package com.android.launcher3;
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import android.content.ComponentName;
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import android.content.ContentValues;
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import android.content.Context;
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import android.content.pm.PackageInfo;
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import android.content.pm.PackageManager;
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import android.content.pm.PackageManager.NameNotFoundException;
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import android.content.res.Resources;
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import android.database.Cursor;
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import android.database.SQLException;
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import android.database.sqlite.SQLiteDatabase;
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import android.graphics.Bitmap;
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import android.graphics.Bitmap.Config;
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import android.graphics.BitmapFactory;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.graphics.PorterDuff;
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import android.graphics.PorterDuffXfermode;
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import android.graphics.Rect;
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import android.graphics.RectF;
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import android.graphics.drawable.Drawable;
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import android.os.AsyncTask;
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import android.os.CancellationSignal;
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import android.os.Handler;
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import android.os.Process;
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import android.os.UserHandle;
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import android.util.Log;
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import android.util.LongSparseArray;
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import com.android.launcher3.compat.AppWidgetManagerCompat;
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import com.android.launcher3.compat.ShortcutConfigActivityInfo;
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import com.android.launcher3.compat.UserManagerCompat;
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import com.android.launcher3.icons.GraphicsUtils;
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import com.android.launcher3.icons.LauncherIcons;
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import com.android.launcher3.icons.ShadowGenerator;
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import com.android.launcher3.icons.IconCache;
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import com.android.launcher3.model.WidgetItem;
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import com.android.launcher3.util.ComponentKey;
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import com.android.launcher3.util.PackageUserKey;
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import com.android.launcher3.util.Preconditions;
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import com.android.launcher3.util.SQLiteCacheHelper;
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import com.android.launcher3.util.Thunk;
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import com.android.launcher3.widget.WidgetCell;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.WeakHashMap;
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import java.util.concurrent.Callable;
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import java.util.concurrent.ExecutionException;
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import androidx.annotation.Nullable;
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public class WidgetPreviewLoader {
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private static final String TAG = "WidgetPreviewLoader";
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private static final boolean DEBUG = false;
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private final HashMap<String, long[]> mPackageVersions = new HashMap<>();
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/**
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* Weak reference objects, do not prevent their referents from being made finalizable,
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* finalized, and then reclaimed.
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* Note: synchronized block used for this variable is expensive and the block should always
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* be posted to a background thread.
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*/
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@Thunk final Set<Bitmap> mUnusedBitmaps =
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Collections.newSetFromMap(new WeakHashMap<Bitmap, Boolean>());
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private final Context mContext;
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private final IconCache mIconCache;
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private final UserManagerCompat mUserManager;
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private final CacheDb mDb;
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private final MainThreadExecutor mMainThreadExecutor = new MainThreadExecutor();
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@Thunk final Handler mWorkerHandler;
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public WidgetPreviewLoader(Context context, IconCache iconCache) {
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mContext = context;
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mIconCache = iconCache;
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mUserManager = UserManagerCompat.getInstance(context);
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mDb = new CacheDb(context);
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mWorkerHandler = new Handler(LauncherModel.getWorkerLooper());
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}
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/**
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* Generates the widget preview on {@link AsyncTask#THREAD_POOL_EXECUTOR}. Must be
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* called on UI thread
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*
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* @return a request id which can be used to cancel the request.
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*/
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public CancellationSignal getPreview(WidgetItem item, int previewWidth,
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int previewHeight, WidgetCell caller) {
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String size = previewWidth + "x" + previewHeight;
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WidgetCacheKey key = new WidgetCacheKey(item.componentName, item.user, size);
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PreviewLoadTask task = new PreviewLoadTask(key, item, previewWidth, previewHeight, caller);
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task.executeOnExecutor(Utilities.THREAD_POOL_EXECUTOR);
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CancellationSignal signal = new CancellationSignal();
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signal.setOnCancelListener(task);
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return signal;
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}
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public void refresh() {
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mDb.clear();
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}
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/**
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* The DB holds the generated previews for various components. Previews can also have different
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* sizes (landscape vs portrait).
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*/
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private static class CacheDb extends SQLiteCacheHelper {
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private static final int DB_VERSION = 9;
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private static final String TABLE_NAME = "shortcut_and_widget_previews";
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private static final String COLUMN_COMPONENT = "componentName";
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private static final String COLUMN_USER = "profileId";
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private static final String COLUMN_SIZE = "size";
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private static final String COLUMN_PACKAGE = "packageName";
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private static final String COLUMN_LAST_UPDATED = "lastUpdated";
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private static final String COLUMN_VERSION = "version";
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private static final String COLUMN_PREVIEW_BITMAP = "preview_bitmap";
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public CacheDb(Context context) {
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super(context, LauncherFiles.WIDGET_PREVIEWS_DB, DB_VERSION, TABLE_NAME);
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}
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@Override
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public void onCreateTable(SQLiteDatabase database) {
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database.execSQL("CREATE TABLE IF NOT EXISTS " + TABLE_NAME + " (" +
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COLUMN_COMPONENT + " TEXT NOT NULL, " +
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COLUMN_USER + " INTEGER NOT NULL, " +
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COLUMN_SIZE + " TEXT NOT NULL, " +
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COLUMN_PACKAGE + " TEXT NOT NULL, " +
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COLUMN_LAST_UPDATED + " INTEGER NOT NULL DEFAULT 0, " +
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COLUMN_VERSION + " INTEGER NOT NULL DEFAULT 0, " +
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COLUMN_PREVIEW_BITMAP + " BLOB, " +
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"PRIMARY KEY (" + COLUMN_COMPONENT + ", " + COLUMN_USER + ", " + COLUMN_SIZE + ") " +
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");");
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}
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}
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@Thunk void writeToDb(WidgetCacheKey key, long[] versions, Bitmap preview) {
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ContentValues values = new ContentValues();
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values.put(CacheDb.COLUMN_COMPONENT, key.componentName.flattenToShortString());
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values.put(CacheDb.COLUMN_USER, mUserManager.getSerialNumberForUser(key.user));
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values.put(CacheDb.COLUMN_SIZE, key.size);
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values.put(CacheDb.COLUMN_PACKAGE, key.componentName.getPackageName());
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values.put(CacheDb.COLUMN_VERSION, versions[0]);
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values.put(CacheDb.COLUMN_LAST_UPDATED, versions[1]);
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values.put(CacheDb.COLUMN_PREVIEW_BITMAP, GraphicsUtils.flattenBitmap(preview));
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mDb.insertOrReplace(values);
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}
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public void removePackage(String packageName, UserHandle user) {
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removePackage(packageName, user, mUserManager.getSerialNumberForUser(user));
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}
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private void removePackage(String packageName, UserHandle user, long userSerial) {
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synchronized(mPackageVersions) {
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mPackageVersions.remove(packageName);
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}
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mDb.delete(
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CacheDb.COLUMN_PACKAGE + " = ? AND " + CacheDb.COLUMN_USER + " = ?",
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new String[]{packageName, Long.toString(userSerial)});
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}
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/**
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* Updates the persistent DB:
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* 1. Any preview generated for an old package version is removed
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* 2. Any preview for an absent package is removed
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* This ensures that we remove entries for packages which changed while the launcher was dead.
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*
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* @param packageUser if provided, specifies that list only contains previews for the
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* given package/user, otherwise the list contains all previews
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*/
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public void removeObsoletePreviews(ArrayList<? extends ComponentKey> list,
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@Nullable PackageUserKey packageUser) {
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Preconditions.assertWorkerThread();
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LongSparseArray<HashSet<String>> validPackages = new LongSparseArray<>();
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for (ComponentKey key : list) {
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final long userId = mUserManager.getSerialNumberForUser(key.user);
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HashSet<String> packages = validPackages.get(userId);
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if (packages == null) {
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packages = new HashSet<>();
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validPackages.put(userId, packages);
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}
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packages.add(key.componentName.getPackageName());
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}
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LongSparseArray<HashSet<String>> packagesToDelete = new LongSparseArray<>();
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long passedUserId = packageUser == null ? 0
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: mUserManager.getSerialNumberForUser(packageUser.mUser);
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Cursor c = null;
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try {
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c = mDb.query(
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new String[]{CacheDb.COLUMN_USER, CacheDb.COLUMN_PACKAGE,
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CacheDb.COLUMN_LAST_UPDATED, CacheDb.COLUMN_VERSION},
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null, null);
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while (c.moveToNext()) {
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long userId = c.getLong(0);
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String pkg = c.getString(1);
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long lastUpdated = c.getLong(2);
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long version = c.getLong(3);
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if (packageUser != null && (!pkg.equals(packageUser.mPackageName)
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|| userId != passedUserId)) {
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// This preview is associated with a different package/user, no need to remove.
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continue;
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}
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HashSet<String> packages = validPackages.get(userId);
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if (packages != null && packages.contains(pkg)) {
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long[] versions = getPackageVersion(pkg);
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if (versions[0] == version && versions[1] == lastUpdated) {
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// Every thing checks out
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continue;
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}
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}
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// We need to delete this package.
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packages = packagesToDelete.get(userId);
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if (packages == null) {
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packages = new HashSet<>();
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packagesToDelete.put(userId, packages);
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}
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packages.add(pkg);
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}
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for (int i = 0; i < packagesToDelete.size(); i++) {
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long userId = packagesToDelete.keyAt(i);
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UserHandle user = mUserManager.getUserForSerialNumber(userId);
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for (String pkg : packagesToDelete.valueAt(i)) {
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removePackage(pkg, user, userId);
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}
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}
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} catch (SQLException e) {
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Log.e(TAG, "Error updating widget previews", e);
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} finally {
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if (c != null) {
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c.close();
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}
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}
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}
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/**
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* Reads the preview bitmap from the DB or null if the preview is not in the DB.
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*/
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@Thunk Bitmap readFromDb(WidgetCacheKey key, Bitmap recycle, PreviewLoadTask loadTask) {
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Cursor cursor = null;
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try {
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cursor = mDb.query(
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new String[]{CacheDb.COLUMN_PREVIEW_BITMAP},
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CacheDb.COLUMN_COMPONENT + " = ? AND " + CacheDb.COLUMN_USER + " = ? AND "
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+ CacheDb.COLUMN_SIZE + " = ?",
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new String[]{
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key.componentName.flattenToShortString(),
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Long.toString(mUserManager.getSerialNumberForUser(key.user)),
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key.size
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});
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// If cancelled, skip getting the blob and decoding it into a bitmap
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if (loadTask.isCancelled()) {
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return null;
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}
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if (cursor.moveToNext()) {
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byte[] blob = cursor.getBlob(0);
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BitmapFactory.Options opts = new BitmapFactory.Options();
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opts.inBitmap = recycle;
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try {
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if (!loadTask.isCancelled()) {
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return BitmapFactory.decodeByteArray(blob, 0, blob.length, opts);
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}
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} catch (Exception e) {
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return null;
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}
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}
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} catch (SQLException e) {
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Log.w(TAG, "Error loading preview from DB", e);
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} finally {
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if (cursor != null) {
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cursor.close();
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}
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}
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return null;
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}
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private Bitmap generatePreview(BaseActivity launcher, WidgetItem item, Bitmap recycle,
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int previewWidth, int previewHeight) {
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if (item.widgetInfo != null) {
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return generateWidgetPreview(launcher, item.widgetInfo,
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previewWidth, recycle, null);
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} else {
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return generateShortcutPreview(launcher, item.activityInfo,
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previewWidth, previewHeight, recycle);
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}
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}
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/**
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* Generates the widget preview from either the {@link AppWidgetManagerCompat} or cache
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* and add badge at the bottom right corner.
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*
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* @param launcher
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* @param info information about the widget
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* @param maxPreviewWidth width of the preview on either workspace or tray
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* @param preview bitmap that can be recycled
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* @param preScaledWidthOut return the width of the returned bitmap
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* @return
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*/
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public Bitmap generateWidgetPreview(BaseActivity launcher, LauncherAppWidgetProviderInfo info,
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int maxPreviewWidth, Bitmap preview, int[] preScaledWidthOut) {
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// Load the preview image if possible
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if (maxPreviewWidth < 0) maxPreviewWidth = Integer.MAX_VALUE;
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Drawable drawable = null;
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if (info.previewImage != 0) {
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try {
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drawable = info.loadPreviewImage(mContext, 0);
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} catch (OutOfMemoryError e) {
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Log.w(TAG, "Error loading widget preview for: " + info.provider, e);
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// During OutOfMemoryError, the previous heap stack is not affected. Catching
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// an OOM error here should be safe & not affect other parts of launcher.
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drawable = null;
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}
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if (drawable != null) {
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drawable = mutateOnMainThread(drawable);
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} else {
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Log.w(TAG, "Can't load widget preview drawable 0x" +
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Integer.toHexString(info.previewImage) + " for provider: " + info.provider);
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}
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}
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final boolean widgetPreviewExists = (drawable != null);
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final int spanX = info.spanX;
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final int spanY = info.spanY;
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int previewWidth;
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int previewHeight;
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if (widgetPreviewExists && drawable.getIntrinsicWidth() > 0
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&& drawable.getIntrinsicHeight() > 0) {
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previewWidth = drawable.getIntrinsicWidth();
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previewHeight = drawable.getIntrinsicHeight();
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} else {
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DeviceProfile dp = launcher.getDeviceProfile();
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int tileSize = Math.min(dp.cellWidthPx, dp.cellHeightPx);
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previewWidth = tileSize * spanX;
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previewHeight = tileSize * spanY;
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}
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// Scale to fit width only - let the widget preview be clipped in the
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// vertical dimension
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float scale = 1f;
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if (preScaledWidthOut != null) {
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preScaledWidthOut[0] = previewWidth;
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}
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if (previewWidth > maxPreviewWidth) {
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scale = maxPreviewWidth / (float) (previewWidth);
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}
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if (scale != 1f) {
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previewWidth = Math.max((int)(scale * previewWidth), 1);
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previewHeight = Math.max((int)(scale * previewHeight), 1);
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}
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// If a bitmap is passed in, we use it; otherwise, we create a bitmap of the right size
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final Canvas c = new Canvas();
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if (preview == null) {
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preview = Bitmap.createBitmap(previewWidth, previewHeight, Config.ARGB_8888);
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c.setBitmap(preview);
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} else {
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// We use the preview bitmap height to determine where the badge will be drawn in the
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// UI. If its larger than what we need, resize the preview bitmap so that there are
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// no transparent pixels between the preview and the badge.
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if (preview.getHeight() > previewHeight) {
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preview.reconfigure(preview.getWidth(), previewHeight, preview.getConfig());
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}
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// Reusing bitmap. Clear it.
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c.setBitmap(preview);
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c.drawColor(0, PorterDuff.Mode.CLEAR);
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}
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// Draw the scaled preview into the final bitmap
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int x = (preview.getWidth() - previewWidth) / 2;
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if (widgetPreviewExists) {
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drawable.setBounds(x, 0, x + previewWidth, previewHeight);
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drawable.draw(c);
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} else {
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RectF boxRect = drawBoxWithShadow(c, previewWidth, previewHeight);
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// Draw horizontal and vertical lines to represent individual columns.
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final Paint p = new Paint(Paint.ANTI_ALIAS_FLAG);
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p.setStyle(Paint.Style.STROKE);
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p.setStrokeWidth(mContext.getResources()
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.getDimension(R.dimen.widget_preview_cell_divider_width));
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p.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
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float t = boxRect.left;
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float tileSize = boxRect.width() / spanX;
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for (int i = 1; i < spanX; i++) {
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t += tileSize;
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c.drawLine(t, 0, t, previewHeight, p);
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}
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t = boxRect.top;
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tileSize = boxRect.height() / spanY;
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for (int i = 1; i < spanY; i++) {
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t += tileSize;
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c.drawLine(0, t, previewWidth, t, p);
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}
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// Draw icon in the center.
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try {
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Drawable icon =
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mIconCache.getFullResIcon(info.provider.getPackageName(), info.icon);
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if (icon != null) {
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int appIconSize = launcher.getDeviceProfile().iconSizePx;
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int iconSize = (int) Math.min(appIconSize * scale,
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Math.min(boxRect.width(), boxRect.height()));
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icon = mutateOnMainThread(icon);
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int hoffset = (previewWidth - iconSize) / 2;
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int yoffset = (previewHeight - iconSize) / 2;
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icon.setBounds(hoffset, yoffset, hoffset + iconSize, yoffset + iconSize);
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icon.draw(c);
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}
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} catch (Resources.NotFoundException e) { }
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c.setBitmap(null);
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}
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return preview;
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}
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private RectF drawBoxWithShadow(Canvas c, int width, int height) {
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Resources res = mContext.getResources();
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ShadowGenerator.Builder builder = new ShadowGenerator.Builder(Color.WHITE);
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builder.shadowBlur = res.getDimension(R.dimen.widget_preview_shadow_blur);
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builder.radius = res.getDimension(R.dimen.widget_preview_corner_radius);
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builder.keyShadowDistance = res.getDimension(R.dimen.widget_preview_key_shadow_distance);
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builder.bounds.set(builder.shadowBlur, builder.shadowBlur,
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width - builder.shadowBlur,
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height - builder.shadowBlur - builder.keyShadowDistance);
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builder.drawShadow(c);
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return builder.bounds;
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}
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private Bitmap generateShortcutPreview(BaseActivity launcher, ShortcutConfigActivityInfo info,
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int maxWidth, int maxHeight, Bitmap preview) {
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int iconSize = launcher.getDeviceProfile().iconSizePx;
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int padding = launcher.getResources()
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.getDimensionPixelSize(R.dimen.widget_preview_shortcut_padding);
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int size = iconSize + 2 * padding;
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if (maxHeight < size || maxWidth < size) {
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throw new RuntimeException("Max size is too small for preview");
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}
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final Canvas c = new Canvas();
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if (preview == null || preview.getWidth() < size || preview.getHeight() < size) {
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preview = Bitmap.createBitmap(size, size, Config.ARGB_8888);
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c.setBitmap(preview);
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} else {
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if (preview.getWidth() > size || preview.getHeight() > size) {
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preview.reconfigure(size, size, preview.getConfig());
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}
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// Reusing bitmap. Clear it.
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c.setBitmap(preview);
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c.drawColor(0, PorterDuff.Mode.CLEAR);
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}
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RectF boxRect = drawBoxWithShadow(c, size, size);
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LauncherIcons li = LauncherIcons.obtain(mContext);
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Bitmap icon = li.createBadgedIconBitmap(
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mutateOnMainThread(info.getFullResIcon(mIconCache)),
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Process.myUserHandle(), 0).icon;
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li.recycle();
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Rect src = new Rect(0, 0, icon.getWidth(), icon.getHeight());
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boxRect.set(0, 0, iconSize, iconSize);
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boxRect.offset(padding, padding);
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c.drawBitmap(icon, src, boxRect,
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new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG));
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c.setBitmap(null);
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return preview;
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}
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private Drawable mutateOnMainThread(final Drawable drawable) {
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try {
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return mMainThreadExecutor.submit(new Callable<Drawable>() {
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@Override
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public Drawable call() throws Exception {
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return drawable.mutate();
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}
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}).get();
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} catch (InterruptedException e) {
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Thread.currentThread().interrupt();
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throw new RuntimeException(e);
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} catch (ExecutionException e) {
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throw new RuntimeException(e);
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}
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}
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/**
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* @return an array of containing versionCode and lastUpdatedTime for the package.
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*/
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@Thunk long[] getPackageVersion(String packageName) {
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synchronized (mPackageVersions) {
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long[] versions = mPackageVersions.get(packageName);
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if (versions == null) {
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versions = new long[2];
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try {
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PackageInfo info = mContext.getPackageManager().getPackageInfo(packageName,
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PackageManager.GET_UNINSTALLED_PACKAGES);
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versions[0] = info.versionCode;
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versions[1] = info.lastUpdateTime;
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} catch (NameNotFoundException e) {
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Log.e(TAG, "PackageInfo not found", e);
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}
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mPackageVersions.put(packageName, versions);
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}
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return versions;
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}
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}
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public class PreviewLoadTask extends AsyncTask<Void, Void, Bitmap>
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implements CancellationSignal.OnCancelListener {
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@Thunk final WidgetCacheKey mKey;
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private final WidgetItem mInfo;
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private final int mPreviewHeight;
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private final int mPreviewWidth;
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private final WidgetCell mCaller;
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private final BaseActivity mActivity;
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@Thunk long[] mVersions;
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@Thunk Bitmap mBitmapToRecycle;
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PreviewLoadTask(WidgetCacheKey key, WidgetItem info, int previewWidth,
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int previewHeight, WidgetCell caller) {
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mKey = key;
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mInfo = info;
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mPreviewHeight = previewHeight;
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mPreviewWidth = previewWidth;
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mCaller = caller;
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mActivity = BaseActivity.fromContext(mCaller.getContext());
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if (DEBUG) {
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Log.d(TAG, String.format("%s, %s, %d, %d",
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mKey, mInfo, mPreviewHeight, mPreviewWidth));
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}
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}
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@Override
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protected Bitmap doInBackground(Void... params) {
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Bitmap unusedBitmap = null;
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// If already cancelled before this gets to run in the background, then return early
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if (isCancelled()) {
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return null;
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}
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synchronized (mUnusedBitmaps) {
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// Check if we can re-use a bitmap
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for (Bitmap candidate : mUnusedBitmaps) {
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if (candidate != null && candidate.isMutable() &&
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candidate.getWidth() == mPreviewWidth &&
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candidate.getHeight() == mPreviewHeight) {
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unusedBitmap = candidate;
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mUnusedBitmaps.remove(unusedBitmap);
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break;
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}
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}
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}
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// creating a bitmap is expensive. Do not do this inside synchronized block.
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if (unusedBitmap == null) {
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unusedBitmap = Bitmap.createBitmap(mPreviewWidth, mPreviewHeight, Config.ARGB_8888);
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}
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// If cancelled now, don't bother reading the preview from the DB
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if (isCancelled()) {
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return unusedBitmap;
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}
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Bitmap preview = readFromDb(mKey, unusedBitmap, this);
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// Only consider generating the preview if we have not cancelled the task already
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if (!isCancelled() && preview == null) {
|
// Fetch the version info before we generate the preview, so that, in-case the
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// app was updated while we are generating the preview, we use the old version info,
|
// which would gets re-written next time.
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boolean persistable = mInfo.activityInfo == null
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|| mInfo.activityInfo.isPersistable();
|
mVersions = persistable ? getPackageVersion(mKey.componentName.getPackageName())
|
: null;
|
|
// it's not in the db... we need to generate it
|
preview = generatePreview(mActivity, 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);
|
}
|
}
|
});
|
}
|
}
|
|
@Override
|
public void onCancel() {
|
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 (mBitmapToRecycle != null) {
|
mWorkerHandler.post(new Runnable() {
|
@Override
|
public void run() {
|
synchronized (mUnusedBitmaps) {
|
mUnusedBitmaps.add(mBitmapToRecycle);
|
}
|
mBitmapToRecycle = null;
|
}
|
});
|
}
|
}
|
}
|
|
private static final class WidgetCacheKey extends ComponentKey {
|
|
@Thunk final String size;
|
|
public WidgetCacheKey(ComponentName componentName, UserHandle 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);
|
}
|
}
|
}
|
