop.get(reorderingEnd) 2151 && !records.get(reorderingEnd).mReorderingAllowed) { 2152 reorderingEnd++; 2153 } 2154 } 2155 executeOpsTogether(records, isRecordPop, recordNum, reorderingEnd); 2156 startIndex = reorderingEnd; 2157 recordNum = reorderingEnd - 1; 2158 } 2159 } 2160 if (startIndex != numRecords) { 2161 executeOpsTogether(records, isRecordPop, startIndex, numRecords); 2162 } 2163 } 2164 2165 /** 2166 * Executes a subset of a list of BackStackRecords, all of which either allow reordering or 2167 * do not allow ordering. 2168 * @param records A list of BackStackRecords that are to be executed together 2169 * @param isRecordPop The direction that these records are being run. 2170 * @param startIndex The index of the first record in <code>records</code> to be executed 2171 * @param endIndex One more than the final record index in <code>records</code> to executed. 2172 */ 2173 private void executeOpsTogether(ArrayList<BackStackRecord> records, 2174 ArrayList<Boolean> isRecordPop, int startIndex, int endIndex) { 2175 final boolean allowReordering = records.get(startIndex).mReorderingAllowed; 2176 boolean addToBackStack = false; 2177 if (mTmpAddedFragments == null) { 2178 mTmpAddedFragments = new ArrayList<>(); 2179 } else { 2180 mTmpAddedFragments.clear(); 2181 } 2182 mTmpAddedFragments.addAll(mAdded); 2183 Fragment oldPrimaryNav = getPrimaryNavigationFragment(); 2184 for (int recordNum = startIndex; recordNum < endIndex; recordNum++) { 2185 final BackStackRecord record = records.get(recordNum); 2186 final boolean isPop = isRecordPop.get(recordNum); 2187 if (!isPop) { 2188 oldPrimaryNav = record.expandOps(mTmpAddedFragments, oldPrimaryNav); 2189 } else { 2190 record.trackAddedFragmentsInPop(mTmpAddedFragments); 2191 } 2192 addToBackStack = addToBackStack || record.mAddToBackStack; 2193 } 2194 mTmpAddedFragments.clear(); 2195 2196 if (!allowReordering) { 2197 FragmentTransition.startTransitions(this, records, isRecordPop, startIndex, endIndex, 2198 false); 2199 } 2200 executeOps(records, isRecordPop, startIndex, endIndex); 2201 2202 int postponeIndex = endIndex; 2203 if (allowReordering) { 2204 ArraySet<Fragment> addedFragments = new ArraySet<>(); 2205 addAddedFragments(addedFragments); 2206 postponeIndex = postponePostponableTransactions(records, isRecordPop, 2207 startIndex, endIndex, addedFragments); 2208 makeRemovedFragmentsInvisible(addedFragments); 2209 } 2210 2211 if (postponeIndex != startIndex && allowReordering) { 2212 // need to run something now 2213 FragmentTransition.startTransitions(this, records, isRecordPop, startIndex, 2214 postponeIndex, true); 2215 moveToState(mCurState, true); 2216 } 2217 2218 for (int recordNum = startIndex; recordNum < endIndex; recordNum++) { 2219 final BackStackRecord record = records.get(recordNum); 2220 final boolean isPop = isRecordPop.get(recordNum); 2221 if (isPop && record.mIndex >= 0) { 2222 freeBackStackIndex(record.mIndex); 2223 record.mIndex = -1; 2224 } 2225 record.runOnCommitRunnables(); 2226 } 2227 2228 if (addToBackStack) { 2229 reportBackStackChanged(); 2230 } 2231 } 2232 2233 /** 2234 * Any fragments that were removed because they have been postponed should have their views 2235 * made invisible by setting their transition alpha to 0. 2236 * 2237 * @param fragments The fragments that were added during operation execution. Only the ones 2238 * that are no longer added will have their transition alpha changed. 2239 */ 2240 private void makeRemovedFragmentsInvisible(ArraySet<Fragment> fragments) { 2241 final int numAdded = fragments.size(); 2242 for (int i = 0; i < numAdded; i++) { 2243 final Fragment fragment = fragments.valueAt(i); 2244 if (!fragment.mAdded) { 2245 final View view = fragment.getView(); 2246 view.setTransitionAlpha(0f); 2247 } 2248 } 2249 } 2250 2251 /** 2252 * Examine all transactions and determine which ones are marked as postponed. Those will 2253 * have their operations rolled back and moved to the end of the record list (up to endIndex). 2254 * It will also add the postponed transaction to the queue. 2255 * 2256 * @param records A list of BackStackRecords that should be checked. 2257 * @param isRecordPop The direction that these records are being run. 2258 * @param startIndex The index of the first record in <code>records</code> to be checked 2259 * @param endIndex One more than the final record index in <code>records</code> to be checked. 2260 * @return The index of the first postponed transaction or endIndex if no transaction was 2261 * postponed. 2262 */ 2263 private int postponePostponableTransactions(ArrayList<BackStackRecord> records, 2264 ArrayList<Boolean> isRecordPop, int startIndex, int endIndex, 2265 ArraySet<Fragment> added) { 2266 int postponeIndex = endIndex; 2267 for (int i = endIndex - 1; i >= startIndex; i--) { 2268 final BackStackRecord record = records.get(i); 2269 final boolean isPop = isRecordPop.get(i); 2270 boolean isPostponed = record.isPostponed() && 2271 !record.interactsWith(records, i + 1, endIndex); 2272 if (isPostponed) { 2273 if (mPostponedTransactions == null) { 2274 mPostponedTransactions = new ArrayList<>(); 2275 } 2276 StartEnterTransitionListener listener = 2277 new StartEnterTransitionListener(record, isPop); 2278 mPostponedTransactions.add(listener); 2279 record.setOnStartPostponedListener(listener); 2280 2281 // roll back the transaction 2282 if (isPop) { 2283 record.executeOps(); 2284 } else { 2285 record.executePopOps(false); 2286 } 2287 2288 // move to the end 2289 postponeIndex--; 2290 if (i != postponeIndex) { 2291 records.remove(i); 2292 records.add(postponeIndex, record); 2293 } 2294 2295 // different views may be visible now 2296 addAddedFragments(added); 2297 } 2298 } 2299 return postponeIndex; 2300 } 2301 2302 /** 2303 * When a postponed transaction is ready to be started, this completes the transaction, 2304 * removing, hiding, or showing views as well as starting the animations and transitions. 2305 * <p> 2306 * {@code runtransitions} is set to false when the transaction postponement was interrupted 2307 * abnormally -- normally by a new transaction being started that affects the postponed 2308 * transaction. 2309 * 2310 * @param record The transaction to run 2311 * @param isPop true if record is popping or false if it is adding 2312 * @param runTransitions true if the fragment transition should be run or false otherwise. 2313 * @param moveToState true if the state should be changed after executing the operations. 2314 * This is false when the transaction is canceled when a postponed 2315 * transaction is popped. 2316 */ 2317 private void completeExecute(BackStackRecord record, boolean isPop, boolean runTransitions, 2318 boolean moveToState) { 2319 if (isPop) { 2320 record.executePopOps(moveToState); 2321 } else { 2322 record.executeOps(); 2323 } 2324 ArrayList<BackStackRecord> records = new ArrayList<>(1); 2325 ArrayList<Boolean> isRecordPop = new ArrayList<>(1); 2326 records.add(record); 2327 isRecordPop.add(isPop); 2328 if (runTransitions) { 2329 FragmentTransition.startTransitions(this, records, isRecordPop, 0, 1, true); 2330 } 2331 if (moveToState) { 2332 moveToState(mCurState, true); 2333 } 2334 2335 if (mActive != null) { 2336 final int numActive = mActive.size(); 2337 for (int i = 0; i < numActive; i++) { 2338 // Allow added fragments to be removed during the pop since we aren't going 2339 // to move them to the final state with moveToState(mCurState). 2340 Fragment fragment = mActive.valueAt(i); 2341 if (fragment != null && fragment.mView != null && fragment.mIsNewlyAdded 2342 && record.interactsWith(fragment.mContainerId)) { 2343 fragment.mIsNewlyAdded = false; 2344 } 2345 } 2346 } 2347 } 2348 2349 /** 2350 * Find a fragment within the fragment's container whose View should be below the passed 2351 * fragment. {@code null} is returned when the fragment has no View or if there should be 2352 * no fragment with a View below the given fragment. 2353 * 2354 * As an example, if mAdded has two Fragments with Views sharing the same container: 2355 * FragmentA 2356 * FragmentB 2357 * 2358 * Then, when processing FragmentB, FragmentA will be returned. If, however, FragmentA 2359 * had no View, null would be returned. 2360 * 2361 * @param f The fragment that may be on top of another fragment. 2362 * @return The fragment with a View under f, if one exists or null if f has no View or 2363 * there are no fragments with Views in the same container. 2364 */ 2365 private Fragment findFragmentUnder(Fragment f) { 2366 final ViewGroup container = f.mContainer; 2367 final View view = f.mView; 2368 2369 if (container == null || view == null) { 2370 return null; 2371 } 2372 2373 final int fragmentIndex = mAdded.indexOf(f); 2374 for (int i = fragmentIndex - 1; i >= 0; i--) { 2375 Fragment underFragment = mAdded.get(i); 2376 if (underFragment.mContainer == container && underFragment.mView != null) { 2377 // Found the fragment under this one 2378 return underFragment; 2379 } 2380 } 2381 return null; 2382 } 2383 2384 /** 2385 * Run the operations in the BackStackRecords, either to push or pop. 2386 * 2387 * @param records The list of records whose operations should be run. 2388 * @param isRecordPop The direction that these records are being run. 2389 * @param startIndex The index of the first entry in records to run. 2390 * @param endIndex One past the index of the final entry in records to run. 2391 */ 2392 private static void executeOps(ArrayList<BackStackRecord> records, 2393 ArrayList<Boolean> isRecordPop, int startIndex, int endIndex) { 2394 for (int i = startIndex; i < endIndex; i++) { 2395 final BackStackRecord record = records.get(i); 2396 final boolean isPop = isRecordPop.get(i); 2397 if (isPop) { 2398 record.bumpBackStackNesting(-1); 2399 // Only execute the add operations at the end of 2400 // all transactions. 2401 boolean moveToState = i == (endIndex - 1); 2402 record.executePopOps(moveToState); 2403 } else { 2404 record.bumpBackStackNesting(1); 2405 record.executeOps(); 2406 } 2407 } 2408 } 2409 2410 /** 2411 * Ensure that fragments that are added are moved to at least the CREATED state. 2412 * Any newly-added Views are inserted into {@code added} so that the Transaction can be 2413 * postponed with {@link Fragment#postponeEnterTransition()}. They will later be made 2414 * invisible by changing their transitionAlpha to 0 if they have been removed when postponed. 2415 */ 2416 private void addAddedFragments(ArraySet<Fragment> added) { 2417 if (mCurState < Fragment.CREATED) { 2418 return; 2419 } 2420 // We want to leave the fragment in the started state 2421 final int state = Math.min(mCurState, Fragment.STARTED); 2422 final int numAdded = mAdded.size(); 2423 for (int i = 0; i < numAdded; i++) { 2424 Fragment fragment = mAdded.get(i); 2425 if (fragment.mState < state) { 2426 moveToState(fragment, state, fragment.getNextAnim(), fragment.getNextTransition(), false); 2427 if (fragment.mView != null && !fragment.mHidden && fragment.mIsNewlyAdded) { 2428 added.add(fragment); 2429 } 2430 } 2431 } 2432 } 2433 2434 /** 2435 * Starts all postponed transactions regardless of whether they are ready or not. 2436 */ 2437 private void forcePostponedTransactions() { 2438 if (mPostponedTransactions != null) { 2439 while (!mPostponedTransactions.isEmpty()) { 2440 mPostponedTransactions.remove(0).completeTransaction(); 2441 } 2442 } 2443 } 2444 2445 /** 2446 * Ends the animations of fragments so that they immediately reach the end state. 2447 * This is used prior to saving the state so that the correct state is saved. 2448 */ 2449 private void endAnimatingAwayFragments() { 2450 final int numFragments = mActive == null ? 0 : mActive.size(); 2451 for (int i = 0; i < numFragments; i++) { 2452 Fragment fragment = mActive.valueAt(i); 2453 if (fragment != null && fragment.getAnimatingAway() != null) { 2454 // Give up waiting for the animation and just end it. 2455 fragment.getAnimatingAway().end(); 2456 } 2457 } 2458 } 2459 2460 /** 2461 * Adds all records in the pending actions to records and whether they are add or pop 2462 * operations to isPop. After executing, the pending actions will be empty. 2463 * 2464 * @param records All pending actions will generate BackStackRecords added to this. 2465 * This contains the transactions, in order, to execute. 2466 * @param isPop All pending actions will generate booleans to add to this. This contains 2467 * an entry for each entry in records to indicate whether or not it is a 2468 * pop action. 2469 */ 2470 private boolean generateOpsForPendingActions(ArrayList<BackStackRecord> records, 2471 ArrayList<Boolean> isPop) { 2472 boolean didSomething = false; 2473 synchronized (this) { 2474 if (mPendingActions == null || mPendingActions.size() == 0) { 2475 return false; 2476 } 2477 2478 final int numActions = mPendingActions.size(); 2479 for (int i = 0; i < numActions; i++) { 2480 didSomething |= mPendingActions.get(i).generateOps(records, isPop); 2481 } 2482 mPendingActions.clear(); 2483 mHost.getHandler().removeCallbacks(mExecCommit); 2484 } 2485 return didSomething; 2486 } 2487 2488 void doPendingDeferredStart() { 2489 if (mHavePendingDeferredStart) { 2490 boolean loadersRunning = false; 2491 for (int i=0; i<mActive.size(); i++) { 2492 Fragment f = mActive.valueAt(i); 2493 if (f != null && f.mLoaderManager != null) { 2494 loadersRunning |= f.mLoaderManager.hasRunningLoaders(); 2495 } 2496 } 2497 if (!loadersRunning) { 2498 mHavePendingDeferredStart = false; 2499 startPendingDeferredFragments(); 2500 } 2501 } 2502 } 2503 2504 void reportBackStackChanged() { 2505 if (mBackStackChangeListeners != null) { 2506 for (int i=0; i<mBackStackChangeListeners.size(); i++) { 2507 mBackStackChangeListeners.get(i).onBackStackChanged(); 2508 } 2509 } 2510 } 2511 2512 void addBackStackState(BackStackRecord state) { 2513 if (mBackStack == null) { 2514 mBackStack = new ArrayList<BackStackRecord>(); 2515 } 2516 mBackStack.add(state); 2517 } 2518 2519 boolean popBackStackState(ArrayList<BackStackRecord> records, ArrayList<Boolean> isRecordPop, 2520 String name, int id, int flags) { 2521 if (mBackStack == null) { 2522 return false; 2523 } 2524 if (name == null && id < 0 && (flags & POP_BACK_STACK_INCLUSIVE) == 0) { 2525 int last = mBackStack.size() - 1; 2526 if (last < 0) { 2527 return false; 2528 } 2529 records.add(mBackStack.remove(last)); 2530 isRecordPop.add(true); 2531 } else { 2532 int index = -1; 2533 if (name != null || id >= 0) { 2534 // If a name or ID is specified, look for that place in 2535 // the stack. 2536 index = mBackStack.size()-1; 2537 while (index >= 0) { 2538 BackStackRecord bss = mBackStack.get(index); 2539 if (name != null && name.equals(bss.getName())) { 2540 break; 2541 } 2542 if (id >= 0 && id == bss.mIndex) { 2543 break; 2544 } 2545 index--; 2546 } 2547 if (index < 0) { 2548 return false; 2549 } 2550 if ((flags&POP_BACK_STACK_INCLUSIVE) != 0) { 2551 index--; 2552 // Consume all following entries that match. 2553 while (index >= 0) { 2554 BackStackRecord bss = mBackStack.get(index); 2555 if ((name != null && name.equals(bss.getName())) 2556 || (id >= 0 && id == bss.mIndex)) { 2557 index--; 2558 continue; 2559 } 2560 break; 2561 } 2562 } 2563 } 2564 if (index == mBackStack.size()-1) { 2565 return false; 2566 } 2567 for (int i = mBackStack.size() - 1; i > index; i--) { 2568 records.add(mBackStack.remove(i)); 2569 isRecordPop.add(true); 2570 } 2571 } 2572 return true; 2573 } 2574 2575 FragmentManagerNonConfig retainNonConfig() { 2576 setRetaining(mSavedNonConfig); 2577 return mSavedNonConfig; 2578 } 2579 2580 /** 2581 * Recurse the FragmentManagerNonConfig fragments and set the mRetaining to true. This 2582 * was previously done while saving the non-config state, but that has been moved to 2583 * {@link #saveNonConfig()} called from {@link #saveAllState()}. If mRetaining is set too 2584 * early, the fragment won't be destroyed when the FragmentManager is destroyed. 2585 */ 2586 private static void setRetaining(FragmentManagerNonConfig nonConfig) { 2587 if (nonConfig == null) { 2588 return; 2589 } 2590 List<Fragment> fragments = nonConfig.getFragments(); 2591 if (fragments != null) { 2592 for (Fragment fragment : fragments) { 2593 fragment.mRetaining = true; 2594 } 2595 } 2596 List<FragmentManagerNonConfig> children = nonConfig.getChildNonConfigs(); 2597 if (children != null) { 2598 for (FragmentManagerNonConfig child : children) { 2599 setRetaining(child); 2600 } 2601 } 2602 } 2603 2604 void saveNonConfig() { 2605 ArrayList<Fragment> fragments = null; 2606 ArrayList<FragmentManagerNonConfig> childFragments = null; 2607 if (mActive != null) { 2608 for (int i=0; i<mActive.size(); i++) { 2609 Fragment f = mActive.valueAt(i); 2610 if (f != null) { 2611 if (f.mRetainInstance) { 2612 if (fragments == null) { 2613 fragments = new ArrayList<>(); 2614 } 2615 fragments.add(f); 2616 f.mTargetIndex = f.mTarget != null ? f.mTarget.mIndex : -1; 2617 if (DEBUG) Log.v(TAG, "retainNonConfig: keeping retained " + f); 2618 } 2619 FragmentManagerNonConfig child; 2620 if (f.mChildFragmentManager != null) { 2621 f.mChildFragmentManager.saveNonConfig(); 2622 child = f.mChildFragmentManager.mSavedNonConfig; 2623 } else { 2624 // f.mChildNonConfig may be not null, when the parent fragment is 2625 // in the backstack. 2626 child = f.mChildNonConfig; 2627 } 2628 2629 if (childFragments == null && child != null) { 2630 childFragments = new ArrayList<>(mActive.size()); 2631 for (int j = 0; j < i; j++) { 2632 childFragments.add(null); 2633 } 2634 } 2635 2636 if (childFragments != null) { 2637 childFragments.add(child); 2638 } 2639 } 2640 } 2641 } 2642 if (fragments == null && childFragments == null) { 2643 mSavedNonConfig = null; 2644 } else { 2645 mSavedNonConfig = new FragmentManagerNonConfig(fragments, childFragments); 2646 } 2647 } 2648 2649 void saveFragmentViewState(Fragment f) { 2650 if (f.mView == null) { 2651 return; 2652 } 2653 if (mStateArray == null) { 2654 mStateArray = new SparseArray<Parcelable>(); 2655 } else { 2656 mStateArray.clear(); 2657 } 2658 f.mView.saveHierarchyState(mStateArray); 2659 if (mStateArray.size() > 0) { 2660 f.mSavedViewState = mStateArray; 2661 mStateArray = null; 2662 } 2663 } 2664 2665 Bundle saveFragmentBasicState(Fragment f) { 2666 Bundle result = null; 2667 2668 if (mStateBundle == null) { 2669 mStateBundle = new Bundle(); 2670 } 2671 f.performSaveInstanceState(mStateBundle); 2672 dispatchOnFragmentSaveInstanceState(f, mStateBundle, false); 2673 if (!mStateBundle.isEmpty()) { 2674 result = mStateBundle; 2675 mStateBundle = null; 2676 } 2677 2678 if (f.mView != null) { 2679 saveFragmentViewState(f); 2680 } 2681 if (f.mSavedViewState != null) { 2682 if (result == null) { 2683 result = new Bundle(); 2684 } 2685 result.putSparseParcelableArray( 2686 FragmentManagerImpl.VIEW_STATE_TAG, f.mSavedViewState); 2687 } 2688 if (!f.mUserVisibleHint) { 2689 if (result == null) { 2690 result = new Bundle(); 2691 } 2692 // Only add this if it's not the default value 2693 result.putBoolean(FragmentManagerImpl.USER_VISIBLE_HINT_TAG, f.mUserVisibleHint); 2694 } 2695 2696 return result; 2697 } 2698 2699 Parcelable saveAllState() { 2700 // Make sure all pending operations have now been executed to get 2701 // our state update-to-date. 2702 forcePostponedTransactions(); 2703 endAnimatingAwayFragments(); 2704 execPendingActions(); 2705 2706 mStateSaved = true; 2707 mSavedNonConfig = null; 2708 2709 if (mActive == null || mActive.size() <= 0) { 2710 return null; 2711 } 2712 2713 // First collect all active fragments. 2714 int N = mActive.size(); 2715 FragmentState[] active = new FragmentState[N]; 2716 boolean haveFragments = false; 2717 for (int i=0; i<N; i++) { 2718 Fragment f = mActive.valueAt(i); 2719 if (f != null) { 2720 if (f.mIndex < 0) { 2721 throwException(new IllegalStateException( 2722 "Failure saving state: active " + f 2723 + " has cleared index: " + f.mIndex)); 2724 } 2725 2726 haveFragments = true; 2727 2728 FragmentState fs = new FragmentState(f); 2729 active[i] = fs; 2730 2731 if (f.mState > Fragment.INITIALIZING && fs.mSavedFragmentState == null) { 2732 fs.mSavedFragmentState = saveFragmentBasicState(f); 2733 2734 if (f.mTarget != null) { 2735 if (f.mTarget.mIndex < 0) { 2736 throwException(new IllegalStateException( 2737 "Failure saving state: " + f 2738 + " has target not in fragment manager: " + f.mTarget)); 2739 } 2740 if (fs.mSavedFragmentState == null) { 2741 fs.mSavedFragmentState = new Bundle(); 2742 } 2743 putFragment(fs.mSavedFragmentState, 2744 FragmentManagerImpl.TARGET_STATE_TAG, f.mTarget); 2745 if (f.mTargetRequestCode != 0) { 2746 fs.mSavedFragmentState.putInt( 2747 FragmentManagerImpl.TARGET_REQUEST_CODE_STATE_TAG, 2748 f.mTargetRequestCode); 2749 } 2750 } 2751 2752 } else { 2753 fs.mSavedFragmentState = f.mSavedFragmentState; 2754 } 2755 2756 if (DEBUG) Log.v(TAG, "Saved state of " + f + ": " 2757 + fs.mSavedFragmentState); 2758 } 2759 } 2760 2761 if (!haveFragments) { 2762 if (DEBUG) Log.v(TAG, "saveAllState: no fragments!"); 2763 return null; 2764 } 2765 2766 int[] added = null; 2767 BackStackState[] backStack = null; 2768 2769 // Build list of currently added fragments. 2770 N = mAdded.size(); 2771 if (N > 0) { 2772 added = new int[N]; 2773 for (int i=0; i<N; i++) { 2774 added[i] = mAdded.get(i).mIndex; 2775 if (added[i] < 0) { 2776 throwException(new IllegalStateException( 2777 "Failure saving state: active " + mAdded.get(i) 2778 + " has cleared index: " + added[i])); 2779 } 2780 if (DEBUG) Log.v(TAG, "saveAllState: adding fragment #" + i 2781 + ": " + mAdded.get(i)); 2782 } 2783 } 2784 2785 // Now save back stack. 2786 if (mBackStack != null) { 2787 N = mBackStack.size(); 2788 if (N > 0) { 2789 backStack = new BackStackState[N]; 2790 for (int i=0; i<N; i++) { 2791 backStack[i] = new BackStackState(this, mBackStack.get(i)); 2792 if (DEBUG) Log.v(TAG, "saveAllState: adding back stack #" + i 2793 + ": " + mBackStack.get(i)); 2794 } 2795 } 2796 } 2797 2798 FragmentManagerState fms = new FragmentManagerState(); 2799 fms.mActive = active; 2800 fms.mAdded = added; 2801 fms.mBackStack = backStack; 2802 fms.mNextFragmentIndex = mNextFragmentIndex; 2803 if (mPrimaryNav != null) { 2804 fms.mPrimaryNavActiveIndex = mPrimaryNav.mIndex; 2805 } 2806 saveNonConfig(); 2807 return fms; 2808 } 2809 2810 void restoreAllState(Parcelable state, FragmentManagerNonConfig nonConfig) { 2811 // If there is no saved state at all, then there can not be 2812 // any nonConfig fragments either, so that is that. 2813 if (state == null) return; 2814 FragmentManagerState fms = (FragmentManagerState)state; 2815 if (fms.mActive == null) return; 2816 2817 List<FragmentManagerNonConfig> childNonConfigs = null; 2818 2819 // First re-attach any non-config instances we are retaining back 2820 // to their saved state, so we don't try to instantiate them again. 2821 if (nonConfig != null) { 2822 List<Fragment> nonConfigFragments = nonConfig.getFragments(); 2823 childNonConfigs = nonConfig.getChildNonConfigs(); 2824 final int count = nonConfigFragments != null ? nonConfigFragments.size() : 0; 2825 for (int i = 0; i < count; i++) { 2826 Fragment f = nonConfigFragments.get(i); 2827 if (DEBUG) Log.v(TAG, "restoreAllState: re-attaching retained " + f); 2828 int index = 0; // index of f in fms.mActive 2829 while (index < fms.mActive.length && fms.mActive[index].mIndex != f.mIndex) { 2830 index++; 2831 } 2832 if (index == fms.mActive.length) { 2833 throwException(new IllegalStateException("Could not find active fragment " 2834 + "with index " + f.mIndex)); 2835 } 2836 FragmentState fs = fms.mActive[index]; 2837 fs.mInstance = f; 2838 f.mSavedViewState = null; 2839 f.mBackStackNesting = 0; 2840 f.mInLayout = false; 2841 f.mAdded = false; 2842 f.mTarget = null; 2843 if (fs.mSavedFragmentState != null) { 2844 fs.mSavedFragmentState.setClassLoader(mHost.getContext().getClassLoader()); 2845 f.mSavedViewState = fs.mSavedFragmentState.getSparseParcelableArray( 2846 FragmentManagerImpl.VIEW_STATE_TAG); 2847 f.mSavedFragmentState = fs.mSavedFragmentState; 2848 } 2849 } 2850 } 2851 2852 // Build the full list of active fragments, instantiating them from 2853 // their saved state. 2854 mActive = new SparseArray<>(fms.mActive.length); 2855 for (int i=0; i<fms.mActive.length; i++) { 2856 FragmentState fs = fms.mActive[i]; 2857 if (fs != null) { 2858 FragmentManagerNonConfig childNonConfig = null; 2859 if (childNonConfigs != null && i < childNonConfigs.size()) { 2860 childNonConfig = childNonConfigs.get(i); 2861 } 2862 Fragment f = fs.instantiate(mHost, mContainer, mParent, childNonConfig); 2863 if (DEBUG) Log.v(TAG, "restoreAllState: active #" + i + ": " + f); 2864 mActive.put(f.mIndex, f); 2865 // Now that the fragment is instantiated (or came from being 2866 // retained above), clear mInstance in case we end up re-restoring 2867 // from this FragmentState again. 2868 fs.mInstance = null; 2869 } 2870 } 2871 2872 // Update the target of all retained fragments. 2873 if (nonConfig != null) { 2874 List<Fragment> nonConfigFragments = nonConfig.getFragments(); 2875 final int count = nonConfigFragments != null ? nonConfigFragments.size() : 0; 2876 for (int i = 0; i < count; i++) { 2877 Fragment f = nonConfigFragments.get(i); 2878 if (f.mTargetIndex >= 0) { 2879 f.mTarget = mActive.get(f.mTargetIndex); 2880 if (f.mTarget == null) { 2881 Log.w(TAG, "Re-attaching retained fragment " + f 2882 + " target no longer exists: " + f.mTargetIndex); 2883 f.mTarget = null; 2884 } 2885 } 2886 } 2887 } 2888 2889 // Build the list of currently added fragments. 2890 mAdded.clear(); 2891 if (fms.mAdded != null) { 2892 for (int i=0; i<fms.mAdded.length; i++) { 2893 Fragment f = mActive.get(fms.mAdded[i]); 2894 if (f == null) { 2895 throwException(new IllegalStateException( 2896 "No instantiated fragment for index #" + fms.mAdded[i])); 2897 } 2898 f.mAdded = true; 2899 if (DEBUG) Log.v(TAG, "restoreAllState: added #" + i + ": " + f); 2900 if (mAdded.contains(f)) { 2901 throw new IllegalStateException("Already added!"); 2902 } 2903 synchronized (mAdded) { 2904 mAdded.add(f); 2905 } 2906 } 2907 } 2908 2909 // Build the back stack. 2910 if (fms.mBackStack != null) { 2911 mBackStack = new ArrayList<BackStackRecord>(fms.mBackStack.length); 2912 for (int i=0; i<fms.mBackStack.length; i++) { 2913 BackStackRecord bse = fms.mBackStack[i].instantiate(this); 2914 if (DEBUG) { 2915 Log.v(TAG, "restoreAllState: back stack #" + i 2916 + " (index " + bse.mIndex + "): " + bse); 2917 LogWriter logw = new LogWriter(Log.VERBOSE, TAG); 2918 PrintWriter pw = new FastPrintWriter(logw, false, 1024); 2919 bse.dump(" ", pw, false); 2920 pw.flush(); 2921 } 2922 mBackStack.add(bse); 2923 if (bse.mIndex >= 0) { 2924 setBackStackIndex(bse.mIndex, bse); 2925 } 2926 } 2927 } else { 2928 mBackStack = null; 2929 } 2930 2931 if (fms.mPrimaryNavActiveIndex >= 0) { 2932 mPrimaryNav = mActive.get(fms.mPrimaryNavActiveIndex); 2933 } 2934 2935 mNextFragmentIndex = fms.mNextFragmentIndex; 2936 } 2937 2938 /** 2939 * To prevent list modification errors, mActive sets values to null instead of 2940 * removing them when the Fragment becomes inactive. This cleans up the list at the 2941 * end of executing the transactions. 2942 */ 2943 private void burpActive() { 2944 if (mActive != null) { 2945 for (int i = mActive.size() - 1; i >= 0; i--) { 2946 if (mActive.valueAt(i) == null) { 2947 mActive.delete(mActive.keyAt(i)); 2948 } 2949 } 2950 } 2951 } 2952 2953 public void attachController(FragmentHostCallback<?> host, FragmentContainer container, 2954 Fragment parent) { 2955 if (mHost != null) throw new IllegalStateException("Already attached"); 2956 mHost = host; 2957 mContainer = container; 2958 mParent = parent; 2959 mAllowOldReentrantBehavior = getTargetSdk() <= Build.VERSION_CODES.N_MR1; 2960 } 2961 2962 /** 2963 * @return the target SDK of the FragmentManager's application info. If the 2964 * FragmentManager has been torn down, then 0 is returned. 2965 */ 2966 int getTargetSdk() { 2967 if (mHost != null) { 2968 Context context = mHost.getContext(); 2969 if (context != null) { 2970 ApplicationInfo info = context.getApplicationInfo(); 2971 if (info != null) { 2972 return info.targetSdkVersion; 2973 } 2974 } 2975 } 2976 return 0; 2977 } 2978 2979 public void noteStateNotSaved() { 2980 mSavedNonConfig = null; 2981 mStateSaved = false; 2982 final int addedCount = mAdded.size(); 2983 for (int i = 0; i < addedCount; i++) { 2984 Fragment fragment = mAdded.get(i); 2985 if (fragment != null) { 2986 fragment.noteStateNotSaved(); 2987 } 2988 } 2989 } 2990 2991 public void dispatchCreate() { 2992 mStateSaved = false; 2993 dispatchMoveToState(Fragment.CREATED); 2994 } 2995 2996 public void dispatchActivityCreated() { 2997 mStateSaved = false; 2998 dispatchMoveToState(Fragment.ACTIVITY_CREATED); 2999 } 3000 3001 public void dispatchStart() { 3002 mStateSaved = false; 3003 dispatchMoveToState(Fragment.STARTED); 3004 } 3005 3006 public void dispatchResume() { 3007 mStateSaved = false; 3008 dispatchMoveToState(Fragment.RESUMED); 3009 } 3010 3011 public void dispatchPause() { 3012 dispatchMoveToState(Fragment.STARTED); 3013 } 3014 3015 public void dispatchStop() { 3016 dispatchMoveToState(Fragment.STOPPED); 3017 } 3018 3019 public void dispatchDestroyView() { 3020 dispatchMoveToState(Fragment.CREATED); 3021 } 3022 3023 public void dispatchDestroy() { 3024 mDestroyed = true; 3025 execPendingActions(); 3026 dispatchMoveToState(Fragment.INITIALIZING); 3027 mHost = null; 3028 mContainer = null; 3029 mParent = null; 3030 } 3031 3032 /** 3033 * This method is called by dispatch* methods to change the FragmentManager's state. 3034 * It calls moveToState directly if the target SDK is older than O. Otherwise, it sets and 3035 * clears mExecutingActions to ensure that there is no reentrancy while the 3036 * FragmentManager is changing state. 3037 * 3038 * @param state The new state of the FragmentManager. 3039 */ 3040 private void dispatchMoveToState(int state) { 3041 if (mAllowOldReentrantBehavior) { 3042 moveToState(state, false); 3043 } else { 3044 try { 3045 mExecutingActions = true; 3046 moveToState(state, false); 3047 } finally { 3048 mExecutingActions = false; 3049 } 3050 } 3051 execPendingActions(); 3052 } 3053 3054 /** 3055 * @deprecated use {@link #dispatchMultiWindowModeChanged(boolean, Configuration)} 3056 */ 3057 @Deprecated 3058 public void dispatchMultiWindowModeChanged(boolean isInMultiWindowMode) { 3059 for (int i = mAdded.size() - 1; i >= 0; --i) { 3060 final Fragment f = mAdded.get(i); 3061 if (f != null) { 3062 f.performMultiWindowModeChanged(isInMultiWindowMode); 3063 } 3064 } 3065 } 3066 3067 public void dispatchMultiWindowModeChanged(boolean isInMultiWindowMode, 3068 Configuration newConfig) { 3069 for (int i = mAdded.size() - 1; i >= 0; --i) { 3070 final Fragment f = mAdded.get(i); 3071 if (f != null) { 3072 f.performMultiWindowModeChanged(isInMultiWindowMode, newConfig); 3073 } 3074 } 3075 } 3076 3077 /** 3078 * @deprecated use {@link #dispatchPictureInPictureModeChanged(boolean, Configuration)} 3079 */ 3080 @Deprecated 3081 public void dispatchPictureInPictureModeChanged(boolean isInPictureInPictureMode) { 3082 for (int i = mAdded.size() - 1; i >= 0; --i) { 3083 final Fragment f = mAdded.get(i); 3084 if (f != null) { 3085 f.performPictureInPictureModeChanged(isInPictureInPictureMode); 3086 } 3087 } 3088 } 3089 3090 public void dispatchPictureInPictureModeChanged(boolean isInPictureInPictureMode, 3091 Configuration newConfig) { 3092 for (int i = mAdded.size() - 1; i >= 0; --i) { 3093 final Fragment f = mAdded.get(i); 3094 if (f != null) { 3095 f.performPictureInPictureModeChanged(isInPictureInPictureMode, newConfig); 3096 } 3097 } 3098 } 3099 3100 public void dispatchConfigurationChanged(Configuration newConfig) { 3101 for (int i = 0; i < mAdded.size(); i++) { 3102 Fragment f = mAdded.get(i); 3103 if (f != null) { 3104 f.performConfigurationChanged(newConfig); 3105 } 3106 } 3107 } 3108 3109 public void dispatchLowMemory() { 3110 for (int i = 0; i < mAdded.size(); i++) { 3111 Fragment f = mAdded.get(i); 3112 if (f != null) { 3113 f.performLowMemory(); 3114 } 3115 } 3116 } 3117 3118 public void dispatchTrimMemory(int level) { 3119 for (int i = 0; i < mAdded.size(); i++) { 3120 Fragment f = mAdded.get(i); 3121 if (f != null) { 3122 f.performTrimMemory(level); 3123 } 3124 } 3125 } 3126 3127 public boolean dispatchCreateOptionsMenu(Menu menu, MenuInflater inflater) { 3128 if (mCurState < Fragment.CREATED) { 3129 return false; 3130 } 3131 boolean show = false; 3132 ArrayList<Fragment> newMenus = null; 3133 for (int i = 0; i < mAdded.size(); i++) { 3134 Fragment f = mAdded.get(i); 3135 if (f != null) { 3136 if (f.performCreateOptionsMenu(menu, inflater)) { 3137 show = true; 3138 if (newMenus == null) { 3139 newMenus = new ArrayList<Fragment>(); 3140 } 3141 newMenus.add(f); 3142 } 3143 } 3144 } 3145 3146 if (mCreatedMenus != null) { 3147 for (int i=0; i<mCreatedMenus.size(); i++) { 3148 Fragment f = mCreatedMenus.get(i); 3149 if (newMenus == null || !newMenus.contains(f)) { 3150 f.onDestroyOptionsMenu(); 3151 } 3152 } 3153 } 3154 3155 mCreatedMenus = newMenus; 3156 3157 return show; 3158 } 3159 3160 public boolean dispatchPrepareOptionsMenu(Menu menu) { 3161 if (mCurState < Fragment.CREATED) { 3162 return false; 3163 } 3164 boolean show = false; 3165 for (int i = 0; i < mAdded.size(); i++) { 3166 Fragment f = mAdded.get(i); 3167 if (f != null) { 3168 if (f.performPrepareOptionsMenu(menu)) { 3169 show = true; 3170 } 3171 } 3172 } 3173 return show; 3174 } 3175 3176 public boolean dispatchOptionsItemSelected(MenuItem item) { 3177 if (mCurState < Fragment.CREATED) { 3178 return false; 3179 } 3180 for (int i = 0; i < mAdded.size(); i++) { 3181 Fragment f = mAdded.get(i); 3182 if (f != null) { 3183 if (f.performOptionsItemSelected(item)) { 3184 return true; 3185 } 3186 } 3187 } 3188 return false; 3189 } 3190 3191 public boolean dispatchContextItemSelected(MenuItem item) { 3192 if (mCurState < Fragment.CREATED) { 3193 return false; 3194 } 3195 for (int i = 0; i < mAdded.size(); i++) { 3196 Fragment f = mAdded.get(i); 3197 if (f != null) { 3198 if (f.performContextItemSelected(item)) { 3199 return true; 3200 } 3201 } 3202 } 3203 return false; 3204 } 3205 3206 public void dispatchOptionsMenuClosed(Menu menu) { 3207 if (mCurState < Fragment.CREATED) { 3208 return; 3209 } 3210 for (int i = 0; i < mAdded.size(); i++) { 3211 Fragment f = mAdded.get(i); 3212 if (f != null) { 3213 f.performOptionsMenuClosed(menu); 3214 } 3215 } 3216 } 3217 3218 @SuppressWarnings("ReferenceEquality") 3219 public void setPrimaryNavigationFragment(Fragment f) { 3220 if (f != null && (mActive.get(f.mIndex) != f 3221 || (f.mHost != null && f.getFragmentManager() != this))) { 3222 throw new IllegalArgumentException("Fragment " + f 3223 + " is not an active fragment of FragmentManager " + this); 3224 } 3225 mPrimaryNav = f; 3226 } 3227 3228 public Fragment getPrimaryNavigationFragment() { 3229 return mPrimaryNav; 3230 } 3231 3232 public void registerFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb, 3233 boolean recursive) { 3234 mLifecycleCallbacks.add(new Pair<>(cb, recursive)); 3235 } 3236 3237 public void unregisterFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb) { 3238 synchronized (mLifecycleCallbacks) { 3239 for (int i = 0, N = mLifecycleCallbacks.size(); i < N; i++) { 3240 if (mLifecycleCallbacks.get(i).first == cb) { 3241 mLifecycleCallbacks.remove(i); 3242 break; 3243 } 3244 } 3245 } 3246 } 3247 3248 void dispatchOnFragmentPreAttached(Fragment f, Context context, boolean onlyRecursive) { 3249 if (mParent != null) { 3250 FragmentManager parentManager = mParent.getFragmentManager(); 3251 if (parentManager instanceof FragmentManagerImpl) { 3252 ((FragmentManagerImpl) parentManager) 3253 .dispatchOnFragmentPreAttached(f, context, true); 3254 } 3255 } 3256 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3257 if (!onlyRecursive || p.second) { 3258 p.first.onFragmentPreAttached(this, f, context); 3259 } 3260 } 3261 } 3262 3263 void dispatchOnFragmentAttached(Fragment f, Context context, boolean onlyRecursive) { 3264 if (mParent != null) { 3265 FragmentManager parentManager = mParent.getFragmentManager(); 3266 if (parentManager instanceof FragmentManagerImpl) { 3267 ((FragmentManagerImpl) parentManager) 3268 .dispatchOnFragmentAttached(f, context, true); 3269 } 3270 } 3271 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3272 if (!onlyRecursive || p.second) { 3273 p.first.onFragmentAttached(this, f, context); 3274 } 3275 } 3276 } 3277 3278 void dispatchOnFragmentPreCreated(Fragment f, Bundle savedInstanceState, 3279 boolean onlyRecursive) { 3280 if (mParent != null) { 3281 FragmentManager parentManager = mParent.getFragmentManager(); 3282 if (parentManager instanceof FragmentManagerImpl) { 3283 ((FragmentManagerImpl) parentManager) 3284 .dispatchOnFragmentPreCreated(f, savedInstanceState, true); 3285 } 3286 } 3287 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3288 if (!onlyRecursive || p.second) { 3289 p.first.onFragmentPreCreated(this, f, savedInstanceState); 3290 } 3291 } 3292 } 3293 3294 void dispatchOnFragmentCreated(Fragment f, Bundle savedInstanceState, boolean onlyRecursive) { 3295 if (mParent != null) { 3296 FragmentManager parentManager = mParent.getFragmentManager(); 3297 if (parentManager instanceof FragmentManagerImpl) { 3298 ((FragmentManagerImpl) parentManager) 3299 .dispatchOnFragmentCreated(f, savedInstanceState, true); 3300 } 3301 } 3302 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3303 if (!onlyRecursive || p.second) { 3304 p.first.onFragmentCreated(this, f, savedInstanceState); 3305 } 3306 } 3307 } 3308 3309 void dispatchOnFragmentActivityCreated(Fragment f, Bundle savedInstanceState, 3310 boolean onlyRecursive) { 3311 if (mParent != null) { 3312 FragmentManager parentManager = mParent.getFragmentManager(); 3313 if (parentManager instanceof FragmentManagerImpl) { 3314 ((FragmentManagerImpl) parentManager) 3315 .dispatchOnFragmentActivityCreated(f, savedInstanceState, true); 3316 } 3317 } 3318 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3319 if (!onlyRecursive || p.second) { 3320 p.first.onFragmentActivityCreated(this, f, savedInstanceState); 3321 } 3322 } 3323 } 3324 3325 void dispatchOnFragmentViewCreated(Fragment f, View v, Bundle savedInstanceState, 3326 boolean onlyRecursive) { 3327 if (mParent != null) { 3328 FragmentManager parentManager = mParent.getFragmentManager(); 3329 if (parentManager instanceof FragmentManagerImpl) { 3330 ((FragmentManagerImpl) parentManager) 3331 .dispatchOnFragmentViewCreated(f, v, savedInstanceState, true); 3332 } 3333 } 3334 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3335 if (!onlyRecursive || p.second) { 3336 p.first.onFragmentViewCreated(this, f, v, savedInstanceState); 3337 } 3338 } 3339 } 3340 3341 void dispatchOnFragmentStarted(Fragment f, boolean onlyRecursive) { 3342 if (mParent != null) { 3343 FragmentManager parentManager = mParent.getFragmentManager(); 3344 if (parentManager instanceof FragmentManagerImpl) { 3345 ((FragmentManagerImpl) parentManager) 3346 .dispatchOnFragmentStarted(f, true); 3347 } 3348 } 3349 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3350 if (!onlyRecursive || p.second) { 3351 p.first.onFragmentStarted(this, f); 3352 } 3353 } 3354 } 3355 3356 void dispatchOnFragmentResumed(Fragment f, boolean onlyRecursive) { 3357 if (mParent != null) { 3358 FragmentManager parentManager = mParent.getFragmentManager(); 3359 if (parentManager instanceof FragmentManagerImpl) { 3360 ((FragmentManagerImpl) parentManager) 3361 .dispatchOnFragmentResumed(f, true); 3362 } 3363 } 3364 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3365 if (!onlyRecursive || p.second) { 3366 p.first.onFragmentResumed(this, f); 3367 } 3368 } 3369 } 3370 3371 void dispatchOnFragmentPaused(Fragment f, boolean onlyRecursive) { 3372 if (mParent != null) { 3373 FragmentManager parentManager = mParent.getFragmentManager(); 3374 if (parentManager instanceof FragmentManagerImpl) { 3375 ((FragmentManagerImpl) parentManager) 3376 .dispatchOnFragmentPaused(f, true); 3377 } 3378 } 3379 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3380 if (!onlyRecursive || p.second) { 3381 p.first.onFragmentPaused(this, f); 3382 } 3383 } 3384 } 3385 3386 void dispatchOnFragmentStopped(Fragment f, boolean onlyRecursive) { 3387 if (mParent != null) { 3388 FragmentManager parentManager = mParent.getFragmentManager(); 3389 if (parentManager instanceof FragmentManagerImpl) { 3390 ((FragmentManagerImpl) parentManager) 3391 .dispatchOnFragmentStopped(f, true); 3392 } 3393 } 3394 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3395 if (!onlyRecursive || p.second) { 3396 p.first.onFragmentStopped(this, f); 3397 } 3398 } 3399 } 3400 3401 void dispatchOnFragmentSaveInstanceState(Fragment f, Bundle outState, boolean onlyRecursive) { 3402 if (mParent != null) { 3403 FragmentManager parentManager = mParent.getFragmentManager(); 3404 if (parentManager instanceof FragmentManagerImpl) { 3405 ((FragmentManagerImpl) parentManager) 3406 .dispatchOnFragmentSaveInstanceState(f, outState, true); 3407 } 3408 } 3409 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3410 if (!onlyRecursive || p.second) { 3411 p.first.onFragmentSaveInstanceState(this, f, outState); 3412 } 3413 } 3414 } 3415 3416 void dispatchOnFragmentViewDestroyed(Fragment f, boolean onlyRecursive) { 3417 if (mParent != null) { 3418 FragmentManager parentManager = mParent.getFragmentManager(); 3419 if (parentManager instanceof FragmentManagerImpl) { 3420 ((FragmentManagerImpl) parentManager) 3421 .dispatchOnFragmentViewDestroyed(f, true); 3422 } 3423 } 3424 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3425 if (!onlyRecursive || p.second) { 3426 p.first.onFragmentViewDestroyed(this, f); 3427 } 3428 } 3429 } 3430 3431 void dispatchOnFragmentDestroyed(Fragment f, boolean onlyRecursive) { 3432 if (mParent != null) { 3433 FragmentManager parentManager = mParent.getFragmentManager(); 3434 if (parentManager instanceof FragmentManagerImpl) { 3435 ((FragmentManagerImpl) parentManager) 3436 .dispatchOnFragmentDestroyed(f, true); 3437 } 3438 } 3439 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3440 if (!onlyRecursive || p.second) { 3441 p.first.onFragmentDestroyed(this, f); 3442 } 3443 } 3444 } 3445 3446 void dispatchOnFragmentDetached(Fragment f, boolean onlyRecursive) { 3447 if (mParent != null) { 3448 FragmentManager parentManager = mParent.getFragmentManager(); 3449 if (parentManager instanceof FragmentManagerImpl) { 3450 ((FragmentManagerImpl) parentManager) 3451 .dispatchOnFragmentDetached(f, true); 3452 } 3453 } 3454 for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { 3455 if (!onlyRecursive || p.second) { 3456 p.first.onFragmentDetached(this, f); 3457 } 3458 } 3459 } 3460 3461 @Override 3462 public void invalidateOptionsMenu() { 3463 if (mHost != null && mCurState == Fragment.RESUMED) { 3464 mHost.onInvalidateOptionsMenu(); 3465 } else { 3466 mNeedMenuInvalidate = true; 3467 } 3468 } 3469 3470 public static int reverseTransit(int transit) { 3471 int rev = 0; 3472 switch (transit) { 3473 case FragmentTransaction.TRANSIT_FRAGMENT_OPEN: 3474 rev = FragmentTransaction.TRANSIT_FRAGMENT_CLOSE; 3475 break; 3476 case FragmentTransaction.TRANSIT_FRAGMENT_CLOSE: 3477 rev = FragmentTransaction.TRANSIT_FRAGMENT_OPEN; 3478 break; 3479 case FragmentTransaction.TRANSIT_FRAGMENT_FADE: 3480 rev = FragmentTransaction.TRANSIT_FRAGMENT_FADE; 3481 break; 3482 } 3483 return rev; 3484 3485 } 3486 3487 public static int transitToStyleIndex(int transit, boolean enter) { 3488 int animAttr = -1; 3489 switch (transit) { 3490 case FragmentTransaction.TRANSIT_FRAGMENT_OPEN: 3491 animAttr = enter 3492 ? com.android.internal.R.styleable.FragmentAnimation_fragmentOpenEnterAnimation 3493 : com.android.internal.R.styleable.FragmentAnimation_fragmentOpenExitAnimation; 3494 break; 3495 case FragmentTransaction.TRANSIT_FRAGMENT_CLOSE: 3496 animAttr = enter 3497 ? com.android.internal.R.styleable.FragmentAnimation_fragmentCloseEnterAnimation 3498 : com.android.internal.R.styleable.FragmentAnimation_fragmentCloseExitAnimation; 3499 break; 3500 case FragmentTransaction.TRANSIT_FRAGMENT_FADE: 3501 animAttr = enter 3502 ? com.android.internal.R.styleable.FragmentAnimation_fragmentFadeEnterAnimation 3503 : com.android.internal.R.styleable.FragmentAnimation_fragmentFadeExitAnimation; 3504 break; 3505 } 3506 return animAttr; 3507 } 3508 3509 @Override 3510 public View onCreateView(View parent, String name, Context context, AttributeSet attrs) { 3511 if (!"fragment".equals(name)) { 3512 return null; 3513 } 3514 3515 String fname = attrs.getAttributeValue(null, "class"); 3516 TypedArray a = 3517 context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.Fragment); 3518 if (fname == null) { 3519 fname = a.getString(com.android.internal.R.styleable.Fragment_name); 3520 } 3521 int id = a.getResourceId(com.android.internal.R.styleable.Fragment_id, View.NO_ID); 3522 String tag = a.getString(com.android.internal.R.styleable.Fragment_tag); 3523 a.recycle(); 3524 3525 int containerId = parent != null ? parent.getId() : 0; 3526 if (containerId == View.NO_ID && id == View.NO_ID && tag == null) { 3527 throw new IllegalArgumentException(attrs.getPositionDescription() 3528 + ": Must specify unique android:id, android:tag, or have a parent with" 3529 + " an id for " + fname); 3530 } 3531 3532 // If we restored from a previous state, we may already have 3533 // instantiated this fragment from the state and should use 3534 // that instance instead of making a new one. 3535 Fragment fragment = id != View.NO_ID ? findFragmentById(id) : null; 3536 if (fragment == null && tag != null) { 3537 fragment = findFragmentByTag(tag); 3538 } 3539 if (fragment == null && containerId != View.NO_ID) { 3540 fragment = findFragmentById(containerId); 3541 } 3542 3543 if (FragmentManagerImpl.DEBUG) Log.v(TAG, "onCreateView: id=0x" 3544 + Integer.toHexString(id) + " fname=" + fname 3545 + " existing=" + fragment); 3546 if (fragment == null) { 3547 fragment = mContainer.instantiate(context, fname, null); 3548 fragment.mFromLayout = true; 3549 fragment.mFragmentId = id != 0 ? id : containerId; 3550 fragment.mContainerId = containerId; 3551 fragment.mTag = tag; 3552 fragment.mInLayout = true; 3553 fragment.mFragmentManager = this; 3554 fragment.mHost = mHost; 3555 fragment.onInflate(mHost.getContext(), attrs, fragment.mSavedFragmentState); 3556 addFragment(fragment, true); 3557 } else if (fragment.mInLayout) { 3558 // A fragment already exists and it is not one we restored from 3559 // previous state. 3560 throw new IllegalArgumentException(attrs.getPositionDescription() 3561 + ": Duplicate id 0x" + Integer.toHexString(id) 3562 + ", tag " + tag + ", or parent id 0x" + Integer.toHexString(containerId) 3563 + " with another fragment for " + fname); 3564 } else { 3565 // This fragment was retained from a previous instance; get it 3566 // going now. 3567 fragment.mInLayout = true; 3568 fragment.mHost = mHost; 3569 // If this fragment is newly instantiated (either right now, or 3570 // from last saved state), then give it the attributes to 3571 // initialize itself. 3572 if (!fragment.mRetaining) { 3573 fragment.onInflate(mHost.getContext(), attrs, fragment.mSavedFragmentState); 3574 } 3575 } 3576 3577 // If we haven't finished entering the CREATED state ourselves yet, 3578 // push the inflated child fragment along. This will ensureInflatedFragmentView 3579 // at the right phase of the lifecycle so that we will have mView populated 3580 // for compliant fragments below. 3581 if (mCurState < Fragment.CREATED && fragment.mFromLayout) { 3582 moveToState(fragment, Fragment.CREATED, 0, 0, false); 3583 } else { 3584 moveToState(fragment); 3585 } 3586 3587 if (fragment.mView == null) { 3588 throw new IllegalStateException("Fragment " + fname 3589 + " did not create a view."); 3590 } 3591 if (id != 0) { 3592 fragment.mView.setId(id); 3593 } 3594 if (fragment.mView.getTag() == null) { 3595 fragment.mView.setTag(tag); 3596 } 3597 return fragment.mView; 3598 } 3599 3600 @Override 3601 public View onCreateView(String name, Context context, AttributeSet attrs) { 3602 return null; 3603 } 3604 3605 LayoutInflater.Factory2 getLayoutInflaterFactory() { 3606 return this; 3607 } 3608 3609 /** 3610 * An add or pop transaction to be scheduled for the UI thread. 3611 */ 3612 interface OpGenerator { 3613 /** 3614 * Generate transactions to add to {@code records} and whether or not the transaction is 3615 * an add or pop to {@code isRecordPop}. 3616 * 3617 * records and isRecordPop must be added equally so that each transaction in records 3618 * matches the boolean for whether or not it is a pop in isRecordPop. 3619 * 3620 * @param records A list to add transactions to. 3621 * @param isRecordPop A list to add whether or not the transactions added to records is 3622 * a pop transaction. 3623 * @return true if something was added or false otherwise. 3624 */ 3625 boolean generateOps(ArrayList<BackStackRecord> records, ArrayList<Boolean> isRecordPop); 3626 } 3627 3628 /** 3629 * A pop operation OpGenerator. This will be run on the UI thread and will generate the 3630 * transactions that will be popped if anything can be popped. 3631 */ 3632 private class PopBackStackState implements OpGenerator { 3633 final String mName; 3634 final int mId; 3635 final int mFlags; 3636 3637 public PopBackStackState(String name, int id, int flags) { 3638 mName = name; 3639 mId = id; 3640 mFlags = flags; 3641 } 3642 3643 @Override 3644 public boolean generateOps(ArrayList<BackStackRecord> records, 3645 ArrayList<Boolean> isRecordPop) { 3646 if (mPrimaryNav != null // We have a primary nav fragment 3647 && mId < 0 // No valid id (since they're local) 3648 && mName == null) { // no name to pop to (since they're local) 3649 final FragmentManager childManager = mPrimaryNav.mChildFragmentManager; 3650 if (childManager != null && childManager.popBackStackImmediate()) { 3651 // We didn't add any operations for this FragmentManager even though 3652 // a child did do work. 3653 return false; 3654 } 3655 } 3656 return popBackStackState(records, isRecordPop, mName, mId, mFlags); 3657 } 3658 } 3659 3660 /** 3661 * A listener for a postponed transaction. This waits until 3662 * {@link Fragment#startPostponedEnterTransition()} is called or a transaction is started 3663 * that interacts with this one, based on interactions with the fragment container. 3664 */ 3665 static class StartEnterTransitionListener 3666 implements Fragment.OnStartEnterTransitionListener { 3667 private final boolean mIsBack; 3668 private final BackStackRecord mRecord; 3669 private int mNumPostponed; 3670 3671 public StartEnterTransitionListener(BackStackRecord record, boolean isBack) { 3672 mIsBack = isBack; 3673 mRecord = record; 3674 } 3675 3676 /** 3677 * Called from {@link Fragment#startPostponedEnterTransition()}, this decreases the 3678 * number of Fragments that are postponed. This may cause the transaction to schedule 3679 * to finish running and run transitions and animations. 3680 */ 3681 @Override 3682 public void onStartEnterTransition() { 3683 mNumPostponed--; 3684 if (mNumPostponed != 0) { 3685 return; 3686 } 3687 mRecord.mManager.scheduleCommit(); 3688 } 3689 3690 /** 3691 * Called from {@link Fragment# 3692 * setOnStartEnterTransitionListener(Fragment.OnStartEnterTransitionListener)}, this 3693 * increases the number of fragments that are postponed as part of this transaction. 3694 */ 3695 @Override 3696 public void startListening() { 3697 mNumPostponed++; 3698 } 3699 3700 /** 3701 * @return true if there are no more postponed fragments as part of the transaction. 3702 */ 3703 public boolean isReady() { 3704 return mNumPostponed == 0; 3705 } 3706 3707 /** 3708 * Completes the transaction and start the animations and transitions. This may skip 3709 * the transitions if this is called before all fragments have called 3710 * {@link Fragment#startPostponedEnterTransition()}. 3711 */ 3712 public void completeTransaction() { 3713 final boolean canceled; 3714 canceled = mNumPostponed > 0; 3715 FragmentManagerImpl manager = mRecord.mManager; 3716 final int numAdded = manager.mAdded.size(); 3717 for (int i = 0; i < numAdded; i++) { 3718 final Fragment fragment = manager.mAdded.get(i); 3719 fragment.setOnStartEnterTransitionListener(null); 3720 if (canceled && fragment.isPostponed()) { 3721 fragment.startPostponedEnterTransition(); 3722 } 3723 } 3724 mRecord.mManager.completeExecute(mRecord, mIsBack, !canceled, true); 3725 } 3726 3727 /** 3728 * Cancels this transaction instead of completing it. That means that the state isn't 3729 * changed, so the pop results in no change to the state. 3730 */ 3731 public void cancelTransaction() { 3732 mRecord.mManager.completeExecute(mRecord, mIsBack, false, false); 3733 } 3734 } 3735} 3736