对于Android中的异步加载图片，自己总结了两种方式，如下：

1.

/* * 异步读取图片，需要传递三个参数：Imageview imageView,String imagePath,int maxNumpixels * @author Bryant / public class AsyncLoadImage extends AsyncTask
     
       {
   @Override protected Void doInBackground(Object… params) {
     

try {          ImageView imageView=(ImageView) params[0];          String path=(String) params[1];          int maxNumOfPixels = (Integer)params[2];        Bitmap bm = CompressPicture.compress(path,maxNumOfPixels);        publishProgress(new Object[] {imageView, bm});      }catch (Exception e) {          e.printStackTrace();      }      return null;}  protected void onProgressUpdate(Object... progress) {      ImageView imageView = (ImageView) progress[0];      Bitmap bm = (Bitmap) progress[1];    if(bm != null){        imageView.setImageBitmap(bm);     }}

}

/** * 图片异步加载 * @author Bryant * */public class AsyncImageLoader {    private Map> imageCache=new HashMap>();    private int maxNumPixels;        public Bitmap loadBitmap(final String imagePath,int maxNumPixels,final ImageCallback callback){        this.maxNumPixels = maxNumPixels;                if(imageCache.containsKey(imagePath)){            SoftReference softReference=imageCache.get(imagePath);            if(softReference.get()!=null){                return softReference.get();            }        }        final Handler handler=new Handler(){            @Override            public void handleMessage(Message msg) {                callback.imageLoaded((Bitmap) msg.obj, imagePath);            }        };        new Thread(){            public void run() {                Bitmap bitmap=loadImageFromPath(imagePath);                imageCache.put(imagePath, new SoftReference(bitmap));                handler.sendMessage(handler.obtainMessage(0,bitmap));            };        }.start();        return null;    }        protected Bitmap loadImageFromPath(String imagePath) {        try {            return CompressPicture.compress(imagePath, maxNumPixels);        } catch (Exception e) {            throw new RuntimeException(e);        }    }    public interface ImageCallback{        public void imageLoaded(Bitmap imageBitmap,String imagePath);    }},>,>

经过实际使用，AsyncImageLoader的效率比较高，但是调用比较麻烦。 调用示例：

private AsyncImageLoader imageLoader = new AsyncImageLoader();imageLoader.loadBitmap(imagePath,maxNumPixels, new ImageCallback() {    public void imageLoaded(Bitmap imageBitmap, String imagePath) {        imageView.setImageBitmap(imageBitmap);    }});

AsyncLoadImage调用较简单，调用示例如下：

new AsyncLoadImage().execute(new Object[]{imageView,imagePath,maxNumPixels});