QuickScroll is a library aimed at creating similar scrolling experiences to the native Contacts app's People view. It has the same scrolling capabilities as the ListView's native fast-scroll, but comes with a much a much more customizable design, two indicator styles and an always visible scrollbar. The two most common modes are popup and indicator. Works seamlessly with
Scroll + discover = DiscrollView
You can apply some transformation on discroll:
ObservableScrollView is an Android library to observe scroll events on scrollable views.
It's easy to interact with the Toolbar introduced in Android 5.0 Lollipop and may be helpful to implement look and feel of Material Design apps.
This is an open source library which uses the scroll bar library. Clock widget was added inside the scroll bar panel which gives a Path 2.0 like effect and can be customized according to your needs.