feat：参照研听的基础工程

lib/common/storage/storage_service.dart

@@ -0,0 +1,20 @@
+import 'package:shared_preferences/shared_preferences.dart';
+
+class StorageService {
+  StorageService._(this._prefs);
+  final SharedPreferences _prefs;
+  static StorageService? _instance;
+  static StorageService get to => _instance!;
+
+  static Future<StorageService> get instance async {
+    if (_instance != null) return _instance!;
+    final prefs = await SharedPreferences.getInstance();
+    _instance = StorageService._(prefs);
+    return _instance!;
+  }
+
+  bool getBool(String key, {bool def = false}) => _prefs.getBool(key) ?? def;
+  Future<void> setBool(String key, bool v) => _prefs.setBool(key, v);
+  String? getString(String key) => _prefs.getString(key);
+  Future<void> setString(String key, String v) => _prefs.setString(key, v);
+}