如何在Flutter应用程序中显示Firestore数据库中的文档

dependencies:
  flutter:
    sdk: flutter
  firebase_core: ^1.0.0
  cloud_firestore: ^2.0.0

import 'package:firebase_core/firebase_core.dart';

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

import 'package:cloud_firestore/cloud_firestore.dart';

final FirebaseFirestore firestore = FirebaseFirestore.instance;
final CollectionReference documentsRef = firestore.collection('documents');

void getDocuments() {
  documentsRef.get().then((QuerySnapshot querySnapshot) {
    querySnapshot.docs.forEach((doc) {
      print(doc.data());
    });
  });
}

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

class DocumentScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Firestore Documents'),
      ),
      body: StreamBuilder<QuerySnapshot>(
        stream: FirebaseFirestore.instance.collection('documents').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) {
              return ListTile(
                title: Text(document.data()['title']),
                subtitle: Text(document.data()['description']),
              );
            }).toList(),
          );
        },
      ),
    );
  }
}