ScrollStateListener not work with fastscroller

[ivametal]

I implement onScrollStateChanged method in RecyclerView and it works great, i want to show scroller when recycler dragged and i succesfully do it. But when i try to scroll by fastscroller recycler wont notify onScrollStateListener and nothing happened.

It works only when i drag recycler without scroller, how can i make it work with fastscroller too?

RecyclerViewScrollListener onScrollListener = new RecyclerViewScrollListener(mFastScroller) {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                switch (newState) {
                    case RecyclerView.SCROLL_STATE_DRAGGING :
                        Animation fadeInAnimation = AnimationUtils
                                .loadAnimation(IMContactsListFragment.this.getContext(), R.anim.fade_in);
                        mFastScroller.startAnimation(fadeInAnimation);
                        mFastScroller.setVisibility(View.VISIBLE);
                        break;
                    case RecyclerView.SCROLL_STATE_IDLE :
                        Animation fadeOutAnimation = AnimationUtils
                                .loadAnimation(IMContactsListFragment.this.getContext(), R.anim.fade_out);
                        mFastScroller.startAnimation(fadeOutAnimation);
                        mFastScroller.setVisibility(View.GONE);
                        break;
                }
            }
        };