안녕하세요.
수강생 윤정찬입니다.
2주차 숙제 코드 작성 중 아래와 같은 오류가 발생하여 질문 드립니다.
-----
<작성 코드>
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Shazam',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: HomePage(),
);
}
}
class HomePage extends StatefulWidget {
const HomePage({Key? key}) : super(key: key);
@override
State<HomePage> createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
@override
Widget build(BuildContext context) {
return DefaultTabController(
initialIndex: 1,
length: 3,
child: Builder(builder: (context) {
DefaultTabController.of(context)?.addListener(() {
setState(() {});
});
return Scaffold(
body: Stack(
children: [
TabBarView(
children: [
FirstTab(),
SecondTab(),
ThirdTab(),
],
),
SafeArea(
child: Padding(
padding:
const EdgeInsets.symmetric(vertical: 20, horizontal: 16),
child: Column(
children: [
Container(
alignment: Alignment.topCenter,
child: TabPageSelector(
color: DefaultTabController.of(context)?.index == 1
? Colors.blue[300]
: Colors.grey[400],
selectedColor:
DefaultTabController.of(context)?.index == 1
? Colors.white
: Colors.blue,
indicatorSize: 8,
),
),
],
),
),
),
],
),
);
}),
);
}
}
// 첫번째 페이지
class FirstTab extends StatelessWidget {
const FirstTab({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
const songs = [
{
'imageUrl': 'https://i.ytimg.com/vi/jAO0KXRdz_4/hqdefault.jpg',
'title': '가을밤에 든 생각',
'artist': '잔나비',
},
{
'imageUrl': 'https://i.ytimg.com/vi/jAO0KXRdz_4/hqdefault.jpg',
'title': '가을밤에 든 생각',
'artist': '잔나비',
},
{
'imageUrl': 'https://i.ytimg.com/vi/jAO0KXRdz_4/hqdefault.jpg',
'title': '가을밤에 든 생각',
'artist': '잔나비',
},
{
'imageUrl': 'https://i.ytimg.com/vi/jAO0KXRdz_4/hqdefault.jpg',
'title': '가을밤에 든 생각',
'artist': '잔나비',
},
{
'imageUrl': 'https://i.ytimg.com/vi/jAO0KXRdz_4/hqdefault.jpg',
'title': '가을밤에 든 생각',
'artist': '잔나비',
},
{
'imageUrl': 'https://i.ytimg.com/vi/jAO0KXRdz_4/hqdefault.jpg',
'title': '가을밤에 든 생각',
'artist': '잔나비',
},
];
return Center(child: Text('첫번째 페이지'));
}
}
// 두번째 페이지
class SecondTab extends StatelessWidget {
const SecondTab({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Container(
decoration: BoxDecoration(
gradient: LinearGradient(
begin: Alignment.topCenter,
end: Alignment.bottomCenter,
colors: [Colors.blue[200]!, Colors.blue[900]!],
),
),
child: SafeArea(
child: Column(
children: [
Padding(
padding:
const EdgeInsets.symmetric(vertical: 8.0, horizontal: 16.0),
child: Row(
children: [
GestureDetector(
onTap: () {
DefaultTabController.of(context)!.animateTo(0);
},
child: Column(
children: [
Icon(
Icons.person,
color: Colors.white,
),
Text(
"라이브러리",
style: TextStyle(color: Colors.white),
),
],
),
),
Spacer(),
GestureDetector(
onTap: () {
DefaultTabController.of(context)!.animateTo(2);
},
child: Column(
children: [
Icon(
Icons.show_chart,
color: Colors.white,
),
Text(
"차트",
style: TextStyle(color: Colors.white),
),
],
),
),
],
),
),
SizedBox(height: MediaQuery.of(context).size.height * 0.1),
Text(
"Shazam하려면 탭하세요",
style: TextStyle(
color: Colors.white,
fontSize: 24,
fontWeight: FontWeight.bold,
),
),
SizedBox(height: MediaQuery.of(context).size.height * 0.06),
Container(
alignment: Alignment.center,
width: 200,
height: 200,
decoration: BoxDecoration(
color: Colors.blue[300],
shape: BoxShape.circle,
),
child: Image.network(
"https://i.ibb.co/hxNbZ8p/shazam.png",
color: Colors.white,
width: 130,
height: 130,
),
),
SizedBox(height: MediaQuery.of(context).size.height * 0.12),
Container(
alignment: Alignment.center,
width: 50,
height: 50,
decoration: BoxDecoration(
color: Colors.blue[400],
shape: BoxShape.circle,
),
child: Icon(
Icons.search,
color: Colors.white,
size: 30,
),
)
],
),
),
);
}
}
// 세번째 페이지
class ThirdTab extends StatelessWidget {
const ThirdTab({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
const chartData = {
'korea': [
{
'imageUrl': 'https://i.ibb.co/xf2HpfG/dynamite.jpg',
'name': 'Dynamite',
'artist': 'BTS',
},
{
'imageUrl': 'https://i.ibb.co/xf2HpfG/dynamite.jpg',
'name': 'Dynamite',
'artist': 'BTS',
},
{
'imageUrl': 'https://i.ibb.co/xf2HpfG/dynamite.jpg',
'name': 'Dynamite',
'artist': 'BTS',
},
],
'global': [
{
'imageUrl': 'https://i.ibb.co/xf2HpfG/dynamite.jpg',
'name': 'Dynamite',
'artist': 'BTS',
},
{
'imageUrl': 'https://i.ibb.co/xf2HpfG/dynamite.jpg',
'name': 'Dynamite',
'artist': 'BTS',
},
{
'imageUrl': 'https://i.ibb.co/xf2HpfG/dynamite.jpg',
'name': 'Dynamite',
'artist': 'BTS',
},
],
'newyork': [
{
'imageUrl': 'https://i.ibb.co/xf2HpfG/dynamite.jpg',
'name': 'Dynamite',
'artist': 'BTS',
},
{
'imageUrl': 'https://i.ibb.co/xf2HpfG/dynamite.jpg',
'name': 'Dynamite',
'artist': 'BTS',
},
{
'imageUrl': 'https://i.ibb.co/xf2HpfG/dynamite.jpg',
'name': 'Dynamite',
'artist': 'BTS',
},
],
};
return SafeArea(
child: Column(
children: [
Text(
'차트',
style: TextStyle(fontWeight: FontWeight.bold, fontSize: 18),
),
SizedBox(height: 18),
Expanded(
child: ListView(
children: [
Stack(
alignment: Alignment.center,
children: [
Container(
height: 180,
width: double.infinity,
color: Colors.purple[900],
),
Column(
children: [
Container(
width: MediaQuery.of(context).size.width * 0.8,
child: ElevatedButton(
onPressed: () {},
style: ButtonStyle(
backgroundColor:
MaterialStateProperty.all(Colors.white),
),
child: Text(
"국가 및 도시별 차트",
style: TextStyle(
color: Colors.purple[900],
fontWeight: FontWeight.bold,
),
),
),
),
SizedBox(height: 8),
Text(
"전 세계",
style: TextStyle(
color: Colors.white,
fontWeight: FontWeight.bold,
),
),
],
)
],
),
Container(
width: double.infinity,
height: 8,
color: Colors.grey[400],
),
Row(
children: [
Text(
"대한민국 차트",
style: TextStyle(fontSize: 16),
),
Spacer(),
Text(
"모두 보기",
style: TextStyle(color: Colors.blue),
)
],
),
Row(
children: chartData['korea']!.map((element) {
String imageUrl = element['imageurl']!;
String name = element['name']!;
String artist = element['artist']!;
return Column(
children: [
Image.network(imageUrl),
Text(name),
Text(artist),
],
);
}).toList(),
),
],
),
),
],
),
);
}
}
