code: public boolean downloadToStream(ImageTask imageTask, String urlString, OutputStream outputStream, ProgressUpdateHandler progressUpdateHandler) {
          disableConnectionReuseIfNecessary();
          HttpURLConnection urlConnection = null;
          BufferedOutputStream out = null;
          BufferedInputStream in = null;
  
          try {
              final URL url = new URL(urlString);
              urlConnection = (HttpURLConnection) url.openConnection();
              urlConnection.setReadTimeout(0);
              int len = urlConnection.getContentLength();
              int total = 0;
              in = new BufferedInputStream(urlConnection.getInputStream(), IO_BUFFER_SIZE);
              out = new BufferedOutputStream(outputStream, IO_BUFFER_SIZE);
              int b;
              while ((b = in.read()) != -1) {
                  total++;
                  out.write(b);
                  if (progressUpdateHandler != null) {
                      progressUpdateHandler.onProgressUpdate(total, len);
                  }
              }
              return true;
          } catch (final IOException e) {
              CLog.e(LOG_TAG, "Error in downloadBitmap - " + e);
          } finally {
              if (urlConnection != null) {
                  urlConnection.disconnect();
              }
              try {
                  if (out != null) {
                      out.close();
                  }
                  if (in != null) {
                      in.close();
                  }
              } catch (final IOException e) {
              }
          }
          return false;
      }
docs: Download a bitmap from a URL and write the content to an output stream.