在Android问题上使用带有JSON对象的POST请求

Question

我正在尝试使用JSON对象在android上制作post方法，我能够创建post方法所需的JSON文件，一切似乎都很好，我只是没有得到结果，我结果空虚。

这是我的代码：

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    text = (TextView) findViewById(R.id.textView1);
RadioGroup  rg = (RadioGroup) findViewById(R.id.radioGroup1);
JSONObject jsonObj = new JSONObject();
try {
    jsonObj.put("IdSurvey", "102");
    jsonObj.put("IdUser", "toto");
    jsonObj.put("UserInformation", "toto de Paris");
    JSONArray jsonArr = new JSONArray();

        JSONObject j= new JSONObject();
        j.put("IdQuestion", "5766");
        j.put("IdProposition", "9716");
        j.put("Time", "32");
       jsonArr.put(j);

       jsonObj.put("List", jsonArr);


 String result =    POST("http://tv3.orangeadd.com/answers/102?owner=ofc&user=toto",jsonObj);
 text.setText(result);
 Toast.makeText(MainActivity.this, "result "+result, Toast.LENGTH_SHORT).show();


} catch (JSONException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

}

public static String POST(String url, JSONObject jso){
    InputStream inputStream = null;
    String result = "empty";
    try {


        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);

        String json = "";

        json = jso.toString();



        StringEntity se = new StringEntity(json);

       httpPost.setEntity(se);

        httpPost.setHeader("Accept", "application/json");
        httpPost.setHeader("Content-type", "application/json");


        HttpResponse httpResponse = httpclient.execute(httpPost);


        inputStream = httpResponse.getEntity().getContent();

        if(inputStream != null)
            result = convertInputStreamToString(inputStream);
        else
            result = "Did not work!";

    } catch (Exception e) {

    }

    // 11. return result
    return result;
}
private static String convertInputStreamToString(InputStream inputStream) throws IOException{
    BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(inputStream));
    String line ="";
    String result ="";
    while((line = bufferedReader.readLine()) != null)
    result += line;
    inputStream.close();
    return result;
}   

好吧，我没有收到任何错误，只是空洞的结果！谢谢你的家伙