UDP图像流Android

我所做的如下。

public class getImage extends AsyncTask<String, Bitmap, Bitmap> {
protected void onProgressUpdate(Bitmap... values) {
    Log.i("onProgressUpdate", "done");
    imageDisplay.setImageBitmap(values[0]); //imageDisplay is an ImageView on UI
    imageDisplay.invalidate();
}//end of onProgressUpdate


protected Bitmap doInBackground(String... params) {
//receive an image over socket
publishProgress(bitmapimage); //update on UI
return bitmapimage;

}//end of getImage


public void ConnectionButton(View v) {
Connect = (Button) findViewById(R.id.Connect);
//while(true) {
     try {
          clientsocket = new DatagramSocket(9999);

        } catch (IOException e) {
          Log.i("Connection", "exception while creating socket");
        }

     try {
          getImage obj = new getImage();
          receivedImage = obj.execute("9999").get(); //receive image and over stream
          //obj.onProgressUpdate(receivedImage);

       }
   catch(Exception e){
   e.printStackTrace();
}
    //}//endof while
}//end of ConnectionButton

如果我反复按连接按钮,就会得到流式图像。我已经尝试了onProgress更新,但它很少更新图像,延迟相当大。如何使这些接收到的图像作为实时流显示在应用程序上。