RecentsView.java revision 8aa7d161a11965cd75eace74e1bcf15421bbea18
1/* 2 * Copyright (C) 2014 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 com.android.systemui.recents.views; 18 19import android.app.ActivityOptions; 20import android.app.TaskStackBuilder; 21import android.content.Context; 22import android.content.Intent; 23import android.graphics.Bitmap; 24import android.graphics.Canvas; 25import android.graphics.Rect; 26import android.net.Uri; 27import android.os.UserHandle; 28import android.provider.Settings; 29import android.util.AttributeSet; 30import android.view.LayoutInflater; 31import android.view.View; 32import android.view.ViewStub; 33import android.view.WindowInsets; 34import android.widget.FrameLayout; 35import com.android.systemui.R; 36import com.android.systemui.recents.Constants; 37import com.android.systemui.recents.RecentsConfiguration; 38import com.android.systemui.recents.misc.SystemServicesProxy; 39import com.android.systemui.recents.model.RecentsPackageMonitor; 40import com.android.systemui.recents.model.RecentsTaskLoader; 41import com.android.systemui.recents.model.Task; 42import com.android.systemui.recents.model.TaskStack; 43 44import java.util.ArrayList; 45import java.util.List; 46 47/** 48 * This view is the the top level layout that contains TaskStacks (which are laid out according 49 * to their SpaceNode bounds. 50 */ 51public class RecentsView extends FrameLayout implements TaskStackView.TaskStackViewCallbacks, 52 RecentsPackageMonitor.PackageCallbacks { 53 54 /** The RecentsView callbacks */ 55 public interface RecentsViewCallbacks { 56 public void onTaskViewClicked(); 57 public void onTaskLaunchFailed(); 58 public void onAllTaskViewsDismissed(); 59 public void onExitToHomeAnimationTriggered(); 60 public void onScreenPinningRequest(); 61 62 public void onTaskResize(Task t); 63 } 64 65 RecentsConfiguration mConfig; 66 LayoutInflater mInflater; 67 DebugOverlayView mDebugOverlay; 68 RecentsViewLayoutAlgorithm mLayoutAlgorithm; 69 70 ArrayList<TaskStack> mStacks; 71 List<TaskStackView> mTaskStackViews = new ArrayList<>(); 72 View mSearchBar; 73 RecentsViewCallbacks mCb; 74 75 public RecentsView(Context context) { 76 super(context); 77 } 78 79 public RecentsView(Context context, AttributeSet attrs) { 80 this(context, attrs, 0); 81 } 82 83 public RecentsView(Context context, AttributeSet attrs, int defStyleAttr) { 84 this(context, attrs, defStyleAttr, 0); 85 } 86 87 public RecentsView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 88 super(context, attrs, defStyleAttr, defStyleRes); 89 mConfig = RecentsConfiguration.getInstance(); 90 mInflater = LayoutInflater.from(context); 91 mLayoutAlgorithm = new RecentsViewLayoutAlgorithm(mConfig); 92 } 93 94 /** Sets the callbacks */ 95 public void setCallbacks(RecentsViewCallbacks cb) { 96 mCb = cb; 97 } 98 99 /** Sets the debug overlay */ 100 public void setDebugOverlay(DebugOverlayView overlay) { 101 mDebugOverlay = overlay; 102 } 103 104 /** Set/get the bsp root node */ 105 public void setTaskStacks(ArrayList<TaskStack> stacks) { 106 int numStacks = stacks.size(); 107 108 // Remove all/extra stack views 109 int numTaskStacksToKeep = 0; // Keep no tasks if we are recreating the layout 110 if (mConfig.launchedReuseTaskStackViews) { 111 numTaskStacksToKeep = Math.min(mTaskStackViews.size(), numStacks); 112 } 113 for (int i = mTaskStackViews.size() - 1; i >= numTaskStacksToKeep; i--) { 114 removeView(mTaskStackViews.remove(i)); 115 } 116 117 // Update the stack views that we are keeping 118 for (int i = 0; i < numTaskStacksToKeep; i++) { 119 TaskStackView tsv = mTaskStackViews.get(i); 120 // If onRecentsHidden is not triggered, we need to the stack view again here 121 tsv.reset(); 122 tsv.setStack(stacks.get(i)); 123 } 124 125 // Add remaining/recreate stack views 126 mStacks = stacks; 127 for (int i = mTaskStackViews.size(); i < numStacks; i++) { 128 TaskStack stack = stacks.get(i); 129 TaskStackView stackView = new TaskStackView(getContext(), stack); 130 stackView.setCallbacks(this); 131 addView(stackView); 132 mTaskStackViews.add(stackView); 133 } 134 135 // Enable debug mode drawing on all the stacks if necessary 136 if (mConfig.debugModeEnabled) { 137 for (int i = mTaskStackViews.size() - 1; i >= 0; i--) { 138 TaskStackView stackView = mTaskStackViews.get(i); 139 stackView.setDebugOverlay(mDebugOverlay); 140 } 141 } 142 143 // Trigger a new layout 144 requestLayout(); 145 } 146 147 /** Gets the list of task views */ 148 List<TaskStackView> getTaskStackViews() { 149 return mTaskStackViews; 150 } 151 152 /** Gets the next task in the stack - or if the last - the top task */ 153 public Task getNextTaskOrTopTask(Task taskToSearch) { 154 Task returnTask = null; 155 boolean found = false; 156 List<TaskStackView> stackViews = getTaskStackViews(); 157 int stackCount = stackViews.size(); 158 for (int i = stackCount - 1; i >= 0; --i) { 159 TaskStack stack = stackViews.get(i).getStack(); 160 ArrayList<Task> taskList = stack.getTasks(); 161 // Iterate the stack views and try and find the focused task 162 for (int j = taskList.size() - 1; j >= 0; --j) { 163 Task task = taskList.get(j); 164 // Return the next task in the line. 165 if (found) 166 return task; 167 // Remember the first possible task as the top task. 168 if (returnTask == null) 169 returnTask = task; 170 if (task == taskToSearch) 171 found = true; 172 } 173 } 174 return returnTask; 175 } 176 177 /** Launches the focused task from the first stack if possible */ 178 public boolean launchFocusedTask() { 179 // Get the first stack view 180 List<TaskStackView> stackViews = getTaskStackViews(); 181 int stackCount = stackViews.size(); 182 for (int i = 0; i < stackCount; i++) { 183 TaskStackView stackView = stackViews.get(i); 184 TaskStack stack = stackView.getStack(); 185 // Iterate the stack views and try and find the focused task 186 List<TaskView> taskViews = stackView.getTaskViews(); 187 int taskViewCount = taskViews.size(); 188 for (int j = 0; j < taskViewCount; j++) { 189 TaskView tv = taskViews.get(j); 190 Task task = tv.getTask(); 191 if (tv.isFocusedTask()) { 192 onTaskViewClicked(stackView, tv, stack, task, false); 193 return true; 194 } 195 } 196 } 197 return false; 198 } 199 200 /** Launches a given task. */ 201 public boolean launchTask(Task task) { 202 // Get the first stack view 203 List<TaskStackView> stackViews = getTaskStackViews(); 204 int stackCount = stackViews.size(); 205 for (int i = 0; i < stackCount; i++) { 206 TaskStackView stackView = stackViews.get(i); 207 TaskStack stack = stackView.getStack(); 208 // Iterate the stack views and try and find the given task. 209 List<TaskView> taskViews = stackView.getTaskViews(); 210 int taskViewCount = taskViews.size(); 211 for (int j = 0; j < taskViewCount; j++) { 212 TaskView tv = taskViews.get(j); 213 if (tv.getTask() == task) { 214 onTaskViewClicked(stackView, tv, stack, task, false); 215 return true; 216 } 217 } 218 } 219 return false; 220 } 221 222 /** Launches the task that Recents was launched from, if possible */ 223 public boolean launchPreviousTask() { 224 // Get the first stack view 225 List<TaskStackView> stackViews = getTaskStackViews(); 226 int stackCount = stackViews.size(); 227 for (int i = 0; i < stackCount; i++) { 228 TaskStackView stackView = stackViews.get(i); 229 TaskStack stack = stackView.getStack(); 230 ArrayList<Task> tasks = stack.getTasks(); 231 232 // Find the launch task in the stack 233 if (!tasks.isEmpty()) { 234 int taskCount = tasks.size(); 235 for (int j = 0; j < taskCount; j++) { 236 if (tasks.get(j).isLaunchTarget) { 237 Task task = tasks.get(j); 238 TaskView tv = stackView.getChildViewForTask(task); 239 onTaskViewClicked(stackView, tv, stack, task, false); 240 return true; 241 } 242 } 243 } 244 } 245 return false; 246 } 247 248 /** Requests all task stacks to start their enter-recents animation */ 249 public void startEnterRecentsAnimation(ViewAnimation.TaskViewEnterContext ctx) { 250 // We have to increment/decrement the post animation trigger in case there are no children 251 // to ensure that it runs 252 ctx.postAnimationTrigger.increment(); 253 254 List<TaskStackView> stackViews = getTaskStackViews(); 255 int stackCount = stackViews.size(); 256 for (int i = 0; i < stackCount; i++) { 257 TaskStackView stackView = stackViews.get(i); 258 stackView.startEnterRecentsAnimation(ctx); 259 } 260 ctx.postAnimationTrigger.decrement(); 261 } 262 263 /** Requests all task stacks to start their exit-recents animation */ 264 public void startExitToHomeAnimation(ViewAnimation.TaskViewExitContext ctx) { 265 // We have to increment/decrement the post animation trigger in case there are no children 266 // to ensure that it runs 267 ctx.postAnimationTrigger.increment(); 268 List<TaskStackView> stackViews = getTaskStackViews(); 269 int stackCount = stackViews.size(); 270 for (int i = 0; i < stackCount; i++) { 271 TaskStackView stackView = stackViews.get(i); 272 stackView.startExitToHomeAnimation(ctx); 273 } 274 ctx.postAnimationTrigger.decrement(); 275 276 // Notify of the exit animation 277 mCb.onExitToHomeAnimationTriggered(); 278 } 279 280 /** Adds the search bar */ 281 public void setSearchBar(View searchBar) { 282 // Create the search bar (and hide it if we have no recent tasks) 283 if (Constants.DebugFlags.App.EnableSearchLayout) { 284 // Remove the previous search bar if one exists 285 if (mSearchBar != null && indexOfChild(mSearchBar) > -1) { 286 removeView(mSearchBar); 287 } 288 // Add the new search bar 289 if (searchBar != null) { 290 mSearchBar = searchBar; 291 addView(mSearchBar); 292 } 293 } 294 } 295 296 /** Returns whether there is currently a search bar */ 297 public boolean hasSearchBar() { 298 return mSearchBar != null; 299 } 300 301 /** Sets the visibility of the search bar */ 302 public void setSearchBarVisibility(int visibility) { 303 if (mSearchBar != null) { 304 mSearchBar.setVisibility(visibility); 305 // Always bring the search bar to the top 306 mSearchBar.bringToFront(); 307 } 308 } 309 310 /** 311 * This is called with the full size of the window since we are handling our own insets. 312 */ 313 @Override 314 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 315 int width = MeasureSpec.getSize(widthMeasureSpec); 316 int height = MeasureSpec.getSize(heightMeasureSpec); 317 318 // Get the search bar bounds and measure the search bar layout 319 if (mSearchBar != null) { 320 Rect searchBarSpaceBounds = new Rect(); 321 mConfig.getSearchBarBounds(width, height, mConfig.systemInsets.top, searchBarSpaceBounds); 322 mSearchBar.measure( 323 MeasureSpec.makeMeasureSpec(searchBarSpaceBounds.width(), MeasureSpec.EXACTLY), 324 MeasureSpec.makeMeasureSpec(searchBarSpaceBounds.height(), MeasureSpec.EXACTLY)); 325 } 326 327 Rect taskStackBounds = new Rect(); 328 mConfig.getAvailableTaskStackBounds(width, height, mConfig.systemInsets.top, 329 mConfig.systemInsets.right, taskStackBounds); 330 331 // Measure each TaskStackView with the full width and height of the window since the 332 // transition view is a child of that stack view 333 List<TaskStackView> stackViews = getTaskStackViews(); 334 List<Rect> stackViewsBounds = mLayoutAlgorithm.computeStackRects(stackViews, 335 taskStackBounds); 336 int stackCount = stackViews.size(); 337 for (int i = 0; i < stackCount; i++) { 338 TaskStackView stackView = stackViews.get(i); 339 if (stackView.getVisibility() != GONE) { 340 // We are going to measure the TaskStackView with the whole RecentsView dimensions, 341 // but the actual stack is going to be inset to the bounds calculated by the layout 342 // algorithm 343 stackView.setStackInsetRect(stackViewsBounds.get(i)); 344 stackView.measure(widthMeasureSpec, heightMeasureSpec); 345 } 346 } 347 348 setMeasuredDimension(width, height); 349 } 350 351 /** 352 * This is called with the full size of the window since we are handling our own insets. 353 */ 354 @Override 355 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 356 // Get the search bar bounds so that we lay it out 357 if (mSearchBar != null) { 358 Rect searchBarSpaceBounds = new Rect(); 359 mConfig.getSearchBarBounds(getMeasuredWidth(), getMeasuredHeight(), 360 mConfig.systemInsets.top, searchBarSpaceBounds); 361 mSearchBar.layout(searchBarSpaceBounds.left, searchBarSpaceBounds.top, 362 searchBarSpaceBounds.right, searchBarSpaceBounds.bottom); 363 } 364 365 // Layout each TaskStackView with the full width and height of the window since the 366 // transition view is a child of that stack view 367 List<TaskStackView> stackViews = getTaskStackViews(); 368 int stackCount = stackViews.size(); 369 for (int i = 0; i < stackCount; i++) { 370 TaskStackView stackView = stackViews.get(i); 371 if (stackView.getVisibility() != GONE) { 372 stackView.layout(left, top, left + stackView.getMeasuredWidth(), 373 top + stackView.getMeasuredHeight()); 374 } 375 } 376 } 377 378 @Override 379 public WindowInsets onApplyWindowInsets(WindowInsets insets) { 380 // Update the configuration with the latest system insets and trigger a relayout 381 mConfig.updateSystemInsets(insets.getSystemWindowInsets()); 382 requestLayout(); 383 return insets.consumeSystemWindowInsets(); 384 } 385 386 /** Notifies each task view of the user interaction. */ 387 public void onUserInteraction() { 388 // Get the first stack view 389 List<TaskStackView> stackViews = getTaskStackViews(); 390 int stackCount = stackViews.size(); 391 for (int i = 0; i < stackCount; i++) { 392 TaskStackView stackView = stackViews.get(i); 393 stackView.onUserInteraction(); 394 } 395 } 396 397 /** Focuses the next task in the first stack view */ 398 public void focusNextTask(boolean forward) { 399 // Get the first stack view 400 List<TaskStackView> stackViews = getTaskStackViews(); 401 if (!stackViews.isEmpty()) { 402 stackViews.get(0).focusNextTask(forward, true); 403 } 404 } 405 406 /** Dismisses the focused task. */ 407 public void dismissFocusedTask() { 408 // Get the first stack view 409 List<TaskStackView> stackViews = getTaskStackViews(); 410 if (!stackViews.isEmpty()) { 411 stackViews.get(0).dismissFocusedTask(); 412 } 413 } 414 415 /** Unfilters any filtered stacks */ 416 public boolean unfilterFilteredStacks() { 417 if (mStacks != null) { 418 // Check if there are any filtered stacks and unfilter them before we back out of Recents 419 boolean stacksUnfiltered = false; 420 int numStacks = mStacks.size(); 421 for (int i = 0; i < numStacks; i++) { 422 TaskStack stack = mStacks.get(i); 423 if (stack.hasFilteredTasks()) { 424 stack.unfilterTasks(); 425 stacksUnfiltered = true; 426 } 427 } 428 return stacksUnfiltered; 429 } 430 return false; 431 } 432 433 /**** TaskStackView.TaskStackCallbacks Implementation ****/ 434 435 @Override 436 public void onTaskViewClicked(final TaskStackView stackView, final TaskView tv, 437 final TaskStack stack, final Task task, final boolean lockToTask) { 438 // Notify any callbacks of the launching of a new task 439 if (mCb != null) { 440 mCb.onTaskViewClicked(); 441 } 442 443 // Upfront the processing of the thumbnail 444 TaskViewTransform transform = new TaskViewTransform(); 445 View sourceView; 446 int offsetX = 0; 447 int offsetY = 0; 448 float stackScroll = stackView.getScroller().getStackScroll(); 449 if (tv == null) { 450 // If there is no actual task view, then use the stack view as the source view 451 // and then offset to the expected transform rect, but bound this to just 452 // outside the display rect (to ensure we don't animate from too far away) 453 sourceView = stackView; 454 transform = stackView.getStackAlgorithm().getStackTransform(task, stackScroll, transform, null); 455 offsetX = transform.rect.left; 456 offsetY = mConfig.displayRect.height(); 457 } else { 458 sourceView = tv.mThumbnailView; 459 transform = stackView.getStackAlgorithm().getStackTransform(task, stackScroll, transform, null); 460 } 461 462 // Compute the thumbnail to scale up from 463 final SystemServicesProxy ssp = 464 RecentsTaskLoader.getInstance().getSystemServicesProxy(); 465 ActivityOptions opts = null; 466 if (task.thumbnail != null && task.thumbnail.getWidth() > 0 && 467 task.thumbnail.getHeight() > 0) { 468 Bitmap b; 469 if (tv != null) { 470 // Disable any focused state before we draw the header 471 if (tv.isFocusedTask()) { 472 tv.unsetFocusedTask(); 473 } 474 475 float scale = tv.getScaleX(); 476 int fromHeaderWidth = (int) (tv.mHeaderView.getMeasuredWidth() * scale); 477 int fromHeaderHeight = (int) (tv.mHeaderView.getMeasuredHeight() * scale); 478 b = Bitmap.createBitmap(fromHeaderWidth, fromHeaderHeight, 479 Bitmap.Config.ARGB_8888); 480 if (Constants.DebugFlags.App.EnableTransitionThumbnailDebugMode) { 481 b.eraseColor(0xFFff0000); 482 } else { 483 Canvas c = new Canvas(b); 484 c.scale(tv.getScaleX(), tv.getScaleY()); 485 tv.mHeaderView.draw(c); 486 c.setBitmap(null); 487 } 488 } else { 489 // Notify the system to skip the thumbnail layer by using an ALPHA_8 bitmap 490 b = Bitmap.createBitmap(1, 1, Bitmap.Config.ALPHA_8); 491 } 492 ActivityOptions.OnAnimationStartedListener animStartedListener = null; 493 if (lockToTask) { 494 animStartedListener = new ActivityOptions.OnAnimationStartedListener() { 495 boolean mTriggered = false; 496 @Override 497 public void onAnimationStarted() { 498 if (!mTriggered) { 499 postDelayed(new Runnable() { 500 @Override 501 public void run() { 502 mCb.onScreenPinningRequest(); 503 } 504 }, 350); 505 mTriggered = true; 506 } 507 } 508 }; 509 } 510 if (mConfig.multiStackEnabled) { 511 opts = ActivityOptions.makeCustomAnimation(sourceView.getContext(), 512 R.anim.recents_from_unknown_enter, 513 R.anim.recents_from_unknown_exit, 514 sourceView.getHandler(), animStartedListener); 515 } else { 516 opts = ActivityOptions.makeThumbnailAspectScaleUpAnimation(sourceView, 517 b, offsetX, offsetY, transform.rect.width(), transform.rect.height(), 518 sourceView.getHandler(), animStartedListener); 519 } 520 } 521 522 final ActivityOptions launchOpts = opts; 523 final Runnable launchRunnable = new Runnable() { 524 @Override 525 public void run() { 526 if (task.isActive) { 527 // Bring an active task to the foreground 528 ssp.moveTaskToFront(task.key.id, launchOpts); 529 } else { 530 if (ssp.startActivityFromRecents(getContext(), task.key.id, 531 task.activityLabel, launchOpts)) { 532 if (launchOpts == null && lockToTask) { 533 mCb.onScreenPinningRequest(); 534 } 535 } else { 536 // Dismiss the task and return the user to home if we fail to 537 // launch the task 538 onTaskViewDismissed(task); 539 if (mCb != null) { 540 mCb.onTaskLaunchFailed(); 541 } 542 } 543 } 544 } 545 }; 546 547 // Launch the app right away if there is no task view, otherwise, animate the icon out first 548 if (tv == null) { 549 launchRunnable.run(); 550 } else { 551 if (!task.group.isFrontMostTask(task)) { 552 // For affiliated tasks that are behind other tasks, we must animate the front cards 553 // out of view before starting the task transition 554 stackView.startLaunchTaskAnimation(tv, launchRunnable, lockToTask); 555 } else { 556 // Otherwise, we can start the task transition immediately 557 stackView.startLaunchTaskAnimation(tv, null, lockToTask); 558 launchRunnable.run(); 559 } 560 } 561 } 562 563 @Override 564 public void onTaskViewAppInfoClicked(Task t) { 565 // Create a new task stack with the application info details activity 566 Intent baseIntent = t.key.baseIntent; 567 Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS, 568 Uri.fromParts("package", baseIntent.getComponent().getPackageName(), null)); 569 intent.setComponent(intent.resolveActivity(getContext().getPackageManager())); 570 TaskStackBuilder.create(getContext()) 571 .addNextIntentWithParentStack(intent).startActivities(null, 572 new UserHandle(t.key.userId)); 573 } 574 575 @Override 576 public void onTaskViewDismissed(Task t) { 577 // Remove any stored data from the loader. We currently don't bother notifying the views 578 // that the data has been unloaded because at the point we call onTaskViewDismissed(), the views 579 // either don't need to be updated, or have already been removed. 580 RecentsTaskLoader loader = RecentsTaskLoader.getInstance(); 581 loader.deleteTaskData(t, false); 582 583 // Remove the old task from activity manager 584 loader.getSystemServicesProxy().removeTask(t.key.id); 585 } 586 587 @Override 588 public void onAllTaskViewsDismissed(ArrayList<Task> removedTasks) { 589 if (removedTasks != null) { 590 int taskCount = removedTasks.size(); 591 for (int i = 0; i < taskCount; i++) { 592 onTaskViewDismissed(removedTasks.get(i)); 593 } 594 } 595 596 mCb.onAllTaskViewsDismissed(); 597 } 598 599 /** Final callback after Recents is finally hidden. */ 600 public void onRecentsHidden() { 601 // Notify each task stack view 602 List<TaskStackView> stackViews = getTaskStackViews(); 603 int stackCount = stackViews.size(); 604 for (int i = 0; i < stackCount; i++) { 605 TaskStackView stackView = stackViews.get(i); 606 stackView.onRecentsHidden(); 607 } 608 } 609 610 @Override 611 public void onTaskStackFilterTriggered() { 612 // Hide the search bar 613 if (mSearchBar != null) { 614 mSearchBar.animate() 615 .alpha(0f) 616 .setStartDelay(0) 617 .setInterpolator(mConfig.fastOutSlowInInterpolator) 618 .setDuration(mConfig.filteringCurrentViewsAnimDuration) 619 .withLayer() 620 .start(); 621 } 622 } 623 624 @Override 625 public void onTaskStackUnfilterTriggered() { 626 // Show the search bar 627 if (mSearchBar != null) { 628 mSearchBar.animate() 629 .alpha(1f) 630 .setStartDelay(0) 631 .setInterpolator(mConfig.fastOutSlowInInterpolator) 632 .setDuration(mConfig.filteringNewViewsAnimDuration) 633 .withLayer() 634 .start(); 635 } 636 } 637 638 @Override 639 public void onTaskResize(Task t) { 640 if (mCb != null) { 641 mCb.onTaskResize(t); 642 } 643 } 644 645 /**** RecentsPackageMonitor.PackageCallbacks Implementation ****/ 646 647 @Override 648 public void onPackagesChanged(RecentsPackageMonitor monitor, String packageName, int userId) { 649 // Propagate this event down to each task stack view 650 List<TaskStackView> stackViews = getTaskStackViews(); 651 int stackCount = stackViews.size(); 652 for (int i = 0; i < stackCount; i++) { 653 TaskStackView stackView = stackViews.get(i); 654 stackView.onPackagesChanged(monitor, packageName, userId); 655 } 656 } 657} 658