FirstName: '',
        MiddleName: '',
        LastName: '',
        EmailAddress: '',
        ReceiveUpdates: false,
        Login: {
            UserName: '',
            Password: '',
        }

AsyncHttpClient client = new AsyncHttpClient();
               RequestParams params = new RequestParams();
                params.put("FirstName", "ALi");
                params.put("MiddleName", "Farhan");
                params.put("LastName", "Ali");
                params.put("EmailAddress", "far67890@gmail.com");
                params.put("ReceiveUpdates", "false");
                params.put("UserName", "farhan6");
                params.put("Password", "cricket");

                        client.post("http://urb-app.com/Buyer/Register", params, new AsyncHttpResponseHandler() {

                            @Override
                            public void onSuccess(String s) {
                                super.onSuccess(s);
                                Toast.makeText(getApplicationContext(), "Success :" + s, Toast.LENGTH_LONG).show();
                                //  tv.append("service_ReloadSqlDB" + "    " + s);
                            }

                            @Override
                            public void onFailure(Throwable throwable) {
                                super.onFailure(throwable);
                                Toast.makeText(getApplicationContext(), "Server Response for onFailure ", Toast.LENGTH_LONG).show();
                            }
                        });

Login: {
            UserName: '',
            Password: '',
        },