I use flutter_local_notifications for scheduled Android notifications:

    tz.initializeTimeZones();

final String currentTimeZone = await FlutterTimezone.getLocalTimezone();
tz.setLocalLocation(tz.getLocation(currentTimeZone));

var androidPlatformChannelSpecifics = AndroidNotificationDetails(
      'your_channel_id', 'your_channel_name',
      importance: Importance.max, priority: Priority.high, ticker: 'ticker');
var platformChannelSpecifics = NotificationDetails(
         android: androidPlatformChannelSpecifics);
 

var date = tz.TZDateTime.now(tz.local).add(const Duration(seconds: 5));

await flutterLocalNotificationsPlugin.zonedSchedule(
    0,
    'scheduled title',
    'scheduled body',
    date,
    platformChannelSpecifics,
    androidScheduleMode: AndroidScheduleMode.exactAllowWhileIdle);

}

This works when the app is in the background, but it doesn't work if the device is locked. I need a sound signal when the device is locked.

Here is permissions in AndroidManifest.xml:

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
<uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM" />
<uses-permission android:name="android.permission.WAKE_LOCK" />

Do I need to use Full-screen intent notifications to get notifications when device is locked?

I use flutter_local_notifications for scheduled Android notifications:

    tz.initializeTimeZones();

final String currentTimeZone = await FlutterTimezone.getLocalTimezone();
tz.setLocalLocation(tz.getLocation(currentTimeZone));

var androidPlatformChannelSpecifics = AndroidNotificationDetails(
      'your_channel_id', 'your_channel_name',
      importance: Importance.max, priority: Priority.high, ticker: 'ticker');
var platformChannelSpecifics = NotificationDetails(
         android: androidPlatformChannelSpecifics);
 

var date = tz.TZDateTime.now(tz.local).add(const Duration(seconds: 5));

await flutterLocalNotificationsPlugin.zonedSchedule(
    0,
    'scheduled title',
    'scheduled body',
    date,
    platformChannelSpecifics,
    androidScheduleMode: AndroidScheduleMode.exactAllowWhileIdle);

}

This works when the app is in the background, but it doesn't work if the device is locked. I need a sound signal when the device is locked.

Here is permissions in AndroidManifest.xml:

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
<uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM" />
<uses-permission android:name="android.permission.WAKE_LOCK" />

Do I need to use Full-screen intent notifications to get notifications when device is locked?

• android
• flutter
• notifications
• android-notifications
• android-permissions

1 Answer 1

Android devices may not allow notifications when the screen is locked for battery optimization. For this reason, I recommend ignoring battery optimization.

<uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />

If you also use a notification service, you also need this permission on Android 9+ versions.

<uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>