Activity.java

private int googlePlayServicesAvailabilityRequestCode = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  MediaRouteButton mediaRouteButton = findViewById(R.id.media_route_button);
  CastButtonFactory.setUpMediaRouteButton(this, mediaRouteButton);

  // can't use CastContext until I'm sure the user has GooglePlayServices
  PlayServicesUtils.checkGooglePlayServicesAvailability(
    this,
    googlePlayServicesAvailabilityRequestCode,
    this::initChromecast
  );
}
    
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);

  // can't use CastContext until I'm sure the user has GooglePlayServices
  if(requestCode == googlePlayServicesAvailabilityRequestCode) {
    PlayServicesUtils.checkGooglePlayServicesAvailability(
      this,
      googlePlayServicesAvailabilityRequestCode,
      this::initChromecast
    );
  }
}

private void initChromecast() {
  new ChromecastYouTubePlayerContext(
    CastContext.getSharedInstance(this).getSessionManager(),
    new SimpleChromecastConnectionListener()
  );
}