Firestore into recyclerview using FirebaseUI, no data displayed - firebase

Question

I just got started with Firestore. So I tried fitting my data directly into a recyclerview, here's the code I used for reference.
Here's my UserRecyclerView Fragment :
public class UserRecyclerView extends Fragment{
private ArrayList<User> user;
RecyclerView mRecyclerView;
public UserRecyclerView(){}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.recycler_view,container,false);
mRecyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
FirestoreRecyclerAdapter adapter = getFirestoreRecyclerAdapter();
mRecyclerView.setAdapter(adapter);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
return view;
}
#NonNull
private FirestoreRecyclerAdapter getFirestoreRecyclerAdapter() {
Query query = FirebaseFirestore.getInstance()
.collection("users");
FirestoreRecyclerOptions<User> options = new FirestoreRecyclerOptions.Builder<User>()
.setQuery(query, User.class).build();
return new FirestoreRecyclerAdapter<User, UserViewHolder>(options) {
#Override
protected void onBindViewHolder(UserViewHolder holder, int position, User model) {
Log.d("USER", "DATA: "+model.getName());
holder.BindView(position, model);
}
#Override
public UserViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.users_list, parent, false);
return new UserViewHolder(view);
}
};
}
private class UserViewHolder extends RecyclerView.ViewHolder{
TextView info;
UserViewHolder(View itemView) {
super(itemView);
info = (TextView) itemView.findViewById(R.id.info_text);
}
void BindView(int position, User model){
info.setText(model.getName()+" , "+model.getId());
}
}
There's nothing in my MainActivity except for starting the above fragment. I don't know what's wrong with my code. It shows no errors, when I run the app it doesn't crash. It just enters into the recyclerview layout, I checked it by placing a textview field for being sure(now removed). I want you to help me out with the code. It's probably because of the adapter? Help me figure out. I have also uploaded a snippet of my database.
Thanks in advance!

Answer 1

Make sure you call startListening on the adapter to initiate the connection to Cloud Firestore, otherwise no data will be loaded.
#Override
protected void onStart() {
super.onStart();
adapter.startListening();
}
#Override
protected void onStop() {
super.onStop();
adapter.stopListening();
}
See:
https://github.com/firebase/FirebaseUI-Android/blob/master/firestore/README.md#firestorerecycleradapter-lifecycle

Answer 2

Create recyclerview like below:
FirestoreRecyclerAdapter adapter = getFirestoreRecyclerAdapter();
//add below line
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setAdapter(adapter);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));