优化

lib/screens/settings_screen.dart

@@ -11,20 +11,34 @@ class SettingsScreen extends StatefulWidget {
 
   /// Get the saved default duration (for use in other screens)
   static Future<int> getDefaultDuration() async {
-    final prefs = await SharedPreferences.getInstance();
-    return prefs.getInt(_durationKey) ?? 25;
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      return prefs.getInt(_durationKey) ?? 25;
+    } catch (e) {
+      // Return default duration if loading fails
+      return 25;
+    }
   }
 
   /// Get the saved locale
   static Future<String?> getSavedLocale() async {
-    final prefs = await SharedPreferences.getInstance();
-    return prefs.getString(_localeKey);
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      return prefs.getString(_localeKey);
+    } catch (e) {
+      // Return null if loading fails
+      return null;
+    }
   }
 
   /// Save the locale
   static Future<void> saveLocale(String localeCode) async {
-    final prefs = await SharedPreferences.getInstance();
-    await prefs.setString(_localeKey, localeCode);
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      await prefs.setString(_localeKey, localeCode);
+    } catch (e) {
+      // Ignore save errors
+    }
   }
 
   static const String _durationKey = 'default_duration';
@@ -48,36 +62,58 @@ class _SettingsScreenState extends State<SettingsScreen> {
   }
 
   Future<void> _loadSavedDuration() async {
-    final prefs = await SharedPreferences.getInstance();
-    setState(() {
-      _selectedDuration = prefs.getInt(SettingsScreen._durationKey) ?? 25;
-    });
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      setState(() {
+        _selectedDuration = prefs.getInt(SettingsScreen._durationKey) ?? 25;
+      });
+    } catch (e) {
+      // Use default duration if loading fails
+      setState(() {
+        _selectedDuration = 25;
+      });
+    }
   }
 
   Future<void> _loadSavedLocale() async {
-    final prefs = await SharedPreferences.getInstance();
-    setState(() {
-      _selectedLocale = prefs.getString(SettingsScreen._localeKey) ?? 'en';
-    });
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      setState(() {
+        _selectedLocale = prefs.getString(SettingsScreen._localeKey) ?? 'en';
+      });
+    } catch (e) {
+      // Use default locale if loading fails
+      setState(() {
+        _selectedLocale = 'en';
+      });
+    }
   }
 
   Future<void> _saveDuration(int duration) async {
-    final prefs = await SharedPreferences.getInstance();
-    await prefs.setInt(SettingsScreen._durationKey, duration);
-    setState(() {
-      _selectedDuration = duration;
-    });
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      await prefs.setInt(SettingsScreen._durationKey, duration);
+      setState(() {
+        _selectedDuration = duration;
+      });
+    } catch (e) {
+      // Ignore save errors, state will be reset on next load
+    }
   }
 
   Future<void> _saveLocale(String localeCode) async {
-    await SettingsScreen.saveLocale(localeCode);
-    setState(() {
-      _selectedLocale = localeCode;
-    });
+    try {
+      await SettingsScreen.saveLocale(localeCode);
+      setState(() {
+        _selectedLocale = localeCode;
+      });
 
-    // Update locale immediately without restart
-    if (!mounted) return;
-    MyApp.updateLocale(context, localeCode);
+      // Update locale immediately without restart
+      if (!mounted) return;
+      MyApp.updateLocale(context, localeCode);
+    } catch (e) {
+      // Ignore save errors
+    }
   }
 
   @override