Flutter Stream Location和用户数据到firestore

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

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Firestore Demo',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Firestore Demo'),
        ),
        body: Center(
          child: RaisedButton(
            child: Text('Add User Data'),
            onPressed: () {
              addUser();
            },
          ),
        ),
      ),
    );
  }

  void addUser() {
    FirebaseFirestore.instance
        .collection('users')
        .doc('user1')
        .set({'name': 'John', 'age': 25});
  }
}