用setAnimationStyle来设置popwindow显示消失的动画效果

popwindow通过setAnimationStyle(int animationStyle)函数来设置动画效果
android:windowEnterAnimation表示进入窗口动画
android:windowExitAnimation表示窗口退出动画

在res/values/style.xml代码：

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<?xml version="1.0"encoding="utf-8"?>   

<resources>      

   

<style name="PopupAnimation"parent="android:Animation"mce_bogus="1">        

        <item name="android:windowEnterAnimation">@anim/popup_enter</item>   

        <item name="android:windowExitAnimation">@anim/popup_exit</item>   

    </style>   

</resources>

在res/anim/popup_enter.xml声明所需进入动画

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<?xml version="1.0"encoding="utf-8"?>       

<set xmlns:android="http://schemas.android.com/apk/res/android">   

    <scale android:fromXScale="0.6"android:toXScale="1.0"

        android:fromYScale="0.6"android:toYScale="1.0"android:pivotX="50%"

        android:pivotY="50%"android:duration="1000"/>   

    <alpha android:interpolator="@android:anim/decelerate_interpolator"

        android:fromAlpha="0.0"android:toAlpha="1.0"android:duration="1000"/>   

</set>

在res/anim/popup_exit.xml声明所需退出动画

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<?xml version="1.0"encoding="utf-8"?>   

<set xmlns:android="http://schemas.android.com/apk/res/android">   

    <scale   

        android:fromXScale="1.0"

        android:toXScale="0.5"

        android:fromYScale="1.0"

        android:toYScale="0.5"

        android:pivotX="50%"

        android:pivotY="50%"

        android:duration="500"/>   

    <alpha   

        android:interpolator="@android:anim/accelerate_interpolator"

        android:fromAlpha="1.0"

        android:toAlpha="0.0"

        android:duration="500"/>   

</set>

设置popwindow的位置及动画

popupWindow.setAnimationStyle(R.style.PopupAnimation);
popupWindow.showAtLocation(findViewById(R.id.parent), Gravity.CENTER| Gravity.CENTER, 0, 0);
popupWindow.update();

调用popupWindow.dismiss();语句。popwindow消失，自动调用消失动画popup_exit.xml