Question

现在我正在尝试将关键数据从片段传递到包含recyclerview的适配器但是问题是我无法使用捆绑软件或通过意图发送数据我很困惑如何传递数据。

这是我的片段

package com.example.together.fragment;




public class PetchingLoungeFragment extends Fragment {

    private static final String TAG = "PetFirendsFragment";

    RecyclerView recyclerView;
    PetchingLoungeAdapter petchingLoungeAdapter;
    List<User> userList;
    FirebaseUser firebaseUser;
    List<String> idList = new ArrayList<>();
    public String petKey;




    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {


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

        recyclerView = view.findViewById(R.id.recycler_view);
        recyclerView.setHasFixedSize(true);


        firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
        DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Lounge").child("PetchingBunyang").child(firebaseUser.getUid()).child("PetId");


        reference.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

                    for (DataSnapshot ds : dataSnapshot.getChildren())
                    {
                        String id = ds.getKey();

                        PetchingLoungeFragment petchingLoungeFragment = new PetchingLoungeFragment(); // Fragment 생성
                        Bundle bundle = new Bundle(1); // 파라미터는 전달할 데이터 개수
                        bundle.putString("id", id); // key , value
                        petchingLoungeFragment.setArguments(bundle);




                        DatabaseReference reference1 =
                                FirebaseDatabase.getInstance().getReference( "Lounge").child("PetchingBunyang").child(firebaseUser.getUid()).child("PetId").child(id).child("Requestor");

                        reference1.addValueEventListener(new ValueEventListener() {
                            @Override
                            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                                idList.clear();
                                for (DataSnapshot snapshot : dataSnapshot.getChildren())
                                {
                                    idList.add(snapshot.getKey());

                                }

                                showUsers();

                            }

                            @Override
                            public void onCancelled(@NonNull DatabaseError databaseError) {

                            }
                        });

                    }
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
                Log.d(TAG, "펫키에러");
            }
        });


        Log.d(TAG, "하마: "+petKey);
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext());
        recyclerView.setLayoutManager(linearLayoutManager);
        userList = new ArrayList<>();
        petchingLoungeAdapter = new PetchingLoungeAdapter(getContext(), userList);
        recyclerView.setAdapter(petchingLoungeAdapter);



        return view;

    }




    private void showUsers(){
        DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Users");
        reference.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                userList.clear();
                for (DataSnapshot snapshot : dataSnapshot.getChildren()){
                    User user = snapshot.getValue(User.class);
                    for (String id : idList){
                        if (user.getId().equals(id)){
                            userList.add(user);
                        }
                    }
                }
                Collections.reverse(userList);
                petchingLoungeAdapter.notifyDataSetChanged();
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {

            }
        });
    }




}

我想从上面发送“ id”数据

String id = ds.getKey();

这是我的适配器

package com.example.together.adapter;

public class PetchingLoungeAdapter extends RecyclerView.Adapter<PetchingLoungeAdapter.MyViewHolder> {


    private static final String TAG = "PetchingBunyangAdapter";

    FirebaseUser firebaseUser;
    DatabaseReference reference;

    Context mContext;
    List<User> mUser;

    public PetchingLoungeAdapter(Context mContext, List<User> mUser)
    {
        this.mContext = mContext;
        this.mUser = mUser;
    }



    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {



        View view = LayoutInflater.from(mContext).inflate(R.layout.list_petching_lounge, parent, false);
        return new PetchingLoungeAdapter.MyViewHolder(view);

    }

    @Override
    public void onBindViewHolder(MyViewHolder viewHolder, int position)
    {

        final User user = mUser.get(position);
        user.getId();

        Log.d(TAG, "빼오냥"+user.getId());

        getRequestorUserInfo(mUser.get(position).getId(), viewHolder.img_requestor , viewHolder.requestor_name);



        viewHolder.img_requestor.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {

                Intent intent = new Intent(v.getContext(), PetchingLoungeDetailInfoActivity.class);

                intent.putExtra("requester_name",mUser.get(position).getFullname());
                intent.putExtra("requester_img", mUser.get(position).getImageurl());
                intent.putExtra("requester_intro", mUser.get(position).getBio());
                // intent.putExtra("requester_pet_id",mUser.get(position).getUid)

                mContext.startActivity(intent);

            }
        });

    }

    @Override
    public int getItemCount()
    {
        return mUser.size();
                //mPetchingLounge.size();
    }



    public class MyViewHolder extends RecyclerView.ViewHolder
    {

        public Button allow, refuse;
        public ImageView img_requestor;
        public TextView requestor_name;

        public MyViewHolder(View itemView)
        {
            super(itemView);

            img_requestor = itemView.findViewById(R.id.img_requestor);

            allow = itemView.findViewById(R.id.allow);
            refuse = itemView.findViewById(R.id.refuse);

            requestor_name = itemView.findViewById(R.id.requestor_name);

        }
    }



    // 펫 정보 이름, 나이, 견종, 성별,
    private void getRequestorUserInfo(String userid, final ImageView img_requestor, final TextView requestor_name)
    {

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

        DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Users").child(userid);

        reference.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                User user = dataSnapshot.getValue(User.class);

                Glide.with(mContext).load(user.getImageurl()).into(img_requestor);

                requestor_name.setText(user.getUsername());
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {

            }
        });

    }



}

我已经尝试使用Bundle，但是它无法使用... 我该如何发送这些数据？

Answer 1

在适配器类中创建一个公共函数和一个私有变量

Int id;

public void setId(int id) {
    this.id = id;
}

现在通过片段设置ID

    petchingLoungeAdapter = new PetchingLoungeAdapter(getContext(), userList);
    petchingLoungeAdapter.setId(/* set ID here */) ;
    recyclerView.setAdapter(petchingLoungeAdapter);

Answer 2

您可以像这样编写适配器类的构造函数

       Context mContext;
        List<User> mUser;
          String id;

        public PetchingLoungeAdapter(Context mContext, List<User> mUser, String id)
        {
            this.mContext = mContext;
            this.mUser = mUser;
             this.id=id;
        }

您可以按照以下步骤从片段中调用此构造函数

petchingLoungeAdapter = new PetchingLoungeAdapter(getContext(), userList,id);// pass the id here ( ds.getKey() ).
        recyclerView.setAdapter(petchingLoungeAdapter);

我如何将数据从片段传递到适配器

2 个答案: