AppsCustomizePagedView.java revision b44b52439d155f570db7d6d0b80fdd3350e35685
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 com.android.launcher2; 18 19import android.animation.AnimatorSet; 20import android.animation.ObjectAnimator; 21import android.animation.ValueAnimator; 22import android.appwidget.AppWidgetManager; 23import android.appwidget.AppWidgetProviderInfo; 24import android.content.ComponentName; 25import android.content.Context; 26import android.content.Intent; 27import android.content.pm.ActivityInfo; 28import android.content.pm.PackageManager; 29import android.content.pm.ResolveInfo; 30import android.content.res.Configuration; 31import android.content.res.Resources; 32import android.content.res.TypedArray; 33import android.graphics.Bitmap; 34import android.graphics.Bitmap.Config; 35import android.graphics.Canvas; 36import android.graphics.Color; 37import android.graphics.Paint; 38import android.graphics.PorterDuff.Mode; 39import android.graphics.Rect; 40import android.graphics.drawable.Drawable; 41import android.os.AsyncTask; 42import android.os.Process; 43import android.util.AttributeSet; 44import android.util.Log; 45import android.view.LayoutInflater; 46import android.view.View; 47import android.view.ViewGroup; 48import android.view.animation.AccelerateInterpolator; 49import android.widget.ImageView; 50import android.widget.TextView; 51import android.widget.Toast; 52 53import com.android.launcher.R; 54import com.android.launcher2.DropTarget.DragObject; 55 56import java.util.ArrayList; 57import java.util.Collections; 58import java.util.Iterator; 59import java.util.List; 60 61/** 62 * A simple callback interface which also provides the results of the task. 63 */ 64interface AsyncTaskCallback { 65 void run(AppsCustomizeAsyncTask task, AsyncTaskPageData data); 66} 67/** 68 * The data needed to perform either of the custom AsyncTasks. 69 */ 70class AsyncTaskPageData { 71 AsyncTaskPageData(int p, ArrayList<Object> l, ArrayList<Bitmap> si, AsyncTaskCallback bgR, 72 AsyncTaskCallback postR) { 73 page = p; 74 items = l; 75 srcImages = si; 76 images = new ArrayList<Bitmap>(); 77 cellWidth = cellHeight = -1; 78 doInBackgroundCallback = bgR; 79 postExecuteCallback = postR; 80 } 81 AsyncTaskPageData(int p, ArrayList<Object> l, int cw, int ch, AsyncTaskCallback bgR, 82 AsyncTaskCallback postR) { 83 page = p; 84 items = l; 85 images = new ArrayList<Bitmap>(); 86 cellWidth = cw; 87 cellHeight = ch; 88 doInBackgroundCallback = bgR; 89 postExecuteCallback = postR; 90 } 91 int page; 92 ArrayList<Object> items; 93 ArrayList<Bitmap> srcImages; 94 ArrayList<Bitmap> images; 95 int cellWidth; 96 int cellHeight; 97 AsyncTaskCallback doInBackgroundCallback; 98 AsyncTaskCallback postExecuteCallback; 99} 100/** 101 * A generic template for an async task used in AppsCustomize. 102 */ 103class AppsCustomizeAsyncTask extends AsyncTask<AsyncTaskPageData, Void, AsyncTaskPageData> { 104 AppsCustomizeAsyncTask(int p, AppsCustomizePagedView.ContentType t) { 105 page = p; 106 pageContentType = t; 107 threadPriority = Process.THREAD_PRIORITY_DEFAULT; 108 } 109 @Override 110 protected AsyncTaskPageData doInBackground(AsyncTaskPageData... params) { 111 if (params.length != 1) return null; 112 // Load each of the widget previews in the background 113 params[0].doInBackgroundCallback.run(this, params[0]); 114 return params[0]; 115 } 116 @Override 117 protected void onPostExecute(AsyncTaskPageData result) { 118 // All the widget previews are loaded, so we can just callback to inflate the page 119 result.postExecuteCallback.run(this, result); 120 } 121 122 void setThreadPriority(int p) { 123 threadPriority = p; 124 } 125 void syncThreadPriority() { 126 Process.setThreadPriority(threadPriority); 127 } 128 129 // The page that this async task is associated with 130 int page; 131 AppsCustomizePagedView.ContentType pageContentType; 132 int threadPriority; 133} 134/** 135 * An AsyncTask that loads widget previews from package manager in the background. 136 */ 137class LoadWidgetPreviewsTask extends AppsCustomizeAsyncTask { 138 LoadWidgetPreviewsTask(int p, AppsCustomizePagedView.ContentType t) { 139 super(p, t); 140 } 141} 142/** 143 * An AsyncTask that generates holgoraphic outlines for a specified set of bitmaps. 144 */ 145class GenerateHoloOutlinesTask extends AppsCustomizeAsyncTask { 146 GenerateHoloOutlinesTask(int p, AppsCustomizePagedView.ContentType t) { 147 super(p, t); 148 } 149} 150 151/** 152 * The Apps/Customize page that displays all the applications, widgets, and shortcuts. 153 */ 154public class AppsCustomizePagedView extends PagedViewWithDraggableItems implements 155 AllAppsView, View.OnClickListener, DragSource { 156 static final String LOG_TAG = "AppsCustomizePagedView"; 157 158 /** 159 * The different content types that this paged view can show. 160 */ 161 public enum ContentType { 162 Applications, 163 Widgets 164 } 165 166 // Refs 167 private Launcher mLauncher; 168 private DragController mDragController; 169 private final LayoutInflater mLayoutInflater; 170 private final PackageManager mPackageManager; 171 172 // Content 173 private ContentType mContentType; 174 private ArrayList<ApplicationInfo> mApps; 175 private List<Object> mWidgets; 176 177 // Caching 178 private Canvas mCanvas; 179 private Drawable mDefaultWidgetBackground; 180 private IconCache mIconCache; 181 182 // Dimens 183 private int mContentWidth; 184 private int mMaxWidgetSpan, mMinWidgetSpan; 185 private int mWidgetWidthGap, mWidgetHeightGap; 186 private int mWidgetCountX, mWidgetCountY; 187 private final int mWidgetPreviewIconPaddedDimension; 188 private final float sWidgetPreviewIconPaddingPercentage = 0.25f; 189 private PagedViewCellLayout mWidgetSpacingLayout; 190 191 // Previews & outlines 192 ArrayList<AppsCustomizeAsyncTask> mRunningTasks; 193 private HolographicOutlineHelper mHolographicOutlineHelper; 194 195 public AppsCustomizePagedView(Context context, AttributeSet attrs) { 196 super(context, attrs); 197 mLayoutInflater = LayoutInflater.from(context); 198 mPackageManager = context.getPackageManager(); 199 mContentType = ContentType.Applications; 200 mApps = new ArrayList<ApplicationInfo>(); 201 mWidgets = new ArrayList<Object>(); 202 mIconCache = ((LauncherApplication) context.getApplicationContext()).getIconCache(); 203 mHolographicOutlineHelper = new HolographicOutlineHelper(); 204 mCanvas = new Canvas(); 205 mRunningTasks = new ArrayList<AppsCustomizeAsyncTask>(); 206 207 // Save the default widget preview background 208 Resources resources = context.getResources(); 209 mDefaultWidgetBackground = resources.getDrawable(R.drawable.default_widget_preview); 210 211 TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PagedView, 0, 0); 212 // TODO-APPS_CUSTOMIZE: remove these unnecessary attrs after 213 mCellCountX = a.getInt(R.styleable.PagedView_cellCountX, 6); 214 mCellCountY = a.getInt(R.styleable.PagedView_cellCountY, 4); 215 a.recycle(); 216 a = context.obtainStyledAttributes(attrs, R.styleable.AppsCustomizePagedView, 0, 0); 217 mWidgetWidthGap = 218 a.getDimensionPixelSize(R.styleable.AppsCustomizePagedView_widgetCellWidthGap, 0); 219 mWidgetHeightGap = 220 a.getDimensionPixelSize(R.styleable.AppsCustomizePagedView_widgetCellHeightGap, 0); 221 mWidgetCountX = a.getInt(R.styleable.AppsCustomizePagedView_widgetCountX, 2); 222 mWidgetCountY = a.getInt(R.styleable.AppsCustomizePagedView_widgetCountY, 2); 223 a.recycle(); 224 mWidgetSpacingLayout = new PagedViewCellLayout(getContext()); 225 226 // The max widget span is the length N, such that NxN is the largest bounds that the widget 227 // preview can be before applying the widget scaling 228 mMinWidgetSpan = 1; 229 mMaxWidgetSpan = 3; 230 231 // The padding on the non-matched dimension for the default widget preview icons 232 // (top + bottom) 233 int iconSize = resources.getDimensionPixelSize(R.dimen.app_icon_size); 234 mWidgetPreviewIconPaddedDimension = 235 (int) (iconSize * (1 + (2 * sWidgetPreviewIconPaddingPercentage))); 236 } 237 238 @Override 239 protected void init() { 240 super.init(); 241 mCenterPagesVertically = false; 242 243 Context context = getContext(); 244 Resources r = context.getResources(); 245 setDragSlopeThreshold(r.getInteger(R.integer.config_appsCustomizeDragSlopeThreshold)/100f); 246 } 247 248 @Override 249 protected void onWallpaperTap(android.view.MotionEvent ev) { 250 mLauncher.showWorkspace(true); 251 } 252 253 /** 254 * This differs from isDataReady as this is the test done if isDataReady is not set. 255 */ 256 private boolean testDataReady() { 257 return !mApps.isEmpty() && !mWidgets.isEmpty(); 258 } 259 260 protected void onDataReady(int width, int height) { 261 // Note that we transpose the counts in portrait so that we get a similar layout 262 boolean isLandscape = getResources().getConfiguration().orientation == 263 Configuration.ORIENTATION_LANDSCAPE; 264 int maxCellCountX = Integer.MAX_VALUE; 265 int maxCellCountY = Integer.MAX_VALUE; 266 if (LauncherApplication.isScreenLarge()) { 267 maxCellCountX = (isLandscape ? LauncherModel.getCellCountX() : 268 LauncherModel.getCellCountY()); 269 maxCellCountY = (isLandscape ? LauncherModel.getCellCountY() : 270 LauncherModel.getCellCountX()); 271 } 272 273 // Now that the data is ready, we can calculate the content width, the number of cells to 274 // use for each page 275 mWidgetSpacingLayout.setGap(mPageLayoutWidthGap, mPageLayoutHeightGap); 276 mWidgetSpacingLayout.setPadding(mPageLayoutPaddingLeft, mPageLayoutPaddingTop, 277 mPageLayoutPaddingRight, mPageLayoutPaddingBottom); 278 mWidgetSpacingLayout.calculateCellCount(width, height, maxCellCountX, maxCellCountY); 279 mCellCountX = mWidgetSpacingLayout.getCellCountX(); 280 mCellCountY = mWidgetSpacingLayout.getCellCountY(); 281 mWidgetCountX = Math.max(1, (int) Math.round(mCellCountX / 2f)); 282 mWidgetCountY = Math.max(1, (int) Math.round(mCellCountY / 3f)); 283 mContentWidth = mWidgetSpacingLayout.getContentWidth(); 284 285 invalidatePageData(); 286 } 287 288 @Override 289 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 290 int width = MeasureSpec.getSize(widthMeasureSpec); 291 int height = MeasureSpec.getSize(heightMeasureSpec); 292 if (!isDataReady()) { 293 if (testDataReady()) { 294 setDataIsReady(); 295 setMeasuredDimension(width, height); 296 onDataReady(width, height); 297 } 298 } 299 300 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 301 } 302 303 /** Removes and returns the ResolveInfo with the specified ComponentName */ 304 private ResolveInfo removeResolveInfoWithComponentName(List<ResolveInfo> list, 305 ComponentName cn) { 306 Iterator<ResolveInfo> iter = list.iterator(); 307 while (iter.hasNext()) { 308 ResolveInfo rinfo = iter.next(); 309 ActivityInfo info = rinfo.activityInfo; 310 ComponentName c = new ComponentName(info.packageName, info.name); 311 if (c.equals(cn)) { 312 iter.remove(); 313 return rinfo; 314 } 315 } 316 return null; 317 } 318 319 public void onPackagesUpdated() { 320 // Get the list of widgets and shortcuts 321 mWidgets.clear(); 322 List<AppWidgetProviderInfo> widgets = 323 AppWidgetManager.getInstance(mLauncher).getInstalledProviders(); 324 Collections.sort(widgets, 325 new LauncherModel.WidgetAndShortcutNameComparator(mPackageManager)); 326 Intent shortcutsIntent = new Intent(Intent.ACTION_CREATE_SHORTCUT); 327 List<ResolveInfo> shortcuts = mPackageManager.queryIntentActivities(shortcutsIntent, 0); 328 Collections.sort(shortcuts, 329 new LauncherModel.WidgetAndShortcutNameComparator(mPackageManager)); 330 mWidgets.addAll(widgets); 331 mWidgets.addAll(shortcuts); 332 333 // The next layout pass will trigger data-ready if both widgets and apps are set, so request 334 // a layout to do this test and invalidate the page data when ready. 335 if (testDataReady()) requestLayout(); 336 } 337 338 @Override 339 public void onClick(View v) { 340 if (v instanceof PagedViewIcon) { 341 // Animate some feedback to the click 342 final ApplicationInfo appInfo = (ApplicationInfo) v.getTag(); 343 animateClickFeedback(v, new Runnable() { 344 @Override 345 public void run() { 346 mLauncher.startActivitySafely(appInfo.intent, appInfo); 347 } 348 }); 349 } else if (v instanceof PagedViewWidget) { 350 // Let the user know that they have to long press to add a widget 351 Toast.makeText(getContext(), R.string.long_press_widget_to_add, 352 Toast.LENGTH_SHORT).show(); 353 354 // Create a little animation to show that the widget can move 355 float offsetY = getResources().getDimensionPixelSize(R.dimen.dragViewOffsetY); 356 final ImageView p = (ImageView) v.findViewById(R.id.widget_preview); 357 AnimatorSet bounce = new AnimatorSet(); 358 ValueAnimator tyuAnim = ObjectAnimator.ofFloat(p, "translationY", offsetY); 359 tyuAnim.setDuration(125); 360 ValueAnimator tydAnim = ObjectAnimator.ofFloat(p, "translationY", 0f); 361 tydAnim.setDuration(100); 362 bounce.play(tyuAnim).before(tydAnim); 363 bounce.setInterpolator(new AccelerateInterpolator()); 364 bounce.start(); 365 } 366 } 367 368 /* 369 * PagedViewWithDraggableItems implementation 370 */ 371 @Override 372 protected void determineDraggingStart(android.view.MotionEvent ev) { 373 // Disable dragging by pulling an app down for now. 374 } 375 private void beginDraggingApplication(View v) { 376 // Make a copy of the ApplicationInfo 377 ApplicationInfo appInfo = new ApplicationInfo((ApplicationInfo) v.getTag()); 378 379 // Compose the drag image (top compound drawable, index is 1) 380 final TextView tv = (TextView) v; 381 final Drawable icon = tv.getCompoundDrawables()[1]; 382 Bitmap b = Bitmap.createBitmap(v.getWidth(), v.getHeight(), 383 Bitmap.Config.ARGB_8888); 384 mCanvas.setBitmap(b); 385 mCanvas.save(); 386 mCanvas.translate((v.getWidth() - icon.getIntrinsicWidth()) / 2, v.getPaddingTop()); 387 icon.draw(mCanvas); 388 mCanvas.restore(); 389 390 // Compose the visible rect of the drag image 391 Rect dragRect = null; 392 if (v instanceof TextView) { 393 int iconSize = getResources().getDimensionPixelSize(R.dimen.app_icon_size); 394 int top = v.getPaddingTop(); 395 int left = (b.getWidth() - iconSize) / 2; 396 int right = left + iconSize; 397 int bottom = top + iconSize; 398 dragRect = new Rect(left, top, right, bottom); 399 } 400 401 // Start the drag 402 mLauncher.lockScreenOrientation(); 403 mLauncher.getWorkspace().onDragStartedWithItemSpans(1, 1, b); 404 mDragController.startDrag(v, b, this, appInfo, DragController.DRAG_ACTION_COPY, dragRect); 405 b.recycle(); 406 } 407 private void beginDraggingWidget(View v) { 408 // Get the widget preview as the drag representation 409 ImageView image = (ImageView) v.findViewById(R.id.widget_preview); 410 PendingAddItemInfo createItemInfo = (PendingAddItemInfo) v.getTag(); 411 412 // Compose the drag image 413 Bitmap b; 414 Drawable preview = image.getDrawable(); 415 int w = preview.getIntrinsicWidth(); 416 int h = preview.getIntrinsicHeight(); 417 if (createItemInfo instanceof PendingAddWidgetInfo) { 418 PendingAddWidgetInfo createWidgetInfo = (PendingAddWidgetInfo) createItemInfo; 419 int[] spanXY = CellLayout.rectToCell(getResources(), 420 createWidgetInfo.minWidth, createWidgetInfo.minHeight, null); 421 createItemInfo.spanX = spanXY[0]; 422 createItemInfo.spanY = spanXY[1]; 423 424 b = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); 425 renderDrawableToBitmap(preview, b, 0, 0, w, h, 1, 1); 426 } else { 427 // Workaround for the fact that we don't keep the original ResolveInfo associated with 428 // the shortcut around. To get the icon, we just render the preview image (which has 429 // the shortcut icon) to a new drag bitmap that clips the non-icon space. 430 b = Bitmap.createBitmap(mWidgetPreviewIconPaddedDimension, 431 mWidgetPreviewIconPaddedDimension, Bitmap.Config.ARGB_8888); 432 mCanvas.setBitmap(b); 433 mCanvas.save(); 434 preview.draw(mCanvas); 435 mCanvas.restore(); 436 createItemInfo.spanX = createItemInfo.spanY = 1; 437 } 438 439 // Start the drag 440 mLauncher.lockScreenOrientation(); 441 mLauncher.getWorkspace().onDragStartedWithItemSpans(createItemInfo.spanX, 442 createItemInfo.spanY, b); 443 mDragController.startDrag(image, b, this, createItemInfo, 444 DragController.DRAG_ACTION_COPY, null); 445 b.recycle(); 446 } 447 @Override 448 protected boolean beginDragging(View v) { 449 if (!super.beginDragging(v)) return false; 450 451 452 if (v instanceof PagedViewIcon) { 453 beginDraggingApplication(v); 454 } else if (v instanceof PagedViewWidget) { 455 beginDraggingWidget(v); 456 } 457 458 // Go into spring loaded mode 459 int currentPageIndex = mLauncher.getWorkspace().getCurrentPage(); 460 CellLayout currentPage = (CellLayout) mLauncher.getWorkspace().getChildAt(currentPageIndex); 461 mLauncher.enterSpringLoadedDragMode(currentPage); 462 return true; 463 } 464 private void endDragging(boolean success) { 465 post(new Runnable() { 466 // Once the drag operation has fully completed, hence the post, we want to disable the 467 // deleteZone and the appInfoButton in all apps, and re-enable the instance which 468 // live in the workspace 469 public void run() { 470 // if onDestroy was called on Launcher, we might have already deleted the 471 // all apps delete zone / info button, so check if they are null 472 DeleteZone allAppsDeleteZone = 473 (DeleteZone) mLauncher.findViewById(R.id.all_apps_delete_zone); 474 ApplicationInfoDropTarget allAppsInfoButton = 475 (ApplicationInfoDropTarget) mLauncher.findViewById(R.id.all_apps_info_target); 476 477 if (allAppsDeleteZone != null) allAppsDeleteZone.setDragAndDropEnabled(false); 478 if (allAppsInfoButton != null) allAppsInfoButton.setDragAndDropEnabled(false); 479 } 480 }); 481 mLauncher.exitSpringLoadedDragMode(); 482 mLauncher.getWorkspace().onDragStopped(success); 483 mLauncher.unlockScreenOrientation(); 484 485 } 486 487 /* 488 * DragSource implementation 489 */ 490 @Override 491 public void onDragViewVisible() {} 492 @Override 493 public void onDropCompleted(View target, DragObject d, boolean success) { 494 endDragging(success); 495 496 // Display an error message if the drag failed due to there not being enough space on the 497 // target layout we were dropping on. 498 if (!success) { 499 boolean showOutOfSpaceMessage = false; 500 if (target instanceof Workspace) { 501 int currentScreen = mLauncher.getCurrentWorkspaceScreen(); 502 Workspace workspace = (Workspace) target; 503 CellLayout layout = (CellLayout) workspace.getChildAt(currentScreen); 504 ItemInfo itemInfo = (ItemInfo) d.dragInfo; 505 if (layout != null) { 506 layout.calculateSpans(itemInfo); 507 showOutOfSpaceMessage = 508 !layout.findCellForSpan(null, itemInfo.spanX, itemInfo.spanY); 509 } 510 } 511 // TODO-APPS_CUSTOMIZE: We need to handle this for folders as well later. 512 if (showOutOfSpaceMessage) { 513 mLauncher.showOutOfSpaceMessage(); 514 } 515 } 516 } 517 518 public void setContentType(ContentType type) { 519 mContentType = type; 520 setCurrentPage(0); 521 invalidatePageData(); 522 } 523 524 public boolean isContentType(ContentType type) { 525 return (mContentType == type); 526 } 527 528 /* 529 * Apps PagedView implementation 530 */ 531 private void setVisibilityOnChildren(ViewGroup layout, int visibility) { 532 int childCount = layout.getChildCount(); 533 for (int i = 0; i < childCount; ++i) { 534 layout.getChildAt(i).setVisibility(visibility); 535 } 536 } 537 private void setupPage(PagedViewCellLayout layout) { 538 layout.setCellCount(mCellCountX, mCellCountY); 539 layout.setGap(mPageLayoutWidthGap, mPageLayoutHeightGap); 540 layout.setPadding(mPageLayoutPaddingLeft, mPageLayoutPaddingTop, 541 mPageLayoutPaddingRight, mPageLayoutPaddingBottom); 542 543 // Note: We force a measure here to get around the fact that when we do layout calculations 544 // immediately after syncing, we don't have a proper width. That said, we already know the 545 // expected page width, so we can actually optimize by hiding all the TextView-based 546 // children that are expensive to measure, and let that happen naturally later. 547 setVisibilityOnChildren(layout, View.GONE); 548 int widthSpec = MeasureSpec.makeMeasureSpec(getMeasuredWidth(), MeasureSpec.AT_MOST); 549 int heightSpec = MeasureSpec.makeMeasureSpec(getMeasuredHeight(), MeasureSpec.AT_MOST); 550 layout.setMinimumWidth(getPageContentWidth()); 551 layout.measure(widthSpec, heightSpec); 552 setVisibilityOnChildren(layout, View.VISIBLE); 553 } 554 public void syncAppsPages() { 555 // Ensure that we have the right number of pages 556 Context context = getContext(); 557 int numPages = (int) Math.ceil((float) mApps.size() / (mCellCountX * mCellCountY)); 558 for (int i = 0; i < numPages; ++i) { 559 PagedViewCellLayout layout = new PagedViewCellLayout(context); 560 setupPage(layout); 561 addView(layout); 562 } 563 } 564 public void syncAppsPageItems(int page) { 565 // ensure that we have the right number of items on the pages 566 int numPages = getPageCount(); 567 int numCells = mCellCountX * mCellCountY; 568 int startIndex = page * numCells; 569 int endIndex = Math.min(startIndex + numCells, mApps.size()); 570 PagedViewCellLayout layout = (PagedViewCellLayout) getChildAt(page); 571 layout.removeAllViewsOnPage(); 572 ArrayList<Object> items = new ArrayList<Object>(); 573 ArrayList<Bitmap> images = new ArrayList<Bitmap>(); 574 for (int i = startIndex; i < endIndex; ++i) { 575 ApplicationInfo info = mApps.get(i); 576 PagedViewIcon icon = (PagedViewIcon) mLayoutInflater.inflate( 577 R.layout.apps_customize_application, layout, false); 578 icon.applyFromApplicationInfo(info, true, mHolographicOutlineHelper); 579 icon.setOnClickListener(this); 580 icon.setOnLongClickListener(this); 581 icon.setOnTouchListener(this); 582 583 int index = i - startIndex; 584 int x = index % mCellCountX; 585 int y = index / mCellCountX; 586 layout.addViewToCellLayout(icon, -1, i, new PagedViewCellLayout.LayoutParams(x,y, 1,1)); 587 588 items.add(info); 589 images.add(info.iconBitmap); 590 } 591 592 // Create the hardware layers 593 layout.allowHardwareLayerCreation(); 594 layout.createHardwareLayers(); 595 596 prepareGenerateHoloOutlinesTask(page, items, images); 597 } 598 599 /** 600 * Return the appropriate thread priority for loading for a given page (we give the current 601 * page much higher priority) 602 */ 603 private int getThreadPriorityForPage(int page) { 604 // TODO-APPS_CUSTOMIZE: detect number of cores and set thread priorities accordingly below 605 int pageDiff = Math.abs(page - mCurrentPage); 606 if (pageDiff <= 0) { 607 // return Process.THREAD_PRIORITY_DEFAULT; 608 return Process.THREAD_PRIORITY_MORE_FAVORABLE; 609 } else if (pageDiff <= 1) { 610 // return Process.THREAD_PRIORITY_BACKGROUND; 611 return Process.THREAD_PRIORITY_DEFAULT; 612 } else { 613 // return Process.THREAD_PRIORITY_LOWEST; 614 return Process.THREAD_PRIORITY_DEFAULT; 615 } 616 } 617 /** 618 * Creates and executes a new AsyncTask to load a page of widget previews. 619 */ 620 private void prepareLoadWidgetPreviewsTask(int page, ArrayList<Object> widgets, 621 int cellWidth, int cellHeight) { 622 // Prune all tasks that are no longer needed 623 Iterator<AppsCustomizeAsyncTask> iter = mRunningTasks.iterator(); 624 while (iter.hasNext()) { 625 AppsCustomizeAsyncTask task = (AppsCustomizeAsyncTask) iter.next(); 626 int taskPage = task.page; 627 if (taskPage < (mCurrentPage - 2) || taskPage > (mCurrentPage + 2)) { 628 task.cancel(false); 629 iter.remove(); 630 } else { 631 task.setThreadPriority(getThreadPriorityForPage(taskPage)); 632 } 633 } 634 635 AsyncTaskPageData pageData = new AsyncTaskPageData(page, widgets, cellWidth, cellHeight, 636 new AsyncTaskCallback() { 637 @Override 638 public void run(AppsCustomizeAsyncTask task, AsyncTaskPageData data) { 639 // Ensure that this task starts running at the correct priority 640 task.syncThreadPriority(); 641 642 // Load each of the widget/shortcut previews 643 ArrayList<Object> items = data.items; 644 ArrayList<Bitmap> images = data.images; 645 int count = items.size(); 646 int cellWidth = data.cellWidth; 647 int cellHeight = data.cellHeight; 648 for (int i = 0; i < count && !task.isCancelled(); ++i) { 649 // Before work on each item, ensure that this task is running at the correct 650 // priority 651 task.syncThreadPriority(); 652 653 Object rawInfo = items.get(i); 654 if (rawInfo instanceof AppWidgetProviderInfo) { 655 AppWidgetProviderInfo info = (AppWidgetProviderInfo) rawInfo; 656 int[] cellSpans = CellLayout.rectToCell(getResources(), 657 info.minWidth, info.minHeight, null); 658 images.add(getWidgetPreviewInBackground(info, cellSpans[0],cellSpans[1], 659 cellWidth, cellHeight)); 660 } else if (rawInfo instanceof ResolveInfo) { 661 // Fill in the shortcuts information 662 ResolveInfo info = (ResolveInfo) rawInfo; 663 images.add(getShortcutPreviewInBackground(info, cellWidth, cellHeight)); 664 } 665 } 666 } 667 }, 668 new AsyncTaskCallback() { 669 @Override 670 public void run(AppsCustomizeAsyncTask task, AsyncTaskPageData data) { 671 mRunningTasks.remove(task); 672 if (task.page > getPageCount()) return; 673 if (task.pageContentType != mContentType) return; 674 onSyncWidgetPageItems(data); 675 } 676 }); 677 678 // Ensure that the task is appropriately prioritized and runs in parallel 679 LoadWidgetPreviewsTask t = new LoadWidgetPreviewsTask(page, mContentType); 680 t.setThreadPriority(getThreadPriorityForPage(page)); 681 t.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, pageData); 682 mRunningTasks.add(t); 683 } 684 /** 685 * Creates and executes a new AsyncTask to load the outlines for a page of content. 686 */ 687 private void prepareGenerateHoloOutlinesTask(int page, ArrayList<Object> items, 688 ArrayList<Bitmap> images) { 689 AsyncTaskPageData pageData = new AsyncTaskPageData(page, items, images, 690 new AsyncTaskCallback() { 691 @Override 692 public void run(AppsCustomizeAsyncTask task, AsyncTaskPageData data) { 693 // Ensure that this task starts running at the correct priority 694 task.syncThreadPriority(); 695 696 ArrayList<Bitmap> images = data.images; 697 ArrayList<Bitmap> srcImages = data.srcImages; 698 int count = srcImages.size(); 699 Canvas c = new Canvas(); 700 for (int i = 0; i < count && !task.isCancelled(); ++i) { 701 // Before work on each item, ensure that this task is running at the correct 702 // priority 703 task.syncThreadPriority(); 704 705 Bitmap b = srcImages.get(i); 706 Bitmap outline = Bitmap.createBitmap(b.getWidth(), b.getHeight(), 707 Bitmap.Config.ARGB_8888); 708 709 c.setBitmap(outline); 710 c.save(); 711 c.drawBitmap(b, 0, 0, null); 712 c.restore(); 713 714 images.add(outline); 715 } 716 } 717 }, 718 new AsyncTaskCallback() { 719 @Override 720 public void run(AppsCustomizeAsyncTask task, AsyncTaskPageData data) { 721 mRunningTasks.remove(task); 722 if (task.page > getPageCount()) return; 723 if (task.pageContentType != mContentType) return; 724 onHolographicPageItemsLoaded(data); 725 } 726 }); 727 728 // Ensure that the outline task always runs in the background, serially 729 GenerateHoloOutlinesTask t = 730 new GenerateHoloOutlinesTask(page, mContentType); 731 t.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND); 732 t.executeOnExecutor(AsyncTask.SERIAL_EXECUTOR, pageData); 733 mRunningTasks.add(t); 734 } 735 736 /* 737 * Widgets PagedView implementation 738 */ 739 private void setupPage(PagedViewGridLayout layout) { 740 layout.setPadding(mPageLayoutPaddingLeft, mPageLayoutPaddingTop, 741 mPageLayoutPaddingRight, mPageLayoutPaddingBottom); 742 743 // Note: We force a measure here to get around the fact that when we do layout calculations 744 // immediately after syncing, we don't have a proper width. That said, we already know the 745 // expected page width, so we can actually optimize by hiding all the TextView-based 746 // children that are expensive to measure, and let that happen naturally later. 747 setVisibilityOnChildren(layout, View.GONE); 748 int widthSpec = MeasureSpec.makeMeasureSpec(getMeasuredWidth(), MeasureSpec.AT_MOST); 749 int heightSpec = MeasureSpec.makeMeasureSpec(getMeasuredHeight(), MeasureSpec.AT_MOST); 750 layout.setMinimumWidth(getPageContentWidth()); 751 layout.measure(widthSpec, heightSpec); 752 setVisibilityOnChildren(layout, View.VISIBLE); 753 } 754 private synchronized void renderDrawableToBitmap(Drawable d, Bitmap bitmap, int x, int y, int w, int h, 755 float scaleX, float scaleY) { 756 if (bitmap != null) { 757 Canvas c = new Canvas(bitmap); 758 c.scale(scaleX, scaleY); 759 Rect oldBounds = d.copyBounds(); 760 d.setBounds(x, y, x + w, y + h); 761 d.draw(c); 762 d.setBounds(oldBounds); // Restore the bounds 763 } 764 } 765 private Bitmap getShortcutPreviewInBackground(ResolveInfo info, int cellWidth, 766 int cellHeight) { 767 Resources resources = mLauncher.getResources(); 768 int iconSize = resources.getDimensionPixelSize(R.dimen.app_icon_size); 769 // We only need to make it wide enough so as not allow the preview to be scaled 770 int expectedWidth = cellWidth; 771 int expectedHeight = mWidgetPreviewIconPaddedDimension; 772 773 // Render the icon 774 Bitmap preview = Bitmap.createBitmap(expectedWidth, expectedHeight, Config.ARGB_8888); 775 Drawable icon = mIconCache.getFullResIcon(info, mPackageManager); 776 renderDrawableToBitmap(icon, preview, 0, 0, iconSize, iconSize, 1f, 1f); 777 return preview; 778 } 779 private Bitmap getWidgetPreviewInBackground(AppWidgetProviderInfo info, 780 int cellHSpan, int cellVSpan, int cellWidth, int cellHeight) { 781 782 // Calculate the size of the drawable 783 cellHSpan = Math.max(mMinWidgetSpan, Math.min(mMaxWidgetSpan, cellHSpan)); 784 cellVSpan = Math.max(mMinWidgetSpan, Math.min(mMaxWidgetSpan, cellVSpan)); 785 int expectedWidth = mWidgetSpacingLayout.estimateCellWidth(cellHSpan); 786 int expectedHeight = mWidgetSpacingLayout.estimateCellHeight(cellVSpan); 787 788 // Scale down the bitmap to fit the space 789 float widgetPreviewScale = (float) cellWidth / expectedWidth; 790 expectedWidth = (int) (widgetPreviewScale * expectedWidth); 791 expectedHeight = (int) (widgetPreviewScale * expectedHeight); 792 793 // Load the preview image if possible 794 String packageName = info.provider.getPackageName(); 795 Drawable drawable = null; 796 Bitmap preview = null; 797 if (info.previewImage != 0) { 798 drawable = mPackageManager.getDrawable(packageName, info.previewImage, null); 799 if (drawable == null) { 800 Log.w(LOG_TAG, "Can't load icon drawable 0x" + Integer.toHexString(info.icon) 801 + " for provider: " + info.provider); 802 } else { 803 // Scale down the preview to the dimensions we want 804 int imageWidth = drawable.getIntrinsicWidth(); 805 int imageHeight = drawable.getIntrinsicHeight(); 806 float aspect = (float) imageWidth / imageHeight; 807 int newWidth = imageWidth; 808 int newHeight = imageHeight; 809 if (aspect > 1f) { 810 newWidth = expectedWidth; 811 newHeight = (int) (imageHeight * ((float) expectedWidth / imageWidth)); 812 } else { 813 newHeight = expectedHeight; 814 newWidth = (int) (imageWidth * ((float) expectedHeight / imageHeight)); 815 } 816 817 preview = Bitmap.createBitmap(newWidth, newHeight, Config.ARGB_8888); 818 renderDrawableToBitmap(drawable, preview, 0, 0, newWidth, newHeight, 1f, 1f); 819 } 820 } 821 822 // Generate a preview image if we couldn't load one 823 if (drawable == null) { 824 Resources resources = mLauncher.getResources(); 825 int iconSize = resources.getDimensionPixelSize(R.dimen.app_icon_size); 826 827 // Specify the dimensions of the bitmap 828 if (info.minWidth >= info.minHeight) { 829 expectedWidth = cellWidth; 830 expectedHeight = mWidgetPreviewIconPaddedDimension; 831 } else { 832 // Note that in vertical widgets, we might not have enough space due to the text 833 // label, so be conservative and use the width as a height bound 834 expectedWidth = mWidgetPreviewIconPaddedDimension; 835 expectedHeight = cellWidth; 836 } 837 838 preview = Bitmap.createBitmap(expectedWidth, expectedHeight, Config.ARGB_8888); 839 renderDrawableToBitmap(mDefaultWidgetBackground, preview, 0, 0, expectedWidth, 840 expectedHeight, 1f,1f); 841 842 // Draw the icon in the top left corner 843 try { 844 Drawable icon = null; 845 if (info.icon > 0) icon = mPackageManager.getDrawable(packageName, info.icon, null); 846 if (icon == null) icon = resources.getDrawable(R.drawable.ic_launcher_application); 847 848 int offset = (int) (iconSize * sWidgetPreviewIconPaddingPercentage); 849 renderDrawableToBitmap(icon, preview, offset, offset, iconSize, iconSize, 1f, 1f); 850 } catch (Resources.NotFoundException e) {} 851 } 852 return preview; 853 } 854 public void syncWidgetPages() { 855 // Ensure that we have the right number of pages 856 Context context = getContext(); 857 int numWidgetsPerPage = mWidgetCountX * mWidgetCountY; 858 int numPages = (int) Math.ceil(mWidgets.size() / (float) numWidgetsPerPage); 859 for (int i = 0; i < numPages; ++i) { 860 PagedViewGridLayout layout = new PagedViewGridLayout(context, mWidgetCountX, 861 mWidgetCountY); 862 setupPage(layout); 863 addView(layout); 864 } 865 } 866 public void syncWidgetPageItems(int page) { 867 // Calculate the dimensions of each cell we are giving to each widget 868 ArrayList<Object> widgets = new ArrayList<Object>(); 869 int cellWidth = ((mWidgetSpacingLayout.getContentWidth() 870 - mPageLayoutPaddingLeft - mPageLayoutPaddingRight 871 - ((mWidgetCountX - 1) * mWidgetWidthGap)) / mWidgetCountX); 872 int cellHeight = ((mWidgetSpacingLayout.getContentHeight() 873 - mPageLayoutPaddingTop - mPageLayoutPaddingBottom 874 - ((mWidgetCountY - 1) * mWidgetHeightGap)) / mWidgetCountY); 875 876 int numWidgetsPerPage = mWidgetCountX * mWidgetCountY; 877 int offset = page * numWidgetsPerPage; 878 for (int i = offset; i < Math.min(offset + numWidgetsPerPage, mWidgets.size()); ++i) { 879 widgets.add(mWidgets.get(i)); 880 } 881 882 prepareLoadWidgetPreviewsTask(page, widgets, cellWidth, cellHeight); 883 } 884 private void onSyncWidgetPageItems(AsyncTaskPageData data) { 885 int page = data.page; 886 PagedViewGridLayout layout = (PagedViewGridLayout) getChildAt(page); 887 layout.removeAllViews(); 888 889 ArrayList<Object> items = data.items; 890 int count = items.size(); 891 int cellWidth = data.cellWidth; 892 int cellHeight = data.cellHeight; 893 for (int i = 0; i < count; ++i) { 894 Object rawInfo = items.get(i); 895 PendingAddItemInfo createItemInfo = null; 896 PagedViewWidget widget = (PagedViewWidget) mLayoutInflater.inflate( 897 R.layout.apps_customize_widget, layout, false); 898 if (rawInfo instanceof AppWidgetProviderInfo) { 899 // Fill in the widget information 900 AppWidgetProviderInfo info = (AppWidgetProviderInfo) rawInfo; 901 createItemInfo = new PendingAddWidgetInfo(info, null, null); 902 int[] cellSpans = CellLayout.rectToCell(getResources(), 903 info.minWidth, info.minHeight, null); 904 FastBitmapDrawable preview = new FastBitmapDrawable(data.images.get(i)); 905 widget.applyFromAppWidgetProviderInfo(info, preview, -1, cellSpans, 906 mHolographicOutlineHelper); 907 widget.setTag(createItemInfo); 908 } else if (rawInfo instanceof ResolveInfo) { 909 // Fill in the shortcuts information 910 ResolveInfo info = (ResolveInfo) rawInfo; 911 createItemInfo = new PendingAddItemInfo(); 912 createItemInfo.itemType = LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT; 913 createItemInfo.componentName = new ComponentName(info.activityInfo.packageName, 914 info.activityInfo.name); 915 FastBitmapDrawable preview = new FastBitmapDrawable(data.images.get(i)); 916 widget.applyFromResolveInfo(mPackageManager, info, preview, 917 mHolographicOutlineHelper); 918 widget.setTag(createItemInfo); 919 } 920 widget.setOnClickListener(this); 921 widget.setOnLongClickListener(this); 922 widget.setOnTouchListener(this); 923 924 // Layout each widget 925 int ix = i % mWidgetCountX; 926 int iy = i / mWidgetCountX; 927 PagedViewGridLayout.LayoutParams lp = new PagedViewGridLayout.LayoutParams(cellWidth, 928 cellHeight); 929 lp.leftMargin = (ix * cellWidth) + (ix * mWidgetWidthGap); 930 lp.topMargin = (iy * cellHeight) + (iy * mWidgetHeightGap); 931 layout.addView(widget, lp); 932 } 933 934 invalidate(); 935 forceUpdateAdjacentPagesAlpha(); 936 prepareGenerateHoloOutlinesTask(data.page, data.items, data.images); 937 } 938 private void onHolographicPageItemsLoaded(AsyncTaskPageData data) { 939 // Invalidate early to short-circuit children invalidates 940 invalidate(); 941 942 int page = data.page; 943 ViewGroup layout = (ViewGroup) getChildAt(page); 944 if (layout instanceof PagedViewCellLayout) { 945 PagedViewCellLayout cl = (PagedViewCellLayout) layout; 946 int count = cl.getPageChildCount(); 947 for (int i = 0; i < count; ++i) { 948 PagedViewIcon icon = (PagedViewIcon) cl.getChildOnPageAt(i); 949 icon.setHolographicOutline(data.images.get(i)); 950 } 951 } else { 952 int count = layout.getChildCount(); 953 for (int i = 0; i < count; ++i) { 954 View v = layout.getChildAt(i); 955 ((PagedViewWidget) v).setHolographicOutline(data.images.get(i)); 956 } 957 } 958 } 959 960 @Override 961 public void syncPages() { 962 removeAllViews(); 963 switch (mContentType) { 964 case Applications: 965 syncAppsPages(); 966 break; 967 case Widgets: 968 syncWidgetPages(); 969 break; 970 } 971 } 972 @Override 973 public void syncPageItems(int page) { 974 switch (mContentType) { 975 case Applications: 976 syncAppsPageItems(page); 977 break; 978 case Widgets: 979 syncWidgetPageItems(page); 980 break; 981 } 982 } 983 984 /** 985 * Used by the parent to get the content width to set the tab bar to 986 * @return 987 */ 988 public int getPageContentWidth() { 989 return mContentWidth; 990 } 991 992 @Override 993 protected void onPageBeginMoving() { 994 /* TO BE ENABLED LATER 995 setChildrenDrawnWithCacheEnabled(true); 996 for (int i = 0; i < getChildCount(); ++i) { 997 View v = getChildAt(i); 998 if (v instanceof PagedViewCellLayout) { 999 ((PagedViewCellLayout) v).setChildrenDrawingCacheEnabled(true); 1000 } 1001 } 1002 */ 1003 super.onPageBeginMoving(); 1004 } 1005 1006 @Override 1007 protected void onPageEndMoving() { 1008 /* TO BE ENABLED LATER 1009 for (int i = 0; i < getChildCount(); ++i) { 1010 View v = getChildAt(i); 1011 if (v instanceof PagedViewCellLayout) { 1012 ((PagedViewCellLayout) v).setChildrenDrawingCacheEnabled(false); 1013 } 1014 } 1015 setChildrenDrawnWithCacheEnabled(false); 1016 */ 1017 super.onPageEndMoving(); 1018 } 1019 1020 /* 1021 * AllAppsView implementation 1022 */ 1023 @Override 1024 public void setup(Launcher launcher, DragController dragController) { 1025 mLauncher = launcher; 1026 mDragController = dragController; 1027 } 1028 @Override 1029 public void zoom(float zoom, boolean animate) { 1030 // TODO-APPS_CUSTOMIZE: Call back to mLauncher.zoomed() 1031 } 1032 @Override 1033 public boolean isVisible() { 1034 return (getVisibility() == VISIBLE); 1035 } 1036 @Override 1037 public boolean isAnimating() { 1038 return false; 1039 } 1040 @Override 1041 public void setApps(ArrayList<ApplicationInfo> list) { 1042 mApps = list; 1043 Collections.sort(mApps, LauncherModel.APP_NAME_COMPARATOR); 1044 1045 // The next layout pass will trigger data-ready if both widgets and apps are set, so request 1046 // a layout to do this test and invalidate the page data when ready. 1047 if (testDataReady()) requestLayout(); 1048 } 1049 private void addAppsWithoutInvalidate(ArrayList<ApplicationInfo> list) { 1050 // We add it in place, in alphabetical order 1051 int count = list.size(); 1052 for (int i = 0; i < count; ++i) { 1053 ApplicationInfo info = list.get(i); 1054 int index = Collections.binarySearch(mApps, info, LauncherModel.APP_NAME_COMPARATOR); 1055 if (index < 0) { 1056 mApps.add(-(index + 1), info); 1057 } 1058 } 1059 } 1060 @Override 1061 public void addApps(ArrayList<ApplicationInfo> list) { 1062 addAppsWithoutInvalidate(list); 1063 invalidatePageData(); 1064 } 1065 private int findAppByComponent(List<ApplicationInfo> list, ApplicationInfo item) { 1066 ComponentName removeComponent = item.intent.getComponent(); 1067 int length = list.size(); 1068 for (int i = 0; i < length; ++i) { 1069 ApplicationInfo info = list.get(i); 1070 if (info.intent.getComponent().equals(removeComponent)) { 1071 return i; 1072 } 1073 } 1074 return -1; 1075 } 1076 private void removeAppsWithoutInvalidate(ArrayList<ApplicationInfo> list) { 1077 // loop through all the apps and remove apps that have the same component 1078 int length = list.size(); 1079 for (int i = 0; i < length; ++i) { 1080 ApplicationInfo info = list.get(i); 1081 int removeIndex = findAppByComponent(mApps, info); 1082 if (removeIndex > -1) { 1083 mApps.remove(removeIndex); 1084 } 1085 } 1086 } 1087 @Override 1088 public void removeApps(ArrayList<ApplicationInfo> list) { 1089 removeAppsWithoutInvalidate(list); 1090 invalidatePageData(); 1091 } 1092 @Override 1093 public void updateApps(ArrayList<ApplicationInfo> list) { 1094 // We remove and re-add the updated applications list because it's properties may have 1095 // changed (ie. the title), and this will ensure that the items will be in their proper 1096 // place in the list. 1097 removeAppsWithoutInvalidate(list); 1098 addAppsWithoutInvalidate(list); 1099 invalidatePageData(); 1100 } 1101 @Override 1102 public void reset() { 1103 if (mContentType != ContentType.Applications) { 1104 // Reset to the first page of the Apps pane 1105 AppsCustomizeTabHost tabs = (AppsCustomizeTabHost) 1106 mLauncher.findViewById(R.id.apps_customize_pane); 1107 tabs.setCurrentTabByTag(tabs.getTabTagForContentType(ContentType.Applications)); 1108 } else { 1109 setCurrentPage(0); 1110 invalidatePageData(); 1111 } 1112 } 1113 @Override 1114 public void dumpState() { 1115 // TODO: Dump information related to current list of Applications, Widgets, etc. 1116 ApplicationInfo.dumpApplicationInfoList(LOG_TAG, "mApps", mApps); 1117 dumpAppWidgetProviderInfoList(LOG_TAG, "mWidgets", mWidgets); 1118 } 1119 private void dumpAppWidgetProviderInfoList(String tag, String label, 1120 List<Object> list) { 1121 Log.d(tag, label + " size=" + list.size()); 1122 for (Object i: list) { 1123 if (i instanceof AppWidgetProviderInfo) { 1124 AppWidgetProviderInfo info = (AppWidgetProviderInfo) i; 1125 Log.d(tag, " label=\"" + info.label + "\" previewImage=" + info.previewImage 1126 + " resizeMode=" + info.resizeMode + " configure=" + info.configure 1127 + " initialLayout=" + info.initialLayout 1128 + " minWidth=" + info.minWidth + " minHeight=" + info.minHeight); 1129 } else if (i instanceof ResolveInfo) { 1130 ResolveInfo info = (ResolveInfo) i; 1131 Log.d(tag, " label=\"" + info.loadLabel(mPackageManager) + "\" icon=" 1132 + info.icon); 1133 } 1134 } 1135 } 1136 @Override 1137 public void surrender() { 1138 // TODO: If we are in the middle of any process (ie. for holographic outlines, etc) we 1139 // should stop this now. 1140 } 1141 1142 @Override 1143 protected int getPageWidthForScrollingIndicator() { 1144 return getPageContentWidth(); 1145 } 1146 1147 /* 1148 * We load an extra page on each side to prevent flashes from scrolling and loading of the 1149 * widget previews in the background with the AsyncTasks. 1150 */ 1151 protected int getAssociatedLowerPageBound(int page) { 1152 return Math.max(0, page - 2); 1153 } 1154 protected int getAssociatedUpperPageBound(int page) { 1155 final int count = getChildCount(); 1156 return Math.min(page + 2, count - 1); 1157 } 1158} 1159