The login screen now redirects to the home screen if a user successfully logs in

lib/src/resources/authService.dart

@@ -22,9 +22,12 @@ class AuthService {
     _googleSignInProvider.onAuthStateChange.pipe(_user);
   }
 
-  Future<void> googleLoginAndSignup() async {
+  Future<FirebaseUser> googleLoginAndSignup() async {
     final user = await _googleSignInProvider.signIn();
 
+    if (user == null) {
+      return null;
+    }
     // Create a new user in Firestore if this is the first time signing in.
     if (!await _firestoreProvider.userExists(user.email)) {
       final newUserModel = UserModel(
@@ -37,6 +40,8 @@ class AuthService {
       );
       await _firestoreProvider.createUser(newUserModel, user.uid);
     }
+
+    return user;
   }
 
   Future<void> signOut() {

lib/src/screens/home_screen.dart

@@ -1,12 +1,24 @@
 import 'package:flutter/material.dart';
 
+import '../resources/authService.dart';
+
 class HomeScreen extends StatelessWidget {
+  final _auth = authService;
+
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
         title: Text('Main Screen'),
       ),
-      body: Text('Tasks go here'),
+      body: MaterialButton(
+        onPressed: () => _auth.signOut(),
+        child: Text(
+          'SignOut',
+          style: TextStyle(
+            color: Colors.white,
+          ),
+        ),
+      ),
     );
   }
 }

lib/src/screens/login_screen.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:font_awesome_flutter/font_awesome_flutter.dart';
 
@@ -6,7 +8,7 @@ import '../widgets/logo.dart';
 import '../widgets/gradient_button.dart';
 
 class LoginScreen extends StatelessWidget {
-  final AuthService _authService = authService;
+  final _authService = authService;
 
   Widget build(BuildContext context) {
     return Scaffold(
@@ -23,7 +25,7 @@ class LoginScreen extends StatelessWidget {
             Expanded(
               child: Center(
                 child: GradientButton(
-                  onTap: () => _authService.googleLoginAndSignup(),
+                  onTap: () => onLoginButtonTap(context),
                   height: 50,
                   width: 310,
                   radius: 25,
@@ -38,6 +40,13 @@ class LoginScreen extends StatelessWidget {
     );
   }
 
+  Future<void> onLoginButtonTap(BuildContext context) async {
+    final user = await _authService.googleLoginAndSignup();
+    if (user != null) {
+      Navigator.of(context).pushNamed('home/');
+    }
+  }
+
   Widget getButtonBody() {
     return Row(
       mainAxisSize: MainAxisSize.min,