Learning Java by Building Android Games - Second Edition

Coding a Multitouch UI controller and making it a listener

Create a new package private class and call it UIController.

Note

As already stated, later in the project we will also have another InputObserver based around the player spaceship game object, but we need to do a bit more theory in the next chapter before we can implement that.

Add some class imports, the implements InputObserver code to the class declaration and add the constructor as highlighted next.

import android.graphics.Point;
import android.graphics.Rect;
import android.view.MotionEvent;

import java.util.ArrayList;

class UIController implements InputObserver {

   public UIController(GameEngineBroadcaster b){
        b.addObserver(this);
    }
}

All we need to do in the constructor is call the ...