Fragment.java revision 89b09da7b3b1e69264d9ec710c66eb2f891b313e
1/* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.app; 18 19import android.animation.Animator; 20import android.content.ComponentCallbacks; 21import android.content.Context; 22import android.content.Intent; 23import android.content.res.Configuration; 24import android.content.res.Resources; 25import android.os.Bundle; 26import android.os.Parcel; 27import android.os.Parcelable; 28import android.util.AndroidRuntimeException; 29import android.util.AttributeSet; 30import android.util.DebugUtils; 31import android.util.SparseArray; 32import android.view.ContextMenu; 33import android.view.LayoutInflater; 34import android.view.Menu; 35import android.view.MenuInflater; 36import android.view.MenuItem; 37import android.view.View; 38import android.view.ViewGroup; 39import android.view.ContextMenu.ContextMenuInfo; 40import android.view.View.OnCreateContextMenuListener; 41import android.widget.AdapterView; 42 43import java.io.FileDescriptor; 44import java.io.PrintWriter; 45import java.util.HashMap; 46 47final class FragmentState implements Parcelable { 48 final String mClassName; 49 final int mIndex; 50 final boolean mFromLayout; 51 final int mFragmentId; 52 final int mContainerId; 53 final String mTag; 54 final boolean mRetainInstance; 55 final boolean mDetached; 56 final Bundle mArguments; 57 58 Bundle mSavedFragmentState; 59 60 Fragment mInstance; 61 62 public FragmentState(Fragment frag) { 63 mClassName = frag.getClass().getName(); 64 mIndex = frag.mIndex; 65 mFromLayout = frag.mFromLayout; 66 mFragmentId = frag.mFragmentId; 67 mContainerId = frag.mContainerId; 68 mTag = frag.mTag; 69 mRetainInstance = frag.mRetainInstance; 70 mDetached = frag.mDetached; 71 mArguments = frag.mArguments; 72 } 73 74 public FragmentState(Parcel in) { 75 mClassName = in.readString(); 76 mIndex = in.readInt(); 77 mFromLayout = in.readInt() != 0; 78 mFragmentId = in.readInt(); 79 mContainerId = in.readInt(); 80 mTag = in.readString(); 81 mRetainInstance = in.readInt() != 0; 82 mDetached = in.readInt() != 0; 83 mArguments = in.readBundle(); 84 mSavedFragmentState = in.readBundle(); 85 } 86 87 public Fragment instantiate(Activity activity) { 88 if (mInstance != null) { 89 return mInstance; 90 } 91 92 if (mArguments != null) { 93 mArguments.setClassLoader(activity.getClassLoader()); 94 } 95 96 mInstance = Fragment.instantiate(activity, mClassName, mArguments); 97 98 if (mSavedFragmentState != null) { 99 mSavedFragmentState.setClassLoader(activity.getClassLoader()); 100 mInstance.mSavedFragmentState = mSavedFragmentState; 101 } 102 mInstance.setIndex(mIndex); 103 mInstance.mFromLayout = mFromLayout; 104 mInstance.mRestored = true; 105 mInstance.mFragmentId = mFragmentId; 106 mInstance.mContainerId = mContainerId; 107 mInstance.mTag = mTag; 108 mInstance.mRetainInstance = mRetainInstance; 109 mInstance.mDetached = mDetached; 110 mInstance.mFragmentManager = activity.mFragments; 111 112 return mInstance; 113 } 114 115 public int describeContents() { 116 return 0; 117 } 118 119 public void writeToParcel(Parcel dest, int flags) { 120 dest.writeString(mClassName); 121 dest.writeInt(mIndex); 122 dest.writeInt(mFromLayout ? 1 : 0); 123 dest.writeInt(mFragmentId); 124 dest.writeInt(mContainerId); 125 dest.writeString(mTag); 126 dest.writeInt(mRetainInstance ? 1 : 0); 127 dest.writeInt(mDetached ? 1 : 0); 128 dest.writeBundle(mArguments); 129 dest.writeBundle(mSavedFragmentState); 130 } 131 132 public static final Parcelable.Creator<FragmentState> CREATOR 133 = new Parcelable.Creator<FragmentState>() { 134 public FragmentState createFromParcel(Parcel in) { 135 return new FragmentState(in); 136 } 137 138 public FragmentState[] newArray(int size) { 139 return new FragmentState[size]; 140 } 141 }; 142} 143 144/** 145 * A Fragment is a piece of an application's user interface or behavior 146 * that can be placed in an {@link Activity}. Interaction with fragments 147 * is done through {@link FragmentManager}, which can be obtained via 148 * {@link Activity#getFragmentManager() Activity.getFragmentManager()} and 149 * {@link Fragment#getFragmentManager() Fragment.getFragmentManager()}. 150 * 151 * <p>The Fragment class can be used many ways to achieve a wide variety of 152 * results. It is core, it represents a particular operation or interface 153 * that is running within a larger {@link Activity}. A Fragment is closely 154 * tied to the Activity it is in, and can not be used apart from one. Though 155 * Fragment defines its own lifecycle, that lifecycle is dependent on its 156 * activity: if the activity is stopped, no fragments inside of it can be 157 * started; when the activity is destroyed, all fragments will be destroyed. 158 * 159 * <p>All subclasses of Fragment must include a public empty constructor. 160 * The framework will often re-instantiate a fragment class when needed, 161 * in particular during state restore, and needs to be able to find this 162 * constructor to instantiate it. If the empty constructor is not available, 163 * a runtime exception will occur in some cases during state restore. 164 * 165 * <p>Topics covered here: 166 * <ol> 167 * <li><a href="#OlderPlatforms">Older Platforms</a> 168 * <li><a href="#Lifecycle">Lifecycle</a> 169 * <li><a href="#Layout">Layout</a> 170 * <li><a href="#BackStack">Back Stack</a> 171 * </ol> 172 * 173 * <a name="OlderPlatforms"></a> 174 * <h3>Older Platforms</h3> 175 * 176 * While the Fragment API was introduced in 177 * {@link android.os.Build.VERSION_CODES#HONEYCOMB}, a version of the API 178 * is also available for use on older platforms. See the blog post 179 * <a href="http://android-developers.blogspot.com/2011/03/fragments-for-all.html"> 180 * Fragments For All</a> for more details. 181 * 182 * <a name="Lifecycle"></a> 183 * <h3>Lifecycle</h3> 184 * 185 * <p>Though a Fragment's lifecycle is tied to its owning activity, it has 186 * its own wrinkle on the standard activity lifecycle. It includes basic 187 * activity lifecycle methods such as {@link #onResume}, but also important 188 * are methods related to interactions with the activity and UI generation. 189 * 190 * <p>The core series of lifecycle methods that are called to bring a fragment 191 * up to resumed state (interacting with the user) are: 192 * 193 * <ol> 194 * <li> {@link #onAttach} called once the fragment is associated with its activity. 195 * <li> {@link #onCreate} called to do initial creation of the fragment. 196 * <li> {@link #onCreateView} creates and returns the view hierarchy associated 197 * with the fragment. 198 * <li> {@link #onActivityCreated} tells the fragment that its activity has 199 * completed its own {@link Activity#onCreate Activity.onCreaate}. 200 * <li> {@link #onStart} makes the fragment visible to the user (based on its 201 * containing activity being started). 202 * <li> {@link #onResume} makes the fragment interacting with the user (based on its 203 * containing activity being resumed). 204 * </ol> 205 * 206 * <p>As a fragment is no longer being used, it goes through a reverse 207 * series of callbacks: 208 * 209 * <ol> 210 * <li> {@link #onPause} fragment is no longer interacting with the user either 211 * because its activity is being paused or a fragment operation is modifying it 212 * in the activity. 213 * <li> {@link #onStop} fragment is no longer visible to the user either 214 * because its activity is being stopped or a fragment operation is modifying it 215 * in the activity. 216 * <li> {@link #onDestroyView} allows the fragment to clean up resources 217 * associated with its View. 218 * <li> {@link #onDestroy} called to do final cleanup of the fragment's state. 219 * <li> {@link #onDetach} called immediately prior to the fragment no longer 220 * being associated with its activity. 221 * </ol> 222 * 223 * <a name="Layout"></a> 224 * <h3>Layout</h3> 225 * 226 * <p>Fragments can be used as part of your application's layout, allowing 227 * you to better modularize your code and more easily adjust your user 228 * interface to the screen it is running on. As an example, we can look 229 * at a simple program consisting of a list of items, and display of the 230 * details of each item.</p> 231 * 232 * <p>An activity's layout XML can include <code><fragment></code> tags 233 * to embed fragment instances inside of the layout. For example, here is 234 * a simple layout that embeds one fragment:</p> 235 * 236 * {@sample development/samples/ApiDemos/res/layout/fragment_layout.xml layout} 237 * 238 * <p>The layout is installed in the activity in the normal way:</p> 239 * 240 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 241 * main} 242 * 243 * <p>The titles fragment, showing a list of titles, is fairly simple, relying 244 * on {@link ListFragment} for most of its work. Note the implementation of 245 * clicking an item: depending on the current activity's layout, it can either 246 * create and display a new fragment to show the details in-place (more about 247 * this later), or start a new activity to show the details.</p> 248 * 249 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 250 * titles} 251 * 252 * <p>The details fragment showing the contents of a selected item just 253 * displays a string of text based on an index of a string array built in to 254 * the app:</p> 255 * 256 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 257 * details} 258 * 259 * <p>In this case when the user clicks on a title, there is no details 260 * container in the current activity, so the titles fragment's click code will 261 * launch a new activity to display the details fragment:</p> 262 * 263 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 264 * details_activity} 265 * 266 * <p>However the screen may be large enough to show both the list of titles 267 * and details about the currently selected title. To use such a layout on 268 * a landscape screen, this alternative layout can be placed under layout-land:</p> 269 * 270 * {@sample development/samples/ApiDemos/res/layout-land/fragment_layout.xml layout} 271 * 272 * <p>Note how the prior code will adjust to this alternative UI flow: the titles 273 * fragment will now embed the details fragment inside of this activity, and the 274 * details activity will finish itself if it is running in a configuration 275 * where the details can be shown in-place. 276 * 277 * <p>When a configuration change causes the activity hosting these fragments 278 * to restart, its new instance may use a different layout that doesn't 279 * include the same fragments as the previous layout. In this case all of 280 * the previous fragments will still be instantiated and running in the new 281 * instance. However, any that are no longer associated with a <fragment> 282 * tag in the view hierarchy will not have their content view created 283 * and will return false from {@link #isInLayout}. (The code here also shows 284 * how you can determine if a fragment placed in a container is no longer 285 * running in a layout with that container and avoid creating its view hierarchy 286 * in that case.) 287 * 288 * <p>The attributes of the <fragment> tag are used to control the 289 * LayoutParams provided when attaching the fragment's view to the parent 290 * container. They can also be parsed by the fragment in {@link #onInflate} 291 * as parameters. 292 * 293 * <p>The fragment being instantiated must have some kind of unique identifier 294 * so that it can be re-associated with a previous instance if the parent 295 * activity needs to be destroyed and recreated. This can be provided these 296 * ways: 297 * 298 * <ul> 299 * <li>If nothing is explicitly supplied, the view ID of the container will 300 * be used. 301 * <li><code>android:tag</code> can be used in <fragment> to provide 302 * a specific tag name for the fragment. 303 * <li><code>android:id</code> can be used in <fragment> to provide 304 * a specific identifier for the fragment. 305 * </ul> 306 * 307 * <a name="BackStack"></a> 308 * <h3>Back Stack</h3> 309 * 310 * <p>The transaction in which fragments are modified can be placed on an 311 * internal back-stack of the owning activity. When the user presses back 312 * in the activity, any transactions on the back stack are popped off before 313 * the activity itself is finished. 314 * 315 * <p>For example, consider this simple fragment that is instantiated with 316 * an integer argument and displays that in a TextView in its UI:</p> 317 * 318 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentStack.java 319 * fragment} 320 * 321 * <p>A function that creates a new instance of the fragment, replacing 322 * whatever current fragment instance is being shown and pushing that change 323 * on to the back stack could be written as: 324 * 325 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentStack.java 326 * add_stack} 327 * 328 * <p>After each call to this function, a new entry is on the stack, and 329 * pressing back will pop it to return the user to whatever previous state 330 * the activity UI was in. 331 */ 332public class Fragment implements ComponentCallbacks, OnCreateContextMenuListener { 333 private static final HashMap<String, Class<?>> sClassMap = 334 new HashMap<String, Class<?>>(); 335 336 static final int INITIALIZING = 0; // Not yet created. 337 static final int CREATED = 1; // Created. 338 static final int ACTIVITY_CREATED = 2; // The activity has finished its creation. 339 static final int STOPPED = 3; // Fully created, not started. 340 static final int STARTED = 4; // Created and started, not resumed. 341 static final int RESUMED = 5; // Created started and resumed. 342 343 int mState = INITIALIZING; 344 345 // Non-null if the fragment's view hierarchy is currently animating away, 346 // meaning we need to wait a bit on completely destroying it. This is the 347 // animation that is running. 348 Animator mAnimatingAway; 349 350 // If mAnimatingAway != null, this is the state we should move to once the 351 // animation is done. 352 int mStateAfterAnimating; 353 354 // When instantiated from saved state, this is the saved state. 355 Bundle mSavedFragmentState; 356 SparseArray<Parcelable> mSavedViewState; 357 358 // Index into active fragment array. 359 int mIndex = -1; 360 361 // Internal unique name for this fragment; 362 String mWho; 363 364 // Construction arguments; 365 Bundle mArguments; 366 367 // Target fragment. 368 Fragment mTarget; 369 370 // For use when retaining a fragment: this is the index of the last mTarget. 371 int mTargetIndex = -1; 372 373 // Target request code. 374 int mTargetRequestCode; 375 376 // True if the fragment is in the list of added fragments. 377 boolean mAdded; 378 379 // If set this fragment is being removed from its activity. 380 boolean mRemoving; 381 382 // True if the fragment is in the resumed state. 383 boolean mResumed; 384 385 // Set to true if this fragment was instantiated from a layout file. 386 boolean mFromLayout; 387 388 // Set to true when the view has actually been inflated in its layout. 389 boolean mInLayout; 390 391 // True if this fragment has been restored from previously saved state. 392 boolean mRestored; 393 394 // Number of active back stack entries this fragment is in. 395 int mBackStackNesting; 396 397 // The fragment manager we are associated with. Set as soon as the 398 // fragment is used in a transaction; cleared after it has been removed 399 // from all transactions. 400 FragmentManager mFragmentManager; 401 402 // Set as soon as a fragment is added to a transaction (or removed), 403 // to be able to do validation. 404 Activity mImmediateActivity; 405 406 // Activity this fragment is attached to. 407 Activity mActivity; 408 409 // The optional identifier for this fragment -- either the container ID if it 410 // was dynamically added to the view hierarchy, or the ID supplied in 411 // layout. 412 int mFragmentId; 413 414 // When a fragment is being dynamically added to the view hierarchy, this 415 // is the identifier of the parent container it is being added to. 416 int mContainerId; 417 418 // The optional named tag for this fragment -- usually used to find 419 // fragments that are not part of the layout. 420 String mTag; 421 422 // Set to true when the app has requested that this fragment be hidden 423 // from the user. 424 boolean mHidden; 425 426 // Set to true when the app has requested that this fragment be detached. 427 boolean mDetached; 428 429 // If set this fragment would like its instance retained across 430 // configuration changes. 431 boolean mRetainInstance; 432 433 // If set this fragment is being retained across the current config change. 434 boolean mRetaining; 435 436 // If set this fragment has menu items to contribute. 437 boolean mHasMenu; 438 439 // Used to verify that subclasses call through to super class. 440 boolean mCalled; 441 442 // If app has requested a specific animation, this is the one to use. 443 int mNextAnim; 444 445 // The parent container of the fragment after dynamically added to UI. 446 ViewGroup mContainer; 447 448 // The View generated for this fragment. 449 View mView; 450 451 LoaderManagerImpl mLoaderManager; 452 boolean mLoadersStarted; 453 boolean mCheckedForLoaderManager; 454 455 /** 456 * State information that has been retrieved from a fragment instance 457 * through {@link FragmentManager#saveFragmentInstanceState(Fragment) 458 * FragmentManager.saveFragmentInstanceState}. 459 */ 460 public static class SavedState implements Parcelable { 461 final Bundle mState; 462 463 SavedState(Bundle state) { 464 mState = state; 465 } 466 467 SavedState(Parcel in, ClassLoader loader) { 468 mState = in.readBundle(); 469 if (loader != null && mState != null) { 470 mState.setClassLoader(loader); 471 } 472 } 473 474 @Override 475 public int describeContents() { 476 return 0; 477 } 478 479 @Override 480 public void writeToParcel(Parcel dest, int flags) { 481 dest.writeBundle(mState); 482 } 483 484 public static final Parcelable.ClassLoaderCreator<SavedState> CREATOR 485 = new Parcelable.ClassLoaderCreator<SavedState>() { 486 public SavedState createFromParcel(Parcel in) { 487 return new SavedState(in, null); 488 } 489 490 public SavedState createFromParcel(Parcel in, ClassLoader loader) { 491 return new SavedState(in, loader); 492 } 493 494 public SavedState[] newArray(int size) { 495 return new SavedState[size]; 496 } 497 }; 498 } 499 500 /** 501 * Thrown by {@link Fragment#instantiate(Context, String, Bundle)} when 502 * there is an instantiation failure. 503 */ 504 static public class InstantiationException extends AndroidRuntimeException { 505 public InstantiationException(String msg, Exception cause) { 506 super(msg, cause); 507 } 508 } 509 510 /** 511 * Default constructor. <strong>Every</strong> fragment must have an 512 * empty constructor, so it can be instantiated when restoring its 513 * activity's state. It is strongly recommended that subclasses do not 514 * have other constructors with parameters, since these constructors 515 * will not be called when the fragment is re-instantiated; instead, 516 * arguments can be supplied by the caller with {@link #setArguments} 517 * and later retrieved by the Fragment with {@link #getArguments}. 518 * 519 * <p>Applications should generally not implement a constructor. The 520 * first place application code an run where the fragment is ready to 521 * be used is in {@link #onAttach(Activity)}, the point where the fragment 522 * is actually associated with its activity. Some applications may also 523 * want to implement {@link #onInflate} to retrieve attributes from a 524 * layout resource, though should take care here because this happens for 525 * the fragment is attached to its activity. 526 */ 527 public Fragment() { 528 } 529 530 /** 531 * Like {@link #instantiate(Context, String, Bundle)} but with a null 532 * argument Bundle. 533 */ 534 public static Fragment instantiate(Context context, String fname) { 535 return instantiate(context, fname, null); 536 } 537 538 /** 539 * Create a new instance of a Fragment with the given class name. This is 540 * the same as calling its empty constructor. 541 * 542 * @param context The calling context being used to instantiate the fragment. 543 * This is currently just used to get its ClassLoader. 544 * @param fname The class name of the fragment to instantiate. 545 * @param args Bundle of arguments to supply to the fragment, which it 546 * can retrieve with {@link #getArguments()}. May be null. 547 * @return Returns a new fragment instance. 548 * @throws InstantiationException If there is a failure in instantiating 549 * the given fragment class. This is a runtime exception; it is not 550 * normally expected to happen. 551 */ 552 public static Fragment instantiate(Context context, String fname, Bundle args) { 553 try { 554 Class<?> clazz = sClassMap.get(fname); 555 if (clazz == null) { 556 // Class not found in the cache, see if it's real, and try to add it 557 clazz = context.getClassLoader().loadClass(fname); 558 sClassMap.put(fname, clazz); 559 } 560 Fragment f = (Fragment)clazz.newInstance(); 561 if (args != null) { 562 args.setClassLoader(f.getClass().getClassLoader()); 563 f.mArguments = args; 564 } 565 return f; 566 } catch (ClassNotFoundException e) { 567 throw new InstantiationException("Unable to instantiate fragment " + fname 568 + ": make sure class name exists, is public, and has an" 569 + " empty constructor that is public", e); 570 } catch (java.lang.InstantiationException e) { 571 throw new InstantiationException("Unable to instantiate fragment " + fname 572 + ": make sure class name exists, is public, and has an" 573 + " empty constructor that is public", e); 574 } catch (IllegalAccessException e) { 575 throw new InstantiationException("Unable to instantiate fragment " + fname 576 + ": make sure class name exists, is public, and has an" 577 + " empty constructor that is public", e); 578 } 579 } 580 581 final void restoreViewState() { 582 if (mSavedViewState != null) { 583 mView.restoreHierarchyState(mSavedViewState); 584 mSavedViewState = null; 585 } 586 } 587 588 final void setIndex(int index) { 589 mIndex = index; 590 mWho = "android:fragment:" + mIndex; 591 } 592 593 final boolean isInBackStack() { 594 return mBackStackNesting > 0; 595 } 596 597 /** 598 * Subclasses can not override equals(). 599 */ 600 @Override final public boolean equals(Object o) { 601 return super.equals(o); 602 } 603 604 /** 605 * Subclasses can not override hashCode(). 606 */ 607 @Override final public int hashCode() { 608 return super.hashCode(); 609 } 610 611 @Override 612 public String toString() { 613 StringBuilder sb = new StringBuilder(128); 614 DebugUtils.buildShortClassTag(this, sb); 615 if (mIndex >= 0) { 616 sb.append(" #"); 617 sb.append(mIndex); 618 } 619 if (mFragmentId != 0) { 620 sb.append(" id=0x"); 621 sb.append(Integer.toHexString(mFragmentId)); 622 } 623 if (mTag != null) { 624 sb.append(" "); 625 sb.append(mTag); 626 } 627 sb.append('}'); 628 return sb.toString(); 629 } 630 631 /** 632 * Return the identifier this fragment is known by. This is either 633 * the android:id value supplied in a layout or the container view ID 634 * supplied when adding the fragment. 635 */ 636 final public int getId() { 637 return mFragmentId; 638 } 639 640 /** 641 * Get the tag name of the fragment, if specified. 642 */ 643 final public String getTag() { 644 return mTag; 645 } 646 647 /** 648 * Supply the construction arguments for this fragment. This can only 649 * be called before the fragment has been attached to its activity; that 650 * is, you should call it immediately after constructing the fragment. The 651 * arguments supplied here will be retained across fragment destroy and 652 * creation. 653 */ 654 public void setArguments(Bundle args) { 655 if (mIndex >= 0) { 656 throw new IllegalStateException("Fragment already active"); 657 } 658 mArguments = args; 659 } 660 661 /** 662 * Return the arguments supplied when the fragment was instantiated, 663 * if any. 664 */ 665 final public Bundle getArguments() { 666 return mArguments; 667 } 668 669 /** 670 * Set the initial saved state that this Fragment should restore itself 671 * from when first being constructed, as returned by 672 * {@link FragmentManager#saveFragmentInstanceState(Fragment) 673 * FragmentManager.saveFragmentInstanceState}. 674 * 675 * @param state The state the fragment should be restored from. 676 */ 677 public void setInitialSavedState(SavedState state) { 678 if (mIndex >= 0) { 679 throw new IllegalStateException("Fragment already active"); 680 } 681 mSavedFragmentState = state != null && state.mState != null 682 ? state.mState : null; 683 } 684 685 /** 686 * Optional target for this fragment. This may be used, for example, 687 * if this fragment is being started by another, and when done wants to 688 * give a result back to the first. The target set here is retained 689 * across instances via {@link FragmentManager#putFragment 690 * FragmentManager.putFragment()}. 691 * 692 * @param fragment The fragment that is the target of this one. 693 * @param requestCode Optional request code, for convenience if you 694 * are going to call back with {@link #onActivityResult(int, int, Intent)}. 695 */ 696 public void setTargetFragment(Fragment fragment, int requestCode) { 697 mTarget = fragment; 698 mTargetRequestCode = requestCode; 699 } 700 701 /** 702 * Return the target fragment set by {@link #setTargetFragment}. 703 */ 704 final public Fragment getTargetFragment() { 705 return mTarget; 706 } 707 708 /** 709 * Return the target request code set by {@link #setTargetFragment}. 710 */ 711 final public int getTargetRequestCode() { 712 return mTargetRequestCode; 713 } 714 715 /** 716 * Return the Activity this fragment is currently associated with. 717 */ 718 final public Activity getActivity() { 719 return mActivity; 720 } 721 722 /** 723 * Return <code>getActivity().getResources()</code>. 724 */ 725 final public Resources getResources() { 726 if (mActivity == null) { 727 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 728 } 729 return mActivity.getResources(); 730 } 731 732 /** 733 * Return a localized, styled CharSequence from the application's package's 734 * default string table. 735 * 736 * @param resId Resource id for the CharSequence text 737 */ 738 public final CharSequence getText(int resId) { 739 return getResources().getText(resId); 740 } 741 742 /** 743 * Return a localized string from the application's package's 744 * default string table. 745 * 746 * @param resId Resource id for the string 747 */ 748 public final String getString(int resId) { 749 return getResources().getString(resId); 750 } 751 752 /** 753 * Return a localized formatted string from the application's package's 754 * default string table, substituting the format arguments as defined in 755 * {@link java.util.Formatter} and {@link java.lang.String#format}. 756 * 757 * @param resId Resource id for the format string 758 * @param formatArgs The format arguments that will be used for substitution. 759 */ 760 761 public final String getString(int resId, Object... formatArgs) { 762 return getResources().getString(resId, formatArgs); 763 } 764 765 /** 766 * Return the FragmentManager for interacting with fragments associated 767 * with this fragment's activity. Note that this will be non-null slightly 768 * before {@link #getActivity()}, during the time from when the fragment is 769 * placed in a {@link FragmentTransaction} until it is committed and 770 * attached to its activity. 771 */ 772 final public FragmentManager getFragmentManager() { 773 return mFragmentManager; 774 } 775 776 /** 777 * Return true if the fragment is currently added to its activity. 778 */ 779 final public boolean isAdded() { 780 return mActivity != null && mAdded; 781 } 782 783 /** 784 * Return true if the fragment has been explicitly detached from the UI. 785 * That is, {@link FragmentTransaction#detach(Fragment) 786 * FragmentTransaction.detach(Fragment)} has been used on it. 787 */ 788 final public boolean isDetached() { 789 return mDetached; 790 } 791 792 /** 793 * Return true if this fragment is currently being removed from its 794 * activity. This is <em>not</em> whether its activity is finishing, but 795 * rather whether it is in the process of being removed from its activity. 796 */ 797 final public boolean isRemoving() { 798 return mRemoving; 799 } 800 801 /** 802 * Return true if the layout is included as part of an activity view 803 * hierarchy via the <fragment> tag. This will always be true when 804 * fragments are created through the <fragment> tag, <em>except</em> 805 * in the case where an old fragment is restored from a previous state and 806 * it does not appear in the layout of the current state. 807 */ 808 final public boolean isInLayout() { 809 return mInLayout; 810 } 811 812 /** 813 * Return true if the fragment is in the resumed state. This is true 814 * for the duration of {@link #onResume()} and {@link #onPause()} as well. 815 */ 816 final public boolean isResumed() { 817 return mResumed; 818 } 819 820 /** 821 * Return true if the fragment is currently visible to the user. This means 822 * it: (1) has been added, (2) has its view attached to the window, and 823 * (3) is not hidden. 824 */ 825 final public boolean isVisible() { 826 return isAdded() && !isHidden() && mView != null 827 && mView.getWindowToken() != null && mView.getVisibility() == View.VISIBLE; 828 } 829 830 /** 831 * Return true if the fragment has been hidden. By default fragments 832 * are shown. You can find out about changes to this state with 833 * {@link #onHiddenChanged}. Note that the hidden state is orthogonal 834 * to other states -- that is, to be visible to the user, a fragment 835 * must be both started and not hidden. 836 */ 837 final public boolean isHidden() { 838 return mHidden; 839 } 840 841 /** 842 * Called when the hidden state (as returned by {@link #isHidden()} of 843 * the fragment has changed. Fragments start out not hidden; this will 844 * be called whenever the fragment changes state from that. 845 * @param hidden True if the fragment is now hidden, false if it is not 846 * visible. 847 */ 848 public void onHiddenChanged(boolean hidden) { 849 } 850 851 /** 852 * Control whether a fragment instance is retained across Activity 853 * re-creation (such as from a configuration change). This can only 854 * be used with fragments not in the back stack. If set, the fragment 855 * lifecycle will be slightly different when an activity is recreated: 856 * <ul> 857 * <li> {@link #onDestroy()} will not be called (but {@link #onDetach()} still 858 * will be, because the fragment is being detached from its current activity). 859 * <li> {@link #onCreate(Bundle)} will not be called since the fragment 860 * is not being re-created. 861 * <li> {@link #onAttach(Activity)} and {@link #onActivityCreated(Bundle)} <b>will</b> 862 * still be called. 863 * </ul> 864 */ 865 public void setRetainInstance(boolean retain) { 866 mRetainInstance = retain; 867 } 868 869 final public boolean getRetainInstance() { 870 return mRetainInstance; 871 } 872 873 /** 874 * Report that this fragment would like to participate in populating 875 * the options menu by receiving a call to {@link #onCreateOptionsMenu} 876 * and related methods. 877 * 878 * @param hasMenu If true, the fragment has menu items to contribute. 879 */ 880 public void setHasOptionsMenu(boolean hasMenu) { 881 if (mHasMenu != hasMenu) { 882 mHasMenu = hasMenu; 883 if (isAdded() && !isHidden() && isResumed()) { 884 mActivity.invalidateOptionsMenu(); 885 } 886 } 887 } 888 889 /** 890 * Return the LoaderManager for this fragment, creating it if needed. 891 */ 892 public LoaderManager getLoaderManager() { 893 if (mLoaderManager != null) { 894 return mLoaderManager; 895 } 896 if (mActivity == null) { 897 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 898 } 899 mCheckedForLoaderManager = true; 900 mLoaderManager = mActivity.getLoaderManager(mIndex, mLoadersStarted, true); 901 return mLoaderManager; 902 } 903 904 /** 905 * Call {@link Activity#startActivity(Intent)} on the fragment's 906 * containing Activity. 907 */ 908 public void startActivity(Intent intent) { 909 if (mActivity == null) { 910 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 911 } 912 mActivity.startActivityFromFragment(this, intent, -1); 913 } 914 915 /** 916 * Call {@link Activity#startActivityForResult(Intent, int)} on the fragment's 917 * containing Activity. 918 */ 919 public void startActivityForResult(Intent intent, int requestCode) { 920 if (mActivity == null) { 921 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 922 } 923 mActivity.startActivityFromFragment(this, intent, requestCode); 924 } 925 926 /** 927 * Receive the result from a previous call to 928 * {@link #startActivityForResult(Intent, int)}. This follows the 929 * related Activity API as described there in 930 * {@link Activity#onActivityResult(int, int, Intent)}. 931 * 932 * @param requestCode The integer request code originally supplied to 933 * startActivityForResult(), allowing you to identify who this 934 * result came from. 935 * @param resultCode The integer result code returned by the child activity 936 * through its setResult(). 937 * @param data An Intent, which can return result data to the caller 938 * (various data can be attached to Intent "extras"). 939 */ 940 public void onActivityResult(int requestCode, int resultCode, Intent data) { 941 } 942 943 /** 944 * @hide Hack so that DialogFragment can make its Dialog before creating 945 * its views, and the view construction can use the dialog's context for 946 * inflation. Maybe this should become a public API. Note sure. 947 */ 948 public LayoutInflater getLayoutInflater(Bundle savedInstanceState) { 949 return mActivity.getLayoutInflater(); 950 } 951 952 /** 953 * @deprecated Use {@link #onInflate(Activity, AttributeSet, Bundle)} instead. 954 */ 955 @Deprecated 956 public void onInflate(AttributeSet attrs, Bundle savedInstanceState) { 957 mCalled = true; 958 } 959 960 /** 961 * Called when a fragment is being created as part of a view layout 962 * inflation, typically from setting the content view of an activity. This 963 * may be called immediately after the fragment is created from a <fragment> 964 * tag in a layout file. Note this is <em>before</em> the fragment's 965 * {@link #onAttach(Activity)} has been called; all you should do here is 966 * parse the attributes and save them away. 967 * 968 * <p>This is called every time the fragment is inflated, even if it is 969 * being inflated into a new instance with saved state. It typically makes 970 * sense to re-parse the parameters each time, to allow them to change with 971 * different configurations.</p> 972 * 973 * <p>Here is a typical implementation of a fragment that can take parameters 974 * both through attributes supplied here as well from {@link #getArguments()}:</p> 975 * 976 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentArguments.java 977 * fragment} 978 * 979 * <p>Note that parsing the XML attributes uses a "styleable" resource. The 980 * declaration for the styleable used here is:</p> 981 * 982 * {@sample development/samples/ApiDemos/res/values/attrs.xml fragment_arguments} 983 * 984 * <p>The fragment can then be declared within its activity's content layout 985 * through a tag like this:</p> 986 * 987 * {@sample development/samples/ApiDemos/res/layout/fragment_arguments.xml from_attributes} 988 * 989 * <p>This fragment can also be created dynamically from arguments given 990 * at runtime in the arguments Bundle; here is an example of doing so at 991 * creation of the containing activity:</p> 992 * 993 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentArguments.java 994 * create} 995 * 996 * @param activity The Activity that is inflating this fragment. 997 * @param attrs The attributes at the tag where the fragment is 998 * being created. 999 * @param savedInstanceState If the fragment is being re-created from 1000 * a previous saved state, this is the state. 1001 */ 1002 public void onInflate(Activity activity, AttributeSet attrs, Bundle savedInstanceState) { 1003 onInflate(attrs, savedInstanceState); 1004 mCalled = true; 1005 } 1006 1007 /** 1008 * Called when a fragment is first attached to its activity. 1009 * {@link #onCreate(Bundle)} will be called after this. 1010 */ 1011 public void onAttach(Activity activity) { 1012 mCalled = true; 1013 } 1014 1015 /** 1016 * Called when a fragment loads an animation. 1017 */ 1018 public Animator onCreateAnimator(int transit, boolean enter, int nextAnim) { 1019 return null; 1020 } 1021 1022 /** 1023 * Called to do initial creation of a fragment. This is called after 1024 * {@link #onAttach(Activity)} and before 1025 * {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}. 1026 * 1027 * <p>Note that this can be called while the fragment's activity is 1028 * still in the process of being created. As such, you can not rely 1029 * on things like the activity's content view hierarchy being initialized 1030 * at this point. If you want to do work once the activity itself is 1031 * created, see {@link #onActivityCreated(Bundle)}. 1032 * 1033 * @param savedInstanceState If the fragment is being re-created from 1034 * a previous saved state, this is the state. 1035 */ 1036 public void onCreate(Bundle savedInstanceState) { 1037 mCalled = true; 1038 } 1039 1040 /** 1041 * Called immediately after {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)} 1042 * has returned, but before any saved state has been restored in to the view. 1043 * This gives subclasses a chance to initialize themselves once 1044 * they know their view hierarchy has been completely created. The fragment's 1045 * view hierarchy is not however attached to its parent at this point. 1046 * @param view The View returned by {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}. 1047 * @param savedInstanceState If non-null, this fragment is being re-constructed 1048 * from a previous saved state as given here. 1049 */ 1050 public void onViewCreated(View view, Bundle savedInstanceState) { 1051 } 1052 1053 /** 1054 * Called to have the fragment instantiate its user interface view. 1055 * This is optional, and non-graphical fragments can return null (which 1056 * is the default implementation). This will be called between 1057 * {@link #onCreate(Bundle)} and {@link #onActivityCreated(Bundle)}. 1058 * 1059 * <p>If you return a View from here, you will later be called in 1060 * {@link #onDestroyView} when the view is being released. 1061 * 1062 * @param inflater The LayoutInflater object that can be used to inflate 1063 * any views in the fragment, 1064 * @param container If non-null, this is the parent view that the fragment's 1065 * UI should be attached to. The fragment should not add the view itself, 1066 * but this can be used to generate the LayoutParams of the view. 1067 * @param savedInstanceState If non-null, this fragment is being re-constructed 1068 * from a previous saved state as given here. 1069 * 1070 * @return Return the View for the fragment's UI, or null. 1071 */ 1072 public View onCreateView(LayoutInflater inflater, ViewGroup container, 1073 Bundle savedInstanceState) { 1074 return null; 1075 } 1076 1077 /** 1078 * Get the root view for the fragment's layout (the one returned by {@link #onCreateView}), 1079 * if provided. 1080 * 1081 * @return The fragment's root view, or null if it has no layout. 1082 */ 1083 public View getView() { 1084 return mView; 1085 } 1086 1087 /** 1088 * Called when the fragment's activity has been created and this 1089 * fragment's view hierarchy instantiated. It can be used to do final 1090 * initialization once these pieces are in place, such as retrieving 1091 * views or restoring state. It is also useful for fragments that use 1092 * {@link #setRetainInstance(boolean)} to retain their instance, 1093 * as this callback tells the fragment when it is fully associated with 1094 * the new activity instance. This is called after {@link #onCreateView} 1095 * and before {@link #onStart()}. 1096 * 1097 * @param savedInstanceState If the fragment is being re-created from 1098 * a previous saved state, this is the state. 1099 */ 1100 public void onActivityCreated(Bundle savedInstanceState) { 1101 mCalled = true; 1102 } 1103 1104 /** 1105 * Called when the Fragment is visible to the user. This is generally 1106 * tied to {@link Activity#onStart() Activity.onStart} of the containing 1107 * Activity's lifecycle. 1108 */ 1109 public void onStart() { 1110 mCalled = true; 1111 1112 if (!mLoadersStarted) { 1113 mLoadersStarted = true; 1114 if (!mCheckedForLoaderManager) { 1115 mCheckedForLoaderManager = true; 1116 mLoaderManager = mActivity.getLoaderManager(mIndex, mLoadersStarted, false); 1117 } 1118 if (mLoaderManager != null) { 1119 mLoaderManager.doStart(); 1120 } 1121 } 1122 } 1123 1124 /** 1125 * Called when the fragment is visible to the user and actively running. 1126 * This is generally 1127 * tied to {@link Activity#onResume() Activity.onResume} of the containing 1128 * Activity's lifecycle. 1129 */ 1130 public void onResume() { 1131 mCalled = true; 1132 } 1133 1134 /** 1135 * Called to ask the fragment to save its current dynamic state, so it 1136 * can later be reconstructed in a new instance of its process is 1137 * restarted. If a new instance of the fragment later needs to be 1138 * created, the data you place in the Bundle here will be available 1139 * in the Bundle given to {@link #onCreate(Bundle)}, 1140 * {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}, and 1141 * {@link #onActivityCreated(Bundle)}. 1142 * 1143 * <p>This corresponds to {@link Activity#onSaveInstanceState(Bundle) 1144 * Activity.onSaveInstanceState(Bundle)} and most of the discussion there 1145 * applies here as well. Note however: <em>this method may be called 1146 * at any time before {@link #onDestroy()}</em>. There are many situations 1147 * where a fragment may be mostly torn down (such as when placed on the 1148 * back stack with no UI showing), but its state will not be saved until 1149 * its owning activity actually needs to save its state. 1150 * 1151 * @param outState Bundle in which to place your saved state. 1152 */ 1153 public void onSaveInstanceState(Bundle outState) { 1154 } 1155 1156 public void onConfigurationChanged(Configuration newConfig) { 1157 mCalled = true; 1158 } 1159 1160 /** 1161 * Called when the Fragment is no longer resumed. This is generally 1162 * tied to {@link Activity#onPause() Activity.onPause} of the containing 1163 * Activity's lifecycle. 1164 */ 1165 public void onPause() { 1166 mCalled = true; 1167 } 1168 1169 /** 1170 * Called when the Fragment is no longer started. This is generally 1171 * tied to {@link Activity#onStop() Activity.onStop} of the containing 1172 * Activity's lifecycle. 1173 */ 1174 public void onStop() { 1175 mCalled = true; 1176 } 1177 1178 public void onLowMemory() { 1179 mCalled = true; 1180 } 1181 1182 /** 1183 * Called when the view previously created by {@link #onCreateView} has 1184 * been detached from the fragment. The next time the fragment needs 1185 * to be displayed, a new view will be created. This is called 1186 * after {@link #onStop()} and before {@link #onDestroy()}. It is called 1187 * <em>regardless</em> of whether {@link #onCreateView} returned a 1188 * non-null view. Internally it is called after the view's state has 1189 * been saved but before it has been removed from its parent. 1190 */ 1191 public void onDestroyView() { 1192 mCalled = true; 1193 } 1194 1195 /** 1196 * Called when the fragment is no longer in use. This is called 1197 * after {@link #onStop()} and before {@link #onDetach()}. 1198 */ 1199 public void onDestroy() { 1200 mCalled = true; 1201 //Log.v("foo", "onDestroy: mCheckedForLoaderManager=" + mCheckedForLoaderManager 1202 // + " mLoaderManager=" + mLoaderManager); 1203 if (!mCheckedForLoaderManager) { 1204 mCheckedForLoaderManager = true; 1205 mLoaderManager = mActivity.getLoaderManager(mIndex, mLoadersStarted, false); 1206 } 1207 if (mLoaderManager != null) { 1208 mLoaderManager.doDestroy(); 1209 } 1210 } 1211 1212 /** 1213 * Called by the fragment manager once this fragment has been removed, 1214 * so that we don't have any left-over state if the application decides 1215 * to re-use the instance. This only clears state that the framework 1216 * internally manages, not things the application sets. 1217 */ 1218 void initState() { 1219 mIndex = -1; 1220 mWho = null; 1221 mAdded = false; 1222 mRemoving = false; 1223 mResumed = false; 1224 mFromLayout = false; 1225 mInLayout = false; 1226 mRestored = false; 1227 mBackStackNesting = 0; 1228 mFragmentManager = null; 1229 mActivity = mImmediateActivity = null; 1230 mFragmentId = 0; 1231 mContainerId = 0; 1232 mTag = null; 1233 mHidden = false; 1234 mDetached = false; 1235 mRetaining = false; 1236 mLoaderManager = null; 1237 mLoadersStarted = false; 1238 mCheckedForLoaderManager = false; 1239 } 1240 1241 /** 1242 * Called when the fragment is no longer attached to its activity. This 1243 * is called after {@link #onDestroy()}. 1244 */ 1245 public void onDetach() { 1246 mCalled = true; 1247 } 1248 1249 /** 1250 * Initialize the contents of the Activity's standard options menu. You 1251 * should place your menu items in to <var>menu</var>. For this method 1252 * to be called, you must have first called {@link #setHasOptionsMenu}. See 1253 * {@link Activity#onCreateOptionsMenu(Menu) Activity.onCreateOptionsMenu} 1254 * for more information. 1255 * 1256 * @param menu The options menu in which you place your items. 1257 * 1258 * @see #setHasOptionsMenu 1259 * @see #onPrepareOptionsMenu 1260 * @see #onOptionsItemSelected 1261 */ 1262 public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 1263 } 1264 1265 /** 1266 * Prepare the Screen's standard options menu to be displayed. This is 1267 * called right before the menu is shown, every time it is shown. You can 1268 * use this method to efficiently enable/disable items or otherwise 1269 * dynamically modify the contents. See 1270 * {@link Activity#onPrepareOptionsMenu(Menu) Activity.onPrepareOptionsMenu} 1271 * for more information. 1272 * 1273 * @param menu The options menu as last shown or first initialized by 1274 * onCreateOptionsMenu(). 1275 * 1276 * @see #setHasOptionsMenu 1277 * @see #onCreateOptionsMenu 1278 */ 1279 public void onPrepareOptionsMenu(Menu menu) { 1280 } 1281 1282 /** 1283 * Called when this fragment's option menu items are no longer being 1284 * included in the overall options menu. Receiving this call means that 1285 * the menu needed to be rebuilt, but this fragment's items were not 1286 * included in the newly built menu (its {@link #onCreateOptionsMenu(Menu, MenuInflater)} 1287 * was not called). 1288 */ 1289 public void onDestroyOptionsMenu() { 1290 } 1291 1292 /** 1293 * This hook is called whenever an item in your options menu is selected. 1294 * The default implementation simply returns false to have the normal 1295 * processing happen (calling the item's Runnable or sending a message to 1296 * its Handler as appropriate). You can use this method for any items 1297 * for which you would like to do processing without those other 1298 * facilities. 1299 * 1300 * <p>Derived classes should call through to the base class for it to 1301 * perform the default menu handling. 1302 * 1303 * @param item The menu item that was selected. 1304 * 1305 * @return boolean Return false to allow normal menu processing to 1306 * proceed, true to consume it here. 1307 * 1308 * @see #onCreateOptionsMenu 1309 */ 1310 public boolean onOptionsItemSelected(MenuItem item) { 1311 return false; 1312 } 1313 1314 /** 1315 * This hook is called whenever the options menu is being closed (either by the user canceling 1316 * the menu with the back/menu button, or when an item is selected). 1317 * 1318 * @param menu The options menu as last shown or first initialized by 1319 * onCreateOptionsMenu(). 1320 */ 1321 public void onOptionsMenuClosed(Menu menu) { 1322 } 1323 1324 /** 1325 * Called when a context menu for the {@code view} is about to be shown. 1326 * Unlike {@link #onCreateOptionsMenu}, this will be called every 1327 * time the context menu is about to be shown and should be populated for 1328 * the view (or item inside the view for {@link AdapterView} subclasses, 1329 * this can be found in the {@code menuInfo})). 1330 * <p> 1331 * Use {@link #onContextItemSelected(android.view.MenuItem)} to know when an 1332 * item has been selected. 1333 * <p> 1334 * The default implementation calls up to 1335 * {@link Activity#onCreateContextMenu Activity.onCreateContextMenu}, though 1336 * you can not call this implementation if you don't want that behavior. 1337 * <p> 1338 * It is not safe to hold onto the context menu after this method returns. 1339 * {@inheritDoc} 1340 */ 1341 public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { 1342 getActivity().onCreateContextMenu(menu, v, menuInfo); 1343 } 1344 1345 /** 1346 * Registers a context menu to be shown for the given view (multiple views 1347 * can show the context menu). This method will set the 1348 * {@link OnCreateContextMenuListener} on the view to this fragment, so 1349 * {@link #onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} will be 1350 * called when it is time to show the context menu. 1351 * 1352 * @see #unregisterForContextMenu(View) 1353 * @param view The view that should show a context menu. 1354 */ 1355 public void registerForContextMenu(View view) { 1356 view.setOnCreateContextMenuListener(this); 1357 } 1358 1359 /** 1360 * Prevents a context menu to be shown for the given view. This method will 1361 * remove the {@link OnCreateContextMenuListener} on the view. 1362 * 1363 * @see #registerForContextMenu(View) 1364 * @param view The view that should stop showing a context menu. 1365 */ 1366 public void unregisterForContextMenu(View view) { 1367 view.setOnCreateContextMenuListener(null); 1368 } 1369 1370 /** 1371 * This hook is called whenever an item in a context menu is selected. The 1372 * default implementation simply returns false to have the normal processing 1373 * happen (calling the item's Runnable or sending a message to its Handler 1374 * as appropriate). You can use this method for any items for which you 1375 * would like to do processing without those other facilities. 1376 * <p> 1377 * Use {@link MenuItem#getMenuInfo()} to get extra information set by the 1378 * View that added this menu item. 1379 * <p> 1380 * Derived classes should call through to the base class for it to perform 1381 * the default menu handling. 1382 * 1383 * @param item The context menu item that was selected. 1384 * @return boolean Return false to allow normal context menu processing to 1385 * proceed, true to consume it here. 1386 */ 1387 public boolean onContextItemSelected(MenuItem item) { 1388 return false; 1389 } 1390 1391 /** 1392 * Print the Fragments's state into the given stream. 1393 * 1394 * @param prefix Text to print at the front of each line. 1395 * @param fd The raw file descriptor that the dump is being sent to. 1396 * @param writer The PrintWriter to which you should dump your state. This will be 1397 * closed for you after you return. 1398 * @param args additional arguments to the dump request. 1399 */ 1400 public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) { 1401 writer.print(prefix); writer.print("mFragmentId=#"); 1402 writer.print(Integer.toHexString(mFragmentId)); 1403 writer.print(" mContainerId#="); 1404 writer.print(Integer.toHexString(mContainerId)); 1405 writer.print(" mTag="); writer.println(mTag); 1406 writer.print(prefix); writer.print("mState="); writer.print(mState); 1407 writer.print(" mIndex="); writer.print(mIndex); 1408 writer.print(" mWho="); writer.print(mWho); 1409 writer.print(" mBackStackNesting="); writer.println(mBackStackNesting); 1410 writer.print(prefix); writer.print("mAdded="); writer.print(mAdded); 1411 writer.print(" mRemoving="); writer.print(mRemoving); 1412 writer.print(" mResumed="); writer.print(mResumed); 1413 writer.print(" mFromLayout="); writer.print(mFromLayout); 1414 writer.print(" mInLayout="); writer.println(mInLayout); 1415 writer.print(prefix); writer.print("mHidden="); writer.print(mHidden); 1416 writer.print(" mDetached="); writer.print(mDetached); 1417 writer.print(" mRetainInstance="); writer.print(mRetainInstance); 1418 writer.print(" mRetaining="); writer.print(mRetaining); 1419 writer.print(" mHasMenu="); writer.println(mHasMenu); 1420 if (mFragmentManager != null) { 1421 writer.print(prefix); writer.print("mFragmentManager="); 1422 writer.println(mFragmentManager); 1423 } 1424 if (mImmediateActivity != null) { 1425 writer.print(prefix); writer.print("mImmediateActivity="); 1426 writer.println(mImmediateActivity); 1427 } 1428 if (mActivity != null) { 1429 writer.print(prefix); writer.print("mActivity="); 1430 writer.println(mActivity); 1431 } 1432 if (mArguments != null) { 1433 writer.print(prefix); writer.print("mArguments="); writer.println(mArguments); 1434 } 1435 if (mSavedFragmentState != null) { 1436 writer.print(prefix); writer.print("mSavedFragmentState="); 1437 writer.println(mSavedFragmentState); 1438 } 1439 if (mSavedViewState != null) { 1440 writer.print(prefix); writer.print("mSavedViewState="); 1441 writer.println(mSavedViewState); 1442 } 1443 if (mTarget != null) { 1444 writer.print(prefix); writer.print("mTarget="); writer.print(mTarget); 1445 writer.print(" mTargetRequestCode="); 1446 writer.println(mTargetRequestCode); 1447 } 1448 if (mNextAnim != 0) { 1449 writer.print(prefix); writer.print("mNextAnim="); writer.println(mNextAnim); 1450 } 1451 if (mContainer != null) { 1452 writer.print(prefix); writer.print("mContainer="); writer.println(mContainer); 1453 } 1454 if (mView != null) { 1455 writer.print(prefix); writer.print("mView="); writer.println(mView); 1456 } 1457 if (mAnimatingAway != null) { 1458 writer.print(prefix); writer.print("mAnimatingAway="); writer.println(mAnimatingAway); 1459 writer.print(prefix); writer.print("mStateAfterAnimating="); 1460 writer.println(mStateAfterAnimating); 1461 } 1462 if (mLoaderManager != null) { 1463 writer.print(prefix); writer.println("Loader Manager:"); 1464 mLoaderManager.dump(prefix + " ", fd, writer, args); 1465 } 1466 } 1467 1468 void performStart() { 1469 onStart(); 1470 if (mLoaderManager != null) { 1471 mLoaderManager.doReportStart(); 1472 } 1473 } 1474 1475 void performStop() { 1476 onStop(); 1477 1478 if (mLoadersStarted) { 1479 mLoadersStarted = false; 1480 if (!mCheckedForLoaderManager) { 1481 mCheckedForLoaderManager = true; 1482 mLoaderManager = mActivity.getLoaderManager(mIndex, mLoadersStarted, false); 1483 } 1484 if (mLoaderManager != null) { 1485 if (mActivity == null || !mActivity.mChangingConfigurations) { 1486 mLoaderManager.doStop(); 1487 } else { 1488 mLoaderManager.doRetain(); 1489 } 1490 } 1491 } 1492 } 1493 1494 void performDestroyView() { 1495 onDestroyView(); 1496 if (mLoaderManager != null) { 1497 mLoaderManager.doReportNextStart(); 1498 } 1499 } 1500} 1501