diff --git a/lib/app.dart b/lib/app.dart
index 9749023..3757d4f 100644
--- a/lib/app.dart
+++ b/lib/app.dart
@@ -15,39 +15,6 @@ class MyApp extends StatelessWidget {
     final auth = Provider.of<AuthModel>(context);
     final theme = Provider.of<ThemeModel>(context);
 
-    // ignore: prefer_function_declarations_over_variables
-    final LocaleListResolutionCallback localeListResolutionCallback =
-        (locales, supportedLocales) {
-      // 1. user set locale
-      // 2. system locale
-      try {
-        if (theme.locale != null) {
-          final intlLocale = l.Locale.parse(theme.locale!);
-          locales = [
-            Locale.fromSubtags(
-              languageCode: intlLocale.languageCode,
-              countryCode: intlLocale.countryCode,
-              scriptCode: intlLocale.scriptCode,
-            ),
-            ...locales!
-          ];
-        }
-      } catch (err) {
-        print(err);
-      }
-
-      for (final locale in locales!) {
-        // this is necessary because Flutter only handles zh_Hans -> zh
-        // and would not handle non-exist language code
-        if (AppLocalizations.delegate.isSupported(locale)) {
-          return locale;
-        }
-      }
-
-      // 3. if none match, use the default
-      return supportedLocales.firstWhere((l) => l.languageCode == 'en');
-    };
-
     return AntTheme(
       key: auth.rootKey,
       data: AntThemeData(brightness: theme.brightness),
@@ -72,7 +39,36 @@ class MyApp extends StatelessWidget {
             ),
             localizationsDelegates: AppLocalizations.localizationsDelegates,
             supportedLocales: AppLocalizations.supportedLocales,
-            localeListResolutionCallback: localeListResolutionCallback,
+            localeListResolutionCallback: (locales, supportedLocales) {
+              // 1. user set locale
+              // 2. system locale
+              try {
+                if (theme.locale != null) {
+                  final intlLocale = l.Locale.parse(theme.locale!);
+                  locales = [
+                    Locale.fromSubtags(
+                      languageCode: intlLocale.languageCode,
+                      countryCode: intlLocale.countryCode,
+                      scriptCode: intlLocale.scriptCode,
+                    ),
+                    ...locales!
+                  ];
+                }
+              } catch (err) {
+                print(err);
+              }
+
+              for (final locale in locales!) {
+                // this is necessary because Flutter only handles zh_Hans -> zh
+                // and would not handle non-exist language code
+                if (AppLocalizations.delegate.isSupported(locale)) {
+                  return locale;
+                }
+              }
+
+              // 3. if none match, use the default
+              return supportedLocales.firstWhere((l) => l.languageCode == 'en');
+            },
           );
         },
       ),