官方原文：http://developer.android.com/training/basics/actionbar/styling.html
针对3.0以上的版本：
<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:android="http://schemas.android.com/apk/res/android">
<style name="CustomActionBarTheme" parent="@android:style/Theme.Holo.Light.DarkActionBar">
<item name="android:actionBarStyle">@style/CustomBackground</item>
</style>
<style name="CustomBackground" parent="@android:style/Widget.Holo.Light.ActionBar.Solid.Inverse">
<item name="android:background">@drawable/actionbar_background</item>
</style>
<style
name="CustomActionBarOverlayTheme"
parent="@android:style/Theme.Holo"
>
<item name="android:windowActionBarOverlay">true</item>
</style>
</resources>
针对3.0以下版本：要导入v7兼容包。
<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="CustomActionBarTheme" parent="@style/Theme.AppCompat.Light.DarkActionBar">
<item name="actionBarStyle">@style/CustomBackground</item>
</style>
<style name="CustomBackground" parent="@style/Widget.AppCompat.Light.ActionBar.Solid.Inverse">
<item name="background">@drawable/actionbar_background</item>
</style>
<style
name="CustomActionBarOverlayTheme"
parent="@style/Theme.AppCompat"
>
<item name="windowActionBarOverlay">true</item>
</style>
</resources>