Flutter oddly not reloading widget - flutter

Question

I have been working with flutter just a while now but I have never experienced such a weird problem. basically I'm checking if there is a logged on username show them the main page and if not show them the signup page. after the user signs up (and logs in at the same time) I want to take him to my main page. even though I return a new Scaffold the mobile screen doesn't change at all. not with a hot load or anything. but after stopping the program and running it again (because the user is logged in) it automatically goes to my main page (which I want to do without having to stop the program and running it again. any ideas why this is happening couldn't find anything related to this.
import 'package:sociagrowapp/models/user.dart';
import 'package:sociagrowapp/Authenticate/SignIn.dart';
import 'package:sociagrowapp/HomePages/Home.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
class Wrapper extends StatefulWidget{
#override
createState() => _Wrapper();
}
class _Wrapper extends State<Wrapper> {
#override
Widget build(BuildContext context) {
final user = Provider.of<User>(context);
print(user);
// return either the Home or Authenticate widget
if (user == null){
print('Should Changed 3');
return Scaffold(
body: SignIn()
);
}
else {
print('Should Changed');
print('Should Changed2');
return PageData()
}
}
}
Just in case I will add the PagesData Code but I don't think it is related to that.
import 'package:flutter/material.dart';
import 'package:sociagrowapp/services/auth.dart';
int selectedbotnavi = 0;
class DailyTasks extends StatefulWidget
{
#override
createState() => _DailyTasks();
}
class _DailyTasks extends State<DailyTasks>
{
Widget build(BuildContext context)
{
return Center(
child: Text("15")
);
}
}
class Settings extends StatefulWidget
{
#override
createState() => _Settings();
}
class _Settings extends State<Settings>
{
String _httpdataretrieved;
Widget build(BuildContext context)
{
return Column(
children: <Widget>[
Container(width:MediaQuery.of(context).size.width,
child: Text('Your Account Username',style: TextStyle(fontWeight: FontWeight.w400),),
alignment: Alignment.center,
padding: EdgeInsetsDirectional.fromSTEB(0, 20, 0, 0),
),
Container(width:MediaQuery.of(context).size.width,
child: Text(' Important: Your Account must be public for SociaGrow. \n There are limited Features available to private Accounts',style: TextStyle(fontWeight: FontWeight.w900,fontSize:14),
),
alignment: Alignment.center,
padding: EdgeInsetsDirectional.fromSTEB(0, 5, 0, 20),
),
Container(child: TextField(
obscureText: true,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'Username',
),
),
width: MediaQuery.of(context).size.width * 0.8,
alignment: Alignment.center,
padding: EdgeInsetsDirectional.fromSTEB(0, 0, 0, 15),
),
Container(
child: RaisedButton(
child: Text('Change Username'),
),
)
],
);
}
}
List <Widget> Pages = [new DailyTasks(),new DailyTasks(),new DailyTasks()];
class PageData extends StatefulWidget
{
#override
createState() => _PageData();
}
class _PageData extends State<PageData>
{
void _changeselectbotnaviindex(int index)
{
selectedbotnavi = index;
setState(() {
});
}
final AuthService _auth = AuthService();
#override
Widget build(BuildContext context)
{
return Scaffold(
appBar: AppBar(title: Container(
child: Image.asset('assets/Logo.png',width: 100,height: 200,),
padding: EdgeInsetsDirectional.fromSTEB(0, 10, 0 , 0),
),
actions: <Widget>[
FlatButton(
child: Text('Sign out'),
onPressed: () async {
await this._auth.signOut();
},
),
],
),
body: Pages[selectedbotnavi],
bottomNavigationBar: BottomNavigationBar(
type: BottomNavigationBarType.fixed,
items :[
BottomNavigationBarItem(icon: Icon(Icons.timelapse),title:Text('Daily Tasks')),
BottomNavigationBarItem(icon: Icon(Icons.call_made),title:Text('Growth')),
BottomNavigationBarItem(icon: Icon(Icons.settings),title:Text('Settings')),],
currentIndex: selectedbotnavi,
onTap: _changeselectbotnaviindex,
selectedItemColor: Colors.amber[800],
unselectedItemColor: Colors.black,
showUnselectedLabels: true,
)
);
}
}

Answer 1

That is not the way you navigate to a new page in Flutter.
In Flutter, the way to navigate between pages is with Navigator, which is a widget that manages a set of child widgets with a stack discipline. That is, Navigator has everything ready for you to navigate between pages easily. When you create an app with MaterialApp, Flutter attaches a Navigator to the top of the widget tree for you under the hood. This way, you can access the Navigator in your widget tree via context, by calling Navigator.of(context).
In your case, when the user taps the sign up button in your sign up page, you should do something like:
Navigator.of(context).pushReplacement(MaterialPageRoute(builder: (_) => PageData()));
This way, your app will navigate to PageData when the user signs in.
Check out this Flutter.dev article on navigating pages for more details on the topic.

Answer 2

You have to call SetState() so your build method is called again.
You could add a VoidListener to your SignIn(onLogin:(){setState(() {});})