flutter应用程序，从firestore检索的列表复制它自己

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Firestore List Example',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Firestore List Example'),
      ),
      body: StreamBuilder<QuerySnapshot>(
        stream: Firestore.instance.collection('your_collection').snapshots(),
        builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
          if (snapshot.hasError) {
            return Text('Error: ${snapshot.error}');
          }

          if (snapshot.connectionState == ConnectionState.waiting) {
            return Text('Loading...');
          }

          List<DocumentSnapshot> documents = snapshot.data.documents;
          List<String> dataList = [];

          documents.forEach((document) {
            dataList.add(document.data['your_field']);
          });

          // 复制列表数据给自身
          List<String> copiedList = List.from(dataList);

          return ListView.builder(
            itemCount: copiedList.length,
            itemBuilder: (BuildContext context, int index) {
              return ListTile(
                title: Text(copiedList[index]),
              );
            },
          );
        },
      ),
    );
  }
}