如何检查用户是否首次打开我的应用(Flutter应用,飞镖代码) [英] How to check If user open my app first time (Flutter App,Dart Code)
问题描述
我是一个初学者,我创建了我的应用程序,但是我想检查用户是否在安装后第一次打开该应用程序,我看到了
I am a beginner in flutter, I have created my application but I want to check if the user opens the application for the first time after installing, I have seen this article but did not know how that?
这是启动屏幕代码,该代码会在3秒钟后将用户直接移动到主屏幕,但是我想检查用户是否是第一次打开应用并将用户移动到欢迎"屏幕,或者是否不是用户第一次将用户移动到主屏幕.屏幕.
This is the splash screen code, the code move the user directly to Main screen after 3 sec, But I want check if user first time open app and move user to Welcome screen or if user not first time and move user to Main screen.
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:book_pen/main.dart';
import 'package:book_pen/Welcome.dart';
void main() {
runApp(new MaterialApp(
home: new SplashScreen(),
routes: <String, WidgetBuilder>{
'/HomePage': (BuildContext context) => new HomePage(),
'/WelcomePage': (BuildContext context) => new WelcomePage()
},
));
}
class SplashScreen extends StatefulWidget {
@override
_SplashScreenState createState() => new _SplashScreenState();
}
class _SplashScreenState extends State<SplashScreen> {
startTime() async {
var _duration = new Duration(seconds: 3);
return new Timer(_duration, navigationPageHome);
}
void navigationPageHome() {
Navigator.of(context).pushReplacementNamed('/HomePage');
}
void navigationPageWel() {
Navigator.of(context).pushReplacementNamed('/WelcomePage');
}
@override
void initState() {
super.initState();
startTime();
}
@override
Widget build(BuildContext context) {
Size size = MediaQuery.of(context).size;
return Scaffold(
body: Stack(
children: <Widget>[
Center(
child: new Image.asset(
'assets/images/SplashBack.jpg',
width: size.width,
height: size.height,
fit: BoxFit.fill,
),
),
Center(
child: new Image.asset(
'assets/images/BigPurppleSecSh.png',
height: 150,
width: 300,
)),
],
),
);
}
}
推荐答案
@Abdullrahman,请使用其他人建议的shared_preferences
.这是您的方法,
@Abdullrahman, please use shared_preferences
as suggested by others. Here is how you can do that,
- 取决于
pubspec.yaml
中的shared_preferences程序包并运行Packages get
:
- Depend on shared_preferences package in
pubspec.yaml
and runPackages get
:
dependencies:
flutter:
sdk: flutter
shared_preferences: ^0.5.4+6
- 导入软件包:
import 'package:shared_preferences/shared_preferences.dart';
- 实施:
class _SplashScreenState extends State<SplashScreen> {
startTime() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
bool firstTime = prefs.getBool('first_time');
var _duration = new Duration(seconds: 3);
if (firstTime != null && !firstTime) {// Not first time
return new Timer(_duration, navigationPageHome);
} else {// First time
prefs.setBool('first_time', false);
return new Timer(_duration, navigationPageWel);
}
}
void navigationPageHome() {
Navigator.of(context).pushReplacementNamed('/HomePage');
}
void navigationPageWel() {
Navigator.of(context).pushReplacementNamed('/WelcomePage');
}
........
注意:如果用户清除了缓存,则SharedPreferences数据将被删除. SharePreferences是一个本地选项.如果您想避免这种情况,可以使用firestore来保存bool值,但是对于这样的简单任务,firestore可能会显得过大.
Note: SharedPreferences data will be removed if user clears the cache. SharePreferences is a local option. If you want to prevent that, you can use firestore to save bool value but firestore would probably be an overkill for a simple task like this.
希望这会有所帮助.
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