在Flutter中懒惰地从firestore文档加载数据

dependencies:
  cloud_firestore: ^2.5.4

import 'package:cloud_firestore/cloud_firestore.dart';

class LazyLoadingPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<QuerySnapshot>(
      stream: FirebaseFirestore.instance.collection('users').snapshots(),
      builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
        if (snapshot.hasError) {
          return Text('Error: ${snapshot.error}');
        }

        if (snapshot.connectionState == ConnectionState.waiting) {
          return CircularProgressIndicator();
        }

        return ListView(
          children: snapshot.data!.docs.map((DocumentSnapshot document) {
            Map<String, dynamic> data = document.data() as Map<String, dynamic>;
            return ListTile(
              title: Text(data['name']),
              subtitle: Text(data['email']),
            );
          }).toList(),
        );
      },
    );
  }
}