PopupWindow 弹出动画

1. 设置进场动画

setAnimationStyle(R.style.PictureThemeWindowStyle);

 <style name="PictureThemeWindowStyle">
        <item name="android:windowEnterAnimation">@anim/picture_anim_album_show</item>
        <item name="android:windowExitAnimation">@anim/picture_anim_album_dismiss</item>
    </style>

picture_anim_album_show

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="350"
    android:interpolator="@anim/picture_anim_overshoot_interpolator">
    <scale
        android:fromXScale="1.0"
        android:fromYScale="0.0"
        android:interpolator="@android:anim/accelerate_interpolator"
        android:toXScale="1.0"
        android:toYScale="1.0" />
</set>

picture_anim_album_dismiss

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="350">
    <alpha
        android:fillAfter="true"
        android:fillBefore="false"
        android:fromAlpha="1.0"
        android:toAlpha="0" />
</set>