FragmentActivity.java revision e1e957f536c20ebe2a7e6c417ccb2fd8f7fa845b
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.support.v4.app; 18 19import android.app.Activity; 20import android.content.Context; 21import android.content.Intent; 22import android.content.res.Configuration; 23import android.content.res.Resources; 24import android.os.Bundle; 25import android.os.Handler; 26import android.os.Message; 27import android.os.Parcelable; 28import android.support.annotation.NonNull; 29import android.support.annotation.Nullable; 30import android.support.v4.util.SimpleArrayMap; 31import android.util.AttributeSet; 32import android.util.Log; 33import android.view.KeyEvent; 34import android.view.LayoutInflater; 35import android.view.Menu; 36import android.view.MenuItem; 37import android.view.View; 38import android.view.ViewGroup; 39import android.view.Window; 40 41import java.io.FileDescriptor; 42import java.io.PrintWriter; 43import java.util.ArrayList; 44import java.util.List; 45 46/** 47 * Base class for activities that want to use the support-based 48 * {@link android.support.v4.app.Fragment} and 49 * {@link android.support.v4.content.Loader} APIs. 50 * 51 * <p>When using this class as opposed to new platform's built-in fragment 52 * and loader support, you must use the {@link #getSupportFragmentManager()} 53 * and {@link #getSupportLoaderManager()} methods respectively to access 54 * those features. 55 * 56 * <p class="note"><strong>Note:</strong> If you want to implement an activity that includes 57 * an <a href="{@docRoot}guide/topics/ui/actionbar.html">action bar</a>, you should instead use 58 * the {@link android.support.v7.app.ActionBarActivity} class, which is a subclass of this one, 59 * so allows you to use {@link android.support.v4.app.Fragment} APIs on API level 7 and higher.</p> 60 * 61 * <p>Known limitations:</p> 62 * <ul> 63 * <li> <p>When using the <code><fragment></code> tag, this implementation can not 64 * use the parent view's ID as the new fragment's ID. You must explicitly 65 * specify an ID (or tag) in the <code><fragment></code>.</p> 66 * <li> <p>Prior to Honeycomb (3.0), an activity's state was saved before pausing. 67 * Fragments are a significant amount of new state, and dynamic enough that one 68 * often wants them to change between pausing and stopping. These classes 69 * throw an exception if you try to change the fragment state after it has been 70 * saved, to avoid accidental loss of UI state. However this is too restrictive 71 * prior to Honeycomb, where the state is saved before pausing. To address this, 72 * when running on platforms prior to Honeycomb an exception will not be thrown 73 * if you change fragments between the state save and the activity being stopped. 74 * This means that in some cases if the activity is restored from its last saved 75 * state, this may be a snapshot slightly before what the user last saw.</p> 76 * </ul> 77 */ 78public class FragmentActivity extends BaseFragmentActivityHoneycomb implements 79 ActivityCompat.OnRequestPermissionsResultCallback, 80 ActivityCompatApi23.RequestPermissionsRequestCodeValidator { 81 private static final String TAG = "FragmentActivity"; 82 83 static final String FRAGMENTS_TAG = "android:support:fragments"; 84 85 // This is the SDK API version of Honeycomb (3.0). 86 private static final int HONEYCOMB = 11; 87 88 static final int MSG_REALLY_STOPPED = 1; 89 static final int MSG_RESUME_PENDING = 2; 90 91 final Handler mHandler = new Handler() { 92 @Override 93 public void handleMessage(Message msg) { 94 switch (msg.what) { 95 case MSG_REALLY_STOPPED: 96 if (mStopped) { 97 doReallyStop(false); 98 } 99 break; 100 case MSG_RESUME_PENDING: 101 onResumeFragments(); 102 mFragments.execPendingActions(); 103 break; 104 default: 105 super.handleMessage(msg); 106 } 107 } 108 109 }; 110 final FragmentController mFragments = FragmentController.createController(new HostCallbacks()); 111 112 boolean mCreated; 113 boolean mResumed; 114 boolean mStopped; 115 boolean mReallyStopped; 116 boolean mRetaining; 117 118 boolean mOptionsMenuInvalidated; 119 boolean mRequestedPermissionsFromFragment; 120 121 static final class NonConfigurationInstances { 122 Object custom; 123 List<Fragment> fragments; 124 SimpleArrayMap<String, LoaderManager> loaders; 125 } 126 127 // ------------------------------------------------------------------------ 128 // HOOKS INTO ACTIVITY 129 // ------------------------------------------------------------------------ 130 131 /** 132 * Dispatch incoming result to the correct fragment. 133 */ 134 @Override 135 protected void onActivityResult(int requestCode, int resultCode, Intent data) { 136 mFragments.noteStateNotSaved(); 137 int index = requestCode>>16; 138 if (index != 0) { 139 index--; 140 final int activeFragmentsCount = mFragments.getActiveFragmentsCount(); 141 if (activeFragmentsCount == 0 || index < 0 || index >= activeFragmentsCount) { 142 Log.w(TAG, "Activity result fragment index out of range: 0x" 143 + Integer.toHexString(requestCode)); 144 return; 145 } 146 final List<Fragment> activeFragments = 147 mFragments.getActiveFragments(new ArrayList<Fragment>(activeFragmentsCount)); 148 Fragment frag = activeFragments.get(index); 149 if (frag == null) { 150 Log.w(TAG, "Activity result no fragment exists for index: 0x" 151 + Integer.toHexString(requestCode)); 152 } else { 153 frag.onActivityResult(requestCode&0xffff, resultCode, data); 154 } 155 return; 156 } 157 158 super.onActivityResult(requestCode, resultCode, data); 159 } 160 161 /** 162 * Take care of popping the fragment back stack or finishing the activity 163 * as appropriate. 164 */ 165 public void onBackPressed() { 166 if (!mFragments.getSupportFragmentManager().popBackStackImmediate()) { 167 supportFinishAfterTransition(); 168 } 169 } 170 171 /** 172 * Reverses the Activity Scene entry Transition and triggers the calling Activity 173 * to reverse its exit Transition. When the exit Transition completes, 174 * {@link #finish()} is called. If no entry Transition was used, finish() is called 175 * immediately and the Activity exit Transition is run. 176 * 177 * <p>On Android 4.4 or lower, this method only finishes the Activity with no 178 * special exit transition.</p> 179 */ 180 public void supportFinishAfterTransition() { 181 ActivityCompat.finishAfterTransition(this); 182 } 183 184 /** 185 * When {@link android.app.ActivityOptions#makeSceneTransitionAnimation(Activity, 186 * android.view.View, String)} was used to start an Activity, <var>callback</var> 187 * will be called to handle shared elements on the <i>launched</i> Activity. This requires 188 * {@link Window#FEATURE_CONTENT_TRANSITIONS}. 189 * 190 * @param callback Used to manipulate shared element transitions on the launched Activity. 191 */ 192 public void setEnterSharedElementCallback(SharedElementCallback callback) { 193 ActivityCompat.setEnterSharedElementCallback(this, callback); 194 } 195 196 /** 197 * When {@link android.app.ActivityOptions#makeSceneTransitionAnimation(Activity, 198 * android.view.View, String)} was used to start an Activity, <var>listener</var> 199 * will be called to handle shared elements on the <i>launching</i> Activity. Most 200 * calls will only come when returning from the started Activity. 201 * This requires {@link Window#FEATURE_CONTENT_TRANSITIONS}. 202 * 203 * @param listener Used to manipulate shared element transitions on the launching Activity. 204 */ 205 public void setExitSharedElementCallback(SharedElementCallback listener) { 206 ActivityCompat.setExitSharedElementCallback(this, listener); 207 } 208 209 /** 210 * Support library version of {@link android.app.Activity#postponeEnterTransition()} that works 211 * only on API 21 and later. 212 */ 213 public void supportPostponeEnterTransition() { 214 ActivityCompat.postponeEnterTransition(this); 215 } 216 217 /** 218 * Support library version of {@link android.app.Activity#startPostponedEnterTransition()} 219 * that only works with API 21 and later. 220 */ 221 public void supportStartPostponedEnterTransition() { 222 ActivityCompat.startPostponedEnterTransition(this); 223 } 224 225 /** 226 * Dispatch configuration change to all fragments. 227 */ 228 @Override 229 public void onConfigurationChanged(Configuration newConfig) { 230 super.onConfigurationChanged(newConfig); 231 mFragments.dispatchConfigurationChanged(newConfig); 232 } 233 234 /** 235 * Perform initialization of all fragments and loaders. 236 */ 237 @SuppressWarnings("deprecation") 238 @Override 239 protected void onCreate(@Nullable Bundle savedInstanceState) { 240 mFragments.attachHost(null /*parent*/); 241 242 super.onCreate(savedInstanceState); 243 244 NonConfigurationInstances nc = 245 (NonConfigurationInstances) getLastNonConfigurationInstance(); 246 if (nc != null) { 247 mFragments.restoreLoaderNonConfig(nc.loaders); 248 } 249 if (savedInstanceState != null) { 250 Parcelable p = savedInstanceState.getParcelable(FRAGMENTS_TAG); 251 mFragments.restoreAllState(p, nc != null ? nc.fragments : null); 252 } 253 mFragments.dispatchCreate(); 254 } 255 256 /** 257 * Dispatch to Fragment.onCreateOptionsMenu(). 258 */ 259 @Override 260 public boolean onCreatePanelMenu(int featureId, Menu menu) { 261 if (featureId == Window.FEATURE_OPTIONS_PANEL) { 262 boolean show = super.onCreatePanelMenu(featureId, menu); 263 show |= mFragments.dispatchCreateOptionsMenu(menu, getMenuInflater()); 264 if (android.os.Build.VERSION.SDK_INT >= HONEYCOMB) { 265 return show; 266 } 267 // Prior to Honeycomb, the framework can't invalidate the options 268 // menu, so we must always say we have one in case the app later 269 // invalidates it and needs to have it shown. 270 return true; 271 } 272 return super.onCreatePanelMenu(featureId, menu); 273 } 274 275 @Override 276 final View dispatchFragmentsOnCreateView(View parent, String name, Context context, 277 AttributeSet attrs) { 278 return mFragments.onCreateView(parent, name, context, attrs); 279 } 280 281 /** 282 * Destroy all fragments and loaders. 283 */ 284 @Override 285 protected void onDestroy() { 286 super.onDestroy(); 287 288 doReallyStop(false); 289 290 mFragments.dispatchDestroy(); 291 mFragments.doLoaderDestroy(); 292 } 293 294 /** 295 * Take care of calling onBackPressed() for pre-Eclair platforms. 296 */ 297 @Override 298 public boolean onKeyDown(int keyCode, KeyEvent event) { 299 if (android.os.Build.VERSION.SDK_INT < 5 /* ECLAIR */ 300 && keyCode == KeyEvent.KEYCODE_BACK 301 && event.getRepeatCount() == 0) { 302 // Take care of calling this method on earlier versions of 303 // the platform where it doesn't exist. 304 onBackPressed(); 305 return true; 306 } 307 308 return super.onKeyDown(keyCode, event); 309 } 310 311 /** 312 * Dispatch onLowMemory() to all fragments. 313 */ 314 @Override 315 public void onLowMemory() { 316 super.onLowMemory(); 317 mFragments.dispatchLowMemory(); 318 } 319 320 /** 321 * Dispatch context and options menu to fragments. 322 */ 323 @Override 324 public boolean onMenuItemSelected(int featureId, MenuItem item) { 325 if (super.onMenuItemSelected(featureId, item)) { 326 return true; 327 } 328 329 switch (featureId) { 330 case Window.FEATURE_OPTIONS_PANEL: 331 return mFragments.dispatchOptionsItemSelected(item); 332 333 case Window.FEATURE_CONTEXT_MENU: 334 return mFragments.dispatchContextItemSelected(item); 335 336 default: 337 return false; 338 } 339 } 340 341 /** 342 * Call onOptionsMenuClosed() on fragments. 343 */ 344 @Override 345 public void onPanelClosed(int featureId, Menu menu) { 346 switch (featureId) { 347 case Window.FEATURE_OPTIONS_PANEL: 348 mFragments.dispatchOptionsMenuClosed(menu); 349 break; 350 } 351 super.onPanelClosed(featureId, menu); 352 } 353 354 /** 355 * Dispatch onPause() to fragments. 356 */ 357 @Override 358 protected void onPause() { 359 super.onPause(); 360 mResumed = false; 361 if (mHandler.hasMessages(MSG_RESUME_PENDING)) { 362 mHandler.removeMessages(MSG_RESUME_PENDING); 363 onResumeFragments(); 364 } 365 mFragments.dispatchPause(); 366 } 367 368 /** 369 * Handle onNewIntent() to inform the fragment manager that the 370 * state is not saved. If you are handling new intents and may be 371 * making changes to the fragment state, you want to be sure to call 372 * through to the super-class here first. Otherwise, if your state 373 * is saved but the activity is not stopped, you could get an 374 * onNewIntent() call which happens before onResume() and trying to 375 * perform fragment operations at that point will throw IllegalStateException 376 * because the fragment manager thinks the state is still saved. 377 */ 378 @Override 379 protected void onNewIntent(Intent intent) { 380 super.onNewIntent(intent); 381 mFragments.noteStateNotSaved(); 382 } 383 384 /** 385 * Dispatch onResume() to fragments. Note that for better inter-operation 386 * with older versions of the platform, at the point of this call the 387 * fragments attached to the activity are <em>not</em> resumed. This means 388 * that in some cases the previous state may still be saved, not allowing 389 * fragment transactions that modify the state. To correctly interact 390 * with fragments in their proper state, you should instead override 391 * {@link #onResumeFragments()}. 392 */ 393 @Override 394 protected void onResume() { 395 super.onResume(); 396 mHandler.sendEmptyMessage(MSG_RESUME_PENDING); 397 mResumed = true; 398 mFragments.execPendingActions(); 399 } 400 401 /** 402 * Dispatch onResume() to fragments. 403 */ 404 @Override 405 protected void onPostResume() { 406 super.onPostResume(); 407 mHandler.removeMessages(MSG_RESUME_PENDING); 408 onResumeFragments(); 409 mFragments.execPendingActions(); 410 } 411 412 /** 413 * This is the fragment-orientated version of {@link #onResume()} that you 414 * can override to perform operations in the Activity at the same point 415 * where its fragments are resumed. Be sure to always call through to 416 * the super-class. 417 */ 418 protected void onResumeFragments() { 419 mFragments.dispatchResume(); 420 } 421 422 /** 423 * Dispatch onPrepareOptionsMenu() to fragments. 424 */ 425 @Override 426 public boolean onPreparePanel(int featureId, View view, Menu menu) { 427 if (featureId == Window.FEATURE_OPTIONS_PANEL && menu != null) { 428 if (mOptionsMenuInvalidated) { 429 mOptionsMenuInvalidated = false; 430 menu.clear(); 431 onCreatePanelMenu(featureId, menu); 432 } 433 boolean goforit = onPrepareOptionsPanel(view, menu); 434 goforit |= mFragments.dispatchPrepareOptionsMenu(menu); 435 return goforit; 436 } 437 return super.onPreparePanel(featureId, view, menu); 438 } 439 440 /** 441 * @hide 442 */ 443 protected boolean onPrepareOptionsPanel(View view, Menu menu) { 444 return super.onPreparePanel(Window.FEATURE_OPTIONS_PANEL, view, menu); 445 } 446 447 /** 448 * Retain all appropriate fragment and loader state. You can NOT 449 * override this yourself! Use {@link #onRetainCustomNonConfigurationInstance()} 450 * if you want to retain your own state. 451 */ 452 @Override 453 public final Object onRetainNonConfigurationInstance() { 454 if (mStopped) { 455 doReallyStop(true); 456 } 457 458 Object custom = onRetainCustomNonConfigurationInstance(); 459 460 List<Fragment> fragments = mFragments.retainNonConfig(); 461 SimpleArrayMap<String, LoaderManager> loaders = mFragments.retainLoaderNonConfig(); 462 463 if (fragments == null && loaders == null && custom == null) { 464 return null; 465 } 466 467 NonConfigurationInstances nci = new NonConfigurationInstances(); 468 nci.custom = custom; 469 nci.fragments = fragments; 470 nci.loaders = loaders; 471 return nci; 472 } 473 474 /** 475 * Save all appropriate fragment state. 476 */ 477 @Override 478 protected void onSaveInstanceState(Bundle outState) { 479 super.onSaveInstanceState(outState); 480 Parcelable p = mFragments.saveAllState(); 481 if (p != null) { 482 outState.putParcelable(FRAGMENTS_TAG, p); 483 } 484 } 485 486 /** 487 * Dispatch onStart() to all fragments. Ensure any created loaders are 488 * now started. 489 */ 490 @Override 491 protected void onStart() { 492 super.onStart(); 493 494 mStopped = false; 495 mReallyStopped = false; 496 mHandler.removeMessages(MSG_REALLY_STOPPED); 497 498 if (!mCreated) { 499 mCreated = true; 500 mFragments.dispatchActivityCreated(); 501 } 502 503 mFragments.noteStateNotSaved(); 504 mFragments.execPendingActions(); 505 506 mFragments.doLoaderStart(); 507 508 // NOTE: HC onStart goes here. 509 510 mFragments.dispatchStart(); 511 mFragments.reportLoaderStart(); 512 } 513 514 /** 515 * Dispatch onStop() to all fragments. Ensure all loaders are stopped. 516 */ 517 @Override 518 protected void onStop() { 519 super.onStop(); 520 521 mStopped = true; 522 mHandler.sendEmptyMessage(MSG_REALLY_STOPPED); 523 524 mFragments.dispatchStop(); 525 } 526 527 // ------------------------------------------------------------------------ 528 // NEW METHODS 529 // ------------------------------------------------------------------------ 530 531 /** 532 * Use this instead of {@link #onRetainNonConfigurationInstance()}. 533 * Retrieve later with {@link #getLastCustomNonConfigurationInstance()}. 534 */ 535 public Object onRetainCustomNonConfigurationInstance() { 536 return null; 537 } 538 539 /** 540 * Return the value previously returned from 541 * {@link #onRetainCustomNonConfigurationInstance()}. 542 */ 543 @SuppressWarnings("deprecation") 544 public Object getLastCustomNonConfigurationInstance() { 545 NonConfigurationInstances nc = (NonConfigurationInstances) 546 getLastNonConfigurationInstance(); 547 return nc != null ? nc.custom : null; 548 } 549 550 /** 551 * Support library version of {@link Activity#invalidateOptionsMenu}. 552 * 553 * <p>Invalidate the activity's options menu. This will cause relevant presentations 554 * of the menu to fully update via calls to onCreateOptionsMenu and 555 * onPrepareOptionsMenu the next time the menu is requested. 556 */ 557 public void supportInvalidateOptionsMenu() { 558 if (android.os.Build.VERSION.SDK_INT >= HONEYCOMB) { 559 // If we are running on HC or greater, we can use the framework 560 // API to invalidate the options menu. 561 ActivityCompatHoneycomb.invalidateOptionsMenu(this); 562 return; 563 } 564 565 // Whoops, older platform... we'll use a hack, to manually rebuild 566 // the options menu the next time it is prepared. 567 mOptionsMenuInvalidated = true; 568 } 569 570 /** 571 * Print the Activity's state into the given stream. This gets invoked if 572 * you run "adb shell dumpsys activity <activity_component_name>". 573 * 574 * @param prefix Desired prefix to prepend at each line of output. 575 * @param fd The raw file descriptor that the dump is being sent to. 576 * @param writer The PrintWriter to which you should dump your state. This will be 577 * closed for you after you return. 578 * @param args additional arguments to the dump request. 579 */ 580 public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) { 581 if (android.os.Build.VERSION.SDK_INT >= HONEYCOMB) { 582 // XXX This can only work if we can call the super-class impl. :/ 583 //ActivityCompatHoneycomb.dump(this, prefix, fd, writer, args); 584 } 585 writer.print(prefix); writer.print("Local FragmentActivity "); 586 writer.print(Integer.toHexString(System.identityHashCode(this))); 587 writer.println(" State:"); 588 String innerPrefix = prefix + " "; 589 writer.print(innerPrefix); writer.print("mCreated="); 590 writer.print(mCreated); writer.print("mResumed="); 591 writer.print(mResumed); writer.print(" mStopped="); 592 writer.print(mStopped); writer.print(" mReallyStopped="); 593 writer.println(mReallyStopped); 594 mFragments.dumpLoaders(innerPrefix, fd, writer, args); 595 mFragments.getSupportFragmentManager().dump(prefix, fd, writer, args); 596 writer.print(prefix); writer.println("View Hierarchy:"); 597 dumpViewHierarchy(prefix + " ", writer, getWindow().getDecorView()); 598 } 599 600 private static String viewToString(View view) { 601 StringBuilder out = new StringBuilder(128); 602 out.append(view.getClass().getName()); 603 out.append('{'); 604 out.append(Integer.toHexString(System.identityHashCode(view))); 605 out.append(' '); 606 switch (view.getVisibility()) { 607 case View.VISIBLE: out.append('V'); break; 608 case View.INVISIBLE: out.append('I'); break; 609 case View.GONE: out.append('G'); break; 610 default: out.append('.'); break; 611 } 612 out.append(view.isFocusable() ? 'F' : '.'); 613 out.append(view.isEnabled() ? 'E' : '.'); 614 out.append(view.willNotDraw() ? '.' : 'D'); 615 out.append(view.isHorizontalScrollBarEnabled()? 'H' : '.'); 616 out.append(view.isVerticalScrollBarEnabled() ? 'V' : '.'); 617 out.append(view.isClickable() ? 'C' : '.'); 618 out.append(view.isLongClickable() ? 'L' : '.'); 619 out.append(' '); 620 out.append(view.isFocused() ? 'F' : '.'); 621 out.append(view.isSelected() ? 'S' : '.'); 622 out.append(view.isPressed() ? 'P' : '.'); 623 out.append(' '); 624 out.append(view.getLeft()); 625 out.append(','); 626 out.append(view.getTop()); 627 out.append('-'); 628 out.append(view.getRight()); 629 out.append(','); 630 out.append(view.getBottom()); 631 final int id = view.getId(); 632 if (id != View.NO_ID) { 633 out.append(" #"); 634 out.append(Integer.toHexString(id)); 635 final Resources r = view.getResources(); 636 if (id != 0 && r != null) { 637 try { 638 String pkgname; 639 switch (id&0xff000000) { 640 case 0x7f000000: 641 pkgname="app"; 642 break; 643 case 0x01000000: 644 pkgname="android"; 645 break; 646 default: 647 pkgname = r.getResourcePackageName(id); 648 break; 649 } 650 String typename = r.getResourceTypeName(id); 651 String entryname = r.getResourceEntryName(id); 652 out.append(" "); 653 out.append(pkgname); 654 out.append(":"); 655 out.append(typename); 656 out.append("/"); 657 out.append(entryname); 658 } catch (Resources.NotFoundException e) { 659 } 660 } 661 } 662 out.append("}"); 663 return out.toString(); 664 } 665 666 private void dumpViewHierarchy(String prefix, PrintWriter writer, View view) { 667 writer.print(prefix); 668 if (view == null) { 669 writer.println("null"); 670 return; 671 } 672 writer.println(viewToString(view)); 673 if (!(view instanceof ViewGroup)) { 674 return; 675 } 676 ViewGroup grp = (ViewGroup)view; 677 final int N = grp.getChildCount(); 678 if (N <= 0) { 679 return; 680 } 681 prefix = prefix + " "; 682 for (int i=0; i<N; i++) { 683 dumpViewHierarchy(prefix, writer, grp.getChildAt(i)); 684 } 685 } 686 687 void doReallyStop(boolean retaining) { 688 if (!mReallyStopped) { 689 mReallyStopped = true; 690 mRetaining = retaining; 691 mHandler.removeMessages(MSG_REALLY_STOPPED); 692 onReallyStop(); 693 } 694 } 695 696 /** 697 * Pre-HC, we didn't have a way to determine whether an activity was 698 * being stopped for a config change or not until we saw 699 * onRetainNonConfigurationInstance() called after onStop(). However 700 * we need to know this, to know whether to retain fragments. This will 701 * tell us what we need to know. 702 */ 703 void onReallyStop() { 704 mFragments.doLoaderStop(mRetaining); 705 706 mFragments.dispatchReallyStop(); 707 } 708 709 // ------------------------------------------------------------------------ 710 // FRAGMENT SUPPORT 711 // ------------------------------------------------------------------------ 712 713 /** 714 * Called when a fragment is attached to the activity. 715 */ 716 @SuppressWarnings("unused") 717 public void onAttachFragment(Fragment fragment) { 718 } 719 720 /** 721 * Return the FragmentManager for interacting with fragments associated 722 * with this activity. 723 */ 724 public FragmentManager getSupportFragmentManager() { 725 return mFragments.getSupportFragmentManager(); 726 } 727 728 public LoaderManager getSupportLoaderManager() { 729 return mFragments.getSupportLoaderManager(); 730 } 731 732 /** 733 * Modifies the standard behavior to allow results to be delivered to fragments. 734 * This imposes a restriction that requestCode be <= 0xffff. 735 */ 736 @Override 737 public void startActivityForResult(Intent intent, int requestCode) { 738 if (requestCode != -1 && (requestCode&0xffff0000) != 0) { 739 throw new IllegalArgumentException("Can only use lower 16 bits for requestCode"); 740 } 741 super.startActivityForResult(intent, requestCode); 742 } 743 744 @Override 745 public final void validateRequestPermissionsRequestCode(int requestCode) { 746 // We use 8 bits of the request code to encode the fragment id when 747 // requesting permissions from a fragment. Hence, requestPermissions() 748 // should validate the code against that but we cannot override it as 749 // we can not then call super and also the ActivityCompat would call 750 // back to this override. To handle this we use dependency inversion 751 // where we are the validator of request codes when requesting 752 // permissions in ActivityCompat. 753 if (mRequestedPermissionsFromFragment) { 754 mRequestedPermissionsFromFragment = false; 755 } else if ((requestCode & 0xffffff00) != 0) { 756 throw new IllegalArgumentException("Can only use lower 8 bits for requestCode"); 757 } 758 } 759 760 /** 761 * Callback for the result from requesting permissions. This method 762 * is invoked for every call on {@link #requestPermissions(String[], int)}. 763 * 764 * @param requestCode The request code passed in {@link #requestPermissions(String[], int)}. 765 * @param permissions The requested permissions. Never null. 766 * @param grantResults The grant results for the corresponding permissions 767 * which is either {@link android.content.pm.PackageManager#PERMISSION_GRANTED} 768 * or {@link android.content.pm.PackageManager#PERMISSION_DENIED}. Never null. 769 * 770 * @see #requestPermissions(String[], int) 771 */ 772 public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, 773 @NonNull int[] grantResults) { 774 int index = (requestCode>>8)&0xff; 775 if (index != 0) { 776 index--; 777 final int activeFragmentsCount = mFragments.getActiveFragmentsCount(); 778 if (activeFragmentsCount == 0 || index < 0 || index >= activeFragmentsCount) { 779 Log.w(TAG, "Activity result fragment index out of range: 0x" 780 + Integer.toHexString(requestCode)); 781 return; 782 } 783 final List<Fragment> activeFragments = 784 mFragments.getActiveFragments(new ArrayList<Fragment>(activeFragmentsCount)); 785 Fragment frag = activeFragments.get(index); 786 if (frag == null) { 787 Log.w(TAG, "Activity result no fragment exists for index: 0x" 788 + Integer.toHexString(requestCode)); 789 } else { 790 frag.onRequestPermissionsResult(requestCode&0xff, permissions, grantResults); 791 } 792 } 793 } 794 795 /** 796 * Called by Fragment.startActivityForResult() to implement its behavior. 797 */ 798 public void startActivityFromFragment(Fragment fragment, Intent intent, 799 int requestCode) { 800 if (requestCode == -1) { 801 super.startActivityForResult(intent, -1); 802 return; 803 } 804 if ((requestCode&0xffff0000) != 0) { 805 throw new IllegalArgumentException("Can only use lower 16 bits for requestCode"); 806 } 807 super.startActivityForResult(intent, ((fragment.mIndex+1)<<16) + (requestCode&0xffff)); 808 } 809 810 /** 811 * Called by Fragment.requestPermissions() to implement its behavior. 812 */ 813 private void requestPermissionsFromFragment(Fragment fragment, String[] permissions, 814 int requestCode) { 815 if (requestCode == -1) { 816 ActivityCompat.requestPermissions(this, permissions, requestCode); 817 return; 818 } 819 if ((requestCode&0xffffff00) != 0) { 820 throw new IllegalArgumentException("Can only use lower 8 bits for requestCode"); 821 } 822 mRequestedPermissionsFromFragment = true; 823 ActivityCompat.requestPermissions(this, permissions, 824 ((fragment.mIndex + 1) << 8) + (requestCode & 0xff)); 825 } 826 827 class HostCallbacks extends FragmentHostCallback<FragmentActivity> { 828 public HostCallbacks() { 829 super(FragmentActivity.this /*fragmentActivity*/); 830 } 831 832 @Override 833 public void onDump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) { 834 FragmentActivity.this.dump(prefix, fd, writer, args); 835 } 836 837 @Override 838 public boolean onShouldSaveFragmentState(Fragment fragment) { 839 return !isFinishing(); 840 } 841 842 @Override 843 public LayoutInflater onGetLayoutInflater() { 844 return FragmentActivity.this.getLayoutInflater().cloneInContext(FragmentActivity.this); 845 } 846 847 @Override 848 public FragmentActivity onGetHost() { 849 return FragmentActivity.this; 850 } 851 852 @Override 853 public void onSupportInvalidateOptionsMenu() { 854 FragmentActivity.this.supportInvalidateOptionsMenu(); 855 } 856 857 @Override 858 public void onStartActivityFromFragment(Fragment fragment, Intent intent, int requestCode) { 859 FragmentActivity.this.startActivityFromFragment(fragment, intent, requestCode); 860 } 861 862 @Override 863 public void onRequestPermissionsFromFragment(@NonNull Fragment fragment, 864 @NonNull String[] permissions, int requestCode) { 865 FragmentActivity.this.requestPermissionsFromFragment(fragment, permissions, 866 requestCode); 867 } 868 869 @Override 870 public boolean onShouldShowRequestPermissionRationale(@NonNull String permission) { 871 return ActivityCompat.shouldShowRequestPermissionRationale( 872 FragmentActivity.this, permission); 873 } 874 875 @Override 876 public boolean onHasWindowAnimations() { 877 return getWindow() != null; 878 } 879 880 @Override 881 public int onGetWindowAnimations() { 882 final Window w = getWindow(); 883 return (w == null) ? 0 : w.getAttributes().windowAnimations; 884 } 885 886 @Override 887 public void onAttachFragment(Fragment fragment) { 888 FragmentActivity.this.onAttachFragment(fragment); 889 } 890 891 @Nullable 892 @Override 893 public View onFindViewById(int id) { 894 return FragmentActivity.this.findViewById(id); 895 } 896 897 @Override 898 public boolean onHasView() { 899 final Window w = getWindow(); 900 return (w != null && w.peekDecorView() != null); 901 } 902 } 903} 904