1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.support.v4.app; 18 19 import android.content.Context; 20 import android.content.res.Configuration; 21 import android.content.res.Resources.NotFoundException; 22 import android.content.res.TypedArray; 23 import android.os.Build; 24 import android.os.Bundle; 25 import android.os.Handler; 26 import android.os.Looper; 27 import android.os.Parcel; 28 import android.os.Parcelable; 29 import android.support.annotation.CallSuper; 30 import android.support.annotation.IdRes; 31 import android.support.annotation.StringRes; 32 import android.support.v4.os.BuildCompat; 33 import android.support.v4.util.DebugUtils; 34 import android.support.v4.util.LogWriter; 35 import android.support.v4.view.LayoutInflaterFactory; 36 import android.support.v4.view.ViewCompat; 37 import android.util.AttributeSet; 38 import android.util.Log; 39 import android.util.SparseArray; 40 import android.view.animation.AccelerateInterpolator; 41 import android.view.animation.AlphaAnimation; 42 import android.view.animation.Animation; 43 import android.view.animation.AnimationSet; 44 import android.view.animation.AnimationUtils; 45 import android.view.animation.DecelerateInterpolator; 46 import android.view.animation.Interpolator; 47 import android.view.animation.ScaleAnimation; 48 import android.view.animation.Animation.AnimationListener; 49 import android.view.Menu; 50 import android.view.MenuInflater; 51 import android.view.MenuItem; 52 import android.view.View; 53 import android.view.ViewGroup; 54 55 import java.io.FileDescriptor; 56 import java.io.PrintWriter; 57 import java.lang.reflect.Field; 58 import java.util.ArrayList; 59 import java.util.Arrays; 60 import java.util.List; 61 62 /** 63 * Static library support version of the framework's {@link android.app.FragmentManager}. 64 * Used to write apps that run on platforms prior to Android 3.0. When running 65 * on Android 3.0 or above, this implementation is still used; it does not try 66 * to switch to the framework's implementation. See the framework {@link FragmentManager} 67 * documentation for a class overview. 68 * 69 * <p>Your activity must derive from {@link FragmentActivity} to use this. From such an activity, 70 * you can acquire the {@link FragmentManager} by calling 71 * {@link FragmentActivity#getSupportFragmentManager}. 72 */ 73 public abstract class FragmentManager { 74 /** 75 * Representation of an entry on the fragment back stack, as created 76 * with {@link FragmentTransaction#addToBackStack(String) 77 * FragmentTransaction.addToBackStack()}. Entries can later be 78 * retrieved with {@link FragmentManager#getBackStackEntryAt(int) 79 * FragmentManager.getBackStackEntry()}. 80 * 81 * <p>Note that you should never hold on to a BackStackEntry object; 82 * the identifier as returned by {@link #getId} is the only thing that 83 * will be persisted across activity instances. 84 */ 85 public interface BackStackEntry { 86 /** 87 * Return the unique identifier for the entry. This is the only 88 * representation of the entry that will persist across activity 89 * instances. 90 */ getId()91 public int getId(); 92 93 /** 94 * Get the name that was supplied to 95 * {@link FragmentTransaction#addToBackStack(String) 96 * FragmentTransaction.addToBackStack(String)} when creating this entry. 97 */ getName()98 public String getName(); 99 100 /** 101 * Return the full bread crumb title resource identifier for the entry, 102 * or 0 if it does not have one. 103 */ 104 @StringRes getBreadCrumbTitleRes()105 public int getBreadCrumbTitleRes(); 106 107 /** 108 * Return the short bread crumb title resource identifier for the entry, 109 * or 0 if it does not have one. 110 */ 111 @StringRes getBreadCrumbShortTitleRes()112 public int getBreadCrumbShortTitleRes(); 113 114 /** 115 * Return the full bread crumb title for the entry, or null if it 116 * does not have one. 117 */ getBreadCrumbTitle()118 public CharSequence getBreadCrumbTitle(); 119 120 /** 121 * Return the short bread crumb title for the entry, or null if it 122 * does not have one. 123 */ getBreadCrumbShortTitle()124 public CharSequence getBreadCrumbShortTitle(); 125 } 126 127 /** 128 * Interface to watch for changes to the back stack. 129 */ 130 public interface OnBackStackChangedListener { 131 /** 132 * Called whenever the contents of the back stack change. 133 */ onBackStackChanged()134 public void onBackStackChanged(); 135 } 136 137 /** 138 * Start a series of edit operations on the Fragments associated with 139 * this FragmentManager. 140 * 141 * <p>Note: A fragment transaction can only be created/committed prior 142 * to an activity saving its state. If you try to commit a transaction 143 * after {@link FragmentActivity#onSaveInstanceState FragmentActivity.onSaveInstanceState()} 144 * (and prior to a following {@link FragmentActivity#onStart FragmentActivity.onStart} 145 * or {@link FragmentActivity#onResume FragmentActivity.onResume()}, you will get an error. 146 * This is because the framework takes care of saving your current fragments 147 * in the state, and if changes are made after the state is saved then they 148 * will be lost.</p> 149 */ beginTransaction()150 public abstract FragmentTransaction beginTransaction(); 151 152 /** 153 * @hide -- remove once prebuilts are in. 154 * @deprecated 155 */ 156 @Deprecated openTransaction()157 public FragmentTransaction openTransaction() { 158 return beginTransaction(); 159 } 160 161 /** 162 * After a {@link FragmentTransaction} is committed with 163 * {@link FragmentTransaction#commit FragmentTransaction.commit()}, it 164 * is scheduled to be executed asynchronously on the process's main thread. 165 * If you want to immediately executing any such pending operations, you 166 * can call this function (only from the main thread) to do so. Note that 167 * all callbacks and other related behavior will be done from within this 168 * call, so be careful about where this is called from. 169 * 170 * <p>If you are committing a single transaction that does not modify the 171 * fragment back stack, strongly consider using 172 * {@link FragmentTransaction#commitNow()} instead. This can help avoid 173 * unwanted side effects when other code in your app has pending committed 174 * transactions that expect different timing.</p> 175 * 176 * @return Returns true if there were any pending transactions to be 177 * executed. 178 */ executePendingTransactions()179 public abstract boolean executePendingTransactions(); 180 181 /** 182 * Finds a fragment that was identified by the given id either when inflated 183 * from XML or as the container ID when added in a transaction. This first 184 * searches through fragments that are currently added to the manager's 185 * activity; if no such fragment is found, then all fragments currently 186 * on the back stack associated with this ID are searched. 187 * @return The fragment if found or null otherwise. 188 */ findFragmentById(@dRes int id)189 public abstract Fragment findFragmentById(@IdRes int id); 190 191 /** 192 * Finds a fragment that was identified by the given tag either when inflated 193 * from XML or as supplied when added in a transaction. This first 194 * searches through fragments that are currently added to the manager's 195 * activity; if no such fragment is found, then all fragments currently 196 * on the back stack are searched. 197 * @return The fragment if found or null otherwise. 198 */ findFragmentByTag(String tag)199 public abstract Fragment findFragmentByTag(String tag); 200 201 /** 202 * Flag for {@link #popBackStack(String, int)} 203 * and {@link #popBackStack(int, int)}: If set, and the name or ID of 204 * a back stack entry has been supplied, then all matching entries will 205 * be consumed until one that doesn't match is found or the bottom of 206 * the stack is reached. Otherwise, all entries up to but not including that entry 207 * will be removed. 208 */ 209 public static final int POP_BACK_STACK_INCLUSIVE = 1<<0; 210 211 /** 212 * Pop the top state off the back stack. Returns true if there was one 213 * to pop, else false. This function is asynchronous -- it enqueues the 214 * request to pop, but the action will not be performed until the application 215 * returns to its event loop. 216 */ popBackStack()217 public abstract void popBackStack(); 218 219 /** 220 * Like {@link #popBackStack()}, but performs the operation immediately 221 * inside of the call. This is like calling {@link #executePendingTransactions()} 222 * afterwards. 223 * @return Returns true if there was something popped, else false. 224 */ popBackStackImmediate()225 public abstract boolean popBackStackImmediate(); 226 227 /** 228 * Pop the last fragment transition from the manager's fragment 229 * back stack. If there is nothing to pop, false is returned. 230 * This function is asynchronous -- it enqueues the 231 * request to pop, but the action will not be performed until the application 232 * returns to its event loop. 233 * 234 * @param name If non-null, this is the name of a previous back state 235 * to look for; if found, all states up to that state will be popped. The 236 * {@link #POP_BACK_STACK_INCLUSIVE} flag can be used to control whether 237 * the named state itself is popped. If null, only the top state is popped. 238 * @param flags Either 0 or {@link #POP_BACK_STACK_INCLUSIVE}. 239 */ popBackStack(String name, int flags)240 public abstract void popBackStack(String name, int flags); 241 242 /** 243 * Like {@link #popBackStack(String, int)}, but performs the operation immediately 244 * inside of the call. This is like calling {@link #executePendingTransactions()} 245 * afterwards. 246 * @return Returns true if there was something popped, else false. 247 */ popBackStackImmediate(String name, int flags)248 public abstract boolean popBackStackImmediate(String name, int flags); 249 250 /** 251 * Pop all back stack states up to the one with the given identifier. 252 * This function is asynchronous -- it enqueues the 253 * request to pop, but the action will not be performed until the application 254 * returns to its event loop. 255 * 256 * @param id Identifier of the stated to be popped. If no identifier exists, 257 * false is returned. 258 * The identifier is the number returned by 259 * {@link FragmentTransaction#commit() FragmentTransaction.commit()}. The 260 * {@link #POP_BACK_STACK_INCLUSIVE} flag can be used to control whether 261 * the named state itself is popped. 262 * @param flags Either 0 or {@link #POP_BACK_STACK_INCLUSIVE}. 263 */ popBackStack(int id, int flags)264 public abstract void popBackStack(int id, int flags); 265 266 /** 267 * Like {@link #popBackStack(int, int)}, but performs the operation immediately 268 * inside of the call. This is like calling {@link #executePendingTransactions()} 269 * afterwards. 270 * @return Returns true if there was something popped, else false. 271 */ popBackStackImmediate(int id, int flags)272 public abstract boolean popBackStackImmediate(int id, int flags); 273 274 /** 275 * Return the number of entries currently in the back stack. 276 */ getBackStackEntryCount()277 public abstract int getBackStackEntryCount(); 278 279 /** 280 * Return the BackStackEntry at index <var>index</var> in the back stack; 281 * entries start index 0 being the bottom of the stack. 282 */ getBackStackEntryAt(int index)283 public abstract BackStackEntry getBackStackEntryAt(int index); 284 285 /** 286 * Add a new listener for changes to the fragment back stack. 287 */ addOnBackStackChangedListener(OnBackStackChangedListener listener)288 public abstract void addOnBackStackChangedListener(OnBackStackChangedListener listener); 289 290 /** 291 * Remove a listener that was previously added with 292 * {@link #addOnBackStackChangedListener(OnBackStackChangedListener)}. 293 */ removeOnBackStackChangedListener(OnBackStackChangedListener listener)294 public abstract void removeOnBackStackChangedListener(OnBackStackChangedListener listener); 295 296 /** 297 * Put a reference to a fragment in a Bundle. This Bundle can be 298 * persisted as saved state, and when later restoring 299 * {@link #getFragment(Bundle, String)} will return the current 300 * instance of the same fragment. 301 * 302 * @param bundle The bundle in which to put the fragment reference. 303 * @param key The name of the entry in the bundle. 304 * @param fragment The Fragment whose reference is to be stored. 305 */ putFragment(Bundle bundle, String key, Fragment fragment)306 public abstract void putFragment(Bundle bundle, String key, Fragment fragment); 307 308 /** 309 * Retrieve the current Fragment instance for a reference previously 310 * placed with {@link #putFragment(Bundle, String, Fragment)}. 311 * 312 * @param bundle The bundle from which to retrieve the fragment reference. 313 * @param key The name of the entry in the bundle. 314 * @return Returns the current Fragment instance that is associated with 315 * the given reference. 316 */ getFragment(Bundle bundle, String key)317 public abstract Fragment getFragment(Bundle bundle, String key); 318 319 /** 320 * Get a list of all fragments that have been added to the fragment manager. 321 * 322 * @return The list of all fragments or null if none. 323 * @hide 324 */ getFragments()325 public abstract List<Fragment> getFragments(); 326 327 /** 328 * Save the current instance state of the given Fragment. This can be 329 * used later when creating a new instance of the Fragment and adding 330 * it to the fragment manager, to have it create itself to match the 331 * current state returned here. Note that there are limits on how 332 * this can be used: 333 * 334 * <ul> 335 * <li>The Fragment must currently be attached to the FragmentManager. 336 * <li>A new Fragment created using this saved state must be the same class 337 * type as the Fragment it was created from. 338 * <li>The saved state can not contain dependencies on other fragments -- 339 * that is it can't use {@link #putFragment(Bundle, String, Fragment)} to 340 * store a fragment reference because that reference may not be valid when 341 * this saved state is later used. Likewise the Fragment's target and 342 * result code are not included in this state. 343 * </ul> 344 * 345 * @param f The Fragment whose state is to be saved. 346 * @return The generated state. This will be null if there was no 347 * interesting state created by the fragment. 348 */ saveFragmentInstanceState(Fragment f)349 public abstract Fragment.SavedState saveFragmentInstanceState(Fragment f); 350 351 /** 352 * Returns true if the final {@link android.app.Activity#onDestroy() Activity.onDestroy()} 353 * call has been made on the FragmentManager's Activity, so this instance is now dead. 354 */ isDestroyed()355 public abstract boolean isDestroyed(); 356 357 /** 358 * Print the FragmentManager's state into the given stream. 359 * 360 * @param prefix Text to print at the front of each line. 361 * @param fd The raw file descriptor that the dump is being sent to. 362 * @param writer A PrintWriter to which the dump is to be set. 363 * @param args Additional arguments to the dump request. 364 */ dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args)365 public abstract void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args); 366 367 /** 368 * Control whether the framework's internal fragment manager debugging 369 * logs are turned on. If enabled, you will see output in logcat as 370 * the framework performs fragment operations. 371 */ enableDebugLogging(boolean enabled)372 public static void enableDebugLogging(boolean enabled) { 373 FragmentManagerImpl.DEBUG = enabled; 374 } 375 } 376 377 final class FragmentManagerState implements Parcelable { 378 FragmentState[] mActive; 379 int[] mAdded; 380 BackStackState[] mBackStack; 381 FragmentManagerState()382 public FragmentManagerState() { 383 } 384 FragmentManagerState(Parcel in)385 public FragmentManagerState(Parcel in) { 386 mActive = in.createTypedArray(FragmentState.CREATOR); 387 mAdded = in.createIntArray(); 388 mBackStack = in.createTypedArray(BackStackState.CREATOR); 389 } 390 391 @Override describeContents()392 public int describeContents() { 393 return 0; 394 } 395 396 @Override writeToParcel(Parcel dest, int flags)397 public void writeToParcel(Parcel dest, int flags) { 398 dest.writeTypedArray(mActive, flags); 399 dest.writeIntArray(mAdded); 400 dest.writeTypedArray(mBackStack, flags); 401 } 402 403 public static final Parcelable.Creator<FragmentManagerState> CREATOR 404 = new Parcelable.Creator<FragmentManagerState>() { 405 @Override 406 public FragmentManagerState createFromParcel(Parcel in) { 407 return new FragmentManagerState(in); 408 } 409 410 @Override 411 public FragmentManagerState[] newArray(int size) { 412 return new FragmentManagerState[size]; 413 } 414 }; 415 } 416 417 /** 418 * Container for fragments associated with an activity. 419 */ 420 final class FragmentManagerImpl extends FragmentManager implements LayoutInflaterFactory { 421 static boolean DEBUG = false; 422 static final String TAG = "FragmentManager"; 423 424 static final boolean HONEYCOMB = android.os.Build.VERSION.SDK_INT >= 11; 425 426 static final String TARGET_REQUEST_CODE_STATE_TAG = "android:target_req_state"; 427 static final String TARGET_STATE_TAG = "android:target_state"; 428 static final String VIEW_STATE_TAG = "android:view_state"; 429 static final String USER_VISIBLE_HINT_TAG = "android:user_visible_hint"; 430 431 static class AnimateOnHWLayerIfNeededListener implements AnimationListener { 432 private AnimationListener mOriginalListener; 433 private boolean mShouldRunOnHWLayer; 434 private View mView; 435 AnimateOnHWLayerIfNeededListener(final View v, Animation anim)436 public AnimateOnHWLayerIfNeededListener(final View v, Animation anim) { 437 if (v == null || anim == null) { 438 return; 439 } 440 mView = v; 441 } 442 AnimateOnHWLayerIfNeededListener(final View v, Animation anim, AnimationListener listener)443 public AnimateOnHWLayerIfNeededListener(final View v, Animation anim, 444 AnimationListener listener) { 445 if (v == null || anim == null) { 446 return; 447 } 448 mOriginalListener = listener; 449 mView = v; 450 mShouldRunOnHWLayer = true; 451 } 452 453 @Override 454 @CallSuper onAnimationStart(Animation animation)455 public void onAnimationStart(Animation animation) { 456 if (mOriginalListener != null) { 457 mOriginalListener.onAnimationStart(animation); 458 } 459 } 460 461 @Override 462 @CallSuper onAnimationEnd(Animation animation)463 public void onAnimationEnd(Animation animation) { 464 if (mView != null && mShouldRunOnHWLayer) { 465 // If we're attached to a window, assume we're in the normal performTraversals 466 // drawing path for Animations running. It's not safe to change the layer type 467 // during drawing, so post it to the View to run later. If we're not attached 468 // or we're running on N and above, post it to the view. If we're not on N and 469 // not attached, do it right now since existing platform versions don't run the 470 // hwui renderer for detached views off the UI thread making changing layer type 471 // safe, but posting may not be. 472 // Prior to N posting to a detached view from a non-Looper thread could cause 473 // leaks, since the thread-local run queue on a non-Looper thread would never 474 // be flushed. 475 if (ViewCompat.isAttachedToWindow(mView) || BuildCompat.isAtLeastN()) { 476 mView.post(new Runnable() { 477 @Override 478 public void run() { 479 ViewCompat.setLayerType(mView, ViewCompat.LAYER_TYPE_NONE, null); 480 } 481 }); 482 } else { 483 ViewCompat.setLayerType(mView, ViewCompat.LAYER_TYPE_NONE, null); 484 } 485 } 486 if (mOriginalListener != null) { 487 mOriginalListener.onAnimationEnd(animation); 488 } 489 } 490 491 @Override onAnimationRepeat(Animation animation)492 public void onAnimationRepeat(Animation animation) { 493 if (mOriginalListener != null) { 494 mOriginalListener.onAnimationRepeat(animation); 495 } 496 } 497 } 498 499 ArrayList<Runnable> mPendingActions; 500 Runnable[] mTmpActions; 501 boolean mExecutingActions; 502 503 ArrayList<Fragment> mActive; 504 ArrayList<Fragment> mAdded; 505 ArrayList<Integer> mAvailIndices; 506 ArrayList<BackStackRecord> mBackStack; 507 ArrayList<Fragment> mCreatedMenus; 508 509 // Must be accessed while locked. 510 ArrayList<BackStackRecord> mBackStackIndices; 511 ArrayList<Integer> mAvailBackStackIndices; 512 513 ArrayList<OnBackStackChangedListener> mBackStackChangeListeners; 514 515 int mCurState = Fragment.INITIALIZING; 516 FragmentHostCallback mHost; 517 FragmentController mController; 518 FragmentContainer mContainer; 519 Fragment mParent; 520 521 static Field sAnimationListenerField = null; 522 523 boolean mNeedMenuInvalidate; 524 boolean mStateSaved; 525 boolean mDestroyed; 526 String mNoTransactionsBecause; 527 boolean mHavePendingDeferredStart; 528 529 // Temporary vars for state save and restore. 530 Bundle mStateBundle = null; 531 SparseArray<Parcelable> mStateArray = null; 532 533 Runnable mExecCommit = new Runnable() { 534 @Override 535 public void run() { 536 execPendingActions(); 537 } 538 }; 539 modifiesAlpha(Animation anim)540 static boolean modifiesAlpha(Animation anim) { 541 if (anim instanceof AlphaAnimation) { 542 return true; 543 } else if (anim instanceof AnimationSet) { 544 List<Animation> anims = ((AnimationSet) anim).getAnimations(); 545 for (int i = 0; i < anims.size(); i++) { 546 if (anims.get(i) instanceof AlphaAnimation) { 547 return true; 548 } 549 } 550 } 551 return false; 552 } 553 shouldRunOnHWLayer(View v, Animation anim)554 static boolean shouldRunOnHWLayer(View v, Animation anim) { 555 return Build.VERSION.SDK_INT >= 19 556 && ViewCompat.getLayerType(v) == ViewCompat.LAYER_TYPE_NONE 557 && ViewCompat.hasOverlappingRendering(v) 558 && modifiesAlpha(anim); 559 } 560 throwException(RuntimeException ex)561 private void throwException(RuntimeException ex) { 562 Log.e(TAG, ex.getMessage()); 563 Log.e(TAG, "Activity state:"); 564 LogWriter logw = new LogWriter(TAG); 565 PrintWriter pw = new PrintWriter(logw); 566 if (mHost != null) { 567 try { 568 mHost.onDump(" ", null, pw, new String[] { }); 569 } catch (Exception e) { 570 Log.e(TAG, "Failed dumping state", e); 571 } 572 } else { 573 try { 574 dump(" ", null, pw, new String[] { }); 575 } catch (Exception e) { 576 Log.e(TAG, "Failed dumping state", e); 577 } 578 } 579 throw ex; 580 } 581 582 @Override beginTransaction()583 public FragmentTransaction beginTransaction() { 584 return new BackStackRecord(this); 585 } 586 587 @Override executePendingTransactions()588 public boolean executePendingTransactions() { 589 return execPendingActions(); 590 } 591 592 @Override popBackStack()593 public void popBackStack() { 594 enqueueAction(new Runnable() { 595 @Override public void run() { 596 popBackStackState(mHost.getHandler(), null, -1, 0); 597 } 598 }, false); 599 } 600 601 @Override popBackStackImmediate()602 public boolean popBackStackImmediate() { 603 checkStateLoss(); 604 executePendingTransactions(); 605 return popBackStackState(mHost.getHandler(), null, -1, 0); 606 } 607 608 @Override popBackStack(final String name, final int flags)609 public void popBackStack(final String name, final int flags) { 610 enqueueAction(new Runnable() { 611 @Override public void run() { 612 popBackStackState(mHost.getHandler(), name, -1, flags); 613 } 614 }, false); 615 } 616 617 @Override popBackStackImmediate(String name, int flags)618 public boolean popBackStackImmediate(String name, int flags) { 619 checkStateLoss(); 620 executePendingTransactions(); 621 return popBackStackState(mHost.getHandler(), name, -1, flags); 622 } 623 624 @Override popBackStack(final int id, final int flags)625 public void popBackStack(final int id, final int flags) { 626 if (id < 0) { 627 throw new IllegalArgumentException("Bad id: " + id); 628 } 629 enqueueAction(new Runnable() { 630 @Override public void run() { 631 popBackStackState(mHost.getHandler(), null, id, flags); 632 } 633 }, false); 634 } 635 636 @Override popBackStackImmediate(int id, int flags)637 public boolean popBackStackImmediate(int id, int flags) { 638 checkStateLoss(); 639 executePendingTransactions(); 640 if (id < 0) { 641 throw new IllegalArgumentException("Bad id: " + id); 642 } 643 return popBackStackState(mHost.getHandler(), null, id, flags); 644 } 645 646 @Override getBackStackEntryCount()647 public int getBackStackEntryCount() { 648 return mBackStack != null ? mBackStack.size() : 0; 649 } 650 651 @Override getBackStackEntryAt(int index)652 public BackStackEntry getBackStackEntryAt(int index) { 653 return mBackStack.get(index); 654 } 655 656 @Override addOnBackStackChangedListener(OnBackStackChangedListener listener)657 public void addOnBackStackChangedListener(OnBackStackChangedListener listener) { 658 if (mBackStackChangeListeners == null) { 659 mBackStackChangeListeners = new ArrayList<OnBackStackChangedListener>(); 660 } 661 mBackStackChangeListeners.add(listener); 662 } 663 664 @Override removeOnBackStackChangedListener(OnBackStackChangedListener listener)665 public void removeOnBackStackChangedListener(OnBackStackChangedListener listener) { 666 if (mBackStackChangeListeners != null) { 667 mBackStackChangeListeners.remove(listener); 668 } 669 } 670 671 @Override putFragment(Bundle bundle, String key, Fragment fragment)672 public void putFragment(Bundle bundle, String key, Fragment fragment) { 673 if (fragment.mIndex < 0) { 674 throwException(new IllegalStateException("Fragment " + fragment 675 + " is not currently in the FragmentManager")); 676 } 677 bundle.putInt(key, fragment.mIndex); 678 } 679 680 @Override getFragment(Bundle bundle, String key)681 public Fragment getFragment(Bundle bundle, String key) { 682 int index = bundle.getInt(key, -1); 683 if (index == -1) { 684 return null; 685 } 686 if (index >= mActive.size()) { 687 throwException(new IllegalStateException("Fragment no longer exists for key " 688 + key + ": index " + index)); 689 } 690 Fragment f = mActive.get(index); 691 if (f == null) { 692 throwException(new IllegalStateException("Fragment no longer exists for key " 693 + key + ": index " + index)); 694 } 695 return f; 696 } 697 698 @Override getFragments()699 public List<Fragment> getFragments() { 700 return mActive; 701 } 702 703 @Override saveFragmentInstanceState(Fragment fragment)704 public Fragment.SavedState saveFragmentInstanceState(Fragment fragment) { 705 if (fragment.mIndex < 0) { 706 throwException( new IllegalStateException("Fragment " + fragment 707 + " is not currently in the FragmentManager")); 708 } 709 if (fragment.mState > Fragment.INITIALIZING) { 710 Bundle result = saveFragmentBasicState(fragment); 711 return result != null ? new Fragment.SavedState(result) : null; 712 } 713 return null; 714 } 715 716 @Override isDestroyed()717 public boolean isDestroyed() { 718 return mDestroyed; 719 } 720 721 @Override toString()722 public String toString() { 723 StringBuilder sb = new StringBuilder(128); 724 sb.append("FragmentManager{"); 725 sb.append(Integer.toHexString(System.identityHashCode(this))); 726 sb.append(" in "); 727 if (mParent != null) { 728 DebugUtils.buildShortClassTag(mParent, sb); 729 } else { 730 DebugUtils.buildShortClassTag(mHost, sb); 731 } 732 sb.append("}}"); 733 return sb.toString(); 734 } 735 736 @Override dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args)737 public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) { 738 String innerPrefix = prefix + " "; 739 740 int N; 741 if (mActive != null) { 742 N = mActive.size(); 743 if (N > 0) { 744 writer.print(prefix); writer.print("Active Fragments in "); 745 writer.print(Integer.toHexString(System.identityHashCode(this))); 746 writer.println(":"); 747 for (int i=0; i<N; i++) { 748 Fragment f = mActive.get(i); 749 writer.print(prefix); writer.print(" #"); writer.print(i); 750 writer.print(": "); writer.println(f); 751 if (f != null) { 752 f.dump(innerPrefix, fd, writer, args); 753 } 754 } 755 } 756 } 757 758 if (mAdded != null) { 759 N = mAdded.size(); 760 if (N > 0) { 761 writer.print(prefix); writer.println("Added Fragments:"); 762 for (int i=0; i<N; i++) { 763 Fragment f = mAdded.get(i); 764 writer.print(prefix); writer.print(" #"); writer.print(i); 765 writer.print(": "); writer.println(f.toString()); 766 } 767 } 768 } 769 770 if (mCreatedMenus != null) { 771 N = mCreatedMenus.size(); 772 if (N > 0) { 773 writer.print(prefix); writer.println("Fragments Created Menus:"); 774 for (int i=0; i<N; i++) { 775 Fragment f = mCreatedMenus.get(i); 776 writer.print(prefix); writer.print(" #"); writer.print(i); 777 writer.print(": "); writer.println(f.toString()); 778 } 779 } 780 } 781 782 if (mBackStack != null) { 783 N = mBackStack.size(); 784 if (N > 0) { 785 writer.print(prefix); writer.println("Back Stack:"); 786 for (int i=0; i<N; i++) { 787 BackStackRecord bs = mBackStack.get(i); 788 writer.print(prefix); writer.print(" #"); writer.print(i); 789 writer.print(": "); writer.println(bs.toString()); 790 bs.dump(innerPrefix, fd, writer, args); 791 } 792 } 793 } 794 795 synchronized (this) { 796 if (mBackStackIndices != null) { 797 N = mBackStackIndices.size(); 798 if (N > 0) { 799 writer.print(prefix); writer.println("Back Stack Indices:"); 800 for (int i=0; i<N; i++) { 801 BackStackRecord bs = mBackStackIndices.get(i); 802 writer.print(prefix); writer.print(" #"); writer.print(i); 803 writer.print(": "); writer.println(bs); 804 } 805 } 806 } 807 808 if (mAvailBackStackIndices != null && mAvailBackStackIndices.size() > 0) { 809 writer.print(prefix); writer.print("mAvailBackStackIndices: "); 810 writer.println(Arrays.toString(mAvailBackStackIndices.toArray())); 811 } 812 } 813 814 if (mPendingActions != null) { 815 N = mPendingActions.size(); 816 if (N > 0) { 817 writer.print(prefix); writer.println("Pending Actions:"); 818 for (int i=0; i<N; i++) { 819 Runnable r = mPendingActions.get(i); 820 writer.print(prefix); writer.print(" #"); writer.print(i); 821 writer.print(": "); writer.println(r); 822 } 823 } 824 } 825 826 writer.print(prefix); writer.println("FragmentManager misc state:"); 827 writer.print(prefix); writer.print(" mHost="); writer.println(mHost); 828 writer.print(prefix); writer.print(" mContainer="); writer.println(mContainer); 829 if (mParent != null) { 830 writer.print(prefix); writer.print(" mParent="); writer.println(mParent); 831 } 832 writer.print(prefix); writer.print(" mCurState="); writer.print(mCurState); 833 writer.print(" mStateSaved="); writer.print(mStateSaved); 834 writer.print(" mDestroyed="); writer.println(mDestroyed); 835 if (mNeedMenuInvalidate) { 836 writer.print(prefix); writer.print(" mNeedMenuInvalidate="); 837 writer.println(mNeedMenuInvalidate); 838 } 839 if (mNoTransactionsBecause != null) { 840 writer.print(prefix); writer.print(" mNoTransactionsBecause="); 841 writer.println(mNoTransactionsBecause); 842 } 843 if (mAvailIndices != null && mAvailIndices.size() > 0) { 844 writer.print(prefix); writer.print(" mAvailIndices: "); 845 writer.println(Arrays.toString(mAvailIndices.toArray())); 846 } 847 } 848 849 static final Interpolator DECELERATE_QUINT = new DecelerateInterpolator(2.5f); 850 static final Interpolator DECELERATE_CUBIC = new DecelerateInterpolator(1.5f); 851 static final Interpolator ACCELERATE_QUINT = new AccelerateInterpolator(2.5f); 852 static final Interpolator ACCELERATE_CUBIC = new AccelerateInterpolator(1.5f); 853 854 static final int ANIM_DUR = 220; 855 makeOpenCloseAnimation(Context context, float startScale, float endScale, float startAlpha, float endAlpha)856 static Animation makeOpenCloseAnimation(Context context, float startScale, 857 float endScale, float startAlpha, float endAlpha) { 858 AnimationSet set = new AnimationSet(false); 859 ScaleAnimation scale = new ScaleAnimation(startScale, endScale, startScale, endScale, 860 Animation.RELATIVE_TO_SELF, .5f, Animation.RELATIVE_TO_SELF, .5f); 861 scale.setInterpolator(DECELERATE_QUINT); 862 scale.setDuration(ANIM_DUR); 863 set.addAnimation(scale); 864 AlphaAnimation alpha = new AlphaAnimation(startAlpha, endAlpha); 865 alpha.setInterpolator(DECELERATE_CUBIC); 866 alpha.setDuration(ANIM_DUR); 867 set.addAnimation(alpha); 868 return set; 869 } 870 makeFadeAnimation(Context context, float start, float end)871 static Animation makeFadeAnimation(Context context, float start, float end) { 872 AlphaAnimation anim = new AlphaAnimation(start, end); 873 anim.setInterpolator(DECELERATE_CUBIC); 874 anim.setDuration(ANIM_DUR); 875 return anim; 876 } 877 loadAnimation(Fragment fragment, int transit, boolean enter, int transitionStyle)878 Animation loadAnimation(Fragment fragment, int transit, boolean enter, 879 int transitionStyle) { 880 Animation animObj = fragment.onCreateAnimation(transit, enter, 881 fragment.mNextAnim); 882 if (animObj != null) { 883 return animObj; 884 } 885 886 if (fragment.mNextAnim != 0) { 887 Animation anim = AnimationUtils.loadAnimation(mHost.getContext(), fragment.mNextAnim); 888 if (anim != null) { 889 return anim; 890 } 891 } 892 893 if (transit == 0) { 894 return null; 895 } 896 897 int styleIndex = transitToStyleIndex(transit, enter); 898 if (styleIndex < 0) { 899 return null; 900 } 901 902 switch (styleIndex) { 903 case ANIM_STYLE_OPEN_ENTER: 904 return makeOpenCloseAnimation(mHost.getContext(), 1.125f, 1.0f, 0, 1); 905 case ANIM_STYLE_OPEN_EXIT: 906 return makeOpenCloseAnimation(mHost.getContext(), 1.0f, .975f, 1, 0); 907 case ANIM_STYLE_CLOSE_ENTER: 908 return makeOpenCloseAnimation(mHost.getContext(), .975f, 1.0f, 0, 1); 909 case ANIM_STYLE_CLOSE_EXIT: 910 return makeOpenCloseAnimation(mHost.getContext(), 1.0f, 1.075f, 1, 0); 911 case ANIM_STYLE_FADE_ENTER: 912 return makeFadeAnimation(mHost.getContext(), 0, 1); 913 case ANIM_STYLE_FADE_EXIT: 914 return makeFadeAnimation(mHost.getContext(), 1, 0); 915 } 916 917 if (transitionStyle == 0 && mHost.onHasWindowAnimations()) { 918 transitionStyle = mHost.onGetWindowAnimations(); 919 } 920 if (transitionStyle == 0) { 921 return null; 922 } 923 924 //TypedArray attrs = mActivity.obtainStyledAttributes(transitionStyle, 925 // com.android.internal.R.styleable.FragmentAnimation); 926 //int anim = attrs.getResourceId(styleIndex, 0); 927 //attrs.recycle(); 928 929 //if (anim == 0) { 930 // return null; 931 //} 932 933 //return AnimatorInflater.loadAnimator(mActivity, anim); 934 return null; 935 } 936 performPendingDeferredStart(Fragment f)937 public void performPendingDeferredStart(Fragment f) { 938 if (f.mDeferStart) { 939 if (mExecutingActions) { 940 // Wait until we're done executing our pending transactions 941 mHavePendingDeferredStart = true; 942 return; 943 } 944 f.mDeferStart = false; 945 moveToState(f, mCurState, 0, 0, false); 946 } 947 } 948 949 /** 950 * Sets the to be animated view on hardware layer during the animation. Note 951 * that calling this will replace any existing animation listener on the animation 952 * with a new one, as animations do not support more than one listeners. Therefore, 953 * animations that already have listeners should do the layer change operations 954 * in their existing listeners, rather than calling this function. 955 */ setHWLayerAnimListenerIfAlpha(final View v, Animation anim)956 private void setHWLayerAnimListenerIfAlpha(final View v, Animation anim) { 957 if (v == null || anim == null) { 958 return; 959 } 960 if (shouldRunOnHWLayer(v, anim)) { 961 AnimationListener originalListener = null; 962 try { 963 if (sAnimationListenerField == null) { 964 sAnimationListenerField = Animation.class.getDeclaredField("mListener"); 965 sAnimationListenerField.setAccessible(true); 966 } 967 originalListener = (AnimationListener) sAnimationListenerField.get(anim); 968 } catch (NoSuchFieldException e) { 969 Log.e(TAG, "No field with the name mListener is found in Animation class", e); 970 } catch (IllegalAccessException e) { 971 Log.e(TAG, "Cannot access Animation's mListener field", e); 972 } 973 // If there's already a listener set on the animation, we need wrap the new listener 974 // around the existing listener, so that they will both get animation listener 975 // callbacks. 976 ViewCompat.setLayerType(v, ViewCompat.LAYER_TYPE_HARDWARE, null); 977 anim.setAnimationListener(new AnimateOnHWLayerIfNeededListener(v, anim, 978 originalListener)); 979 } 980 } 981 isStateAtLeast(int state)982 boolean isStateAtLeast(int state) { 983 return mCurState >= state; 984 } 985 moveToState(Fragment f, int newState, int transit, int transitionStyle, boolean keepActive)986 void moveToState(Fragment f, int newState, int transit, int transitionStyle, 987 boolean keepActive) { 988 // Fragments that are not currently added will sit in the onCreate() state. 989 if ((!f.mAdded || f.mDetached) && newState > Fragment.CREATED) { 990 newState = Fragment.CREATED; 991 } 992 if (f.mRemoving && newState > f.mState) { 993 // While removing a fragment, we can't change it to a higher state. 994 newState = f.mState; 995 } 996 // Defer start if requested; don't allow it to move to STARTED or higher 997 // if it's not already started. 998 if (f.mDeferStart && f.mState < Fragment.STARTED && newState > Fragment.STOPPED) { 999 newState = Fragment.STOPPED; 1000 } 1001 if (f.mState < newState) { 1002 // For fragments that are created from a layout, when restoring from 1003 // state we don't want to allow them to be created until they are 1004 // being reloaded from the layout. 1005 if (f.mFromLayout && !f.mInLayout) { 1006 return; 1007 } 1008 if (f.mAnimatingAway != null) { 1009 // The fragment is currently being animated... but! Now we 1010 // want to move our state back up. Give up on waiting for the 1011 // animation, move to whatever the final state should be once 1012 // the animation is done, and then we can proceed from there. 1013 f.mAnimatingAway = null; 1014 moveToState(f, f.mStateAfterAnimating, 0, 0, true); 1015 } 1016 switch (f.mState) { 1017 case Fragment.INITIALIZING: 1018 if (DEBUG) Log.v(TAG, "moveto CREATED: " + f); 1019 if (f.mSavedFragmentState != null) { 1020 f.mSavedFragmentState.setClassLoader(mHost.getContext().getClassLoader()); 1021 f.mSavedViewState = f.mSavedFragmentState.getSparseParcelableArray( 1022 FragmentManagerImpl.VIEW_STATE_TAG); 1023 f.mTarget = getFragment(f.mSavedFragmentState, 1024 FragmentManagerImpl.TARGET_STATE_TAG); 1025 if (f.mTarget != null) { 1026 f.mTargetRequestCode = f.mSavedFragmentState.getInt( 1027 FragmentManagerImpl.TARGET_REQUEST_CODE_STATE_TAG, 0); 1028 } 1029 f.mUserVisibleHint = f.mSavedFragmentState.getBoolean( 1030 FragmentManagerImpl.USER_VISIBLE_HINT_TAG, true); 1031 if (!f.mUserVisibleHint) { 1032 f.mDeferStart = true; 1033 if (newState > Fragment.STOPPED) { 1034 newState = Fragment.STOPPED; 1035 } 1036 } 1037 } 1038 f.mHost = mHost; 1039 f.mParentFragment = mParent; 1040 f.mFragmentManager = mParent != null 1041 ? mParent.mChildFragmentManager : mHost.getFragmentManagerImpl(); 1042 f.mCalled = false; 1043 f.onAttach(mHost.getContext()); 1044 if (!f.mCalled) { 1045 throw new SuperNotCalledException("Fragment " + f 1046 + " did not call through to super.onAttach()"); 1047 } 1048 if (f.mParentFragment == null) { 1049 mHost.onAttachFragment(f); 1050 } else { 1051 f.mParentFragment.onAttachFragment(f); 1052 } 1053 1054 if (!f.mRetaining) { 1055 f.performCreate(f.mSavedFragmentState); 1056 } else { 1057 f.restoreChildFragmentState(f.mSavedFragmentState); 1058 f.mState = Fragment.CREATED; 1059 } 1060 f.mRetaining = false; 1061 if (f.mFromLayout) { 1062 // For fragments that are part of the content view 1063 // layout, we need to instantiate the view immediately 1064 // and the inflater will take care of adding it. 1065 f.mView = f.performCreateView(f.getLayoutInflater( 1066 f.mSavedFragmentState), null, f.mSavedFragmentState); 1067 if (f.mView != null) { 1068 f.mInnerView = f.mView; 1069 if (Build.VERSION.SDK_INT >= 11) { 1070 ViewCompat.setSaveFromParentEnabled(f.mView, false); 1071 } else { 1072 f.mView = NoSaveStateFrameLayout.wrap(f.mView); 1073 } 1074 if (f.mHidden) f.mView.setVisibility(View.GONE); 1075 f.onViewCreated(f.mView, f.mSavedFragmentState); 1076 } else { 1077 f.mInnerView = null; 1078 } 1079 } 1080 case Fragment.CREATED: 1081 if (newState > Fragment.CREATED) { 1082 if (DEBUG) Log.v(TAG, "moveto ACTIVITY_CREATED: " + f); 1083 if (!f.mFromLayout) { 1084 ViewGroup container = null; 1085 if (f.mContainerId != 0) { 1086 if (f.mContainerId == View.NO_ID) { 1087 throwException(new IllegalArgumentException( 1088 "Cannot create fragment " 1089 + f 1090 + " for a container view with no id")); 1091 } 1092 container = (ViewGroup) mContainer.onFindViewById(f.mContainerId); 1093 if (container == null && !f.mRestored) { 1094 String resName; 1095 try { 1096 resName = f.getResources().getResourceName(f.mContainerId); 1097 } catch (NotFoundException e) { 1098 resName = "unknown"; 1099 } 1100 throwException(new IllegalArgumentException( 1101 "No view found for id 0x" 1102 + Integer.toHexString(f.mContainerId) + " (" 1103 + resName 1104 + ") for fragment " + f)); 1105 } 1106 } 1107 f.mContainer = container; 1108 f.mView = f.performCreateView(f.getLayoutInflater( 1109 f.mSavedFragmentState), container, f.mSavedFragmentState); 1110 if (f.mView != null) { 1111 f.mInnerView = f.mView; 1112 if (Build.VERSION.SDK_INT >= 11) { 1113 ViewCompat.setSaveFromParentEnabled(f.mView, false); 1114 } else { 1115 f.mView = NoSaveStateFrameLayout.wrap(f.mView); 1116 } 1117 if (container != null) { 1118 Animation anim = loadAnimation(f, transit, true, 1119 transitionStyle); 1120 if (anim != null) { 1121 setHWLayerAnimListenerIfAlpha(f.mView, anim); 1122 f.mView.startAnimation(anim); 1123 } 1124 container.addView(f.mView); 1125 } 1126 if (f.mHidden) f.mView.setVisibility(View.GONE); 1127 f.onViewCreated(f.mView, f.mSavedFragmentState); 1128 } else { 1129 f.mInnerView = null; 1130 } 1131 } 1132 1133 f.performActivityCreated(f.mSavedFragmentState); 1134 if (f.mView != null) { 1135 f.restoreViewState(f.mSavedFragmentState); 1136 } 1137 f.mSavedFragmentState = null; 1138 } 1139 case Fragment.ACTIVITY_CREATED: 1140 if (newState > Fragment.ACTIVITY_CREATED) { 1141 f.mState = Fragment.STOPPED; 1142 } 1143 case Fragment.STOPPED: 1144 if (newState > Fragment.STOPPED) { 1145 if (DEBUG) Log.v(TAG, "moveto STARTED: " + f); 1146 f.performStart(); 1147 } 1148 case Fragment.STARTED: 1149 if (newState > Fragment.STARTED) { 1150 if (DEBUG) Log.v(TAG, "moveto RESUMED: " + f); 1151 f.performResume(); 1152 f.mSavedFragmentState = null; 1153 f.mSavedViewState = null; 1154 } 1155 } 1156 } else if (f.mState > newState) { 1157 switch (f.mState) { 1158 case Fragment.RESUMED: 1159 if (newState < Fragment.RESUMED) { 1160 if (DEBUG) Log.v(TAG, "movefrom RESUMED: " + f); 1161 f.performPause(); 1162 } 1163 case Fragment.STARTED: 1164 if (newState < Fragment.STARTED) { 1165 if (DEBUG) Log.v(TAG, "movefrom STARTED: " + f); 1166 f.performStop(); 1167 } 1168 case Fragment.STOPPED: 1169 if (newState < Fragment.STOPPED) { 1170 if (DEBUG) Log.v(TAG, "movefrom STOPPED: " + f); 1171 f.performReallyStop(); 1172 } 1173 case Fragment.ACTIVITY_CREATED: 1174 if (newState < Fragment.ACTIVITY_CREATED) { 1175 if (DEBUG) Log.v(TAG, "movefrom ACTIVITY_CREATED: " + f); 1176 if (f.mView != null) { 1177 // Need to save the current view state if not 1178 // done already. 1179 if (mHost.onShouldSaveFragmentState(f) && f.mSavedViewState == null) { 1180 saveFragmentViewState(f); 1181 } 1182 } 1183 f.performDestroyView(); 1184 if (f.mView != null && f.mContainer != null) { 1185 Animation anim = null; 1186 if (mCurState > Fragment.INITIALIZING && !mDestroyed) { 1187 anim = loadAnimation(f, transit, false, 1188 transitionStyle); 1189 } 1190 if (anim != null) { 1191 final Fragment fragment = f; 1192 f.mAnimatingAway = f.mView; 1193 f.mStateAfterAnimating = newState; 1194 final View viewToAnimate = f.mView; 1195 anim.setAnimationListener(new AnimateOnHWLayerIfNeededListener( 1196 viewToAnimate, anim) { 1197 @Override 1198 public void onAnimationEnd(Animation animation) { 1199 super.onAnimationEnd(animation); 1200 if (fragment.mAnimatingAway != null) { 1201 fragment.mAnimatingAway = null; 1202 moveToState(fragment, fragment.mStateAfterAnimating, 1203 0, 0, false); 1204 } 1205 } 1206 }); 1207 f.mView.startAnimation(anim); 1208 } 1209 f.mContainer.removeView(f.mView); 1210 } 1211 f.mContainer = null; 1212 f.mView = null; 1213 f.mInnerView = null; 1214 } 1215 case Fragment.CREATED: 1216 if (newState < Fragment.CREATED) { 1217 if (mDestroyed) { 1218 if (f.mAnimatingAway != null) { 1219 // The fragment's containing activity is 1220 // being destroyed, but this fragment is 1221 // currently animating away. Stop the 1222 // animation right now -- it is not needed, 1223 // and we can't wait any more on destroying 1224 // the fragment. 1225 View v = f.mAnimatingAway; 1226 f.mAnimatingAway = null; 1227 v.clearAnimation(); 1228 } 1229 } 1230 if (f.mAnimatingAway != null) { 1231 // We are waiting for the fragment's view to finish 1232 // animating away. Just make a note of the state 1233 // the fragment now should move to once the animation 1234 // is done. 1235 f.mStateAfterAnimating = newState; 1236 newState = Fragment.CREATED; 1237 } else { 1238 if (DEBUG) Log.v(TAG, "movefrom CREATED: " + f); 1239 if (!f.mRetaining) { 1240 f.performDestroy(); 1241 } else { 1242 f.mState = Fragment.INITIALIZING; 1243 } 1244 1245 f.performDetach(); 1246 if (!keepActive) { 1247 if (!f.mRetaining) { 1248 makeInactive(f); 1249 } else { 1250 f.mHost = null; 1251 f.mParentFragment = null; 1252 f.mFragmentManager = null; 1253 } 1254 } 1255 } 1256 } 1257 } 1258 } 1259 1260 if (f.mState != newState) { 1261 Log.w(TAG, "moveToState: Fragment state for " + f + " not updated inline; " 1262 + "expected state " + newState + " found " + f.mState); 1263 f.mState = newState; 1264 } 1265 } 1266 moveToState(Fragment f)1267 void moveToState(Fragment f) { 1268 moveToState(f, mCurState, 0, 0, false); 1269 } 1270 moveToState(int newState, boolean always)1271 void moveToState(int newState, boolean always) { 1272 moveToState(newState, 0, 0, always); 1273 } 1274 moveToState(int newState, int transit, int transitStyle, boolean always)1275 void moveToState(int newState, int transit, int transitStyle, boolean always) { 1276 if (mHost == null && newState != Fragment.INITIALIZING) { 1277 throw new IllegalStateException("No host"); 1278 } 1279 1280 if (!always && mCurState == newState) { 1281 return; 1282 } 1283 1284 mCurState = newState; 1285 if (mActive != null) { 1286 boolean loadersRunning = false; 1287 for (int i=0; i<mActive.size(); i++) { 1288 Fragment f = mActive.get(i); 1289 if (f != null) { 1290 moveToState(f, newState, transit, transitStyle, false); 1291 if (f.mLoaderManager != null) { 1292 loadersRunning |= f.mLoaderManager.hasRunningLoaders(); 1293 } 1294 } 1295 } 1296 1297 if (!loadersRunning) { 1298 startPendingDeferredFragments(); 1299 } 1300 1301 if (mNeedMenuInvalidate && mHost != null && mCurState == Fragment.RESUMED) { 1302 mHost.onSupportInvalidateOptionsMenu(); 1303 mNeedMenuInvalidate = false; 1304 } 1305 } 1306 } 1307 startPendingDeferredFragments()1308 void startPendingDeferredFragments() { 1309 if (mActive == null) return; 1310 1311 for (int i=0; i<mActive.size(); i++) { 1312 Fragment f = mActive.get(i); 1313 if (f != null) { 1314 performPendingDeferredStart(f); 1315 } 1316 } 1317 } 1318 makeActive(Fragment f)1319 void makeActive(Fragment f) { 1320 if (f.mIndex >= 0) { 1321 return; 1322 } 1323 1324 if (mAvailIndices == null || mAvailIndices.size() <= 0) { 1325 if (mActive == null) { 1326 mActive = new ArrayList<Fragment>(); 1327 } 1328 f.setIndex(mActive.size(), mParent); 1329 mActive.add(f); 1330 1331 } else { 1332 f.setIndex(mAvailIndices.remove(mAvailIndices.size()-1), mParent); 1333 mActive.set(f.mIndex, f); 1334 } 1335 if (DEBUG) Log.v(TAG, "Allocated fragment index " + f); 1336 } 1337 makeInactive(Fragment f)1338 void makeInactive(Fragment f) { 1339 if (f.mIndex < 0) { 1340 return; 1341 } 1342 1343 if (DEBUG) Log.v(TAG, "Freeing fragment index " + f); 1344 mActive.set(f.mIndex, null); 1345 if (mAvailIndices == null) { 1346 mAvailIndices = new ArrayList<Integer>(); 1347 } 1348 mAvailIndices.add(f.mIndex); 1349 mHost.inactivateFragment(f.mWho); 1350 f.initState(); 1351 } 1352 addFragment(Fragment fragment, boolean moveToStateNow)1353 public void addFragment(Fragment fragment, boolean moveToStateNow) { 1354 if (mAdded == null) { 1355 mAdded = new ArrayList<Fragment>(); 1356 } 1357 if (DEBUG) Log.v(TAG, "add: " + fragment); 1358 makeActive(fragment); 1359 if (!fragment.mDetached) { 1360 if (mAdded.contains(fragment)) { 1361 throw new IllegalStateException("Fragment already added: " + fragment); 1362 } 1363 mAdded.add(fragment); 1364 fragment.mAdded = true; 1365 fragment.mRemoving = false; 1366 if (fragment.mHasMenu && fragment.mMenuVisible) { 1367 mNeedMenuInvalidate = true; 1368 } 1369 if (moveToStateNow) { 1370 moveToState(fragment); 1371 } 1372 } 1373 } 1374 removeFragment(Fragment fragment, int transition, int transitionStyle)1375 public void removeFragment(Fragment fragment, int transition, int transitionStyle) { 1376 if (DEBUG) Log.v(TAG, "remove: " + fragment + " nesting=" + fragment.mBackStackNesting); 1377 final boolean inactive = !fragment.isInBackStack(); 1378 if (!fragment.mDetached || inactive) { 1379 if (mAdded != null) { 1380 mAdded.remove(fragment); 1381 } 1382 if (fragment.mHasMenu && fragment.mMenuVisible) { 1383 mNeedMenuInvalidate = true; 1384 } 1385 fragment.mAdded = false; 1386 fragment.mRemoving = true; 1387 moveToState(fragment, inactive ? Fragment.INITIALIZING : Fragment.CREATED, 1388 transition, transitionStyle, false); 1389 } 1390 } 1391 hideFragment(Fragment fragment, int transition, int transitionStyle)1392 public void hideFragment(Fragment fragment, int transition, int transitionStyle) { 1393 if (DEBUG) Log.v(TAG, "hide: " + fragment); 1394 if (!fragment.mHidden) { 1395 fragment.mHidden = true; 1396 if (fragment.mView != null) { 1397 Animation anim = loadAnimation(fragment, transition, false, 1398 transitionStyle); 1399 if (anim != null) { 1400 setHWLayerAnimListenerIfAlpha(fragment.mView, anim); 1401 fragment.mView.startAnimation(anim); 1402 } 1403 fragment.mView.setVisibility(View.GONE); 1404 } 1405 if (fragment.mAdded && fragment.mHasMenu && fragment.mMenuVisible) { 1406 mNeedMenuInvalidate = true; 1407 } 1408 fragment.onHiddenChanged(true); 1409 } 1410 } 1411 showFragment(Fragment fragment, int transition, int transitionStyle)1412 public void showFragment(Fragment fragment, int transition, int transitionStyle) { 1413 if (DEBUG) Log.v(TAG, "show: " + fragment); 1414 if (fragment.mHidden) { 1415 fragment.mHidden = false; 1416 if (fragment.mView != null) { 1417 Animation anim = loadAnimation(fragment, transition, true, 1418 transitionStyle); 1419 if (anim != null) { 1420 setHWLayerAnimListenerIfAlpha(fragment.mView, anim); 1421 fragment.mView.startAnimation(anim); 1422 } 1423 fragment.mView.setVisibility(View.VISIBLE); 1424 } 1425 if (fragment.mAdded && fragment.mHasMenu && fragment.mMenuVisible) { 1426 mNeedMenuInvalidate = true; 1427 } 1428 fragment.onHiddenChanged(false); 1429 } 1430 } 1431 detachFragment(Fragment fragment, int transition, int transitionStyle)1432 public void detachFragment(Fragment fragment, int transition, int transitionStyle) { 1433 if (DEBUG) Log.v(TAG, "detach: " + fragment); 1434 if (!fragment.mDetached) { 1435 fragment.mDetached = true; 1436 if (fragment.mAdded) { 1437 // We are not already in back stack, so need to remove the fragment. 1438 if (mAdded != null) { 1439 if (DEBUG) Log.v(TAG, "remove from detach: " + fragment); 1440 mAdded.remove(fragment); 1441 } 1442 if (fragment.mHasMenu && fragment.mMenuVisible) { 1443 mNeedMenuInvalidate = true; 1444 } 1445 fragment.mAdded = false; 1446 moveToState(fragment, Fragment.CREATED, transition, transitionStyle, false); 1447 } 1448 } 1449 } 1450 attachFragment(Fragment fragment, int transition, int transitionStyle)1451 public void attachFragment(Fragment fragment, int transition, int transitionStyle) { 1452 if (DEBUG) Log.v(TAG, "attach: " + fragment); 1453 if (fragment.mDetached) { 1454 fragment.mDetached = false; 1455 if (!fragment.mAdded) { 1456 if (mAdded == null) { 1457 mAdded = new ArrayList<Fragment>(); 1458 } 1459 if (mAdded.contains(fragment)) { 1460 throw new IllegalStateException("Fragment already added: " + fragment); 1461 } 1462 if (DEBUG) Log.v(TAG, "add from attach: " + fragment); 1463 mAdded.add(fragment); 1464 fragment.mAdded = true; 1465 if (fragment.mHasMenu && fragment.mMenuVisible) { 1466 mNeedMenuInvalidate = true; 1467 } 1468 moveToState(fragment, mCurState, transition, transitionStyle, false); 1469 } 1470 } 1471 } 1472 1473 @Override findFragmentById(int id)1474 public Fragment findFragmentById(int id) { 1475 if (mAdded != null) { 1476 // First look through added fragments. 1477 for (int i=mAdded.size()-1; i>=0; i--) { 1478 Fragment f = mAdded.get(i); 1479 if (f != null && f.mFragmentId == id) { 1480 return f; 1481 } 1482 } 1483 } 1484 if (mActive != null) { 1485 // Now for any known fragment. 1486 for (int i=mActive.size()-1; i>=0; i--) { 1487 Fragment f = mActive.get(i); 1488 if (f != null && f.mFragmentId == id) { 1489 return f; 1490 } 1491 } 1492 } 1493 return null; 1494 } 1495 1496 @Override findFragmentByTag(String tag)1497 public Fragment findFragmentByTag(String tag) { 1498 if (mAdded != null && tag != null) { 1499 // First look through added fragments. 1500 for (int i=mAdded.size()-1; i>=0; i--) { 1501 Fragment f = mAdded.get(i); 1502 if (f != null && tag.equals(f.mTag)) { 1503 return f; 1504 } 1505 } 1506 } 1507 if (mActive != null && tag != null) { 1508 // Now for any known fragment. 1509 for (int i=mActive.size()-1; i>=0; i--) { 1510 Fragment f = mActive.get(i); 1511 if (f != null && tag.equals(f.mTag)) { 1512 return f; 1513 } 1514 } 1515 } 1516 return null; 1517 } 1518 findFragmentByWho(String who)1519 public Fragment findFragmentByWho(String who) { 1520 if (mActive != null && who != null) { 1521 for (int i=mActive.size()-1; i>=0; i--) { 1522 Fragment f = mActive.get(i); 1523 if (f != null && (f=f.findFragmentByWho(who)) != null) { 1524 return f; 1525 } 1526 } 1527 } 1528 return null; 1529 } 1530 checkStateLoss()1531 private void checkStateLoss() { 1532 if (mStateSaved) { 1533 throw new IllegalStateException( 1534 "Can not perform this action after onSaveInstanceState"); 1535 } 1536 if (mNoTransactionsBecause != null) { 1537 throw new IllegalStateException( 1538 "Can not perform this action inside of " + mNoTransactionsBecause); 1539 } 1540 } 1541 1542 /** 1543 * Adds an action to the queue of pending actions. 1544 * 1545 * @param action the action to add 1546 * @param allowStateLoss whether to allow loss of state information 1547 * @throws IllegalStateException if the activity has been destroyed 1548 */ enqueueAction(Runnable action, boolean allowStateLoss)1549 public void enqueueAction(Runnable action, boolean allowStateLoss) { 1550 if (!allowStateLoss) { 1551 checkStateLoss(); 1552 } 1553 synchronized (this) { 1554 if (mDestroyed || mHost == null) { 1555 throw new IllegalStateException("Activity has been destroyed"); 1556 } 1557 if (mPendingActions == null) { 1558 mPendingActions = new ArrayList<Runnable>(); 1559 } 1560 mPendingActions.add(action); 1561 if (mPendingActions.size() == 1) { 1562 mHost.getHandler().removeCallbacks(mExecCommit); 1563 mHost.getHandler().post(mExecCommit); 1564 } 1565 } 1566 } 1567 allocBackStackIndex(BackStackRecord bse)1568 public int allocBackStackIndex(BackStackRecord bse) { 1569 synchronized (this) { 1570 if (mAvailBackStackIndices == null || mAvailBackStackIndices.size() <= 0) { 1571 if (mBackStackIndices == null) { 1572 mBackStackIndices = new ArrayList<BackStackRecord>(); 1573 } 1574 int index = mBackStackIndices.size(); 1575 if (DEBUG) Log.v(TAG, "Setting back stack index " + index + " to " + bse); 1576 mBackStackIndices.add(bse); 1577 return index; 1578 1579 } else { 1580 int index = mAvailBackStackIndices.remove(mAvailBackStackIndices.size()-1); 1581 if (DEBUG) Log.v(TAG, "Adding back stack index " + index + " with " + bse); 1582 mBackStackIndices.set(index, bse); 1583 return index; 1584 } 1585 } 1586 } 1587 setBackStackIndex(int index, BackStackRecord bse)1588 public void setBackStackIndex(int index, BackStackRecord bse) { 1589 synchronized (this) { 1590 if (mBackStackIndices == null) { 1591 mBackStackIndices = new ArrayList<BackStackRecord>(); 1592 } 1593 int N = mBackStackIndices.size(); 1594 if (index < N) { 1595 if (DEBUG) Log.v(TAG, "Setting back stack index " + index + " to " + bse); 1596 mBackStackIndices.set(index, bse); 1597 } else { 1598 while (N < index) { 1599 mBackStackIndices.add(null); 1600 if (mAvailBackStackIndices == null) { 1601 mAvailBackStackIndices = new ArrayList<Integer>(); 1602 } 1603 if (DEBUG) Log.v(TAG, "Adding available back stack index " + N); 1604 mAvailBackStackIndices.add(N); 1605 N++; 1606 } 1607 if (DEBUG) Log.v(TAG, "Adding back stack index " + index + " with " + bse); 1608 mBackStackIndices.add(bse); 1609 } 1610 } 1611 } 1612 freeBackStackIndex(int index)1613 public void freeBackStackIndex(int index) { 1614 synchronized (this) { 1615 mBackStackIndices.set(index, null); 1616 if (mAvailBackStackIndices == null) { 1617 mAvailBackStackIndices = new ArrayList<Integer>(); 1618 } 1619 if (DEBUG) Log.v(TAG, "Freeing back stack index " + index); 1620 mAvailBackStackIndices.add(index); 1621 } 1622 } 1623 execSingleAction(Runnable action, boolean allowStateLoss)1624 public void execSingleAction(Runnable action, boolean allowStateLoss) { 1625 if (mExecutingActions) { 1626 throw new IllegalStateException("FragmentManager is already executing transactions"); 1627 } 1628 1629 if (Looper.myLooper() != mHost.getHandler().getLooper()) { 1630 throw new IllegalStateException("Must be called from main thread of fragment host"); 1631 } 1632 1633 if (!allowStateLoss) { 1634 checkStateLoss(); 1635 } 1636 1637 mExecutingActions = true; 1638 action.run(); 1639 mExecutingActions = false; 1640 1641 doPendingDeferredStart(); 1642 } 1643 1644 /** 1645 * Only call from main thread! 1646 */ execPendingActions()1647 public boolean execPendingActions() { 1648 if (mExecutingActions) { 1649 throw new IllegalStateException("FragmentManager is already executing transactions"); 1650 } 1651 1652 if (Looper.myLooper() != mHost.getHandler().getLooper()) { 1653 throw new IllegalStateException("Must be called from main thread of fragment host"); 1654 } 1655 1656 boolean didSomething = false; 1657 1658 while (true) { 1659 int numActions; 1660 1661 synchronized (this) { 1662 if (mPendingActions == null || mPendingActions.size() == 0) { 1663 break; 1664 } 1665 1666 numActions = mPendingActions.size(); 1667 if (mTmpActions == null || mTmpActions.length < numActions) { 1668 mTmpActions = new Runnable[numActions]; 1669 } 1670 mPendingActions.toArray(mTmpActions); 1671 mPendingActions.clear(); 1672 mHost.getHandler().removeCallbacks(mExecCommit); 1673 } 1674 1675 mExecutingActions = true; 1676 for (int i=0; i<numActions; i++) { 1677 mTmpActions[i].run(); 1678 mTmpActions[i] = null; 1679 } 1680 mExecutingActions = false; 1681 didSomething = true; 1682 } 1683 1684 doPendingDeferredStart(); 1685 1686 return didSomething; 1687 } 1688 doPendingDeferredStart()1689 void doPendingDeferredStart() { 1690 if (mHavePendingDeferredStart) { 1691 boolean loadersRunning = false; 1692 for (int i = 0; i < mActive.size(); i++) { 1693 Fragment f = mActive.get(i); 1694 if (f != null && f.mLoaderManager != null) { 1695 loadersRunning |= f.mLoaderManager.hasRunningLoaders(); 1696 } 1697 } 1698 if (!loadersRunning) { 1699 mHavePendingDeferredStart = false; 1700 startPendingDeferredFragments(); 1701 } 1702 } 1703 } 1704 reportBackStackChanged()1705 void reportBackStackChanged() { 1706 if (mBackStackChangeListeners != null) { 1707 for (int i=0; i<mBackStackChangeListeners.size(); i++) { 1708 mBackStackChangeListeners.get(i).onBackStackChanged(); 1709 } 1710 } 1711 } 1712 addBackStackState(BackStackRecord state)1713 void addBackStackState(BackStackRecord state) { 1714 if (mBackStack == null) { 1715 mBackStack = new ArrayList<BackStackRecord>(); 1716 } 1717 mBackStack.add(state); 1718 reportBackStackChanged(); 1719 } 1720 1721 @SuppressWarnings("unused") popBackStackState(Handler handler, String name, int id, int flags)1722 boolean popBackStackState(Handler handler, String name, int id, int flags) { 1723 if (mBackStack == null) { 1724 return false; 1725 } 1726 if (name == null && id < 0 && (flags&POP_BACK_STACK_INCLUSIVE) == 0) { 1727 int last = mBackStack.size()-1; 1728 if (last < 0) { 1729 return false; 1730 } 1731 final BackStackRecord bss = mBackStack.remove(last); 1732 SparseArray<Fragment> firstOutFragments = new SparseArray<Fragment>(); 1733 SparseArray<Fragment> lastInFragments = new SparseArray<Fragment>(); 1734 if (mCurState >= Fragment.CREATED) { 1735 bss.calculateBackFragments(firstOutFragments, lastInFragments); 1736 } 1737 bss.popFromBackStack(true, null, firstOutFragments, lastInFragments); 1738 reportBackStackChanged(); 1739 } else { 1740 int index = -1; 1741 if (name != null || id >= 0) { 1742 // If a name or ID is specified, look for that place in 1743 // the stack. 1744 index = mBackStack.size()-1; 1745 while (index >= 0) { 1746 BackStackRecord bss = mBackStack.get(index); 1747 if (name != null && name.equals(bss.getName())) { 1748 break; 1749 } 1750 if (id >= 0 && id == bss.mIndex) { 1751 break; 1752 } 1753 index--; 1754 } 1755 if (index < 0) { 1756 return false; 1757 } 1758 if ((flags&POP_BACK_STACK_INCLUSIVE) != 0) { 1759 index--; 1760 // Consume all following entries that match. 1761 while (index >= 0) { 1762 BackStackRecord bss = mBackStack.get(index); 1763 if ((name != null && name.equals(bss.getName())) 1764 || (id >= 0 && id == bss.mIndex)) { 1765 index--; 1766 continue; 1767 } 1768 break; 1769 } 1770 } 1771 } 1772 if (index == mBackStack.size()-1) { 1773 return false; 1774 } 1775 final ArrayList<BackStackRecord> states 1776 = new ArrayList<BackStackRecord>(); 1777 for (int i=mBackStack.size()-1; i>index; i--) { 1778 states.add(mBackStack.remove(i)); 1779 } 1780 final int LAST = states.size()-1; 1781 SparseArray<Fragment> firstOutFragments = new SparseArray<Fragment>(); 1782 SparseArray<Fragment> lastInFragments = new SparseArray<Fragment>(); 1783 if (mCurState >= Fragment.CREATED) { 1784 for (int i = 0; i <= LAST; i++) { 1785 states.get(i).calculateBackFragments(firstOutFragments, lastInFragments); 1786 } 1787 } 1788 BackStackRecord.TransitionState state = null; 1789 for (int i=0; i<=LAST; i++) { 1790 if (DEBUG) Log.v(TAG, "Popping back stack state: " + states.get(i)); 1791 state = states.get(i).popFromBackStack(i == LAST, state, 1792 firstOutFragments, lastInFragments); 1793 } 1794 reportBackStackChanged(); 1795 } 1796 return true; 1797 } 1798 retainNonConfig()1799 FragmentManagerNonConfig retainNonConfig() { 1800 ArrayList<Fragment> fragments = null; 1801 ArrayList<FragmentManagerNonConfig> childFragments = null; 1802 if (mActive != null) { 1803 for (int i=0; i<mActive.size(); i++) { 1804 Fragment f = mActive.get(i); 1805 if (f != null) { 1806 if (f.mRetainInstance) { 1807 if (fragments == null) { 1808 fragments = new ArrayList<Fragment>(); 1809 } 1810 fragments.add(f); 1811 f.mRetaining = true; 1812 f.mTargetIndex = f.mTarget != null ? f.mTarget.mIndex : -1; 1813 if (DEBUG) Log.v(TAG, "retainNonConfig: keeping retained " + f); 1814 } 1815 boolean addedChild = false; 1816 if (f.mChildFragmentManager != null) { 1817 FragmentManagerNonConfig child = f.mChildFragmentManager.retainNonConfig(); 1818 if (child != null) { 1819 if (childFragments == null) { 1820 childFragments = new ArrayList<FragmentManagerNonConfig>(); 1821 for (int j = 0; j < i; j++) { 1822 childFragments.add(null); 1823 } 1824 } 1825 childFragments.add(child); 1826 addedChild = true; 1827 } 1828 } 1829 if (childFragments != null && !addedChild) { 1830 childFragments.add(null); 1831 } 1832 } 1833 } 1834 } 1835 if (fragments == null && childFragments == null) { 1836 return null; 1837 } 1838 return new FragmentManagerNonConfig(fragments, childFragments); 1839 } 1840 saveFragmentViewState(Fragment f)1841 void saveFragmentViewState(Fragment f) { 1842 if (f.mInnerView == null) { 1843 return; 1844 } 1845 if (mStateArray == null) { 1846 mStateArray = new SparseArray<Parcelable>(); 1847 } else { 1848 mStateArray.clear(); 1849 } 1850 f.mInnerView.saveHierarchyState(mStateArray); 1851 if (mStateArray.size() > 0) { 1852 f.mSavedViewState = mStateArray; 1853 mStateArray = null; 1854 } 1855 } 1856 saveFragmentBasicState(Fragment f)1857 Bundle saveFragmentBasicState(Fragment f) { 1858 Bundle result = null; 1859 1860 if (mStateBundle == null) { 1861 mStateBundle = new Bundle(); 1862 } 1863 f.performSaveInstanceState(mStateBundle); 1864 if (!mStateBundle.isEmpty()) { 1865 result = mStateBundle; 1866 mStateBundle = null; 1867 } 1868 1869 if (f.mView != null) { 1870 saveFragmentViewState(f); 1871 } 1872 if (f.mSavedViewState != null) { 1873 if (result == null) { 1874 result = new Bundle(); 1875 } 1876 result.putSparseParcelableArray( 1877 FragmentManagerImpl.VIEW_STATE_TAG, f.mSavedViewState); 1878 } 1879 if (!f.mUserVisibleHint) { 1880 if (result == null) { 1881 result = new Bundle(); 1882 } 1883 // Only add this if it's not the default value 1884 result.putBoolean(FragmentManagerImpl.USER_VISIBLE_HINT_TAG, f.mUserVisibleHint); 1885 } 1886 1887 return result; 1888 } 1889 saveAllState()1890 Parcelable saveAllState() { 1891 // Make sure all pending operations have now been executed to get 1892 // our state update-to-date. 1893 execPendingActions(); 1894 1895 if (HONEYCOMB) { 1896 // As of Honeycomb, we save state after pausing. Prior to that 1897 // it is before pausing. With fragments this is an issue, since 1898 // there are many things you may do after pausing but before 1899 // stopping that change the fragment state. For those older 1900 // devices, we will not at this point say that we have saved 1901 // the state, so we will allow them to continue doing fragment 1902 // transactions. This retains the same semantics as Honeycomb, 1903 // though you do have the risk of losing the very most recent state 1904 // if the process is killed... we'll live with that. 1905 mStateSaved = true; 1906 } 1907 1908 if (mActive == null || mActive.size() <= 0) { 1909 return null; 1910 } 1911 1912 // First collect all active fragments. 1913 int N = mActive.size(); 1914 FragmentState[] active = new FragmentState[N]; 1915 boolean haveFragments = false; 1916 for (int i=0; i<N; i++) { 1917 Fragment f = mActive.get(i); 1918 if (f != null) { 1919 if (f.mIndex < 0) { 1920 throwException(new IllegalStateException( 1921 "Failure saving state: active " + f 1922 + " has cleared index: " + f.mIndex)); 1923 } 1924 1925 haveFragments = true; 1926 1927 FragmentState fs = new FragmentState(f); 1928 active[i] = fs; 1929 1930 if (f.mState > Fragment.INITIALIZING && fs.mSavedFragmentState == null) { 1931 fs.mSavedFragmentState = saveFragmentBasicState(f); 1932 1933 if (f.mTarget != null) { 1934 if (f.mTarget.mIndex < 0) { 1935 throwException(new IllegalStateException( 1936 "Failure saving state: " + f 1937 + " has target not in fragment manager: " + f.mTarget)); 1938 } 1939 if (fs.mSavedFragmentState == null) { 1940 fs.mSavedFragmentState = new Bundle(); 1941 } 1942 putFragment(fs.mSavedFragmentState, 1943 FragmentManagerImpl.TARGET_STATE_TAG, f.mTarget); 1944 if (f.mTargetRequestCode != 0) { 1945 fs.mSavedFragmentState.putInt( 1946 FragmentManagerImpl.TARGET_REQUEST_CODE_STATE_TAG, 1947 f.mTargetRequestCode); 1948 } 1949 } 1950 1951 } else { 1952 fs.mSavedFragmentState = f.mSavedFragmentState; 1953 } 1954 1955 if (DEBUG) Log.v(TAG, "Saved state of " + f + ": " 1956 + fs.mSavedFragmentState); 1957 } 1958 } 1959 1960 if (!haveFragments) { 1961 if (DEBUG) Log.v(TAG, "saveAllState: no fragments!"); 1962 return null; 1963 } 1964 1965 int[] added = null; 1966 BackStackState[] backStack = null; 1967 1968 // Build list of currently added fragments. 1969 if (mAdded != null) { 1970 N = mAdded.size(); 1971 if (N > 0) { 1972 added = new int[N]; 1973 for (int i=0; i<N; i++) { 1974 added[i] = mAdded.get(i).mIndex; 1975 if (added[i] < 0) { 1976 throwException(new IllegalStateException( 1977 "Failure saving state: active " + mAdded.get(i) 1978 + " has cleared index: " + added[i])); 1979 } 1980 if (DEBUG) Log.v(TAG, "saveAllState: adding fragment #" + i 1981 + ": " + mAdded.get(i)); 1982 } 1983 } 1984 } 1985 1986 // Now save back stack. 1987 if (mBackStack != null) { 1988 N = mBackStack.size(); 1989 if (N > 0) { 1990 backStack = new BackStackState[N]; 1991 for (int i=0; i<N; i++) { 1992 backStack[i] = new BackStackState(mBackStack.get(i)); 1993 if (DEBUG) Log.v(TAG, "saveAllState: adding back stack #" + i 1994 + ": " + mBackStack.get(i)); 1995 } 1996 } 1997 } 1998 1999 FragmentManagerState fms = new FragmentManagerState(); 2000 fms.mActive = active; 2001 fms.mAdded = added; 2002 fms.mBackStack = backStack; 2003 return fms; 2004 } 2005 restoreAllState(Parcelable state, FragmentManagerNonConfig nonConfig)2006 void restoreAllState(Parcelable state, FragmentManagerNonConfig nonConfig) { 2007 // If there is no saved state at all, then there can not be 2008 // any nonConfig fragments either, so that is that. 2009 if (state == null) return; 2010 FragmentManagerState fms = (FragmentManagerState)state; 2011 if (fms.mActive == null) return; 2012 2013 List<FragmentManagerNonConfig> childNonConfigs = null; 2014 2015 // First re-attach any non-config instances we are retaining back 2016 // to their saved state, so we don't try to instantiate them again. 2017 if (nonConfig != null) { 2018 List<Fragment> nonConfigFragments = nonConfig.getFragments(); 2019 childNonConfigs = nonConfig.getChildNonConfigs(); 2020 final int count = nonConfigFragments != null ? nonConfigFragments.size() : 0; 2021 for (int i = 0; i < count; i++) { 2022 Fragment f = nonConfigFragments.get(i); 2023 if (DEBUG) Log.v(TAG, "restoreAllState: re-attaching retained " + f); 2024 FragmentState fs = fms.mActive[f.mIndex]; 2025 fs.mInstance = f; 2026 f.mSavedViewState = null; 2027 f.mBackStackNesting = 0; 2028 f.mInLayout = false; 2029 f.mAdded = false; 2030 f.mTarget = null; 2031 if (fs.mSavedFragmentState != null) { 2032 fs.mSavedFragmentState.setClassLoader(mHost.getContext().getClassLoader()); 2033 f.mSavedViewState = fs.mSavedFragmentState.getSparseParcelableArray( 2034 FragmentManagerImpl.VIEW_STATE_TAG); 2035 f.mSavedFragmentState = fs.mSavedFragmentState; 2036 } 2037 } 2038 } 2039 2040 // Build the full list of active fragments, instantiating them from 2041 // their saved state. 2042 mActive = new ArrayList<>(fms.mActive.length); 2043 if (mAvailIndices != null) { 2044 mAvailIndices.clear(); 2045 } 2046 for (int i=0; i<fms.mActive.length; i++) { 2047 FragmentState fs = fms.mActive[i]; 2048 if (fs != null) { 2049 FragmentManagerNonConfig childNonConfig = null; 2050 if (childNonConfigs != null && i < childNonConfigs.size()) { 2051 childNonConfig = childNonConfigs.get(i); 2052 } 2053 Fragment f = fs.instantiate(mHost, mParent, childNonConfig); 2054 if (DEBUG) Log.v(TAG, "restoreAllState: active #" + i + ": " + f); 2055 mActive.add(f); 2056 // Now that the fragment is instantiated (or came from being 2057 // retained above), clear mInstance in case we end up re-restoring 2058 // from this FragmentState again. 2059 fs.mInstance = null; 2060 } else { 2061 mActive.add(null); 2062 if (mAvailIndices == null) { 2063 mAvailIndices = new ArrayList<Integer>(); 2064 } 2065 if (DEBUG) Log.v(TAG, "restoreAllState: avail #" + i); 2066 mAvailIndices.add(i); 2067 } 2068 } 2069 2070 // Update the target of all retained fragments. 2071 if (nonConfig != null) { 2072 List<Fragment> nonConfigFragments = nonConfig.getFragments(); 2073 final int count = nonConfigFragments != null ? nonConfigFragments.size() : 0; 2074 for (int i = 0; i < count; i++) { 2075 Fragment f = nonConfigFragments.get(i); 2076 if (f.mTargetIndex >= 0) { 2077 if (f.mTargetIndex < mActive.size()) { 2078 f.mTarget = mActive.get(f.mTargetIndex); 2079 } else { 2080 Log.w(TAG, "Re-attaching retained fragment " + f 2081 + " target no longer exists: " + f.mTargetIndex); 2082 f.mTarget = null; 2083 } 2084 } 2085 } 2086 } 2087 2088 // Build the list of currently added fragments. 2089 if (fms.mAdded != null) { 2090 mAdded = new ArrayList<Fragment>(fms.mAdded.length); 2091 for (int i=0; i<fms.mAdded.length; i++) { 2092 Fragment f = mActive.get(fms.mAdded[i]); 2093 if (f == null) { 2094 throwException(new IllegalStateException( 2095 "No instantiated fragment for index #" + fms.mAdded[i])); 2096 } 2097 f.mAdded = true; 2098 if (DEBUG) Log.v(TAG, "restoreAllState: added #" + i + ": " + f); 2099 if (mAdded.contains(f)) { 2100 throw new IllegalStateException("Already added!"); 2101 } 2102 mAdded.add(f); 2103 } 2104 } else { 2105 mAdded = null; 2106 } 2107 2108 // Build the back stack. 2109 if (fms.mBackStack != null) { 2110 mBackStack = new ArrayList<BackStackRecord>(fms.mBackStack.length); 2111 for (int i=0; i<fms.mBackStack.length; i++) { 2112 BackStackRecord bse = fms.mBackStack[i].instantiate(this); 2113 if (DEBUG) { 2114 Log.v(TAG, "restoreAllState: back stack #" + i 2115 + " (index " + bse.mIndex + "): " + bse); 2116 LogWriter logw = new LogWriter(TAG); 2117 PrintWriter pw = new PrintWriter(logw); 2118 bse.dump(" ", pw, false); 2119 } 2120 mBackStack.add(bse); 2121 if (bse.mIndex >= 0) { 2122 setBackStackIndex(bse.mIndex, bse); 2123 } 2124 } 2125 } else { 2126 mBackStack = null; 2127 } 2128 } 2129 attachController(FragmentHostCallback host, FragmentContainer container, Fragment parent)2130 public void attachController(FragmentHostCallback host, 2131 FragmentContainer container, Fragment parent) { 2132 if (mHost != null) throw new IllegalStateException("Already attached"); 2133 mHost = host; 2134 mContainer = container; 2135 mParent = parent; 2136 } 2137 noteStateNotSaved()2138 public void noteStateNotSaved() { 2139 mStateSaved = false; 2140 } 2141 dispatchCreate()2142 public void dispatchCreate() { 2143 mStateSaved = false; 2144 moveToState(Fragment.CREATED, false); 2145 } 2146 dispatchActivityCreated()2147 public void dispatchActivityCreated() { 2148 mStateSaved = false; 2149 moveToState(Fragment.ACTIVITY_CREATED, false); 2150 } 2151 dispatchStart()2152 public void dispatchStart() { 2153 mStateSaved = false; 2154 moveToState(Fragment.STARTED, false); 2155 } 2156 dispatchResume()2157 public void dispatchResume() { 2158 mStateSaved = false; 2159 moveToState(Fragment.RESUMED, false); 2160 } 2161 dispatchPause()2162 public void dispatchPause() { 2163 moveToState(Fragment.STARTED, false); 2164 } 2165 dispatchStop()2166 public void dispatchStop() { 2167 // See saveAllState() for the explanation of this. We do this for 2168 // all platform versions, to keep our behavior more consistent between 2169 // them. 2170 mStateSaved = true; 2171 2172 moveToState(Fragment.STOPPED, false); 2173 } 2174 dispatchReallyStop()2175 public void dispatchReallyStop() { 2176 moveToState(Fragment.ACTIVITY_CREATED, false); 2177 } 2178 dispatchDestroyView()2179 public void dispatchDestroyView() { 2180 moveToState(Fragment.CREATED, false); 2181 } 2182 dispatchDestroy()2183 public void dispatchDestroy() { 2184 mDestroyed = true; 2185 execPendingActions(); 2186 moveToState(Fragment.INITIALIZING, false); 2187 mHost = null; 2188 mContainer = null; 2189 mParent = null; 2190 } 2191 dispatchMultiWindowModeChanged(boolean isInMultiWindowMode)2192 public void dispatchMultiWindowModeChanged(boolean isInMultiWindowMode) { 2193 if (mAdded == null) { 2194 return; 2195 } 2196 for (int i = mAdded.size() - 1; i >= 0; --i) { 2197 final android.support.v4.app.Fragment f = mAdded.get(i); 2198 if (f != null) { 2199 f.performMultiWindowModeChanged(isInMultiWindowMode); 2200 } 2201 } 2202 } 2203 dispatchPictureInPictureModeChanged(boolean isInPictureInPictureMode)2204 public void dispatchPictureInPictureModeChanged(boolean isInPictureInPictureMode) { 2205 if (mAdded == null) { 2206 return; 2207 } 2208 for (int i = mAdded.size() - 1; i >= 0; --i) { 2209 final android.support.v4.app.Fragment f = mAdded.get(i); 2210 if (f != null) { 2211 f.performPictureInPictureModeChanged(isInPictureInPictureMode); 2212 } 2213 } 2214 } 2215 dispatchConfigurationChanged(Configuration newConfig)2216 public void dispatchConfigurationChanged(Configuration newConfig) { 2217 if (mAdded != null) { 2218 for (int i=0; i<mAdded.size(); i++) { 2219 Fragment f = mAdded.get(i); 2220 if (f != null) { 2221 f.performConfigurationChanged(newConfig); 2222 } 2223 } 2224 } 2225 } 2226 dispatchLowMemory()2227 public void dispatchLowMemory() { 2228 if (mAdded != null) { 2229 for (int i=0; i<mAdded.size(); i++) { 2230 Fragment f = mAdded.get(i); 2231 if (f != null) { 2232 f.performLowMemory(); 2233 } 2234 } 2235 } 2236 } 2237 dispatchCreateOptionsMenu(Menu menu, MenuInflater inflater)2238 public boolean dispatchCreateOptionsMenu(Menu menu, MenuInflater inflater) { 2239 boolean show = false; 2240 ArrayList<Fragment> newMenus = null; 2241 if (mAdded != null) { 2242 for (int i=0; i<mAdded.size(); i++) { 2243 Fragment f = mAdded.get(i); 2244 if (f != null) { 2245 if (f.performCreateOptionsMenu(menu, inflater)) { 2246 show = true; 2247 if (newMenus == null) { 2248 newMenus = new ArrayList<Fragment>(); 2249 } 2250 newMenus.add(f); 2251 } 2252 } 2253 } 2254 } 2255 2256 if (mCreatedMenus != null) { 2257 for (int i=0; i<mCreatedMenus.size(); i++) { 2258 Fragment f = mCreatedMenus.get(i); 2259 if (newMenus == null || !newMenus.contains(f)) { 2260 f.onDestroyOptionsMenu(); 2261 } 2262 } 2263 } 2264 2265 mCreatedMenus = newMenus; 2266 2267 return show; 2268 } 2269 dispatchPrepareOptionsMenu(Menu menu)2270 public boolean dispatchPrepareOptionsMenu(Menu menu) { 2271 boolean show = false; 2272 if (mAdded != null) { 2273 for (int i=0; i<mAdded.size(); i++) { 2274 Fragment f = mAdded.get(i); 2275 if (f != null) { 2276 if (f.performPrepareOptionsMenu(menu)) { 2277 show = true; 2278 } 2279 } 2280 } 2281 } 2282 return show; 2283 } 2284 dispatchOptionsItemSelected(MenuItem item)2285 public boolean dispatchOptionsItemSelected(MenuItem item) { 2286 if (mAdded != null) { 2287 for (int i=0; i<mAdded.size(); i++) { 2288 Fragment f = mAdded.get(i); 2289 if (f != null) { 2290 if (f.performOptionsItemSelected(item)) { 2291 return true; 2292 } 2293 } 2294 } 2295 } 2296 return false; 2297 } 2298 dispatchContextItemSelected(MenuItem item)2299 public boolean dispatchContextItemSelected(MenuItem item) { 2300 if (mAdded != null) { 2301 for (int i=0; i<mAdded.size(); i++) { 2302 Fragment f = mAdded.get(i); 2303 if (f != null) { 2304 if (f.performContextItemSelected(item)) { 2305 return true; 2306 } 2307 } 2308 } 2309 } 2310 return false; 2311 } 2312 dispatchOptionsMenuClosed(Menu menu)2313 public void dispatchOptionsMenuClosed(Menu menu) { 2314 if (mAdded != null) { 2315 for (int i=0; i<mAdded.size(); i++) { 2316 Fragment f = mAdded.get(i); 2317 if (f != null) { 2318 f.performOptionsMenuClosed(menu); 2319 } 2320 } 2321 } 2322 } 2323 reverseTransit(int transit)2324 public static int reverseTransit(int transit) { 2325 int rev = 0; 2326 switch (transit) { 2327 case FragmentTransaction.TRANSIT_FRAGMENT_OPEN: 2328 rev = FragmentTransaction.TRANSIT_FRAGMENT_CLOSE; 2329 break; 2330 case FragmentTransaction.TRANSIT_FRAGMENT_CLOSE: 2331 rev = FragmentTransaction.TRANSIT_FRAGMENT_OPEN; 2332 break; 2333 case FragmentTransaction.TRANSIT_FRAGMENT_FADE: 2334 rev = FragmentTransaction.TRANSIT_FRAGMENT_FADE; 2335 break; 2336 } 2337 return rev; 2338 2339 } 2340 2341 public static final int ANIM_STYLE_OPEN_ENTER = 1; 2342 public static final int ANIM_STYLE_OPEN_EXIT = 2; 2343 public static final int ANIM_STYLE_CLOSE_ENTER = 3; 2344 public static final int ANIM_STYLE_CLOSE_EXIT = 4; 2345 public static final int ANIM_STYLE_FADE_ENTER = 5; 2346 public static final int ANIM_STYLE_FADE_EXIT = 6; 2347 transitToStyleIndex(int transit, boolean enter)2348 public static int transitToStyleIndex(int transit, boolean enter) { 2349 int animAttr = -1; 2350 switch (transit) { 2351 case FragmentTransaction.TRANSIT_FRAGMENT_OPEN: 2352 animAttr = enter ? ANIM_STYLE_OPEN_ENTER : ANIM_STYLE_OPEN_EXIT; 2353 break; 2354 case FragmentTransaction.TRANSIT_FRAGMENT_CLOSE: 2355 animAttr = enter ? ANIM_STYLE_CLOSE_ENTER : ANIM_STYLE_CLOSE_EXIT; 2356 break; 2357 case FragmentTransaction.TRANSIT_FRAGMENT_FADE: 2358 animAttr = enter ? ANIM_STYLE_FADE_ENTER : ANIM_STYLE_FADE_EXIT; 2359 break; 2360 } 2361 return animAttr; 2362 } 2363 2364 @Override onCreateView(View parent, String name, Context context, AttributeSet attrs)2365 public View onCreateView(View parent, String name, Context context, AttributeSet attrs) { 2366 if (!"fragment".equals(name)) { 2367 return null; 2368 } 2369 2370 String fname = attrs.getAttributeValue(null, "class"); 2371 TypedArray a = context.obtainStyledAttributes(attrs, FragmentTag.Fragment); 2372 if (fname == null) { 2373 fname = a.getString(FragmentTag.Fragment_name); 2374 } 2375 int id = a.getResourceId(FragmentTag.Fragment_id, View.NO_ID); 2376 String tag = a.getString(FragmentTag.Fragment_tag); 2377 a.recycle(); 2378 2379 if (!Fragment.isSupportFragmentClass(mHost.getContext(), fname)) { 2380 // Invalid support lib fragment; let the device's framework handle it. 2381 // This will allow android.app.Fragments to do the right thing. 2382 return null; 2383 } 2384 2385 int containerId = parent != null ? parent.getId() : 0; 2386 if (containerId == View.NO_ID && id == View.NO_ID && tag == null) { 2387 throw new IllegalArgumentException(attrs.getPositionDescription() 2388 + ": Must specify unique android:id, android:tag, or have a parent with an id for " + fname); 2389 } 2390 2391 // If we restored from a previous state, we may already have 2392 // instantiated this fragment from the state and should use 2393 // that instance instead of making a new one. 2394 Fragment fragment = id != View.NO_ID ? findFragmentById(id) : null; 2395 if (fragment == null && tag != null) { 2396 fragment = findFragmentByTag(tag); 2397 } 2398 if (fragment == null && containerId != View.NO_ID) { 2399 fragment = findFragmentById(containerId); 2400 } 2401 2402 if (FragmentManagerImpl.DEBUG) Log.v(TAG, "onCreateView: id=0x" 2403 + Integer.toHexString(id) + " fname=" + fname 2404 + " existing=" + fragment); 2405 if (fragment == null) { 2406 fragment = Fragment.instantiate(context, fname); 2407 fragment.mFromLayout = true; 2408 fragment.mFragmentId = id != 0 ? id : containerId; 2409 fragment.mContainerId = containerId; 2410 fragment.mTag = tag; 2411 fragment.mInLayout = true; 2412 fragment.mFragmentManager = this; 2413 fragment.mHost = mHost; 2414 fragment.onInflate(mHost.getContext(), attrs, fragment.mSavedFragmentState); 2415 addFragment(fragment, true); 2416 2417 } else if (fragment.mInLayout) { 2418 // A fragment already exists and it is not one we restored from 2419 // previous state. 2420 throw new IllegalArgumentException(attrs.getPositionDescription() 2421 + ": Duplicate id 0x" + Integer.toHexString(id) 2422 + ", tag " + tag + ", or parent id 0x" + Integer.toHexString(containerId) 2423 + " with another fragment for " + fname); 2424 } else { 2425 // This fragment was retained from a previous instance; get it 2426 // going now. 2427 fragment.mInLayout = true; 2428 fragment.mHost = mHost; 2429 // If this fragment is newly instantiated (either right now, or 2430 // from last saved state), then give it the attributes to 2431 // initialize itself. 2432 if (!fragment.mRetaining) { 2433 fragment.onInflate(mHost.getContext(), attrs, fragment.mSavedFragmentState); 2434 } 2435 } 2436 2437 // If we haven't finished entering the CREATED state ourselves yet, 2438 // push the inflated child fragment along. 2439 if (mCurState < Fragment.CREATED && fragment.mFromLayout) { 2440 moveToState(fragment, Fragment.CREATED, 0, 0, false); 2441 } else { 2442 moveToState(fragment); 2443 } 2444 2445 if (fragment.mView == null) { 2446 throw new IllegalStateException("Fragment " + fname 2447 + " did not create a view."); 2448 } 2449 if (id != 0) { 2450 fragment.mView.setId(id); 2451 } 2452 if (fragment.mView.getTag() == null) { 2453 fragment.mView.setTag(tag); 2454 } 2455 return fragment.mView; 2456 } 2457 getLayoutInflaterFactory()2458 LayoutInflaterFactory getLayoutInflaterFactory() { 2459 return this; 2460 } 2461 2462 static class FragmentTag { 2463 public static final int[] Fragment = { 2464 0x01010003, 0x010100d0, 0x010100d1 2465 }; 2466 public static final int Fragment_id = 1; 2467 public static final int Fragment_name = 0; 2468 public static final int Fragment_tag = 2; 2469 } 2470 } 2471