simple working json import and export

lib/pages/settings_page.dart

@@ -1,15 +1,62 @@
 import 'package:flutter/material.dart';
+import 'package:permission_handler/permission_handler.dart';
 
 import '../l10n/app_localizations.dart';
+import '../service/notifying.dart';
+import '../service/permission_service.dart';
+import '../service/storage.dart';
 
-class SettingsPage extends StatelessWidget {
+class SettingsPage extends StatefulWidget {
   static const routeName = '/settings';
   const SettingsPage({super.key});
 
+  @override
+  State<SettingsPage> createState() => _SettingsPageState();
+}
+
+class _SettingsPageState extends State<SettingsPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(title: Text(AppLocalizations.of(context)!.settings)),
+      body: SizedBox(
+        width: MediaQuery.of(context).size.width * 0.9,
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.center,
+          children: [
+            Text(
+              AppLocalizations.of(context)!.appData,
+              style: Theme.of(context).textTheme.titleLarge,
+            ),
+            ElevatedButton(
+              onPressed: () => onActivateJsonImportPressed(),
+              child: Text(AppLocalizations.of(context)!.import),
+            ),
+            ElevatedButton(
+              onPressed: () => onActivateJsonExportPressed(),
+              child: Text(AppLocalizations.of(context)!.export),
+            ),
+          ],
+        ),
+      ),
     );
   }
+
+  void onActivateJsonExportPressed() async {
+    if (await checkStoragePermission) Storage.exportToJsonFile();
+  }
+
+  void onActivateJsonImportPressed() async {
+    if (await checkStoragePermission) Storage.importFromJsonFile();
+  }
+
+  Future<bool> get checkStoragePermission async {
+    if (!(await PermissionService.requestStoragePermission).isGranted) {
+      if (mounted) {
+        Notifying.showStoragePermissionErrorSnackbar(context);
+        return false;
+      }
+    }
+    return true;
+  }
 }