How to prevent alert with incoming OneSignal notification?

Question

I use OneSignal push notifications. When android app is in foreground and receives a notification, it creates an alert box with the notification. How to prevent this from appearing when receiving notifications?

Answer 1

It's changed in OneSignal 4.0.

For Kotlin:

OneSignal.setNotificationWillShowInForegroundHandler { notificationReceivedEvent ->
    notificationReceivedEvent.complete(null)
}

For Java:

OneSignal.setNotificationWillShowInForegroundHandler(new NotificationWillShowInForegroundHandler() {
  @Override
  void notificationWillShowInForeground(OSNotificationReceivedEvent notificationReceivedEvent) {    
     notificationReceivedEvent.complete(null);
  }
});