Flutter (Dart)删除firebase数据库侦听器

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',
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  final CollectionReference usersRef =
      FirebaseFirestore.instance.collection('users');
  late StreamSubscription<QuerySnapshot> usersSubscription;

  @override
  void initState() {
    super.initState();
    usersSubscription = usersRef.snapshots().listen((snapshot) {
      // 处理数据更新
    });
  }

  @override
  void dispose() {
    usersSubscription.cancel(); // 删除侦听器
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Firebase Demo'),
      ),
      body: Center(
        child: Text('Hello, Firebase!'),
      ),
    );
  }
}