code: @Override
      public void onListScroll(View view, float deltaY) {
          int speed;
          if (view.getId() == mListViewLeft.getId() && !isLeftListEnabled) {
              speed = getSpeed(false, deltaY);
  
              mListViewRight.smoothScrollBy(speed, 0);
          } else if (view.getId() == mListViewRight.getId() && !isRightListEnabled) {
              speed = getSpeed(true, deltaY);
              mListViewLeft.smoothScrollBy(speed, 0);
          }
      }
docs: Receives the distance scroll on listView.