This project contains the code I made for my blog "Xamarin.Android - Grouping markers with the Google Map Cluster".
I use the Google Map API to add thousands of markers to a map. This project show an example of how to use ClusterManager to cluster markers. It show how to use ClusterRenderer and InfoWindowAdapter to customize your map. Finally, it show how to get seperate clustering for different types of marker.
Take a look : http://maximeesprit.com/fr/xamarin-android-googlemap-clustering/