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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:async';
import 'dart:convert' show json;
import "package:http/http.dart" as http;
import 'package:flutter/material.dart';
import 'package:google_sign_in/google_sign_in.dart';
GoogleSignIn _googleSignIn = GoogleSignIn(
scopes: <String>[
'email',
'https://www.googleapis.com/auth/contacts.readonly',
],
);
void main() {
runApp(
MaterialApp(
title: 'Google Sign In',
home: SignInDemo(),
),
);
}
class SignInDemo extends StatefulWidget {
@override
State createState() => SignInDemoState();
}
class SignInDemoState extends State<SignInDemo> {
GoogleSignInAccount _currentUser;
String _contactText;
@override
void initState() {
super.initState();
_googleSignIn.onCurrentUserChanged.listen((GoogleSignInAccount account) {
setState(() {
_currentUser = account;
});
if (_currentUser != null) {
_handleGetContact();
}
});
_googleSignIn.signInSilently();
}
Future<void> _handleGetContact() async {
setState(() {
_contactText = "Loading contact info...";
});
final http.Response response = await http.get(
'https://people.googleapis.com/v1/people/me/connections'
'?requestMask.includeField=person.names',
headers: await _currentUser.authHeaders,
);
if (response.statusCode != 200) {
setState(() {
_contactText = "People API gave a ${response.statusCode} "
"response. Check logs for details.";
});
print('People API ${response.statusCode} response: ${response.body}');
return;
}
final Map<String, dynamic> data = json.decode(response.body);
final String namedContact = _pickFirstNamedContact(data);
setState(() {
if (namedContact != null) {
_contactText = "I see you know $namedContact!";
} else {
_contactText = "No contacts to display.";
}
});
}
String _pickFirstNamedContact(Map<String, dynamic> data) {
final List<dynamic> connections = data['connections'];
final Map<String, dynamic> contact = connections?.firstWhere(
(dynamic contact) => contact['names'] != null,
orElse: () => null,
);
if (contact != null) {
final Map<String, dynamic> name = contact['names'].firstWhere(
(dynamic name) => name['displayName'] != null,
orElse: () => null,
);
if (name != null) {
return name['displayName'];
}
}
return null;
}
Future<void> _handleSignIn() async {
try {
await _googleSignIn.signIn();
} catch (error) {
print(error);
}
}
Future<void> _handleSignOut() async {
_googleSignIn.disconnect();
}
Widget _buildBody() {
if (_currentUser != null) {
return Column(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: <Widget>[
ListTile(
leading: GoogleUserCircleAvatar(
identity: _currentUser,
),
title: Text(_currentUser.displayName),
subtitle: Text(_currentUser.email),
),
const Text("Signed in successfully."),
Text(_contactText),
RaisedButton(
child: const Text('SIGN OUT'),
onPressed: _handleSignOut,
),
RaisedButton(
child: const Text('REFRESH'),
onPressed: _handleGetContact,
),
],
);
} else {
return Column(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: <Widget>[
const Text("You are not currently signed in."),
RaisedButton(
child: const Text('SIGN IN'),
onPressed: _handleSignIn,
),
],
);
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Google Sign In'),
),
body: ConstrainedBox(
constraints: const BoxConstraints.expand(),
child: _buildBody(),
));
}
}