Loading data with FirebaseUI from Realtime Database

[Norman Laudien]

Hello,

i try to figure out how to exactly load data from Realtime Database into my RecyclerView using FirebaseRecyclerAdapter.

I have found out that in onChildChanged() the correct snapshots are loaded, but onCreateViewHolder() and onBindViewHolder() never get called.

Thanks in advance.

@NonNull
@Override
protected RecyclerView.Adapter onCreateRecyclerViewAdapter() {
    Query query = FirebaseDatabase.getInstance().getReference("lexiconCandidates")
            .orderByChild("readyToApprove")
            .equalTo(true);
    FirebaseRecyclerOptions<Lexicon> options = new FirebaseRecyclerOptions.Builder<Lexicon>()
            .setLifecycleOwner(this)
            .setQuery(query, Lexicon.class)
            .build();
    return new FirebaseRecyclerAdapter<Lexicon, LexiconViewHolder>(options) {
        @NonNull
        @Override
        public LexiconViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
            ListItemLexiconBinding binding = DataBindingUtil.inflate(layoutInflater, R.layout.list_item_lexicon, parent, false);
            return new LexiconViewHolder(binding);
        }

        @Override
        protected void onBindViewHolder(@NonNull LexiconViewHolder holder, int position, @NonNull Lexicon lexicon) {
            holder.bind(lexicon);
        }

        @Override
        public void onError(@NonNull DatabaseError error) {
            super.onError(error);
            Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
        }
        
        
    };
}

[Samuel Stern]

Hi Norman,

Have you called startListening() on the adapter?  Have you added a LayoutManager to the RecyclerView?  Those are two common reasons for the issue you are seeing.

- Sam

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[Norman Laudien]

Thanks for your answer. I forgot to set a layout manager that was it... thank you.