簡單佈局收縮動畫

private fun showOrhide(
		//收縮部分
        linearLayout: LinearLayout,
        //旋轉箭頭
        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?) {
                }
            })
        }

根據傳入的View的visibility來執行收縮或者展開，scrollView不是找不到而是最外層佈局哦。