berlaku online untuk login , namun offline jika sudah login

    status : Success 

1. buat project di firebase

2. daftarkan aplikasi android ke flutter, android/app/src/prifile/manifest.xml copy nama packagenya next register download file google services.json pindahkah filenya ke android/app

   tambahkan "classpath jbla..." ke android/build.gradle tepatnya di bagian dpenencies tambahkan "apli plugin ..." ke app/build.gradle

   next continue to console, pilih authenthication

3. sekarang dengan anonymous di firebase console, mehode anonymus aktifkan

4. ke Flutter project ,yaml file tambahkan,
   firebase_auth, provider, firebase_core,

5. persiapkan tampilan dengan wrapper

wrapper.dart loginpage.dart mainpage.dart

6. buat file file auth_services.dart : import firebase_auth buat kelas auth_services :

               static Firebase _auth = Firebase.instance;

           static Future<FirebaseUser> SigntinAnonnympus() async{

               try{
                   AuthResult reuslt  = await _autho.signInAnonymously();
               firebaseUser firebaseUser = reuslt.user;

               return firebaseUser;
               }
               catch(e){
                   print(e.toString());
                   return null;
               }
           }

           static FUture<void> signOut() async{
               _auth.signOut();
           }

           static Stream<FirebaseUser> get firebaseUserStream => _auth.onAuthStateChanged;

7. pada main.dart inisialisasai Firebase : di

       main(){
           WidgetsFlutterBinding.ensureInitialized();
           await Firebase.initializeApp();
           runApp(MyApp());
       }

   diMyApp return StreamProvider.value() : dart StreamProvider.value( value: AuthServices.firebaseUserStream, child: MaterialApp() );

   diwrappper paanggil firebaseUser : dart User firebaseUser = AuthServices.firebaseUserStream; return firebaesUser == null ? LoginPage(): HomePage();

   diHomePage.dart buat button signOut : dart IconButton(icon:Icon(Icons.logout),onPress:AuthServices.signOut ),

8. Selesai

ref : Video