How to post json with volley to php web service

Question

I am trying to Post Json to my restful API with volley but it doesn't work. So far i have tested my web service by sending a json payload through the Advance rest client app on chrome and it returns a json response.... but when i try it with Volley it returns onErrorResponse. Please can someone tell me how to solve this problem, thanks in advance.

Json payLoad:

   {"country":"isreal","mobile":"009988778"}

Code

 private void processLogin() {
    showProgressDialog();
    JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.POST,
            Const.LOGIN_URL, null, new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {
            Log.i("JSON response", "JSON Posting" + response.toString());
            hideProgessDialog();
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError volleyError) {
            VolleyLog.d(ERROR_TAG, "Error: " + volleyError.getMessage());
            hideProgessDialog();
        }
    }){

    @Override
        public Map<String, String> getHeaders() throws AuthFailureError {
            HashMap<String, String> headers = new HashMap<String, String>();
            headers.put("Content-Type", "application/json");
            return headers;
    }

    @Override
    protected Map<String, String> getParams(){
        String country_value = country.getSelectedItem().toString();
        String mobile_value = mobile.getText().toString();
        Map<String, String> params = new HashMap<>();
        params.put("country",country_value);
        params.put("mobile", mobile_value);
        return params;
    }
    };

    AppController.getInstance().addToRequestQueue(jsonObjReq, login_tag);

}

Answer 1

1. Convert object to json string.
2. Override getBody of Volley request object

3. Override getBodyContentType to set as json

     Gson gson = new Gson();
     final String json = gson.toJson(loginDTO);
   
   
     GsonRequest<EmailLoginRestResponse> jsObjRequest = new GsonRequest<EmailLoginRestResponse>(
               Request.Method.POST, url,
               EmailLoginRestResponse.class, null,
               this.createLoginRequestSuccessListener(),
               this.createLoginErrorListener()){
   
           @Override
           public byte[] getBody() throws AuthFailureError {
               return json.getBytes();
           }
   
           @Override
           public String getBodyContentType() {
               return "application/json; charset=" + this.getParamsEncoding();
           }
       };
   
       jsObjRequest.setShouldCache(false);
       this.mRequestQueue.add(jsObjRequest);
   

GsonRequest.java

https://github.com/ogrebgr/android_volley_examples/blob/master/src/com/github/volley_examples/toolbox/GsonRequest.java

Answer 2

What you are doing is, you are trying to send a JSON as a part of Headers which won't work.

This is what you need -

JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.POST,
            Const.LOGIN_URL, **->YOUJSONOBJECTHERE<-**, new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {
            Log.i("JSON response", "JSON Posting" + response.toString());
            hideProgessDialog();
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError volleyError) {
            VolleyLog.d(ERROR_TAG, "Error: " + volleyError.getMessage());
            hideProgessDialog();
        }
    });

You need to send JSONObject as a part of request not as a part of request headers. Try it out and let me, if it fixes the issue else we troubleshoot it.

And as you already using JSONObjectRequest, you niether need to set the content type nor override getParams() until or unless you need to send some extra information in your header like AgentType, tokens etc.