It's just an example of material transition.
Folio is a Page based navigation framework for Android with a simplified lifecycle and easy transition animations.
MaterialToolbar makes it easy to build a Fragment navigation based application with fully customized toolbar views.
Fragment Back Stack manages fragments on a single activity and maintain back press.
Routable is an in-app native URL router, for Android.
Demo project that uses Mortar and Mortar architect libraries, along with Dagger2.