The Wayback Machine - https://web.archive.org/web/20151229090004/http://developer.xamarin.com:80/api/namespace/Android.Service.Wallpaper/

Android Guides | Samples

Android.Service.Wallpaper Namespace

Remarks

Type	Reason
WallpaperService	A wallpaper service is responsible for showing a live wallpaper behind applications that would like to sit on top of it.
WallpaperService+Engine	The actual implementation of a wallpaper.