Flutter本地存储
Flutter本地存储可以使用第三方库 shared_preferences实现。
Flutter 本地存储里面常用的一些法方
1、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)
2、获取值
SharedPreferences prefs = await SharedPreferences.getInstance();
var data=prefs.getString("name");
3、删除值
SharedPreferences prefs = await SharedPreferences.getInstance();
prefs.remove(key); //删除指定键
prefs.clear();//清空键值对
Flutter 本地存储完整demo
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<StoragePage> {
_saveData() async{
SharedPreferences prefs = await SharedPreferences.getInstance();
prefs.setString("name", "张三");
// prefs.setBool(key, value)
// prefs.setDouble(key, value)
// prefs.setInt(key, value)
// prefs.setStringList(key, value)
}
_getData() async{
SharedPreferences prefs = await SharedPreferences.getInstance();
var data=prefs.getString("name");
print(data);
}
@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,
),
SizedBox(height: 10),
RaisedButton(
child: Text('获取数据'),
onPressed:_getData,
)
]),
),
);
}
}