how to stop navigator to reload view? - flutter

Question

I'm new to flutter and have a question about navigator.
I have 2 views one called Home and List. I created a drawer that is persistent in these two views. In each view I'm creating a reference to Firebase using FutureBuilder. The problem I'm running into is that every time I go to either Home or List initState is being called again. I believe the problem comes from selecting the page from the drawer. My question How can I still move to different pages without having to called InitState everytime I change screens.
title: Text('Go to page 1'),
onTap: () {
Navigator.of(context)
.push(MaterialPageRoute(builder: (context) => Listdb()));
This is where I think the screen rebuilds itself. Is there a way to avoid rebuilding?
Thank you for your help!

Answer 1

You can use the AutomaticKeepAliveClientMixin to prevent reloading everytime you change page, combining with PageView for better navigation. I'll included an example here:
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final PageController _pageController = PageController();
Widget build(BuildContext context) {
return Scaffold(
drawer: Drawer(
child: ListView(
padding: EdgeInsets.zero,
children: <Widget>[
DrawerHeader(
child: Text('Drawer Header'),
decoration: BoxDecoration(
color: Colors.blue,
),
),
ListTile(
title: Text('Item 1'),
onTap: () {
_pageController.jumpToPage(0);
Navigator.pop(context);
},
),
ListTile(
title: Text('Item 2'),
onTap: () {
_pageController.jumpToPage(1);
Navigator.pop(context);
},
),
],
),
),
body: PageView(
controller: _pageController,
children: <Widget>[
PageOne(),
PageTwo(),
],
),
);
}
}
class PageOne extends StatefulWidget {
#override
_PageOneState createState() => _PageOneState();
}
class _PageOneState extends State<PageOne> with AutomaticKeepAliveClientMixin {
#override
void initState() {
print("From PageOne - This will only print once");
super.initState();
}
#override
bool get wantKeepAlive => true;
#override
Widget build(BuildContext context) {
super.build(context);
return Scaffold(
backgroundColor: Colors.red,
);
}
}
class PageTwo extends StatefulWidget {
#override
_PageTwoState createState() => _PageTwoState();
}
class _PageTwoState extends State<PageTwo> with AutomaticKeepAliveClientMixin {
#override
void initState() {
print("From PageTwo - This will only print once");
super.initState();
}
#override
bool get wantKeepAlive => true;
#override
Widget build(BuildContext context) {
super.build(context);
return Scaffold(
backgroundColor: Colors.blue,
);
}
}