com.dp.chapter01.part2.cache.MemoryCache.java Source code

Introduction

Here is the source code for com.dp.chapter01.part2.cache.MemoryCache.java

Source

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2015 Umeng, Inc
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.dp.chapter01.part2.cache;

import android.graphics.Bitmap;
import android.support.v4.util.LruCache;

/**
 * , (LRU).
 * 
 */
public class MemoryCache {
    // LRU
    private LruCache<String, Bitmap> mMemeryCache;

    public MemoryCache() {
        // ?
        final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
        // ?4?
        final int cacheSize = maxMemory / 4;
        mMemeryCache = new LruCache<String, Bitmap>(cacheSize) {

            @Override
            protected int sizeOf(String key, Bitmap bitmap) {
                return bitmap.getRowBytes() * bitmap.getHeight() / 1024;
            }
        };

    }

    // ?
    public Bitmap get(String url) {
        return mMemeryCache.get(url);
    }

    // 
    public void put(String url, Bitmap bmp) {
        mMemeryCache.put(url, bmp);
    }
}