public override void OnCreate()
{
base.OnCreate ();
_iBeaconManager = IBeaconManager.GetInstanceForApplication (this);
_iBeaconManager.SetForegroundScanPeriod (2000);
_iBeaconManager.SetForegroundBetweenScanPeriod (2500);
_rangeNotifier = new RangeNotifier ();
_rangingRegion = new Region (monkeyId, UUID, null, null);
_iBeaconManager.Bind (this);
_rangeNotifier.DidRangeBeaconsInRegionComplete += RangingBeaconsInRegion;
}