Android Dev Summit, October 23-24: two days of technical content, directly from the Android team. Sign-up for livestream updates.

androidx.media.app

Classes

NotificationCompat Class containing media specfic styles that you can use with NotificationCompat.Builder.setStyle(NotificationCompat.Style)
NotificationCompat.DecoratedMediaCustomViewStyle Notification style for media custom views that are decorated by the system. 
NotificationCompat.MediaStyle Notification style for media playback notifications.