Quick fragment switching view binding null

Question

I have 2 fragments in a tab layout, switching between them quickly causes the views to be returned as null, using ViewBinding. Is this because of the delay to build the FragmentXBinding class?

Usage Example:

chatadapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
            @Override
            public void onItemRangeInserted(int positionStart, int itemCount) {
                binding.chatRecyclerView.smoothScrollToPosition(0);
            }
        });

Error:

java.lang.NullPointerException: Attempt to read from field 'androidx.recyclerview.widget.RecyclerView com.iku.databinding.FragmentChatBinding.chatRecyclerView' on a null object reference

Your `binding`is null .make sure you are initializing view binding inside `onCreateView` — chand mohd, Sep 02 '20 at 13:48
it is inside `onCreateView` and I get it while switching across fragments really quickly. — Abhishek AN, Sep 02 '20 at 17:27
ohhh .. in that case initialize your binding inside `onViewCreated(...)` — chand mohd, Sep 02 '20 at 17:50
@ThomasBernhard I was not completely! But putting the code related to view binding in `onViewCreated(..)` is better and had to remove few realtime listeners in the app to avoid this NPE. Even detaching the listener in `onStop()` — Abhishek AN, Dec 25 '20 at 21:44

score 0 · Answer 1 · answered Apr 05 '21 at 23:52

FragmentX

 FragmentXBinding binding;


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    binding = FragmentChatBinding.inflate(inflater, container, false);
    init();
    return binding.getRoot();
}

 private void init() {
    // all initialization 
}

This helps me to solve my error with null reference

Quick fragment switching view binding null

1 Answers1