Flutter. Scheduled Android notifications when device is locked

Question

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?

twice_flutter · Accepted Answer · 2025-04-03 06:55:47Z

0

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"/>

answered Apr 3 at 6:55

twice_flutter

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4 Comments

Dima Apr 3 at 9:39

As far as I know, this is a dangerous permission, Google doesn't like its use.

Heshan Sandeepa Apr 3 at 10:04

<uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" /> Google doesn't allow the use of this permission unless "Battery optimization" is the key concern of your app. They rarely accept it, even if you try to convince them. Avoid this permission. Instead, prompt users to enable optimization manually themselves.

twice_flutter Apr 3 at 10:57

await Permission.ignoreBatteryOptimizations.request()

Dima Apr 3 at 15:56

But I see apps on android that play sounds and notifications on a locked device without asking for this permission. Maybe there is another way?

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