Retrieve Data from Firebase in Flutter

Retrieving Data Using DocumentSnapshot

Retrieve Data Stored in a map in firebase

First, Add dependencies:

dependencies:
  cloud_firestore: ^1.0.7

Now, run an implicitdart pub get.
Note: Install the latest version.

Import it
Now in your Dart code, you can use:

import 'package:cloud_firestore/cloud_firestore.dart';

Now in your Dart code:

DocumentSnapshot documentSnapshot = await FirebaseFirestore.instance.collection('Collection_Name').doc('Document_Id').get();

Also, to get data length use:

int dataLength = documentSnapshot.data().length;

To get data of a single map:

List<String> dataList = documentSnapshot['key'].toString();

For queries or any other help related to flutter or dart feel free to ask in the comments😊