first aut

lib/anonym_aut.dart

@@ -0,0 +1,45 @@
+import 'package:flutter/material.dart';
+import 'package:firebase_auth/firebase_auth.dart';
+import 'package:provider/provider.dart';
+
+class AuthState extends ChangeNotifier {
+  FirebaseAuth auth = FirebaseAuth.instance;
+  bool _isSignedIn = false;
+
+  bool get isSignedIn => _isSignedIn;
+
+  Future<void> signInAnonymously() async {
+    try {
+      await auth.signInAnonymously();
+      _isSignedIn = true;
+      notifyListeners();
+    } catch (e) {
+      print(e);
+    }
+  }
+
+  Future<void> signOut() async {
+    await auth.signOut();
+    _isSignedIn = false;
+    notifyListeners();
+  }
+}
+class AnonymAuthScreen extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Center(
+        child: Consumer<AuthState>(
+          builder: (context, authState, child) {
+            return ElevatedButton(
+              onPressed: authState.isSignedIn
+                  ? authState.signOut
+                  : authState.signInAnonymously,
+              child: Text(authState.isSignedIn ? 'Abmelden' : 'Anonym anmelden'),
+            );
+          },
+        ),
+      ),
+    );
+  }
+}