Les styles associés sous Android

Bonjour
Voici comment définir les styles associés sous Android:

<style name="WindowTitleBackground">
<item name="android:background">@drawable/title_bar</item>
</style>

<style name="WindowTitle" parent="@android:style/WindowTitle">
<item name="android:textAppearance">@style/TextAppearance.WindowTitle</item>
</style>

<style name="TextAppearance.WindowTitle" parent="@android:style/TextAppearance.WindowTitle">
<item name="android:textStyle">bold|italic</item>
</style>