如何从Android的数据发送到谷歌在Java做应用程序引擎的Web应用程序

private String s;
EditText numDisplay;
Button calculateNow;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    numDisplay= (EditText)findViewById(R.id.editText1);
    calculateNow = (Button)findViewById(R.id.button1);
    //s=numDisplay.toString();  
    calculateNow.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            {

                new MyAsyncTask().execute(numDisplay.getText().toString());     

            } }
     } );
}
private class MyAsyncTask extends AsyncTask<String, Integer, Double>{
        protected Double doInBackground(String... params) {

            postData(params[0]);
            return null;
        }
        protected void onPostExecute(Double result){
            //pb.setVisibility(View.GONE);
            Toast.makeText(getApplicationContext(), "command sent", Toast.LENGTH_LONG).show();
        }

        protected void onProgressUpdate(Integer... progress){
            //pb.setProgress(progress[0]);
        }
        public void postData(String valueIWantToSend) {
            // Create a new HttpClient and Post Header
            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost("http://1-dot-primecalculation.appspot.com/");

            try {

                // Add your data
                List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
                nameValuePairs.add(new BasicNameValuePair("id0", valueIWantToSend));
                httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

                // Execute HTTP Post Request
                HttpResponse response = httpclient.execute(httppost);

            } catch (ClientProtocolException e) {
                // TODO Auto-generated catch block
            } catch (IOException e) {
                // TODO Auto-generated catch block
            }
        }



   }
 }

**Server Side Code**
private static final long serialVersionUID = 1L;
@Override
public void doPost(HttpServletRequest req, HttpServletResponse resp)
        throws IOException {
    processRequest(req, resp);

    String user = req.getParameter("id0");
    //resp.setContentType("text/plain");
    PrintWriter writer = resp.getWriter();
     writer.write("value" + user);
}
private void processRequest(HttpServletRequest req, HttpServletResponse resp)throws IOException {
// TODO Auto-generated method stub
}
@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {

    doPost(req, resp);
}}

我是新来的Google App Engine和android.Made在Android的应用程序从用户的取值，并张贴到的servlet。
我用的HttpClient发布在Android与Servlet数据，本地托管的以及从仿真器发送数据。
我收到空值从servlet的side.I GOOGLE了很多在这个背景下，但没有得到解决的issue.Any帮助AP preciated.Thnx

I am new to google app engine and android.Made an application in android which takes value from user and post it to servlet. I used httpClient to post data from android to servlet,hosted locally and sending data from emulator . I receive null value from servlet side.I googled a lot in this context but not getting solution for the issue.Any help appreciated.Thnx