I\'m using FirebaseRecyclerAdapter to populate a RecyclerView in a Fragment.
Here\'s my code
mDatabase = Firebase
Remove the recyclerView.setHasFixedSize(true) from your code and then check if the code works fine now.
And for dismissing the ProgressBar, its good to set the visibility to GONE.
mProgressBar.setVisibility(View.GONE);
For more information you can see this Github link. I think the same issue is reported here.