Flutter进阶第进阶第10篇：篇： 本地存储，封装本地存储类，实现最简单本地存储，封装本地存储类，实现最简单
的状态管理的状态管理
引入第三方库：shared_preferences
设置值：设置值：
SharedPreferences prefs = await SharedPreferences.getInstance();
prefs.setString(key, value);
prefs.setBool(key, value)
prefs.setDouble(key, value)
prefs.setInt(key, value)
prefs.setStringList(key, value)
获取值：获取值：
SharedPreferences prefs = await SharedPreferences.getInstance();
var data=prefs.getString("name");
删除值：删除值：
SharedPreferences prefs = await SharedPreferences.getInstance();
prefs.remove(key); //删除指定键
prefs.clear();//清空键值对
完整代码：完整代码：
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
class StoragePage extends StatefulWidget {
StoragePage({Key key}) : super(key: key);
_StoragePageState createState() => _StoragePageState();
}
class _StoragePageState extends State {
_saveData() async{
SharedPreferences sp=await SharedPreferences.getInstance();
sp.setString("username", "张三111");
sp.setString("age", "26");
}
_getData() async{
SharedPreferences sp=await SharedPreferences.getInstance();
print(sp.getString("username"));
print(sp.getString("age"));
}
_removeData() async{
SharedPreferences sp=await SharedPreferences.getInstance();
print(sp.remove("age"));
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("本地存储"),
),
body: Center(
child: Column(mainAxisAlignment: MainAxisAlignment.center, children: [
RaisedButton(
child: Text('保存数据'),
onPressed: _saveData,
),
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