[移动开发]移动开发---View宽高自动拉伸动画

//这里是设置的高拉伸动画
        val viewLWrapper = ViewHWrapper(anyView)
        val ofInt = ObjectAnimator.ofInt(viewLWrapper, "trueHeight", 800, 0)
        ofInt.addListener(object : Animator.AnimatorListener{
            override fun onAnimationStart(p0: Animator?) {
            }
            override fun onAnimationEnd(p0: Animator?) {
                sxLayout.gone()
            }

            override fun onAnimationCancel(p0: Animator?) {
            }

            override fun onAnimationRepeat(p0: Animator?) {
            }
        })
        ofInt.setDuration(300).start()

 private class ViewHWrapper(private val mTarget: View) {
        //必须调用，不然高度改变,UI不会刷新
        var trueHeight: Int
            get() = mTarget.layoutParams.height
            set(height) {
                mTarget.layoutParams.height = height
                mTarget.requestLayout() //必须调用，不然高度改变,UI不会刷新
            }
    }