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最近需求一个问题，想要在dialog消失时增加动画，之前如上一个文章中遇到的，但是最后改了实现方式，要求在特定的地方缩放，原来的dialog高度是wrap_content的，这样是无法实现的，因此首先需要将dialog的layout文件从wrap_content，改成match_parent，同时设置最外层布局背景透明。在dialog.show()之后，重新设置窗口属性

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"android:layout_width="match_parent"android:layout_height="match_parent"android:gravity="center"android:clipChildren="false"android:layoutDirection="ltr">此处省略内部内容</RelativeLayout>

        dialog?.show()dialog?.apply {window?.setLayout(WindowManager.LayoutParams.MATCH_PARENT,WindowManager.LayoutParams.MATCH_PARENT)}

紧接着我们就可以使用动画了，尤其是平移动画，原来dialog是wrap_content的时候，如何平移超过view，就会消失。当dialog变成match_parent后，就可以正常使用平移动画了。

思路：根据位置计算平移的距离进行平移，同时缩放

    private fun setAnim(dialog: Dialog) {dialog.apply {val animView = findViewById<View>(R.id.limited_layout)val height = animView?.height//此处是在计算相应的距离等内容val retainHeight = (screenHeight(context) - height!!) / 2 - DensityUtil.dp2px(ApplicationHelper.getInstance().context,84f) - getStatusBarHeight(context)val topHeight = DensityUtil.dp2px(ApplicationHelper.getInstance().context,80f)val transHeight = retainHeight - topHeight - DensityUtil.dp2px(ApplicationHelper.getInstance().context,28f).toFloat()val scaleAnimation = if (retainHeight < topHeight) {ScaleAnimation(1f, 0f,1f, 0f,Animation.RELATIVE_TO_SELF, 1f,Animation.RELATIVE_TO_SELF,((topHeight + DensityUtil.dp2px(ApplicationHelper.getInstance().context,28f) - retainHeight) / height.toFloat()))} else {ScaleAnimation(1f, 0f,1f, 0f,Animation.RELATIVE_TO_SELF, 1f,Animation.RELATIVE_TO_SELF, 0f)}val translationAnimator = if (retainHeight > topHeight) {TranslateAnimation(0f,0f,0f,-transHeight)} else {null}translationAnimator?.let {val animationSet = AnimationSet(true)scaleAnimation.duration = 300animationSet.addAnimation(scaleAnimation)val alphaAnimation = AlphaAnimation(1f, 0f)alphaAnimation.duration = 300it.duration = 300animationSet.addAnimation(it)animationSet.addAnimation(alphaAnimation)animView.startAnimation(animationSet)animationSet.setAnimationListener(object : Animation.AnimationListener {override fun onAnimationStart(animation: Animation?) {// 动画开始时的操作}override fun onAnimationEnd(animation: Animation?) {mLimitedDialog?.let { dismiss() }}override fun onAnimationRepeat(animation: Animation?) {// 动画重复时的操作}})} ?: run {val animationSet = AnimationSet(true)scaleAnimation.duration = 300animationSet.addAnimation(scaleAnimation)val alphaAnimation = AlphaAnimation(1f, 0f)alphaAnimation.duration = 300animationSet.addAnimation(alphaAnimation)animView.startAnimation(animationSet)animationSet.setAnimationListener(object : Animation.AnimationListener {override fun onAnimationStart(animation: Animation?) {// 动画开始时的操作}override fun onAnimationEnd(animation: Animation?) {mLimitedDialog?.let { dismiss() }}override fun onAnimationRepeat(animation: Animation?) {}})}}}