Learning Java by Building Android Games - Second Edition

Coding the UIController class

This class will have the same purpose as the class of the same name did in the previous project. It will also look very similar too.

Add a new class called UIController and add the member variables, constructor and addObserver method.

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

import java.util.ArrayList;

class UIController implements InputObserver {

    private float mThird;

    private boolean initialPress = false;

    UIController(GameEngineBroadcaster b, Point size) {
        // Add as an observer
        addObserver(b);

        mThird = size.x / 3;
    }

    
    void addObserver(GameEngineBroadcaster b) {
        b.addObserver(this);
    }
}

The float mThird variable will help us to divide the screen up vertically into thirds. ...