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Returns a Android.Database.ICursor of all the ringtones available. The returned cursor will be the same cursor returned each time this method is called, so do not Android.Database.ICursor.Close the cursor. The cursor can be Android.Database.ICursor.Deactivate safely.
If RingtoneManager(Android.App.Activity) was not used, the caller should manage the returned cursor through its activity's life cycle to prevent leaking the cursor.