Android licensing server real use scenario?

Question

It seems like the example they give for the licensing server uses the main activities window to display licensing. I'm wondering what is a realworld example that uses the licensing server.

Use their main sample activity and if it allows go right to your actual main activity?

It seems like there should be a sample that checks access with NO UI but pops up a UI only in the case of a licensing problem. That sounds more realworld to me.

Is there some example code that shows an example like that somewhere?

Thanks