bachinger 99086b4007 Add default implementation of Callback.onSubscribe
The library already maintains the subscribed controllers internally. This
change adds `MediaLibrarySession.getSubscribedControllers(mediaId)` to
access subscribed controllers for a given media ID.

To accept a subscription, `MediaLibraryService.Callback.onSubscribe` is
required to return `RESULT_SUCCESS`. So far, this isn't the case for the
default implementation of the library.

This change implements `Callback.onSubscribe` to conditionally
provide `RESULT_SUCCESS`. The default calls `Callback.onGetItem(mediaId)` to
assess the availability of the media item. If the app retruns `RESULT_SUCCESS`
with a browsable item, the subscription is accepted. If receiving a valid item
fails, the subscription is rejected.

Issue: androidx/media#561
PiperOrigin-RevId: 568925079
2023-09-27 12:19:34 -07:00
..
2021-10-27 09:12:46 +01:00
2021-10-27 09:12:46 +01:00

Media session demo

This app demonstrates use of media sessions. It's a reference app written in Kotlin, which demonstrates best practices for media apps that want to advertise media sessions.

See the demos README for instructions on how to build and run this demo.