TYPESCRIPT

read firebase data from flutter

FirebaseFirestore.instance
    .collection('users')
    .doc(userId)
    .get()
    .then((DocumentSnapshot documentSnapshot) {
      if (documentSnapshot.exists) {
        print('Document exists on the database');
        Map<String, dynamic> data = 
        	documentSnapshot.data() as Map<String, dynamic>;

      }
});

retrieve data from firebase flutter

  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();
}

retrieve data from firebase realtime database flutter

Open the pubspec. ...
Add your Flutter application to Firebase by clicking on the Android icon.
Add your application's package name as shown in the image below.
You can find your package name in the app-level – build. ...
Download the google-services. ...
Paste classpath 'com.

retrieve data from firebase realtime database flutter

Open the pubspec. ...
Add your Flutter application to Firebase by clicking on the Android icon.
Add your application's package name as shown in the image below.
You can find your package name in the app-level – build. ...
Download the google-services. ...
Paste classpath 'com.