LoginApp Diosaban

LoginApp-Diosaban/main.dart

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+import 'package:login_app/models/user.dart';
+import 'package:login_app/screens/wrapper.dart';
+import 'package:login_app/services/auth.dart';
+import 'package:flutter/material.dart';
+import 'package:firebase_core/firebase_core.dart';
+import 'package:provider/provider.dart';
+import 'package:login_app/screens/about_screen.dart';
+import 'package:login_app/screens/home_screen.dart';
+
+Future<void> main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+  await Firebase.initializeApp();
+  runApp(MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return StreamProvider<User>.value(
+      value:AuthService().user,
+      child: MaterialApp(
+          home: Wrapper()
+      ),
+    );
+  }
+}

LoginApp-Diosaban/models/user.dart

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+class User {
+  final String uid;
+
+  User({this.uid});
+}

LoginApp-Diosaban/screens/about_screen.dart

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+import 'package:firebase_auth/firebase_auth.dart';
+import 'package:flutter/material.dart';
+import 'package:login_app/screens/home_screen.dart';
+
+class AboutScreen extends StatefulWidget {
+  @override
+  _AboutScreenState createState() => _AboutScreenState();
+}
+class _AboutScreenState extends State<AboutScreen> {
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      color: Colors.white,
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          Text("About this app: I have no idea what to put in this app", style: TextStyle(fontSize: 18),),
+          FloatingActionButton(onPressed: () {
+            Navigator.pop(context);
+          },
+            child: Text("Go Back"),)
+        ],
+      ),
+    );
+  }
+}

LoginApp-Diosaban/screens/home_screen.dart

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+import 'package:firebase_auth/firebase_auth.dart';
+import 'package:flutter/material.dart';
+import 'package:login_app/screens/about_screen.dart';
+class HomeScreen extends StatefulWidget {
+  @override
+  _HomeScreenState createState() => _HomeScreenState();
+}
+
+class _HomeScreenState extends State<HomeScreen> {
+  @override
+  Future navigateToSubPage(context) async {
+    Navigator.push(
+        context, MaterialPageRoute(builder: (context) => AboutScreen()));
+  }
+
+@override
+Widget build(BuildContext context) {
+  return Scaffold(
+      appBar: AppBar(
+        title: Text("Home Screen"),
+      ),
+      body: Container(
+          decoration: BoxDecoration(
+            image: DecorationImage(
+              image: AssetImage("assets/Home.png"),
+              fit: BoxFit.cover,
+            ),
+          ),
+          child: Center(
+            child: Column(
+              mainAxisAlignment: MainAxisAlignment.center,
+              children: [
+                Text(
+                  "Welcome to the department.",
+                  style: TextStyle(color: Colors.white, fontSize: 18),
+                ),
+                RaisedButton(
+                  color: Colors.blue,
+                  onPressed: () {
+                    navigateToSubPage(context);
+                  },
+                  child: Text("About Us"),
+                ),
+                RaisedButton(
+                  color: Colors.red,
+                  onPressed: () {
+                    FirebaseAuth.instance.signOut();
+                  },
+                  child: Text("Sign out"),
+                ),
+              ],
+            ),
+          )));
+}
+}
+
+

LoginApp-Diosaban/screens/signin_screen.dart

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+import 'package:login_app/services/auth.dart';
+import 'package:flutter/material.dart';
+
+class SignInScreen extends StatefulWidget {
+  @override
+  _SignInScreenState createState() => _SignInScreenState();
+}
+
+class _SignInScreenState extends State<SignInScreen> {
+  final AuthService _auth = AuthService();
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          FloatingActionButton(
+            onPressed: () async {
+              dynamic result = await _auth.signInAnon();
+              if(result == null) {
+                print("Error Signing in");
+              } else {
+                print("Signed in");
+              }
+            },
+            child: Text("Signin"),
+          )
+        ],
+      ),
+    );
+  }
+}

LoginApp-Diosaban/screens/wrapper.dart

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+import 'package:login_app/models/user.dart';
+import 'package:login_app/screens/home_screen.dart';
+import 'package:login_app/screens/signin_screen.dart';
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+class Wrapper extends StatefulWidget {
+  @override
+  _WrapperState createState() => _WrapperState();
+}
+
+class _WrapperState extends State<Wrapper> {
+  @override
+  Widget build(BuildContext context) {
+    final user = Provider.of<User>(context);
+    //TODO if no user data signin, home_screen otherwise
+    if(user == null) {
+      return SignInScreen();
+    } else {
+      return HomeScreen();
+    }
+  }
+}
+

LoginApp-Diosaban/services/auth.dart

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+import 'package:login_app/models/user.dart';
+import 'package:firebase_auth/firebase_auth.dart' as fire;
+
+class AuthService {
+  final fire.FirebaseAuth _auth = fire.FirebaseAuth.instance;
+
+  User _getUserFromFirebaseUser(fire.User user) {
+    return user != null ? User(uid: user.uid) : null;
+  }
+
+  Stream<User> get user {
+    return _auth.authStateChanges().map(_getUserFromFirebaseUser);
+  }
+
+  Future signInAnon() async {
+    try {
+      fire.UserCredential result = await _auth.signInAnonymously();
+      fire.User user = result.user;
+      return _getUserFromFirebaseUser(user);
+    } catch (e)
+    {
+      print(e.toString());
+    }
+  }
+
+  Future signOut() async {
+    try {
+      return await _auth.signOut();
+    } catch (e) {
+      print(e.toString());
+      return null;
+    }
+  }
+}