CustomGoogleMapInfoWindow.cs

    public class CustomGoogleMapInfoWindow : Java.Lang.Object, GoogleMap.IInfoWindowAdapter
    {
        private Activity m_context;
        private View m_View;
        private Marker m_currentMarker;

        public CustomGoogleMapInfoWindow(Activity context)
        {
            m_context = context;
            m_View = m_context.LayoutInflater.Inflate(Resource.Layout.CustomGoogleMapInfoWindow, null);
        }

        public View GetInfoWindow(Marker marker)
        {
            //Use the default info window
            return null;
        }

        public View GetInfoContents(Marker marker)
        {
            if (marker == null)
                return null;

            m_currentMarker = marker;

            ImageView imageview = m_View.FindViewById<ImageView>(Resource.Id.CustomGoogleMapInfoWindow_imageview);
            TextView textviewTitle = m_View.FindViewById<TextView>(Resource.Id.CustomGoogleMapInfoWindow_textview_title);
            TextView textviewDescription = m_View.FindViewById<TextView>(Resource.Id.CustomGoogleMapInfoWindow_textview_description);
            RatingBar ratingBar = m_View.FindViewById<RatingBar>(Resource.Id.CustomGoogleMapInfoWindow_ratingbar);

            if (marker.Title != null && marker.Title.Contains("Grenoble"))
                imageview.SetImageResource(Resource.Drawable.logo_grenoble);

            textviewTitle.Text = marker.Title;

            textviewDescription.Text = marker.Snippet;

            ratingBar.Rating = 5;

            return m_View;
        }
    }