Litho is a new and open sourced UI rendering framework from Facebook! It's declarative, enables background thread layout, and is heavily optimized for scrollable surfaces. Take a step-by-step tour of the library and follow along as we build simple to moderately complex UI elements.
I've been working on the Facebook for Android app for the past 5 years. In that time, I've worked on scroll performance for News Feed and rewritten the rendering infrastructure for News Feed twice. I'm a Litho wizard, a scroll performance guru, and I am sometimes lucky enough to stumble my way through Flexbox.