Ytukyg

Hi i'm stuck on this part where i have 2 collections first one is users and second one is friends. I want my recyclerview to display my friends on the list with the help of current user because on currentUser other peoples id are stored and i want it to display it on the recyclerview but when it displays it i want to get their information from users where they have their username and email stored.

I want only friends collection ids to display on recyclerview with the help of current user id. Then i want to get values from users collection like their name and email value.

Friends collection
users collection

ADAPTER

public class FriendsAdapter extends FirestoreRecyclerAdapter {

private OnItemClicklistener onItemClicklistener;



public FriendsAdapter(@NonNull FirestoreRecyclerOptions<AllUsers> options) {

    super(options);

}



@Override

protected void onBindViewHolder(@NonNull FriendsHolder holder, int position, @NonNull AllUsers model) {

    holder.textViewUsername.setText(String.valueOf(model.getName()));

    holder.textViewEmail.setText(model.getEmail());

    holder.setAvatar(model.getAvatar());



}



@NonNull

@Override

public FriendsHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {

    View view = LayoutInflater.from(viewGroup.getContext())

            .inflate(R.layout.all_user_list_display, viewGroup, false);

    return new FriendsAdapter.FriendsHolder(view);

}



class FriendsHolder extends RecyclerView.ViewHolder {

    TextView textViewUsername;

    TextView textViewEmail;

    ImageView imageViewAvatar;



    public FriendsHolder(@NonNull View itemView) {

        super(itemView);



        textViewUsername = itemView.findViewById(R.id.all_user_username);

        textViewEmail = itemView.findViewById(R.id.all_user_userEmail);

        itemView.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View view) {

                int position = getAdapterPosition();

                if (position != RecyclerView.NO_POSITION && onItemClicklistener != null) {

                    onItemClicklistener.onItemClick(getSnapshots().getSnapshot(position), position);

                }

            }

        });

    }



    public void setAvatar(String avatar) {

        imageViewAvatar = (ImageView) itemView.findViewById(R.id.all_user_profile_image);

        Picasso.get().load(avatar).into(imageViewAvatar);

    }

}



public interface OnItemClicklistener {

    void onItemClick(DocumentSnapshot snapshot, int position);

}



public void setOnItemClickListener(FriendsAdapter.OnItemClicklistener listener) {

    onItemClicklistener = listener;

}

FriendListFragment

public class FriendsListFragment extends Fragment {



private FirebaseFirestore db;

private CollectionReference usersCollection;

private CollectionReference friendsCollection;

private DocumentReference friends;

private DocumentReference users;

private FirebaseUser current_user;



private FriendsAdapter adapter;

public SearchView search_friends;





public FriendsListFragment() {

    // Required empty public constructor

}





@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

                         Bundle savedInstanceState) {

    // Inflate the layout for this fragment

    View view = inflater.inflate(R.layout.fragment_friends, container, false);





    current_user = FirebaseAuth.getInstance().getCurrentUser();



    //FIREBASE

    db = FirebaseFirestore.getInstance();

    usersCollection = db.collection("users");

    friendsCollection = db.collection("friends");

    friends = friendsCollection.document(current_user.getUid());



    Query friendQuery = usersCollection;



    FirestoreRecyclerOptions<AllUsers> options = new FirestoreRecyclerOptions.Builder<AllUsers>()

            .setQuery(friendQuery, AllUsers.class)

            .build();



    adapter = new FriendsAdapter(options);

    RecyclerView recyclerView = view.findViewById(R.id.friendsList);

    recyclerView.setHasFixedSize(true);

    recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

    recyclerView.setAdapter(adapter);









    return view;

}



@Override

public void onStart() {

    super.onStart();

    adapter.startListening();

}

AllUsersClass

public class AllUsers {

public String name;

public String avatar;

public String email;

public String userId;



public AllUsers() {

}



public AllUsers(String name, String email, String avatar, String userId) {

    this.name = name;

    this.email = email;

    this.avatar = avatar;

    this.userId = userId;

}



public String getName() {

    return name;

}



public String getAvatar() {

    return avatar;

}



public String getEmail() {

    return email;

}



public void setAvatar(String avatar) {

    this.avatar = avatar;

}