AsyncTask to Show Image with loading

Following code will show a progress bar(ajax-loading) instead of the image I want to show.

docImage.setVisibility(View.GONE);
pBar.setVisibility(View.VISIBLE);
new DownloadFilesTask().execute(new URL("http://..."));

Once the download is complete the target image will be shown and the progress bar will be gone. To make this code work we need to put both target-image and progress-bar in the same layout position.

private class DownloadFilesTask extends AsyncTask {
     
     Drawable d;
     
     public Object fetch(URL url) throws MalformedURLException,IOException {
         Object content = url.getContent();
         return content;
     }
     
     protected Long doInBackground(URL... urls) {
         long totalSize = 0;
         URL url = urls[0];
         try {
           InputStream is = (InputStream) this.fetch(url);
           d = Drawable.createFromStream(is, "src");
         } catch (Exception e) {
           e.printStackTrace();
           return 0L;
         }
         return totalSize;
     }

     protected void onProgressUpdate(Integer... progress) {
         //setProgressPercent(progress[0]);
     }

     protected void onPostExecute(Long result) {
         docImage.setImageDrawable(d);
         pBar.setVisibility(View.GONE);
         docImage.setVisibility(View.VISIBLE);
     }
}