The final piece is to detect which shortcut the user is gazing at and respond to a trigger (click) by launching the app.
When we launch a new app from this one, we need to reference the MainActivity object. One way to do it is to make it a singleton object. Let's do that now. Note that you can get into trouble defining activities as singletons. Android can launch multiple instances of a single Activity class, but even across apps, static variables are shared.
At the top of the MainActivity class, add an instance variable:
public static MainActivity instance;
Initialize it in onCreate:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
instance = this;Now in MainActivity, add a handler to the Cardboard trigger:
@Override
public void onCardboardTrigger(){
overlayView.onTrigger();
}Then, in OverlayView, add the following method:
public void onTrigger() {
shortcuts...