You can implement a "style selector" using different XML styles.
Just define a theme called "StyleSelector" or something like this in /res/**values**/styles.xml:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="ThemeSelector" parent="@android:style/Theme.Black">
... Your theme definitions
</style>
</resources>
Then create /res/**values-v11**/styles.xml:
<resources>
<style name="ThemeSelector" parent="@android:style/Theme.Holo">
</style>
</resources>
@style/ThemeSelector ", Android .
Android Holo, Holo.