让 Popwindow 向上弹出

 1 /**
 2      * 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!
 3      *
 4      * @param parent
 5      */
 6     public void showUp(View parent) {
 7
 8         int[] location = new int[2];
 9
10         parent.getLocationOnScreen(location);
11         popupWindow.setAnimationStyle(R.style.AnimationPopup);
12         popupWindow.showAtLocation(parent, Gravity.CENTER_HORIZONTAL
13                 | Gravity.TOP, 0, location[1] - popupWindow.getHeight() + 20);
14
15         popupWindow.setFocusable(true);
16         popupWindow.setOutsideTouchable(true);
17
18         popupWindow.update();
19     }

values\style.xml:

1 <resources>
2 <style name="AnimationPopup">
3     <item name="@android:windowEnterAnimation">@anim/appear</item>
4     <item name="@android:windowExitAnimation">@anim/disappear</item>
5 </style>
6 </resources>

anim\appear.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <set xmlns:android="http://schemas.android.com/apk/res/android" >
 3
 4
 5     <scale
 6         android:duration="500"
 7         android:fromXScale="1.0"
 8         android:fromYScale="0.5"
 9         android:pivotX="0%"
10         android:pivotY="100%"
11         android:toXScale="1"
12         android:toYScale="1" />
13
14
15     <alpha
16         android:duration="500"
17         android:fromAlpha="0.5"
18         android:interpolator="@android:anim/accelerate_interpolator"
19         android:toAlpha="1.0" />
20
21
22 </set>

anim\disappear.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <set xmlns:android="http://schemas.android.com/apk/res/android" >
 3
 4
 5     <scale
 6         android:duration="500"
 7         android:fromXScale="1.0"
 8         android:fromYScale="1"
 9         android:pivotX="0%"
10         android:pivotY="100%"
11         android:toXScale="1"
12         android:toYScale="0.5" />
13
14
15     <alpha
16         android:duration="500"
17         android:fromAlpha="1.0"
18         android:interpolator="@android:anim/accelerate_interpolator"
19         android:toAlpha="0.0" />
20
21
22 </set>