ios – Flutter scheduled (time-based) notifications don’t fire on Android — immediate notifications work

I’m building my first Flutter app for Android and iOS and I’m stuck with scheduled notifications on Android.

• What works: immediate notifications (show(…)) display fine after the user enables notifications.
• What doesn’t: time-based (scheduled/weekly) notifications never fire at the selected weekday & time.
• Permissions: On Android, the app asks for notification permission and I’ve also enabled Alarms & reminders (Schedule exact alarms) in system settings. Both are ON.

Environment

• flutter_local_notifications: ^19.4.0
• timezone: ^0.10.1
• flutter_timezone: ^4.1.1
• Device(s): [Android Studio + Medium Device API 36, Samsung Galaxy S23 + Android 15

What I expect
When the user picks a weekday and time (e.g., Monday at 09:00), a notification should appear then, and repeat weekly.

What actually happens
Nothing fires at the scheduled time. No crashes. Immediate notifications using the same channel work reliably.

Code:
Settings_Screen

import 'package:my_app/config/notifications.dart';

 // --- Notifications ---
          const Divider(height: 32),
          SwitchListTile(
            title: const Text('Benachrichtigungen aktivieren'),
            value: _notifEnabled,
            onChanged: _toggleNotifications,
          ),

          if (_notifEnabled) ...[
            _buildExactStatusTile(), // neu

            const SizedBox(height: 8),
            const Text('Wochentag', style: TextStyle(fontWeight: FontWeight.bold)),
            Wrap(
              spacing: 8,
              children: List.generate(7, (i) {
                final int day = i + 1; // 1=Mo ... 7=So
                const labels = ['Mo','Di','Mi','Do','Fr','Sa','So'];
                return ChoiceChip(
                  label: Text(labels[i]),
                  selected: _notifWeekday == day,
                  onSelected: (_) async {
                    setState(() => _notifWeekday = day);
                    await _persistNotificationPrefs();
                    await _applyNotificationSchedule();
                  },
                );
              }),
            ),

            const SizedBox(height: 16),
            ListTile(
              leading: const Icon(Icons.access_time),
              title: Text(
                _notifTime == null
                    ? 'Uhrzeit auswählen'
                    : 'Uhrzeit: ${_notifTime!.format(context)}',
              ),
              onTap: _pickNotificationTime,
            ),

            if (_notifWeekday == null || _notifTime == null)
              const Padding(
                padding: EdgeInsets.only(top: 8),
                child: Text(
                  'Hinweis: Bitte Wochentag und Uhrzeit wählen, damit die Erinnerung geplant wird.',
                  style: TextStyle(color: Colors.grey),
                ),
              ),
          ],
        ],
      ),

notifications

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

static tz.TZDateTime _nextWeekdayTime({
    required int weekday, 
    required int hour,
    required int minute,
    Duration grace = const Duration(seconds: 30),
  }) {
    final now = tz.TZDateTime.now(tz.local);
    final todayAt = tz.TZDateTime(tz.local, now.year, now.month, now.day, hour, minute);
    final daysUntil = (weekday - now.weekday) % 7;
    var scheduled = todayAt.add(Duration(days: daysUntil));
    if (scheduled.isBefore(now.add(grace))) {
      scheduled = scheduled.add(const Duration(days: 7));
    }
    return scheduled;
  }

  static Future scheduleWeekly({
    required int id,
    required String title,
    required String body,
    required int weekday,
    required int hour,
    required int minute,
    String? payload,
  }) async {
    final when = _nextWeekdayTime(weekday: weekday, hour: hour, minute: minute);
    final mode = await _pickAndroidScheduleMode();

main

import 'package:timezone/data/latest_all.dart' as tz;
import 'package:timezone/timezone.dart' as tz;
import 'package:flutter_timezone/flutter_timezone.dart';
import 'package:my_app/config/notifications.dart' show NotificationsService;

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  tz.initializeTimeZones();
  final name = await FlutterTimezone.getLocalTimezone(); // "Europe/Berlin" etc.
  tz.setLocalLocation(tz.getLocation(name));
  await NotificationsService.init();

AndroidManifest

What I’ve tried

• Confirmed Notifications permission is granted (Android 13+).

• Enabled Alarms & reminders (Schedule exact alarms) in system settings (Android 12+).

• Tested with androidAllowWhileIdle: true.

• Verified the channel is not blocked and importance is max.

• Disabled battery optimizations for the app.

• Tested on emulator and physical device.

• Double-checked that the computed scheduled time is in the future and has the correct weekday.

• Confirmed Notifications permission is granted (Android 13+).

• Enabled Alarms & reminders (Schedule exact alarms) in system settings (Android 12+).

• Tested with androidAllowWhileIdle: true.

• Verified the channel is not blocked and importance is max.

• Disabled battery optimizations for the app.

• Tested on emulator and physical device.

• Double-checked that the computed scheduled time is in the future and has the correct weekday.