Calling setContentView() multiple times is not recommended. The normal way to switch between layouts in the same activity is to use a ViewFlipper or FrameLayout (see Calling setContentView() multiple times and How can i make a dynamic flipping screen(like that of iPhone) in Android)
Alternatively you could use ViewSwitcher, which seems to fit your needs pretty well. There’s a good detailed tutorial available at http://inphamousdevelopment.wordpress.com/2010/10/11/using-a-viewswitcher-in-your-android-xml-layouts/