Xamarin Android ILocationListener

GeoFencingHelper.cs

	[Service]
	[IntentFilter(new[] { "com.sdtig.Todo.START_LOCATION", "com.sdtig.Todo.SET_GEOFENCE" })]
	public class GeofencingHelper : Service, Android.Locations.ILocationListener
	{
		public override Android.OS.IBinder OnBind (Intent intent)
		{
			return null;
		}

		public override void OnStart (Intent intent, int startId)
		{
			if (intent.Action == "com.sdtig.Todo.START_LOCATION")
			{
		  	//Elided
			}
			if (intent.Action == "com.sdtig.Todo.SET_GEOFENCE")
			{
				SetFence();
			}
		}
		 

		public void SetFence()
		{
			bool isWithinRadius = false;
			foreach (var fence in fences)
			{
				float[] results = new float[1];
				Location.DistanceBetween(fence.Latitude, fence.Longitude, currentLatitude, currentLongitude, results);
				float distanceInMeters = results[0];
				if (distanceInMeters < radiusInMeters)
				{
					isWithinRadius = true;
					break;
				}
			}

			if (!isWithinRadius)
			{
				var intent = new Intent(CustomActions.TODO_WITHIN_PROXIMITY);
				PendingIntent pendingIntent = PendingIntent.GetService(this, 0, intent, 
					PendingIntentFlags.UpdateCurrent);
				_locationManager.AddProximityAlert(currentLatitude, currentLongitude, 
					radiusInMeters, -1, pendingIntent);
			}
		}
	}