androidのview游戏框架

public class MainActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //隐去标题栏（应用程序的名字）  
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        //隐去状态栏部分(电池等图标和一切修饰部分)
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        //设置显示View实例
        setContentView(new MyView(this));
    }
}

public class MyView extends View {
	private int textX = 20, textY = 20;
	//重写父类构造函数
	public MyView(Context context) {
		super(context);
		setFocusable(true);
	}

	//重写父类绘图函数
	@Override
	protected void onDraw(Canvas canvas) {
		//创建一个画笔的实例
		Paint paint = new Paint();
		//设置画笔的颜色
		paint.setColor(Color.WHITE);
		//绘制文本
		canvas.drawText("Game", textX, textY, paint);
		super.onDraw(canvas);
	}

        //重写按键抬起事件函数
	@Override
	public boolean onKeyUp(int keyCode, KeyEvent event) {
		return super.onKeyUp(keyCode, event);
	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
		//获取用户手指触屏的X坐标赋值与文本的X坐标
		textX = (int)event.getX();
		//获取用户手指触屏的Y坐标赋值与文本的Y坐标
		textY = (int)event.getY();
		//重绘画布
		invalidate();
		//postInvalidate();
		return true;
	}
}