recyclerview hide toolbar

rvHideToobar

popularFeed.setOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                View toolbarholder = (getActivity().findViewById(R.id.hometoolbarholder));
                View toolbar = (getActivity().findViewById(R.id.toolbar));
                float y = recyclerView.getY();
                super.onScrolled(recyclerView, dx, dy);
                if (y < dy) {
                    toolbarholder.animate()
                            .translationY(-toolbar.getBottom())
                            .setInterpolator(new AccelerateInterpolator())
                            .start();
                } else {
                    toolbarholder.animate()
                            .translationY(0)
                            .setInterpolator(new AccelerateInterpolator())
                            .start();
                }
            }
        });