Fragment.java revision adfd62c484f6d888cc9339e79619ccf72c3b133f
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.annotation.CallSuper; 21import android.annotation.NonNull; 22import android.annotation.Nullable; 23import android.annotation.StringRes; 24import android.content.ComponentCallbacks2; 25import android.content.Context; 26import android.content.Intent; 27import android.content.IntentSender; 28import android.content.res.Configuration; 29import android.content.res.Resources; 30import android.content.res.TypedArray; 31import android.os.Build; 32import android.os.Build.VERSION_CODES; 33import android.os.Bundle; 34import android.os.Handler; 35import android.os.Looper; 36import android.os.Parcel; 37import android.os.Parcelable; 38import android.transition.Transition; 39import android.transition.TransitionInflater; 40import android.transition.TransitionSet; 41import android.util.AndroidRuntimeException; 42import android.util.ArrayMap; 43import android.util.AttributeSet; 44import android.util.DebugUtils; 45import android.util.Log; 46import android.util.SparseArray; 47import android.util.SuperNotCalledException; 48import android.view.ContextMenu; 49import android.view.ContextMenu.ContextMenuInfo; 50import android.view.LayoutInflater; 51import android.view.Menu; 52import android.view.MenuInflater; 53import android.view.MenuItem; 54import android.view.View; 55import android.view.View.OnCreateContextMenuListener; 56import android.view.ViewGroup; 57import android.widget.AdapterView; 58 59import java.io.FileDescriptor; 60import java.io.PrintWriter; 61 62final class FragmentState implements Parcelable { 63 final String mClassName; 64 final int mIndex; 65 final boolean mFromLayout; 66 final int mFragmentId; 67 final int mContainerId; 68 final String mTag; 69 final boolean mRetainInstance; 70 final boolean mDetached; 71 final Bundle mArguments; 72 final boolean mHidden; 73 74 Bundle mSavedFragmentState; 75 76 Fragment mInstance; 77 78 public FragmentState(Fragment frag) { 79 mClassName = frag.getClass().getName(); 80 mIndex = frag.mIndex; 81 mFromLayout = frag.mFromLayout; 82 mFragmentId = frag.mFragmentId; 83 mContainerId = frag.mContainerId; 84 mTag = frag.mTag; 85 mRetainInstance = frag.mRetainInstance; 86 mDetached = frag.mDetached; 87 mArguments = frag.mArguments; 88 mHidden = frag.mHidden; 89 } 90 91 public FragmentState(Parcel in) { 92 mClassName = in.readString(); 93 mIndex = in.readInt(); 94 mFromLayout = in.readInt() != 0; 95 mFragmentId = in.readInt(); 96 mContainerId = in.readInt(); 97 mTag = in.readString(); 98 mRetainInstance = in.readInt() != 0; 99 mDetached = in.readInt() != 0; 100 mArguments = in.readBundle(); 101 mHidden = in.readInt() != 0; 102 mSavedFragmentState = in.readBundle(); 103 } 104 105 public Fragment instantiate(FragmentHostCallback host, FragmentContainer container, 106 Fragment parent, FragmentManagerNonConfig childNonConfig) { 107 if (mInstance == null) { 108 final Context context = host.getContext(); 109 if (mArguments != null) { 110 mArguments.setClassLoader(context.getClassLoader()); 111 } 112 113 if (container != null) { 114 mInstance = container.instantiate(context, mClassName, mArguments); 115 } else { 116 mInstance = Fragment.instantiate(context, mClassName, mArguments); 117 } 118 119 if (mSavedFragmentState != null) { 120 mSavedFragmentState.setClassLoader(context.getClassLoader()); 121 mInstance.mSavedFragmentState = mSavedFragmentState; 122 } 123 mInstance.setIndex(mIndex, parent); 124 mInstance.mFromLayout = mFromLayout; 125 mInstance.mRestored = true; 126 mInstance.mFragmentId = mFragmentId; 127 mInstance.mContainerId = mContainerId; 128 mInstance.mTag = mTag; 129 mInstance.mRetainInstance = mRetainInstance; 130 mInstance.mDetached = mDetached; 131 mInstance.mHidden = mHidden; 132 mInstance.mFragmentManager = host.mFragmentManager; 133 if (FragmentManagerImpl.DEBUG) Log.v(FragmentManagerImpl.TAG, 134 "Instantiated fragment " + mInstance); 135 } 136 mInstance.mChildNonConfig = childNonConfig; 137 return mInstance; 138 } 139 140 public int describeContents() { 141 return 0; 142 } 143 144 public void writeToParcel(Parcel dest, int flags) { 145 dest.writeString(mClassName); 146 dest.writeInt(mIndex); 147 dest.writeInt(mFromLayout ? 1 : 0); 148 dest.writeInt(mFragmentId); 149 dest.writeInt(mContainerId); 150 dest.writeString(mTag); 151 dest.writeInt(mRetainInstance ? 1 : 0); 152 dest.writeInt(mDetached ? 1 : 0); 153 dest.writeBundle(mArguments); 154 dest.writeInt(mHidden ? 1 : 0); 155 dest.writeBundle(mSavedFragmentState); 156 } 157 158 public static final Parcelable.Creator<FragmentState> CREATOR 159 = new Parcelable.Creator<FragmentState>() { 160 public FragmentState createFromParcel(Parcel in) { 161 return new FragmentState(in); 162 } 163 164 public FragmentState[] newArray(int size) { 165 return new FragmentState[size]; 166 } 167 }; 168} 169 170/** 171 * A Fragment is a piece of an application's user interface or behavior 172 * that can be placed in an {@link Activity}. Interaction with fragments 173 * is done through {@link FragmentManager}, which can be obtained via 174 * {@link Activity#getFragmentManager() Activity.getFragmentManager()} and 175 * {@link Fragment#getFragmentManager() Fragment.getFragmentManager()}. 176 * 177 * <p>The Fragment class can be used many ways to achieve a wide variety of 178 * results. In its core, it represents a particular operation or interface 179 * that is running within a larger {@link Activity}. A Fragment is closely 180 * tied to the Activity it is in, and can not be used apart from one. Though 181 * Fragment defines its own lifecycle, that lifecycle is dependent on its 182 * activity: if the activity is stopped, no fragments inside of it can be 183 * started; when the activity is destroyed, all fragments will be destroyed. 184 * 185 * <p>All subclasses of Fragment must include a public no-argument constructor. 186 * The framework will often re-instantiate a fragment class when needed, 187 * in particular during state restore, and needs to be able to find this 188 * constructor to instantiate it. If the no-argument constructor is not 189 * available, a runtime exception will occur in some cases during state 190 * restore. 191 * 192 * <p>Topics covered here: 193 * <ol> 194 * <li><a href="#OlderPlatforms">Older Platforms</a> 195 * <li><a href="#Lifecycle">Lifecycle</a> 196 * <li><a href="#Layout">Layout</a> 197 * <li><a href="#BackStack">Back Stack</a> 198 * </ol> 199 * 200 * <div class="special reference"> 201 * <h3>Developer Guides</h3> 202 * <p>For more information about using fragments, read the 203 * <a href="{@docRoot}guide/components/fragments.html">Fragments</a> developer guide.</p> 204 * </div> 205 * 206 * <a name="OlderPlatforms"></a> 207 * <h3>Older Platforms</h3> 208 * 209 * While the Fragment API was introduced in 210 * {@link android.os.Build.VERSION_CODES#HONEYCOMB}, a version of the API 211 * at is also available for use on older platforms through 212 * {@link android.support.v4.app.FragmentActivity}. See the blog post 213 * <a href="http://android-developers.blogspot.com/2011/03/fragments-for-all.html"> 214 * Fragments For All</a> for more details. 215 * 216 * <a name="Lifecycle"></a> 217 * <h3>Lifecycle</h3> 218 * 219 * <p>Though a Fragment's lifecycle is tied to its owning activity, it has 220 * its own wrinkle on the standard activity lifecycle. It includes basic 221 * activity lifecycle methods such as {@link #onResume}, but also important 222 * are methods related to interactions with the activity and UI generation. 223 * 224 * <p>The core series of lifecycle methods that are called to bring a fragment 225 * up to resumed state (interacting with the user) are: 226 * 227 * <ol> 228 * <li> {@link #onAttach} called once the fragment is associated with its activity. 229 * <li> {@link #onCreate} called to do initial creation of the fragment. 230 * <li> {@link #onCreateView} creates and returns the view hierarchy associated 231 * with the fragment. 232 * <li> {@link #onActivityCreated} tells the fragment that its activity has 233 * completed its own {@link Activity#onCreate Activity.onCreate()}. 234 * <li> {@link #onViewStateRestored} tells the fragment that all of the saved 235 * state of its view hierarchy has been restored. 236 * <li> {@link #onStart} makes the fragment visible to the user (based on its 237 * containing activity being started). 238 * <li> {@link #onResume} makes the fragment begin interacting with the user 239 * (based on its containing activity being resumed). 240 * </ol> 241 * 242 * <p>As a fragment is no longer being used, it goes through a reverse 243 * series of callbacks: 244 * 245 * <ol> 246 * <li> {@link #onPause} fragment is no longer interacting with the user either 247 * because its activity is being paused or a fragment operation is modifying it 248 * in the activity. 249 * <li> {@link #onStop} fragment is no longer visible to the user either 250 * because its activity is being stopped or a fragment operation is modifying it 251 * in the activity. 252 * <li> {@link #onDestroyView} allows the fragment to clean up resources 253 * associated with its View. 254 * <li> {@link #onDestroy} called to do final cleanup of the fragment's state. 255 * <li> {@link #onDetach} called immediately prior to the fragment no longer 256 * being associated with its activity. 257 * </ol> 258 * 259 * <a name="Layout"></a> 260 * <h3>Layout</h3> 261 * 262 * <p>Fragments can be used as part of your application's layout, allowing 263 * you to better modularize your code and more easily adjust your user 264 * interface to the screen it is running on. As an example, we can look 265 * at a simple program consisting of a list of items, and display of the 266 * details of each item.</p> 267 * 268 * <p>An activity's layout XML can include <code><fragment></code> tags 269 * to embed fragment instances inside of the layout. For example, here is 270 * a simple layout that embeds one fragment:</p> 271 * 272 * {@sample development/samples/ApiDemos/res/layout/fragment_layout.xml layout} 273 * 274 * <p>The layout is installed in the activity in the normal way:</p> 275 * 276 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 277 * main} 278 * 279 * <p>The titles fragment, showing a list of titles, is fairly simple, relying 280 * on {@link ListFragment} for most of its work. Note the implementation of 281 * clicking an item: depending on the current activity's layout, it can either 282 * create and display a new fragment to show the details in-place (more about 283 * this later), or start a new activity to show the details.</p> 284 * 285 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 286 * titles} 287 * 288 * <p>The details fragment showing the contents of a selected item just 289 * displays a string of text based on an index of a string array built in to 290 * the app:</p> 291 * 292 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 293 * details} 294 * 295 * <p>In this case when the user clicks on a title, there is no details 296 * container in the current activity, so the titles fragment's click code will 297 * launch a new activity to display the details fragment:</p> 298 * 299 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 300 * details_activity} 301 * 302 * <p>However the screen may be large enough to show both the list of titles 303 * and details about the currently selected title. To use such a layout on 304 * a landscape screen, this alternative layout can be placed under layout-land:</p> 305 * 306 * {@sample development/samples/ApiDemos/res/layout-land/fragment_layout.xml layout} 307 * 308 * <p>Note how the prior code will adjust to this alternative UI flow: the titles 309 * fragment will now embed the details fragment inside of this activity, and the 310 * details activity will finish itself if it is running in a configuration 311 * where the details can be shown in-place. 312 * 313 * <p>When a configuration change causes the activity hosting these fragments 314 * to restart, its new instance may use a different layout that doesn't 315 * include the same fragments as the previous layout. In this case all of 316 * the previous fragments will still be instantiated and running in the new 317 * instance. However, any that are no longer associated with a <fragment> 318 * tag in the view hierarchy will not have their content view created 319 * and will return false from {@link #isInLayout}. (The code here also shows 320 * how you can determine if a fragment placed in a container is no longer 321 * running in a layout with that container and avoid creating its view hierarchy 322 * in that case.) 323 * 324 * <p>The attributes of the <fragment> tag are used to control the 325 * LayoutParams provided when attaching the fragment's view to the parent 326 * container. They can also be parsed by the fragment in {@link #onInflate} 327 * as parameters. 328 * 329 * <p>The fragment being instantiated must have some kind of unique identifier 330 * so that it can be re-associated with a previous instance if the parent 331 * activity needs to be destroyed and recreated. This can be provided these 332 * ways: 333 * 334 * <ul> 335 * <li>If nothing is explicitly supplied, the view ID of the container will 336 * be used. 337 * <li><code>android:tag</code> can be used in <fragment> to provide 338 * a specific tag name for the fragment. 339 * <li><code>android:id</code> can be used in <fragment> to provide 340 * a specific identifier for the fragment. 341 * </ul> 342 * 343 * <a name="BackStack"></a> 344 * <h3>Back Stack</h3> 345 * 346 * <p>The transaction in which fragments are modified can be placed on an 347 * internal back-stack of the owning activity. When the user presses back 348 * in the activity, any transactions on the back stack are popped off before 349 * the activity itself is finished. 350 * 351 * <p>For example, consider this simple fragment that is instantiated with 352 * an integer argument and displays that in a TextView in its UI:</p> 353 * 354 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentStack.java 355 * fragment} 356 * 357 * <p>A function that creates a new instance of the fragment, replacing 358 * whatever current fragment instance is being shown and pushing that change 359 * on to the back stack could be written as: 360 * 361 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentStack.java 362 * add_stack} 363 * 364 * <p>After each call to this function, a new entry is on the stack, and 365 * pressing back will pop it to return the user to whatever previous state 366 * the activity UI was in. 367 */ 368public class Fragment implements ComponentCallbacks2, OnCreateContextMenuListener { 369 private static final ArrayMap<String, Class<?>> sClassMap = 370 new ArrayMap<String, Class<?>>(); 371 372 static final int INVALID_STATE = -1; // Invalid state used as a null value. 373 static final int INITIALIZING = 0; // Not yet created. 374 static final int CREATED = 1; // Created. 375 static final int ACTIVITY_CREATED = 2; // The activity has finished its creation. 376 static final int STOPPED = 3; // Fully created, not started. 377 static final int STARTED = 4; // Created and started, not resumed. 378 static final int RESUMED = 5; // Created started and resumed. 379 380 private static final Transition USE_DEFAULT_TRANSITION = new TransitionSet(); 381 382 int mState = INITIALIZING; 383 384 // When instantiated from saved state, this is the saved state. 385 Bundle mSavedFragmentState; 386 SparseArray<Parcelable> mSavedViewState; 387 388 // Index into active fragment array. 389 int mIndex = -1; 390 391 // Internal unique name for this fragment; 392 String mWho; 393 394 // Construction arguments; 395 Bundle mArguments; 396 397 // Target fragment. 398 Fragment mTarget; 399 400 // For use when retaining a fragment: this is the index of the last mTarget. 401 int mTargetIndex = -1; 402 403 // Target request code. 404 int mTargetRequestCode; 405 406 // True if the fragment is in the list of added fragments. 407 boolean mAdded; 408 409 // If set this fragment is being removed from its activity. 410 boolean mRemoving; 411 412 // Set to true if this fragment was instantiated from a layout file. 413 boolean mFromLayout; 414 415 // Set to true when the view has actually been inflated in its layout. 416 boolean mInLayout; 417 418 // True if this fragment has been restored from previously saved state. 419 boolean mRestored; 420 421 // True if performCreateView has been called and a matching call to performDestroyView 422 // has not yet happened. 423 boolean mPerformedCreateView; 424 425 // Number of active back stack entries this fragment is in. 426 int mBackStackNesting; 427 428 // The fragment manager we are associated with. Set as soon as the 429 // fragment is used in a transaction; cleared after it has been removed 430 // from all transactions. 431 FragmentManagerImpl mFragmentManager; 432 433 // Activity this fragment is attached to. 434 FragmentHostCallback mHost; 435 436 // Private fragment manager for child fragments inside of this one. 437 FragmentManagerImpl mChildFragmentManager; 438 439 // For use when restoring fragment state and descendant fragments are retained. 440 // This state is set by FragmentState.instantiate and cleared in onCreate. 441 FragmentManagerNonConfig mChildNonConfig; 442 443 // If this Fragment is contained in another Fragment, this is that container. 444 Fragment mParentFragment; 445 446 // The optional identifier for this fragment -- either the container ID if it 447 // was dynamically added to the view hierarchy, or the ID supplied in 448 // layout. 449 int mFragmentId; 450 451 // When a fragment is being dynamically added to the view hierarchy, this 452 // is the identifier of the parent container it is being added to. 453 int mContainerId; 454 455 // The optional named tag for this fragment -- usually used to find 456 // fragments that are not part of the layout. 457 String mTag; 458 459 // Set to true when the app has requested that this fragment be hidden 460 // from the user. 461 boolean mHidden; 462 463 // Set to true when the app has requested that this fragment be detached. 464 boolean mDetached; 465 466 // If set this fragment would like its instance retained across 467 // configuration changes. 468 boolean mRetainInstance; 469 470 // If set this fragment is being retained across the current config change. 471 boolean mRetaining; 472 473 // If set this fragment has menu items to contribute. 474 boolean mHasMenu; 475 476 // Set to true to allow the fragment's menu to be shown. 477 boolean mMenuVisible = true; 478 479 // Used to verify that subclasses call through to super class. 480 boolean mCalled; 481 482 // The parent container of the fragment after dynamically added to UI. 483 ViewGroup mContainer; 484 485 // The View generated for this fragment. 486 View mView; 487 488 // Whether this fragment should defer starting until after other fragments 489 // have been started and their loaders are finished. 490 boolean mDeferStart; 491 492 // Hint provided by the app that this fragment is currently visible to the user. 493 boolean mUserVisibleHint = true; 494 495 LoaderManagerImpl mLoaderManager; 496 boolean mLoadersStarted; 497 boolean mCheckedForLoaderManager; 498 499 // The animation and transition information for the fragment. This will be null 500 // unless the elements are explicitly accessed and should remain null for Fragments 501 // without Views. 502 AnimationInfo mAnimationInfo; 503 504 // True if the View was added, and its animation has yet to be run. This could 505 // also indicate that the fragment view hasn't been made visible, even if there is no 506 // animation for this fragment. 507 boolean mIsNewlyAdded; 508 509 // True if mHidden has been changed and the animation should be scheduled. 510 boolean mHiddenChanged; 511 512 /** 513 * State information that has been retrieved from a fragment instance 514 * through {@link FragmentManager#saveFragmentInstanceState(Fragment) 515 * FragmentManager.saveFragmentInstanceState}. 516 */ 517 public static class SavedState implements Parcelable { 518 final Bundle mState; 519 520 SavedState(Bundle state) { 521 mState = state; 522 } 523 524 SavedState(Parcel in, ClassLoader loader) { 525 mState = in.readBundle(); 526 if (loader != null && mState != null) { 527 mState.setClassLoader(loader); 528 } 529 } 530 531 @Override 532 public int describeContents() { 533 return 0; 534 } 535 536 @Override 537 public void writeToParcel(Parcel dest, int flags) { 538 dest.writeBundle(mState); 539 } 540 541 public static final Parcelable.ClassLoaderCreator<SavedState> CREATOR 542 = new Parcelable.ClassLoaderCreator<SavedState>() { 543 public SavedState createFromParcel(Parcel in) { 544 return new SavedState(in, null); 545 } 546 547 public SavedState createFromParcel(Parcel in, ClassLoader loader) { 548 return new SavedState(in, loader); 549 } 550 551 public SavedState[] newArray(int size) { 552 return new SavedState[size]; 553 } 554 }; 555 } 556 557 /** 558 * Thrown by {@link Fragment#instantiate(Context, String, Bundle)} when 559 * there is an instantiation failure. 560 */ 561 static public class InstantiationException extends AndroidRuntimeException { 562 public InstantiationException(String msg, Exception cause) { 563 super(msg, cause); 564 } 565 } 566 567 /** 568 * Default constructor. <strong>Every</strong> fragment must have an 569 * empty constructor, so it can be instantiated when restoring its 570 * activity's state. It is strongly recommended that subclasses do not 571 * have other constructors with parameters, since these constructors 572 * will not be called when the fragment is re-instantiated; instead, 573 * arguments can be supplied by the caller with {@link #setArguments} 574 * and later retrieved by the Fragment with {@link #getArguments}. 575 * 576 * <p>Applications should generally not implement a constructor. Prefer 577 * {@link #onAttach(Context)} instead. It is the first place application code can run where 578 * the fragment is ready to be used - the point where the fragment is actually associated with 579 * its context. Some applications may also want to implement {@link #onInflate} to retrieve 580 * attributes from a layout resource, although note this happens when the fragment is attached. 581 */ 582 public Fragment() { 583 } 584 585 /** 586 * Like {@link #instantiate(Context, String, Bundle)} but with a null 587 * argument Bundle. 588 */ 589 public static Fragment instantiate(Context context, String fname) { 590 return instantiate(context, fname, null); 591 } 592 593 /** 594 * Create a new instance of a Fragment with the given class name. This is 595 * the same as calling its empty constructor. 596 * 597 * @param context The calling context being used to instantiate the fragment. 598 * This is currently just used to get its ClassLoader. 599 * @param fname The class name of the fragment to instantiate. 600 * @param args Bundle of arguments to supply to the fragment, which it 601 * can retrieve with {@link #getArguments()}. May be null. 602 * @return Returns a new fragment instance. 603 * @throws InstantiationException If there is a failure in instantiating 604 * the given fragment class. This is a runtime exception; it is not 605 * normally expected to happen. 606 */ 607 public static Fragment instantiate(Context context, String fname, @Nullable Bundle args) { 608 try { 609 Class<?> clazz = sClassMap.get(fname); 610 if (clazz == null) { 611 // Class not found in the cache, see if it's real, and try to add it 612 clazz = context.getClassLoader().loadClass(fname); 613 if (!Fragment.class.isAssignableFrom(clazz)) { 614 throw new InstantiationException("Trying to instantiate a class " + fname 615 + " that is not a Fragment", new ClassCastException()); 616 } 617 sClassMap.put(fname, clazz); 618 } 619 Fragment f = (Fragment)clazz.newInstance(); 620 if (args != null) { 621 args.setClassLoader(f.getClass().getClassLoader()); 622 f.setArguments(args); 623 } 624 return f; 625 } catch (ClassNotFoundException e) { 626 throw new InstantiationException("Unable to instantiate fragment " + fname 627 + ": make sure class name exists, is public, and has an" 628 + " empty constructor that is public", e); 629 } catch (java.lang.InstantiationException e) { 630 throw new InstantiationException("Unable to instantiate fragment " + fname 631 + ": make sure class name exists, is public, and has an" 632 + " empty constructor that is public", e); 633 } catch (IllegalAccessException e) { 634 throw new InstantiationException("Unable to instantiate fragment " + fname 635 + ": make sure class name exists, is public, and has an" 636 + " empty constructor that is public", e); 637 } 638 } 639 640 final void restoreViewState(Bundle savedInstanceState) { 641 if (mSavedViewState != null) { 642 mView.restoreHierarchyState(mSavedViewState); 643 mSavedViewState = null; 644 } 645 mCalled = false; 646 onViewStateRestored(savedInstanceState); 647 if (!mCalled) { 648 throw new SuperNotCalledException("Fragment " + this 649 + " did not call through to super.onViewStateRestored()"); 650 } 651 } 652 653 final void setIndex(int index, Fragment parent) { 654 mIndex = index; 655 if (parent != null) { 656 mWho = parent.mWho + ":" + mIndex; 657 } else { 658 mWho = "android:fragment:" + mIndex; 659 } 660 } 661 662 final boolean isInBackStack() { 663 return mBackStackNesting > 0; 664 } 665 666 /** 667 * Subclasses can not override equals(). 668 */ 669 @Override final public boolean equals(Object o) { 670 return super.equals(o); 671 } 672 673 /** 674 * Subclasses can not override hashCode(). 675 */ 676 @Override final public int hashCode() { 677 return super.hashCode(); 678 } 679 680 @Override 681 public String toString() { 682 StringBuilder sb = new StringBuilder(128); 683 DebugUtils.buildShortClassTag(this, sb); 684 if (mIndex >= 0) { 685 sb.append(" #"); 686 sb.append(mIndex); 687 } 688 if (mFragmentId != 0) { 689 sb.append(" id=0x"); 690 sb.append(Integer.toHexString(mFragmentId)); 691 } 692 if (mTag != null) { 693 sb.append(" "); 694 sb.append(mTag); 695 } 696 sb.append('}'); 697 return sb.toString(); 698 } 699 700 /** 701 * Return the identifier this fragment is known by. This is either 702 * the android:id value supplied in a layout or the container view ID 703 * supplied when adding the fragment. 704 */ 705 final public int getId() { 706 return mFragmentId; 707 } 708 709 /** 710 * Get the tag name of the fragment, if specified. 711 */ 712 final public String getTag() { 713 return mTag; 714 } 715 716 /** 717 * Supply the construction arguments for this fragment. 718 * The arguments supplied here will be retained across fragment destroy and 719 * creation. 720 * 721 * <p>This method cannot be called if the fragment is added to a FragmentManager and 722 * if {@link #isStateSaved()} would return true. Prior to {@link Build.VERSION_CODES#O}, 723 * this method may only be called if the fragment has not yet been added to a FragmentManager. 724 * </p> 725 */ 726 public void setArguments(Bundle args) { 727 // The isStateSaved requirement below was only added in Android O and is compatible 728 // because it loosens previous requirements rather than making them more strict. 729 // See method javadoc. 730 if (mIndex >= 0 && isStateSaved()) { 731 throw new IllegalStateException("Fragment already active"); 732 } 733 mArguments = args; 734 } 735 736 /** 737 * Return the arguments supplied to {@link #setArguments}, if any. 738 */ 739 final public Bundle getArguments() { 740 return mArguments; 741 } 742 743 /** 744 * Returns true if this fragment is added and its state has already been saved 745 * by its host. Any operations that would change saved state should not be performed 746 * if this method returns true, and some operations such as {@link #setArguments(Bundle)} 747 * will fail. 748 * 749 * @return true if this fragment's state has already been saved by its host 750 */ 751 public final boolean isStateSaved() { 752 if (mFragmentManager == null) { 753 return false; 754 } 755 return mFragmentManager.isStateSaved(); 756 } 757 758 /** 759 * Set the initial saved state that this Fragment should restore itself 760 * from when first being constructed, as returned by 761 * {@link FragmentManager#saveFragmentInstanceState(Fragment) 762 * FragmentManager.saveFragmentInstanceState}. 763 * 764 * @param state The state the fragment should be restored from. 765 */ 766 public void setInitialSavedState(SavedState state) { 767 if (mIndex >= 0) { 768 throw new IllegalStateException("Fragment already active"); 769 } 770 mSavedFragmentState = state != null && state.mState != null 771 ? state.mState : null; 772 } 773 774 /** 775 * Optional target for this fragment. This may be used, for example, 776 * if this fragment is being started by another, and when done wants to 777 * give a result back to the first. The target set here is retained 778 * across instances via {@link FragmentManager#putFragment 779 * FragmentManager.putFragment()}. 780 * 781 * @param fragment The fragment that is the target of this one. 782 * @param requestCode Optional request code, for convenience if you 783 * are going to call back with {@link #onActivityResult(int, int, Intent)}. 784 */ 785 public void setTargetFragment(Fragment fragment, int requestCode) { 786 // Don't allow a caller to set a target fragment in another FragmentManager, 787 // but there's a snag: people do set target fragments before fragments get added. 788 // We'll have the FragmentManager check that for validity when we move 789 // the fragments to a valid state. 790 final FragmentManager mine = getFragmentManager(); 791 final FragmentManager theirs = fragment.getFragmentManager(); 792 if (mine != null && theirs != null && mine != theirs) { 793 throw new IllegalArgumentException("Fragment " + fragment 794 + " must share the same FragmentManager to be set as a target fragment"); 795 } 796 797 // Don't let someone create a cycle. 798 for (Fragment check = fragment; check != null; check = check.getTargetFragment()) { 799 if (check == this) { 800 throw new IllegalArgumentException("Setting " + fragment + " as the target of " 801 + this + " would create a target cycle"); 802 } 803 } 804 mTarget = fragment; 805 mTargetRequestCode = requestCode; 806 } 807 808 /** 809 * Return the target fragment set by {@link #setTargetFragment}. 810 */ 811 final public Fragment getTargetFragment() { 812 return mTarget; 813 } 814 815 /** 816 * Return the target request code set by {@link #setTargetFragment}. 817 */ 818 final public int getTargetRequestCode() { 819 return mTargetRequestCode; 820 } 821 822 /** 823 * Return the {@link Context} this fragment is currently associated with. 824 */ 825 public Context getContext() { 826 return mHost == null ? null : mHost.getContext(); 827 } 828 829 /** 830 * Return the Activity this fragment is currently associated with. 831 */ 832 final public Activity getActivity() { 833 return mHost == null ? null : mHost.getActivity(); 834 } 835 836 /** 837 * Return the host object of this fragment. May return {@code null} if the fragment 838 * isn't currently being hosted. 839 */ 840 @Nullable 841 final public Object getHost() { 842 return mHost == null ? null : mHost.onGetHost(); 843 } 844 845 /** 846 * Return <code>getActivity().getResources()</code>. 847 */ 848 final public Resources getResources() { 849 if (mHost == null) { 850 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 851 } 852 return mHost.getContext().getResources(); 853 } 854 855 /** 856 * Return a localized, styled CharSequence from the application's package's 857 * default string table. 858 * 859 * @param resId Resource id for the CharSequence text 860 */ 861 public final CharSequence getText(@StringRes int resId) { 862 return getResources().getText(resId); 863 } 864 865 /** 866 * Return a localized string from the application's package's 867 * default string table. 868 * 869 * @param resId Resource id for the string 870 */ 871 public final String getString(@StringRes int resId) { 872 return getResources().getString(resId); 873 } 874 875 /** 876 * Return a localized formatted string from the application's package's 877 * default string table, substituting the format arguments as defined in 878 * {@link java.util.Formatter} and {@link java.lang.String#format}. 879 * 880 * @param resId Resource id for the format string 881 * @param formatArgs The format arguments that will be used for substitution. 882 */ 883 884 public final String getString(@StringRes int resId, Object... formatArgs) { 885 return getResources().getString(resId, formatArgs); 886 } 887 888 /** 889 * Return the FragmentManager for interacting with fragments associated 890 * with this fragment's activity. Note that this will be non-null slightly 891 * before {@link #getActivity()}, during the time from when the fragment is 892 * placed in a {@link FragmentTransaction} until it is committed and 893 * attached to its activity. 894 * 895 * <p>If this Fragment is a child of another Fragment, the FragmentManager 896 * returned here will be the parent's {@link #getChildFragmentManager()}. 897 */ 898 final public FragmentManager getFragmentManager() { 899 return mFragmentManager; 900 } 901 902 /** 903 * Return a private FragmentManager for placing and managing Fragments 904 * inside of this Fragment. 905 */ 906 final public FragmentManager getChildFragmentManager() { 907 if (mChildFragmentManager == null) { 908 instantiateChildFragmentManager(); 909 if (mState >= RESUMED) { 910 mChildFragmentManager.dispatchResume(); 911 } else if (mState >= STARTED) { 912 mChildFragmentManager.dispatchStart(); 913 } else if (mState >= ACTIVITY_CREATED) { 914 mChildFragmentManager.dispatchActivityCreated(); 915 } else if (mState >= CREATED) { 916 mChildFragmentManager.dispatchCreate(); 917 } 918 } 919 return mChildFragmentManager; 920 } 921 922 /** 923 * Returns the parent Fragment containing this Fragment. If this Fragment 924 * is attached directly to an Activity, returns null. 925 */ 926 final public Fragment getParentFragment() { 927 return mParentFragment; 928 } 929 930 /** 931 * Return true if the fragment is currently added to its activity. 932 */ 933 final public boolean isAdded() { 934 return mHost != null && mAdded; 935 } 936 937 /** 938 * Return true if the fragment has been explicitly detached from the UI. 939 * That is, {@link FragmentTransaction#detach(Fragment) 940 * FragmentTransaction.detach(Fragment)} has been used on it. 941 */ 942 final public boolean isDetached() { 943 return mDetached; 944 } 945 946 /** 947 * Return true if this fragment is currently being removed from its 948 * activity. This is <em>not</em> whether its activity is finishing, but 949 * rather whether it is in the process of being removed from its activity. 950 */ 951 final public boolean isRemoving() { 952 return mRemoving; 953 } 954 955 /** 956 * Return true if the layout is included as part of an activity view 957 * hierarchy via the <fragment> tag. This will always be true when 958 * fragments are created through the <fragment> tag, <em>except</em> 959 * in the case where an old fragment is restored from a previous state and 960 * it does not appear in the layout of the current state. 961 */ 962 final public boolean isInLayout() { 963 return mInLayout; 964 } 965 966 /** 967 * Return true if the fragment is in the resumed state. This is true 968 * for the duration of {@link #onResume()} and {@link #onPause()} as well. 969 */ 970 final public boolean isResumed() { 971 return mState >= RESUMED; 972 } 973 974 /** 975 * Return true if the fragment is currently visible to the user. This means 976 * it: (1) has been added, (2) has its view attached to the window, and 977 * (3) is not hidden. 978 */ 979 final public boolean isVisible() { 980 return isAdded() && !isHidden() && mView != null 981 && mView.getWindowToken() != null && mView.getVisibility() == View.VISIBLE; 982 } 983 984 /** 985 * Return true if the fragment has been hidden. By default fragments 986 * are shown. You can find out about changes to this state with 987 * {@link #onHiddenChanged}. Note that the hidden state is orthogonal 988 * to other states -- that is, to be visible to the user, a fragment 989 * must be both started and not hidden. 990 */ 991 final public boolean isHidden() { 992 return mHidden; 993 } 994 995 /** 996 * Called when the hidden state (as returned by {@link #isHidden()} of 997 * the fragment has changed. Fragments start out not hidden; this will 998 * be called whenever the fragment changes state from that. 999 * @param hidden True if the fragment is now hidden, false otherwise. 1000 */ 1001 public void onHiddenChanged(boolean hidden) { 1002 } 1003 1004 /** 1005 * Control whether a fragment instance is retained across Activity 1006 * re-creation (such as from a configuration change). This can only 1007 * be used with fragments not in the back stack. If set, the fragment 1008 * lifecycle will be slightly different when an activity is recreated: 1009 * <ul> 1010 * <li> {@link #onDestroy()} will not be called (but {@link #onDetach()} still 1011 * will be, because the fragment is being detached from its current activity). 1012 * <li> {@link #onCreate(Bundle)} will not be called since the fragment 1013 * is not being re-created. 1014 * <li> {@link #onAttach(Activity)} and {@link #onActivityCreated(Bundle)} <b>will</b> 1015 * still be called. 1016 * </ul> 1017 */ 1018 public void setRetainInstance(boolean retain) { 1019 mRetainInstance = retain; 1020 } 1021 1022 final public boolean getRetainInstance() { 1023 return mRetainInstance; 1024 } 1025 1026 /** 1027 * Report that this fragment would like to participate in populating 1028 * the options menu by receiving a call to {@link #onCreateOptionsMenu} 1029 * and related methods. 1030 * 1031 * @param hasMenu If true, the fragment has menu items to contribute. 1032 */ 1033 public void setHasOptionsMenu(boolean hasMenu) { 1034 if (mHasMenu != hasMenu) { 1035 mHasMenu = hasMenu; 1036 if (isAdded() && !isHidden()) { 1037 mFragmentManager.invalidateOptionsMenu(); 1038 } 1039 } 1040 } 1041 1042 /** 1043 * Set a hint for whether this fragment's menu should be visible. This 1044 * is useful if you know that a fragment has been placed in your view 1045 * hierarchy so that the user can not currently seen it, so any menu items 1046 * it has should also not be shown. 1047 * 1048 * @param menuVisible The default is true, meaning the fragment's menu will 1049 * be shown as usual. If false, the user will not see the menu. 1050 */ 1051 public void setMenuVisibility(boolean menuVisible) { 1052 if (mMenuVisible != menuVisible) { 1053 mMenuVisible = menuVisible; 1054 if (mHasMenu && isAdded() && !isHidden()) { 1055 mFragmentManager.invalidateOptionsMenu(); 1056 } 1057 } 1058 } 1059 1060 /** 1061 * Set a hint to the system about whether this fragment's UI is currently visible 1062 * to the user. This hint defaults to true and is persistent across fragment instance 1063 * state save and restore. 1064 * 1065 * <p>An app may set this to false to indicate that the fragment's UI is 1066 * scrolled out of visibility or is otherwise not directly visible to the user. 1067 * This may be used by the system to prioritize operations such as fragment lifecycle updates 1068 * or loader ordering behavior.</p> 1069 * 1070 * <p><strong>Note:</strong> This method may be called outside of the fragment lifecycle 1071 * and thus has no ordering guarantees with regard to fragment lifecycle method calls.</p> 1072 * 1073 * <p><strong>Note:</strong> Prior to Android N there was a platform bug that could cause 1074 * <code>setUserVisibleHint</code> to bring a fragment up to the started state before its 1075 * <code>FragmentTransaction</code> had been committed. As some apps relied on this behavior, 1076 * it is preserved for apps that declare a <code>targetSdkVersion</code> of 23 or lower.</p> 1077 * 1078 * @param isVisibleToUser true if this fragment's UI is currently visible to the user (default), 1079 * false if it is not. 1080 */ 1081 public void setUserVisibleHint(boolean isVisibleToUser) { 1082 // Prior to Android N we were simply checking if this fragment had a FragmentManager 1083 // set before we would trigger a deferred start. Unfortunately this also gets set before 1084 // a fragment transaction is committed, so if setUserVisibleHint was called before a 1085 // transaction commit, we would start the fragment way too early. FragmentPagerAdapter 1086 // triggers this situation. 1087 // Unfortunately some apps relied on this timing in overrides of setUserVisibleHint 1088 // on their own fragments, and expected, however erroneously, that after a call to 1089 // super.setUserVisibleHint their onStart methods had been run. 1090 // We preserve this behavior for apps targeting old platform versions below. 1091 boolean useBrokenAddedCheck = false; 1092 Context context = getContext(); 1093 if (mFragmentManager != null && mFragmentManager.mHost != null) { 1094 context = mFragmentManager.mHost.getContext(); 1095 } 1096 if (context != null) { 1097 useBrokenAddedCheck = context.getApplicationInfo().targetSdkVersion <= VERSION_CODES.M; 1098 } 1099 1100 final boolean performDeferredStart; 1101 if (useBrokenAddedCheck) { 1102 performDeferredStart = !mUserVisibleHint && isVisibleToUser && mState < STARTED 1103 && mFragmentManager != null; 1104 } else { 1105 performDeferredStart = !mUserVisibleHint && isVisibleToUser && mState < STARTED 1106 && mFragmentManager != null && isAdded(); 1107 } 1108 1109 if (performDeferredStart) { 1110 mFragmentManager.performPendingDeferredStart(this); 1111 } 1112 1113 mUserVisibleHint = isVisibleToUser; 1114 mDeferStart = mState < STARTED && !isVisibleToUser; 1115 } 1116 1117 /** 1118 * @return The current value of the user-visible hint on this fragment. 1119 * @see #setUserVisibleHint(boolean) 1120 */ 1121 public boolean getUserVisibleHint() { 1122 return mUserVisibleHint; 1123 } 1124 1125 /** 1126 * Return the LoaderManager for this fragment, creating it if needed. 1127 */ 1128 public LoaderManager getLoaderManager() { 1129 if (mLoaderManager != null) { 1130 return mLoaderManager; 1131 } 1132 if (mHost == null) { 1133 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 1134 } 1135 mCheckedForLoaderManager = true; 1136 mLoaderManager = mHost.getLoaderManager(mWho, mLoadersStarted, true); 1137 return mLoaderManager; 1138 } 1139 1140 /** 1141 * Call {@link Activity#startActivity(Intent)} from the fragment's 1142 * containing Activity. 1143 * 1144 * @param intent The intent to start. 1145 */ 1146 public void startActivity(Intent intent) { 1147 startActivity(intent, null); 1148 } 1149 1150 /** 1151 * Call {@link Activity#startActivity(Intent, Bundle)} from the fragment's 1152 * containing Activity. 1153 * 1154 * @param intent The intent to start. 1155 * @param options Additional options for how the Activity should be started. 1156 * See {@link android.content.Context#startActivity(Intent, Bundle)} 1157 * Context.startActivity(Intent, Bundle)} for more details. 1158 */ 1159 public void startActivity(Intent intent, Bundle options) { 1160 if (mHost == null) { 1161 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 1162 } 1163 if (options != null) { 1164 mHost.onStartActivityFromFragment(this, intent, -1, options); 1165 } else { 1166 // Note we want to go through this call for compatibility with 1167 // applications that may have overridden the method. 1168 mHost.onStartActivityFromFragment(this, intent, -1, null /*options*/); 1169 } 1170 } 1171 1172 /** 1173 * Call {@link Activity#startActivityForResult(Intent, int)} from the fragment's 1174 * containing Activity. 1175 */ 1176 public void startActivityForResult(Intent intent, int requestCode) { 1177 startActivityForResult(intent, requestCode, null); 1178 } 1179 1180 /** 1181 * Call {@link Activity#startActivityForResult(Intent, int, Bundle)} from the fragment's 1182 * containing Activity. 1183 */ 1184 public void startActivityForResult(Intent intent, int requestCode, Bundle options) { 1185 if (mHost == null) { 1186 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 1187 } 1188 mHost.onStartActivityFromFragment(this, intent, requestCode, options); 1189 } 1190 1191 /** 1192 * Call {@link Activity#startIntentSenderForResult(IntentSender, int, Intent, int, int, int, 1193 * Bundle)} from the fragment's containing Activity. 1194 */ 1195 public void startIntentSenderForResult(IntentSender intent, int requestCode, 1196 @Nullable Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags, 1197 Bundle options) throws IntentSender.SendIntentException { 1198 if (mHost == null) { 1199 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 1200 } 1201 mHost.onStartIntentSenderFromFragment(this, intent, requestCode, fillInIntent, flagsMask, 1202 flagsValues, extraFlags, options); 1203 } 1204 1205 /** 1206 * Receive the result from a previous call to 1207 * {@link #startActivityForResult(Intent, int)}. This follows the 1208 * related Activity API as described there in 1209 * {@link Activity#onActivityResult(int, int, Intent)}. 1210 * 1211 * @param requestCode The integer request code originally supplied to 1212 * startActivityForResult(), allowing you to identify who this 1213 * result came from. 1214 * @param resultCode The integer result code returned by the child activity 1215 * through its setResult(). 1216 * @param data An Intent, which can return result data to the caller 1217 * (various data can be attached to Intent "extras"). 1218 */ 1219 public void onActivityResult(int requestCode, int resultCode, Intent data) { 1220 } 1221 1222 /** 1223 * Requests permissions to be granted to this application. These permissions 1224 * must be requested in your manifest, they should not be granted to your app, 1225 * and they should have protection level {@link android.content.pm.PermissionInfo 1226 * #PROTECTION_DANGEROUS dangerous}, regardless whether they are declared by 1227 * the platform or a third-party app. 1228 * <p> 1229 * Normal permissions {@link android.content.pm.PermissionInfo#PROTECTION_NORMAL} 1230 * are granted at install time if requested in the manifest. Signature permissions 1231 * {@link android.content.pm.PermissionInfo#PROTECTION_SIGNATURE} are granted at 1232 * install time if requested in the manifest and the signature of your app matches 1233 * the signature of the app declaring the permissions. 1234 * </p> 1235 * <p> 1236 * If your app does not have the requested permissions the user will be presented 1237 * with UI for accepting them. After the user has accepted or rejected the 1238 * requested permissions you will receive a callback on {@link 1239 * #onRequestPermissionsResult(int, String[], int[])} reporting whether the 1240 * permissions were granted or not. 1241 * </p> 1242 * <p> 1243 * Note that requesting a permission does not guarantee it will be granted and 1244 * your app should be able to run without having this permission. 1245 * </p> 1246 * <p> 1247 * This method may start an activity allowing the user to choose which permissions 1248 * to grant and which to reject. Hence, you should be prepared that your activity 1249 * may be paused and resumed. Further, granting some permissions may require 1250 * a restart of you application. In such a case, the system will recreate the 1251 * activity stack before delivering the result to {@link 1252 * #onRequestPermissionsResult(int, String[], int[])}. 1253 * </p> 1254 * <p> 1255 * When checking whether you have a permission you should use {@link 1256 * android.content.Context#checkSelfPermission(String)}. 1257 * </p> 1258 * <p> 1259 * Calling this API for permissions already granted to your app would show UI 1260 * to the user to decide whether the app can still hold these permissions. This 1261 * can be useful if the way your app uses data guarded by the permissions 1262 * changes significantly. 1263 * </p> 1264 * <p> 1265 * You cannot request a permission if your activity sets {@link 1266 * android.R.styleable#AndroidManifestActivity_noHistory noHistory} to 1267 * <code>true</code> because in this case the activity would not receive 1268 * result callbacks including {@link #onRequestPermissionsResult(int, String[], int[])}. 1269 * </p> 1270 * <p> 1271 * A sample permissions request looks like this: 1272 * </p> 1273 * <code><pre><p> 1274 * private void showContacts() { 1275 * if (getActivity().checkSelfPermission(Manifest.permission.READ_CONTACTS) 1276 * != PackageManager.PERMISSION_GRANTED) { 1277 * requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, 1278 * PERMISSIONS_REQUEST_READ_CONTACTS); 1279 * } else { 1280 * doShowContacts(); 1281 * } 1282 * } 1283 * 1284 * {@literal @}Override 1285 * public void onRequestPermissionsResult(int requestCode, String[] permissions, 1286 * int[] grantResults) { 1287 * if (requestCode == PERMISSIONS_REQUEST_READ_CONTACTS 1288 * && grantResults[0] == PackageManager.PERMISSION_GRANTED) { 1289 * doShowContacts(); 1290 * } 1291 * } 1292 * </code></pre></p> 1293 * 1294 * @param permissions The requested permissions. Must me non-null and not empty. 1295 * @param requestCode Application specific request code to match with a result 1296 * reported to {@link #onRequestPermissionsResult(int, String[], int[])}. 1297 * Should be >= 0. 1298 * 1299 * @see #onRequestPermissionsResult(int, String[], int[]) 1300 * @see android.content.Context#checkSelfPermission(String) 1301 */ 1302 public final void requestPermissions(@NonNull String[] permissions, int requestCode) { 1303 if (mHost == null) { 1304 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 1305 } 1306 mHost.onRequestPermissionsFromFragment(this, permissions,requestCode); 1307 } 1308 1309 /** 1310 * Callback for the result from requesting permissions. This method 1311 * is invoked for every call on {@link #requestPermissions(String[], int)}. 1312 * <p> 1313 * <strong>Note:</strong> It is possible that the permissions request interaction 1314 * with the user is interrupted. In this case you will receive empty permissions 1315 * and results arrays which should be treated as a cancellation. 1316 * </p> 1317 * 1318 * @param requestCode The request code passed in {@link #requestPermissions(String[], int)}. 1319 * @param permissions The requested permissions. Never null. 1320 * @param grantResults The grant results for the corresponding permissions 1321 * which is either {@link android.content.pm.PackageManager#PERMISSION_GRANTED} 1322 * or {@link android.content.pm.PackageManager#PERMISSION_DENIED}. Never null. 1323 * 1324 * @see #requestPermissions(String[], int) 1325 */ 1326 public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, 1327 @NonNull int[] grantResults) { 1328 /* callback - do nothing */ 1329 } 1330 1331 /** 1332 * Gets whether you should show UI with rationale for requesting a permission. 1333 * You should do this only if you do not have the permission and the context in 1334 * which the permission is requested does not clearly communicate to the user 1335 * what would be the benefit from granting this permission. 1336 * <p> 1337 * For example, if you write a camera app, requesting the camera permission 1338 * would be expected by the user and no rationale for why it is requested is 1339 * needed. If however, the app needs location for tagging photos then a non-tech 1340 * savvy user may wonder how location is related to taking photos. In this case 1341 * you may choose to show UI with rationale of requesting this permission. 1342 * </p> 1343 * 1344 * @param permission A permission your app wants to request. 1345 * @return Whether you can show permission rationale UI. 1346 * 1347 * @see Context#checkSelfPermission(String) 1348 * @see #requestPermissions(String[], int) 1349 * @see #onRequestPermissionsResult(int, String[], int[]) 1350 */ 1351 public boolean shouldShowRequestPermissionRationale(@NonNull String permission) { 1352 if (mHost != null) { 1353 return mHost.getContext().getPackageManager() 1354 .shouldShowRequestPermissionRationale(permission); 1355 } 1356 return false; 1357 } 1358 1359 /** 1360 * @hide Hack so that DialogFragment can make its Dialog before creating 1361 * its views, and the view construction can use the dialog's context for 1362 * inflation. Maybe this should become a public API. Note sure. 1363 */ 1364 public LayoutInflater getLayoutInflater(Bundle savedInstanceState) { 1365 final LayoutInflater result = mHost.onGetLayoutInflater(); 1366 if (mHost.onUseFragmentManagerInflaterFactory()) { 1367 getChildFragmentManager(); // Init if needed; use raw implementation below. 1368 result.setPrivateFactory(mChildFragmentManager.getLayoutInflaterFactory()); 1369 } 1370 return result; 1371 } 1372 1373 /** 1374 * @deprecated Use {@link #onInflate(Context, AttributeSet, Bundle)} instead. 1375 */ 1376 @Deprecated 1377 @CallSuper 1378 public void onInflate(AttributeSet attrs, Bundle savedInstanceState) { 1379 mCalled = true; 1380 } 1381 1382 /** 1383 * Called when a fragment is being created as part of a view layout 1384 * inflation, typically from setting the content view of an activity. This 1385 * may be called immediately after the fragment is created from a <fragment> 1386 * tag in a layout file. Note this is <em>before</em> the fragment's 1387 * {@link #onAttach(Activity)} has been called; all you should do here is 1388 * parse the attributes and save them away. 1389 * 1390 * <p>This is called every time the fragment is inflated, even if it is 1391 * being inflated into a new instance with saved state. It typically makes 1392 * sense to re-parse the parameters each time, to allow them to change with 1393 * different configurations.</p> 1394 * 1395 * <p>Here is a typical implementation of a fragment that can take parameters 1396 * both through attributes supplied here as well from {@link #getArguments()}:</p> 1397 * 1398 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentArguments.java 1399 * fragment} 1400 * 1401 * <p>Note that parsing the XML attributes uses a "styleable" resource. The 1402 * declaration for the styleable used here is:</p> 1403 * 1404 * {@sample development/samples/ApiDemos/res/values/attrs.xml fragment_arguments} 1405 * 1406 * <p>The fragment can then be declared within its activity's content layout 1407 * through a tag like this:</p> 1408 * 1409 * {@sample development/samples/ApiDemos/res/layout/fragment_arguments.xml from_attributes} 1410 * 1411 * <p>This fragment can also be created dynamically from arguments given 1412 * at runtime in the arguments Bundle; here is an example of doing so at 1413 * creation of the containing activity:</p> 1414 * 1415 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentArguments.java 1416 * create} 1417 * 1418 * @param context The Context that is inflating this fragment. 1419 * @param attrs The attributes at the tag where the fragment is 1420 * being created. 1421 * @param savedInstanceState If the fragment is being re-created from 1422 * a previous saved state, this is the state. 1423 */ 1424 @CallSuper 1425 public void onInflate(Context context, AttributeSet attrs, Bundle savedInstanceState) { 1426 onInflate(attrs, savedInstanceState); 1427 mCalled = true; 1428 1429 TypedArray a = context.obtainStyledAttributes(attrs, 1430 com.android.internal.R.styleable.Fragment); 1431 setEnterTransition(loadTransition(context, a, getEnterTransition(), null, 1432 com.android.internal.R.styleable.Fragment_fragmentEnterTransition)); 1433 setReturnTransition(loadTransition(context, a, getReturnTransition(), 1434 USE_DEFAULT_TRANSITION, 1435 com.android.internal.R.styleable.Fragment_fragmentReturnTransition)); 1436 setExitTransition(loadTransition(context, a, getExitTransition(), null, 1437 com.android.internal.R.styleable.Fragment_fragmentExitTransition)); 1438 1439 setReenterTransition(loadTransition(context, a, getReenterTransition(), 1440 USE_DEFAULT_TRANSITION, 1441 com.android.internal.R.styleable.Fragment_fragmentReenterTransition)); 1442 setSharedElementEnterTransition(loadTransition(context, a, 1443 getSharedElementEnterTransition(), null, 1444 com.android.internal.R.styleable.Fragment_fragmentSharedElementEnterTransition)); 1445 setSharedElementReturnTransition(loadTransition(context, a, 1446 getSharedElementReturnTransition(), USE_DEFAULT_TRANSITION, 1447 com.android.internal.R.styleable.Fragment_fragmentSharedElementReturnTransition)); 1448 boolean isEnterSet; 1449 boolean isReturnSet; 1450 if (mAnimationInfo == null) { 1451 isEnterSet = false; 1452 isReturnSet = false; 1453 } else { 1454 isEnterSet = mAnimationInfo.mAllowEnterTransitionOverlap != null; 1455 isReturnSet = mAnimationInfo.mAllowReturnTransitionOverlap != null; 1456 } 1457 if (!isEnterSet) { 1458 setAllowEnterTransitionOverlap(a.getBoolean( 1459 com.android.internal.R.styleable.Fragment_fragmentAllowEnterTransitionOverlap, 1460 true)); 1461 } 1462 if (!isReturnSet) { 1463 setAllowReturnTransitionOverlap(a.getBoolean( 1464 com.android.internal.R.styleable.Fragment_fragmentAllowReturnTransitionOverlap, 1465 true)); 1466 } 1467 a.recycle(); 1468 1469 final Activity hostActivity = mHost == null ? null : mHost.getActivity(); 1470 if (hostActivity != null) { 1471 mCalled = false; 1472 onInflate(hostActivity, attrs, savedInstanceState); 1473 } 1474 } 1475 1476 /** 1477 * @deprecated Use {@link #onInflate(Context, AttributeSet, Bundle)} instead. 1478 */ 1479 @Deprecated 1480 @CallSuper 1481 public void onInflate(Activity activity, AttributeSet attrs, Bundle savedInstanceState) { 1482 mCalled = true; 1483 } 1484 1485 /** 1486 * Called when a fragment is attached as a child of this fragment. 1487 * 1488 * <p>This is called after the attached fragment's <code>onAttach</code> and before 1489 * the attached fragment's <code>onCreate</code> if the fragment has not yet had a previous 1490 * call to <code>onCreate</code>.</p> 1491 * 1492 * @param childFragment child fragment being attached 1493 */ 1494 public void onAttachFragment(Fragment childFragment) { 1495 } 1496 1497 /** 1498 * Called when a fragment is first attached to its context. 1499 * {@link #onCreate(Bundle)} will be called after this. 1500 */ 1501 @CallSuper 1502 public void onAttach(Context context) { 1503 mCalled = true; 1504 final Activity hostActivity = mHost == null ? null : mHost.getActivity(); 1505 if (hostActivity != null) { 1506 mCalled = false; 1507 onAttach(hostActivity); 1508 } 1509 } 1510 1511 /** 1512 * @deprecated Use {@link #onAttach(Context)} instead. 1513 */ 1514 @Deprecated 1515 @CallSuper 1516 public void onAttach(Activity activity) { 1517 mCalled = true; 1518 } 1519 1520 /** 1521 * Called when a fragment loads an animation. 1522 */ 1523 public Animator onCreateAnimator(int transit, boolean enter, int nextAnim) { 1524 return null; 1525 } 1526 1527 /** 1528 * Called to do initial creation of a fragment. This is called after 1529 * {@link #onAttach(Activity)} and before 1530 * {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}, but is not called if the fragment 1531 * instance is retained across Activity re-creation (see {@link #setRetainInstance(boolean)}). 1532 * 1533 * <p>Note that this can be called while the fragment's activity is 1534 * still in the process of being created. As such, you can not rely 1535 * on things like the activity's content view hierarchy being initialized 1536 * at this point. If you want to do work once the activity itself is 1537 * created, see {@link #onActivityCreated(Bundle)}. 1538 * 1539 * <p>If your app's <code>targetSdkVersion</code> is {@link android.os.Build.VERSION_CODES#M} 1540 * or lower, child fragments being restored from the savedInstanceState are restored after 1541 * <code>onCreate</code> returns. When targeting {@link android.os.Build.VERSION_CODES#N} or 1542 * above and running on an N or newer platform version 1543 * they are restored by <code>Fragment.onCreate</code>.</p> 1544 * 1545 * @param savedInstanceState If the fragment is being re-created from 1546 * a previous saved state, this is the state. 1547 */ 1548 @CallSuper 1549 public void onCreate(@Nullable Bundle savedInstanceState) { 1550 mCalled = true; 1551 final Context context = getContext(); 1552 final int version = context != null ? context.getApplicationInfo().targetSdkVersion : 0; 1553 if (version >= Build.VERSION_CODES.N) { 1554 restoreChildFragmentState(savedInstanceState, true); 1555 if (mChildFragmentManager != null 1556 && !mChildFragmentManager.isStateAtLeast(Fragment.CREATED)) { 1557 mChildFragmentManager.dispatchCreate(); 1558 } 1559 } 1560 } 1561 1562 void restoreChildFragmentState(@Nullable Bundle savedInstanceState, boolean provideNonConfig) { 1563 if (savedInstanceState != null) { 1564 Parcelable p = savedInstanceState.getParcelable(Activity.FRAGMENTS_TAG); 1565 if (p != null) { 1566 if (mChildFragmentManager == null) { 1567 instantiateChildFragmentManager(); 1568 } 1569 mChildFragmentManager.restoreAllState(p, provideNonConfig ? mChildNonConfig : null); 1570 mChildNonConfig = null; 1571 mChildFragmentManager.dispatchCreate(); 1572 } 1573 } 1574 } 1575 1576 /** 1577 * Called to have the fragment instantiate its user interface view. 1578 * This is optional, and non-graphical fragments can return null (which 1579 * is the default implementation). This will be called between 1580 * {@link #onCreate(Bundle)} and {@link #onActivityCreated(Bundle)}. 1581 * 1582 * <p>If you return a View from here, you will later be called in 1583 * {@link #onDestroyView} when the view is being released. 1584 * 1585 * @param inflater The LayoutInflater object that can be used to inflate 1586 * any views in the fragment, 1587 * @param container If non-null, this is the parent view that the fragment's 1588 * UI should be attached to. The fragment should not add the view itself, 1589 * but this can be used to generate the LayoutParams of the view. 1590 * @param savedInstanceState If non-null, this fragment is being re-constructed 1591 * from a previous saved state as given here. 1592 * 1593 * @return Return the View for the fragment's UI, or null. 1594 */ 1595 @Nullable 1596 public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, 1597 Bundle savedInstanceState) { 1598 return null; 1599 } 1600 1601 /** 1602 * Called immediately after {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)} 1603 * has returned, but before any saved state has been restored in to the view. 1604 * This gives subclasses a chance to initialize themselves once 1605 * they know their view hierarchy has been completely created. The fragment's 1606 * view hierarchy is not however attached to its parent at this point. 1607 * @param view The View returned by {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}. 1608 * @param savedInstanceState If non-null, this fragment is being re-constructed 1609 * from a previous saved state as given here. 1610 */ 1611 public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { 1612 } 1613 1614 /** 1615 * Get the root view for the fragment's layout (the one returned by {@link #onCreateView}), 1616 * if provided. 1617 * 1618 * @return The fragment's root view, or null if it has no layout. 1619 */ 1620 @Nullable 1621 public View getView() { 1622 return mView; 1623 } 1624 1625 /** 1626 * Called when the fragment's activity has been created and this 1627 * fragment's view hierarchy instantiated. It can be used to do final 1628 * initialization once these pieces are in place, such as retrieving 1629 * views or restoring state. It is also useful for fragments that use 1630 * {@link #setRetainInstance(boolean)} to retain their instance, 1631 * as this callback tells the fragment when it is fully associated with 1632 * the new activity instance. This is called after {@link #onCreateView} 1633 * and before {@link #onViewStateRestored(Bundle)}. 1634 * 1635 * @param savedInstanceState If the fragment is being re-created from 1636 * a previous saved state, this is the state. 1637 */ 1638 @CallSuper 1639 public void onActivityCreated(@Nullable Bundle savedInstanceState) { 1640 mCalled = true; 1641 } 1642 1643 /** 1644 * Called when all saved state has been restored into the view hierarchy 1645 * of the fragment. This can be used to do initialization based on saved 1646 * state that you are letting the view hierarchy track itself, such as 1647 * whether check box widgets are currently checked. This is called 1648 * after {@link #onActivityCreated(Bundle)} and before 1649 * {@link #onStart()}. 1650 * 1651 * @param savedInstanceState If the fragment is being re-created from 1652 * a previous saved state, this is the state. 1653 */ 1654 @CallSuper 1655 public void onViewStateRestored(Bundle savedInstanceState) { 1656 mCalled = true; 1657 } 1658 1659 /** 1660 * Called when the Fragment is visible to the user. This is generally 1661 * tied to {@link Activity#onStart() Activity.onStart} of the containing 1662 * Activity's lifecycle. 1663 */ 1664 @CallSuper 1665 public void onStart() { 1666 mCalled = true; 1667 1668 if (!mLoadersStarted) { 1669 mLoadersStarted = true; 1670 if (!mCheckedForLoaderManager) { 1671 mCheckedForLoaderManager = true; 1672 mLoaderManager = mHost.getLoaderManager(mWho, mLoadersStarted, false); 1673 } 1674 if (mLoaderManager != null) { 1675 mLoaderManager.doStart(); 1676 } 1677 } 1678 } 1679 1680 /** 1681 * Called when the fragment is visible to the user and actively running. 1682 * This is generally 1683 * tied to {@link Activity#onResume() Activity.onResume} of the containing 1684 * Activity's lifecycle. 1685 */ 1686 @CallSuper 1687 public void onResume() { 1688 mCalled = true; 1689 } 1690 1691 /** 1692 * Called to ask the fragment to save its current dynamic state, so it 1693 * can later be reconstructed in a new instance of its process is 1694 * restarted. If a new instance of the fragment later needs to be 1695 * created, the data you place in the Bundle here will be available 1696 * in the Bundle given to {@link #onCreate(Bundle)}, 1697 * {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}, and 1698 * {@link #onActivityCreated(Bundle)}. 1699 * 1700 * <p>This corresponds to {@link Activity#onSaveInstanceState(Bundle) 1701 * Activity.onSaveInstanceState(Bundle)} and most of the discussion there 1702 * applies here as well. Note however: <em>this method may be called 1703 * at any time before {@link #onDestroy()}</em>. There are many situations 1704 * where a fragment may be mostly torn down (such as when placed on the 1705 * back stack with no UI showing), but its state will not be saved until 1706 * its owning activity actually needs to save its state. 1707 * 1708 * @param outState Bundle in which to place your saved state. 1709 */ 1710 public void onSaveInstanceState(Bundle outState) { 1711 } 1712 1713 /** 1714 * Called when the Fragment's activity changes from fullscreen mode to multi-window mode and 1715 * visa-versa. This is generally tied to {@link Activity#onMultiWindowModeChanged} of the 1716 * containing Activity. 1717 * 1718 * @param isInMultiWindowMode True if the activity is in multi-window mode. 1719 */ 1720 public void onMultiWindowModeChanged(boolean isInMultiWindowMode) { 1721 } 1722 1723 /** 1724 * Called by the system when the activity changes to and from picture-in-picture mode. This is 1725 * generally tied to {@link Activity#onPictureInPictureModeChanged} of the containing Activity. 1726 * 1727 * @param isInPictureInPictureMode True if the activity is in picture-in-picture mode. 1728 */ 1729 public void onPictureInPictureModeChanged(boolean isInPictureInPictureMode) { 1730 } 1731 1732 @CallSuper 1733 public void onConfigurationChanged(Configuration newConfig) { 1734 mCalled = true; 1735 } 1736 1737 /** 1738 * Called when the Fragment is no longer resumed. This is generally 1739 * tied to {@link Activity#onPause() Activity.onPause} of the containing 1740 * Activity's lifecycle. 1741 */ 1742 @CallSuper 1743 public void onPause() { 1744 mCalled = true; 1745 } 1746 1747 /** 1748 * Called when the Fragment is no longer started. This is generally 1749 * tied to {@link Activity#onStop() Activity.onStop} of the containing 1750 * Activity's lifecycle. 1751 */ 1752 @CallSuper 1753 public void onStop() { 1754 mCalled = true; 1755 } 1756 1757 @CallSuper 1758 public void onLowMemory() { 1759 mCalled = true; 1760 } 1761 1762 @CallSuper 1763 public void onTrimMemory(int level) { 1764 mCalled = true; 1765 } 1766 1767 /** 1768 * Called when the view previously created by {@link #onCreateView} has 1769 * been detached from the fragment. The next time the fragment needs 1770 * to be displayed, a new view will be created. This is called 1771 * after {@link #onStop()} and before {@link #onDestroy()}. It is called 1772 * <em>regardless</em> of whether {@link #onCreateView} returned a 1773 * non-null view. Internally it is called after the view's state has 1774 * been saved but before it has been removed from its parent. 1775 */ 1776 @CallSuper 1777 public void onDestroyView() { 1778 mCalled = true; 1779 } 1780 1781 /** 1782 * Called when the fragment is no longer in use. This is called 1783 * after {@link #onStop()} and before {@link #onDetach()}. 1784 */ 1785 @CallSuper 1786 public void onDestroy() { 1787 mCalled = true; 1788 //Log.v("foo", "onDestroy: mCheckedForLoaderManager=" + mCheckedForLoaderManager 1789 // + " mLoaderManager=" + mLoaderManager); 1790 if (!mCheckedForLoaderManager) { 1791 mCheckedForLoaderManager = true; 1792 mLoaderManager = mHost.getLoaderManager(mWho, mLoadersStarted, false); 1793 } 1794 if (mLoaderManager != null) { 1795 mLoaderManager.doDestroy(); 1796 } 1797 } 1798 1799 /** 1800 * Called by the fragment manager once this fragment has been removed, 1801 * so that we don't have any left-over state if the application decides 1802 * to re-use the instance. This only clears state that the framework 1803 * internally manages, not things the application sets. 1804 */ 1805 void initState() { 1806 mIndex = -1; 1807 mWho = null; 1808 mAdded = false; 1809 mRemoving = false; 1810 mFromLayout = false; 1811 mInLayout = false; 1812 mRestored = false; 1813 mBackStackNesting = 0; 1814 mFragmentManager = null; 1815 mChildFragmentManager = null; 1816 mHost = null; 1817 mFragmentId = 0; 1818 mContainerId = 0; 1819 mTag = null; 1820 mHidden = false; 1821 mDetached = false; 1822 mRetaining = false; 1823 mLoaderManager = null; 1824 mLoadersStarted = false; 1825 mCheckedForLoaderManager = false; 1826 } 1827 1828 /** 1829 * Called when the fragment is no longer attached to its activity. This is called after 1830 * {@link #onDestroy()}, except in the cases where the fragment instance is retained across 1831 * Activity re-creation (see {@link #setRetainInstance(boolean)}), in which case it is called 1832 * after {@link #onStop()}. 1833 */ 1834 @CallSuper 1835 public void onDetach() { 1836 mCalled = true; 1837 } 1838 1839 /** 1840 * Initialize the contents of the Activity's standard options menu. You 1841 * should place your menu items in to <var>menu</var>. For this method 1842 * to be called, you must have first called {@link #setHasOptionsMenu}. See 1843 * {@link Activity#onCreateOptionsMenu(Menu) Activity.onCreateOptionsMenu} 1844 * for more information. 1845 * 1846 * @param menu The options menu in which you place your items. 1847 * 1848 * @see #setHasOptionsMenu 1849 * @see #onPrepareOptionsMenu 1850 * @see #onOptionsItemSelected 1851 */ 1852 public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 1853 } 1854 1855 /** 1856 * Prepare the Screen's standard options menu to be displayed. This is 1857 * called right before the menu is shown, every time it is shown. You can 1858 * use this method to efficiently enable/disable items or otherwise 1859 * dynamically modify the contents. See 1860 * {@link Activity#onPrepareOptionsMenu(Menu) Activity.onPrepareOptionsMenu} 1861 * for more information. 1862 * 1863 * @param menu The options menu as last shown or first initialized by 1864 * onCreateOptionsMenu(). 1865 * 1866 * @see #setHasOptionsMenu 1867 * @see #onCreateOptionsMenu 1868 */ 1869 public void onPrepareOptionsMenu(Menu menu) { 1870 } 1871 1872 /** 1873 * Called when this fragment's option menu items are no longer being 1874 * included in the overall options menu. Receiving this call means that 1875 * the menu needed to be rebuilt, but this fragment's items were not 1876 * included in the newly built menu (its {@link #onCreateOptionsMenu(Menu, MenuInflater)} 1877 * was not called). 1878 */ 1879 public void onDestroyOptionsMenu() { 1880 } 1881 1882 /** 1883 * This hook is called whenever an item in your options menu is selected. 1884 * The default implementation simply returns false to have the normal 1885 * processing happen (calling the item's Runnable or sending a message to 1886 * its Handler as appropriate). You can use this method for any items 1887 * for which you would like to do processing without those other 1888 * facilities. 1889 * 1890 * <p>Derived classes should call through to the base class for it to 1891 * perform the default menu handling. 1892 * 1893 * @param item The menu item that was selected. 1894 * 1895 * @return boolean Return false to allow normal menu processing to 1896 * proceed, true to consume it here. 1897 * 1898 * @see #onCreateOptionsMenu 1899 */ 1900 public boolean onOptionsItemSelected(MenuItem item) { 1901 return false; 1902 } 1903 1904 /** 1905 * This hook is called whenever the options menu is being closed (either by the user canceling 1906 * the menu with the back/menu button, or when an item is selected). 1907 * 1908 * @param menu The options menu as last shown or first initialized by 1909 * onCreateOptionsMenu(). 1910 */ 1911 public void onOptionsMenuClosed(Menu menu) { 1912 } 1913 1914 /** 1915 * Called when a context menu for the {@code view} is about to be shown. 1916 * Unlike {@link #onCreateOptionsMenu}, this will be called every 1917 * time the context menu is about to be shown and should be populated for 1918 * the view (or item inside the view for {@link AdapterView} subclasses, 1919 * this can be found in the {@code menuInfo})). 1920 * <p> 1921 * Use {@link #onContextItemSelected(android.view.MenuItem)} to know when an 1922 * item has been selected. 1923 * <p> 1924 * The default implementation calls up to 1925 * {@link Activity#onCreateContextMenu Activity.onCreateContextMenu}, though 1926 * you can not call this implementation if you don't want that behavior. 1927 * <p> 1928 * It is not safe to hold onto the context menu after this method returns. 1929 * {@inheritDoc} 1930 */ 1931 public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { 1932 getActivity().onCreateContextMenu(menu, v, menuInfo); 1933 } 1934 1935 /** 1936 * Registers a context menu to be shown for the given view (multiple views 1937 * can show the context menu). This method will set the 1938 * {@link OnCreateContextMenuListener} on the view to this fragment, so 1939 * {@link #onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} will be 1940 * called when it is time to show the context menu. 1941 * 1942 * @see #unregisterForContextMenu(View) 1943 * @param view The view that should show a context menu. 1944 */ 1945 public void registerForContextMenu(View view) { 1946 view.setOnCreateContextMenuListener(this); 1947 } 1948 1949 /** 1950 * Prevents a context menu to be shown for the given view. This method will 1951 * remove the {@link OnCreateContextMenuListener} on the view. 1952 * 1953 * @see #registerForContextMenu(View) 1954 * @param view The view that should stop showing a context menu. 1955 */ 1956 public void unregisterForContextMenu(View view) { 1957 view.setOnCreateContextMenuListener(null); 1958 } 1959 1960 /** 1961 * This hook is called whenever an item in a context menu is selected. The 1962 * default implementation simply returns false to have the normal processing 1963 * happen (calling the item's Runnable or sending a message to its Handler 1964 * as appropriate). You can use this method for any items for which you 1965 * would like to do processing without those other facilities. 1966 * <p> 1967 * Use {@link MenuItem#getMenuInfo()} to get extra information set by the 1968 * View that added this menu item. 1969 * <p> 1970 * Derived classes should call through to the base class for it to perform 1971 * the default menu handling. 1972 * 1973 * @param item The context menu item that was selected. 1974 * @return boolean Return false to allow normal context menu processing to 1975 * proceed, true to consume it here. 1976 */ 1977 public boolean onContextItemSelected(MenuItem item) { 1978 return false; 1979 } 1980 1981 /** 1982 * When custom transitions are used with Fragments, the enter transition callback 1983 * is called when this Fragment is attached or detached when not popping the back stack. 1984 * 1985 * @param callback Used to manipulate the shared element transitions on this Fragment 1986 * when added not as a pop from the back stack. 1987 */ 1988 public void setEnterSharedElementCallback(SharedElementCallback callback) { 1989 if (callback == null) { 1990 if (mAnimationInfo == null) { 1991 return; // already a null callback 1992 } 1993 callback = SharedElementCallback.NULL_CALLBACK; 1994 } 1995 ensureAnimationInfo().mEnterTransitionCallback = callback; 1996 } 1997 1998 /** 1999 * When custom transitions are used with Fragments, the exit transition callback 2000 * is called when this Fragment is attached or detached when popping the back stack. 2001 * 2002 * @param callback Used to manipulate the shared element transitions on this Fragment 2003 * when added as a pop from the back stack. 2004 */ 2005 public void setExitSharedElementCallback(SharedElementCallback callback) { 2006 if (callback == null) { 2007 if (mAnimationInfo == null) { 2008 return; // already a null callback 2009 } 2010 callback = SharedElementCallback.NULL_CALLBACK; 2011 } 2012 ensureAnimationInfo().mExitTransitionCallback = callback; 2013 } 2014 2015 /** 2016 * Sets the Transition that will be used to move Views into the initial scene. The entering 2017 * Views will be those that are regular Views or ViewGroups that have 2018 * {@link ViewGroup#isTransitionGroup} return true. Typical Transitions will extend 2019 * {@link android.transition.Visibility} as entering is governed by changing visibility from 2020 * {@link View#INVISIBLE} to {@link View#VISIBLE}. If <code>transition</code> is null, 2021 * entering Views will remain unaffected. 2022 * 2023 * @param transition The Transition to use to move Views into the initial Scene. 2024 * @attr ref android.R.styleable#Fragment_fragmentEnterTransition 2025 */ 2026 public void setEnterTransition(Transition transition) { 2027 if (shouldChangeTransition(transition, null)) { 2028 ensureAnimationInfo().mEnterTransition = transition; 2029 } 2030 } 2031 2032 /** 2033 * Returns the Transition that will be used to move Views into the initial scene. The entering 2034 * Views will be those that are regular Views or ViewGroups that have 2035 * {@link ViewGroup#isTransitionGroup} return true. Typical Transitions will extend 2036 * {@link android.transition.Visibility} as entering is governed by changing visibility from 2037 * {@link View#INVISIBLE} to {@link View#VISIBLE}. 2038 * 2039 * @return the Transition to use to move Views into the initial Scene. 2040 * @attr ref android.R.styleable#Fragment_fragmentEnterTransition 2041 */ 2042 public Transition getEnterTransition() { 2043 if (mAnimationInfo == null) { 2044 return null; 2045 } 2046 return mAnimationInfo.mEnterTransition; 2047 } 2048 2049 /** 2050 * Sets the Transition that will be used to move Views out of the scene when the Fragment is 2051 * preparing to be removed, hidden, or detached because of popping the back stack. The exiting 2052 * Views will be those that are regular Views or ViewGroups that have 2053 * {@link ViewGroup#isTransitionGroup} return true. Typical Transitions will extend 2054 * {@link android.transition.Visibility} as entering is governed by changing visibility from 2055 * {@link View#VISIBLE} to {@link View#INVISIBLE}. If <code>transition</code> is null, 2056 * entering Views will remain unaffected. If nothing is set, the default will be to 2057 * use the same value as set in {@link #setEnterTransition(android.transition.Transition)}. 2058 * 2059 * @param transition The Transition to use to move Views out of the Scene when the Fragment 2060 * is preparing to close. 2061 * @attr ref android.R.styleable#Fragment_fragmentExitTransition 2062 */ 2063 public void setReturnTransition(Transition transition) { 2064 if (shouldChangeTransition(transition, USE_DEFAULT_TRANSITION)) { 2065 ensureAnimationInfo().mReturnTransition = transition; 2066 } 2067 } 2068 2069 /** 2070 * Returns the Transition that will be used to move Views out of the scene when the Fragment is 2071 * preparing to be removed, hidden, or detached because of popping the back stack. The exiting 2072 * Views will be those that are regular Views or ViewGroups that have 2073 * {@link ViewGroup#isTransitionGroup} return true. Typical Transitions will extend 2074 * {@link android.transition.Visibility} as entering is governed by changing visibility from 2075 * {@link View#VISIBLE} to {@link View#INVISIBLE}. If <code>transition</code> is null, 2076 * entering Views will remain unaffected. 2077 * 2078 * @return the Transition to use to move Views out of the Scene when the Fragment 2079 * is preparing to close. 2080 * @attr ref android.R.styleable#Fragment_fragmentExitTransition 2081 */ 2082 public Transition getReturnTransition() { 2083 if (mAnimationInfo == null) { 2084 return null; 2085 } 2086 return mAnimationInfo.mReturnTransition == USE_DEFAULT_TRANSITION ? getEnterTransition() 2087 : mAnimationInfo.mReturnTransition; 2088 } 2089 2090 /** 2091 * Sets the Transition that will be used to move Views out of the scene when the 2092 * fragment is removed, hidden, or detached when not popping the back stack. 2093 * The exiting Views will be those that are regular Views or ViewGroups that 2094 * have {@link ViewGroup#isTransitionGroup} return true. Typical Transitions will extend 2095 * {@link android.transition.Visibility} as exiting is governed by changing visibility 2096 * from {@link View#VISIBLE} to {@link View#INVISIBLE}. If transition is null, the views will 2097 * remain unaffected. 2098 * 2099 * @param transition The Transition to use to move Views out of the Scene when the Fragment 2100 * is being closed not due to popping the back stack. 2101 * @attr ref android.R.styleable#Fragment_fragmentExitTransition 2102 */ 2103 public void setExitTransition(Transition transition) { 2104 if (shouldChangeTransition(transition, null)) { 2105 ensureAnimationInfo().mExitTransition = transition; 2106 } 2107 } 2108 2109 /** 2110 * Returns the Transition that will be used to move Views out of the scene when the 2111 * fragment is removed, hidden, or detached when not popping the back stack. 2112 * The exiting Views will be those that are regular Views or ViewGroups that 2113 * have {@link ViewGroup#isTransitionGroup} return true. Typical Transitions will extend 2114 * {@link android.transition.Visibility} as exiting is governed by changing visibility 2115 * from {@link View#VISIBLE} to {@link View#INVISIBLE}. If transition is null, the views will 2116 * remain unaffected. 2117 * 2118 * @return the Transition to use to move Views out of the Scene when the Fragment 2119 * is being closed not due to popping the back stack. 2120 * @attr ref android.R.styleable#Fragment_fragmentExitTransition 2121 */ 2122 public Transition getExitTransition() { 2123 if (mAnimationInfo == null) { 2124 return null; 2125 } 2126 return mAnimationInfo.mExitTransition; 2127 } 2128 2129 /** 2130 * Sets the Transition that will be used to move Views in to the scene when returning due 2131 * to popping a back stack. The entering Views will be those that are regular Views 2132 * or ViewGroups that have {@link ViewGroup#isTransitionGroup} return true. Typical Transitions 2133 * will extend {@link android.transition.Visibility} as exiting is governed by changing 2134 * visibility from {@link View#VISIBLE} to {@link View#INVISIBLE}. If transition is null, 2135 * the views will remain unaffected. If nothing is set, the default will be to use the same 2136 * transition as {@link #setExitTransition(android.transition.Transition)}. 2137 * 2138 * @param transition The Transition to use to move Views into the scene when reentering from a 2139 * previously-started Activity. 2140 * @attr ref android.R.styleable#Fragment_fragmentReenterTransition 2141 */ 2142 public void setReenterTransition(Transition transition) { 2143 if (shouldChangeTransition(transition, USE_DEFAULT_TRANSITION)) { 2144 ensureAnimationInfo().mReenterTransition = transition; 2145 } 2146 } 2147 2148 /** 2149 * Returns the Transition that will be used to move Views in to the scene when returning due 2150 * to popping a back stack. The entering Views will be those that are regular Views 2151 * or ViewGroups that have {@link ViewGroup#isTransitionGroup} return true. Typical Transitions 2152 * will extend {@link android.transition.Visibility} as exiting is governed by changing 2153 * visibility from {@link View#VISIBLE} to {@link View#INVISIBLE}. If transition is null, 2154 * the views will remain unaffected. If nothing is set, the default will be to use the same 2155 * transition as {@link #setExitTransition(android.transition.Transition)}. 2156 * 2157 * @return the Transition to use to move Views into the scene when reentering from a 2158 * previously-started Activity. 2159 * @attr ref android.R.styleable#Fragment_fragmentReenterTransition 2160 */ 2161 public Transition getReenterTransition() { 2162 if (mAnimationInfo == null) { 2163 return null; 2164 } 2165 return mAnimationInfo.mReenterTransition == USE_DEFAULT_TRANSITION ? getExitTransition() 2166 : mAnimationInfo.mReenterTransition; 2167 } 2168 2169 /** 2170 * Sets the Transition that will be used for shared elements transferred into the content 2171 * Scene. Typical Transitions will affect size and location, such as 2172 * {@link android.transition.ChangeBounds}. A null 2173 * value will cause transferred shared elements to blink to the final position. 2174 * 2175 * @param transition The Transition to use for shared elements transferred into the content 2176 * Scene. 2177 * @attr ref android.R.styleable#Fragment_fragmentSharedElementEnterTransition 2178 */ 2179 public void setSharedElementEnterTransition(Transition transition) { 2180 if (shouldChangeTransition(transition, null)) { 2181 ensureAnimationInfo().mSharedElementEnterTransition = transition; 2182 } 2183 } 2184 2185 /** 2186 * Returns the Transition that will be used for shared elements transferred into the content 2187 * Scene. Typical Transitions will affect size and location, such as 2188 * {@link android.transition.ChangeBounds}. A null 2189 * value will cause transferred shared elements to blink to the final position. 2190 * 2191 * @return The Transition to use for shared elements transferred into the content 2192 * Scene. 2193 * @attr ref android.R.styleable#Fragment_fragmentSharedElementEnterTransition 2194 */ 2195 public Transition getSharedElementEnterTransition() { 2196 if (mAnimationInfo == null) { 2197 return null; 2198 } 2199 return mAnimationInfo.mSharedElementEnterTransition; 2200 } 2201 2202 /** 2203 * Sets the Transition that will be used for shared elements transferred back during a 2204 * pop of the back stack. This Transition acts in the leaving Fragment. 2205 * Typical Transitions will affect size and location, such as 2206 * {@link android.transition.ChangeBounds}. A null 2207 * value will cause transferred shared elements to blink to the final position. 2208 * If no value is set, the default will be to use the same value as 2209 * {@link #setSharedElementEnterTransition(android.transition.Transition)}. 2210 * 2211 * @param transition The Transition to use for shared elements transferred out of the content 2212 * Scene. 2213 * @attr ref android.R.styleable#Fragment_fragmentSharedElementReturnTransition 2214 */ 2215 public void setSharedElementReturnTransition(Transition transition) { 2216 if (shouldChangeTransition(transition, USE_DEFAULT_TRANSITION)) { 2217 ensureAnimationInfo().mSharedElementReturnTransition = transition; 2218 } 2219 } 2220 2221 /** 2222 * Return the Transition that will be used for shared elements transferred back during a 2223 * pop of the back stack. This Transition acts in the leaving Fragment. 2224 * Typical Transitions will affect size and location, such as 2225 * {@link android.transition.ChangeBounds}. A null 2226 * value will cause transferred shared elements to blink to the final position. 2227 * If no value is set, the default will be to use the same value as 2228 * {@link #setSharedElementEnterTransition(android.transition.Transition)}. 2229 * 2230 * @return The Transition to use for shared elements transferred out of the content 2231 * Scene. 2232 * @attr ref android.R.styleable#Fragment_fragmentSharedElementReturnTransition 2233 */ 2234 public Transition getSharedElementReturnTransition() { 2235 if (mAnimationInfo == null) { 2236 return null; 2237 } 2238 return mAnimationInfo.mSharedElementReturnTransition == USE_DEFAULT_TRANSITION 2239 ? getSharedElementEnterTransition() 2240 : mAnimationInfo.mSharedElementReturnTransition; 2241 } 2242 2243 /** 2244 * Sets whether the the exit transition and enter transition overlap or not. 2245 * When true, the enter transition will start as soon as possible. When false, the 2246 * enter transition will wait until the exit transition completes before starting. 2247 * 2248 * @param allow true to start the enter transition when possible or false to 2249 * wait until the exiting transition completes. 2250 * @attr ref android.R.styleable#Fragment_fragmentAllowEnterTransitionOverlap 2251 */ 2252 public void setAllowEnterTransitionOverlap(boolean allow) { 2253 ensureAnimationInfo().mAllowEnterTransitionOverlap = allow; 2254 } 2255 2256 /** 2257 * Returns whether the the exit transition and enter transition overlap or not. 2258 * When true, the enter transition will start as soon as possible. When false, the 2259 * enter transition will wait until the exit transition completes before starting. 2260 * 2261 * @return true when the enter transition should start as soon as possible or false to 2262 * when it should wait until the exiting transition completes. 2263 * @attr ref android.R.styleable#Fragment_fragmentAllowEnterTransitionOverlap 2264 */ 2265 public boolean getAllowEnterTransitionOverlap() { 2266 return (mAnimationInfo == null || mAnimationInfo.mAllowEnterTransitionOverlap == null) 2267 ? true : mAnimationInfo.mAllowEnterTransitionOverlap; 2268 } 2269 2270 /** 2271 * Sets whether the the return transition and reenter transition overlap or not. 2272 * When true, the reenter transition will start as soon as possible. When false, the 2273 * reenter transition will wait until the return transition completes before starting. 2274 * 2275 * @param allow true to start the reenter transition when possible or false to wait until the 2276 * return transition completes. 2277 * @attr ref android.R.styleable#Fragment_fragmentAllowReturnTransitionOverlap 2278 */ 2279 public void setAllowReturnTransitionOverlap(boolean allow) { 2280 ensureAnimationInfo().mAllowReturnTransitionOverlap = allow; 2281 } 2282 2283 /** 2284 * Returns whether the the return transition and reenter transition overlap or not. 2285 * When true, the reenter transition will start as soon as possible. When false, the 2286 * reenter transition will wait until the return transition completes before starting. 2287 * 2288 * @return true to start the reenter transition when possible or false to wait until the 2289 * return transition completes. 2290 * @attr ref android.R.styleable#Fragment_fragmentAllowReturnTransitionOverlap 2291 */ 2292 public boolean getAllowReturnTransitionOverlap() { 2293 return (mAnimationInfo == null || mAnimationInfo.mAllowReturnTransitionOverlap == null) 2294 ? true : mAnimationInfo.mAllowReturnTransitionOverlap; 2295 } 2296 2297 /** 2298 * Postpone the entering Fragment transition until {@link #startPostponedEnterTransition()} 2299 * or {@link FragmentManager#executePendingTransactions()} has been called. 2300 * <p> 2301 * This method gives the Fragment the ability to delay Fragment animations 2302 * until all data is loaded. Until then, the added, shown, and 2303 * attached Fragments will be INVISIBLE and removed, hidden, and detached Fragments won't 2304 * be have their Views removed. The transaction runs when all postponed added Fragments in the 2305 * transaction have called {@link #startPostponedEnterTransition()}. 2306 * <p> 2307 * This method should be called before being added to the FragmentTransaction or 2308 * in {@link #onCreate(Bundle), {@link #onAttach(Context)}, or 2309 * {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}}. 2310 * {@link #startPostponedEnterTransition()} must be called to allow the Fragment to 2311 * start the transitions. 2312 * <p> 2313 * When a FragmentTransaction is started that may affect a postponed FragmentTransaction, 2314 * based on which containers are in their operations, the postponed FragmentTransaction 2315 * will have its start triggered. The early triggering may result in faulty or nonexistent 2316 * animations in the postponed transaction. FragmentTransactions that operate only on 2317 * independent containers will not interfere with each other's postponement. 2318 * <p> 2319 * Calling postponeEnterTransition on Fragments with a null View will not postpone the 2320 * transition. Likewise, postponement only works if FragmentTransaction optimizations are 2321 * enabled. 2322 * 2323 * @see Activity#postponeEnterTransition() 2324 * @see FragmentTransaction#setAllowOptimization(boolean) 2325 */ 2326 public void postponeEnterTransition() { 2327 ensureAnimationInfo().mEnterTransitionPostponed = true; 2328 } 2329 2330 /** 2331 * Begin postponed transitions after {@link #postponeEnterTransition()} was called. 2332 * If postponeEnterTransition() was called, you must call startPostponedEnterTransition() 2333 * or {@link FragmentManager#executePendingTransactions()} to complete the FragmentTransaction. 2334 * If postponement was interrupted with {@link FragmentManager#executePendingTransactions()}, 2335 * before {@code startPostponedEnterTransition()}, animations may not run or may execute 2336 * improperly. 2337 * 2338 * @see Activity#startPostponedEnterTransition() 2339 */ 2340 public void startPostponedEnterTransition() { 2341 if (mFragmentManager == null || mFragmentManager.mHost == null) { 2342 ensureAnimationInfo().mEnterTransitionPostponed = false; 2343 } else if (Looper.myLooper() != mFragmentManager.mHost.getHandler().getLooper()) { 2344 mFragmentManager.mHost.getHandler(). 2345 postAtFrontOfQueue(this::callStartTransitionListener); 2346 } else { 2347 callStartTransitionListener(); 2348 } 2349 } 2350 2351 /** 2352 * Calls the start transition listener. This must be called on the UI thread. 2353 */ 2354 private void callStartTransitionListener() { 2355 final OnStartEnterTransitionListener listener; 2356 if (mAnimationInfo == null) { 2357 listener = null; 2358 } else { 2359 mAnimationInfo.mEnterTransitionPostponed = false; 2360 listener = mAnimationInfo.mStartEnterTransitionListener; 2361 mAnimationInfo.mStartEnterTransitionListener = null; 2362 } 2363 if (listener != null) { 2364 listener.onStartEnterTransition(); 2365 } 2366 } 2367 2368 /** 2369 * Returns true if mAnimationInfo is not null or the transition differs from the default value. 2370 * This is broken out to ensure mAnimationInfo is properly locked when checking. 2371 */ 2372 private boolean shouldChangeTransition(Transition transition, Transition defaultValue) { 2373 if (transition == defaultValue) { 2374 return mAnimationInfo != null; 2375 } 2376 return true; 2377 } 2378 2379 /** 2380 * Print the Fragments's state into the given stream. 2381 * 2382 * @param prefix Text to print at the front of each line. 2383 * @param fd The raw file descriptor that the dump is being sent to. 2384 * @param writer The PrintWriter to which you should dump your state. This will be 2385 * closed for you after you return. 2386 * @param args additional arguments to the dump request. 2387 */ 2388 public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) { 2389 writer.print(prefix); writer.print("mFragmentId=#"); 2390 writer.print(Integer.toHexString(mFragmentId)); 2391 writer.print(" mContainerId=#"); 2392 writer.print(Integer.toHexString(mContainerId)); 2393 writer.print(" mTag="); writer.println(mTag); 2394 writer.print(prefix); writer.print("mState="); writer.print(mState); 2395 writer.print(" mIndex="); writer.print(mIndex); 2396 writer.print(" mWho="); writer.print(mWho); 2397 writer.print(" mBackStackNesting="); writer.println(mBackStackNesting); 2398 writer.print(prefix); writer.print("mAdded="); writer.print(mAdded); 2399 writer.print(" mRemoving="); writer.print(mRemoving); 2400 writer.print(" mFromLayout="); writer.print(mFromLayout); 2401 writer.print(" mInLayout="); writer.println(mInLayout); 2402 writer.print(prefix); writer.print("mHidden="); writer.print(mHidden); 2403 writer.print(" mDetached="); writer.print(mDetached); 2404 writer.print(" mMenuVisible="); writer.print(mMenuVisible); 2405 writer.print(" mHasMenu="); writer.println(mHasMenu); 2406 writer.print(prefix); writer.print("mRetainInstance="); writer.print(mRetainInstance); 2407 writer.print(" mRetaining="); writer.print(mRetaining); 2408 writer.print(" mUserVisibleHint="); writer.println(mUserVisibleHint); 2409 if (mFragmentManager != null) { 2410 writer.print(prefix); writer.print("mFragmentManager="); 2411 writer.println(mFragmentManager); 2412 } 2413 if (mHost != null) { 2414 writer.print(prefix); writer.print("mHost="); 2415 writer.println(mHost); 2416 } 2417 if (mParentFragment != null) { 2418 writer.print(prefix); writer.print("mParentFragment="); 2419 writer.println(mParentFragment); 2420 } 2421 if (mArguments != null) { 2422 writer.print(prefix); writer.print("mArguments="); writer.println(mArguments); 2423 } 2424 if (mSavedFragmentState != null) { 2425 writer.print(prefix); writer.print("mSavedFragmentState="); 2426 writer.println(mSavedFragmentState); 2427 } 2428 if (mSavedViewState != null) { 2429 writer.print(prefix); writer.print("mSavedViewState="); 2430 writer.println(mSavedViewState); 2431 } 2432 if (mTarget != null) { 2433 writer.print(prefix); writer.print("mTarget="); writer.print(mTarget); 2434 writer.print(" mTargetRequestCode="); 2435 writer.println(mTargetRequestCode); 2436 } 2437 if (getNextAnim() != 0) { 2438 writer.print(prefix); writer.print("mNextAnim="); writer.println(getNextAnim()); 2439 } 2440 if (mContainer != null) { 2441 writer.print(prefix); writer.print("mContainer="); writer.println(mContainer); 2442 } 2443 if (mView != null) { 2444 writer.print(prefix); writer.print("mView="); writer.println(mView); 2445 } 2446 if (getAnimatingAway() != null) { 2447 writer.print(prefix); writer.print("mAnimatingAway="); 2448 writer.println(getAnimatingAway()); 2449 writer.print(prefix); writer.print("mStateAfterAnimating="); 2450 writer.println(getStateAfterAnimating()); 2451 } 2452 if (mLoaderManager != null) { 2453 writer.print(prefix); writer.println("Loader Manager:"); 2454 mLoaderManager.dump(prefix + " ", fd, writer, args); 2455 } 2456 if (mChildFragmentManager != null) { 2457 writer.print(prefix); writer.println("Child " + mChildFragmentManager + ":"); 2458 mChildFragmentManager.dump(prefix + " ", fd, writer, args); 2459 } 2460 } 2461 2462 Fragment findFragmentByWho(String who) { 2463 if (who.equals(mWho)) { 2464 return this; 2465 } 2466 if (mChildFragmentManager != null) { 2467 return mChildFragmentManager.findFragmentByWho(who); 2468 } 2469 return null; 2470 } 2471 2472 void instantiateChildFragmentManager() { 2473 mChildFragmentManager = new FragmentManagerImpl(); 2474 mChildFragmentManager.attachController(mHost, new FragmentContainer() { 2475 @Override 2476 @Nullable 2477 public View onFindViewById(int id) { 2478 if (mView == null) { 2479 throw new IllegalStateException("Fragment does not have a view"); 2480 } 2481 return mView.findViewById(id); 2482 } 2483 2484 @Override 2485 public boolean onHasView() { 2486 return (mView != null); 2487 } 2488 }, this); 2489 } 2490 2491 void performCreate(Bundle savedInstanceState) { 2492 if (mChildFragmentManager != null) { 2493 mChildFragmentManager.noteStateNotSaved(); 2494 } 2495 mState = CREATED; 2496 mCalled = false; 2497 onCreate(savedInstanceState); 2498 if (!mCalled) { 2499 throw new SuperNotCalledException("Fragment " + this 2500 + " did not call through to super.onCreate()"); 2501 } 2502 final Context context = getContext(); 2503 final int version = context != null ? context.getApplicationInfo().targetSdkVersion : 0; 2504 if (version < Build.VERSION_CODES.N) { 2505 restoreChildFragmentState(savedInstanceState, false); 2506 } 2507 } 2508 2509 View performCreateView(LayoutInflater inflater, ViewGroup container, 2510 Bundle savedInstanceState) { 2511 if (mChildFragmentManager != null) { 2512 mChildFragmentManager.noteStateNotSaved(); 2513 } 2514 mPerformedCreateView = true; 2515 return onCreateView(inflater, container, savedInstanceState); 2516 } 2517 2518 void performActivityCreated(Bundle savedInstanceState) { 2519 if (mChildFragmentManager != null) { 2520 mChildFragmentManager.noteStateNotSaved(); 2521 } 2522 mState = ACTIVITY_CREATED; 2523 mCalled = false; 2524 onActivityCreated(savedInstanceState); 2525 if (!mCalled) { 2526 throw new SuperNotCalledException("Fragment " + this 2527 + " did not call through to super.onActivityCreated()"); 2528 } 2529 if (mChildFragmentManager != null) { 2530 mChildFragmentManager.dispatchActivityCreated(); 2531 } 2532 } 2533 2534 void performStart() { 2535 if (mChildFragmentManager != null) { 2536 mChildFragmentManager.noteStateNotSaved(); 2537 mChildFragmentManager.execPendingActions(); 2538 } 2539 mState = STARTED; 2540 mCalled = false; 2541 onStart(); 2542 if (!mCalled) { 2543 throw new SuperNotCalledException("Fragment " + this 2544 + " did not call through to super.onStart()"); 2545 } 2546 if (mChildFragmentManager != null) { 2547 mChildFragmentManager.dispatchStart(); 2548 } 2549 if (mLoaderManager != null) { 2550 mLoaderManager.doReportStart(); 2551 } 2552 } 2553 2554 void performResume() { 2555 if (mChildFragmentManager != null) { 2556 mChildFragmentManager.noteStateNotSaved(); 2557 mChildFragmentManager.execPendingActions(); 2558 } 2559 mState = RESUMED; 2560 mCalled = false; 2561 onResume(); 2562 if (!mCalled) { 2563 throw new SuperNotCalledException("Fragment " + this 2564 + " did not call through to super.onResume()"); 2565 } 2566 if (mChildFragmentManager != null) { 2567 mChildFragmentManager.dispatchResume(); 2568 mChildFragmentManager.execPendingActions(); 2569 } 2570 } 2571 2572 void performMultiWindowModeChanged(boolean isInMultiWindowMode) { 2573 onMultiWindowModeChanged(isInMultiWindowMode); 2574 if (mChildFragmentManager != null) { 2575 mChildFragmentManager.dispatchMultiWindowModeChanged(isInMultiWindowMode); 2576 } 2577 } 2578 2579 void performPictureInPictureModeChanged(boolean isInPictureInPictureMode) { 2580 onPictureInPictureModeChanged(isInPictureInPictureMode); 2581 if (mChildFragmentManager != null) { 2582 mChildFragmentManager.dispatchPictureInPictureModeChanged(isInPictureInPictureMode); 2583 } 2584 } 2585 2586 void performConfigurationChanged(Configuration newConfig) { 2587 onConfigurationChanged(newConfig); 2588 if (mChildFragmentManager != null) { 2589 mChildFragmentManager.dispatchConfigurationChanged(newConfig); 2590 } 2591 } 2592 2593 void performLowMemory() { 2594 onLowMemory(); 2595 if (mChildFragmentManager != null) { 2596 mChildFragmentManager.dispatchLowMemory(); 2597 } 2598 } 2599 2600 void performTrimMemory(int level) { 2601 onTrimMemory(level); 2602 if (mChildFragmentManager != null) { 2603 mChildFragmentManager.dispatchTrimMemory(level); 2604 } 2605 } 2606 2607 boolean performCreateOptionsMenu(Menu menu, MenuInflater inflater) { 2608 boolean show = false; 2609 if (!mHidden) { 2610 if (mHasMenu && mMenuVisible) { 2611 show = true; 2612 onCreateOptionsMenu(menu, inflater); 2613 } 2614 if (mChildFragmentManager != null) { 2615 show |= mChildFragmentManager.dispatchCreateOptionsMenu(menu, inflater); 2616 } 2617 } 2618 return show; 2619 } 2620 2621 boolean performPrepareOptionsMenu(Menu menu) { 2622 boolean show = false; 2623 if (!mHidden) { 2624 if (mHasMenu && mMenuVisible) { 2625 show = true; 2626 onPrepareOptionsMenu(menu); 2627 } 2628 if (mChildFragmentManager != null) { 2629 show |= mChildFragmentManager.dispatchPrepareOptionsMenu(menu); 2630 } 2631 } 2632 return show; 2633 } 2634 2635 boolean performOptionsItemSelected(MenuItem item) { 2636 if (!mHidden) { 2637 if (mHasMenu && mMenuVisible) { 2638 if (onOptionsItemSelected(item)) { 2639 return true; 2640 } 2641 } 2642 if (mChildFragmentManager != null) { 2643 if (mChildFragmentManager.dispatchOptionsItemSelected(item)) { 2644 return true; 2645 } 2646 } 2647 } 2648 return false; 2649 } 2650 2651 boolean performContextItemSelected(MenuItem item) { 2652 if (!mHidden) { 2653 if (onContextItemSelected(item)) { 2654 return true; 2655 } 2656 if (mChildFragmentManager != null) { 2657 if (mChildFragmentManager.dispatchContextItemSelected(item)) { 2658 return true; 2659 } 2660 } 2661 } 2662 return false; 2663 } 2664 2665 void performOptionsMenuClosed(Menu menu) { 2666 if (!mHidden) { 2667 if (mHasMenu && mMenuVisible) { 2668 onOptionsMenuClosed(menu); 2669 } 2670 if (mChildFragmentManager != null) { 2671 mChildFragmentManager.dispatchOptionsMenuClosed(menu); 2672 } 2673 } 2674 } 2675 2676 void performSaveInstanceState(Bundle outState) { 2677 onSaveInstanceState(outState); 2678 if (mChildFragmentManager != null) { 2679 Parcelable p = mChildFragmentManager.saveAllState(); 2680 if (p != null) { 2681 outState.putParcelable(Activity.FRAGMENTS_TAG, p); 2682 } 2683 } 2684 } 2685 2686 void performPause() { 2687 if (mChildFragmentManager != null) { 2688 mChildFragmentManager.dispatchPause(); 2689 } 2690 mState = STARTED; 2691 mCalled = false; 2692 onPause(); 2693 if (!mCalled) { 2694 throw new SuperNotCalledException("Fragment " + this 2695 + " did not call through to super.onPause()"); 2696 } 2697 } 2698 2699 void performStop() { 2700 if (mChildFragmentManager != null) { 2701 mChildFragmentManager.dispatchStop(); 2702 } 2703 mState = STOPPED; 2704 mCalled = false; 2705 onStop(); 2706 if (!mCalled) { 2707 throw new SuperNotCalledException("Fragment " + this 2708 + " did not call through to super.onStop()"); 2709 } 2710 2711 if (mLoadersStarted) { 2712 mLoadersStarted = false; 2713 if (!mCheckedForLoaderManager) { 2714 mCheckedForLoaderManager = true; 2715 mLoaderManager = mHost.getLoaderManager(mWho, mLoadersStarted, false); 2716 } 2717 if (mLoaderManager != null) { 2718 if (mHost.getRetainLoaders()) { 2719 mLoaderManager.doRetain(); 2720 } else { 2721 mLoaderManager.doStop(); 2722 } 2723 } 2724 } 2725 } 2726 2727 void performDestroyView() { 2728 if (mChildFragmentManager != null) { 2729 mChildFragmentManager.dispatchDestroyView(); 2730 } 2731 mState = CREATED; 2732 mCalled = false; 2733 onDestroyView(); 2734 if (!mCalled) { 2735 throw new SuperNotCalledException("Fragment " + this 2736 + " did not call through to super.onDestroyView()"); 2737 } 2738 if (mLoaderManager != null) { 2739 mLoaderManager.doReportNextStart(); 2740 } 2741 mPerformedCreateView = false; 2742 } 2743 2744 void performDestroy() { 2745 if (mChildFragmentManager != null) { 2746 mChildFragmentManager.dispatchDestroy(); 2747 } 2748 mState = INITIALIZING; 2749 mCalled = false; 2750 onDestroy(); 2751 if (!mCalled) { 2752 throw new SuperNotCalledException("Fragment " + this 2753 + " did not call through to super.onDestroy()"); 2754 } 2755 mChildFragmentManager = null; 2756 } 2757 2758 void performDetach() { 2759 mCalled = false; 2760 onDetach(); 2761 if (!mCalled) { 2762 throw new SuperNotCalledException("Fragment " + this 2763 + " did not call through to super.onDetach()"); 2764 } 2765 2766 // Destroy the child FragmentManager if we still have it here. 2767 // We won't unless we're retaining our instance and if we do, 2768 // our child FragmentManager instance state will have already been saved. 2769 if (mChildFragmentManager != null) { 2770 if (!mRetaining) { 2771 throw new IllegalStateException("Child FragmentManager of " + this + " was not " 2772 + " destroyed and this fragment is not retaining instance"); 2773 } 2774 mChildFragmentManager.dispatchDestroy(); 2775 mChildFragmentManager = null; 2776 } 2777 } 2778 2779 void setOnStartEnterTransitionListener(OnStartEnterTransitionListener listener) { 2780 ensureAnimationInfo(); 2781 if (listener == mAnimationInfo.mStartEnterTransitionListener) { 2782 return; 2783 } 2784 if (listener != null && mAnimationInfo.mStartEnterTransitionListener != null) { 2785 throw new IllegalStateException("Trying to set a replacement " + 2786 "startPostponedEnterTransition on " + this); 2787 } 2788 if (mAnimationInfo.mEnterTransitionPostponed) { 2789 mAnimationInfo.mStartEnterTransitionListener = listener; 2790 } 2791 if (listener != null) { 2792 listener.startListening(); 2793 } 2794 } 2795 2796 private static Transition loadTransition(Context context, TypedArray typedArray, 2797 Transition currentValue, Transition defaultValue, int id) { 2798 if (currentValue != defaultValue) { 2799 return currentValue; 2800 } 2801 int transitionId = typedArray.getResourceId(id, 0); 2802 Transition transition = defaultValue; 2803 if (transitionId != 0 && transitionId != com.android.internal.R.transition.no_transition) { 2804 TransitionInflater inflater = TransitionInflater.from(context); 2805 transition = inflater.inflateTransition(transitionId); 2806 if (transition instanceof TransitionSet && 2807 ((TransitionSet)transition).getTransitionCount() == 0) { 2808 transition = null; 2809 } 2810 } 2811 return transition; 2812 } 2813 2814 private AnimationInfo ensureAnimationInfo() { 2815 if (mAnimationInfo == null) { 2816 mAnimationInfo = new AnimationInfo(); 2817 } 2818 return mAnimationInfo; 2819 } 2820 2821 int getNextAnim() { 2822 if (mAnimationInfo == null) { 2823 return 0; 2824 } 2825 return mAnimationInfo.mNextAnim; 2826 } 2827 2828 void setNextAnim(int animResourceId) { 2829 if (mAnimationInfo == null && animResourceId == 0) { 2830 return; // no change! 2831 } 2832 ensureAnimationInfo().mNextAnim = animResourceId; 2833 } 2834 2835 int getNextTransition() { 2836 if (mAnimationInfo == null) { 2837 return 0; 2838 } 2839 return mAnimationInfo.mNextTransition; 2840 } 2841 2842 void setNextTransition(int nextTransition, int nextTransitionStyle) { 2843 if (mAnimationInfo == null && nextTransition == 0 && nextTransitionStyle == 0) { 2844 return; // no change! 2845 } 2846 ensureAnimationInfo(); 2847 mAnimationInfo.mNextTransition = nextTransition; 2848 mAnimationInfo.mNextTransitionStyle = nextTransitionStyle; 2849 } 2850 2851 int getNextTransitionStyle() { 2852 if (mAnimationInfo == null) { 2853 return 0; 2854 } 2855 return mAnimationInfo.mNextTransitionStyle; 2856 } 2857 2858 SharedElementCallback getEnterTransitionCallback() { 2859 if (mAnimationInfo == null) { 2860 return SharedElementCallback.NULL_CALLBACK; 2861 } 2862 return mAnimationInfo.mEnterTransitionCallback; 2863 } 2864 2865 SharedElementCallback getExitTransitionCallback() { 2866 if (mAnimationInfo == null) { 2867 return SharedElementCallback.NULL_CALLBACK; 2868 } 2869 return mAnimationInfo.mExitTransitionCallback; 2870 } 2871 2872 Animator getAnimatingAway() { 2873 if (mAnimationInfo == null) { 2874 return null; 2875 } 2876 return mAnimationInfo.mAnimatingAway; 2877 } 2878 2879 void setAnimatingAway(Animator animator) { 2880 ensureAnimationInfo().mAnimatingAway = animator; 2881 } 2882 2883 int getStateAfterAnimating() { 2884 if (mAnimationInfo == null) { 2885 return 0; 2886 } 2887 return mAnimationInfo.mStateAfterAnimating; 2888 } 2889 2890 void setStateAfterAnimating(int state) { 2891 ensureAnimationInfo().mStateAfterAnimating = state; 2892 } 2893 2894 boolean isPostponed() { 2895 if (mAnimationInfo == null) { 2896 return false; 2897 } 2898 return mAnimationInfo.mEnterTransitionPostponed; 2899 } 2900 2901 boolean isHideReplaced() { 2902 if (mAnimationInfo == null) { 2903 return false; 2904 } 2905 return mAnimationInfo.mIsHideReplaced; 2906 } 2907 2908 void setHideReplaced(boolean replaced) { 2909 ensureAnimationInfo().mIsHideReplaced = replaced; 2910 } 2911 2912 /** 2913 * Used internally to be notified when {@link #startPostponedEnterTransition()} has 2914 * been called. This listener will only be called once and then be removed from the 2915 * listeners. 2916 */ 2917 interface OnStartEnterTransitionListener { 2918 void onStartEnterTransition(); 2919 void startListening(); 2920 } 2921 2922 /** 2923 * Contains all the animation and transition information for a fragment. This will only 2924 * be instantiated for Fragments that have Views. 2925 */ 2926 static class AnimationInfo { 2927 // Non-null if the fragment's view hierarchy is currently animating away, 2928 // meaning we need to wait a bit on completely destroying it. This is the 2929 // animation that is running. 2930 Animator mAnimatingAway; 2931 2932 // If mAnimatingAway != null, this is the state we should move to once the 2933 // animation is done. 2934 int mStateAfterAnimating; 2935 2936 // If app has requested a specific animation, this is the one to use. 2937 int mNextAnim; 2938 2939 // If app has requested a specific transition, this is the one to use. 2940 int mNextTransition; 2941 2942 // If app has requested a specific transition style, this is the one to use. 2943 int mNextTransitionStyle; 2944 2945 private Transition mEnterTransition = null; 2946 private Transition mReturnTransition = USE_DEFAULT_TRANSITION; 2947 private Transition mExitTransition = null; 2948 private Transition mReenterTransition = USE_DEFAULT_TRANSITION; 2949 private Transition mSharedElementEnterTransition = null; 2950 private Transition mSharedElementReturnTransition = USE_DEFAULT_TRANSITION; 2951 private Boolean mAllowReturnTransitionOverlap; 2952 private Boolean mAllowEnterTransitionOverlap; 2953 2954 SharedElementCallback mEnterTransitionCallback = SharedElementCallback.NULL_CALLBACK; 2955 SharedElementCallback mExitTransitionCallback = SharedElementCallback.NULL_CALLBACK; 2956 2957 // True when postponeEnterTransition has been called and startPostponeEnterTransition 2958 // hasn't been called yet. 2959 boolean mEnterTransitionPostponed; 2960 2961 // Listener to wait for startPostponeEnterTransition. After being called, it will 2962 // be set to null 2963 OnStartEnterTransitionListener mStartEnterTransitionListener; 2964 2965 // True if the View was hidden, but the transition is handling the hide 2966 boolean mIsHideReplaced; 2967 } 2968} 2969