PopupWindow添加动画效果

1.定义PopupWindow弹出与消失的两个动画文件,放在anim文件夹下

popup_enter.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:fromYDelta="100%p"
        android:toYDelta="0"
        android:duration="1000"/>
    <alpha
        android:fromAlpha="0.0"
        android:toAlpha="1.0"
        android:duration="1000"/>
</set>

popup_exit.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:fromYDelta="0"
        android:toYDelta="100%p"
        android:duration="1000"/>
    <alpha
        android:fromAlpha="1.0"
        android:toAlpha="0.0"
        android:duration="1000"/>
</set>

2.styles.xml文件中注册这两个动画效果

<resources>
    <style name="popupAnimation">
        <item name="android:windowEnterAnimation">@anim/popup_enter</item>
        <item name="android:windowExitAnimation">@anim/popup_exit</item>
    </style>
</resources>

3.为创建的PopopWindow添加动画

inflater = getLayoutInflater();
layout = inflater.inflate(R.layout.menu, null);
menu = new PopupWindow(layout, WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.WRAP_CONTENT);
menu.setAnimationStyle(R.style.popupAnimation);//添加动画