<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android">   <translate     android:fromXDelta="0"     android:toXDelta="0"     android:fromYDelta="120"     android:toYDelta="0"     android:duration="500" /> </set>

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android">   <translate     android:fromXDelta="0"     android:toXDelta="0"     android:fromYDelta="0"     android:toYDelta="120"     android:duration="500" /> </set>PopupWindow的動畫顯示效果是通過setAnimationStyle(int id)方法設置的，其中id為一個style的id，所以我們要在styles.xml文件中設置一個動畫樣式：<style name="popwin_anim_style">   <item name="android:windowEnterAnimation">@anim/menushow</item>   <item name="android:windowExitAnimation">@anim/menuhide</item></style>

PopupWindow pop = new PopupWindow(view, ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);pop.setAnimationStyle(R.style.popwin_anim_style);