reddit_tutorial

A new Flutter project. https://github.com/RivaanRanawat/flutter-reddit-clone

Getting Started

This project is a starting point for a Flutter application.

A few resources to get you started if this is your first Flutter project:

For help getting started with Flutter development, view the online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.

Login Screen UI

login_screen.dart

import 'package:flutter/material.dart';
import 'package:reddit_tutorial/core/common/sign_in_button.dart';

import '../../../core/constants/constants.dart';

class LoginScreen extends StatelessWidget {
  const LoginScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Image.asset(
          Constants.logoPath,
          height: 40,
        ),
        actions: [TextButton(onPressed: () {}, child: const Text('Skip'))],
      ),
      body: Column(
        children: [
          const SizedBox(height: 30),
          const Text(
            'Dive into anything',
            style: TextStyle(
                fontSize: 24, fontWeight: FontWeight.bold, letterSpacing: 0.5),
          ),
          const SizedBox(height: 30),
          Padding(
            padding: const EdgeInsets.all(8.0),
            child: Image.asset(
              Constants.logoEmotePath,
              height: 300,
            ),
          ),
          const SizedBox(height: 30),
          const SignInButton(),
        ],
      ),
    );
  }
}

sign_in_button.dart

import 'package:flutter/material.dart';
import 'package:reddit_tutorial/core/constants/constants.dart';
import 'package:reddit_tutorial/theme/pallete.dart';

class SignInButton extends StatelessWidget {
  const SignInButton({super.key});

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(18.0),
      child: ElevatedButton.icon(
          onPressed: () {},
          icon: Image.asset(
            Constants.googlePath,
            width: 35,
          ),
          label: const Text(
            'Continue with Google',
            style: TextStyle(fontSize: 18),
          ),
          style: ElevatedButton.styleFrom(
            backgroundColor: Pallete.greyColor,
            minimumSize: const Size(double.infinity, 50),
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(20),
            ),
          )),
    );
  }
}

Firebase Setup

pubspec.yaml

firebase_core: ^2.9.0
  firebase_storage: ^11.1.0
  cloud_firestore: ^4.5.0
  firebase_auth: ^4.4.0
  google_sign_in: ^6.1.0
  flutter_riverpod: ^2.3.4

android/app/google-services.json

{
  "project_info": {        // START: FlutterFire Configuration
        classpath 'com.google.gms:google-services:4.3.10'
        // END: FlutterFire Configuration

android/build.gradle

        // START: FlutterFire Configuration
        classpath 'com.google.gms:google-services:4.3.10'
        // END: FlutterFire Configuration

lib/main.dart

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  );
  runApp(const MyApp());
}

macos/Flutter/GeneratedPluginRegistrant.swift

func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
  FLTFirebaseFirestorePlugin.register(with: registry.registrar(forPlugin: "FLTFirebaseFirestorePlugin"))
  FLTFirebaseAuthPlugin.register(with: registry.registrar(forPlugin: "FLTFirebaseAuthPlugin"))
  FLTFirebaseCorePlugin.register(with: registry.registrar(forPlugin: "FLTFirebaseCorePlugin"))
  FLTFirebaseStoragePlugin.register(with: registry.registrar(forPlugin: "FLTFirebaseStoragePlugin"))
}

pod install

Google Sign In Firebase Authentication

lib/main.dart

await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  );
  runApp(const ProviderScope(child: MyApp()));
}

lib/features/auth/repository/auth_repository.dart

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:google_sign_in/google_sign_in.dart';
import 'package:reddit_tutorial/core/providers/firebase_providers.dart';

final authRepositoryProvider = Provider((ref) => AuthRepository(
    firestore: ref.read(firestoreProvider),
    auth: ref.read(authProvider),
    googleSignIn: ref.read(googleSignInProvider)));

class AuthRepository {
  final FirebaseFirestore _firebase;
  final FirebaseAuth _auth;
  final GoogleSignIn _googleSignIn;

  AuthRepository({
    required FirebaseFirestore firestore,
    required FirebaseAuth auth,
    required GoogleSignIn googleSignIn,
  })  : _auth = auth,
        _firebase = firestore,
        _googleSignIn = googleSignIn;

  void signInWithGoogle() async {
    try {
      final GoogleSignInAccount? googleUser = await _googleSignIn.signIn();

      final googleAuth = await googleUser?.authentication;

      final credential = GoogleAuthProvider.credential(
        accessToken: googleAuth?.accessToken,
        idToken: googleAuth?.idToken,
      );

      UserCredential userCredential =
          await _auth.signInWithCredential(credential);

      print(userCredential.user?.email);
    } catch (e) {
      print(e);
    }
  }
}

lib/features/auth/controller/auth_controller.dart

import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../repository/auth_repository.dart';

final authControllerProvider = Provider((ref) => AuthController(authRepository: ref.read(authRepositoryProvider)));

class AuthController {
  final AuthRepository _authRepository;
  AuthController({required AuthRepository authRepository})
      : _authRepository = authRepository;

  void signInWithGoogle() {
    _authRepository.signInWithGoogle();
  }
}

lib/core/providers/firebase_providers.dart

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:firebase_storage/firebase_storage.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:google_sign_in/google_sign_in.dart';

final firestoreProvider = Provider((ref) => FirebaseFirestore.instance);
final authProvider = Provider((ref) => FirebaseAuth.instance);
final storageProvider = Provider((ref) => FirebaseStorage.instance);
final googleSignInProvider = Provider((ref) => GoogleSignIn());

lib/core/common/sign_in_button.dart

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:reddit_tutorial/core/constants/constants.dart';
import 'package:reddit_tutorial/features/auth/controller/auth_controller.dart';
import 'package:reddit_tutorial/theme/pallete.dart';

class SignInButton extends ConsumerWidget {
  const SignInButton({super.key});

  void signInWithGoogle(WidgetRef ref) {
    ref.read(authControllerProvider).signInWithGoogle();
  }

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    return Padding(
      padding: const EdgeInsets.all(18.0),
      child: ElevatedButton.icon(
          onPressed: () => signInWithGoogle(ref),
          icon: Image.asset(
            Constants.googlePath,
            width: 35,
          ),
          label: const Text(
            'Continue with Google',
            style: TextStyle(fontSize: 18),
          ),
          style: ElevatedButton.styleFrom(
            backgroundColor: Pallete.greyColor,
            minimumSize: const Size(double.infinity, 50),
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(20),
            ),
          )),
    );
  }
}

Storing Data to Firestore

firebase_constants.dart

class FirebaseConstants {
  static const usersCollection = 'users';
  static const communitiesCollection = 'communities';
  static const postsCollection = 'posts';
  static const commentsCollection = 'comments';
}

constants.dart

  static const bannerDefault =
      'https://thumbs.dreamstime.com/b/abstract-stained-pattern-rectangle-background-blue-sky-over-fiery-red-orange-color-modern-painting-art-watercolor-effe-texture-123047399.jpg';
  static const avatarDefault =
      'https://external-preview.redd.it/5kh5OreeLd85QsqYO1Xz_4XSLYwZntfjqou-8fyBFoE.png?auto=webp&s=dbdabd04c399ce9c761ff899f5d38656d1de87c2';
}

user_model.dart

import 'package:flutter/foundation.dart';

class UserModel {
  final String name;
  final String profilePic;
  final String banner;
  final String uid;
  final bool isAuthenticated; // if guest or not
  final int karma;
  final List<String> awards;
  UserModel({
    required this.name,
    required this.profilePic,
    required this.banner,
    required this.uid,
    required this.isAuthenticated,
    required this.karma,
    required this.awards,
  });

  UserModel copyWith({
    String? name,
    String? profilePic,
    String? banner,
    String? uid,
    bool? isAuthenticated,
    int? karma,
    List<String>? awards,
  }) {
    return UserModel(
      name: name ?? this.name,
      profilePic: profilePic ?? this.profilePic,
      banner: banner ?? this.banner,
      uid: uid ?? this.uid,
      isAuthenticated: isAuthenticated ?? this.isAuthenticated,
      karma: karma ?? this.karma,
      awards: awards ?? this.awards,
    );
  }

  Map<String, dynamic> toMap() {
    return <String, dynamic>{
      'name': name,
      'profilePic': profilePic,
      'banner': banner,
      'uid': uid,
      'isAuthenticated': isAuthenticated,
      'karma': karma,
      'awards': awards,
    };
  }

  factory UserModel.fromMap(Map<String, dynamic> map) {
    return UserModel(
        name: map['name'] as String,
        profilePic: map['profilePic'] as String,
        banner: map['banner'] as String,
        uid: map['uid'] as String,
        isAuthenticated: map['isAuthenticated'] as bool,
        karma: map['karma'] as int,
        awards: List<String>.from(
          (map['awards'] as List<String>),
        ));
  }

  @override
  String toString() {
    return 'UserModel(name: $name, profilePic: $profilePic, banner: $banner, uid: $uid, isAuthenticated: $isAuthenticated, karma: $karma, awards: $awards)';
  }

  @override
  bool operator ==(covariant UserModel other) {
    if (identical(this, other)) return true;

    return other.name == name &&
        other.profilePic == profilePic &&
        other.banner == banner &&
        other.uid == uid &&
        other.isAuthenticated == isAuthenticated &&
        other.karma == karma &&
        listEquals(other.awards, awards);
  }

  @override
  int get hashCode {
    return name.hashCode ^
        profilePic.hashCode ^
        banner.hashCode ^
        uid.hashCode ^
        isAuthenticated.hashCode ^
        karma.hashCode ^
        awards.hashCode;
  }
}

auth_repository.dart

final authRepositoryProvider = Provider((ref) => AuthRepository(
    firestore: ref.read(firestoreProvider),
    auth: ref.read(authProvider),
    googleSignIn: ref.read(googleSignInProvider)));

class AuthRepository {
  final FirebaseFirestore _firebase;
  final FirebaseAuth _auth;
  final GoogleSignIn _googleSignIn;

  AuthRepository({
    required FirebaseFirestore firestore,
    required FirebaseAuth auth,
    required GoogleSignIn googleSignIn,
  })  : _auth = auth,
        _firebase = firestore,
        _googleSignIn = googleSignIn;

        CollectionReference get _user => _firebase.collection(FirebaseConstants.usersCollection);

  void signInWithGoogle() async {
    try {
      final GoogleSignInAccount? googleUser = await _googleSignIn.signIn();

      final googleAuth = await googleUser?.authentication;

      final credential = GoogleAuthProvider.credential(
        accessToken: googleAuth?.accessToken,
        idToken: googleAuth?.idToken,
      );

      UserCredential userCredential =
          await _auth.signInWithCredential(credential);

      UserModel userModel = UserModel(
          name: userCredential.user!.displayName ?? 'No Name',
          profilePic: userCredential.user!.photoURL ?? Constants.avatarDefault,
          banner: Constants.bannerDefault,
          uid: userCredential.user!.uid,
          isAuthenticated: true,
          karma: 0,
          awards: []);

      await _user.doc(userCredential.user!.uid).set(userModel.toMap());
    } catch (e) {
      print(e);
    }
  }
}

Efficient Exception Handling Technique

pubspec.yaml

  fpdart: ^0.5.0

lib/core/failure.dart

class Failure {
  final String message;
  Failure(this.message);
}

lib/core/type_defs.dart

import 'package:fpdart/fpdart.dart';

import 'failure.dart';

typedef FutureEither<T> = Future<Either<Failure, T>>;
typedef FutureVoid = FutureEither<void>;

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

void showSnackBar(BuildContext context, String text) {
  ScaffoldMessenger.of(context)
    ..hideCurrentSnackBar()
    ..showSnackBar(
      SnackBar(
        content: Text(text),
      ),
    );
}

lib/core/utils.dart

import 'package:flutter/material.dart';

void showSnackBar(BuildContext context, String text) {
  ScaffoldMessenger.of(context)
    ..hideCurrentSnackBar()
    ..showSnackBar(
      SnackBar(
        content: Text(text),
      ),
    );
}

lib/features/auth/controller/auth_controller.dart

final authControllerProvider = Provider(
    (ref) => AuthController(authRepository: ref.read(authRepositoryProvider)));

  void signInWithGoogle(BuildContext context) async {
    final user = await _authRepository.signInWithGoogle();
    user.fold((l) => showSnackBar(context, l.message), (r) => null);
  }

lib/features/auth/repository/auth_repository.dart

final authRepositoryProvider = Provider((ref) => AuthRepository(
    firestore: ref.read(firestoreProvider),
    auth: ref.read(authProvider),
    googleSignIn: ref.read(googleSignInProvider)));

class AuthRepository {
  final FirebaseFirestore _firebase;
  final FirebaseAuth _auth;
  final GoogleSignIn _googleSignIn;

  AuthRepository({
    required FirebaseFirestore firestore,
    required FirebaseAuth auth,
    required GoogleSignIn googleSignIn,
  })  : _auth = auth,
        _firebase = firestore,
        _googleSignIn = googleSignIn;

  CollectionReference get _users =>
      _firebase.collection(FirebaseConstants.usersCollection);

  FutureEither<UserModel> signInWithGoogle() async {
    try {
      final GoogleSignInAccount? googleUser = await _googleSignIn.signIn();

      final googleAuth = await googleUser?.authentication;

      final credential = GoogleAuthProvider.credential(
        accessToken: googleAuth?.accessToken,
        idToken: googleAuth?.idToken,
      );

      UserCredential userCredential =
          await _auth.signInWithCredential(credential);

      UserModel userModel;

      if (userCredential.additionalUserInfo!.isNewUser) {
        userModel = UserModel(
            name: userCredential.user!.displayName ?? 'No Name',
            profilePic:
                userCredential.user!.photoURL ?? Constants.avatarDefault,
            banner: Constants.bannerDefault,
            uid: userCredential.user!.uid,
            isAuthenticated: true,
            karma: 0,
            awards: []);
        await _users.doc(userCredential.user!.uid).set(userModel.toMap());
      } else {
        userModel = await getUserData(userCredential.user!.uid).first;
      }
      return right(userModel);
    } on FirebaseException catch (e) {
      throw e.message!;
    } catch (e) {
      return left(Failure(e.toString()));
    }
  }

Storing Data to Provider

lib/core/common/loader.dart

import 'package:flutter/material.dart';

class Loader extends StatelessWidget {
  const Loader({super.key});

  @override
  Widget build(BuildContext context) {
    return const Center(
      child: CircularProgressIndicator(),
    );
  }
}

lib/core/common/sign_in_button.dart

  void signInWithGoogle(BuildContext context, WidgetRef ref) {
    ref.read(authControllerProvider.notifier).signInWithGoogle(context);
  }

lib/features/auth/controller/auth_controller.dart

final userProvider = StateProvider<UserModel?>((ref) => null);

final authControllerProvider = StateNotifierProvider<AuthController, bool>(
    (ref) => AuthController(
        authRepository: ref.watch(authRepositoryProvider), ref: ref));

class AuthController extends StateNotifier<bool> {
  final AuthRepository _authRepository;
  final Ref _ref;
  AuthController({required AuthRepository authRepository, required Ref ref})
      : _authRepository = authRepository,
        _ref = ref,
        super(false); //loading

  void signInWithGoogle(BuildContext context) async {
    state = true;
    final user = await _authRepository.signInWithGoogle();
    state = false;
    user.fold(
      (l) => showSnackBar(context, l.message),
      (userModel) =>
          _ref.read(userProvider.notifier).update((state) => userModel),
    );
  }
}

lib/features/auth/screens/login_screen.dart

class LoginScreen extends ConsumerWidget {
  const LoginScreen({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final isLoading = ref.watch(authControllerProvider);
    return Scaffold(
      appBar: AppBar(
        title: Image.asset(
          Constants.logoPath,

Route Management

pubspec.yaml

  routemaster: ^1.0.1

lib/router.dart

import 'package:flutter/material.dart';
import 'package:reddit_tutorial/features/auth/screens/login_screen.dart';
import 'package:routemaster/routemaster.dart';

final loggedOutRoute = RouteMap(routes: {
  '/': (_) => const MaterialPage(child: LoginScreen())
});

lib/main.dart

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  );
  runApp(const ProviderScope(child: MyApp()));
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp.router(
      debugShowCheckedModeBanner: false,
      title: 'Reddit Tutorial',
      theme: Pallete.darkModeAppTheme,
      routerDelegate: RoutemasterDelegate(routesBuilder: (context) => loggedOutRoute),
      routeInformationParser: const RoutemasterParser(),
    );
  }
}

Firebase State Persistence

lib/core/common/error_text.dart

import 'package:flutter/material.dart';

class ErrorText extends StatelessWidget {
  final String error;
  const ErrorText({super.key, required this.error});

  @override
  Widget build(BuildContext context) {
    return Center(child: Text(error),);
  }
}

lib/features/auth/controller/auth_controller.dart

final userProvider = StateProvider<UserModel?>((ref) => null);

final authControllerProvider = StateNotifierProvider<AuthController, bool>(
    (ref) => AuthController(
        authRepository: ref.watch(authRepositoryProvider), ref: ref));

final authStateChangeProvider = StreamProvider((ref) {
  final authController = ref.watch(authControllerProvider.notifier);
  return authController.authStateChange;
});

final getUserDataProvider = StreamProvider.family((ref, String uid) {
  final authController = ref.watch(authControllerProvider.notifier);
  return authController.getUserData(uid);
});

class AuthController extends StateNotifier<bool> {
  final AuthRepository _authRepository;
  final Ref _ref;
  AuthController({required AuthRepository authRepository, required Ref ref})
      : _authRepository = authRepository,
        _ref = ref,
        super(false); //loading

  Stream<User?> get authStateChange => _authRepository.authStateChange;

  void signInWithGoogle(BuildContext context) async {
    state = true;
    final user = await _authRepository.signInWithGoogle();
    state = false;
    user.fold(
      (l) => showSnackBar(context, l.message),
      (userModel) =>
          _ref.read(userProvider.notifier).update((state) => userModel),
    );
  }

  Stream<UserModel> getUserData(String uid) {
    return _authRepository.getUserData(uid);
  }
}

lib/features/auth/repository/auth_repository.dart

  Stream<User?> get authStateChange => _auth.authStateChanges();

lib/features/home/screen/home_screen.dart

class HomeScreen extends ConsumerWidget {
  const HomeScreen({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final user = ref.watch(userProvider)!;

    return Scaffold(
      body: Center(child: Text(user.name)),
    );
  }
}

lib/main.dart

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  );
  runApp(const ProviderScope(child: MyApp()));
}

class MyApp extends ConsumerStatefulWidget {
  const MyApp({super.key});

  @override
  ConsumerState<ConsumerStatefulWidget> createState() => _MyAppState();
}

class _MyAppState extends ConsumerState<MyApp> {
  UserModel? userModel;

  void getData(WidgetRef ref, User data) async {
    userModel = await ref
        .watch(authControllerProvider.notifier)
        .getUserData(data.uid)
        .first;
    ref.read(userProvider.notifier).update((state) => userModel);
    setState(() {});
  }

  @override
  Widget build(BuildContext context) {
    return ref.watch(authStateChangeProvider).when(
          data: (data) => MaterialApp.router(
            debugShowCheckedModeBanner: false,
            title: 'Reddit Tutorial',
            theme: Pallete.darkModeAppTheme,
            routerDelegate: RoutemasterDelegate(routesBuilder: (context) {
              if (data != null) {
                getData(ref, data);
                if (userModel != null) {
                  return loggedInRoute;
                }
              }
              return loggedOutRoute;
            }),
            routeInformationParser: const RoutemasterParser(),
          ),
          error: (error, stackTrace) => ErrorText(error: error.toString()),
          loading: () => const Loader(),
        );
  }
}

lib/router.dart

final loggedInRoute = RouteMap(routes: {
  '/': (_) => const MaterialPage(child: HomeScreen()),
});

Name		Name	Last commit message	Last commit date
Latest commit History 24 Commits
android		android
assets/images		assets/images
ios		ios
lib		lib
linux		linux
macos		macos
test		test
web		web
windows		windows
.gitignore		.gitignore
.metadata		.metadata
README.md		README.md
analysis_options.yaml		analysis_options.yaml
pubspec.lock		pubspec.lock
pubspec.yaml		pubspec.yaml

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reddit_tutorial

Getting Started

Login Screen UI

Firebase Setup

Google Sign In Firebase Authentication

Storing Data to Firestore

Efficient Exception Handling Technique

Storing Data to Provider

Route Management

Firebase State Persistence

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reddit_tutorial

Getting Started

Login Screen UI

Firebase Setup

Google Sign In Firebase Authentication

Storing Data to Firestore

Efficient Exception Handling Technique

Storing Data to Provider

Route Management

Firebase State Persistence

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