I am using volley library to post json object to server.I am accepting data from user using edittext fields.The request is of the form

{     "count": 1,     "next": null,     "previous": null,     "results": [         {             "user": {                 "first_name": "Satyam",                 "last_name": "Gondhale",                 "username": "satyam@gmail.com",                 "email": "satyam@gmail.com",                 "groups": [],                 "is_active": true             },             "phone": "9028571487",             "address": "Pune"         }     ] }   

I am accepting first_name,last_name,email,phone,address from user.My request is of the form

 private void sendData() {               String req = "request";         String url = "http://192.168.1.106:9500/api/userprofile/";           JSONObject jsonObject = new JSONObject();         try {               JSONObject jsonObjectUser=new JSONObject();             jsonObjectUser.put("first_name",first_name);             jsonObjectUser.put("last_name",last_name);             jsonObjectUser.put("username",user_email);             jsonObjectUser.put("email",user_email);             JSONObject jsonObject1=new JSONObject();             jsonObject1.put("address","");             jsonObject1.put("phone",user_phone);             JSONArray jsonArray=new JSONArray();             jsonArray.put(jsonObject1);             jsonArray.put(jsonObjectUser);             jsonObject.put("results",jsonArray);             Log.i("result",jsonArray.toString());           } catch (JSONException e) {             e.printStackTrace();         }         JsonObjectRequest request=new JsonObjectRequest(Request.Method.POST, url,jsonObject, new Response.Listener<JSONObject>() {           @Override           public void onResponse(JSONObject response) {            }       }, new Response.ErrorListener() {           @Override           public void onErrorResponse(VolleyError error) {            }       })         {             @Override             public Map<String, String> getHeaders() throws AuthFailureError {                 Map<String, String> headers = new HashMap<>();                 String credentials = name+":"+pass;                 String auth = "Basic " + Base64.encodeToString(credentials.getBytes(), Base64.NO_WRAP);                 headers.put("Content-type", "application/json");                 headers.put("Authorization", auth);                 return headers;             }         };         AppController.getInstance().addToRequestQueue(request,req);      } }   

But when I send the request data is not post to server and I get error code 400 Bad Request.How to resolve this ?