MaterialPageRoute goes to a new page without the appbar using it with bottomNavigationBar - flutter

Question

I have an app with three routes and uses the bottomNavigationBar to navigate between them. In one of the routes I have a button in the page that will also navigate to one of the pages.
Heres my main page
import 'package:flutter/material.dart';
import 'page_two.dart';
import 'page_three.dart';
void main() {
return runApp(MyApp());
}
/// This Widget is the main application widget.
class MyApp extends StatelessWidget {
static const String _title = 'Flutter Code Sample';
#override
Widget build(BuildContext context) {
return MaterialApp(
title: _title,
home: MyStatefulWidget(),
);
}
}
class MyStatefulWidget extends StatefulWidget {
MyStatefulWidget({Key key}) : super(key: key);
#override
_MyStatefulWidgetState createState() => _MyStatefulWidgetState();
}
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
int _selectedIndex = 0;
List<Widget> _widgetOptions = <Widget>[
Text('Main'),
PageTwo(),
PageThree(),
];
void _onItemTapped(int index) {
setState(() {
_selectedIndex = index;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('BottomNavigationBar Sample'),
),
body: Center(
child: _widgetOptions.elementAt(_selectedIndex),
),
bottomNavigationBar: BottomNavigationBar(
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: Icon(Icons.home, color: Colors.black),
title: Text('Home'),
),
BottomNavigationBarItem(
icon: Icon(Icons.business, color: Colors.black),
title: Text('Business'),
),
BottomNavigationBarItem(
icon: Icon(Icons.business, color: Colors.black),
title: Text('Business'),
),
],
currentIndex: _selectedIndex,
selectedItemColor: Colors.amber[800],
onTap: _onItemTapped,
),
);
}
}
Page Two
import 'package:flutter/material.dart';
import 'main.dart';
class PageTwo extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Container(
child: RaisedButton(
child: Text('Go page 1'),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => MyApp()),
);
},
),
);
}
}
and Page Three with a button that navigates to page two
import 'package:flutter/material.dart';
import 'page_two.dart';
class PageThree extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Container(
child: RaisedButton(
child: Text('Go page 1'),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => PageTwo()),
);
},
),
);
}
}
When I press the button on Page Three, it will go to Page Two without the AppBar and the BottomNavigationBar

Answer 1

Use GlobalKey and In PageTwo Widget call MyStatefulWidgetState's _onItemTapped function
You can see working demo and full code below
code snippet
final scakey = new GlobalKey<_MyStatefulWidgetState>();
...
child: Text('Go page 2'),
onPressed: () {
scakey.currentState._onItemTapped(1);
full code
import 'package:flutter/material.dart';
void main() {
return runApp(MyApp());
}
final scakey = new GlobalKey<_MyStatefulWidgetState>();
/// This Widget is the main application widget.
class MyApp extends StatelessWidget {
static const String _title = 'Flutter Code Sample';
#override
Widget build(BuildContext context) {
return MaterialApp(
title: _title,
home: MyStatefulWidget(key: scakey),
);
}
}
class MyStatefulWidget extends StatefulWidget {
MyStatefulWidget({Key key}) : super(key: key);
#override
_MyStatefulWidgetState createState() => _MyStatefulWidgetState();
}
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
int _selectedIndex = 0;
final myKey = new GlobalKey<_MyStatefulWidgetState>();
List<Widget> _widgetOptions = <Widget>[
Text('Main'),
PageTwo(),
PageThree(),
];
void _onItemTapped(int index) {
setState(() {
_selectedIndex = index;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
key: myKey,
appBar: AppBar(
title: const Text('BottomNavigationBar Sample'),
),
body: Center(
child: _widgetOptions.elementAt(_selectedIndex),
),
bottomNavigationBar: BottomNavigationBar(
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: Icon(Icons.home, color: Colors.black),
title: Text('Home'),
),
BottomNavigationBarItem(
icon: Icon(Icons.business, color: Colors.black),
title: Text('Business'),
),
BottomNavigationBarItem(
icon: Icon(Icons.business, color: Colors.black),
title: Text('Business'),
),
],
currentIndex: _selectedIndex,
selectedItemColor: Colors.amber[800],
onTap: _onItemTapped,
),
);
}
}
class PageTwo extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Container(
child: RaisedButton(
child: Text('Go page 1'),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => MyApp()),
);
},
),
);
}
}
class PageThree extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Container(
child: RaisedButton(
child: Text('Go page 2'),
onPressed: () {
scakey.currentState._onItemTapped(1);
/*Navigator.push(
context,
MaterialPageRoute(builder: (context) => PageTwo()),
);*/
},
),
);
}
}

Answer 2

When using navigation bar to navigate between pages, you are tapping on BottomNavigationBarItem to change the index by calling setState() and as the result, build method is triggered with a new _selectedIndex and that index is used to render your appropriate widget.
_widgetOptions.elementAt(_selectedIndex)
Navigator.push on the other hand is just pushing a new route on top of the navigation stack. You are not getting an AppBar or BottomNavigationBar since you don't have them on PageTwo. What I would recommend you is to create a callback function in PageTwo and call that function on button tap. You can now use that callback in MyStatefulWidget to change the index with setState. Here is an example
Declare a final like below in your pages.
final void Function(int index) pageChanged;
In the onTap event of your button, call this function.
widget.pageChanged(1); // PageTwo
In MyStatefulWidget, when you are creating pages, pass the function.
PageTwo(pageChanged:(index){
setState(){_selectedIndex = index;}
});