线程池+缓存+Handler 异步加载网络图片，,import java.

线程池+缓存+Handler 异步加载网络图片，,import java.

import java.lang.ref.SoftReference;import java.net.URL;import java.util.HashMap;import java.util.Map;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import android.graphics.drawable.Drawable;import android.os.Handler;import android.util.Log;/*** 线程池+缓存+Handler加载图片*/public class AsyncLoadImage {    //缓存    private Map<String, SoftReference<Drawable>> imageCache = new HashMap<String, SoftReference<Drawable>>();    //线程池    private ExecutorService executorService = Executors.newFixedThreadPool(20);//总共有10个线程循环使用    //Hanlder    private Handler mHandler = new Handler();    public interface ImageCallback {        void imageLoad(Drawable image, String imageUrl);    }    /**     *     * @param imageUrl 图片的地址     * @param imageCallback 回调接口     * @return 返回内存中缓存的图像 第一次返回null     */    public Drawable loadDrawable(final String imageUrl, final ImageCallback imageCallback) {        Log.i("AsyncLoadImage", "loadDrawable()" + imageUrl);        //如果缓存中有则从缓存中取出来        if(imageCache.containsKey(imageUrl)) {            SoftReference<Drawable> softReference = imageCache.get(imageUrl);            if(softReference.get() != null) { //判断是否有drawable                return softReference.get(); //有则返回            }        }        //使用线程池下载图片        executorService.submit(new Runnable() {            @Override            public void run() {                try {                    //                                        final Drawable drawable = Drawable.createFromStream(new URL(imageUrl).openStream(), "image.jpg");                    final Drawable drawable = getDrawableFormUrl(imageUrl); //调用获取数据的方法                    imageCache.put(imageUrl, new SoftReference<Drawable>(drawable));//将加载的图片放入到内存中                    mHandler.post(new Runnable() {                        @Override                        public void run() {                            imageCallback.imageLoad(drawable, imageUrl); //接口回调                        }                    });                } catch (Exception e) {                    throw new RuntimeException();                }            }        });        return null ;    }    /**     * 从网络上获取数据     */    public Drawable getDrawableFormUrl(String imageUrl) {        Drawable drawable = null ;        try {            drawable = Drawable.createFromStream(new URL(imageUrl).openStream(), "image.jpg");        } catch (Exception e) {            throw new RuntimeException();        }        return drawable ;    }}