Flutter - Open Modal Bottom Sheet on Bottom navigation bar item click - flutter

Question

How do i open bottom sheet from bottom navigation bar item click. This is my current code for the page, this is what i have tried so far but it does not seem to be working. I have created the bottom navigation bar successfully and with the functions Page1(), Page2(), Page3(), i can successfully migrate to other pages, now i need the forth item to just open a bottom sheet where i can do more items. The function showBottomSheet() should be able to open a bottom sheet
class _MyNavigationBarState extends State<MyNavigationBar > {
int _currentTabIndex = 0;
#override
Widget build(BuildContext context) {
final _kTabPages = <Widget>[
Page1(),
Page2(),
Page3(),
showBottomSheet()
];
final _kBottmonNavBarItems = <BottomNavigationBarItem>[
const BottomNavigationBarItem(icon: Icon(Icons.home), label: 'Home'),
const BottomNavigationBarItem(icon: Icon(Icons.network_cell), label: 'Prices'),
const BottomNavigationBarItem(icon: Icon(Icons.add_circle), label: 'Trade'),
const BottomNavigationBarItem(icon: Icon(Icons.account_balance_wallet), label: 'Wallet'),
];
assert(_kTabPages.length == _kBottmonNavBarItems.length);
final bottomNavBar = BottomNavigationBar(
items: _kBottmonNavBarItems,
currentIndex: _currentTabIndex,
type: BottomNavigationBarType.fixed,
onTap: (int index) {
setState(() {
_currentTabIndex = index;
});
},
);
return Scaffold(
body: _kTabPages[_currentTabIndex],
bottomNavigationBar: bottomNavBar,
),
);
}
}
showBottomSheet(){
Container _buildBottomSheet(BuildContext context) {
return Container(
height: 300,
padding: const EdgeInsets.all(8.0),
decoration: BoxDecoration(
border: Border.all(color: Colors.blue, width: 2.0),
borderRadius: BorderRadius.circular(8.0),
),
child: ListView(
children: <Widget>[
const ListTile(title: Text('Bottom sheet')),
const TextField(
keyboardType: TextInputType.number,
decoration: InputDecoration(
border: OutlineInputBorder(),
icon: Icon(Icons.attach_money),
labelText: 'Enter an integer',
),
),
Container(
alignment: Alignment.center,
child: ElevatedButton.icon(
icon: const Icon(Icons.save),
label: const Text('Save and close'),
onPressed: () => Navigator.pop(context),
),
)
],
),
);
}
}

Answer 1

try this:
class _MyNavigationBarState extends State<MyNavigationBar > {
int _currentTabIndex = 0;
#override
Widget build(BuildContext context) {
final _kTabPages = <Widget>[
Page1(),
Page2(),
Page3(),
Container(),
];
final _kBottmonNavBarItems = <BottomNavigationBarItem>[
const BottomNavigationBarItem(icon: Icon(Icons.home), label: 'Home'),
const BottomNavigationBarItem(icon: Icon(Icons.network_cell), label: 'Prices'),
const BottomNavigationBarItem(icon: Icon(Icons.add_circle), label: 'Trade'),
const BottomNavigationBarItem(icon: Icon(Icons.account_balance_wallet), label: 'Wallet'),
];
assert(_kTabPages.length == _kBottmonNavBarItems.length);
final bottomNavBar = BottomNavigationBar(
items: _kBottmonNavBarItems,
currentIndex: _currentTabIndex,
type: BottomNavigationBarType.fixed,
onTap: (int index) {
if(index == 3){
showBottomSheet();
return;
}
setState(() {
_currentTabIndex = index;
});
},
);
return Scaffold(
body: _kTabPages[_currentTabIndex],
bottomNavigationBar: bottomNavBar,
),
);
}
}
showBottomSheet(){
Container _buildBottomSheet(BuildContext context) {
return Container(
height: 300,
padding: const EdgeInsets.all(8.0),
decoration: BoxDecoration(
border: Border.all(color: Colors.blue, width: 2.0),
borderRadius: BorderRadius.circular(8.0),
),
child: ListView(
children: <Widget>[
const ListTile(title: Text('Bottom sheet')),
const TextField(
keyboardType: TextInputType.number,
decoration: InputDecoration(
border: OutlineInputBorder(),
icon: Icon(Icons.attach_money),
labelText: 'Enter an integer',
),
),
Container(
alignment: Alignment.center,
child: ElevatedButton.icon(
icon: const Icon(Icons.save),
label: const Text('Save and close'),
onPressed: () => Navigator.pop(context),
),
)
],
),
);
}
}

Answer 2

implement 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 MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
#override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _selectedIndex = 0;
static const TextStyle optionStyle = TextStyle(fontSize: 30, fontWeight: FontWeight.bold);
static const List<Widget> _widgetOptions = <Widget>[
Text(
'Index 0: Home',
style: optionStyle,
),
Text(
'Index 1: Business',
style: optionStyle,
),
Text(
'Index 2: School',
style: optionStyle,
),
Text(
'Index 3: Settings',
style: optionStyle,
),
];
void _onItemTapped(int index) {
setState(() {
_selectedIndex = index;
});
showModalBottomSheet<void>(
context: context,
builder: (BuildContext context) {
return Container(
height: 200,
color: Colors.amber,
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Text('BottomSheet $index'),
ElevatedButton(
child: Text('Close BottomSheet $index'),
onPressed: () => Navigator.pop(context),
)
],
),
),
);
},
);
}
#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),
label: 'Home',
backgroundColor: Colors.red,
),
BottomNavigationBarItem(
icon: Icon(Icons.business),
label: 'Business',
backgroundColor: Colors.green,
),
BottomNavigationBarItem(
icon: Icon(Icons.school),
label: 'School',
backgroundColor: Colors.purple,
),
BottomNavigationBarItem(
icon: Icon(Icons.settings),
label: 'Settings',
backgroundColor: Colors.pink,
),
],
currentIndex: _selectedIndex,
selectedItemColor: Colors.amber[800],
onTap: _onItemTapped,
),
);
}
}