Catch exceptions and show them in logs

lib/main.dart

@@ -1,5 +1,6 @@
 import 'dart:convert';
 import 'dart:io';
+import 'dart:ui';
 
 import 'package:dartssh2/dartssh2.dart';
 import 'package:flutter/material.dart';
@@ -21,6 +22,21 @@ import 'authentik_api.dart' as authentik;
 import 'package:app_links/app_links.dart';
 
 void main() {
+  final errorNotifier = ValueNotifier<String?>(null);
+
+  // Fehler-Handler registrieren
+  PlatformDispatcher.instance.onError = (error, stack) {
+    final timeStr = DateTime.now().toIso8601String();
+    final errorMessage = 'Time: $timeStr\nError: $error\nStack: $stack';
+
+    if (errorNotifier.value == null) {
+      errorNotifier.value = errorMessage;
+    } else {
+      errorNotifier.value = errorNotifier.value! + '\n\n' + errorMessage;
+    }
+    return true;
+  };
+
   runApp(
     MultiProvider(
       providers: [
@@ -28,7 +44,7 @@ void main() {
           create: (context) => AuthentikUserSettingsChangeDialogState(),
         ), // Do something (navigation, ...)
       ],
-      child: const MyApp(),
+      child: MyApp(errorNotifier: errorNotifier),
     ),
   );
 }
@@ -57,7 +73,9 @@ String encodePublicKey(OpenSSHEd25519KeyPair keyPair, {String comment = ''}) {
 }
 
 class MyApp extends StatelessWidget {
-  const MyApp({super.key});
+  final ValueNotifier<String?> errorNotifier;
+
+  const MyApp({super.key, required this.errorNotifier});
 
   @override
   Widget build(BuildContext context) {
@@ -66,15 +84,23 @@ class MyApp extends StatelessWidget {
       theme: ThemeData(
         colorScheme: ColorScheme.fromSeed(seedColor: Colors.yellow),
       ),
-      home: const MyHomePage(title: 'LeineLab e.V. Key App'),
+      home: MyHomePage(
+        title: 'LeineLab e.V. Key App',
+        errorNotifier: errorNotifier,
+      ),
     );
   }
 }
 
 class MyHomePage extends StatefulWidget {
-  const MyHomePage({super.key, required this.title});
+  const MyHomePage({
+    super.key,
+    required this.title,
+    required this.errorNotifier,
+  });
 
   final String title;
+  final ValueNotifier<String?> errorNotifier;
 
   @override
   State<MyHomePage> createState() => _MyHomePageState();
@@ -402,6 +428,31 @@ class _MyHomePageState extends State<MyHomePage> {
       ),
     );
 
+    final bodyComponentLogs = Center(
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: <Widget>[
+          Padding(
+            padding: EdgeInsets.all(20),
+            child: Card(
+              child: ValueListenableBuilder<String?>(
+                valueListenable: widget.errorNotifier,
+                builder: (context, error, child) {
+                  if (error != null) {
+                    return Text(
+                      "Error: $error",
+                      style: TextStyle(color: Colors.red, fontSize: 15),
+                    );
+                  }
+                  return Text("No exceptions captured yet.");
+                },
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
+
     final actionButtonInfo = FloatingActionButton(
       onPressed: () => obtainKeyPair(regenerate: true),
       tooltip: 'Regenerate Key',
@@ -419,6 +470,10 @@ class _MyHomePageState extends State<MyHomePage> {
       // Info page
       bodyComponent = bodyComponentInfo;
       actionButton = actionButtonInfo;
+    } else if (navIndex == 2) {
+      // Logs page
+      bodyComponent = bodyComponentLogs;
+      actionButton = null;
     } else {
       throw Exception('Unknown navIndex: $navIndex');
     }
@@ -456,6 +511,15 @@ class _MyHomePageState extends State<MyHomePage> {
                 Navigator.pop(context);
               },
             ),
+            ListTile(
+              title: const Text('Logs'),
+              onTap: () {
+                setState(() {
+                  navIndex = 2;
+                });
+                Navigator.pop(context);
+              },
+            ),
           ],
         ),
       ),