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import 'package:shared_preferences/shared_preferences.dart';
class SharedPreferencesService {
SharedPreferencesService._privateConstructor();
static final SharedPreferencesService instance =
SharedPreferencesService._privateConstructor();
Future<SharedPreferences> _prefs = SharedPreferences.getInstance();
/// Sets a boolean [value] for the given [key] in the shared preferences.
///
/// Example:
/// ```dart
/// await prefsService.setBool('isLoggedIn', true);
/// ```
Future<void> setBool(String key, bool value) async {
final prefs = await _prefs;
prefs.setBool(key, value);
}
/// Sets a string [value] for the given [key] in the shared preferences.
///
/// Example:
/// ```dart
/// await prefsService.setString('username', 'Alice');
/// ```
Future<void> setString(String key, String value) async {
final prefs = await _prefs;
prefs.setString(key, value);
}
/// Sets an integer [value] for the given [key] in the shared preferences.
///
/// Example:
/// ```dart
/// await prefsService.setInt('age', 30);
/// ```
Future<void> setInt(String key, int value) async {
final prefs = await _prefs;
prefs.setInt(key, value);
}
/// Sets a list of strings [value] for the given [key] in the shared preferences.
///
/// Example:
/// ```dart
/// await prefsService.setStringList('favorites', ['Apples', 'Bananas']);
/// ```
Future<void> setStringList(String key, List<String> value) async {
final prefs = await _prefs;
prefs.setStringList(key, value);
}
/// Retrieves a boolean value for the given [key] from the shared preferences.
///
/// Returns `null` if the key does not exist.
///
/// Example:
/// ```dart
/// bool? isLoggedIn = await prefsService.getBool('isLoggedIn');
/// ```
Future<bool?> getBool(String key) async {
final prefs = await _prefs;
return prefs.getBool(key);
}
/// Retrieves a string value for the given [key] from the shared preferences.
///
/// Returns `null` if the key does not exist.
///
/// Example:
/// ```dart
/// String? username = await prefsService.getString('username');
/// ```
Future<String?> getString(String key) async {
final prefs = await _prefs;
return prefs.getString(key);
}
/// Retrieves an integer value for the given [key] from the shared preferences.
///
/// Returns `null` if the key does not exist.
///
/// Example:
/// ```dart
/// int? age = await prefsService.getInt('age');
/// ```
Future<int?> getInt(String key) async {
final prefs = await _prefs;
return prefs.getInt(key);
}
/// Retrieves a list of strings for the given [key] from the shared preferences.
///
/// Returns `null` if the key does not exist.
///
/// Example:
/// ```dart
/// List<String>? favorites = await prefsService.getStringList('favorites');
/// ```
Future<List<String>?> getStringList(String key) async {
final prefs = await _prefs;
return prefs.getStringList(key);
}
}
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