Simple game engine using Canvas for Android - using for quick prototype or simple games

android_game.java

package com.gamarist.momoney;

import android.os.Bundle;
import android.R.integer;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.Window;

public class MoMoney extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(new GameView(this));
    }
    
}

class GameView extends View {
	
	private GameLoop mainLoop;
	Bitmap gameBitmap;
	Canvas gameCanvas;
	
	public GameView(Context context) {
		super(context);
		this.setDrawingCacheEnabled(true);
		
		gameCanvas = new Canvas();
		
		mainLoop = new GameLoop(getResources(), gameCanvas);
		mainLoop.start();
	}
	
	@SuppressLint("DrawAllocation") @Override
	 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
	  
	  int w = MeasureSpec.getSize(widthMeasureSpec);
	  int h = MeasureSpec.getSize(heightMeasureSpec);
	  
	  gameBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
	  
	  gameCanvas.setBitmap(gameBitmap);
	    
	  setMeasuredDimension(w, h);
	 }
	
	@Override
	public void onDraw(Canvas canvas) {
		canvas.drawBitmap(gameBitmap, 0, 0, new Paint());
		invalidate();
	}

}

class GameLoop extends Thread {
	
	private float frameRate = 60;
	private float frameTime = 1000 / frameRate;
	
	private Game logicGame;
	private Resources gameResources;
	private Canvas gameCanvas;
	
	public GameLoop(Resources res, Canvas canvas) {
		logicGame = new Game(res, canvas);
	}
	
	@Override
	public void run()
	{
		while (true) {
			float startTime = System.currentTimeMillis();
			
			logicGame.Update();
			logicGame.Draw();
			
			float endTime = System.currentTimeMillis();
			long deltaTime = (long) (frameTime - (endTime - startTime));
			try {
				Thread.sleep(deltaTime);
			} catch (InterruptedException e) {
			}
		}
	}
	
}

class Game {
	private Resources resources;
	private Canvas canvas;
	
	private int x = 0;
	private Paint paint;
	
	public Game(Resources res, Canvas cas) {
		resources = res;
		canvas = cas;
		
		paint = new Paint();
		paint.setTextSize(50);
	}
	
	public void Draw() {
		canvas.drawColor(Color.WHITE);
		canvas.drawRect(new Rect(x, 0, x + 50, 50), paint);
	}
	
	public void Update() {
		x += 1;
		Log.d("DEBUG", "X: " + x);
	}
}