直播短视频源码，实现简单布局收缩的动画相关源码：

private fun showOrhide(
		//收缩部分
        linearLayout: LinearLayout,
        //旋转箭头
        taskDetailArrow: RelativeLayout
    ) {
        val scrollView = binding.scrollView
        val rect = Rect()
        linearLayout.getGlobalVisibleRect(rect)
        val arrow = taskDetailArrow.getChildAt(1)
        if (linearLayout.visibility == View.VISIBLE) {
            arrow.rotation = 180f
            ObjectAnimator.ofFloat(
                linearLayout,
                "translationY",
                0.0f, -linearLayout.measuredHeight.toFloat()
            ).apply {
                duration = 500
                interpolator = AccelerateInterpolator()
                start()
            }.addListener(object : Animator.AnimatorListener {
                override fun onAnimationRepeat(animation: Animator?) {
                }

                override fun onAnimationEnd(animation: Animator?) {
                    linearLayout.visibility = View.GONE
                    scrollView.post {
                        scrollView.smoothScrollTo(0, rect.bottom);
                    }
                }

                override fun onAnimationCancel(animation: Animator?) {
                }

                override fun onAnimationStart(animation: Animator?) {

                }
            })

        } else {
            arrow.rotation = 0f
            ObjectAnimator.ofFloat(
                linearLayout,
                "translationY",
                -linearLayout.measuredHeight.toFloat(), 0.0f
            ).apply {
                duration = 500
                interpolator = AccelerateInterpolator()
                start()
            }.addListener(object : Animator.AnimatorListener {
                override fun onAnimationRepeat(animation: Animator?) {
                }

                override fun onAnimationEnd(animation: Animator?) {
                    linearLayout.visibility = View.VISIBLE
                    scrollView.post {
                        scrollView.smoothScrollTo(0, rect.bottom);
                    }
                }

                override fun onAnimationCancel(animation: Animator?) {
                }

                override fun onAnimationStart(animation: Animator?) {
                }
            })
        }

根据传入的View的visibility来执行收缩或者展开，scrollView不是找不到而是最外层布局
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