popwindow动画显示消失，activity切换动画

popwindow通过setAnimationStyle(int animationStyle)函数来设置动画效果
android:windowEnterAnimation表示进入窗口动画
android:windowExitAnimation表示窗口退出动画

在res/values/style.xml代码：

<?xml version="1.0" encoding="utf-8"?>  
<resources>     
    <mce:style name="PopupAnimation" parent="android:Animation"><!--  
        <item name="android:windowEnterAnimation">@anim/popup_enter</item>  
        <item name="android:windowExitAnimation">@anim/popup_exit</item>  
      
--></mce:style><style name="PopupAnimation" parent="android:Animation" mce_bogus="1">        <item name="android:windowEnterAnimation">@anim/popup_enter</item>  
        <item name="android:windowExitAnimation">@anim/popup_exit</item>  
    </style>  
</resources>  

在res/anim/popup_enter.xml声明所需进入动画

<?xml version="1.0" encoding="utf-8"?>      
<set xmlns:android="http://schemas.android.com/apk/res/android">  
    <scale android:fromXScale="0.6" android:toXScale="1.0"  
        android:fromYScale="0.6" android:toYScale="1.0" android:pivotX="50%"  
        android:pivotY="50%" android:duration="1000" />  
    <alpha android:interpolator="@android:anim/decelerate_interpolator"  
        android:fromAlpha="0.0" android:toAlpha="1.0" android:duration="1000" />  
</set>  

在res/anim/popup_exit.xml声明所需退出动画

<?xml version="1.0" encoding="utf-8"?>  
<set xmlns:android="http://schemas.android.com/apk/res/android">  
    <scale  
        android:fromXScale="1.0"  
        android:toXScale="0.5"  
        android:fromYScale="1.0"  
        android:toYScale="0.5"  
        android:pivotX="50%"  
        android:pivotY="50%"  
        android:duration="500" />  
    <alpha  
        android:interpolator="@android:anim/accelerate_interpolator"  
        android:fromAlpha="1.0"  
        android:toAlpha="0.0"  
        android:duration="500" />  
</set>  

设置popwindow的位置及动画

        popupWindow.setAnimationStyle(R.style.PopupAnimation);
        popupWindow.showAtLocation(findViewById(R.id.parent), Gravity.CENTER| Gravity.CENTER, 0, 0);
        popupWindow.update();

调用popupWindow.dismiss();语句。popwindow消失，自动调用消失动画popup_exit.xml

activity切换动画

public void onClick(View v) {
                Intent intent = new Intent(ActivityAnim.this,ActivityTwo.class);
                startActivity(intent);               
                overridePendingTransition(R.anim.act_enter,R.anim.act_exit);               
  }

overridePendingTransition(int ,int)函数，第一个参数为activity显示动画，第二个参数为退出动画，两个动画的xml文件存放在anim文件夹下

Android入门第十篇之PopupWindow
http://blog.csdn.net/hellogv/archive/2010/10/21/5956358.aspx