Firebase 데이터베이스 Stream데이터 읽기

streambuilder를 통해서 갱신될 때 마다 값을 변경

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(
      home: MyHome(),
    );
  }
}

class MyHome extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: StreamBuilder(
        stream: FirebaseFirestore.instance.collection('chats/3pABkWJUaZEgxcQfHg7G/message').snapshots(),
        builder: (BuildContext context, AsyncSnapshot<dynamic> snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return Center(child: CircularProgressIndicator());
          } else {
            final docs = snapshot.data!.docs;
            return ListView.builder(
              itemCount: docs.length,
              itemBuilder: (context, index) {
                return Text(docs[index]['text']);
              },
            );
          }
        },
      ),
    );
  }
}