How to save index of PageView? - flutter

Question

I have a PageView to show 4 pages and a BottomNavigationBar to switch them. I'm having troubles with the PageController.
In any page, I navigate to a new Screen, but when get back, the PageView return to the initial page and no to the last page.
Here is how I using the PageView
#override
void initState() {
super.initState();
_page = 0;
_pageController = PageController(keepPage: true);
}
return Scaffold(
appBar: AppBar(
title: getAppBarTitle(_page),
centerTitle: true,
actions: renderActions(_page)),
body: PageView(
children: <Widget>[
DashboardScreen(),
InstructionsScreen(),
CatalogScreen(),
ProfileScreen()
],
controller: _pageController,
onPageChanged: onPageChanged,
physics: NeverScrollableScrollPhysics()),
bottomNavigationBar: BottomNavigationBar(
key: bottomNavigationBar,
type: BottomNavigationBarType.shifting,
onTap: navigationTapped,
currentIndex: _page,
items: [
BottomNavigationBarItem(
icon: Icon(Icons.home, color: Colors.grey),
activeIcon:
Icon(Icons.home, color: Theme.of(context).primaryColor),
title: Text('Dashboard',
style: TextStyle(color: Theme.of(context).primaryColor)),
backgroundColor: Colors.white),
BottomNavigationBarItem(
icon: Icon(Icons.receipt, color: Colors.grey),
activeIcon:
Icon(Icons.receipt, color: Theme.of(context).primaryColor),
title: Text('Instructions',
style: TextStyle(color: Theme.of(context).primaryColor)),
backgroundColor: Colors.white),
BottomNavigationBarItem(
icon: Icon(Icons.dashboard, color: Colors.grey),
activeIcon:
Icon(Icons.dashboard, color: Theme.of(context).primaryColor),
title: Text('Catalog',
style: TextStyle(color: Theme.of(context).primaryColor)),
backgroundColor: Colors.white),
BottomNavigationBarItem(
icon: Icon(Icons.person, color: Colors.grey),
activeIcon:
Icon(Icons.person, color: Theme.of(context).primaryColor),
title: Text('Profile',
style: TextStyle(color: Theme.of(context).primaryColor)),
backgroundColor: Colors.white)
],
),
);
void navigationTapped(int page) {
_pageController.animateToPage(page,
duration: const Duration(milliseconds: 300), curve: Curves.ease);
}
void onPageChanged(int page) {
setState(() {
this._page = page;
});
}
In the DashboardScreen for example, I go to a new page like:
Navigator.of(context)
.push(MaterialPageRoute(builder: (context) => CodeScreen()))
How can I fix this? I need to use Redux or Bloc to achieve this?
Thanks.