问如何使用Android通用图像加载器捕获图像并将其用于布局背景？

EN

      ImageLoader.getInstance().loadImage(pack.getCoverImageUrl(), new SimpleImageLoadingListener(){
        @Override
        public void onLoadingStarted(String imageUri, View view) {
            super.onLoadingStarted(imageUri, view);
        }

        @Override
        public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
            super.onLoadingFailed(imageUri, view, failReason);
        }

        @Override
        public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
            super.onLoadingComplete(imageUri, view, loadedImage);
            rl_header_main.setBackgroundDrawable(new BitmapDrawable(loadedImage));
            rl_header_main.setAlpha();
        }

        @Override
        public void onLoadingCancelled(String imageUri, View view) {
            super.onLoadingCancelled(imageUri, view);
        }
    });