Android 9 Development Cookbook - Third Edition

How it works...

There are four steps to setting this up:

1. Create a MediaSession.Callback and attach it to MediaSession
2. Set the MediaSession flags to indicate we want media buttons
3. Set SessionState to active
4. Set PlayBackState with the actions we're going to handle

Steps 4 and 1 work together as the callback will only get the events set in the PlayBackState.

Since we're not actually controlling any playback in this recipe, we just demonstrate how to respond to the hardware events. You'll want to implement actual functionality in PlayBackState and include a call to setState() after the setActions() call.

This is a very nice example of how the changes to the API can make things easier. And since the new MediaSession and PlaybackState were rolled ...