// onPause and onResume hooks are required so OneSignal knows when to create a notification and when to just call your callback and playtime for segmentation. // To save on adding these hooks to every Activity in your app it might be worth extending android.app.Activity to include this logic if you have many Activity classes in your App. // Anther option is to use this library https://github.com/BoD/android-activitylifecyclecallbacks-compat protected internal override void onPause() { base.onPause(); OneSignal.onPaused(); }