SceneManager.java

package com.example.jason.a4x4;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.view.MotionEvent;

import java.util.ArrayList;

/**
 * Created by JASON on 9/4/2018.
 */

public class SceneManager {
    private ArrayList<Scene> scenes = new ArrayList<>();
    public static int ACTIVE_SCENE;
    public static int WIDTH;
    public static int HEIGHT;
    private boolean scoreSceneFlag;

    public SceneManager(Context context){
        ACTIVE_SCENE = 0;
        WIDTH = Resources.getSystem().getDisplayMetrics().widthPixels;
        HEIGHT = Resources.getSystem().getDisplayMetrics().heightPixels;
        scoreSceneFlag = true;
        scenes.add(new MainMenuScene(context));
        scenes.add(new GameplayScene(context));
        scenes.add(new ScoreScene(context));
    }
    public void receiveTouch(MotionEvent event){
        scenes.get(ACTIVE_SCENE).receiveTouch(event);
    }

    public void update() {
        //slow down update rate of ScoreScene
        //only updates when scene 2 is opened
        if(ACTIVE_SCENE == 2){
            if(scoreSceneFlag){
                scenes.get(ACTIVE_SCENE).update();
                scoreSceneFlag = false;
            }
        }
        else {
            scoreSceneFlag = true;
            scenes.get(ACTIVE_SCENE).update();
        }

    }

    public void draw(Canvas canvas){
        scenes.get(ACTIVE_SCENE).draw(canvas);
    }
}