SurfaceView(8)自定义SurfaceView的简单示例

代码如下：

public class CustomSurfaceView extends SurfaceView implements SurfaceHolder.Callback{
    
    private Paint paint;
    private Container container;
    private Circle circle;
    private Rect rect;
    
    private Timer timer;
    private TimerTask timerTask;
    
    public void startTimer(){
        timer = new Timer();
        timerTask = new TimerTask() {
            @Override
            public void run() {
                draw();
            }
        };
        timer.schedule(timerTask, 100,100);
    }
    public void stopTimer(){
        if (timer != null) {
            timer.cancel();
        }
    }
    public void draw(){
        int h = getHeight();
        int w = getWidth();
        Canvas canvas = getHolder().lockCanvas();
        canvas.drawColor(Color.WHITE);
        canvas.drawRect(w/4, h/4, 200, 200, paint);

        canvas.save();
        canvas.rotate(45,w/2,h/2);
        canvas.drawText("text", w/2, h/2, paint);
        canvas.restore();
        
        canvas.drawLine(0, 0, w, h, paint);
        canvas.drawLine(w, 0, 0,h, paint);
        
        
        container.draw(canvas);
        getHolder().unlockCanvasAndPost(canvas);
    }
    
    public CustomSurfaceView(Context context) {
        super(context);
        paint = new Paint();
        paint.setColor(Color.RED);
        getHolder().addCallback(this);
        container = new Container();
        rect = new Rect();
        circle = new Circle();
        rect.addChildView(circle);
        container.addChildView(rect);
    }
    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        startTimer();
    }

    //在surface的大小发生改变时激发
    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
    }

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

}