Extending styles and themes confusion
<activity android:name=".MyActivity"
     android:label="@string/app_name"
        name="Theme.NoTitleBar"...

<style name="Theme.NoTitleBar.new_skin" parent="android:Theme">
        <item name="text_body_read">@style/text_body_read</item>
        <item name="text_body_unread">@style/text_body_unread</item>
    </style>

<activity android:name=".MyActivity"
     android:label="@string/app_name"
        name="MyTheme"...

<style name="MyTheme" parent="android:Theme.NoTitleBar">
        <item name="text_body_read">@style/text_body_read</item>
        <item name="text_body_unread">@style/text_body_unread</item>
 </style>

<style name="MyTheme.Widget.ListView" parent="@android:style/Widget.ListView.White">
</style>