android - Flutter Scheduled Notifications Not Working with flutter_local_notifications Plugin - Stack Overflow

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I'm encountering an issue with scheduled notifications in my Flutter application using the flutter_local_notifications package. While immediate notifications function correctly, scheduled notifications do not appear as expected. There are no errors or warnings in the debug console.​

• flutter_local_notifications Version: ^19.0.0
• Platform: Android 10

import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:flutter_timezone/flutter_timezone.dart';
import 'package:timezone/timezone.dart' as tz;
import 'package:timezone/data/latest.dart' as tz;

class NotificationService {
  final notificationsPlugin = FlutterLocalNotificationsPlugin();

  bool _isInitialized = false;

  bool get isInitialized => _isInitialized;

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

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

    print("Device Timezone: $currentTimeZone");

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

    const initSettings = InitializationSettings(android: initSettingsAndroid);

    await notificationsPlugin.initialize(initSettings);
    _isInitialized = true;
  }

  // Notification Detail
  NotificationDetails notificationDetails() {
    return NotificationDetails(
      android: AndroidNotificationDetails(
        'daily_channel_id',
        'Daily Notifications',
        channelDescription: 'Daily notifications for the app',
        importance: Importance.max,
        priority: Priority.high,
      ),
    );
  }

  // Show Notifications
  Future<void> showNotifications({
    int id = 0,
    String? title,
    String? body,
  }) async {
    return notificationsPlugin.show(
      id,
      title,
      body,
      notificationDetails(),
    );
  }

  // Schedule a notification at a specified time (hour: 0-23, min: 0-59)
Future<void> scheduleNotification({
  int id = 1,
  required String title,
  required String body,
  required int hour,
  required int minute,
}) async {
  // Get the current date/time in device's local timezone
  final now = tz.TZDateTime.now(tz.local);
  print("Current Time (TZ): $now");

  // Create a date time for today at the specified hour and minute
  var scheduledDate = tz.TZDateTime(
    tz.local,
    now.year,
    now.month,
    now.day,
    hour,
    minute,
  );

  print("Scheduled Time (Before Adjustment): $scheduledDate");

  // Ensure scheduled time is in the future
  if (scheduledDate.isBefore(now)) {
    scheduledDate = scheduledDate.add(Duration(days: 1));
    print("Scheduled Time Adjusted to Next Day: $scheduledDate");
  }

  // Schedule the notification
  await notificationsPlugin.zonedSchedule(
    id,
    title,
    body,
    scheduledDate,
    notificationDetails(),
    androidScheduleMode: AndroidScheduleMode.inexactAllowWhileIdle,
    matchDateTimeComponents: DateTimeComponents.dateAndTime,
   
  );

  print("Final Scheduled Time: $scheduledDate");
}

  // Cancel all notifications
  Future<void> cancelAllNotifications() async {
    await notificationsPlugin.cancelAll();
  }
}

• Trigger immediate notifications using the showNotifications method, which works as intended.​
• Despite calling the scheduleNotification method and observing the printed scheduled times in the console, the notifications do not appear at the specified times.
• Confirmed that the device's time zone is correctly identified and set using the flutter_timezone and timezone packages.​
• Inserted print statements to verify the current time and the calculated scheduled time. The logs indicate that the scheduled times are computed correctly.​
• Verified that the application has the necessary permissions to display notifications. Since the target device is running Android 10, no additional permissions are required for scheduling exact alarms.​
• Checked and ensured that battery optimization settings are not restricting the application's background processes.​

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