bottom_sheet_animation.java

...

  bottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
      @Override
      public void onStateChanged(View view, int i) {
        // ..
        // your code is here
      }

      @Override
      public void onSlide(View view, float v) {
        // ..
        // animating the view on top of Bottom Sheet
        yourView.animate().y(v <= 0 ? 
                             view.getY() + mSheetBehavior.getPeekHeight() - yourView.getHeight() : 
                             view.getHeight() - yourView.getHeight()).setDuration(0).start();
      }
    });
  
...