Fragment.java revision 4911b783aa9f4af5ac919db861751d350471f5ef
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.content.ComponentCallbacks; 20import android.content.Intent; 21import android.content.res.Configuration; 22import android.os.Bundle; 23import android.os.Parcel; 24import android.os.Parcelable; 25import android.util.AttributeSet; 26import android.util.SparseArray; 27import android.view.ContextMenu; 28import android.view.LayoutInflater; 29import android.view.Menu; 30import android.view.MenuInflater; 31import android.view.MenuItem; 32import android.view.View; 33import android.view.ViewGroup; 34import android.view.ContextMenu.ContextMenuInfo; 35import android.view.View.OnCreateContextMenuListener; 36import android.view.animation.Animation; 37import android.widget.AdapterView; 38 39import java.lang.reflect.InvocationTargetException; 40import java.util.HashMap; 41 42final class FragmentState implements Parcelable { 43 static final String VIEW_STATE_TAG = "android:view_state"; 44 45 final String mClassName; 46 final int mIndex; 47 final boolean mFromLayout; 48 final int mFragmentId; 49 final int mContainerId; 50 final String mTag; 51 final boolean mRetainInstance; 52 53 Bundle mSavedFragmentState; 54 55 Fragment mInstance; 56 57 public FragmentState(Fragment frag) { 58 mClassName = frag.getClass().getName(); 59 mIndex = frag.mIndex; 60 mFromLayout = frag.mFromLayout; 61 mFragmentId = frag.mFragmentId; 62 mContainerId = frag.mContainerId; 63 mTag = frag.mTag; 64 mRetainInstance = frag.mRetainInstance; 65 } 66 67 public FragmentState(Parcel in) { 68 mClassName = in.readString(); 69 mIndex = in.readInt(); 70 mFromLayout = in.readInt() != 0; 71 mFragmentId = in.readInt(); 72 mContainerId = in.readInt(); 73 mTag = in.readString(); 74 mRetainInstance = in.readInt() != 0; 75 mSavedFragmentState = in.readBundle(); 76 } 77 78 public Fragment instantiate(Activity activity) { 79 if (mInstance != null) { 80 return mInstance; 81 } 82 83 try { 84 mInstance = Fragment.instantiate(activity, mClassName); 85 } catch (Exception e) { 86 throw new RuntimeException("Unable to restore fragment " + mClassName, e); 87 } 88 89 if (mSavedFragmentState != null) { 90 mSavedFragmentState.setClassLoader(activity.getClassLoader()); 91 mInstance.mSavedFragmentState = mSavedFragmentState; 92 mInstance.mSavedViewState 93 = mSavedFragmentState.getSparseParcelableArray(VIEW_STATE_TAG); 94 } 95 mInstance.setIndex(mIndex); 96 mInstance.mFromLayout = mFromLayout; 97 mInstance.mFragmentId = mFragmentId; 98 mInstance.mContainerId = mContainerId; 99 mInstance.mTag = mTag; 100 mInstance.mRetainInstance = mRetainInstance; 101 102 return mInstance; 103 } 104 105 public int describeContents() { 106 return 0; 107 } 108 109 public void writeToParcel(Parcel dest, int flags) { 110 dest.writeString(mClassName); 111 dest.writeInt(mIndex); 112 dest.writeInt(mFromLayout ? 1 : 0); 113 dest.writeInt(mFragmentId); 114 dest.writeInt(mContainerId); 115 dest.writeString(mTag); 116 dest.writeInt(mRetainInstance ? 1 : 0); 117 dest.writeBundle(mSavedFragmentState); 118 } 119 120 public static final Parcelable.Creator<FragmentState> CREATOR 121 = new Parcelable.Creator<FragmentState>() { 122 public FragmentState createFromParcel(Parcel in) { 123 return new FragmentState(in); 124 } 125 126 public FragmentState[] newArray(int size) { 127 return new FragmentState[size]; 128 } 129 }; 130} 131 132/** 133 * A Fragment is a piece of an application's user interface or behavior 134 * that can be placed in an {@link Activity}. 135 */ 136public class Fragment implements ComponentCallbacks, OnCreateContextMenuListener { 137 private static final HashMap<String, Class<?>> sClassMap = 138 new HashMap<String, Class<?>>(); 139 140 static final int INITIALIZING = 0; // Not yet created. 141 static final int CREATED = 1; // Created. 142 static final int ACTIVITY_CREATED = 2; // The activity has finished its creation. 143 static final int STARTED = 3; // Created and started, not resumed. 144 static final int RESUMED = 4; // Created started and resumed. 145 146 int mState = INITIALIZING; 147 148 // When instantiated from saved state, this is the saved state. 149 Bundle mSavedFragmentState; 150 SparseArray<Parcelable> mSavedViewState; 151 152 // Index into active fragment array. 153 int mIndex = -1; 154 155 // Internal unique name for this fragment; 156 String mWho; 157 158 // True if the fragment is in the list of added fragments. 159 boolean mAdded; 160 161 // True if the fragment is in the resumed state. 162 boolean mResumed; 163 164 // Set to true if this fragment was instantiated from a layout file. 165 boolean mFromLayout; 166 167 // Number of active back stack entries this fragment is in. 168 int mBackStackNesting; 169 170 // Set as soon as a fragment is added to a transaction (or removed), 171 // to be able to do validation. 172 Activity mImmediateActivity; 173 174 // Activity this fragment is attached to. 175 Activity mActivity; 176 177 // The optional identifier for this fragment -- either the container ID if it 178 // was dynamically added to the view hierarchy, or the ID supplied in 179 // layout. 180 int mFragmentId; 181 182 // When a fragment is being dynamically added to the view hierarchy, this 183 // is the identifier of the parent container it is being added to. 184 int mContainerId; 185 186 // The optional named tag for this fragment -- usually used to find 187 // fragments that are not part of the layout. 188 String mTag; 189 190 // Set to true when the app has requested that this fragment be hidden 191 // from the user. 192 boolean mHidden; 193 194 // If set this fragment would like its instance retained across 195 // configuration changes. 196 boolean mRetainInstance; 197 198 // If set this fragment is being retained across the current config change. 199 boolean mRetaining; 200 201 // If set this fragment has menu items to contribute. 202 boolean mHasMenu; 203 204 // Used to verify that subclasses call through to super class. 205 boolean mCalled; 206 207 // If app has requested a specific animation, this is the one to use. 208 int mNextAnim; 209 210 // The parent container of the fragment after dynamically added to UI. 211 ViewGroup mContainer; 212 213 // The View generated for this fragment. 214 View mView; 215 216 LoaderManagerImpl mLoaderManager; 217 boolean mStarted; 218 219 /** 220 * Default constructor. <strong>Every</string> fragment must have an 221 * empty constructor, so it can be instantiated when restoring its 222 * activity's state. It is strongly recommended that subclasses do not 223 * have other constructors with parameters, since these constructors 224 * will not be called when the fragment is re-instantiated; instead, 225 * retrieve such parameters from the activity in {@link #onAttach(Activity)}. 226 */ 227 public Fragment() { 228 } 229 230 static Fragment instantiate(Activity activity, String fname) 231 throws NoSuchMethodException, ClassNotFoundException, 232 IllegalArgumentException, InstantiationException, 233 IllegalAccessException, InvocationTargetException { 234 Class<?> clazz = sClassMap.get(fname); 235 236 if (clazz == null) { 237 // Class not found in the cache, see if it's real, and try to add it 238 clazz = activity.getClassLoader().loadClass(fname); 239 sClassMap.put(fname, clazz); 240 } 241 return (Fragment)clazz.newInstance(); 242 } 243 244 void restoreViewState() { 245 if (mSavedViewState != null) { 246 mView.restoreHierarchyState(mSavedViewState); 247 mSavedViewState = null; 248 } 249 } 250 251 void setIndex(int index) { 252 mIndex = index; 253 mWho = "android:fragment:" + mIndex; 254 } 255 256 void clearIndex() { 257 mIndex = -1; 258 mWho = null; 259 } 260 261 /** 262 * Subclasses can not override equals(). 263 */ 264 @Override final public boolean equals(Object o) { 265 return super.equals(o); 266 } 267 268 /** 269 * Subclasses can not override hashCode(). 270 */ 271 @Override final public int hashCode() { 272 return super.hashCode(); 273 } 274 275 @Override 276 public String toString() { 277 StringBuilder sb = new StringBuilder(128); 278 sb.append("Fragment{"); 279 sb.append(Integer.toHexString(System.identityHashCode(this))); 280 if (mIndex >= 0) { 281 sb.append(" #"); 282 sb.append(mIndex); 283 } 284 if (mFragmentId != 0) { 285 sb.append(" id=0x"); 286 sb.append(Integer.toHexString(mFragmentId)); 287 } 288 if (mTag != null) { 289 sb.append(" "); 290 sb.append(mTag); 291 } 292 sb.append('}'); 293 return sb.toString(); 294 } 295 296 /** 297 * Return the identifier this fragment is known by. This is either 298 * the android:id value supplied in a layout or the container view ID 299 * supplied when adding the fragment. 300 */ 301 final public int getId() { 302 return mFragmentId; 303 } 304 305 /** 306 * Get the tag name of the fragment, if specified. 307 */ 308 final public String getTag() { 309 return mTag; 310 } 311 312 /** 313 * Return the Activity this fragment is currently associated with. 314 */ 315 final public Activity getActivity() { 316 return mActivity; 317 } 318 319 /** 320 * Return true if the fragment is currently added to its activity. 321 */ 322 final public boolean isAdded() { 323 return mActivity != null && mActivity.mFragments.mAdded.contains(this); 324 } 325 326 /** 327 * Return true if the fragment is in the resumed state. This is true 328 * for the duration of {@link #onResume()} and {@link #onPause()} as well. 329 */ 330 final public boolean isResumed() { 331 return mResumed; 332 } 333 334 /** 335 * Return true if the fragment is currently visible to the user. This means 336 * it: (1) has been added, (2) has its view attached to the window, and 337 * (3) is not hidden. 338 */ 339 final public boolean isVisible() { 340 return isAdded() && !isHidden() && mView != null 341 && mView.getWindowToken() != null && mView.getVisibility() == View.VISIBLE; 342 } 343 344 /** 345 * Return true if the fragment has been hidden. By default fragments 346 * are shown. You can find out about changes to this state with 347 * {@link #onHiddenChanged}. Note that the hidden state is orthogonal 348 * to other states -- that is, to be visible to the user, a fragment 349 * must be both started and not hidden. 350 */ 351 final public boolean isHidden() { 352 return mHidden; 353 } 354 355 /** 356 * Called when the hidden state (as returned by {@link #isHidden()} of 357 * the fragment has changed. Fragments start out not hidden; this will 358 * be called whenever the fragment changes state from that. 359 * @param hidden True if the fragment is now hidden, false if it is not 360 * visible. 361 */ 362 public void onHiddenChanged(boolean hidden) { 363 } 364 365 /** 366 * Control whether a fragment instance is retained across Activity 367 * re-creation (such as from a configuration change). This can only 368 * be used with fragments not in the back stack. If set, the fragment 369 * lifecycle will be slightly different when an activity is recreated: 370 * <ul> 371 * <li> {@link #onDestroy()} will not be called (but {@link #onDetach()} still 372 * will be, because the fragment is being detached from its current activity). 373 * <li> {@link #onCreate(Bundle)} will not be called since the fragment 374 * is not being re-created. 375 * <li> {@link #onAttach(Activity)} and {@link #onActivityCreated(Bundle)} <b>will</b> 376 * still be called. 377 * </ul> 378 */ 379 public void setRetainInstance(boolean retain) { 380 mRetainInstance = retain; 381 } 382 383 final public boolean getRetainInstance() { 384 return mRetainInstance; 385 } 386 387 /** 388 * Report that this fragment would like to participate in populating 389 * the options menu by receiving a call to {@link #onCreateOptionsMenu} 390 * and related methods. 391 * 392 * @param hasMenu If true, the fragment has menu items to contribute. 393 */ 394 public void setHasOptionsMenu(boolean hasMenu) { 395 if (mHasMenu != hasMenu) { 396 mHasMenu = hasMenu; 397 if (isAdded() && !isHidden()) { 398 mActivity.invalidateOptionsMenu(); 399 } 400 } 401 } 402 403 /** 404 * Return the LoaderManager for this fragment, creating it if needed. 405 */ 406 public LoaderManager getLoaderManager() { 407 if (mLoaderManager != null) { 408 return mLoaderManager; 409 } 410 mLoaderManager = mActivity.getLoaderManager(mIndex, mStarted); 411 return mLoaderManager; 412 } 413 414 /** 415 * Call {@link Activity#startActivity(Intent)} on the fragment's 416 * containing Activity. 417 */ 418 public void startActivity(Intent intent) { 419 mActivity.startActivityFromFragment(this, intent, -1); 420 } 421 422 /** 423 * Call {@link Activity#startActivityForResult(Intent, int)} on the fragment's 424 * containing Activity. 425 */ 426 public void startActivityForResult(Intent intent, int requestCode) { 427 mActivity.startActivityFromFragment(this, intent, requestCode); 428 } 429 430 /** 431 * Receive the result from a previous call to 432 * {@link #startActivityForResult(Intent, int)}. This follows the 433 * related Activity API as described there in 434 * {@link Activity#onActivityResult(int, int, Intent)}. 435 * 436 * @param requestCode The integer request code originally supplied to 437 * startActivityForResult(), allowing you to identify who this 438 * result came from. 439 * @param resultCode The integer result code returned by the child activity 440 * through its setResult(). 441 * @param data An Intent, which can return result data to the caller 442 * (various data can be attached to Intent "extras"). 443 */ 444 public void onActivityResult(int requestCode, int resultCode, Intent data) { 445 } 446 447 /** 448 * Called when a fragment is being created as part of a view layout 449 * inflation, typically from setting the content view of an activity. This 450 * will be called both the first time the fragment is created, as well 451 * later when it is being re-created from its saved state (which is also 452 * given here). 453 * 454 * XXX This is kind-of yucky... maybe we could just supply the 455 * AttributeSet to onCreate()? 456 * 457 * @param activity The Activity that is inflating the fragment. 458 * @param attrs The attributes at the tag where the fragment is 459 * being created. 460 * @param savedInstanceState If the fragment is being re-created from 461 * a previous saved state, this is the state. 462 */ 463 public void onInflate(Activity activity, AttributeSet attrs, 464 Bundle savedInstanceState) { 465 mCalled = true; 466 } 467 468 /** 469 * Called when a fragment is first attached to its activity. 470 * {@link #onCreate(Bundle)} will be called after this. 471 */ 472 public void onAttach(Activity activity) { 473 mCalled = true; 474 } 475 476 public Animation onCreateAnimation(int transit, boolean enter, int nextAnim) { 477 return null; 478 } 479 480 /** 481 * Called to do initial creation of a fragment. This is called after 482 * {@link #onAttach(Activity)} and before 483 * {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}. 484 * 485 * <p>Note that this can be called while the fragment's activity is 486 * still in the process of being created. As such, you can not rely 487 * on things like the activity's content view hierarchy being initialized 488 * at this point. If you want to do work once the activity itself is 489 * created, see {@link #onActivityCreated(Bundle)}. 490 * 491 * @param savedInstanceState If the fragment is being re-created from 492 * a previous saved state, this is the state. 493 */ 494 public void onCreate(Bundle savedInstanceState) { 495 mCalled = true; 496 } 497 498 /** 499 * Called to have the fragment instantiate its user interface view. 500 * This is optional, and non-graphical fragments can return null (which 501 * is the default implementation). This will be called between 502 * {@link #onCreate(Bundle)} and {@link #onActivityCreated(Bundle)}. 503 * 504 * <p>If you return a View from here, you will later be called in 505 * {@link #onDestroyView} when the view is being released. 506 * 507 * @param inflater The LayoutInflater object that can be used to inflate 508 * any views in the fragment, 509 * @param container If non-null, this is the parent view that the fragment's 510 * UI should be attached to. The fragment should not add the view itself, 511 * but this can be used to generate the LayoutParams of the view. 512 * @param savedInstanceState If non-null, this fragment is being re-constructed 513 * from a previous saved state as given here. 514 * 515 * @return Return the View for the fragment's UI, or null. 516 */ 517 public View onCreateView(LayoutInflater inflater, ViewGroup container, 518 Bundle savedInstanceState) { 519 return null; 520 } 521 522 public View getView() { 523 return mView; 524 } 525 526 /** 527 * Called when the fragment's activity has been created and this 528 * fragment's view hierarchy instantiated. It can be used to do final 529 * initialization once these pieces are in place, such as retrieving 530 * views or restoring state. It is also useful for fragments that use 531 * {@link #setRetainInstance(boolean)} to retain their instance, 532 * as this callback tells the fragment when it is fully associated with 533 * the new activity instance. This is called after {@link #onCreateView} 534 * and before {@link #onStart()}. 535 * 536 * @param savedInstanceState If the fragment is being re-created from 537 * a previous saved state, this is the state. 538 */ 539 public void onActivityCreated(Bundle savedInstanceState) { 540 mCalled = true; 541 } 542 543 /** 544 * Called when the Fragment is visible to the user. This is generally 545 * tied to {@link Activity#onStart() Activity.onStart} of the containing 546 * Activity's lifecycle. 547 */ 548 public void onStart() { 549 mCalled = true; 550 mStarted = true; 551 if (mLoaderManager != null) { 552 mLoaderManager.doStart(); 553 } 554 } 555 556 /** 557 * Called when the fragment is visible to the user and actively running. 558 * This is generally 559 * tied to {@link Activity#onResume() Activity.onResume} of the containing 560 * Activity's lifecycle. 561 */ 562 public void onResume() { 563 mCalled = true; 564 } 565 566 public void onSaveInstanceState(Bundle outState) { 567 } 568 569 public void onConfigurationChanged(Configuration newConfig) { 570 mCalled = true; 571 } 572 573 /** 574 * Called when the Fragment is no longer resumed. This is generally 575 * tied to {@link Activity#onPause() Activity.onPause} of the containing 576 * Activity's lifecycle. 577 */ 578 public void onPause() { 579 mCalled = true; 580 } 581 582 /** 583 * Called when the Fragment is no longer started. This is generally 584 * tied to {@link Activity#onStop() Activity.onStop} of the containing 585 * Activity's lifecycle. 586 */ 587 public void onStop() { 588 mCalled = true; 589 } 590 591 public void onLowMemory() { 592 mCalled = true; 593 } 594 595 /** 596 * Called when the view previously created by {@link #onCreateView} has 597 * been detached from the fragment. The next time the fragment needs 598 * to be displayed, a new view will be created. This is called 599 * after {@link #onStop()} and before {@link #onDestroy()}; it is only 600 * called if {@link #onCreateView} returns a non-null View. 601 */ 602 public void onDestroyView() { 603 mCalled = true; 604 } 605 606 /** 607 * Called when the fragment is no longer in use. This is called 608 * after {@link #onStop()} and before {@link #onDetach()}. 609 */ 610 public void onDestroy() { 611 mCalled = true; 612 if (mLoaderManager != null) { 613 mLoaderManager.doDestroy(); 614 } 615 } 616 617 /** 618 * Called when the fragment is no longer attached to its activity. This 619 * is called after {@link #onDestroy()}. 620 */ 621 public void onDetach() { 622 mCalled = true; 623 } 624 625 /** 626 * Initialize the contents of the Activity's standard options menu. You 627 * should place your menu items in to <var>menu</var>. For this method 628 * to be called, you must have first called {@link #setHasOptionsMenu}. See 629 * {@link Activity#onCreateOptionsMenu(Menu) Activity.onCreateOptionsMenu} 630 * for more information. 631 * 632 * @param menu The options menu in which you place your items. 633 * 634 * @see #setHasOptionsMenu 635 * @see #onPrepareOptionsMenu 636 * @see #onOptionsItemSelected 637 */ 638 public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 639 } 640 641 /** 642 * Prepare the Screen's standard options menu to be displayed. This is 643 * called right before the menu is shown, every time it is shown. You can 644 * use this method to efficiently enable/disable items or otherwise 645 * dynamically modify the contents. See 646 * {@link Activity#onPrepareOptionsMenu(Menu) Activity.onPrepareOptionsMenu} 647 * for more information. 648 * 649 * @param menu The options menu as last shown or first initialized by 650 * onCreateOptionsMenu(). 651 * 652 * @see #setHasOptionsMenu 653 * @see #onCreateOptionsMenu 654 */ 655 public void onPrepareOptionsMenu(Menu menu) { 656 } 657 658 /** 659 * This hook is called whenever an item in your options menu is selected. 660 * The default implementation simply returns false to have the normal 661 * processing happen (calling the item's Runnable or sending a message to 662 * its Handler as appropriate). You can use this method for any items 663 * for which you would like to do processing without those other 664 * facilities. 665 * 666 * <p>Derived classes should call through to the base class for it to 667 * perform the default menu handling. 668 * 669 * @param item The menu item that was selected. 670 * 671 * @return boolean Return false to allow normal menu processing to 672 * proceed, true to consume it here. 673 * 674 * @see #onCreateOptionsMenu 675 */ 676 public boolean onOptionsItemSelected(MenuItem item) { 677 return false; 678 } 679 680 /** 681 * This hook is called whenever the options menu is being closed (either by the user canceling 682 * the menu with the back/menu button, or when an item is selected). 683 * 684 * @param menu The options menu as last shown or first initialized by 685 * onCreateOptionsMenu(). 686 */ 687 public void onOptionsMenuClosed(Menu menu) { 688 } 689 690 /** 691 * Called when a context menu for the {@code view} is about to be shown. 692 * Unlike {@link #onCreateOptionsMenu}, this will be called every 693 * time the context menu is about to be shown and should be populated for 694 * the view (or item inside the view for {@link AdapterView} subclasses, 695 * this can be found in the {@code menuInfo})). 696 * <p> 697 * Use {@link #onContextItemSelected(android.view.MenuItem)} to know when an 698 * item has been selected. 699 * <p> 700 * The default implementation calls up to 701 * {@link Activity#onCreateContextMenu Activity.onCreateContextMenu}, though 702 * you can not call this implementation if you don't want that behavior. 703 * <p> 704 * It is not safe to hold onto the context menu after this method returns. 705 * {@inheritDoc} 706 */ 707 public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { 708 getActivity().onCreateContextMenu(menu, v, menuInfo); 709 } 710 711 /** 712 * Registers a context menu to be shown for the given view (multiple views 713 * can show the context menu). This method will set the 714 * {@link OnCreateContextMenuListener} on the view to this fragment, so 715 * {@link #onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} will be 716 * called when it is time to show the context menu. 717 * 718 * @see #unregisterForContextMenu(View) 719 * @param view The view that should show a context menu. 720 */ 721 public void registerForContextMenu(View view) { 722 view.setOnCreateContextMenuListener(this); 723 } 724 725 /** 726 * Prevents a context menu to be shown for the given view. This method will 727 * remove the {@link OnCreateContextMenuListener} on the view. 728 * 729 * @see #registerForContextMenu(View) 730 * @param view The view that should stop showing a context menu. 731 */ 732 public void unregisterForContextMenu(View view) { 733 view.setOnCreateContextMenuListener(null); 734 } 735 736 /** 737 * This hook is called whenever an item in a context menu is selected. The 738 * default implementation simply returns false to have the normal processing 739 * happen (calling the item's Runnable or sending a message to its Handler 740 * as appropriate). You can use this method for any items for which you 741 * would like to do processing without those other facilities. 742 * <p> 743 * Use {@link MenuItem#getMenuInfo()} to get extra information set by the 744 * View that added this menu item. 745 * <p> 746 * Derived classes should call through to the base class for it to perform 747 * the default menu handling. 748 * 749 * @param item The context menu item that was selected. 750 * @return boolean Return false to allow normal context menu processing to 751 * proceed, true to consume it here. 752 */ 753 public boolean onContextItemSelected(MenuItem item) { 754 return false; 755 } 756 757 void performStop() { 758 onStop(); 759 if (mStarted) { 760 mStarted = false; 761 if (mLoaderManager != null) { 762 if (mActivity == null || !mActivity.mChangingConfigurations) { 763 mLoaderManager.doStop(); 764 } else { 765 mLoaderManager.doRetain(); 766 } 767 } 768 } 769 } 770} 771