Java Android通过url设置ImageButton背景

我试图通过url向ImageButton添加背景图像

我修改了google android文档中的downloadimagetask，如下所示

class DownloadImageButtonTask extends AsyncTask<String, Void, Bitmap> {
        ImageView bmImage;

        public DownloadImageButtonTask(ImageButton bmImage) {
            this.bmImage = bmImage;
        }

        protected Bitmap doInBackground(String... urls) {
            String urldisplay = urls[0];
            Bitmap mIcon11 = null;
            try {
                InputStream in = new java.net.URL(urldisplay).openStream();
                mIcon11 = BitmapFactory.decodeStream(in);
            } catch (Exception e) {
                Log.e("Error", e.getMessage());
                e.printStackTrace();
            }
            return mIcon11;
        }

        protected void onPostExecute(Bitmap result) {
            bmImage.setImageBitmap(result);
        }
    }

设置 尝试设置

if( e.getMessage()!=null)
{
Log.e("Error", e.getMessage());
e.printStackTrace();
}

或者干脆

String exception= (e.getMessage()!=null)?ex.getMessage():"Exception occured";
 Log.e("Error", exception);

---

logcat错误消失，应用程序不会强制关闭，但背景不会显示在imagebutton上。@user1910290请确保您正在接收位图且不为空。最好使用

UniversalImageDownloader

下载图像。

String exception= (e.getMessage()!=null)?ex.getMessage():"Exception occured";
 Log.e("Error", exception);