使用Flutter从Firestore读取数据

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 Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Firestore Demo'),
      ),
      body: StreamBuilder(
        stream: FirebaseFirestore.instance.collection('users').snapshots(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return CircularProgressIndicator();
          }
          return ListView.builder(
            itemCount: snapshot.data.docs.length,
            itemBuilder: (context, index) {
              DocumentSnapshot document = snapshot.data.docs[index];
              Map<String, dynamic> data = document.data();
              return ListTile(
                title: Text(data['name']),
                subtitle: Text(data['email']),
              );
            },
          );
        },
      ),
    );
  }
}