如何在 android studio 的主活动中从菜单 xml 启动 TextView 项目

Question

我试图让用户电子邮件是该菜单的文本视图显示在主活动的菜单上，但我不知道如何在主活动 java 文件中实例化它

package com.example.mymycology;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.TextView;

import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

public class MainActivity extends AppCompatActivity {
FirebaseAuth auth;
TextView textView;
FirebaseUser user;



    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.logout_menu, menu);
        return true;
    }



    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.Logout:
                FirebaseAuth.getInstance().signOut();
                Intent intent  = new Intent(getApplicationContext(), Login.class);
                startActivity(intent);
                finish();

        }

        return super.onOptionsItemSelected(item);
    }


    @Override
    protected void onCreate(Bundle savedInstanceState ) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        auth = FirebaseAuth.getInstance();
        user = auth.getCurrentUser();
        textView = findViewById(R.id.user_details);
        
        if (user == null) {
            Intent intent  = new Intent(getApplicationContext(), Login.class);
            startActivity(intent);
            finish();
        }else{
            textView.setText(user.getEmail());
        }

        }
    }

用户详细信息是菜单中该文本的 ID 错误是我尝试将 textview 设置为该 id