themes/overlaystub/res/values/arrays.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="themes">
        <item>default</item>
        <item>omni</item>
        <item>space</item>
        <item>red</item>
        <item>nature</item>
    </string-array>
</resources>