Java tutorial
/* * Copyright (C) 2015 Federico Iosue (federico.iosue@gmail.com) * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package it.feio.android.omninotes.models; import android.graphics.Bitmap; import android.support.v4.util.LruCache; public class ThumbnailLruCache extends LruCache<String, Bitmap> { // Calculates available device memory final static int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024); // Use 1/8th of the available memory for this memory cache. final static int cacheSize = maxMemory / 8; private static ThumbnailLruCache instance = null; private static LruCache<String, Bitmap> mMemoryCache; public ThumbnailLruCache(int maxSize) { super(maxSize); } public static synchronized ThumbnailLruCache getInstance() { if (instance == null) { instance = new ThumbnailLruCache(cacheSize); } mMemoryCache = new LruCache<>(cacheSize); return instance; } public void addBitmap(String key, Bitmap bitmap) { if (getBitmap(key) == null) { mMemoryCache.put(key, bitmap); } } public Bitmap getBitmap(String key) { return mMemoryCache.get(key); } }