app-zj/lib/utils/sp_utils.dart

import 'package:shared_preferences/shared_preferences.dart';

/// 持久化缓存类
///
/// 使用SharedPreferences共享参数存储
class SPUtils {
  SPUtils._();

  static SPUtils? _instance;

  static SPUtils getInstance() => _instance ??= SPUtils._();

  late SharedPreferences _sp;

  Future<void> init() async {
    _sp = await SharedPreferences.getInstance();
  }

  /// 获取所有key
  Set<String> getKeys() {
    return _sp.getKeys();
  }

  /// 是否有key
  bool containsKey(String key) {
    return _sp.containsKey(key);
  }

  /// 以k,v形式 存储各种类型的值
  ///
  Future<bool> saveString(String key, String value) async {
    return await _sp.setString(key, value);
  }

  Future<bool> saveInt(String key, int value) async {
    return await _sp.setInt(key, value);
  }

  Future<bool> saveDouble(String key, double value) async {
    return await _sp.setDouble(key, value);
  }

  Future<bool> saveBool(String key, bool value) async {
    return await _sp.setBool(key, value);
  }

  Future<bool> saveStringList(String key, List<String> value) async {
    return await _sp.setStringList(key, value);
  }

  /// 获取存储的数据
  ///
  String? getString(String key) {
    return _sp.getString(key);
  }

  int? getInt(String key) {
    return _sp.getInt(key);
  }

  double? getDouble(String key) {
    return _sp.getDouble(key);
  }

  bool? getBool(String key) {
    return _sp.getBool(key);
  }

  List<String>? getStringList(String key) {
    return _sp.getStringList(key);
  }

  /// 移除存储的数据
  ///
  Future<bool> remove(String key) async {
    return await _sp.remove(key);
  }

  Future<bool> clear() async {
    return await _sp.clear();
  }
}