让 Popwindow 向上弹出

/**
     * 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();
    }

valuesstyle.xml:

<resources>
<style name="AnimationPopup">
    <item name="@android:windowEnterAnimation">@anim/appear</item>
    <item name="@android:windowExitAnimation">@anim/disappear</item>
</style>
</resources>

animappear.xml

<?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>

animdisappear.xml

<?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>

点击屏幕其他部分实现使其消失的功能需要在showAtLocation方法调用前设置下面代码：

pop.setBackgroundDrawable(new PaintDrawable());
        pop.setOutsideTouchable(true);