如何比较两个列表并返回另一个值相同的列表​？- Flutter和Firebase

import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

Future<List<dynamic>> compareLists() async {
  // 初始化Firebase
  await Firebase.initializeApp();

  // 获取Firebase Firestore实例
  FirebaseFirestore firestore = FirebaseFirestore.instance;

  // 获取第一个列表数据
  QuerySnapshot querySnapshot1 = await firestore.collection('collection1').get();
  List<dynamic> list1 = querySnapshot1.docs.map((doc) => doc.data()).toList();

  // 获取第二个列表数据
  QuerySnapshot querySnapshot2 = await firestore.collection('collection2').get();
  List<dynamic> list2 = querySnapshot2.docs.map((doc) => doc.data()).toList();

  // 创建空列表
  List<dynamic> resultList = [];

  // 比较两个列表并返回相同值的列表
  for (var item1 in list1) {
    for (var item2 in list2) {
      if (item1 == item2) {
        resultList.add(item1);
        break;
      }
    }
  }

  return resultList;
}

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Compare Lists',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: Text('Compare Lists'),
        ),
        body: Center(
          child: ElevatedButton(
            child: Text('Compare'),
            onPressed: () async {
              List<dynamic> result = await compareLists();
              print(result);
            },
          ),
        ),
      ),
    );
  }
}