i have a problem with Flutter BottomNavigationBar. i built a BottomNavigationBar with 3 items, the complete code is
class TabPage extends StatefulWidget {
#override
_TabPageState createState() => _TabPageState();
}
class _TabPageState extends State<TabPage> {
int _currentIndex = 0;
final Map<int, Widget> _routes = <int, Widget>{
0: MainTab(),
1: NotificationTab(),
2: BlocProvider(
create: (context) => ProfileBloc(DataProvider()),
child: ProfileTab(),
),
};
void _onTabTapped(int index) {
setState(() {
_currentIndex = index;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
bottomNavigationBar: BottomNavigationBar(
showUnselectedLabels: false,
currentIndex: _currentIndex,
type: BottomNavigationBarType.fixed,
onTap: _onTabTapped,
items: [
BottomNavigationBarItem(
icon: Icon(
Icons.language,
),
label: AppLocalizations.of(context).translate("home"),
),
BottomNavigationBarItem(
icon: Icon(
Icons.notifications,
),
label: AppLocalizations.of(context).translate("notification"),
),
BottomNavigationBarItem(
icon: Icon(
Icons.person,
),
label: AppLocalizations.of(context).translate("profile"),
)
],
),
body: _routes[_currentIndex],
);
}
}
Everything works fine if i switch from a tab to another, the problem is that the tab is not relodead if the user tap on the currently selected tab. The first tab is a widget with a WebView so i want the user returns to initialUrl even if he is already on that tab. It seems that tapping on the currently selected tab has no effect. Is there a way to rebuild the descendent widget?
class MainTab extends StatelessWidget {
#override
Widget build(BuildContext context) {
return SafeArea(
child: WebView(
initialUrl: "https://www.google.com/",
javascriptMode: JavascriptMode.unrestricted,
),
);
}
}
final Map<int, Widget> _routes = <int, Widget>{
0: MainTab(key : UniqueKey()), // add key to every widget and pass it to super constructor.
1: NotificationTab(key : UniqueKey()),
2: BlocProvider(
create: (context) => ProfileBloc(DataProvider()),
child: ProfileTab(key : UniqueKey()),
),
};
Related
I want to make this: https://medium.com/coding-with-flutter/flutter-case-study-multiple-navigators-with-bottomnavigationbar-90eb6caa6dbf. I'm working with Getx. First I have a screen called NavigatorPage, the controller is NavigatorController(). The problem is that in my HomePage() I use Get.toNamed('otheRoute') and I lose the Appbar and the BottomNavigationBar. I nedd to achieve the result as the link.
This is my navigator page
class NavigatorPage extends GetWidget<NavigatorController> {
NavigatorPage({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return Scaffold(
extendBodyBehindAppBar: true,
appBar: CustomAppBar(),
body: Obx(() => IndexedStack(
index: controller.tabIndex.value,
children: [
HomePage(),
//SecondPage(),
],
)),
bottomNavigationBar: Obx(() => BottomNavigationBar(
onTap: controller.changePage,
currentIndex: controller.tabIndex.value,
items: [
BottomNavigationBarItem(
icon: Icon(Icons.home),
label: 'home',
),
BottomNavigationBarItem(
icon: Icon(Icons.download),
label: 'download',
),
])),
);
}
}
This is my navigator controller
class NavigatorController extends GetxController {
var tabIndex = 0.obs;
changePage(int index) {
tabIndex(index);
print('Index: $tabIndex');
}
}
I am using BottomNavigationBar in Flutter, what I wanted is to navigate between pages by clicking on BottomNavigationBarItem normally. And at the same time, navigate to other pages but in the same BottomNavigationBarItem. let me explain more by this example that I found Here
Saying that my BottomNavigationBar has two BottomNavigationBarItem: Call, and Message. And Call can navigate (using a Elevatedbotton click for example) to Page1 and Page2, while Message can navigate (by Elevatedbotton click) to Page3 and page4.
Like this:
Call
-Page1
-Page2
Message
-Page3
-Page4
This solution solved 50% of my problem, what I can do now is to navigate from Callto page1 and page2 always with keeping BottomNavigationBar alive, now it still remains the second part, which is clicking on another BottomNavigationBarItem in order to navigate to Message
You try this way.
class App extends StatefulWidget {
// This widget is the root of your application.
#override
_AppState createState() => _AppState();
}
class _AppState extends State<App> {
int _selectedIndex = 0;
final GlobalKey<NavigatorState> _navigatorKey = GlobalKey<NavigatorState>();
Route<dynamic> generateRoute(RouteSettings settings) {
switch (settings.name) {
case 'Site':
return MaterialPageRoute(builder: (context) => SiteScreen());
default:
return MaterialPageRoute(builder: (context) => Home());
}
}
void _onItemTapped(int index) {
switch (index) {
case 1:
_navigatorKey.currentState!
.pushNamedAndRemoveUntil("Site", (route) => false);
break;
default:
_navigatorKey.currentState!
.pushNamedAndRemoveUntil("Home", (route) => false);
}
setState(() {
_selectedIndex = index;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Colors.black,
toolbarHeight: 0,
),
body: Navigator(key: _navigatorKey, onGenerateRoute: generateRoute),
bottomNavigationBar: BottomNavigationBar(
type: BottomNavigationBarType.fixed,
items: <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: Icon(Icons.home),
label: 'Home',
),
BottomNavigationBarItem(
icon: Icon(Icons.favorite_border),
label: 'Site',
),
],
showSelectedLabels: true,
showUnselectedLabels: false,
currentIndex: _selectedIndex,
selectedItemColor: Colors.white,
unselectedItemColor: Color(0xFF9e9e9e),
iconSize: 20,
backgroundColor: KBlackColor,
onTap: _onItemTapped,
),
);
}
}
class Home extends StatelessWidget{
#override
Widget build(BuildContext context) {
return Scaffold(
child: Column(children: [
TextButton(
onPressed: () {
MaterialPageRoute(builder: (context) => SubHome())
},
child: Text('Click'),
)
]),
);
}
}
class SubHome extends StatelessWidget{
#override
Widget build(BuildContext context) {
return Scaffold(
child: Column(children: [
Text('SubHome')
]),
);
}
}
I am trying to display the BottomNavigationBar on every View I have, it's working but this is a "dumb" way to do that...
I have a custom BottomNavigationBar which I am inserting in every View.
var selectedIndex = 0;
class CustomBottombar extends StatefulWidget {
CustomBottombar({Key key}) : super(key: key);
#override
_CustomBottombarState createState() => _CustomBottombarState();
}
class _CustomBottombarState extends State<CustomBottombar> {
List _viewList = [FirstView(), SecondView()];
#override
Widget build(BuildContext context) {
return BottomNavigationBar(
currentIndex: selectedIndex,
onTap: _onItemTapped,
items: _items,
);
}
void _onItemTapped(int index) {
setState(() {
selectedIndex = index;
Navigator.of(context).popUntil((route) => route.isFirst
);
Navigator.pushReplacement(
context,
MaterialPageRoute(builder: (context) => _viewList[index]),
);
});
}
final _items = [
BottomNavigationBarItem(
icon: Icon(
Icons.refresh,
color: Color(0xFFACACAC),
size: 35,
),
title: Text("first")),
BottomNavigationBarItem(
icon: Icon(
Icons.phone,
color: Color(0xFFACACAC),
size: 35,
),
title: Text("second"),
),
BottomNavigationBarItem(
icon: Icon(
Icons.add_shopping_cart,
color: Color(0xFFACACAC),
size: 35,
),
title: Text("thrid"),
),
];
}
in the _onItemTapped function I pop everything from the "Navigationstack" and then I am displaying the Screen that is in my Items.
in my FirstView() I have then this code
class FirstView extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: CustomAppBar(""),
bottomNavigationBar: CustomBottombar(),
endDrawer: CustomDrawer(),
body: Center(
child: RaisedButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => ContactView()),
);
},
child: Text('First'),
),
),
);
}
}
Now I want to move to "ContactView" which is not an Item in the BottomNavigationBar
class ContactState extends State<ContactView> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: CustomAppBar("title"),
endDrawer: CustomDrawer(),
bottomNavigationBar: CustomBottombar(),
body: SafeArea(
bottom: true,
child: SingleChildScrollView(
child: Container(child: Text("Contact"),),
)),
);
}
}
I'll also have a lot of other views which are not in the items array but I want to display the BottomNavigationBar on.
My Issue is really this function.
void _onItemTapped(int index) {
setState(() {
selectedIndex = index;
Navigator.of(context).popUntil((route) => route.isFirst
);
Navigator.pushReplacement(
context,
MaterialPageRoute(builder: (context) => _viewList[index]),
);
});
}
because here I'm deleting the navigation history to display the View which is in the Items Array.
Is there a standard way to do this, Hopefully, someone can help.
EDIT:
For clarification: I have like 10 Screens. Only 3 of those are navigatiable via BottomNavigationBar, Let's say the first 3 of those 10. now I want to Navigate to Screen4 from Screen1. The navigationbar disappears on screen4. I want Want to keep the Navigationbar on all Screens.
Edit 2
#Dhaval Kansara answer worked for me but I got a new Problem.
I have an enddrawer, before the fix it was above the BottomNavigationBar now the BottomNavigationBar is above.
but I want it like this
Use CupertinoTabBar as shown below for the static BottomNavigationBar.
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:mqttdemo/Screen2.dart';
import 'package:mqttdemo/Screen3.dart';
import 'Screen1.dart';
class Home extends StatefulWidget {
#override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<Home> {
int _currentIndex;
List<Widget> _children;
#override
void initState() {
_currentIndex = 0;
_children = [
Screen1(),
Screen2(),
Screen3(),
];
super.initState();
}
#override
Widget build(BuildContext context) {
return CupertinoTabScaffold(
tabBar: CupertinoTabBar(
currentIndex: _currentIndex,
onTap: onTabTapped,
items: [
BottomNavigationBarItem(
icon: Icon(Icons.home),
title: Text("Screen 1"),
),
BottomNavigationBarItem(
icon: Icon(Icons.home),
title: Text("Screen 2"),
),
BottomNavigationBarItem(
icon: Icon(Icons.home), title: Text("Screen 3")),
],
),
tabBuilder: (BuildContext context, int index) {
return CupertinoTabView(
builder: (BuildContext context) {
return SafeArea(
top: false,
bottom: false,
child: CupertinoApp(
home: CupertinoPageScaffold(
resizeToAvoidBottomInset: false,
child: _children[_currentIndex],
),
),
);
},
);
}
);
}
void onTabTapped(int index) {
setState(() {
_currentIndex = index;
});
}
}
Navigate to screen4 from Screen3 as shown below:
class Screen3 extends StatefulWidget {
#override
_Screen3State createState() => _Screen3State();
}
class _Screen3State extends State<Screen3> {
#override
Widget build(BuildContext context) {
return Container(
color: Colors.black,
child: Center(
child: RaisedButton(
child: Text("Click me"),
onPressed: () {
Navigator.of(context, rootNavigator: false).push(MaterialPageRoute(
builder: (context) => Screen4(), maintainState: false));
},
),
),
);
}
}
I have a BottomNavigationBar that navigates to other pages when pressing an icon. This works fine, except the value of the currentIndex property in BottomNavigationBar doesn't update when the state updates, which means there is no change on the acual BottomNavigationBar. enter image description here
I'm using a vaiable (_selectedPage) to keep track of the selected index in the BottomNavigationBar, and the value changes when tapping an item, but it's not updating the currentIndex property when the state updates.. why is that?
import 'package:flutter/material.dart';
import 'package:independentproject/pages/home_page.dart';
import 'package:independentproject/pages/cook_recipe.dart';
class PageNavigationBar extends StatefulWidget {
#override
_PageNavigationBarState createState() => _PageNavigationBarState();
}
class _PageNavigationBarState extends State<PageNavigationBar> {
//default page showing in bottom navigation bar will be CookRecipe()
int _selectedPage = 1;
//all pages optional in bottom navigation bar
final List<Widget> _pageOptions = [
HomePage(),
CookRecipe(),
];
void onTapped(int pageTapped) {
setState(() {
//print(pageTapped);
_selectedPage = pageTapped;
Navigator.push(context, MaterialPageRoute(builder: (context) => _pageOptions[pageTapped]));
//print(_selectedPage);
});
}
#override
Widget build(BuildContext context) {
return BottomNavigationBar(
//TODO: currentIndex: doesn't update when the state updates, why?
currentIndex: _selectedPage,
//items showing in bottom navigation bar
items: [
BottomNavigationBarItem(
icon: Icon(Icons.home),
title: Text('Homepage'),
),
BottomNavigationBarItem(
icon: Icon(Icons.search),
title: Text('Search recipe'),
),
],
onTap: (int pageTapped) {
onTapped(pageTapped);
},
);
}
}
import 'package:flutter/material.dart';
import 'package:independentproject/page_navigation_bar.dart';
class HomePage extends StatefulWidget {
#override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('Home page'),
),
body: Center(
child: Text('Home page'),
),
bottomNavigationBar: PageNavigationBar(),
),
);
}
}
import 'package:flutter/material.dart';
import 'package:independentproject/page_navigation_bar.dart';
class CookRecipe extends StatefulWidget {
#override
_CookRecipeState createState() => _CookRecipeState();
}
class _CookRecipeState extends State<CookRecipe> {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('Search recipe'),
),
body: Center(
child: Text('Search recipes'),
),
bottomNavigationBar: PageNavigationBar(),
),
);
}
}
I would advise you to create a widget that will contain the BottomNavigationBar and also PageView that would allow you to switch pages with PageController.
For example:
class _MainScreenState extends State<MainScreen> {
PageController _pageController;
int _page = 1;
Duration pageChanging = Duration(milliseconds: 300);//this is for page animation-not necessary
Curve animationCurve = Curves.linear;//this is for page animation-not necessary
_MainScreenState();
#override
void initState() {
super.initState();
_pageController = PageController(initialPage: 1);
}
Widget build(BuildContext context) {
return Scaffold(
body: PageView(
physics: BouncingScrollPhysics(),
scrollDirection: Axis.horizontal,
controller: _pageController,
onPageChanged: onPageChanged,
children: <Widget>[
//here are all the pages you need:
//CookRecipe(),
],
),
bottomNavigationBar: BottomNavigationBar(
type: BottomNavigationBarType.fixed,
items: <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: Icon(
Icons.message,
),
title: Container(height: 0.0),
),
BottomNavigationBarItem(
icon: Icon(
Icons.home,
),
title: Container(height: 0.0),
),
BottomNavigationBarItem(
icon: Icon(
Icons.person,
),
title: Container(height: 0.0),
),
],
onTap: navigationTapped,
selectedItemColor: Theme.of(context).backgroundColor,
currentIndex: _page,
),
),
);
}
void navigationTapped(int page) {
_pageController.animateToPage(page,duration: pageChanging,
curve: animationCurve,);
}
#override
void dispose() {
super.dispose();
_pageController.dispose();
}
void onPageChanged(int page) {
if (this.mounted){
setState(() {
this._page = page;
});
}}
You can also do this without the PageView,and use only the controller to switch pages.
BTW-you create new instance of the navigation bar when you load a page which is bad practice
it is because PageNavigationBar is a own class, when you call there a setstate only this class updates
take a look at the Provider
a very usefull state management Package
or you can also handle your Page, when the NavBar is your Main Page and you have only one Page
return MaterialApp(
home: Scaffold(
appBar: ownAppBar(_selectedPage),
body: _bodyOptions[_selectedPage],
bottomNavigationBar: BottomNavigationBar(
currentIndex: _selectedPage,
items: [
BottomNavigationBarItem(
icon: Icon(Icons.home),
title: Text('Homepage'),
),
BottomNavigationBarItem(
icon: Icon(Icons.search),
title: Text('Search recipe'),
),
],
onTap: (int pageTapped) {
onTapped(pageTapped);
},
)
),
);
final List<Widget> _bodyOptions = [
HomePage(),
CookRecipe(),
];
You don't need to use Navigator to change pages, I modified your code just try.
import 'package:flutter/material.dart';
main() {
runApp(MaterialApp(home: PageNavigationBar()));
}
class PageNavigationBar extends StatefulWidget {
#override
_PageNavigationBarState createState() => _PageNavigationBarState();
}
class _PageNavigationBarState extends State<PageNavigationBar> {
//default page showing in bottom navigation bar will be CookRecipe()
int _selectedPage = 1;
//all pages optional in bottom navigation bar
final List<Widget> _pageOptions = [
HomePage(),
CookRecipe(),
];
void onTapped(int pageTapped) {
setState(() {
//print(pageTapped);
_selectedPage = pageTapped;
// Navigator.push(context, MaterialPageRoute(builder: (context) => _pageOptions[pageTapped]));
//print(_selectedPage);
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: _pageOptions[_selectedPage],
bottomNavigationBar: BottomNavigationBar(
//TODO: currentIndex: doesn't update when the state updates, why?
currentIndex: _selectedPage,
//items showing in bottom navigation bar
items: [
BottomNavigationBarItem(
icon: Icon(Icons.home),
title: Text('Homepage'),
),
BottomNavigationBarItem(
icon: Icon(Icons.search),
title: Text('Search recipe'),
),
],
onTap: (int pageTapped) {
onTapped(pageTapped);
},
),
);
}
}
class CookRecipe extends StatefulWidget {
#override
_CookRecipeState createState() => _CookRecipeState();
}
class _CookRecipeState extends State<CookRecipe> {
#override
Widget build(BuildContext context) {
return Center(
child: Text('Search recipes'),
);
}
}
class HomePage extends StatefulWidget {
#override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
#override
Widget build(BuildContext context) {
return Center(
child: Text('Home page'),
);
}
}
The Flutter Gallery example of BottomNavigationBar uses a Stack of FadeTransitions in the body of the Scaffold.
I feel it would be cleaner (and easier to animate) if we could switch pages by using a Navigator.
Are there any examples of this?
int index = 0;
#override
Widget build(BuildContext context) {
return new Scaffold(
body: new Stack(
children: <Widget>[
new Offstage(
offstage: index != 0,
child: new TickerMode(
enabled: index == 0,
child: new MaterialApp(home: new YourLeftPage()),
),
),
new Offstage(
offstage: index != 1,
child: new TickerMode(
enabled: index == 1,
child: new MaterialApp(home: new YourRightPage()),
),
),
],
),
bottomNavigationBar: new BottomNavigationBar(
currentIndex: index,
onTap: (int index) { setState((){ this.index = index; }); },
items: <BottomNavigationBarItem>[
new BottomNavigationBarItem(
icon: new Icon(Icons.home),
title: new Text("Left"),
),
new BottomNavigationBarItem(
icon: new Icon(Icons.search),
title: new Text("Right"),
),
],
),
);
}
You should keep each page by Stack to keep their state.
Offstage stops painting, TickerMode stops animation.
MaterialApp includes Navigator.
Output:
Code:
int _index = 0;
#override
Widget build(BuildContext context) {
Widget child;
switch (_index) {
case 0:
child = FlutterLogo();
break;
case 1:
child = FlutterLogo(colors: Colors.orange);
break;
case 2:
child = FlutterLogo(colors: Colors.red);
break;
}
return Scaffold(
body: SizedBox.expand(child: child),
bottomNavigationBar: BottomNavigationBar(
onTap: (newIndex) => setState(() => _index = newIndex),
currentIndex: _index,
items: [
BottomNavigationBarItem(icon: Icon(Icons.looks_one), title: Text("Blue")),
BottomNavigationBarItem(icon: Icon(Icons.looks_two), title: Text("Orange")),
BottomNavigationBarItem(icon: Icon(Icons.looks_3), title: Text("Red")),
],
),
);
}
Here is an example how you can use Navigator with BottomNavigationBar to navigate different screen.
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
// This navigator state will be used to navigate different pages
final GlobalKey<NavigatorState> _navigatorKey = GlobalKey<NavigatorState>();
int _currentTabIndex = 0;
#override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
body: Navigator(key: _navigatorKey, onGenerateRoute: generateRoute),
bottomNavigationBar: _bottomNavigationBar(),
),
);
}
Widget _bottomNavigationBar() {
return BottomNavigationBar(
type: BottomNavigationBarType.fixed,
items: [
BottomNavigationBarItem(
icon: Icon(Icons.home),
title: Text("Home"),
),
BottomNavigationBarItem(
icon: Icon(Icons.account_circle), title: Text("Account")),
BottomNavigationBarItem(
icon: Icon(Icons.settings),
title: Text("Settings"),
)
],
onTap: _onTap,
currentIndex: _currentTabIndex,
);
}
_onTap(int tabIndex) {
switch (tabIndex) {
case 0:
_navigatorKey.currentState.pushReplacementNamed("Home");
break;
case 1:
_navigatorKey.currentState.pushReplacementNamed("Account");
break;
case 2:
_navigatorKey.currentState.pushReplacementNamed("Settings");
break;
}
setState(() {
_currentTabIndex = tabIndex;
});
}
Route<dynamic> generateRoute(RouteSettings settings) {
switch (settings.name) {
case "Account":
return MaterialPageRoute(builder: (context) => Container(color: Colors.blue,child: Center(child: Text("Account"))));
case "Settings":
return MaterialPageRoute(builder: (context) => Container(color: Colors.green,child: Center(child: Text("Settings"))));
default:
return MaterialPageRoute(builder: (context) => Container(color: Colors.white,child: Center(child: Text("Home"))));
}
}
}
Here is example:
int _currentIndex = 0;
Route<Null> _getRoute(RouteSettings settings) {
final initialSettings = new RouteSettings(
name: settings.name,
isInitialRoute: true);
return new MaterialPageRoute<Null>(
settings: initialSettings,
builder: (context) =>
new Scaffold(
body: new Center(
child: new Container(
height: 200.0,
width: 200.0,
child: new Column(children: <Widget>[
new Text(settings.name),
new FlatButton(onPressed: () =>
Navigator.of(context).pushNamed(
"${settings.name}/next"), child: new Text("push")),
],
))
),
bottomNavigationBar: new BottomNavigationBar(
currentIndex: _currentIndex,
onTap: (value) {
final routes = ["/list", "/map"];
_currentIndex = value;
Navigator.of(context).pushNamedAndRemoveUntil(
routes[value], (route) => false);
},
items: [
new BottomNavigationBarItem(
icon: new Icon(Icons.list), title: new Text("List")),
new BottomNavigationBarItem(
icon: new Icon(Icons.map), title: new Text("Map")),
]),
));
}
#override
Widget build(BuildContext context) =>
new MaterialApp(
initialRoute: "/list",
onGenerateRoute: _getRoute,
theme: new ThemeData(
primarySwatch: Colors.blue,
),
);
You can set isInitialRoute to true and pass it to MaterialPageRoute. It will remove pop animation.
And to remove old routes you can use pushNamedAndRemoveUntil
Navigator.of(context).pushNamedAndRemoveUntil(routes[value], (route) => false);
To set current page you can have a variable in your state _currentIndex and assign it to BottomNavigationBar:
Glad You asked, I experimented with this a couple of months back and tried to simplify this through a blog post. I won't be able to post the complete code here since it is pretty long, But I can certainly link all the resources to clarify it.
Everything about the BottomNavigationBar in flutter
complete sample code
Dartpad demo
If you prefer you can also depend on this package https://pub.dev/packages/navbar_router
Here's the resulting output of what the article helps you build
Navigator.of(context).pushNamedAndRemoveUntil(
routes[value], (route) => true);
I had to use true to enable back button.
NB: I was using Navigator.pushNamed() for navigation.
This is the code I am using in my project. If you try to avoid page viewer so you can try this
import 'package:flutter/material.dart';
class Dashboard extends StatefulWidget {
const Dashboard({Key? key}) : super(key: key);
#override
State<Dashboard> createState() => _DashboardState();
}
class _DashboardState extends State<Dashboard> {
int _selectedIndex = 0;
void _onItemTapped(int index) {
setState(() {
_selectedIndex = index;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Sample'),
),
body: SingleChildScrollView(
child: Column(
children: [
if (_selectedIndex == 0)
// you can call custom widget here
Column(
children: const [
Text("0"),
],
)
else if (_selectedIndex == 1)
Column(
children: const [
Text("1"),
],
)
else
Column(
children: const [
Text("2"),
],
),
],
),
),
bottomNavigationBar: BottomNavigationBar(
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: Icon(Icons.headphones),
label: 'Home',
),
BottomNavigationBarItem(
icon: Icon(Icons.business),
label: 'Business',
),
BottomNavigationBarItem(
icon: Icon(Icons.school),
label: 'School',
),
],
currentIndex: _selectedIndex,
selectedItemColor: Colors.amber[800],
unselectedItemColor: Colors.grey,
onTap: _onItemTapped,
),
);
}
}
Happy Coding