public void LoginUser(){

    // Tag used to cancel the request
    String tag_json_obj = "json_obj_req";

    String url = "http://example.com/myfile/mobile_api/";

    //final ProgressDialog pDialog = ProgressDialog.show(getParent(), "Please wait", "Login user");


            JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.GET,
                    url, null,
                    new Response.Listener<JSONObject>() {

                        @Override
                        public void onResponse(JSONObject response) {
                            try {
                                if(response.getString(KEY_SUCCESS)!=null){

                                    String res = response.getString(KEY_SUCCESS);

                                    if(Integer.parseInt(res) == 1){
                                       JSONObject json_user = response.getJSONObject("user");
                                       Toast.makeText(getApplicationContext(), "User Logged in.. " + json_user.getString("name"), Toast.LENGTH_LONG).show();
                                    }
                                }
                                else if(response.getString(KEY_ERROR)!=null){

                                    String res = response.getString(KEY_ERROR);

                                    if(Integer.parseInt(res) == 1){
                                        Toast.makeText(getApplicationContext(), response.getString("error_msg"), Toast.LENGTH_LONG).show();
                                    }
                                }

                            } catch (JSONException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                                //pDialog.hide();
                            }
                            Log.d(TAG, response.toString());
                            //pDialog.hide();
                        }
                    }, new Response.ErrorListener() {

                        @Override
                        public void onErrorResponse(VolleyError error) {
                            VolleyLog.d(TAG, "Error: " + error.getMessage());
                            Log.d(TAG, "Error: " + error.getMessage());
                            //pDialog.hide();
                        }
                    }) {

                @Override
                protected Map<String, String> getParams() {
                    Map<String, String> params = new HashMap<String, String>();
                    params.put("tag", login_tag);
                    params.put("email", Email);
                    params.put("password", Pass);

                    return params;
                }

            };

    // Adding request to request queue
    AppController.getInstance().addToRequestQueue(jsonObjReq, tag_json_obj);
}

if ($tag == 'login') {

    $email = $_POST['email'];
    $password = $_POST['password'];


    $user = $db->getUserByEmailAndPassword($email, $password);
    if ($user != false) {

        $response["success"] = 1;
        $response["uid"] = $user["id"];
        $response["user"]["name"] = $user["name"];
        $response["user"]["phone"] = $user["contact_no"];
        $response["user"]["email"] = $user["email"];
        $response["user"]["reg_date"] = $user["reg_date"];
        echo json_encode($response);
    } else {

        $response["error"] = 1;
        $response["error_msg"] = "Incorrect email or password!";
        echo json_encode($response);
    }