您必须用你想放的背景图像创建你自己的风格。在您的style.xml，你应该建立类似这样：

You have to create your own style with the image you want to put on background. In your style.xml, you should create something similar to this:

值/ styles.xml

    <style name="Theme.MyAppTheme" parent="@style/Theme.AppCompat.Light">
        <item name="actionBarStyle">@style/ActionBarTabStyle.MyAppTheme</item>
    </style>

    <style name="ActionBar.Solid.MyAppTheme" parent="@style/Widget.AppCompat.Light.ActionBar.Solid">
        <item name="background">@drawable/your_background_image</item>
    </style>

值-V14 / styles.xml

    <style name="Theme.MyAppTheme" parent="@style/Theme.AppCompat.Light">
        <item name="android:actionBarStyle">@style/ActionBarTabStyle.MyAppTheme</item>
    </style>

    <style name="ActionBar.Solid.MyAppTheme" parent="@style/Widget.AppCompat.Light.ActionBar.Solid">
        <item name="android:background">@drawable/your_background_image</item>
    </style>

和您可以使用此9片图像：

and you can use this 9-patch image :