private async Task RegisterExternalServicesAsync()
{
using var scope = _scopeFactory.CreateScope();
_bumper = scope.ServiceProvider.GetRequiredService <IBumpManager>();
_bumper.OnNotify += OnBumperNotifyAsync;
_activityManager = scope.ServiceProvider.GetRequiredService <IActivityManager>();
_activityManager.OnNotification += OnActivityNotificationAsync;
_activityManager.OnUpdated += OnActivityUpdatedAsync;
_activityManager.OnDisabled += OnActivityDisabledAsync;
_activityManager.OnCreated += OnActivityCreatedAsync;
_activityManager.OnRescheduled += OnActivityRescheduledAsync;
await _activityManager.InitAsync();
_musicPlayer = scope.ServiceProvider.GetRequiredService <IMusicPlayer>();
_musicPlayer.OnUpdate += OnMusicPlayerUpdateAsync;
}