0. What does it do?

Why would I need Simple-Stack?

As Dianne Hackborn from the Android development team once said:

Once we have gotten in to this entry-point (Activity) to your UI, we really don't care how you organize the flow inside. Make it all one activity with manual changes to its views, use fragments (a convenience framework we provide) or some other framework, or split it into additional internal activities. Or do all three as needed.

Simple-Stack allows you to easily manage the flow inside your Activity, whether you're using Fragments, Views, or whatever else - with minimal extra effort, but with maximum reliability and customizability in return.