如何使用flutter从firebase中检索数组数据

dependencies:
  flutter:
    sdk: flutter
  firebase_core: latest_version
  cloud_firestore: latest_version

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

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(MyApp());
}

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

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final FirebaseFirestore _firestore = FirebaseFirestore.instance;

  Future<List<String>> _getHobbies(String userId) async {
    DocumentSnapshot doc = await _firestore.collection('users').doc(userId).get();
    List<String> hobbies = List<String>.from(doc['hobbies']);
    return hobbies;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Firebase Array Data'),
      ),
      body: FutureBuilder<List<String>>(
        future: _getHobbies('user_id'), // 替换为实际的用户ID
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return Center(child: CircularProgressIndicator());
          } else if (snapshot.hasError) {
            return Center(child: Text('Error: ${snapshot.error}'));
          } else if (!snapshot.hasData || snapshot.data.isEmpty) {
            return Center(child: Text('No hobbies found.'));
          } else {
            List<String> hobbies = snapshot.data;
            return ListView.builder(
              itemCount: hobbies.length,
              itemBuilder: (context, index) {
                return ListTile(
                  title: Text(hobbies[index]),
                );
              },
            );
          }
        },
      ),
    );
  }
}