Basically here im using url connection to connect to php, everything is work find in log in and register phase, now i want to fetch the json object that i create in php file and then display it in a string view, so anyone got idea regarding this?

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_display);

    dataField = (TextView) findViewById(R.id.data);
    btnDis = (Button) findViewById(R.id.btnClick);




    btnDis.setOnClickListener (new View.OnClickListener(){
        @Override
        public void onClick(View v){

            strUrl ="http://10.0.2.2/android/display.php";

            new jsonParse().execute();
        }
    });
}




public class jsonParse extends AsyncTask{
    @Override
    protected void onPreExecute() {

        super.onPreExecute();

    }

    @Override
    protected void onPostExecute(String s) {

        Toast.makeText(EditActivity.this,""+result,Toast.LENGTH_LONG ).show();
    }

    @Override
    protected String doInBackground(String... params) {
        try{
            URL url = new URL (strUrl);
            HttpURLConnection con = (HttpURLConnection) url.openConnection();
            con.setRequestMethod("POST");
            con.connect();

            //get response from server
            BufferedReader bf = new BufferedReader(new InputStreamReader(con.getInputStream()));
            String value = bf.readLine();
            System.out.println("result is"+value);
            result = value;

            String finalJson = bf.toString();
            JSONObject parentObject = new JSONObject(finalJson);
            JSONArray parentArray = parentObject.getJSONArray("data");

            JSONObject finalObject= parentArray.getJSONObject(0);
            String username = finalObject.getString("NAME");
            String age = finalObject.getString("AGE");
            String result = username +" - "+age;
            return result;
        }


        catch(Exception e){
            System.out.println(e);
        }

        return null;
    }
}

}

Here is my php file called display.php

 0){
  $status = 'true';
  $message = 'data retrieved successfully';
      while($row = mysqli_fetch_assoc($result)){
        $name = $row['name'];
        $age = $row['age'];
        $username = $row['username'];


        // echo $name."\n\n";
        // echo $age."\n\n";
        // echo $username."\n\n";

        $data .= '{"NAME" : "'.$name.'", "AGE" : "'.$age.'", "USERNAME" : "'.$username.'"},';
      }

}else{
  $status = 'false';
  $message = 'data retrieved failed';
  $data = '';
}

mysqli_free_result($result);
mysqli_close($conn);
}else{
  $message = mysqli_error($conn);
}
$output = '{"status": "'.$status.'","message":"'.$message.'", "data": ['.rtrim($data, ',').']}';
echo $output;

?>