* 겪고 있는 문제 상황을 최대한 자세하게 작성해주세요.
* 문제 해결을 위해 어떤 시도를 해보았는지 구체적으로 함께 알려주세요.
아래 각 파일별 모든 코드 작성드립니다.
4-6강의 6분쯤 Book book = bookService.bookList.elementAt(index);
부분
Book 퀵픽스 후 뒤에 있는 book 아래 노란밑줄 오류가 안없어지는데 해결방법 질문드립니다.
작성한 코드 및 에러 메세지
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'book.dart';
import 'book_service.dart';
void main() {
runApp(
MultiProvider(
providers: [
ChangeNotifierProvider(create: (context) => BookService()),
],
child: const MyApp(),
),
);
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: HomePage(),
);
}
}
class HomePage extends StatefulWidget {
HomePage({Key? key}) : super(key: key);
@override
State<HomePage> createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
var bottomNavIndex = 0;
@override
Widget build(BuildContext context) {
return Scaffold(
body: [
SearchPage(),
LikedBookPage(),
].elementAt(bottomNavIndex),
bottomNavigationBar: BottomNavigationBar(
selectedItemColor: Colors.black,
unselectedItemColor: Colors.grey,
showUnselectedLabels: true,
selectedFontSize: 12,
unselectedFontSize: 12,
iconSize: 28,
type: BottomNavigationBarType.fixed,
onTap: (value) {
setState(() {
bottomNavIndex = value;
});
},
items: [
BottomNavigationBarItem(
icon: Icon(Icons.search),
label: '검색',
),
BottomNavigationBarItem(
icon: Icon(Icons.star),
label: '좋아요',
),
],
currentIndex: bottomNavIndex,
),
);
}
}
class SearchPage extends StatelessWidget {
SearchPage({super.key});
@override
Widget build(BuildContext context) {
return Consumer<BookService>(
builder: (context, bookService, child) {
return Scaffold(
appBar: AppBar(
backgroundColor: Colors.white,
toolbarHeight: 80,
title: TextField(
onSubmitted: (value) {
bookService.search(value);
},
cursorColor: Colors.grey,
decoration: InputDecoration(
prefixIcon: Icon(Icons.search, color: Colors.grey),
hintText: "작품, 감독, 배우, 컬렉션, 유저 등",
border: OutlineInputBorder(
borderSide: BorderSide(color: Colors.white),
borderRadius: BorderRadius.all(Radius.circular(10)),
),
focusedBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.grey),
borderRadius: BorderRadius.all(Radius.circular(10)),
),
),
),
),
body: Padding(
padding: const EdgeInsets.symmetric(horizontal: 12),
child: ListView.separated(
itemCount: bookService.bookList.length,
separatorBuilder: (context, index) {
return Divider();
},
itemBuilder: (context, index) {
Book book = bookService.bookList.elementAt(index);
return ListTile();
},
),
),
);
},
);
}
}
class LikedBookPage extends StatelessWidget {
const LikedBookPage({super.key});
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Text("좋아요"),
),
);
}
}
-------------------------------------------------------------------
import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'book.dart';
class BookService extends ChangeNotifier {
List<Book> bookList = []; // 책 목록
void search(String q) async {
bookList.clear(); // 검색 버튼 누를때 이전 데이터들을 지워주기
if (q.isNotEmpty) {
Response res = await Dio().get(
"https://www.googleapis.com/books/v1/volumes?q=$q&startIndex=0&maxResults=40",
);
List items = res.data["items"];
for (Map<String, dynamic> item in items) {
Book book = Book(
id: item['id'],
title: item['volumeInfo']['title'] ?? "",
subtitle: item['volumeInfo']['subtitle'] ?? "",
thumbnail: item['volumeInfo']['imageLinks']?['thumbnail'] ??
previewLink: item['volumeInfo']['previewLink'] ?? "",
);
bookList.add(book);
}
}
}
}
------------------------------------------------------------------------------------
class Book {
String id;
String title;
String subtitle;
String thumbnail; // 썸네일 이미지 링크
String previewLink; // ListTile 을 눌렀을 때 이동하는 링크
Book({
required this.id,
required this.title,
required this.subtitle,
required this.thumbnail,
required this.previewLink,
});
}
