Get the last visible RecyclerView element

Question

findLastVisibleItemPosition returns -1 with the following sequence:

 onViewCreated() { recyclerView.setAdapter(adapter = new Adapter()); adapter.updateContent(List<Content>); // will call notifyItemRangeChanged post(new Runnable() { run() { layoutManager.getLastVisibleItem(); // == -1 (using runnable or not) } } } 

It seems that the views of the children are not yet ready. Using a tree viewer in RecyclerView seems to solve the problem, but what is the best approach to get the last visible item after setting the adapter contents right after creation?