I was looking for implementing the same thing and I came up with a solution that is good enough (or maybe is really near what they have done).
So what I did was a single FrameLayout with both of the Layouts stacked together and then I just animate the top layout to slide to the right of the screen (just need to call the slideTo or scrollBy. And basically it's that! Quite simple and effective!
EDIT:
I've answered to a similar question here with some code samples, enjoy =): Click here