made settingsservice to collection of util functions to prevent diffrent instances and therefore different states

lib/pages/main_page.dart

@@ -16,7 +16,6 @@ class MyHomePage extends StatefulWidget {
 
 class MyHomePageState extends State<MyHomePage> {
   int _selectedIndex = 4;
-  final SettingsService settingsService = SettingsService();
 
   final List<String> _titles = [
     'Stimmung',
@@ -33,17 +32,15 @@ class MyHomePageState extends State<MyHomePage> {
     SettingsPage(),
   ];
 
-  void _onItemTapped(int index) {
+  Future<void> _onItemTapped(int index) async {
-    setState(() async {
+    bool isConfigured = (await getGroup()) != null;
-      (await settingsService.getGroup() != null)
+    print('Gruppe:  ${await getGroup()}, isConfigured: $isConfigured');
+    setState(() {
+      isConfigured
           ? _selectedIndex = index
           : showDialog(
               context: context,
               builder: (BuildContext context) {
-                Future.delayed(
-                    const Duration(seconds: 3),
-                    () => Navigator.of(context)
-                        .pop(true)); //Dismiss popup after 3 seconds
                 return const MissingConfigPopup();
               });
     });

lib/pages/scanner_page.dart

@@ -3,7 +3,6 @@ import 'package:smoke_cess_app/service/settings_service.dart';
 
 class SettingsPage extends StatelessWidget {
   SettingsPage({super.key});
-  SettingsService service = SettingsService();
 
   @override
   Widget build(BuildContext context) {
@@ -17,7 +16,7 @@ class SettingsPage extends StatelessWidget {
           style: ElevatedButton.styleFrom(
               textStyle: const TextStyle(fontSize: 20)),
           onPressed: () {
-            service.loadSettings();
+            loadSettings();
           },
           child: const Text('Read JSON'),
         )

lib/pages/timer_page.dart

@@ -11,7 +11,6 @@ class StopWatchTimerPage extends StatefulWidget {
 }
 
 class StopWatchTimerPageState extends State<StopWatchTimerPage> {
-  SettingsService settings = SettingsService();
   Duration duration = const Duration(minutes: 1);
   Timer? timer;
 
@@ -19,22 +18,12 @@ class StopWatchTimerPageState extends State<StopWatchTimerPage> {
 
   @override
   void initState() {
-    setDurationWithSetting();
     super.initState();
   }
 
-  void setDurationWithSetting() {
-    settings.getIntSetting('workout_duration_minutes').then((workoutMinutes) =>
-        {setState(() => duration = Duration(minutes: workoutMinutes ?? 10))});
-  }
-
   void reset() {
-    if (countDown) {
-      setDurationWithSetting();
-    } else {
     setState(() => duration = const Duration());
   }
-  }
 
   void startTimer() {
     timer = Timer.periodic(const Duration(seconds: 1), (_) => addTime());

lib/service/settings_service.dart

@@ -2,48 +2,42 @@ import 'package:shared_preferences/shared_preferences.dart';
 import 'package:smoke_cess_app/models/settings.dart';
 import 'package:smoke_cess_app/service/json_service.dart';
 
-class SettingsService {
+final Future<SharedPreferences> _prefs = SharedPreferences.getInstance();
-  final Future<SharedPreferences> _prefs = SharedPreferences.getInstance();
 
-  SettingsService() {
+//access group setting which was saved in local storage
-    setIntSetting('workout_duration_minutes', 5);
+Future<String?> getGroup() {
-  }
-
-  //access group setting which was saved in local storage
-  Future<String?> getGroup() {
   return getStringSetting('group');
-  }
+}
 
-  void setStringSetting(String settingKey, String settingValue) =>
+void setStringSetting(String settingKey, String settingValue) =>
     _prefs.then((pref) => pref.setString(settingKey, settingValue));
 
-  Future<String?> getStringSetting(String settingKey) =>
+Future<String?> getStringSetting(String settingKey) =>
     _prefs.then((pref) => pref.getString(settingKey));
 
-  void setIntSetting(String settingKey, int settingValue) =>
+void setIntSetting(String settingKey, int settingValue) =>
     _prefs.then((pref) => pref.setInt(settingKey, settingValue));
 
-  Future<int?> getIntSetting(String settingKey) =>
+Future<int?> getIntSetting(String settingKey) =>
     _prefs.then((pref) => pref.getInt(settingKey));
 
-  void setStringList(String settingKey, List<String> list) =>
+void setStringList(String settingKey, List<String> list) =>
     _prefs.then((pref) => pref.setStringList(settingKey, list));
 
-  //Add other setters and getters if needed
+//Add other setters and getters if needed
-  //other possible SharedPreferences Types: Int, Bool, Double, StringList
+//other possible SharedPreferences Types: Int, Bool, Double, StringList
-  //see https://pub.dev/packages/shared_preferences
+//see https://pub.dev/packages/shared_preferences
 
-  Future<void> loadSettings() async {
+Future<void> loadSettings() async {
   Map<String, dynamic> configJSON = await loadLocalConfigJSON();
   Settings settings = Settings.fromJson(configJSON);
   print(settings.group);
   saveSettings(settings);
   String gruppe = (await getGroup())!;
   print('Gruppe: $gruppe');
-  }
+}
 
-  void saveSettings(Settings settings) {
+void saveSettings(Settings settings) {
   setStringSetting('group', settings.group);
   setStringSetting('key', settings.key);
-  }
 }