/**

      * 获取父控件的位置y-popwindow的高度 = 应该显示的y坐标.   x这里设置为center 不刻意指定坐标  注意:控件坐标永远是 左上角坐标!

      *

      * @param parent

      */

     public void showUp(View parent) {

         int[] location = new int[2];

         parent.getLocationOnScreen(location);

         popupWindow.setFocusable(true);

         popupWindow.setOutsideTouchable(true);

         popupWindow.setAnimationStyle(R.style.AnimationPopup);

         popupWindow.showAtLocation(parent, Gravity.CENTER_HORIZONTAL

                 | Gravity.TOP, 0, location[1] - popupWindow.getHeight() + 20);

         popupWindow.update();

     }

 <resources>

 <style name="AnimationPopup">

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

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

 </style>

 </resources>

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

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

     <scale

         android:duration="500"

         android:fromXScale="1.0"

         android:fromYScale="0.5"

         android:pivotX="0%"

         android:pivotY="100%"

         android:toXScale="1"

         android:toYScale="1" />

     <alpha

         android:duration="500"

         android:fromAlpha="0.5"

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

         android:toAlpha="1.0" />

 </set>

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

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

     <scale

         android:duration="500"

         android:fromXScale="1.0"

         android:fromYScale="1"

         android:pivotX="0%"

         android:pivotY="100%"

         android:toXScale="1"

         android:toYScale="0.5" />

     <alpha

         android:duration="500"

         android:fromAlpha="1.0"

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

         android:toAlpha="0.0" />

 </set>

 pop.setBackgroundDrawable(new PaintDrawable());

         pop.setOutsideTouchable(true);