DinamicChangeAppbarScrollBehavior.java

  boolean exit;
  
  appBar.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
            @Override
            public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
                Log.d("onOffsetChanged", "appbar verticalOffset: " + verticalOffset);

                if (verticalOffset == 0 && !exit) {
                    AppBarLayout.LayoutParams params = (AppBarLayout.LayoutParams) collapsingToolbar.getLayoutParams();
                    params.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL | AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED); // list other flags here by |
                    collapsingToolbar.setLayoutParams(params);
                    exit = true;
                } else if (verticalOffset <= -300 && rvUserProfile.computeVerticalScrollOffset() <= 25 && exit) {
                    AppBarLayout.LayoutParams params = (AppBarLayout.LayoutParams) collapsingToolbar.getLayoutParams();
                    params.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL | AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS); // list other flags here by |
                    collapsingToolbar.setLayoutParams(params);
                    exit = false;
                }
            }
        });
        rvUserProfile.setOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                if (dy < 0 && recyclerView.computeVerticalScrollOffset() <= 25 && exit) {
                    AppBarLayout.LayoutParams params = (AppBarLayout.LayoutParams) collapsingToolbar.getLayoutParams();
                    params.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL | AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS); // list other flags here by |
                    collapsingToolbar.setLayoutParams(params);
                    exit = false;
                } else if (dy > 0 && recyclerView.computeVerticalScrollOffset() >= 25 && !exit) {
                    AppBarLayout.LayoutParams params = (AppBarLayout.LayoutParams) collapsingToolbar.getLayoutParams();
                    params.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL | AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED); // list other flags here by |
                    collapsingToolbar.setLayoutParams(params);
                    exit = true;
                }
            }
        });