Android imageloade异步加载图片的，怎么知道图片是否加载完成？

imageloader有回调函数的。

 ImageLoader.getInstance().displayImage(uri, imageView, new ImageLoadingListener() {

            @Override
            public void onLoadingStarted(String arg0, View arg1) {
                // TODO Auto-generated method stub

            }

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

            }

            @Override
            public void onLoadingComplete(String arg0, View arg1, Bitmap arg2) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onLoadingCancelled(String arg0, View arg1) {
                // TODO Auto-generated method stub

            }
        })