/* * Copyright (C) 2013 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 lb.listviewvariants.utils; import android.graphics.Bitmap; import android.os.Build; import android.support.v4.util.LruCache; import android.util.Log; import lb.listviewvariants.BuildConfig; /** * This class holds our bitmap caches (memory and disk). */ public class ImageCache { private static final float CACHE_PERCENTAGE=0.1f; private static final String TAG="ImageCache"; private LruCache<String,Bitmap> mMemoryCache; public static final ImageCache INSTANCE=new ImageCache(CACHE_PERCENTAGE); private ImageCache(float memCacheSizePercent) { init(memCacheSizePercent); } private void init(float memCacheSizePercent) { int memCacheSize=calculateMemCacheSize(memCacheSizePercent); // Set up memory cache if(BuildConfig.DEBUG) Log.d(TAG,"Memory cache created (size = "+memCacheSize+")"); mMemoryCache=new LruCache<String,Bitmap>(memCacheSize) { @Override protected int sizeOf(String key,Bitmap bitmap) { final int bitmapSize=getBitmapSize(bitmap)/1024; return bitmapSize==0?1:bitmapSize; } }; } public void addBitmapToCache(String data,Bitmap bitmap) { if(data==null||bitmap==null) return; // Add to memory cache if(mMemoryCache!=null&&mMemoryCache.get(data)==null) mMemoryCache.put(data,bitmap); } public Bitmap getBitmapFromMemCache(String data) { if(mMemoryCache!=null) { final Bitmap memBitmap=mMemoryCache.get(data); if(memBitmap!=null) { if(BuildConfig.DEBUG) Log.d(TAG,"Memory cache hit"); return memBitmap; } } return null; } public static int getBitmapSize(Bitmap bitmap) { if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.HONEYCOMB_MR1) return bitmap.getByteCount(); // Pre HC-MR1 return bitmap.getRowBytes()*bitmap.getHeight(); } public static int calculateMemCacheSize(float percent) { if(percent<0.05f||percent>0.8f) { throw new IllegalArgumentException("setMemCacheSizePercent - percent must be " +"between 0.05 and 0.8 (inclusive)"); } return Math.round(percent*Runtime.getRuntime().maxMemory()/1024); } }