Animation

   mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                if (newState == RecyclerView.SCROLL_STATE_IDLE) {
                    final View tb = getActivity().findViewById(R.id.toolbar);
                    tb.animate()
                            .translationY(0)
                            .setInterpolator(new LinearInterpolator())
                            .setDuration(180)
                            .setListener(new AnimatorListenerAdapter() {
                                @Override
                                public void onAnimationStart(Animator animation) {
                                    tb.setVisibility(View.VISIBLE);
                                }
                            });
                } else if (newState == RecyclerView.SCROLL_STATE_DRAGGING) {
                    final View tb = getActivity().findViewById(R.id.toolbar);
                    tb.animate()
                            .translationY(tb.getHeight())
                            .setInterpolator(new LinearInterpolator())
                            .setDuration(180)
                            .setListener(new AnimatorListenerAdapter() {
                                @Override
                                public void onAnimationEnd(Animator animation) {
                                    tb.setVisibility(View.GONE);
                                }
                            });

                }
            }
        });