void IEventNotification.RegisterEvent(DateTime eventDate, Action action)
{
// oder Implementierung über alarmManager (dann auch wenn App offline)
// http://stackoverflow.com/questions/24196890/android-schedule-task-to-execute-at-specific-time-daily
Handler h = new Handler ();
var ms = SystemClock.UptimeMillis ();
var msSinceUpTime = eventDate.MsSinceUpTime (ms);
h.PostAtTime (action, msSinceUpTime);
Diag.Debug.WriteLine ("Event in " + msSinceUpTime + " and " + eventDate.ToString ());
}
