Navigation at the top with active icons? - flutter

Firstly I used AppBar to change pages, but I noticed BottomNavBar has better properties to do that. But it would be great if someone gave me a clue to create navigation at the top of the screen.
This BottomNavBar doesn't work, gives error 'each child must be laid once':
Widget build(BuildContext context) {
return new Scaffold(
//appBar: bar(context),
body: new Container(
key: _formKey,
padding: const EdgeInsets.all(30),
child: new Column(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Positioned(
bottom: 0.0,
left: 0.0,
right: 0.0,
child: BottomNavigationBar(
items: <BottomNavigationBarItem>[
new BottomNavigationBarItem(
icon: const Icon(Icons.home), title: new Text("Home")),
new BottomNavigationBarItem(
icon: const Icon(Icons.work),
title: new Text("Self Help")),
new BottomNavigationBarItem(
icon: const Icon(Icons.face),
title: new Text("Profile"))
],
selectedItemColor: colorGold,
)),
],
),
),
);
}
}
And this is my AppBar where I tried to change color of the active icon:
AppBar(
automaticallyImplyLeading: false,
title: Center(
child: Row(mainAxisAlignment: MainAxisAlignment.center, children: <
Widget>[
iconButton(
Icons.home,
),
iconButton(
Icons.work,
),
iconButton(
Icons.face,
)),]))```

If I'm not wrong , you are supposing to this:
Use PreferredSize widget in your app bar
Full code:
class TabBarHomeScreen extends StatefulWidget {
#override
_TabBarHomeScreenState createState() => _TabBarHomeScreenState();
}
class _TabBarHomeScreenState extends State<TabBarHomeScreen> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Top Navigation tab bar demo"),
),
body: TopNavigationBar(),
);
}
}
class TopNavigationBar extends StatefulWidget {
#override
_TopNavigationBarState createState() => _TopNavigationBarState();
}
class _TopNavigationBarState extends State<TopNavigationBar> with SingleTickerProviderStateMixin {
int tabIndex = 0;
#override
Widget build(BuildContext context) {
return Scaffold(
appBar:PreferredSize(
preferredSize: Size.fromHeight(kToolbarHeight),
child: BottomNavigationBar(
//elevation: 0.0,
items: <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: Icon(Icons.home, color: Colors.grey,),
activeIcon: Icon(Icons.home, color: Colors.blue,),
title: Text('')
),
BottomNavigationBarItem(
icon: Icon(Icons.mail, color: Colors.grey,),
activeIcon: Icon(Icons.mail, color: Colors.blue,),
title: Text('')
),
BottomNavigationBarItem(
icon: Icon(Icons.account_circle, color: Colors.grey,),
activeIcon: Icon(Icons.account_circle, color: Colors.blue,),
title: Text('')
)
],
currentIndex: tabIndex,
selectedItemColor: Colors.blueAccent,
onTap: (int index){
setState(() {
tabIndex = index;
});
},
),
),
body: Container(
color: Colors.white,
child: tabIndex ==0 ?MyHomeScreen()
:tabIndex == 1? MyMailScreen(): MyProfileScreen()
),
);
}
}
class MyHomeScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child:Text("My Home Screen")
),
);
}
}
class MyMailScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child:Text("My Mail Screen")
),
);
}
}
class MyProfileScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child:Text("My Profile Screen")
),
);
}
}

Related

Change appBar in for each button clicked in flutter

Is there any way that I can change AppBar's 'title:' that will be based to my BottomNavigationBar's button label? I am building an app where the navigation bar will call each classes' on button click,
Like this maybe?
appbar: AppBar(
title: SelectedIndex(label/tile),
),
Here's the source code:
import 'package:flutter/material.dart';
import 'BoosterCommunity_Page.dart';
import 'Diary_Page.dart';
import 'GradeTracker_Page.dart';
import 'CalendarView_Page.dart';
import 'QuotesPage.dart';
import 'ListView_Page.dart';
class HomePage extends StatefulWidget {
HomePage({Key? key}): super(key: key);
#override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
PageController _pageController = PageController();
List<Widget> _screens = [
QuotesPage(), ListViewPage(), CalendarViewPage(), GradeTrackerPage(), DiaryPage(), BoosterCommunityPage(),
];
void _onPageChanged(int index) {}
void _onItemsTapped(int selectedIndex) {
_pageController.jumpToPage(selectedIndex);
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
centerTitle: true,
//I want it to be implemented in this line
title: (BottomNavBar selected index title or label),
),
body: PageView(
controller: _pageController,
children: _screens,
onPageChanged: _onPageChanged,
physics: NeverScrollableScrollPhysics(),
),
bottomNavigationBar: BottomNavigationBar(
onTap: _onItemsTapped,
items: [
BottomNavigationBarItem(
icon: Icon(Icons.home, color: Colors.grey,),
label: 'Home',
),
BottomNavigationBarItem(
icon: Icon(Icons.list, color: Colors.grey,),
label: 'Task List',
),
BottomNavigationBarItem(
icon: Icon(Icons.calendar_view_month, color: Colors.grey,),
label: 'Calendar View',
),
BottomNavigationBarItem(
icon: Icon(Icons.grade, color: Colors.grey,),
label: 'Grade Tracker',
),
BottomNavigationBarItem(
icon: Icon(Icons.book, color: Colors.grey,),
label: 'Diary Page',
),
BottomNavigationBarItem(
icon: Icon(Icons.business, color: Colors.grey,),
label: 'Booster Community',
),
],
),
drawer: Drawer(
child: ListView(
padding: EdgeInsets.zero,
children: [
Container(
height: 100.0,
child: const DrawerHeader(
decoration: BoxDecoration(
color: Colors.orange,
),
child: Text('Sign in first'),
),
),
ListTile(
title: const Text('Account'),
onTap: () {
Navigator.pop(context);
},
),
ListTile(
title: const Text('Settings'),
onTap: () {
Navigator.pop(context);
},
),
ListTile(
title: const Text('Help and Support'),
onTap: (){
Navigator.pop(context);
},
),
],
),
),
);
}
}
Is it possible or is there an easy way? please let me know, thank you in advance.
Try this one, here I use currentPage to hold the index of the selected bottom navigation item and pageTitle to show the title on the app bar. Now whenever the user tap on the item in the bottom bar all you have to do is to update currentIndex and pageTitle by fetching the specific key at the index in the map bottomNavigateData.
import 'package:flutter/material.dart';
void main() =>
runApp(MaterialApp(debugShowCheckedModeBanner: false, home:
HomePage()));
class HomePage extends StatefulWidget {
#override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
static int currentPage = 0;
static Map<String, Icon> bottomNavigateData = {
'Home': const Icon(
Icons.home,
color: Colors.grey,
),
'Task List': const Icon(
Icons.list,
color: Colors.grey,
),
};
String pageTitle = bottomNavigateData.keys.first;
final PageController _pageController = PageController();
final List<Widget> _screens = [
QuotesPage(),
ListViewPage(),
];
void _onPageChanged(int index) {}
void _onItemsTapped(int selectedIndex) {
setState(() {
currentPage = selectedIndex;
pageTitle = bottomNavigateData.keys.elementAt(selectedIndex);
});
_pageController.jumpToPage(selectedIndex);
}
#override
Widget build(BuildContext context) {
List<BottomNavigationBarItem> navigations = [];
bottomNavigateData
.forEach((k, v) => navigations.add(BottomNavigationBarItem(
icon: v,
label: k,
)));
return Scaffold(
appBar: AppBar(
centerTitle: true,
title: Text(pageTitle),
),
body: PageView(
controller: _pageController,
children: _screens,
onPageChanged: _onPageChanged,
physics: const NeverScrollableScrollPhysics(),
),
bottomNavigationBar: BottomNavigationBar(
currentIndex: currentPage, onTap: _onItemsTapped, items: navigations),
drawer: Drawer(
child: ListView(
padding: EdgeInsets.zero,
children: [
Container(
height: 100.0,
child: const DrawerHeader(
decoration: BoxDecoration(
color: Colors.orange,
),
child: Text('Sign in first'),
),
),
ListTile(
title: const Text('Account'),
onTap: () {
Navigator.pop(context);
},
),
ListTile(
title: const Text('Settings'),
onTap: () {
Navigator.pop(context);
},
),
ListTile(
title: const Text('Help and Support'),
onTap: () {
Navigator.pop(context);
},
),
],
),
),
);
}
}
Widget QuotesPage() {
return Container(color: Colors.white, child: const Text("Page1"));
}
Widget ListViewPage() {
return Container(color: Colors.white, child: const Text("Page2"));
}
Yes, easily. Just define your NavigationBarItems in a variable, update selection index in onTap with setState, and set appBar title based on selection. Something like this:
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const HomePage(),
);
}
}
class HomePage extends StatefulWidget {
const HomePage({Key? key}) : super(key: key);
#override
State<HomePage> createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
int _currentIndex = 0;
static const _navigationBarItems = <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: Icon(Icons.home),
label: 'Home',
),
BottomNavigationBarItem(
icon: Icon(Icons.message),
label: 'Message',
),
BottomNavigationBarItem(
icon: Icon(Icons.person),
label: 'Person',
),
];
static const List<Widget> _pages = <Widget>[
Text('home'),
Text('message'),
Text('person'),
];
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(_navigationBarItems[_currentIndex].label!),
),
body: Center(
child: _pages.elementAt(_currentIndex),
),
bottomNavigationBar: BottomNavigationBar(
items: _navigationBarItems,
currentIndex: _currentIndex,
selectedItemColor: Colors.amber[800],
onTap: (int index) {
setState(() {
_currentIndex = index;
});
},
),
);
}
}

Flutter - How do i access the Drawer from a nested Scaffold

This parent Bottom Navigation bar
import 'package:flutter/material.dart';
class BottomNavigation extends StatefulWidget {
BottomNavigation({
Key? key,
}) : super(key: key);
#override
_BottomNavigationState createState() => _BottomNavigationState();
}
class _BottomNavigationState extends State<OARBottomNavigation> {
int _selectedIndex = 0;
List<Widget> _widgetOptions = [
Screen1(),
Screen2(),
];
void _onItemTapped(int index) {
setState(() {
_selectedIndex = index;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
drawer: SideDrawer(),
bottomNavigationBar: BottomNavigationBar(
type: BottomNavigationBarType.fixed,
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: Icon(Icons.assignment_turned_in),
label: 'Screen 1',
),
BottomNavigationBarItem(
icon: Icon(Icons.people),
label: 'Screen 2',
),
],
currentIndex: _selectedIndex,
onTap: _onItemTapped,
),
body: Scaffold(
body: _widgetOptions.elementAt(_selectedIndex),
),
);
}
}
Now on Screen 1 I want to open the Drawer().
import 'package:flutter/material.dart';
class Screen1 extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Screen 1 Title'),
),
body: Container(
child: Text('This is Screen 1'),
),
),
);
}
}
How can I open the Drawer from Screen 1?
Please check the following code. There are BottomNavigationBar and Drawer(top of the BottomNavigationBar)
return Scaffold(
appBar: AppBar(),
drawer: Drawer(
child: Container(
color: Colors.red,
child: ListView.builder(
itemBuilder: (context, index) {
return ListTile(
title: InkWell(
onTap: () {},
child: Text(
index.toString(),
),
),
);
},
itemCount: 3,
),
),
),
bottomNavigationBar: BottomNavigationBar(items: [
BottomNavigationBarItem(icon: Icon(Icons.home), label: "Home"),
BottomNavigationBarItem(icon: Icon(Icons.settings), label: "Settings"),
]),
);
Better use:
Scaffold.of(context).openDrawer();

Flutter - how remove padding from BottomNavigationBar?

I use BottomNavigationBar in my flutter app. I have additional requirements for appearance, this is the result that I got. everything is fine except for the top and bottom padding (arrows in the figure).
This is my code:
BottomNavigationBar(
selectedFontSize: 0,
type: BottomNavigationBarType.fixed,
currentIndex: currIndex,
items: tabs.map((e) {
return BottomNavigationBarItem(
title: SizedBox.shrink(),
icon: _buildIcon(e),
);
}).toList(),
)
Widget _buildIcon(Data data) {
return Container(
width: double.infinity,
height:kBottomNavigationBarHeight ,
child: Material(
color: _getBackgroundColor(data.index),
child: InkWell(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Icon(Icons.email_outlined),
Text('111', style: TextStyle(fontSize: 12, color: Colors.white)),
],
),
onTap: () {
onTabSelected(data.index);
},
),
),
);
}
how can i remove those top and bottom padding? any ideas i will greatly appreciate.
I made a sample code using your part code.
But I can not reproduce like your problem with shared your code.
Could you share a part of Scaffold's bottomNavigationBar or other related to code.
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#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> {
int _counter = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
],
),
),
bottomNavigationBar: BottomNavigationBar(
selectedFontSize: 0,
type: BottomNavigationBarType.fixed,
currentIndex: 0,
items: [
new BottomNavigationBarItem(
icon: _buildIcon(),
title: SizedBox.shrink(),
),
new BottomNavigationBarItem(
icon: _buildIcon(),
title: SizedBox.shrink(),
),
new BottomNavigationBarItem(
icon: _buildIcon(),
title: SizedBox.shrink(),
)
]));
}
Widget _buildIcon() {
return Container(
width: double.infinity,
height: kBottomNavigationBarHeight,
child: Material(
color: Colors.grey,
child: InkWell(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Icon(Icons.email_outlined),
Text('111', style: TextStyle(fontSize: 12, color: Colors.white)),
],
),
onTap: () {},
),
),
);
}
}

Flutter - Multi Page Navigation using bottom navigation bar icons

I'm trying to navigate to different pages within my app using the icons in my bottom navigation bar. I have tried many tutorials and can't seem to work out the best way to achieve this. I have created my Homepage (code below) and 2 additional pages, Inbox and Signin, both return simple scaffolds.
Firstly i'm interested to know if this is the best way to do what i'm trying to achieve and second, how can my code be altered to allow me to navigate to different pages depending on which icon is tapped. I'm aware that the code below doesn't execute, i'm just trying to show what i've tried.
My code:
class HomePage extends StatefulWidget {
#override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
_onTap(int index) {
Navigator.of(context)
.push(MaterialPageRoute<Null>(builder: (BuildContext context) {
return _children[_currentIndex];
}));}
final List<Widget> _children = [
HomePage(),
InboxPage(),
SignInPage()
];
int _currentIndex = 0;
#override
Widget build(BuildContext context) {
SizeConfig().init(context);
return Scaffold(
appBar: PreferredSize(preferredSize: Size(double.infinity, 75),
child: AppBar(
elevation: 0.0,
centerTitle: false,
title: Column(
children: <Widget>[
Align(
alignment: Alignment.centerLeft,
child: Text(
currentDate,
textAlign: TextAlign.left,
style: TextStyle(
color: titleTextColor,
fontWeight: subTitleFontWeight,
fontFamily: titleFontFamily,
fontSize: subTitleFontSize),
),
),
SizedBox(
height: 15,
),
Align(
alignment: Alignment.centerLeft,
child: Text(
'Some text here',
style: TextStyle(
color: titleTextColor,
fontWeight: titleTextFontWeight,
fontFamily: titleFontFamily,
fontSize: titleFontSize),
),
),
],
),
backgroundColor: kPrimaryColor,
shape: titleBarRounding
),
),
body: BodyOne(),
bottomNavigationBar: BottomNavigationBar(
currentIndex: _currentIndex,
type: BottomNavigationBarType.fixed,
items: [
BottomNavigationBarItem(
icon: Icon(Icons.home),
title: Text('Home'),
),
BottomNavigationBarItem(
icon: Icon(Icons.mail),
title: Text('Inbox'),
),
BottomNavigationBarItem(
icon: Icon(Icons.account_circle),
title: Text('Account'),
)
],
onTap: () => _onTap(_currentIndex),
),);
}
}
Thanks in advance.
The screen you are in can't be part of the Screens you're navigating to and you don't need to push a new screen each time you just have to change selectedPage, this is an example of how it should look:
import 'package:flutter/material.dart';
class HomePage extends StatefulWidget {
#override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
int selectedPage = 0;
final _pageOptions = [
HomeScreen(),
InboxScreen(),
SignInScreen()
];
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
body: _pageOptions[selectedPage],
bottomNavigationBar: BottomNavigationBar(
items: [
BottomNavigationBarItem(icon: Icon(Icons.home, size: 30), title: Text('Home')),
BottomNavigationBarItem(icon: Icon(Icons.mail, size: 30), title: Text('Inbox')),
BottomNavigationBarItem(icon: Icon(Icons.account_circle, size: 30), title: Text('Account')),
],
selectedItemColor: Colors.green,
elevation: 5.0,
unselectedItemColor: Colors.green[900],
currentIndex: selectedPage,
backgroundColor: Colors.white,
onTap: (index){
setState(() {
selectedPage = index;
});
},
)
);
}
}
Let me know if you need more explanation.
The input parameter of the _onTap function is unused and needs to be deleted.
_onTap() {
Navigator.of(context)
.push(MaterialPageRoute(builder: (BuildContext context) => _children[_currentIndex])); // this has changed
}
In the onTap of the BottomNavigationBar you need to change the _currentIndex and then call the _onTap function which navigates to the selected screen.
onTap: (index) {
setState(() {
_currentIndex = index;
});
_onTap();
},
You can add this BottomNavigationBar to all of the screens, but pay attention to the initial value of the _currentIndex that changes according to the screen you're putting the BottomNavigationBar in.
Full code:
_onTap() { // this has changed
Navigator.of(context)
.push(MaterialPageRoute(builder: (BuildContext context) => _children[_currentIndex])); // this has changed
}
final List<Widget> _children = [
HomePage(),
InboxPage(),
SignInPage()
];
#override
Widget build(BuildContext context) {
SizeConfig().init(context);
return Scaffold(
appBar: PreferredSize(
preferredSize: Size(double.infinity, 75),
child: AppBar(
elevation: 0.0,
centerTitle: false,
title: Column(
children: <Widget>[
Align(
alignment: Alignment.centerLeft,
child: Text(
currentDate,
textAlign: TextAlign.left,
style: TextStyle(
color: titleTextColor,
fontWeight: subTitleFontWeight,
fontFamily: titleFontFamily,
fontSize: subTitleFontSize),
),
),
SizedBox(
height: 15,
),
Align(
alignment: Alignment.centerLeft,
child: Text(
'Some text here',
style: TextStyle(
color: titleTextColor,
fontWeight: titleTextFontWeight,
fontFamily: titleFontFamily,
fontSize: titleFontSize),
),
),
],
),
backgroundColor: kPrimaryColor,
shape: titleBarRounding
),
),
body: BodyOne(),
body: Container(),
bottomNavigationBar: BottomNavigationBar(
currentIndex: _currentIndex,
type: BottomNavigationBarType.fixed,
items: [
BottomNavigationBarItem(
icon: Icon(Icons.home),
title: Text('Home'),
),
BottomNavigationBarItem(
icon: Icon(Icons.mail),
title: Text('Inbox'),
),
BottomNavigationBarItem(
icon: Icon(Icons.account_circle),
title: Text('Account'),
)
],
onTap: (index) { // this has changed
setState(() {
_currentIndex = index;
});
_onTap();
},
),
);
}
The best way to do it is creating a wrapper to your screens. Like this:
class Wrapper extends StatefulWidget {
Wrapper();
_WrapperState createState() => _WrapperState();
}
class _WrapperState extends State<Wrapper> {
int _currentIndex = 0;
final List<Widget> _children = [
HomePage(),
InboxPage(),
SignInPage()
];
void onTabTapped(int index) {
setState(() {
_currentIndex = index;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: _children[_currentIndex],
bottomNavigationBar: BottomNavigationBar(
onTap: onTabTapped,
currentIndex: _currentIndex,
items:[
BottomNavigationBarItem(
icon: Icon(Icons.home),
title: Text('Home'),
),
BottomNavigationBarItem(
icon: Icon(Icons.mail),
title: Text('Inbox'),
),
BottomNavigationBarItem(
icon: Icon(Icons.account_circle),
title: Text('Account'),
)
],
),
);
}
}

How to give onPress function for BottomNavigationBar menu in flutter?

i have a bottomnavigation bar in flutter ,what i want is on click of the individual widgets of the bottombar it should navigate me to the next page
Widget _bottemTab() {
return new BottomNavigationBar(
currentIndex: _currentIndex,
onTap:(newIndex) => setState((){_currentIndex = newIndex;}),
type: BottomNavigationBarType.fixed,
items: [
new BottomNavigationBarItem(
icon: Image.asset(
"assets/home.png",
width: 24.0,
height: 24.0,
),
title: Text(
'Home',
),
),
new BottomNavigationBarItem(
icon: Image.asset(
"assets/shopping-bagg.png",
width: 24.0,
height: 24.0,
),
title: Text(
'Mall',
)),
new BottomNavigationBarItem(
icon: Image.asset(
"assets/qr-code.png",
width: 24.0,
height: 24.0,
),
title: Text(
'Scan',
)),
new BottomNavigationBarItem(
icon: Image.asset(
"assets/bank.png",
width: 24.0,
height: 24.0,
),
title: Text(
'Bank',
)),
new BottomNavigationBarItem(
icon: Image.asset(
"assets/delivery.png",
width: 24.0,
height: 24.0,
),
title: Text(
'Inbox',
)),
]);
}
i want is on click of the individual widgets of the bottombar it should navigate me to the next page which i have created separately for each menu items of bottom navigation view..any help is appreciated
In your build() method, you can add this logic.
#override
Widget build(BuildContext context) {
Widget widget = Container(); // default
switch (_currentIndex) {
case 0:
widget = FirstPage();
break;
case 1:
widget = SecondPage();
break;
case 2:
widget = ThirdPage();
break;
}
return Scaffold(
body: widget,
// ...
);
}
Update:
I'm not sure how you did that, here you can see a small example of doing it right way.
int _index = 0;
#override
Widget build(BuildContext context) {
Widget child = Container();
switch(_index) {
case 0:
child = FlutterLogo(colors: Colors.orange);
break;
case 1:
child = FlutterLogo();
break;
}
return Scaffold(
appBar: AppBar(),
bottomNavigationBar: _bottomTab(),
body: SizedBox.expand(child: child),
);
}
Widget _bottomTab() {
return BottomNavigationBar(
currentIndex: _index,
onTap: (int index) => setState(() => _index = index),
backgroundColor: Colors.deepPurple,
items: [
BottomNavigationBarItem(icon: Icon(Icons.looks_one), title: Text("1")),
BottomNavigationBarItem(icon: Icon(Icons.looks_two), title: Text("2")),
],
);
}
Hope this helps.
int _selectedIndex = 0;
static const TextStyle optionStyle = TextStyle(fontSize: 30, fontWeight: FontWeight.bold);
static const _pages = <Widget>[
Home(),//this is a stateful widget on a separate file
Business(),//this is a stateful widget on a separate file
School(),//this is a stateful widget on a separate file
];
void _onItemTapped(int index) {
setState(() {
_selectedIndex = index;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('BottomNavigationBar Sample'),
),
body: Center(
child: _pages.elementAt(_selectedIndex),
),
bottomNavigationBar: BottomNavigationBar(
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: Icon(Icons.home),
title: Text('Home'),
),
BottomNavigationBarItem(
icon: Icon(Icons.business),
title: Text('Business'),
),
BottomNavigationBarItem(
icon: Icon(Icons.school),
title: Text('School'),
),
],
currentIndex: _selectedIndex,
selectedItemColor: Colors.amber[800],
onTap: _onItemTapped,
),
);
}