You can call setContentView() more than once.... I think that's what you're looking for.
But you may want to change activities, it all depends on how the user will want to see things and have the app react.
It is of course wise to plan on having your activities save data in onPause(), onStop() and onDestroy() and react appropriately when the activity is restarted, no matter which way you choose to display your content.
hth