ActioBar Transparent

style.xml

<!-- Application theme. -->
	<style name="MyTheme" parent="@android:style/Theme.Holo">
		<item name="android:windowActionBarOverlay">true</item>
		<item name="android:actionBarStyle">@style/MyTheme.ActionBar</item>
		<item name="android:windowContentOverlay">@null</item>
		<item name="android:windowBackground">@color/red_background</item>
	</style>
	<style name="MyTheme.ActionBar" parent="android:Widget.Holo.ActionBar">
		<item name="android:background">@android:color/transparent</item>
		<item name="android:backgroundStacked">@android:color/transparent</item>
		<item name="android:displayOptions">showTitle</item>
	 	<item name="android:titleTextStyle">@style/MyTheme.ActionBar.TitleTextStyle</item>
  </style>
 
  <style name="MyTheme.ActionBar.TitleTextStyle" parent="@android:style/TextAppearance.Holo.Widget.ActionBar.Title">
    <item name="android:fontFamily">sans-serif-light</item>
    <item name="android:textSize">20sp</item>
  </style>