Turn on/off scrolling of collapsing toolbar

MovieDetailsFragment.java

private void setupScrolling() {
        NestedScrollView scroll = findViewById(R.id.movie_details_scroll);
        CollapsingToolbarLayout collapsing = findViewById(R.id.toolbar_layout);

        boolean canScroll = Utils.canScroll(scroll);
        int scrollFlags = 0;
        if (canScroll) {
            scrollFlags = AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL |
                    AppBarLayout.LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED;
        }
        AppBarLayout.LayoutParams lp = (AppBarLayout.LayoutParams) collapsing.getLayoutParams();
        lp.setScrollFlags(scrollFlags);
        collapsing.setLayoutParams(lp);
    }

Utils.java

public static boolean canScroll(NestedScrollView scrollView) {
        View child = scrollView.getChildAt(0);
        if (child != null) {
            int childHeight = child.getHeight();
            return scrollView.getHeight() < childHeight + scrollView.getPaddingTop() + scrollView.getPaddingBottom();
        }
        return false;
  }