CommandButton	A button for a SessionCommand or that can be displayed by controllers.
CommandButton.Builder	A builder for CommandButton.
DefaultMediaDescriptionAdapter	Default implementation of PlayerNotificationManager.MediaDescriptionAdapter.
LibraryResult<V>	A result to be used with for asynchronous calls between MediaLibraryService.MediaLibrarySession and MediaBrowser.
MediaBrowser	Browses media content offered by a MediaLibraryService in addition to the MediaController functions.
MediaBrowser.Builder	A builder for MediaBrowser.
MediaConstants	Constants that can be shared between media session and controller.
MediaController	A controller that interacts with a MediaSession, a MediaSessionService hosting a MediaSession, or a MediaLibraryService hosting a MediaLibraryService.MediaLibrarySession.
MediaController.Builder	A builder for MediaController.
MediaLibraryService	Superclass to be extended by services hosting media library sessions.
MediaLibraryService.LibraryParams	Parameters for the interaction between MediaBrowser and MediaLibraryService.MediaLibrarySession.
MediaLibraryService.LibraryParams.Builder	A builder for MediaLibraryService.LibraryParams.
MediaLibraryService.MediaLibrarySession	An extended MediaSession for the MediaLibraryService.
MediaLibraryService.MediaLibrarySession.Builder	A builder for MediaLibraryService.MediaLibrarySession.
MediaNotification	A notification for media playbacks.
MediaSession	A session that allows a media app to expose its transport controls and playback information in a process to other processes including the Android framework and other apps.
MediaSession.Builder	A builder for MediaSession.
MediaSession.ConnectionResult	A result for MediaSession.SessionCallback to denote the set of commands that are available for the given controller.
MediaSession.ControllerInfo	Information of a MediaController or a MediaBrowser.
MediaSessionService	Superclass to be extended by services hosting media sessions.
MediaStyleNotificationHelper	Class containing media specfic styles that you can use with NotificationCompat.Builder.setStyle(NotificationCompat.Style).
MediaStyleNotificationHelper.DecoratedMediaCustomViewStyle	Notification style for media custom views that are decorated by the system.
MediaStyleNotificationHelper.MediaStyle	Notification style for media playback notifications.
PlayerNotificationManager	Starts, updates and cancels a media style notification for a MediaSession.
PlayerNotificationManager.BitmapCallback	Receives a `Bitmap`.
PlayerNotificationManager.Builder	A builder for PlayerNotificationManager instances.
SessionCommand	A command that a MediaController can send to a MediaSession.
SessionCommands	A set of session commands.
SessionCommands.Builder	A builder for SessionCommands.
SessionResult	A result to be used with for asynchronous calls between MediaSession and MediaController.
SessionToken	A token that represents an ongoing MediaSession or a service (MediaSessionService, MediaLibraryService, or MediaBrowserServiceCompat).

MediaBrowser.Listener	A listener for events from MediaLibraryService.
MediaController.Listener	A listener for events and incoming commands from MediaSession.
MediaLibraryService.MediaLibrarySession.MediaLibrarySessionCallback	An extended for the MediaLibraryService.MediaLibrarySession.
MediaNotification.ActionFactory	Creates and `pending intents` for notifications.
MediaNotification.Provider	Provides media notifications to be posted as notifications that reflect the state of a MediaController and to send media commands to a MediaSession.
MediaNotification.Provider.Callback	Receives updates for a notification.
MediaSession.MediaItemFiller	An object which fills in the fields of a MediaItem from MediaController.
MediaSession.SessionCallback	A callback to handle incoming commands from MediaController.
PlayerNotificationManager.MediaDescriptionAdapter	An adapter to provide content assets of the media currently playing.
PlayerNotificationManager.NotificationListener	A listener for changes to the notification.

LibraryResult.Code	Result codes.
MediaNotification.ActionFactory.Command	Commands that can be included in a media action.
PlayerNotificationManager.Priority	Priority of the notification (required for API 25 and lower).
PlayerNotificationManager.Visibility	Visibility of notification on the lock screen.
SessionCommand.CommandCode	Command codes of session commands.
SessionResult.Code	Result codes.
SessionToken.TokenType	Types of SessionToken.