好的，所以我在我的应用程序中有两个模块。一个是用户，另一个是管理员。当用户注册自己时，管理员必须基本上批准用户的注册，为此，我做了一个简单的逻辑，当用户注册时，他们注册了一个额外的值userStatus = "0"，和管理员时，点击批准按钮的值更改为“1”，他们被允许登录。我正在使用一个Recycler视图来向管理模块显示数据库中的所有用户，但我想更改一个不确定如何访问的值，
下面是我的firebase数据库结构
（https://i.stack.imgur.com/LmYvR.png）complete picture of firebase database for clarity
下面是RecyclerView适配器类的代码

package com.example.adminclient;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;

import java.util.ArrayList;

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

    Context context;
    ArrayList<UserData> list;
    FirebaseDatabase fDB = FirebaseDatabase.getInstance();
    DatabaseReference reference = fDB.getReference();


    public AdapterRecycler(Context context, ArrayList<UserData> list) {
        this.context = context;
        this.list = list;
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(context).inflate(R.layout.users,parent,false);
        return new MyViewHolder(v);

    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        UserData userData = list.get(position);

        holder.firstName.setText(userData.getFirstName());
        holder.address.setText(userData.getAddress());
        holder.emailAddress.setText(userData.getEmailAddress());
        holder.userStatus.setText(userData.getUserStatus());

    }

    @Override
    public int getItemCount() {
        return list.size();
    }

    public static class MyViewHolder extends RecyclerView.ViewHolder{

        TextView firstName, address, emailAddress, userStatus;
        Button approveUser;
        FirebaseDatabase fDB = FirebaseDatabase.getInstance();
        DatabaseReference reference = fDB.getReference();

        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            firstName = itemView.findViewById(R.id.firstNametv);
            address = itemView.findViewById(R.id.addresstv);
            emailAddress = itemView.findViewById(R.id.emailtv);
            approveUser = itemView. findViewById(R.id.approve);
            userStatus = itemView.findViewById(R.id.userStatustv);
           // String firstNamedb = firstName.getText().toString();


            approveUser.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    fDB.getReference().child("Users").addListenerForSingleValueEvent(new ValueEventListener() {
                        @Override
                        public void onDataChange(@NonNull DataSnapshot snapshot) {

                                reference.child("Users").child(???).child("userStatus").setValue("1");

                        }

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

                        }
                    });

                }
            });

        }

    }
}

Here's a screenshot of Recycler View in app
下面是Recycler View类的代码

package com.example.adminclient;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;

import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;

import java.util.ArrayList;

public class VerifyUsers extends AppCompatActivity {

    RecyclerView recyclerView;
    DatabaseReference databaseReference;
    AdapterRecycler adapterRecycler;
    ArrayList<UserData> list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_verify_users);

        recyclerView = findViewById(R.id.userVerify);
        databaseReference = FirebaseDatabase.getInstance().getReference("Users");
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));


        list = new ArrayList<>();
        adapterRecycler = new AdapterRecycler(this, list);
        recyclerView.setAdapter(adapterRecycler);

        databaseReference.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot snapshot) {

                for (DataSnapshot dataSnapshot : snapshot.getChildren()){

                    UserData userData = dataSnapshot.getValue(UserData.class);
                    list.add(userData);
                }
                adapterRecycler.notifyDataSetChanged();

            }

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

            }
        });
    }
}

如果有谁了解我处境和问题，请帮助我。
我尝试了我可以在'approve'按钮onclicklistener上添加一个值事件侦听器，并从firebase数据库引用中检索孩子，但我不知道如何从这里向前迈进。

approveUser.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        fDB.getReference().child("Users").addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot snapshot) {

                    reference.child("Users").child(???).child("userStatus").setValue("1");

            }

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

            }
        });

    }
});

下面是我的UserData类

package com.example.adminclient;

import android.location.Address;

public class UserData {
    String firstName;
    String address;
    String emailAddress;

    String userStatus;



    public UserData() {
    }
    
    public String getFirstName() {

        return firstName;
    }

    public String getAddress() {

        return address;
    }

    public String getEmailAddress() {

        return emailAddress;
    }

    public String getUserStatus() {
        return userStatus;
    }
}