29 三级缓存案例

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LRU:least rencently used 最近最少使用

LruCache 会在内存不足的杀死最近不常用的资源

package com.qf.sxy.day30_cache.utils;import android.content.Context;import android.graphics.Bitmap;import android.util.Log;import android.util.LruCache;import com.qf.sxy.day30_cache.asynctask.DownLoadImage;import com.qf.sxy.day30_cache.interfacecallback.ImageCallBack;/** * Created by sxy on 2016/9/30. * 进行缓存和处理图片 */public class LruCacheUtils {    //Lru缓存    private LruCache<String,Bitmap> cache;    private  Context context;    private ImageCallBack imageCallBack;    public LruCacheUtils(Context context,ImageCallBack imageCallBack){        this.context = context;        this.imageCallBack = imageCallBack;        //运行时内存的1/8大小        long maxMemory = Runtime.getRuntime().maxMemory();        int maxSize =(int)(maxMemory/8);        cache = new LruCache<String,Bitmap>(maxSize){            //返回图片的大小            @Override            protected int sizeOf(String key, Bitmap value) {                return value.getByteCount();            }        };    }    //获取图片    public Bitmap getBitmap(String key){        //从缓存中找        Bitmap bitmap = cache.get(key);        if (bitmap!=null){            Log.e("AA","==Lru==");            return bitmap;        }else{            //从Sd找            bitmap = Utils.getBitmapFromSD(key,context);            if (bitmap!=null){                Log.e("AA","==SD==");                //存到缓存                cache.put(key,bitmap);                return bitmap;            }else{                Log.e("AA","==NET==");                //下载图片                new DownLoadImage(context,cache,imageCallBack).execute(key);            }        }        return null;    }}

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