Expand appbarlayout when recyclerview is scrolled/fling to top

Question

I implemented a collapsingtoolbar layout with a recyclerview as shown in the sample code attached. My issue is that, when I fling the list downward, it does not go all the way t

Answer 1

I had similar problem and I used a simple trick to expand AppBarLayout when RecyclerView fling to top (you need to have support library >= 23.x.x)

mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                if (newState == RecyclerView.SCROLL_STATE_IDLE) {
                    int firstVisiblePosition = linearLayoutManager.findFirstCompletelyVisibleItemPosition();
                    if (firstVisiblePosition == 0) {
                        mAppBarLayout.setExpanded(true, true);
                    }
                }
            }
});