使用UDP发送和接收

Question

I am trying to implement data transfer between a back-end server and the android device which is a request from device to server for information and the server responds(UDP use because it is faster and the functionality of TCP isn't needed, I guess...)

Where do I begin for implementing this? I have looked at the Android Docs for DatagramSocket/Packet/SocketImplFactory as well as InetAddress and SocketAddress.

Is this the right direction? Right now I am using HTTP Post requests, is any of that code recyclable?

HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost(url);
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
            if (fleetID != null) {
                nameValuePairs.add(new BasicNameValuePair("fleetID", fleetID));

            }
            nameValuePairs.add(new BasicNameValuePair("user", username));
            nameValuePairs.add(new BasicNameValuePair("password", password));

            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
            HttpResponse response = httpclient.execute(httppost);
//TODO: response failure? need to ensure success
            HttpEntity resEntity = response.getEntity();

            String strEntity = EntityUtils.toString(resEntity);
            //Log.i("RESPONSE", strEntity);
            return (strEntity);

Answer 1

The server and Android components can both be written in Java using the the standard Java DatagramSocket class. A quick example can be found here (in this instance it is sending a String from the command prompt: http://systembash.com/content/a-simple-java-udp-server-and-udp-client/ . Basically, you make a DatagramSocket instance with a given port number and you send/recieve the data as a byte[]. However, I would be careful with using UDP. TCP ensures that no data is lost when the file is sent, and therefore ensures that data is not corrupted as it is sent.