Android使用异步任务下载图片

public class DownLoadImage extends AsyncTask<String, Void, Bitmap> {
ImageView imageView;

public DownLoadImage(ImageView imageView) {
// TODO Auto-generated constructor stub
this.imageView = imageView;
}

@Override
protected Bitmap doInBackground(String... urls) {
// TODO Auto-generated method stub
String url = urls[0];
Bitmap tmpBitmap = null;
try {
InputStream is = new java.net.URL(url).openStream();
tmpBitmap = BitmapFactory.decodeStream(is);
} catch (Exception e) {
e.printStackTrace();
}
return tmpBitmap;
}

@Override
protected void onPostExecute(Bitmap result) {
// TODO Auto-generated method stub
imageView.setImageBitmap(result);
}
}

调用方法：