Main menu scene - AndEngine

package com.jong.angryballs;

import org.anddev.andengine.entity.scene.Scene;
import org.anddev.andengine.entity.scene.background.ColorBackground;
import org.anddev.andengine.entity.scene.Scene.IOnAreaTouchListener;
import org.anddev.andengine.entity.text.Text;
import org.anddev.andengine.input.touch.TouchEvent;
import org.anddev.andengine.opengl.font.Font;
import org.anddev.andengine.util.Callback;

public class MainMenuScene extends Scene implements IOnAreaTouchListener {
    // ===========================================================
    // Constants
    // ===========================================================
    public static final int MENU_START = 1;
    public static final int MENU_HISCORES = 2;
    public static final int MENU_CREDITS = 3;
    public static final int MENU_SETTINGS = 4;
    public static final int MENU_LEADERBOARDS = 5;

    public final static int CAMERA_WIDTH =  GameActivity.CAMERA_WIDTH;
    public final static int CAMERA_HEIGHT = GameActivity.CAMERA_HEIGHT;
    // ===========================================================
    // Fields
    // ===========================================================
    final Callback<Integer> mCallOnMenuClick;
    // ===========================================================
    // Constructors
    // ===========================================================
    /**
     * Creates a new main menu scene
     * @param pFont The font to use.
     * @param callOnMenuClick Called when a menu item is clicked.
     */
    public MainMenuScene(final Font pFont, Callback<Integer> callOnMenuClick) {
        super();
        this.mCallOnMenuClick = callOnMenuClick;

        final Text startText = new Text(0, 0, pFont, "Start");
        final Text hiscoresText = new Text(0, 0, pFont, "Hiscores");
        final Text leaderboardsText = new Text(0, 0, pFont, "Leaderboards");
        final Text settingsText = new Text(0, 0, pFont, "Settings");
        final Text creditsText = new Text(0, 0, pFont, "Credits");

        startText.setUserData(MENU_START);
        hiscoresText.setUserData(MENU_HISCORES);
        leaderboardsText.setUserData(MENU_LEADERBOARDS);
        settingsText.setUserData(MENU_SETTINGS);
        creditsText.setUserData(MENU_CREDITS);

        final float totalHeight = startText.getHeight() + 20 +  hiscoresText.getHeight() + 20 + leaderboardsText.getHeight() + 20 + settingsText.getHeight() + 20 + creditsText.getHeight();
        float maxWidth = Math.max(startText.getWidth(), hiscoresText.getWidth());
        maxWidth = Math.max(maxWidth, leaderboardsText.getWidth());
        maxWidth = Math.max(maxWidth, settingsText.getWidth());
        maxWidth = Math.max(maxWidth, creditsText.getWidth());

        final float x = CAMERA_WIDTH/2 - maxWidth/2;
        final float y = CAMERA_HEIGHT/2 - totalHeight/2;

        startText.setPosition(x, y);
        hiscoresText.setPosition(x, startText.getY() + startText.getHeight() + 20);
        leaderboardsText.setPosition(x, hiscoresText.getY() + hiscoresText.getHeight() + 20);
        settingsText.setPosition(x, leaderboardsText.getY() + leaderboardsText.getHeight() + 20);
        creditsText.setPosition(x, settingsText.getY() + settingsText.getHeight() + 20);

        this.attachChild(startText);
        this.attachChild(hiscoresText);
        this.attachChild(leaderboardsText);
        this.attachChild(settingsText);
        this.attachChild(creditsText);

        this.registerTouchArea(startText);
        this.registerTouchArea(hiscoresText);
        this.registerTouchArea(leaderboardsText);
        this.registerTouchArea(settingsText);
        this.registerTouchArea(creditsText);
        this.setOnAreaTouchListener(this);

        this.setBackgroundEnabled(true);
        this.setBackground(new ColorBackground(0.09804f, 0.6274f, 0.8784f));
    }
    // ===========================================================
    // Getter & Setter
    // ===========================================================

    // ===========================================================
    // Methods for/from SuperClass/Interfaces
    // ===========================================================
    @Override
    public boolean onAreaTouched(TouchEvent pSceneTouchEvent,
            ITouchArea pTouchArea, float pTouchAreaLocalX,
            float pTouchAreaLocalY) {
        if(pSceneTouchEvent.isActionDown()) {
            if(pTouchArea instanceof Text)
                this.mCallOnMenuClick.onCallback((Integer)((Text)pTouchArea).getUserData());
        }
        return false;
    }
    // ===========================================================
    // Methods
    // ===========================================================
    // ===========================================================
    // Inner and Anonymous Classes
    // ===========================================================
}