Here you go - http://developer.android.com/about/versions/android-4.4.html#UI
Translucent system bars
You can now make the system bars partially translucent with new
themes, Theme.Holo.NoActionBar.TranslucentDecor and
Theme.Holo.Light.NoActionBar.TranslucentDecor. By enabling translucent
system bars, your layout will fill the area behind the system bars, so
you must also enable fitsSystemWindows for the portion of your layout
that should not be covered by the system bars.
If you're creating a custom theme, set one of these themes as the
parent theme or include the windowTranslucentNavigation and
windowTranslucentStatus style properties in your theme.
