Flutter how to create clickable tabs - flutter

Question

How to create basic design like from sketch from image. First container with list of tabs is static, and containers above it is dynamic, and contain text - Text for tab 1 if tab 1 is clicked, or Text for tab 2 if tab 2 is clicked. Also text for Tab1 or Tab2 must be underline if we click on it.
Something like this:

Answer 1

Using a GestureDetector widget to tell when a user taps on the tabs and then updating the state with setState is maybe the most simple way of doing this.
Here is a very basic example of using a stateful widget and setState to update the page. You can approach this problem with any state management strategy, though.
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,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: Scaffold(body: MyHomePage()),
);
}
}
class MyHomePage extends StatefulWidget {
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
String selectedTab;
static const String TAB_1 = 'Tab 1';
static const String TAB_2 = 'Tab 2';
#override
Widget build(BuildContext context) {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Expanded(
flex: 1,
child: Row(
crossAxisAlignment: CrossAxisAlignment.end,
children: [
GestureDetector(
onTap: () {
setState(() => selectedTab = TAB_1);
},
child: Container(
padding: const EdgeInsets.all(12.0),
child: Text(TAB_1),
decoration: selectedTab == TAB_1
? BoxDecoration(border: Border(bottom: BorderSide()))
: null,
),
),
GestureDetector(
onTap: () {
setState(() => selectedTab = TAB_2);
},
child: Container(
padding: const EdgeInsets.all(12.0),
child: Text(TAB_2),
decoration: selectedTab == TAB_2
? BoxDecoration(border: Border(bottom: BorderSide()))
: null,
),
)
],
),
),
Container(height: 20.0),
Expanded(
flex: 2,
child: Container(
decoration: BoxDecoration(
border: Border.all(width: 5),
borderRadius: BorderRadius.circular(12.0)),
child: Center(child: Text(textForTab(selectedTab))),
),
)
],
);
}
String textForTab(String tabId) {
switch (tabId) {
case TAB_1:
return 'Text for Tab 1';
case TAB_2:
return 'Text for Tab 2';
default:
return 'Select Tab';
}
}
}

Answer 2

You can do it using TabBar widget.
class CustomTabBar extends StatefulWidget {
#override
_CustomTabBarState createState() => _CustomTabBarState();
}
class _CustomTabBarState extends State<CustomTabBar>
with SingleTickerProviderStateMixin {
TabController _tabController;
#override
void initState() {
_tabController = TabController(length: 2, vsync: this);
super.initState();
}
#override
void dispose() {
super.dispose();
_tabController.dispose();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(
'Tab Demo',
),
),
body:
Column(
children: [
Container(
height: 45,
child: TabBar(
controller: _tabController,
indicator: BoxDecoration(
border: Border(bottom: BorderSide(color: Colors.blue,width: 2,style:
BorderStyle.solid)),
),
labelColor: Colors.blue,
unselectedLabelColor: Colors.black,
tabs: [
// first tab
Tab(
text: 'Home',
),
// second tab
Tab(
text: 'Profile',
),
],
),
),
// tab bar view
Expanded(
child: TabBarView(
controller: _tabController,
children: [
// first tab widget
Center(
child: Text(
'Home',
style: TextStyle(
fontSize: 26,
fontWeight: FontWeight.bold,
),
),
),
// Second tab widget
Center(
child: Text(
'Profile',
style: TextStyle(
fontSize: 26,
fontWeight: FontWeight.bold,
),
),
),
],
),
),
],
),
);
}
}

Answer 3

I'm not sure I understand you completely.
But if you want to implement a TabBar, you can use flutter TabBar() documented here:
https://flutter.dev/docs/cookbook/design/tabs
Or there is a package you can use:
https://pub.dev/packages/tabbar