defaultUri

The uri to the sound to play when the user previews "default" sound. This can be one of System#DEFAULT_RINGTONE_URI, System#DEFAULT_NOTIFICATION_URI, or System#DEFAULT_ALARM_ALERT_URI to have the "Default" point to the current sound for the given default sound type. If you are showing a ringtone picker for some other type of sound, you are free to provide any Uri here.