从 Flutter 中的 Firestore 集合中获取所有内容 [英] Get all from a Firestore collection in Flutter

问题描述

我在我的项目中设置了 Firestore.我创建了名为 categories 的新集合.在这个集合中，我创建了三个带有 uniq id 的文档.现在我想在我的 Flutter 应用程序中获取这个集合，所以我创建了 CollectionReference:

I set up Firestore in my project. I created new collection named categories. In this collection I created three documents with uniq id. Now I want to get this collection in my Flutter application so I created CollectionReference:

Firestore.instance.collection('categories')

但我不知道接下来会发生什么.

but I don't know what next.

我正在使用这个插件 firebase_firestore: 0.0.1+1

推荐答案

Using StreamBuilder

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

class ExpenseList extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new StreamBuilder<QuerySnapshot>(
        stream: Firestore.instance.collection("expenses").snapshots,
        builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
          if (!snapshot.hasData) return new Text("There is no expense");
          return new ListView(children: getExpenseItems(snapshot));
        });
  }

  getExpenseItems(AsyncSnapshot<QuerySnapshot> snapshot) {
    return snapshot.data.documents
        .map((doc) => new ListTile(title: new Text(doc["name"]), subtitle: new Text(doc["amount"].toString())))
        .toList();
  }
}

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