void showNotification(message) async {
  var androidPlatformChannelSpecifics = new AndroidNotificationDetails(
    Platform.isAndroid ? 'com.dfa.flutterchatdemo' : 'com.duytq.flutterchatdemo',
    'Flutter chat demo',
    'your channel description',
    playSound: true,
    enableVibration: true,
    importance: Importance.Max,
    priority: Priority.High,
  );
  var iOSPlatformChannelSpecifics = new IOSNotificationDetails();
  var platformChannelSpecifics =
  new NotificationDetails(androidPlatformChannelSpecifics, iOSPlatformChannelSpecifics);
  await flutterLocalNotificationsPlugin.show(
      0, message['title'].toString(), message['body'].toString(), platformChannelSpecifics,
      payload: json.encode(message));
}