Given to the ringtone picker as a Android.Net.Uri. The Android.Net.Uri of the current ringtone, which will be used to show a checkmark next to the item for this Android.Net.Uri. If showing an item for "Default" (@see RingtoneManager.ExtraRingtoneShowDefault), this can also be one of NoType:android/provider/Settings$System;Href=../../../reference/android/provider/Settings.System.html#DEFAULT_RINGTONE_URI, NoType:android/provider/Settings$System;Href=../../../reference/android/provider/Settings.System.html#DEFAULT_NOTIFICATION_URI, or NoType:android/provider/Settings$System;Href=../../../reference/android/provider/Settings.System.html#DEFAULT_ALARM_ALERT_URI to have the "Default" item checked.