Android's KitKat included a number of new features, and this recent two-part tutorial from Bolot Kerimbaev at Big Nerd Ranch covers one of them: the android.transition framework. The framework includes functionality for what Android calls "scenes" and "transitions," the former being the encapsulated state of a view hierarchy, and the latter a tool to create animations when moving from scene to scene. Kerimbaev's articles provide a solid tutorial to help you get started with android.transition.
The first part walks you through some simple animations - moving buttons, image fade-ins, and that sort of thing - while the second part digs a little deeper into techniques, particularly working with transitions in XML. So, if you're not up to speed on android.transition yet, check out Kerimbaev's tutorial to help you get started.