Determine if action bar is split

I have a MapView with an action bar powered by ActionBarSherlock. The action bar is both split (on "narrow" screens) and overlayed / semi-transparent (android:windowActionBarOverlay is true). More or less like the Google Maps app.

Now I would like to push views on top of the map, at the bottom of the screen still keeping it above the bottom action bar. My problem here is that I don't know the height of the bottom action bar. Frankly, I can't even find a way to know if it's drawn or not. getHeight() seems to return the height of the top action bar (or perhaps it's the height of both of them but I still don't know if the bottom action bar exists or not.

Please, tell me this information is right in front of my eyes!