首先在 pubspec.yaml 文件中添加 shared_preferences 引用并 Packages get

dependencies:
  flutter:
    sdk: flutter

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  shared_preferences: ^0.4.2

然后封装 SharedPreferences 工具类

import 'package:shared_preferences/shared_preferences.dart';

/**
 * @des SharedPreferences 工具类
 * @author liyongli 20190522
 * */
class SharedPreferencesDataUtils{

  // 保存数据
  Future setUserInfo(key, value) async{
    SharedPreferences sp = await SharedPreferences.getInstance();
    sp.setString(key, value);
  }

  // 获取数据
  Future getUserInfo(key) async{
    SharedPreferences sp = await SharedPreferences.getInstance();
    print(sp.get(key));
    return sp.get(key);
  }

  // 清除数据
  Future deleteUserInfo(key) async{
    SharedPreferences sp = await SharedPreferences.getInstance();
    sp.remove(key);
  }

}

调用方式

    SharedPreferencesDataUtils spDataUtils = new SharedPreferencesDataUtils();

    spDataUtils.setUserInfo("name","Flutter Flutter Flutter");
    spDataUtils.setUserInfo("type","Save Save Save");

    print(dataUtils.getUserInfo("name"));
    print(dataUtils.getUserInfo("type"));

运行结果

    I/flutter (13801): Flutter Flutter Flutter
    I/flutter (13801): Save Save Save

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