Create Complete quiz app using flutter app with timer :
import 'dart:async';
import 'package:flutter/material.dart';
class quizApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: quizAppScreen(),
);
}
}
class quizAppScreen extends StatefulWidget {
@override
quizAppScreenState createState() => quizAppScreenState();
}
class quizAppScreenState extends State<quizAppScreen> {
String? _selectedValue1;
String? _selectedValue2;
String? _selectedValue3;
int _secondsRemaining = 20;
late Timer _timer;
@override
void initState() {
super.initState();
startTimer();
}
void startTimer() {
_timer = Timer.periodic(Duration(seconds: 1), (timer) {
setState(() {
if (_secondsRemaining > 0) {
_secondsRemaining--;
} else {
_timer.cancel();
_timerFinished();
}});
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Quiz App'),
),
body:SingleChildScrollView(
child: Column(
children: [
Container(
margin: EdgeInsets.only(bottom: 20),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(50),
border: Border.all(width: 2.0, color: Colors.black)
),
child: Padding(
padding: EdgeInsets.all(20),
child: Text('$_secondsRemaining',
style: TextStyle(fontSize: 24),),
)
),
Container(
child: Column(
children: [
Text('Q1. What is the capital of France',style: TextStyle(fontSize: 20,),),
RadioListTile(
title: Text('a) Paris'),
value: 'Option 1',
groupValue: _selectedValue1,
onChanged: (value) {
setState(() {
_selectedValue1 = value.toString();
});
},
),
RadioListTile(
title: Text('b) London'),
value: 'Option 2',
groupValue: _selectedValue1,
onChanged: (value) {
setState(() {
_selectedValue1 = value.toString();
});
},
),
RadioListTile(
title: Text('c) Berlin'),
value: 'Option 3',
groupValue: _selectedValue1,
onChanged: (value) {
setState(() {
_selectedValue1 = value.toString();
});
},
),
RadioListTile(
title: Padding(
padding: EdgeInsets.all(0),
child:Text('d) Perth'),
),
value: 'Option 4',
groupValue: _selectedValue1,
onChanged: (value) {
setState(() {
_selectedValue1 = value.toString();
});
},
),
],
)
),
Container(
margin: EdgeInsets.only(top: 30),
child: Column(
children: [
Padding(padding: EdgeInsets.only(right: 30),
child:Text('Q2. Who is the author of the Harry Potter series?',style: TextStyle(fontSize: 20,),),
),
RadioListTile(
title: Text('a) George R.R. Martin '),
value: 'Option 1',
groupValue: _selectedValue2,
onChanged: (value) {
setState(() {
_selectedValue2 = value.toString();
});
},
),
RadioListTile(
title: Text('b) Stephen King'),
value: 'Option 2',
groupValue: _selectedValue2,
onChanged: (value) {
setState(() {
_selectedValue2 = value.toString();
});
},
),
RadioListTile(
title: Text('c) J.K. Rowling'),
value: 'Option 3',
groupValue: _selectedValue2,
onChanged: (value) {
setState(() {
_selectedValue2 = value.toString();
});
},
),
RadioListTile(
title: Padding(
padding: EdgeInsets.all(0),
child:Text('d) J.R.R. Tolkien'),
),
value: 'Option 4',
groupValue: _selectedValue2,
onChanged: (value) {
setState(() {
_selectedValue2 = value.toString();
});
},
),
],
)
),
Container(
margin: EdgeInsets.only(top: 30),
child: Column(
children: [
Padding(padding: EdgeInsets.only(left: 20),
child:Text('Q3. Which planet is known as the Red Planet?',style: TextStyle(fontSize: 20,),),
),
RadioListTile(
title: Text('a) Mars'),
value: 'Option 1',
groupValue: _selectedValue3,
onChanged: (value) {
setState(() {
_selectedValue3 = value.toString();
});
},
),
RadioListTile(
title: Text('b) Venus'),
value: 'Option 2',
groupValue: _selectedValue3,
onChanged: (value) {
setState(() {
_selectedValue3 = value.toString();
});
},
),
RadioListTile(
title: Text('c) Jupiter'),
value: 'Option 3',
groupValue: _selectedValue3,
onChanged: (value) {
setState(() {
_selectedValue3 = value.toString();
});
},
),
RadioListTile(
title: Padding(
padding: EdgeInsets.all(0),
child:Text('d) Saturn'),
),
value: 'Option 4',
groupValue: _selectedValue3,
onChanged: (value) {
setState(() {
_selectedValue3 = value.toString();
});
},
),
],
)
),
],
),
)
);
}
void _timerFinished() {
setState(() {
_secondsRemaining = 0;
// Setting seconds to 0
});
showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
content: Text('Oops! time up'),
actions: <Widget>[
TextButton(
onPressed: () {
Navigator.of(context).pop();
},
child: Text('OK'),
),
],
);
},
);
}
}
Create Route to navigate into one app page to another app page:
import 'package:flutter/material.dart';
class FirstRoute extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('First Screen'),
),
body: Center(
child: ElevatedButton(
child: Text('Click Here'),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => SecondRoute()),
);
},
),
),
);
}
}
class SecondRoute extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Second Screen"),
),
body: Center(
child: ElevatedButton(
onPressed: () {
Navigator.pop(context);
},
child: Text('Go back'),
),
),
);
}
}
How to pass data from one screen to another screen:
Code of FirstRoute.dart
Second Screen:
Flutter Icon Example:
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
class IconExample extends StatefulWidget {
const IconExample({Key? key}) : super(key: key);
@override
State<IconExample> createState() => _IconExampleState();
}
class _IconExampleState extends State<IconExample> {
String dropdownValue = 'Mango';
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: const Text("DDDD")),
body: Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: <Widget>[
Icon(Icons.camera_enhance),
Icon(Icons.camera_front),
Icon(Icons.camera_rear),
Icon(Icons.face),
Icon(Icons.login),
Icon(Icons.money),
]),
);
}
}
Create Animation in Flutter:
import 'package:flutter/material.dart';
class HeroAnimation extends StatefulWidget {
HeroAnimation() : super();
@override
_HeroAnimationState createState() => _HeroAnimationState();
}
class _HeroAnimationState extends State<HeroAnimation> {
Widget _greenRectangle() {
return Container(
width: 75,
height: 75,
color: Colors.green,
);
}
Widget _detailPageRectangle() {
return Container(
width: 150,
height: 150,
color: Colors.red,
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Welcome'),
),
body: buildDemoWidget(context),
);
}
Widget buildDemoWidget(BuildContext context) {
return Center(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
SizedBox(
height: 30.0,
),
ListTile(
leading: GestureDetector(
child: Hero(
tag: 'hero-rectangle',
child: _greenRectangle(),
),
onTap: () => _gotoDetailsPage(context),
),
title: Text('Tap on the green icon rectangle to analyse hero animation transition.'),
),
],
),
);
}
void _gotoDetailsPage(BuildContext context) {
Navigator.of(context).push(MaterialPageRoute(
builder: (ctx) => Scaffold(
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Hero(
tag: 'hero-rectangle',
child: _detailPageRectangle(),
),
Text('This is a place where you can see details about the icon tapped at previous page.'),
],
),
),
),
));
}
}
Another Example of Animation in Flutter:-
import 'dart:ffi';
import 'package:flutter/animation.dart';
import 'package:flutter/material.dart';
class MyHomePage1 extends StatefulWidget {
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<MyHomePage1> with SingleTickerProviderStateMixin {
late Animation<double> animation;
late AnimationController animationController;
@override
void initState() {
super.initState();
animationController = AnimationController(vsync: this, duration: Duration(milliseconds: 2500));
animation = CurvedAnimation(parent: animationController, curve: Curves.easeInOut);
animation.addListener((){
setState((){
print (animation.value.toString());
});
});
animation.addStatusListener((status){
if(status == AnimationStatus.completed){
animationController.reverse();
} else if(status == AnimationStatus.dismissed) {
animationController.forward();
}
});
animationController.forward();
}
@override
Widget build(BuildContext context) {
return Center(
child: AnimatedLogo(
animation: animation,
)
);
}
}
class AnimatedLogo extends AnimatedWidget {
final Tween<double> _sizeAnimation = Tween<double>(begin: 0.0, end: 500.0);
AnimatedLogo({Key? key, required Animation<double> animation}) : super(key: key, listenable: animation);
@override
Widget build(BuildContext context) {
final Animation<double> animation = listenable as Animation<double>;
return Transform.scale(
scale: _sizeAnimation.evaluate(animation),
child: FlutterLogo(),
);
}
}
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