| /* |
| * Copyright (C) 2022 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.settingslib.applications; |
| |
| import android.graphics.drawable.BitmapDrawable; |
| import android.graphics.drawable.Drawable; |
| import android.os.UserHandle; |
| import android.util.Log; |
| import android.util.LruCache; |
| |
| import androidx.annotation.VisibleForTesting; |
| |
| /** |
| * Cache app icon for management. |
| */ |
| public class AppIconCacheManager { |
| private static final String TAG = "AppIconCacheManager"; |
| private static final float CACHE_RATIO = 0.1f; |
| @VisibleForTesting |
| static final int MAX_CACHE_SIZE_IN_KB = getMaxCacheInKb(); |
| private static final String DELIMITER = ":"; |
| private static AppIconCacheManager sAppIconCacheManager; |
| private final LruCache<String, Drawable> mDrawableCache; |
| |
| private AppIconCacheManager() { |
| mDrawableCache = new LruCache<String, Drawable>(MAX_CACHE_SIZE_IN_KB) { |
| @Override |
| protected int sizeOf(String key, Drawable drawable) { |
| if (drawable instanceof BitmapDrawable) { |
| return ((BitmapDrawable) drawable).getBitmap().getByteCount() / 1024; |
| } |
| // Rough estimate each pixel will use 4 bytes by default. |
| return drawable.getIntrinsicHeight() * drawable.getIntrinsicWidth() * 4 / 1024; |
| } |
| }; |
| } |
| |
| /** |
| * Get an {@link AppIconCacheManager} instance. |
| */ |
| public static synchronized AppIconCacheManager getInstance() { |
| if (sAppIconCacheManager == null) { |
| sAppIconCacheManager = new AppIconCacheManager(); |
| } |
| return sAppIconCacheManager; |
| } |
| |
| /** |
| * Put app icon to cache |
| * |
| * @param packageName of icon |
| * @param uid of packageName |
| * @param drawable app icon |
| */ |
| public void put(String packageName, int uid, Drawable drawable) { |
| final String key = getKey(packageName, uid); |
| if (key == null || drawable == null || drawable.getIntrinsicHeight() < 0 |
| || drawable.getIntrinsicWidth() < 0) { |
| Log.w(TAG, "Invalid key or drawable."); |
| return; |
| } |
| mDrawableCache.put(key, drawable); |
| } |
| |
| /** |
| * Get app icon from cache. |
| * |
| * @param packageName of icon |
| * @param uid of packageName |
| * @return app icon |
| */ |
| public Drawable get(String packageName, int uid) { |
| final String key = getKey(packageName, uid); |
| if (key == null) { |
| Log.w(TAG, "Invalid key with package or uid."); |
| return null; |
| } |
| final Drawable cachedDrawable = mDrawableCache.get(key); |
| return cachedDrawable != null ? cachedDrawable.mutate() : null; |
| } |
| |
| /** |
| * Release cache. |
| */ |
| public static void release() { |
| if (sAppIconCacheManager != null) { |
| sAppIconCacheManager.mDrawableCache.evictAll(); |
| } |
| } |
| |
| private static String getKey(String packageName, int uid) { |
| if (packageName == null || uid < 0) { |
| return null; |
| } |
| return packageName + DELIMITER + UserHandle.getUserId(uid); |
| } |
| |
| private static int getMaxCacheInKb() { |
| return Math.round(CACHE_RATIO * Runtime.getRuntime().maxMemory() / 1024); |
| } |
| |
| /** |
| * Clears as much memory as possible. |
| * |
| * @see android.content.ComponentCallbacks2#onTrimMemory(int) |
| */ |
| public void trimMemory(int level) { |
| if (level >= android.content.ComponentCallbacks2.TRIM_MEMORY_BACKGROUND) { |
| // Time to clear everything |
| if (sAppIconCacheManager != null) { |
| sAppIconCacheManager.mDrawableCache.trimToSize(0); |
| } |
| } else if (level >= android.content.ComponentCallbacks2.TRIM_MEMORY_UI_HIDDEN |
| || level == android.content.ComponentCallbacks2.TRIM_MEMORY_RUNNING_CRITICAL) { |
| // Tough time but still affordable, clear half of the cache |
| if (sAppIconCacheManager != null) { |
| final int maxSize = sAppIconCacheManager.mDrawableCache.maxSize(); |
| sAppIconCacheManager.mDrawableCache.trimToSize(maxSize / 2); |
| } |
| } |
| } |
| } |