Android UI SurfaceView的使用-绘制组合图型，并使其移动

绘制容器类：

//图形绘制容器
public class Contanier {
	private List<Contanier> list;
	private float x=0,y=0;
	public Contanier(){
		list=new ArrayList<Contanier>();
	}
	public void draw(Canvas canvas){
		canvas.save();
		canvas.translate(getX(), getY());
		childrenDraw(canvas);
		for(Contanier c : list){
			c.draw(canvas);
		}
		canvas.restore();
	}
	public void childrenDraw(Canvas canvas){

	}
	public void addChildren(Contanier child){
		list.add(child);
	}
	public void removeChildren(Contanier child){
		list.remove(child);
	}
	public float getX() {
		return x;
	}
	public void setX(float x) {
		this.x = x;
	}
	public float getY() {
		return y;
	}
	public void setY(float y) {
		this.y = y;
	}

}

绘制正方型类：

//绘制正方型
public class Rect extends Contanier {

	private Paint paint;
	public Rect(){
		paint=new Paint();
		paint.setColor(Color.RED);
	}

	@Override
	public void childrenDraw(Canvas canvas) {
		super.childrenDraw(canvas);
		canvas.drawRect(0, 0, 100, 100, paint);
		this.setY(getY()+1);
	}
}

绘制圆：

//绘制圆
public class Circle extends Contanier {

	private Paint paint;
	public Circle(){
		paint=new Paint();
		paint.setColor(Color.BLUE);
	}
	@Override
	public void childrenDraw(Canvas canvas) {
		super.childrenDraw(canvas);
		canvas.drawCircle(50, 50, 50, paint);

	}
}

绘制类：

public class GameView extends SurfaceView implements Callback{

	private Contanier contaier;
	private Rect rect;
	private Circle circle;
	public GameView(Context context) {
		super(context);
		contaier=new Contanier();
		rect=new Rect();
		circle=new Circle();
		rect.addChildren(circle);
		contaier.addChildren(rect);
		getHolder().addCallback(this);
	}

	private void draw(){
		Canvas canvas=getHolder().lockCanvas();
		canvas.drawColor(Color.WHITE);
		contaier.draw(canvas);
		getHolder().unlockCanvasAndPost(canvas);
	}

	private Timer timer=null;
	private TimerTask task=null;

	//开始后让其根据Y轴进行移动
	private void startTimer(){
		timer=new Timer();
		task=new TimerTask() {
			@Override
			public void run() {
				draw();
			}
		};
		timer.schedule(task, 100,100);
	}
	private void stopTimer(){
		if(timer!=null){
			timer.cancel();
			timer=null;
		}
	}
	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {

	}

	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		startTimer();
	}

	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
		stopTimer();
	}

}

MainActivity:

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

效果：