Not the best way to do it in my opinion.
You should do, in res/values/styles.xml, something like:
<style name="AppBaseTheme" parent="...">
<item name="android:actionBarStyle">@style/mActionBar</item>
</style>
<style name="mActionBar" parent="@android:style/Widget.Holo.Light.ActionBar">
<item name="android:background">...</item>
<item name="android:icon">...</item>
<item name="android:titleTextStyle">...</item>
</style>