How to scroll to top of long ScrollView layout?

Question

For part of my app, the user is presented with a list of names and is asked to group them as they see fit.

(Note, the ListView code was copied verbatim from the And

Answer 1

runOnUiThread( new Runnable(){
   @Override
   public void run(){
      mainScrollView.fullScroll(ScrollView.FOCUS_UP);
   }
}