I am building an app and want to send reminders about the tasks the user has to complete. For that I am using flutter_local_notifications: 18.0.1. The variables that I use in this class are below:

static final NotificationService _instance = NotificationService._internal();
  factory NotificationService() => _instance;

  NotificationService._internal(); // Private constructor

  final FlutterLocalNotificationsPlugin notificationsPlugin =
      FlutterLocalNotificationsPlugin();

  bool _isInitialized = false;

  bool get isInitialized => _isInitialized;

Below is the initNotification method for the NotificationService class I made using ChatGPT, which is called in the main() function:

Future<void> initNotification() async {
    if (_isInitialized) return;

    // Init timezone
    tz.initializeTimeZones();
    final String currentTimeZone = await FlutterTimezone.getLocalTimezone();
    tz.setLocalLocation(tz.getLocation(currentTimeZone));

    // Android init
    const AndroidInitializationSettings initSettingsAndroid =
        AndroidInitializationSettings('@mipmap/ic_launcher');

    // iOS init
    const DarwinInitializationSettings initSettingsIOS =
        DarwinInitializationSettings(
      requestAlertPermission: true,
      requestSoundPermission: true,
      requestBadgePermission: true,
    );

    // Init settings
    const InitializationSettings initSettings = InitializationSettings(
      android: initSettingsAndroid,
      iOS: initSettingsIOS,
    );

    // Init notifications plugin
    await notificationsPlugin.initialize(initSettings);

    _isInitialized = true;
  }

The NotificationDetails:

    // Notification details setup
  NotificationDetails notificationDetails() {
    return const NotificationDetails(
      android: AndroidNotificationDetails(
        'daily_reminder',
        'Daily Reminders',
        channelDescription: 'Reminder to complete a goal',
        importance: Importance.max,
        priority: Priority.high,
      ),
      iOS: DarwinNotificationDetails(),
    );
  }

When I use notificationsPlugin.show(), that notification works like a charm. But if I try to schedule a notification, that does not work for some reason:

    Future<void> scheduleNotification({
    int id = 1,
    required String title,
    required String body,
    required int hour,
    required int min,
  }) async {
    final now = tz.TZDateTime.now(tz.local);

    var scheduledDate = tz.TZDateTime(
      tz.local,
      now.year,
      now.month,
      now.day,
      hour,
      min,
    );
    await Permission.scheduleExactAlarm.isDenied.then((value) {
      if (value) {
        Permission.scheduleExactAlarm.request();
      }
    });
    await notificationsPlugin.zonedSchedule(
      id,
      title,
      body,
      scheduledDate,
      notificationDetails(),
      uiLocalNotificationDateInterpretation:
          UILocalNotificationDateInterpretation.absoluteTime,
      androidScheduleMode: AndroidScheduleMode.exactAllowWhileIdle,
      matchDateTimeComponents: DateTimeComponents.time,
    );
  }

I do give the app all the permissions that it needs, namely the Permission.notification to send notifications in general, and Permission.scheduleExactAlarm to schedule the alarms. What am I doing wrong?

I am building an app and want to send reminders about the tasks the user has to complete. For that I am using flutter_local_notifications: 18.0.1. The variables that I use in this class are below:

static final NotificationService _instance = NotificationService._internal();
  factory NotificationService() => _instance;

  NotificationService._internal(); // Private constructor

  final FlutterLocalNotificationsPlugin notificationsPlugin =
      FlutterLocalNotificationsPlugin();

  bool _isInitialized = false;

  bool get isInitialized => _isInitialized;

Below is the initNotification method for the NotificationService class I made using ChatGPT, which is called in the main() function:

Future<void> initNotification() async {
    if (_isInitialized) return;

    // Init timezone
    tz.initializeTimeZones();
    final String currentTimeZone = await FlutterTimezone.getLocalTimezone();
    tz.setLocalLocation(tz.getLocation(currentTimeZone));

    // Android init
    const AndroidInitializationSettings initSettingsAndroid =
        AndroidInitializationSettings('@mipmap/ic_launcher');

    // iOS init
    const DarwinInitializationSettings initSettingsIOS =
        DarwinInitializationSettings(
      requestAlertPermission: true,
      requestSoundPermission: true,
      requestBadgePermission: true,
    );

    // Init settings
    const InitializationSettings initSettings = InitializationSettings(
      android: initSettingsAndroid,
      iOS: initSettingsIOS,
    );

    // Init notifications plugin
    await notificationsPlugin.initialize(initSettings);

    _isInitialized = true;
  }

The NotificationDetails:

    // Notification details setup
  NotificationDetails notificationDetails() {
    return const NotificationDetails(
      android: AndroidNotificationDetails(
        'daily_reminder',
        'Daily Reminders',
        channelDescription: 'Reminder to complete a goal',
        importance: Importance.max,
        priority: Priority.high,
      ),
      iOS: DarwinNotificationDetails(),
    );
  }

When I use notificationsPlugin.show(), that notification works like a charm. But if I try to schedule a notification, that does not work for some reason:

    Future<void> scheduleNotification({
    int id = 1,
    required String title,
    required String body,
    required int hour,
    required int min,
  }) async {
    final now = tz.TZDateTime.now(tz.local);

    var scheduledDate = tz.TZDateTime(
      tz.local,
      now.year,
      now.month,
      now.day,
      hour,
      min,
    );
    await Permission.scheduleExactAlarm.isDenied.then((value) {
      if (value) {
        Permission.scheduleExactAlarm.request();
      }
    });
    await notificationsPlugin.zonedSchedule(
      id,
      title,
      body,
      scheduledDate,
      notificationDetails(),
      uiLocalNotificationDateInterpretation:
          UILocalNotificationDateInterpretation.absoluteTime,
      androidScheduleMode: AndroidScheduleMode.exactAllowWhileIdle,
      matchDateTimeComponents: DateTimeComponents.time,
    );
  }

I do give the app all the permissions that it needs, namely the Permission.notification to send notifications in general, and Permission.scheduleExactAlarm to schedule the alarms. What am I doing wrong?

• flutter
• flutter-local-notification

2 Answers 2

Are you testing on an Android or iOS device?

On Android, depending on the system, you need to make sure that the battery settings do not close the application in the background. If this is the case, you need to change this setting to allow the application to run in the background.

I don't know the flutter_local_notifications plugin but the doc says you have to ask for permission like this:

FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin(); flutterLocalNotificationsPlugin.resolvePlatformSpecificImplementation< AndroidFlutterLocalNotificationsPlugin>().requestNotificationsPermission();

The doc : https://pub.dev/packages/flutter_local_notifications#requesting-permissions-on-android-13-or-higher