ImageLoader

//初始化数据
ImageLoader.getInstance().init(
        ImageLoaderConfiguration.createDefault(MainActivity.this));
//圆形图片加载
DisplayImageOptions  options = new DisplayImageOptions.Builder().displayer(new RoundedBitmapDisplayer(50))
        .build();
//缓存到本地
DisplayImageOptions options = new DisplayImageOptions.Builder()
        .showImageOnLoading(R.drawable.ic_launcher).cacheInMemory(true)
        .cacheOnDisk(true).build();
//加载图片资源w2
ImageLoader.getInstance().displayImage(url, iv, options);
//监听事件
ImageLoader.getInstance().loadImage(url, new ImageLoadingListener() {
    //开始加载
    @Override
    public void onLoadingStarted(String arg0, View arg1) {
        // TODO Auto-generated method stub

    }
    //加载失败
    @Override
    public void onLoadingFailed(String arg0, View arg1, FailReason arg2) {
        // TODO Auto-generated method stub

    }
    //加载完成
    @Override
    public void onLoadingComplete(String arg0, View arg1, Bitmap arg2) {
        // TODO Auto-generated method stub
        iv.setImageBitmap(arg2);
    }
    //加载取消
    @Override
    public void onLoadingCancelled(String arg0, View arg1) {
        // TODO Auto-generated method stub

    }
});