// class async task untuk mengirim data ke server
    private class SendRegisterData extends AsyncTask<String, Void, String> {

        private ProgressDialog progressDialog;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            progressDialog = new ProgressDialog(RegisterActivity.this);
            progressDialog.setMessage("Mohon tunggu...");
            progressDialog.show();
        }

        @Override
        protected String doInBackground(String... strings) {
            String nama = strings[0];
            String nohp = strings[1];
            String user = strings[2];
            String pass = strings[3];
            // panggil class Networking
            Networking.getJSON("http://192.3.168.178/pkt/adduser.php?" +
                    "token=inix8875" +
                    "&nama=" + nama +
                    "&nohp=" + nohp +
                    "&user=" + user +
                    "&pass=" + pass);
            return null;
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            // matikan unyer2
            if (progressDialog.isShowing()) progressDialog.dismiss();
            // Pesan tersimpan
            Toast.makeText(RegisterActivity.this, "User tersimpan", Toast.LENGTH_SHORT).show();
        }
    }