Under the Hood: Building and open-sourcing the Rebound animation library for Android

This post introduces and open-sources the Rebound animation library for Android. It details the motivations behind its creation, stemming from the need for physics-based animations that were difficult to achieve with Android's time-based animation frameworks. The post explains the underlying concepts of spring forces and damping, contrasts Rebound with existing Android animation APIs and full physics engines like Box2d, and provides examples of its usage for creating natural-feeling UI interactions like those seen in Chat Heads and Facebook Home. It also highlights the library's portability to JavaScript.