Flutter Widgets Binding Observer - flutter

Question

In Flutter,I want to go back to the page I left the app from. But when I try to back, it always navigates to LoginPage. For example,I have 3 page.LoginPage,WorkoutPage,ProgressPage.Login page is my launcher. When I am on ProgressPage, I leave the app. But when I resume,it navigates Login Page.I used this code in login page.
Login Page
class ProgressTabState extends State with WidgetsBindingObserver{
AppLifecycleState state;
#override
void initState() {
// TODO: implement initState
super.initState();
WidgetsBinding.instance.addObserver(this);
}
#override
void dispose() {
// TODO: implement dispose
super.dispose();
WidgetsBinding.instance.removeObserver(this);
}
#override
void didChangeAppLifecycleState(AppLifecycleState appLifecycleState) {
// TODO: implement didChangeAppLifecycleState
super.didChangeAppLifecycleState(state);
state = appLifecycleState;
}
in login page I use this code to navigate to MainTab.
Navigator.push(
context,
MaterialPageRoute(
builder: (_) {
return MainTabs();
},
),
);
in Main tabs I have Tabbarviews with two page. Workoutpage and ProgressPage. This is Workout Page.
class WorkoutTabState extends State <WorkoutTab> {
#override
void initState() {
// TODO: implement initState
super.initState();
}
#override
void dispose() {
// TODO: implement dispose
super.dispose();
}
#override
Widget build(BuildContext context) {
// TODO: implement build
return Scaffold(
body:Text("Workout Page"),
);
}
Progress Page
class ProgressTabState extends State with WidgetsBindingObserver{
AppLifecycleState state;
#override
void initState() {
// TODO: implement initState
super.initState();
WidgetsBinding.instance.addObserver(this);
}
#override
void dispose() {
// TODO: implement dispose
super.dispose();
WidgetsBinding.instance.removeObserver(this);
}
#override
void didChangeAppLifecycleState(AppLifecycleState appLifecycleState) {
// TODO: implement didChangeAppLifecycleState
super.didChangeAppLifecycleState(state);
state = appLifecycleState;
}
#override
Widget build(BuildContext context) {
return Scaffold(
body:Text("Progress Page"));
}}

Answer 1

In the login page dont use Navigator.push instead use Navigator.of(context).pushNamedAndRemoveUntil
The difference is Navigator.push will put login page as the first page so it will alway fall back to login page, after successful login you dont want that, you need to remove the login page from the routes stack, by using Navigator.of(context).pushNamedAndRemoveUntil, now when navigating between main and progress use Navigator.push
That will make the main page as the first route to fallbck to
Please read about it heare
https://api.flutter.dev/flutter/widgets/NavigatorState/pushAndRemoveUntil.html