A simple, easy-to-use and configurable fast scroller for RecyclerView. As Kotlin compiles to Java, there's no need to externally add the Kotlin runtime or any other Kotlin dependencies when using this. Also the library is 100% compatible with Java and requires no migration of the base project to Kotlin. The base layout type for this fast scroller is a RelativeLayout so creating a simple vertical fast scroller is as simple as adding elements as children to the RecyclerViewFastScroller layout tag.