async void GetDirection()
{
getDirectionButton.Visibility = Android.Views.ViewStates.Invisible;
startTripButton.Visibility = Android.Views.ViewStates.Visible;
directionDrawn = true;
centerMarker.Visibility = Android.Views.ViewStates.Invisible;
string key = Resources.GetString(Resource.String.mapkey);
ShowProgressDialogue("Getting Directions", false);
string directionJson = await mapHelper.GetDirectionJsonAsync(mypostion, destinationPoint, key);
map.Clear();
mapHelper.DrawPolylineOnMap(directionJson, map);
CloseProgressDialogue();
}
