android - 动画 RelativeLayout 边距变化

Question

代码:

RelativLayout.LayoutParams params = (RelativLayout.LayoutParams) view1.getLayoutParams();
params.setMargins(50, 0, 0, 0);
view1.setLayoutParams(params);

上面的代码工作正常，但我想为它制作动画。

Answer 1

您可以像这样使用 ValueAnimator:

ValueAnimator varl = ValueAnimator.ofInt(50);
varl.setDuration(4000);
varl.addUpdateListener(new AnimatorUpdateListener() {

    @Override
    public void onAnimationUpdate(ValueAnimator animation) {
        RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) view1.getLayoutParams();
        lp.setMargins((Integer) animation.getAnimatedValue(), 0, 0, 0);
        view1.setLayoutParams(lp);      
    }
});
varl.start();

ValueAnimator 可从 Honeycomb 获得，但您拥有 NineOldAndroids 端口。