| package com.android.launcher3; |
| |
| import android.content.ComponentName; |
| import android.content.ContentValues; |
| import android.content.Context; |
| import android.content.pm.PackageInfo; |
| import android.content.pm.PackageManager.NameNotFoundException; |
| import android.content.pm.ResolveInfo; |
| import android.content.res.Resources; |
| import android.database.Cursor; |
| import android.database.SQLException; |
| import android.database.sqlite.SQLiteDatabase; |
| import android.graphics.Bitmap; |
| import android.graphics.Bitmap.Config; |
| import android.graphics.BitmapFactory; |
| import android.graphics.Canvas; |
| import android.graphics.ColorMatrix; |
| import android.graphics.ColorMatrixColorFilter; |
| import android.graphics.Paint; |
| import android.graphics.PorterDuff; |
| import android.graphics.Rect; |
| import android.graphics.RectF; |
| import android.graphics.drawable.BitmapDrawable; |
| import android.graphics.drawable.Drawable; |
| import android.os.AsyncTask; |
| import android.os.Handler; |
| import android.util.Log; |
| import android.util.LongSparseArray; |
| |
| import com.android.launcher3.compat.AppWidgetManagerCompat; |
| import com.android.launcher3.compat.UserHandleCompat; |
| import com.android.launcher3.compat.UserManagerCompat; |
| import com.android.launcher3.util.ComponentKey; |
| import com.android.launcher3.util.SQLiteCacheHelper; |
| import com.android.launcher3.util.Thunk; |
| import com.android.launcher3.widget.WidgetCell; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Set; |
| import java.util.WeakHashMap; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutionException; |
| |
| public class WidgetPreviewLoader { |
| |
| private static final String TAG = "WidgetPreviewLoader"; |
| private static final boolean DEBUG = false; |
| |
| private static final float WIDGET_PREVIEW_ICON_PADDING_PERCENTAGE = 0.25f; |
| |
| private final HashMap<String, long[]> mPackageVersions = new HashMap<>(); |
| |
| /** |
| * Weak reference objects, do not prevent their referents from being made finalizable, |
| * finalized, and then reclaimed. |
| * Note: synchronized block used for this variable is expensive and the block should always |
| * be posted to a background thread. |
| */ |
| @Thunk final Set<Bitmap> mUnusedBitmaps = |
| Collections.newSetFromMap(new WeakHashMap<Bitmap, Boolean>()); |
| |
| private final Context mContext; |
| private final IconCache mIconCache; |
| private final UserManagerCompat mUserManager; |
| private final AppWidgetManagerCompat mWidgetManager; |
| private final CacheDb mDb; |
| private final int mProfileBadgeMargin; |
| |
| private final MainThreadExecutor mMainThreadExecutor = new MainThreadExecutor(); |
| @Thunk final Handler mWorkerHandler; |
| |
| public WidgetPreviewLoader(Context context, IconCache iconCache) { |
| mContext = context; |
| mIconCache = iconCache; |
| mWidgetManager = AppWidgetManagerCompat.getInstance(context); |
| mUserManager = UserManagerCompat.getInstance(context); |
| mDb = new CacheDb(context); |
| mWorkerHandler = new Handler(LauncherModel.getWorkerLooper()); |
| mProfileBadgeMargin = context.getResources() |
| .getDimensionPixelSize(R.dimen.profile_badge_margin); |
| } |
| |
| /** |
| * Generates the widget preview on {@link AsyncTask#THREAD_POOL_EXECUTOR}. Must be |
| * called on UI thread |
| * |
| * @param o either {@link LauncherAppWidgetProviderInfo} or {@link ResolveInfo} |
| * @return a request id which can be used to cancel the request. |
| */ |
| public PreviewLoadRequest getPreview(final Object o, int previewWidth, |
| int previewHeight, WidgetCell caller) { |
| String size = previewWidth + "x" + previewHeight; |
| WidgetCacheKey key = getObjectKey(o, size); |
| |
| PreviewLoadTask task = new PreviewLoadTask(key, o, previewWidth, previewHeight, caller); |
| task.executeOnExecutor(Utilities.THREAD_POOL_EXECUTOR); |
| return new PreviewLoadRequest(task); |
| } |
| |
| /** |
| * The DB holds the generated previews for various components. Previews can also have different |
| * sizes (landscape vs portrait). |
| */ |
| private static class CacheDb extends SQLiteCacheHelper { |
| private static final int DB_VERSION = 4; |
| |
| private static final String TABLE_NAME = "shortcut_and_widget_previews"; |
| private static final String COLUMN_COMPONENT = "componentName"; |
| private static final String COLUMN_USER = "profileId"; |
| private static final String COLUMN_SIZE = "size"; |
| private static final String COLUMN_PACKAGE = "packageName"; |
| private static final String COLUMN_LAST_UPDATED = "lastUpdated"; |
| private static final String COLUMN_VERSION = "version"; |
| private static final String COLUMN_PREVIEW_BITMAP = "preview_bitmap"; |
| |
| public CacheDb(Context context) { |
| super(context, LauncherFiles.WIDGET_PREVIEWS_DB, DB_VERSION, TABLE_NAME); |
| } |
| |
| @Override |
| public void onCreateTable(SQLiteDatabase database) { |
| database.execSQL("CREATE TABLE IF NOT EXISTS " + TABLE_NAME + " (" + |
| COLUMN_COMPONENT + " TEXT NOT NULL, " + |
| COLUMN_USER + " INTEGER NOT NULL, " + |
| COLUMN_SIZE + " TEXT NOT NULL, " + |
| COLUMN_PACKAGE + " TEXT NOT NULL, " + |
| COLUMN_LAST_UPDATED + " INTEGER NOT NULL DEFAULT 0, " + |
| COLUMN_VERSION + " INTEGER NOT NULL DEFAULT 0, " + |
| COLUMN_PREVIEW_BITMAP + " BLOB, " + |
| "PRIMARY KEY (" + COLUMN_COMPONENT + ", " + COLUMN_USER + ", " + COLUMN_SIZE + ") " + |
| ");"); |
| } |
| } |
| |
| private WidgetCacheKey getObjectKey(Object o, String size) { |
| // should cache the string builder |
| if (o instanceof LauncherAppWidgetProviderInfo) { |
| LauncherAppWidgetProviderInfo info = (LauncherAppWidgetProviderInfo) o; |
| return new WidgetCacheKey(info.provider, mWidgetManager.getUser(info), size); |
| } else { |
| ResolveInfo info = (ResolveInfo) o; |
| return new WidgetCacheKey( |
| new ComponentName(info.activityInfo.packageName, info.activityInfo.name), |
| UserHandleCompat.myUserHandle(), size); |
| } |
| } |
| |
| @Thunk void writeToDb(WidgetCacheKey key, long[] versions, Bitmap preview) { |
| ContentValues values = new ContentValues(); |
| values.put(CacheDb.COLUMN_COMPONENT, key.componentName.flattenToShortString()); |
| values.put(CacheDb.COLUMN_USER, mUserManager.getSerialNumberForUser(key.user)); |
| values.put(CacheDb.COLUMN_SIZE, key.size); |
| values.put(CacheDb.COLUMN_PACKAGE, key.componentName.getPackageName()); |
| values.put(CacheDb.COLUMN_VERSION, versions[0]); |
| values.put(CacheDb.COLUMN_LAST_UPDATED, versions[1]); |
| values.put(CacheDb.COLUMN_PREVIEW_BITMAP, Utilities.flattenBitmap(preview)); |
| mDb.insertOrReplace(values); |
| } |
| |
| public void removePackage(String packageName, UserHandleCompat user) { |
| removePackage(packageName, user, mUserManager.getSerialNumberForUser(user)); |
| } |
| |
| private void removePackage(String packageName, UserHandleCompat user, long userSerial) { |
| synchronized(mPackageVersions) { |
| mPackageVersions.remove(packageName); |
| } |
| |
| mDb.delete( |
| CacheDb.COLUMN_PACKAGE + " = ? AND " + CacheDb.COLUMN_USER + " = ?", |
| new String[]{packageName, Long.toString(userSerial)}); |
| } |
| |
| /** |
| * Updates the persistent DB: |
| * 1. Any preview generated for an old package version is removed |
| * 2. Any preview for an absent package is removed |
| * This ensures that we remove entries for packages which changed while the launcher was dead. |
| */ |
| public void removeObsoletePreviews(ArrayList<Object> list) { |
| Utilities.assertWorkerThread(); |
| |
| LongSparseArray<HashSet<String>> validPackages = new LongSparseArray<>(); |
| |
| for (Object obj : list) { |
| final UserHandleCompat user; |
| final String pkg; |
| if (obj instanceof ResolveInfo) { |
| user = UserHandleCompat.myUserHandle(); |
| pkg = ((ResolveInfo) obj).activityInfo.packageName; |
| } else { |
| LauncherAppWidgetProviderInfo info = (LauncherAppWidgetProviderInfo) obj; |
| user = mWidgetManager.getUser(info); |
| pkg = info.provider.getPackageName(); |
| } |
| |
| final long userId = mUserManager.getSerialNumberForUser(user); |
| HashSet<String> packages = validPackages.get(userId); |
| if (packages == null) { |
| packages = new HashSet<>(); |
| validPackages.put(userId, packages); |
| } |
| packages.add(pkg); |
| } |
| |
| LongSparseArray<HashSet<String>> packagesToDelete = new LongSparseArray<>(); |
| Cursor c = null; |
| try { |
| c = mDb.query( |
| new String[]{CacheDb.COLUMN_USER, CacheDb.COLUMN_PACKAGE, |
| CacheDb.COLUMN_LAST_UPDATED, CacheDb.COLUMN_VERSION}, |
| null, null); |
| while (c.moveToNext()) { |
| long userId = c.getLong(0); |
| String pkg = c.getString(1); |
| long lastUpdated = c.getLong(2); |
| long version = c.getLong(3); |
| |
| HashSet<String> packages = validPackages.get(userId); |
| if (packages != null && packages.contains(pkg)) { |
| long[] versions = getPackageVersion(pkg); |
| if (versions[0] == version && versions[1] == lastUpdated) { |
| // Every thing checks out |
| continue; |
| } |
| } |
| |
| // We need to delete this package. |
| packages = packagesToDelete.get(userId); |
| if (packages == null) { |
| packages = new HashSet<>(); |
| packagesToDelete.put(userId, packages); |
| } |
| packages.add(pkg); |
| } |
| |
| for (int i = 0; i < packagesToDelete.size(); i++) { |
| long userId = packagesToDelete.keyAt(i); |
| UserHandleCompat user = mUserManager.getUserForSerialNumber(userId); |
| for (String pkg : packagesToDelete.valueAt(i)) { |
| removePackage(pkg, user, userId); |
| } |
| } |
| } catch (SQLException e) { |
| Log.e(TAG, "Error updating widget previews", e); |
| } finally { |
| if (c != null) { |
| c.close(); |
| } |
| } |
| } |
| |
| /** |
| * Reads the preview bitmap from the DB or null if the preview is not in the DB. |
| */ |
| @Thunk Bitmap readFromDb(WidgetCacheKey key, Bitmap recycle, PreviewLoadTask loadTask) { |
| Cursor cursor = null; |
| try { |
| cursor = mDb.query( |
| new String[]{CacheDb.COLUMN_PREVIEW_BITMAP}, |
| CacheDb.COLUMN_COMPONENT + " = ? AND " + CacheDb.COLUMN_USER + " = ? AND " |
| + CacheDb.COLUMN_SIZE + " = ?", |
| new String[]{ |
| key.componentName.flattenToString(), |
| Long.toString(mUserManager.getSerialNumberForUser(key.user)), |
| key.size |
| }); |
| // If cancelled, skip getting the blob and decoding it into a bitmap |
| if (loadTask.isCancelled()) { |
| return null; |
| } |
| if (cursor.moveToNext()) { |
| byte[] blob = cursor.getBlob(0); |
| BitmapFactory.Options opts = new BitmapFactory.Options(); |
| opts.inBitmap = recycle; |
| try { |
| if (!loadTask.isCancelled()) { |
| return BitmapFactory.decodeByteArray(blob, 0, blob.length, opts); |
| } |
| } catch (Exception e) { |
| return null; |
| } |
| } |
| } catch (SQLException e) { |
| Log.w(TAG, "Error loading preview from DB", e); |
| } finally { |
| if (cursor != null) { |
| cursor.close(); |
| } |
| } |
| return null; |
| } |
| |
| @Thunk Bitmap generatePreview(Launcher launcher, Object info, Bitmap recycle, |
| int previewWidth, int previewHeight) { |
| if (info instanceof LauncherAppWidgetProviderInfo) { |
| return generateWidgetPreview(launcher, (LauncherAppWidgetProviderInfo) info, |
| previewWidth, recycle, null); |
| } else { |
| return generateShortcutPreview(launcher, |
| (ResolveInfo) info, previewWidth, previewHeight, recycle); |
| } |
| } |
| |
| /** |
| * Generates the widget preview from either the {@link AppWidgetManagerCompat} or cache |
| * and add badge at the bottom right corner. |
| * |
| * @param launcher |
| * @param info information about the widget |
| * @param maxPreviewWidth width of the preview on either workspace or tray |
| * @param preview bitmap that can be recycled |
| * @param preScaledWidthOut return the width of the returned bitmap |
| * @return |
| */ |
| public Bitmap generateWidgetPreview(Launcher launcher, LauncherAppWidgetProviderInfo info, |
| int maxPreviewWidth, Bitmap preview, int[] preScaledWidthOut) { |
| // Load the preview image if possible |
| if (maxPreviewWidth < 0) maxPreviewWidth = Integer.MAX_VALUE; |
| |
| Drawable drawable = null; |
| if (info.previewImage != 0) { |
| drawable = mWidgetManager.loadPreview(info); |
| if (drawable != null) { |
| drawable = mutateOnMainThread(drawable); |
| } else { |
| Log.w(TAG, "Can't load widget preview drawable 0x" + |
| Integer.toHexString(info.previewImage) + " for provider: " + info.provider); |
| } |
| } |
| |
| final boolean widgetPreviewExists = (drawable != null); |
| final int spanX = info.spanX; |
| final int spanY = info.spanY; |
| |
| int previewWidth; |
| int previewHeight; |
| |
| Bitmap tileBitmap = null; |
| |
| if (widgetPreviewExists) { |
| previewWidth = drawable.getIntrinsicWidth(); |
| previewHeight = drawable.getIntrinsicHeight(); |
| } else { |
| // Generate a preview image if we couldn't load one |
| tileBitmap = ((BitmapDrawable) mContext.getResources().getDrawable( |
| R.drawable.widget_tile)).getBitmap(); |
| previewWidth = tileBitmap.getWidth() * spanX; |
| previewHeight = tileBitmap.getHeight() * spanY; |
| } |
| |
| // Scale to fit width only - let the widget preview be clipped in the |
| // vertical dimension |
| float scale = 1f; |
| if (preScaledWidthOut != null) { |
| preScaledWidthOut[0] = previewWidth; |
| } |
| if (previewWidth > maxPreviewWidth) { |
| scale = (maxPreviewWidth - 2 * mProfileBadgeMargin) / (float) (previewWidth); |
| } |
| if (scale != 1f) { |
| previewWidth = (int) (scale * previewWidth); |
| previewHeight = (int) (scale * previewHeight); |
| } |
| |
| // If a bitmap is passed in, we use it; otherwise, we create a bitmap of the right size |
| final Canvas c = new Canvas(); |
| if (preview == null) { |
| preview = Bitmap.createBitmap(previewWidth, previewHeight, Config.ARGB_8888); |
| c.setBitmap(preview); |
| } else { |
| // Reusing bitmap. Clear it. |
| c.setBitmap(preview); |
| c.drawColor(0, PorterDuff.Mode.CLEAR); |
| } |
| |
| // Draw the scaled preview into the final bitmap |
| int x = (preview.getWidth() - previewWidth) / 2; |
| if (widgetPreviewExists) { |
| drawable.setBounds(x, 0, x + previewWidth, previewHeight); |
| drawable.draw(c); |
| } else { |
| final Paint p = new Paint(); |
| p.setFilterBitmap(true); |
| int appIconSize = launcher.getDeviceProfile().iconSizePx; |
| |
| // draw the spanX x spanY tiles |
| final Rect src = new Rect(0, 0, tileBitmap.getWidth(), tileBitmap.getHeight()); |
| |
| float tileW = scale * tileBitmap.getWidth(); |
| float tileH = scale * tileBitmap.getHeight(); |
| final RectF dst = new RectF(0, 0, tileW, tileH); |
| |
| float tx = x; |
| for (int i = 0; i < spanX; i++, tx += tileW) { |
| float ty = 0; |
| for (int j = 0; j < spanY; j++, ty += tileH) { |
| dst.offsetTo(tx, ty); |
| c.drawBitmap(tileBitmap, src, dst, p); |
| } |
| } |
| |
| // Draw the icon in the top left corner |
| // TODO: use top right for RTL |
| int minOffset = (int) (appIconSize * WIDGET_PREVIEW_ICON_PADDING_PERCENTAGE); |
| int smallestSide = Math.min(previewWidth, previewHeight); |
| float iconScale = Math.min((float) smallestSide / (appIconSize + 2 * minOffset), scale); |
| |
| try { |
| Drawable icon = mWidgetManager.loadIcon(info, mIconCache); |
| if (icon != null) { |
| icon = mutateOnMainThread(icon); |
| int hoffset = (int) ((tileW - appIconSize * iconScale) / 2) + x; |
| int yoffset = (int) ((tileH - appIconSize * iconScale) / 2); |
| icon.setBounds(hoffset, yoffset, |
| hoffset + (int) (appIconSize * iconScale), |
| yoffset + (int) (appIconSize * iconScale)); |
| icon.draw(c); |
| } |
| } catch (Resources.NotFoundException e) { |
| } |
| c.setBitmap(null); |
| } |
| int imageWidth = Math.min(preview.getWidth(), previewWidth + mProfileBadgeMargin); |
| int imageHeight = Math.min(preview.getHeight(), previewHeight + mProfileBadgeMargin); |
| return mWidgetManager.getBadgeBitmap(info, preview, imageWidth, imageHeight); |
| } |
| |
| private Bitmap generateShortcutPreview( |
| Launcher launcher, ResolveInfo info, int maxWidth, int maxHeight, Bitmap preview) { |
| final Canvas c = new Canvas(); |
| if (preview == null) { |
| preview = Bitmap.createBitmap(maxWidth, maxHeight, Config.ARGB_8888); |
| c.setBitmap(preview); |
| } else if (preview.getWidth() != maxWidth || preview.getHeight() != maxHeight) { |
| throw new RuntimeException("Improperly sized bitmap passed as argument"); |
| } else { |
| // Reusing bitmap. Clear it. |
| c.setBitmap(preview); |
| c.drawColor(0, PorterDuff.Mode.CLEAR); |
| } |
| |
| Drawable icon = mutateOnMainThread(mIconCache.getFullResIcon(info.activityInfo)); |
| icon.setFilterBitmap(true); |
| |
| // Draw a desaturated/scaled version of the icon in the background as a watermark |
| ColorMatrix colorMatrix = new ColorMatrix(); |
| colorMatrix.setSaturation(0); |
| icon.setColorFilter(new ColorMatrixColorFilter(colorMatrix)); |
| icon.setAlpha((int) (255 * 0.06f)); |
| |
| Resources res = mContext.getResources(); |
| int paddingTop = res.getDimensionPixelOffset(R.dimen.shortcut_preview_padding_top); |
| int paddingLeft = res.getDimensionPixelOffset(R.dimen.shortcut_preview_padding_left); |
| int paddingRight = res.getDimensionPixelOffset(R.dimen.shortcut_preview_padding_right); |
| int scaledIconWidth = (maxWidth - paddingLeft - paddingRight); |
| icon.setBounds(paddingLeft, paddingTop, |
| paddingLeft + scaledIconWidth, paddingTop + scaledIconWidth); |
| icon.draw(c); |
| |
| // Draw the final icon at top left corner. |
| // TODO: use top right for RTL |
| int appIconSize = launcher.getDeviceProfile().iconSizePx; |
| |
| icon.setAlpha(255); |
| icon.setColorFilter(null); |
| icon.setBounds(0, 0, appIconSize, appIconSize); |
| icon.draw(c); |
| |
| c.setBitmap(null); |
| return preview; |
| } |
| |
| private Drawable mutateOnMainThread(final Drawable drawable) { |
| try { |
| return mMainThreadExecutor.submit(new Callable<Drawable>() { |
| @Override |
| public Drawable call() throws Exception { |
| return drawable.mutate(); |
| } |
| }).get(); |
| } catch (InterruptedException e) { |
| Thread.currentThread().interrupt(); |
| throw new RuntimeException(e); |
| } catch (ExecutionException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| /** |
| * @return an array of containing versionCode and lastUpdatedTime for the package. |
| */ |
| @Thunk long[] getPackageVersion(String packageName) { |
| synchronized (mPackageVersions) { |
| long[] versions = mPackageVersions.get(packageName); |
| if (versions == null) { |
| versions = new long[2]; |
| try { |
| PackageInfo info = mContext.getPackageManager().getPackageInfo(packageName, 0); |
| versions[0] = info.versionCode; |
| versions[1] = info.lastUpdateTime; |
| } catch (NameNotFoundException e) { |
| Log.e(TAG, "PackageInfo not found", e); |
| } |
| mPackageVersions.put(packageName, versions); |
| } |
| return versions; |
| } |
| } |
| |
| /** |
| * A request Id which can be used by the client to cancel any request. |
| */ |
| public class PreviewLoadRequest { |
| |
| @Thunk final PreviewLoadTask mTask; |
| |
| public PreviewLoadRequest(PreviewLoadTask task) { |
| mTask = task; |
| } |
| |
| public void cleanup() { |
| if (mTask != null) { |
| mTask.cancel(true); |
| } |
| |
| // This only handles the case where the PreviewLoadTask is cancelled after the task has |
| // successfully completed (including having written to disk when necessary). In the |
| // other cases where it is cancelled while the task is running, it will be cleaned up |
| // in the tasks's onCancelled() call, and if cancelled while the task is writing to |
| // disk, it will be cancelled in the task's onPostExecute() call. |
| if (mTask.mBitmapToRecycle != null) { |
| mWorkerHandler.post(new Runnable() { |
| @Override |
| public void run() { |
| synchronized (mUnusedBitmaps) { |
| mUnusedBitmaps.add(mTask.mBitmapToRecycle); |
| } |
| mTask.mBitmapToRecycle = null; |
| } |
| }); |
| } |
| } |
| } |
| |
| public class PreviewLoadTask extends AsyncTask<Void, Void, Bitmap> { |
| @Thunk final WidgetCacheKey mKey; |
| private final Object mInfo; |
| private final int mPreviewHeight; |
| private final int mPreviewWidth; |
| private final WidgetCell mCaller; |
| @Thunk long[] mVersions; |
| @Thunk Bitmap mBitmapToRecycle; |
| |
| PreviewLoadTask(WidgetCacheKey key, Object info, int previewWidth, |
| int previewHeight, WidgetCell caller) { |
| mKey = key; |
| mInfo = info; |
| mPreviewHeight = previewHeight; |
| mPreviewWidth = previewWidth; |
| mCaller = caller; |
| if (DEBUG) { |
| Log.d(TAG, String.format("%s, %s, %d, %d", |
| mKey, mInfo, mPreviewHeight, mPreviewWidth)); |
| } |
| } |
| |
| @Override |
| protected Bitmap doInBackground(Void... params) { |
| Bitmap unusedBitmap = null; |
| |
| // If already cancelled before this gets to run in the background, then return early |
| if (isCancelled()) { |
| return null; |
| } |
| synchronized (mUnusedBitmaps) { |
| // Check if we can re-use a bitmap |
| for (Bitmap candidate : mUnusedBitmaps) { |
| if (candidate != null && candidate.isMutable() && |
| candidate.getWidth() == mPreviewWidth && |
| candidate.getHeight() == mPreviewHeight) { |
| unusedBitmap = candidate; |
| mUnusedBitmaps.remove(unusedBitmap); |
| break; |
| } |
| } |
| } |
| |
| // creating a bitmap is expensive. Do not do this inside synchronized block. |
| if (unusedBitmap == null) { |
| unusedBitmap = Bitmap.createBitmap(mPreviewWidth, mPreviewHeight, Config.ARGB_8888); |
| } |
| // If cancelled now, don't bother reading the preview from the DB |
| if (isCancelled()) { |
| return unusedBitmap; |
| } |
| Bitmap preview = readFromDb(mKey, unusedBitmap, this); |
| // Only consider generating the preview if we have not cancelled the task already |
| if (!isCancelled() && preview == null) { |
| // Fetch the version info before we generate the preview, so that, in-case the |
| // app was updated while we are generating the preview, we use the old version info, |
| // which would gets re-written next time. |
| mVersions = getPackageVersion(mKey.componentName.getPackageName()); |
| |
| Launcher launcher = (Launcher) mCaller.getContext(); |
| |
| // it's not in the db... we need to generate it |
| preview = generatePreview(launcher, mInfo, unusedBitmap, mPreviewWidth, mPreviewHeight); |
| } |
| return preview; |
| } |
| |
| @Override |
| protected void onPostExecute(final Bitmap preview) { |
| mCaller.applyPreview(preview); |
| |
| // Write the generated preview to the DB in the worker thread |
| if (mVersions != null) { |
| mWorkerHandler.post(new Runnable() { |
| @Override |
| public void run() { |
| if (!isCancelled()) { |
| // If we are still using this preview, then write it to the DB and then |
| // let the normal clear mechanism recycle the bitmap |
| writeToDb(mKey, mVersions, preview); |
| mBitmapToRecycle = preview; |
| } else { |
| // If we've already cancelled, then skip writing the bitmap to the DB |
| // and manually add the bitmap back to the recycled set |
| synchronized (mUnusedBitmaps) { |
| mUnusedBitmaps.add(preview); |
| } |
| } |
| } |
| }); |
| } else { |
| // If we don't need to write to disk, then ensure the preview gets recycled by |
| // the normal clear mechanism |
| mBitmapToRecycle = preview; |
| } |
| } |
| |
| @Override |
| protected void onCancelled(final Bitmap preview) { |
| // If we've cancelled while the task is running, then can return the bitmap to the |
| // recycled set immediately. Otherwise, it will be recycled after the preview is written |
| // to disk. |
| if (preview != null) { |
| mWorkerHandler.post(new Runnable() { |
| @Override |
| public void run() { |
| synchronized (mUnusedBitmaps) { |
| mUnusedBitmaps.add(preview); |
| } |
| } |
| }); |
| } |
| } |
| } |
| |
| private static final class WidgetCacheKey extends ComponentKey { |
| |
| // TODO: remove dependency on size |
| @Thunk final String size; |
| |
| public WidgetCacheKey(ComponentName componentName, UserHandleCompat user, String size) { |
| super(componentName, user); |
| this.size = size; |
| } |
| |
| @Override |
| public int hashCode() { |
| return super.hashCode() ^ size.hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| return super.equals(o) && ((WidgetCacheKey) o).size.equals(size); |
| } |
| } |
| } |
