我想保护我的会员区应用程序。如果用户不登录，我想重定向他。我使用flutter和安卓工作室。我想我需要在页面的开头设置一个小代码来测试我的全局变量"；用户id"；如果是，我会显示正常页面，如果不是，我会重定向到我的登录页面，但我在代码中看不到具体如何做到这一点。这是我的会员区flutter代码主页。艺术：globals.id_membere是成员id，现在它是我了解成员是否登录的解决方案。当我注销时，我设置了空的全局。id_membere
import 'package:flutter/material.dart';
import 'login.dart';
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'dart:async';
import 'package:flutter_secure_storage/flutter_secure_storage.dart';
import 'menu_member.dart';
import 'globals.dart' as globals;
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
import 'appbar_draw.dart';
import 'liste_tombolas.dart';
import 'package:awesome_page_transitions/awesome_page_transitions.dart';
import 'liste_grille_lotto.dart';
import 'grille_lotosport.dart';
import 'liste_pronostics.dart';
import 'liste_grattage.dart';
import 'win_gem.dart';
class HomePage extends StatefulWidget {
HomePage_State createState() {
return HomePage_State();
}
}
class HomePage_State extends State<HomePage> {
// User Logout Function.
Future logout(BuildContext context) async {
final storage = new FlutterSecureStorage();
await storage.deleteAll();
globals.id_membre="";
Navigator.push(
context,
MaterialPageRoute(builder: (context) => LoginPage())
);
}
@override
Widget build(BuildContext context) {
return Stack(
children: <Widget>[
Container(
decoration: BoxDecoration(
gradient: LinearGradient(
begin: Alignment.topLeft,
end: Alignment.bottomRight,
colors: <Color>[
Colors.blue[300],Colors.blue[400]
],
),
),
),
Scaffold(
appBar: drawappbar(true),
backgroundColor: Colors.transparent,
drawer: new DrawerOnly(className: HomePage()),
body: Center(
child:
Column(children: <Widget>[
Container(
height: 50,
width: MediaQuery.of(context).size.width,
padding : EdgeInsets.only(left: 20, right:20),
margin: EdgeInsets.only(top:10),
color: Colors.blue[700],
child: Center(
child:
Text("BIENVENUE",style: TextStyle(fontSize: 13, color: Colors.white))
)
),
Container(
height: 50,
width: MediaQuery.of(context).size.width,
padding : EdgeInsets.only(left: 20, right:20),
margin: EdgeInsets.only(top:10),
color: Colors.blue[700],
child: Center(
child:
Text("1 - GAGNEZ DES GEMS",style: TextStyle(fontSize: 13, color: Colors.white))
)
),
Container(
margin: EdgeInsets.only(top:10),
child : RaisedButton(
color: Colors.green,
textColor: Colors.white,
padding: EdgeInsets.fromLTRB(
9, 9, 9, 9),
child: Text(
'CLIQUEZ ICI'),
onPressed: () {
Navigator.push(context,
AwesomePageRoute(
transitionDuration: Duration(milliseconds: 600),
exitPage: widget,
enterPage: Gem(),
transition: CubeTransition(),
)
);
},
),
),
Container(
height: 50,
width: MediaQuery.of(context).size.width,
padding : EdgeInsets.only(left: 20, right:20),
margin: EdgeInsets.only(top:0,bottom:20),
color: Colors.blue[700],
child: Center(
child:
Text("2 - JOUEZ VOS GEMS SUR NOS JEUX",style: TextStyle(fontSize: 13, color: Colors.white))
)
),
Expanded(
child : ListView(
children : <Widget>[
Container(
height: 30,
width: MediaQuery.of(context).size.width,
margin: EdgeInsets.only(left:20,right:20),
decoration: BoxDecoration(
border: Border.all(
color: Colors.blue[700],
width: 2,
),
borderRadius: BorderRadius.only(topLeft : Radius.circular(25),topRight: Radius.circular(25)),
color: Colors.blue[700]
),
child : new Text("TOMBOLA",textAlign: TextAlign.center,style: TextStyle(fontSize: 18.0,fontWeight: FontWeight.w500,color: Colors.white),),
),
Container(
height:100,
width: MediaQuery.of(context).size.width,
margin: EdgeInsets.only(bottom:20,left:20,right:20),
decoration: BoxDecoration(
border: Border.all(
color: Colors.grey[500],
width: 2,
),
borderRadius: BorderRadius.only(bottomLeft : Radius.circular(25),bottomRight: Radius.circular(25)),
color:Colors.white,
),
child: Column(children: <Widget>[
Container(
margin: EdgeInsets.only(top:10),
child:
Text("GAGNEZ JUSQU'A 1 000 000 € !!!",textAlign: TextAlign.center,style: TextStyle(fontSize: 15.0,fontWeight: FontWeight.w500,color: Colors.black)),
),
Container(
margin: EdgeInsets.only(top:10),
child : RaisedButton(
color: Colors.green,
textColor: Colors.white,
padding: EdgeInsets.fromLTRB(
9, 9, 9, 9),
child: Text(
'PARTICIPEZ'),
onPressed: () {
Navigator.push(context,
AwesomePageRoute(
transitionDuration: Duration(milliseconds: 600),
exitPage: widget,
enterPage: Affiche_Liste_Tombola(),
transition: CubeTransition(),
)
);
},
),
)
]
)
),
Container(
height: 30,
margin: EdgeInsets.only(left:20,right:20),
width: MediaQuery.of(context).size.width,
decoration: BoxDecoration(
border: Border.all(
color: Colors.blue[700],
width: 2,
),
borderRadius: BorderRadius.only(topLeft : Radius.circular(25),topRight: Radius.circular(25)),
color: Colors.blue[700]
),
child : new Text("LOTO",textAlign: TextAlign.center,style: TextStyle(fontSize: 18.0,fontWeight: FontWeight.w500,color: Colors.white),),
),
Container(
height: 100,
width: MediaQuery.of(context).size.width,
margin: EdgeInsets.only(bottom:20,left:20,right:20),
decoration: BoxDecoration(
border: Border.all(
color: Colors.grey[500],
width: 2,
),
borderRadius: BorderRadius.only(bottomLeft : Radius.circular(25),bottomRight: Radius.circular(25)),
color:Colors.white,
),
child: Column(children: <Widget>[
Container(
margin: EdgeInsets.only(top:10),
child:
Text("CHOISISSEZ 5 NUMEROS SUR 49",textAlign: TextAlign.center,style: TextStyle(fontSize: 15.0,fontWeight: FontWeight.w500,color: Colors.black)),
),
Container(
margin: EdgeInsets.only(top:10),
child : RaisedButton(
color: Colors.green,
textColor: Colors.white,
padding: EdgeInsets.fromLTRB(
9, 9, 9, 9),
child: Text(
'PARTICIPEZ'),
onPressed: () {
Navigator.push(context,
AwesomePageRoute(
transitionDuration: Duration(milliseconds: 600),
exitPage: widget,
enterPage: Affiche_Liste_Lotto(),
transition: CubeTransition(),
)
);
},
),
)
]
)
),
Container(
height: 30,
width: MediaQuery.of(context).size.width,
margin: EdgeInsets.only(left:20,right:20),
decoration: BoxDecoration(
border: Border.all(
color: Colors.blue[700],
width: 2,
),
borderRadius: BorderRadius.only(topLeft : Radius.circular(25),topRight: Radius.circular(25)),
color: Colors.blue[700]
),
child : new Text("PRONOSTICS SPORTIFS",textAlign: TextAlign.center,style: TextStyle(fontSize: 18.0,fontWeight: FontWeight.w500,color: Colors.white),),
),
Container(
height: 200,
width: MediaQuery.of(context).size.width,
margin: EdgeInsets.only(bottom:20, right:20, left:20),
decoration: BoxDecoration(
border: Border.all(
color: Colors.grey[500],
width: 2,
),
borderRadius: BorderRadius.only(bottomLeft : Radius.circular(25),bottomRight: Radius.circular(25)),
color:Colors.white,
),
child: Column(children: <Widget>[
Container(
margin: EdgeInsets.only(top:10),
child:
Text("GRILLE LOTOSPORT",textAlign: TextAlign.center,style: TextStyle(fontSize: 15.0,fontWeight: FontWeight.w500,color: Colors.black)),
),
Container(
margin: EdgeInsets.only(top:10),
child : RaisedButton(
color: Colors.green,
textColor: Colors.white,
padding: EdgeInsets.fromLTRB(
9, 9, 9, 9),
child: Text(
'JOUEZ AU LOTOSPORT'),
onPressed: () {
Navigator.push(context,
AwesomePageRoute(
transitionDuration: Duration(milliseconds: 600),
exitPage: widget,
enterPage: Affiche_Liste_grille(),
transition: CubeTransition(),
)
);
},
),
),
const Divider(
color: Colors.black,
height: 10,
thickness: 1,
indent: 0,
endIndent: 0,
),
Container(
margin: EdgeInsets.only(top:10),
child:
Text("PRONOSTIQUEZ DES MATCHS",textAlign: TextAlign.center,style: TextStyle(fontSize: 15.0,fontWeight: FontWeight.w500,color: Colors.black)),
),
Container(
margin: EdgeInsets.only(top:10),
child : RaisedButton(
color: Colors.green,
textColor: Colors.white,
padding: EdgeInsets.fromLTRB(
9, 9, 9, 9),
child: Text(
'JOUEZ A LOTOMATCH'),
onPressed: () {
Navigator.push(context,
AwesomePageRoute(
transitionDuration: Duration(milliseconds: 600),
exitPage: widget,
enterPage: Affiche_Matchs(),
transition: CubeTransition(),
)
);
},
),
),
]
)
),
Container(
height: 30,
width: MediaQuery.of(context).size.width,
margin: EdgeInsets.only(left:20,right:20),
decoration: BoxDecoration(
border: Border.all(
color: Colors.blue[700],
width: 2,
),
borderRadius: BorderRadius.only(topLeft : Radius.circular(25),topRight: Radius.circular(25)),
color: Colors.blue[700]
),
child : new Text("TICKETS A GRATTER",textAlign: TextAlign.center,style: TextStyle(fontSize: 18.0,fontWeight: FontWeight.w500,color: Colors.white),),
),
Container(
height:100,
width: MediaQuery.of(context).size.width,
margin: EdgeInsets.only(bottom:20,left:20,right:20),
decoration: BoxDecoration(
border: Border.all(
color: Colors.grey[500],
width: 2,
),
borderRadius: BorderRadius.only(bottomLeft : Radius.circular(25),bottomRight: Radius.circular(25)),
color:Colors.white,
),
child: Column(children: <Widget>[
Container(
margin: EdgeInsets.only(top:10),
child:
Text("GRATTEZ ET GAGNEZ DES € !!!",textAlign: TextAlign.center,style: TextStyle(fontSize: 15.0,fontWeight: FontWeight.w500,color: Colors.black)),
),
Container(
margin: EdgeInsets.only(top:10),
child : RaisedButton(
color: Colors.green,
textColor: Colors.white,
padding: EdgeInsets.fromLTRB(
9, 9, 9, 9),
child: Text(
'PARTICIPEZ'),
onPressed: () {
Navigator.push(context,
AwesomePageRoute(
transitionDuration: Duration(milliseconds: 600),
exitPage: widget,
enterPage: Affiche_Liste_Grattage(),
transition: CubeTransition(),
)
);
},
),
)
]
)
),
]
)
)
],
)
)
)
]
);
}
}
实现这一点的一种方法是在您的main.dart 中执行类似操作
bool isLoggedIn = false;
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await //while preparing values in your "globals" class here
isLoggedIn = (globals.id_membre != "");
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'My Flutter App',
home: isLoggedIn ? HomePage() : LoginPage(),
),
);
}
}