Thank you for contacting the Android team.
I confirmed that the xml attribute does not apply in the Xamarin Wrappers. I will log this as an issue and it will be fixed. Thank you for reporting this. We appreciate your feedback!
Regarding setting the selection mode from code, you should do the following for Xamarin:
And setting the value:
RadCalendarView calendar = FindViewById (Resource.Id.calendarView).JavaCast<RadCalendarView>();
calendar.SelectionMode = CalendarSelectionMode.Single;
This should work as expected. Let me know if you still have any troubles.
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