Video: https://www.youtube.com/watch?v=TCKb1WfjAC8
Layout previews are extremely powerful: they make it easy to find screens, modify existing layouts and help understand screen functionality without navigating the code. Even more, thanks to the Android Navigation components, layout previews can even serve as an always up to date wireframes of your app!
In this video, you will learn how to use the tools-attribute to enable layout previews, how to add realistic previews to RecyclerViews and how to provide your own custom sample data, including images.
This video comes with a large sample application https://bit.ly/transferwise-android