Android : Allow Users To Choose Themes In Droid List View?

I have a listview with two labels, title and subtitle. I want to have dark and light background as user options. Title has textAppearanceMedium and subtitle has textAppearanceSmall. I want the style, MyTheme.Dark to have white color text and MyTheme.Light to have black color text. Is there a way to define multiple textAppearance attribute for the same TextView widget?

<style name="MyTheme.Dark">
<item name="android:windowBackground">@color/black</item>
<item name="android:colorBackground">@color/black</item>
<item name="android:background">@color/black</item>
<item name="android:divider">@color/white</item>
--cannot put textAppearance here since it is different for title and subtitle
</style>