Android RecyclerView with fast scroll bar with alphabet

Fast scroll with alphabet on the scroll bar.

1. Customizing the RecyclerView. https://github.com/codexpedia/android_fast_scroll_with_alphabet/tree/master/fast_scroll_with_alphabet1

2. Creating an custom scroll bar view to work with the RecyclerView. https://github.com/codexpedia/android_fast_scroll_with_alphabet/tree/master/fast_scroll_with_alphabet2