title: How to add draggable scrollbar to scrollview/listview in Android?
body: <p>I have a listView that uses a customListAdapter created by me. When user scrolls the list, he/she sees scrolling indicator as usual on the right side.</p>
  
  <p>However, I want to show a draggable track-button on the right side, so user will be able to hold that button and quickly scroll through the list.</p>
  
  <p>How can I do this?</p>