You can view all styles by looking at styles.xml in the Android SDK platforms folder. eg.
<your-sdk-dir>/platforms/android-16/data/res/values/styles.xml
looking at API level 16, this is what I see
<style name="Widget.ActionBar"> <item name="android:background">@android:drawable/action_bar_background</item> ...
if this resource is not publicly available, it is best to set the background and footer backgrounds to what you define. you do this by creating a theme in styles.xml and overriding the style of the action bar,
<style name="Theme" parent="@android:style/Theme.Holo.Light"> <item name="android:actionBarStyle">@style/ActionBar</item> </style>
now create the actual style of the action bar,
<style name="ActionBar" parent="android:style/Widget.Holo.Light.ActionBar"> <item name="android:background">@drawable/my_background</item> </style>
now assign this style to your application,
<application ... android:theme="@style/Theme" > ...
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