如何从firestore flutter中读取数据

Question

我想从列表块中的 Firestore 读取数据我不想使用流构建器我想单独访问文档字段我尝试这个但不起作用

class ProductList extends StatelessWidget {


  Stream<DocumentSnapshot> snapshot =  Firestore.instance.collection("listofprods").document('ac1').snapshots();


  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(),
        body: Padding(
          padding: const EdgeInsets.all(8.0),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.start,
            children: <Widget>[
              Container(
                decoration: BoxDecoration(
                  border: Border.all(color: Colors.black)
                ),
                child: ListTile(
                      title: Text(snapshot['name']),//here error
                ),
              )
            ],

Answer 1

As Per 2021 :
 streamSnapshot.data.docs

文档 对 doc 的更改。

@override
      Widget build(BuildContext context) {
        return Scaffold(
            body: StreamBuilder(
          stream: FirebaseFirestore.instance
              .collection('chats/XYSDa16jZBO5CUMwIk0h/messages')
              .snapshots(),
          builder: (context, AsyncSnapshot<QuerySnapshot> streamSnapshot) {
            return ListView.builder(
              itemCount: streamSnapshot.data.docs.length,
              itemBuilder: (ctx, index) =>
                  Text(streamSnapshot.data.docs[index]['text']),
            );
          },
        ));

  }

Answer 2

尝试这个：

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


class WeightChart extends StatefulWidget {
  @override
  _WeightChartState createState() => _WeightChartState();
}

class _WeightChartState extends State<WeightChart>  {
  dynamic data;

  Future<dynamic> getData() async {

    final DocumentReference document =   Firestore.instance.collection("listofprods").document('ac1');

    await document.get().then<dynamic>(( DocumentSnapshot snapshot) async{
     setState(() {
       data =snapshot.data;
     });
    });
 }

 @override
  void initState() {

    super.initState();
    getData();
  }

  @override
  Widget build(BuildContext context) {

    return Scaffold(
      appBar: AppBar(
        title: const Text('Weight'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(8.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.start,
          children: <Widget>[
            Container(
              decoration: BoxDecoration(
                border: Border.all(color: Colors.black)
              ),
              child: ListTile(
                    title: Text(data['name']),//here error
              ),
            )
          ]
        )
      ),
    );
  }
}