firebaseMessagingForegroundHandler method Null safety

Implementation

Future<void> firebaseMessagingForegroundHandler(RemoteMessage message) {
  LogManager().addLog("firebaseMessagingForegroundHandler: ${message.data}", screen: runtimeType.toString());
  math.Random rng = math.Random();
  // (안드로이드만 해당) 여러 알림이 왔을때 알림을 구별하기위해 랜덤 숫자를 생성함
  int tag = rng.nextInt(9999999);
  Map<String, dynamic> pinpointMessage = message.data;
  pinpointMessage["pinpoint.notification.title"] = message.notification!.title!;
  pinpointMessage["pinpoint.notification.body"] = message.notification!.body!;
  if (pinpointMessage["pinpoint.notification.imageUrl"] != null && pinpointMessage["pinpoint.notification.imageIconUrl"] != null) {
    log("h2");
    return showBigPictureNotification(pinpointMessage);
  } else if (pinpointMessage["pinpoint.notification.imageUrl"] != null) {
    return showBigPictureNotificationHiddenLargeIcon(pinpointMessage);
  } else {
    return flutterLocalNotificationsPlugin.show(
      tag,
      pinpointMessage["pinpoint.notification.title"],
      pinpointMessage["pinpoint.notification.body"],
      NotificationDetails(
        android: AndroidNotificationDetails(
          'high_importance_channel', // id
          'High Importance Notifications', // title
          channelDescription: 'This channel is used for important notifications.',
          // description
          importance: Importance.high,
          icon: null,
          tag: tag.toString(),
        ),
      ),
    );
  }
}