shared_preferences库
shared_preferences库同时支持Android和ios平台,存键值对信息,进行数据本地持久化存储。
引用方法
在pubspec.yaml文件中添加依赖
shared_preferences: ^0.5.3+4
->查看最新版本
执行$ flutter packages get命令 下载插件
在使用的文件中导入:
import 'package:shared_preferences/shared_preferences.dart';
使用方法
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| SharedPreferences sharedPreferences = await SharedPreferences.getInstance();
sharedPreferences.setString("name", "hehe"); sharedPreferences.setInt("age", 18); sharedPreferences.setDouble("height", 1.72); sharedPreferences.setBool("sex", true); sharedPreferences.setStringList("like", ["MV","Music","Pic"]);
print("=========get****("key")取出存储的数据=============="); print("姓名:"+ sharedPreferences.getString("name")); print("年龄:" + sharedPreferences.getInt("age").toString()); print("身高:"+ sharedPreferences.getDouble("height").toString()); print("性别:"+ ((sharedPreferences.getBool("sex") == true) ? "男":"女")); print("爱好:"+ sharedPreferences.getStringList("like").toString());
print("========getKeys()取出存储的所有key值============="); print(sharedPreferences.getKeys());
print("========set***("key")给已经存在的key重新赋值============="); print("姓名:"+ sharedPreferences.getString("name")); sharedPreferences.setString("name", "feiyv"); print("姓名:"+ sharedPreferences.getString("name"));
print("========containsKey("key")判断存储的是否有某个Key值============="); print("name是否存在:" + sharedPreferences.containsKey("name")); print("rename是否存在:" + sharedPreferences.containsKey("rename"));
print("========remove("key")删除单个Key数据============="); print("年龄:" + sharedPreferences.getInt("age").toString()); sharedPreferences.remove("age"); print("年龄:" + sharedPreferences.getInt("age").toString());
print("========clear清除所有数据============="); sharedPreferences.clear(); print("sharedPreferences.clear();"); print("name是否存在:" + sharedPreferences.containsKey("name").toString()); print("所有的key值:"+ sharedPreferences.getKeys().toString());
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打印数据:
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| flutter: =========get****("key")取出存储的数据============== flutter: 姓名:hehe flutter: 年龄:18 flutter: 身高:1.72 flutter: 性别:男 flutter: 爱好:[MV, Music, Pic]
flutter: ========getKeys()取出存储的所有key值============= flutter: {name, age, height, sex, like}
flutter: ========set****("key")给已经存在的key重新赋值============= flutter: 姓名:hehe flutter: 姓名:feiyv
flutter: ========containsKey("key")判断存储的是否有某个Key值============= flutter: name是否存在:true flutter: rename是否存在:false
flutter: ========remove("key")删除单个Key数据============= flutter: 年龄:18 flutter: 年龄:null
flutter: ========clear清除所有数据============= flutter: sharedPreferences.clear(); flutter: name是否存在:false flutter: 所有的key值:{}
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