是想顯示在某個控件的底部?

popupWindow.showAsDropDown(view_main, 0, 0);

用這個方法就可以讓popupWindow顯示在view_main的下面.

后面的那兩個參數是水平和豎直方向的偏移量.

在styles.xml文件中添加如下代碼：

??<style?name="AnimationFade">
????????<!--?PopupWindow彈出的效果?-->
????????<item?name="android:windowEnterAnimation">@anim/poupshow</item>
????????<item?name="android:windowExitAnimation">@anim/pouphide</item>
????</style>

res/anim/pouphide.xml

<?xml?version="1.0"?encoding="utf-8"?>
<set?xmlns:android="http://schemas.android.com/apk/res/android">
????<scale??
????????android:duration="100"??
????????android:fillAfter="false"??
????????android:fromXScale="1.0"??
????????android:fromYScale="0.0"??
????????android:interpolator="@android:anim/accelerate_interpolator"??
????????android:pivotY="100%"??
????????android:toXScale="1.0"??
????????android:toYScale="1.0"?/>??

</set>

res/anim/poupshow.xml
<?xml?version="1.0"?encoding="utf-8"?>
<set?xmlns:android="http://schemas.android.com/apk/res/android">
?????<scale??
????????android:duration="200"??
????????android:fillAfter="false"??
????????android:fromXScale="1.0"??
????????android:fromYScale="1.0"??
????????android:interpolator="@android:anim/accelerate_interpolator"??
????????android:pivotY="100%"??
????????android:toXScale="1.0"??
????????android:toYScale="0.0"?/>??
</set>

popupWindow.setAnimationStyle(R.style.popup_animation);

設置動畫

<style name="popup_animation " parent="android:Animation">

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

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

?</style>

動畫還得自己寫