ActionBar simple background color setting

Write the following code in the res\values\style file:

<style name="CustomActionBarTheme" parent="@android:style/Theme.Holo.Light">
        <item name="android:actionBarStyle">@style/MyActionBar</item>
    </style>
    
    <style name="MyActionBar" parent="@android:style/Widget.Holo.Light.ActionBar">
        <item name="android:background">#f4842d</item>
    </style>		

This is a custom orange background

Then set the theme in the AndroidManifest.xml file

You can modify the background of the ActionBar