“Lesen Sie Daten in Flutter Firebase” Code-Antworten

Daten aus Firebase Flattern abrufen

  static Future<List<AustinFeedsMeEvent>> _getEventsFromFirestore() async {
CollectionReference ref = Firestore.instance.collection('events');
QuerySnapshot eventsQuery = await ref
    .where("time", isGreaterThan: new DateTime.now().millisecondsSinceEpoch)
    .where("food", isEqualTo: true)
    .getDocuments();

HashMap<String, AustinFeedsMeEvent> eventsHashMap = new HashMap<String, AustinFeedsMeEvent>();

eventsQuery.documents.forEach((document) {
  eventsHashMap.putIfAbsent(document['id'], () => new AustinFeedsMeEvent(
      name: document['name'],
      time: document['time'],
      description: document['description'],
      url: document['event_url'],
      photoUrl: _getEventPhotoUrl(document['group']),
      latLng: _getLatLng(document)));
});

return eventsHashMap.values.toList();
}
Sleepy Squirrel

Lesen Sie Daten in Flutter Firebase

import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_core/firebase_core.dart';
  
void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(MyApp());
}
  
class MyApp extends StatelessWidget {
  // This widget is the root 
  // of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Firebase',
      home: AddData(),
    );
  }
}
  
class AddData extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.green,
        title: Text("geeksforgeeks"),
      ),
      body:Center(
        child: FloatingActionButton(
          backgroundColor: Colors.green,
          child: Icon(Icons.add),
          onPressed: () {
            FirebaseFirestore.instance
                .collection('data')
                .add({'text': 'data added through app'});
          },
        ),
      ),
    );
  }
}
Aso Ndubuisi

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