I try this:
Uri ringtoneUri = "content://media/internal/audio/media/55";
Ringtone ringtone = RingtoneManager.getRingtone(context, ringtoneUri);
String name = ringtone.getTitle(context);
and I got result: name = 55, not a normal title like "common name"
I also saw Get the Ringtone title from RingtonePreference but there no accepted answer