I\'ve inherited the Holo Light Theme and customized the background of the ActionBar with the following:
Content of styles.xml
You can easily do this thing. If you would like to change Action Bar background image then you place this code to your res/styles.xml file.
For this you have to select an image from "drawable" folder . Here I select an image "tp_black_bg.png"
After that don't forget to declare this theme to your AndroidManifest.xml file
.............
Now you can reopen any XML layout file , you can easily see the effect. In the same way you can also able to change the background color of ActionBar.
Thanks.