Question

我创建了一个弹跳球的动画（通过下面的代码）。

我想知道如何在特定条件下停止此动画，例如10秒后或当球到达特定坐标时。

代码：

public class MyDemoView extends ImageView{
    private Context mContext;

    int x = -1;
    int y = -1;
    private int xVelocity = 10;
    private int yVelocity = 5;
    private Handler h;
    private final int FRAME_RATE = 30;

    public MyDemoView(Context context, AttributeSet attrs)  {
        super(context, attrs);
        mContext = context;
        h = new Handler();
    }

    private Runnable r = new Runnable() {
        @Override
        public void run() {
            invalidate();
         }
    };

    protected void onDraw(Canvas c) {
        BitmapDrawable ball = (BitmapDrawable) mContext.getResources().getDrawable(R.drawable.ball);

        if (x<0 && y <0) {
            x = this.getWidth()/2;
            y = this.getHeight()/2;
        } else {
            x += xVelocity;
            y += yVelocity;

            if ((x > this.getWidth() - ball.getBitmap().getWidth()) || (x < 0)) {
                xVelocity = xVelocity*-1;
            }

            if ((y > this.getHeight() - ball.getBitmap().getHeight()) || (y < 0)) {
                yVelocity = yVelocity*-1;
            }
        }

        c.drawBitmap(ball.getBitmap(), x2, y2, null);
        h.postDelayed(r, FRAME_RATE);
    }
}

Answer 1

要停止动画，请使用以下代码：

object.clearAnimation();

或

animation.cancel();

后者可能不适用于2.1，不记得。

Answer 2

根据您的代码，只需致电h.removeCallbacks(r)？

如何停止动画

2 个答案: