Can we replicate the "shadow" effect underneath the titlebar in android?

Question

There are two areas in particular where Android renders very elegant shadows underneath views: 1. Below the title bar 2. Just below the TabWidget

It's different than, say, a gradient view between two larger views. It gives the effect that the top view is floating![alt text][1] over the screen. I would attach an implementation seen in Foursquare, but I'm new here. They use it in their Tips Activity, for one example (google image Foursquare android and it will come up)