Behavior of Actionbar can also be changed in APIs < 11
See the Android Official Documentation for reference
I am building an app with minSdkVersion = "9" and targetSdkVersion = "21" I changed the color of action bar and it works fine with API level 9
Here is an xml
res/values/themes.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
    <!-- the theme applied to the application or activity -->
    <style name="CustomActionBarTheme"
           parent="@style/Theme.AppCompat.Light.DarkActionBar">
        <item name="android:actionBarStyle">@style/MyActionBar</item>
        <!-- Support library compatibility -->
        <item name="actionBarStyle">@style/MyActionBar</item>
    </style>
    <!-- ActionBar styles -->
    <style name="MyActionBar"
           parent="@style/Widget.AppCompat.Light.ActionBar.Solid.Inverse">
        <item name="android:background">@color/actionbar_background</item>
        <!-- Support library compatibility -->
        <item name="background">@color/actionbar_background</item>
    </style>
</resources>
and set the color of actionbar you want
res/values/colors.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="actionbar_background">#fff</color> //write the color you want here
</resources>
Actionbar color can also be defined in .class file, the snippet is
ActionBar bar = getActionBar();
bar.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#0000ff")));
but this will not work with the API < 11, so styling the actionbar in xml is only way for API < 11