如何从Firebase将数据添加到Listview

Question

我是Flutter的新手。

我正在尝试将Firebase数据库中的数据显示到我的应用程序中的Listview中。我在firebase数据库中有一个列表，我在其中保存了用户信息，即电子邮件和姓名，我希望我的应用程序使用listview将这些数据显示为列表，但是我一直在尝试许多教程，但无法做到。 / p>

请参见下面的屏幕快照链接

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

class FeedScreen extends StatelessWidget {
  static final String id = 'feed_screen';
  final String currentUserId;

  FeedScreen({this.currentUserId});
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  void initState() {
//    Firestore.instance.collection('mountains').document()
//        .setData({ 'title': 'Mount Baker', 'type': 'volcano' });

    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text("Home"),
      ),
      body: new BookList(),
      floatingActionButton: new FloatingActionButton(
        child: new Icon(Icons.add),
        onPressed: () {
          Firestore.instance.collection('users').document().setData(
            {
              'name': '',
              'email': '',
            },
          );
        },
      ),
    );
  }
}

class BookList extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<QuerySnapshot>(
      stream: Firestore.instance.collection('users').snapshots(),
      builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
        if (snapshot.hasError) return new Text('Error: ${snapshot.error}');
        switch (snapshot.connectionState) {
          case ConnectionState.waiting:
            return new Text('Loading...');
          default:
            return new ListView(
              children:
                  snapshot.data.documents.map((DocumentSnapshot document) {
                return new ListTile(
                  title: new Text(document['name']),
                  subtitle: new Text(document['email']),
                );
              }).toList(),
            );
        }
      },
    );
  }
}