public void OpenUrlInGoogleMaps()
    {
        string url = "http://www.google.com/maps/dir/?api=1&origin=22.553600,88.409969&destination=22.569272,88.406490&waypoints=22.558090,88.411363|22.561650,88.408066|22.561955,88.407858";
        Application.OpenURL(url);
    }