IllegalStateException when adding data from onScrolledToNextPage method without any delay

[antunflas]

If RecyclerView has less items than it can maximum has visible (ie. RecyclerView can take 5 items on the screen, but adapter contains only 3 items) and it has set nextPageListener then IllegalStateException happens when adding next page without any delay.

Steps to reproduce:

1. add RecyclerView, set nextPageListener and add just few items in adapter (to take less than recycler size)
2. in onScrolledToNextPage add few more items (I used addAll method)

Workaround is to wrap code that is in onScrolledToNextPage into some runnable and post it on main handler.

Solution is to use main handler for posting task that would call nextPageListener.onScrolledToNextPage inside of onBindViewHolder method of MjolnirRecyclerAdapter.