final

lib/dialog/image_viewer.dart

@@ -3,10 +3,9 @@ import 'package:flutter/material.dart';
 import 'package:photo_view/photo_view.dart';
 
 class ImageViewer extends StatefulWidget {
-  final Key key;
   final ImageProvider imageProvider;
 
-  ImageViewer(this.imageProvider, {this.key}) :
+  ImageViewer(this.imageProvider, {Key? key}) :
       super(key: key);
 
   @override

lib/dialog/logout_dialog.dart

@@ -33,18 +33,15 @@ AlertDialog logoutDialog(BuildContext context) {
             .yes_i_am_sure),
         onPressed: () {
           Navigator.of(context).pop();
-          Utils.getBox().then((box) {
-            box.delete(Constants.KEY_USER_ID);
-            box.delete(
-                Constants.KEY_ACCESS_TOKEN);
-            store.dispatch(
-                new UpdateCurrentUser(null));
-            eventBus.fire(
-                new OnCurrentUserUpdated());
-            Routes.router.navigateTo(
-                context, '/', replace: true,
-                clearStack: true);
-          });
+          Utils.prefs?.remove(Constants.KEY_USER_ID);
+          Utils.prefs?.remove(Constants.KEY_ACCESS_TOKEN);
+          store.dispatch(
+              new UpdateCurrentUser(null));
+          eventBus.fire(
+              new OnCurrentUserUpdated());
+          Routes.router.navigateTo(
+              context, '/', replace: true,
+              clearStack: true);
         },
       )
     ],