A Android.Preferences.Preference that allows the user to choose a ringtone from those on the device. The chosen ringtone's URI will be persisted as a string.

If the user chooses the "Default" item, the saved string will 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. If the user chooses the "Silent" item, the saved string will be an empty string.

[Android Documentation]