Android 9 Development Cookbook - Third Edition

How to do it...

We'll just be using Toast messages to respond to the hardware events and therefore will not need to make any changes to the activity layout. The first step is to add the V13 support library to the project. Start by opening build.gradle (Module: app) and perform the following steps:

1. Add the following library to the dependency section:

implementation 'com.android.support:support-v13:28.0.0-rc02'

2. Next, open ActivityMain.java and add the following mMediaSessionCallback to the class declaration:

MediaSessionCompat.Callback mMediaSessionCallback = new MediaSessionCompat.Callback() {    @Override    public void onPlay() {        super.onPlay();        Toast.makeText(MainActivity.this, "onPlay()", Toast.LENGTH_SHORT).show();    }    @Override    public void ...