/*
Copyright 2018 The Chromium Authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
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with the distribution.
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contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
import 'dart:async';
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
const url =
'https://www.googleapis.com/books/v1/volumes?q=harry+potter+inauthor:rowling';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Book Finder',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: BookFinderPage(),
);
}
}
class BookFinderPage extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Book Finder'),
leading: Icon(Icons.book),
),
body: FutureBuilder(
future: _fetchPotterBooks(),
builder: (context, AsyncSnapshot<List<Book>> snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
if (snapshot.hasError) {
return Center(child: Text('Error: ${snapshot.error}'));
} else {
return ListView(
children: snapshot.data.map((b) => BookTile(b)).toList());
}
} else {
return Center(child: CircularProgressIndicator());
}
}),
);
}
}
class BookTile extends StatelessWidget {
final Book book;
BookTile(this.book);
@override
Widget build(BuildContext context) {
return ListTile(
leading: CircleAvatar(
backgroundImage: NetworkImage(book.thumbnailUrl),
),
title: Text(book.title),
subtitle: Text(book.author),
onTap: () => _navigateToDetailsPage(book, context),
);
}
}
List<Book> _fetchBooks() {
return List.generate(100, (i) => Book(title: 'Book $i', author: 'Author $i'));
}
Future<List<Book>> _fetchPotterBooks() async {
final res = await http.get(url);
if (res.statusCode == 200) {
return _parseBookJson(res.body);
} else {
throw Exception('Error: ${res.statusCode}');
}
}
List<Book> _parseBookJson(String jsonStr) {
final jsonMap = json.decode(jsonStr);
final jsonList = (jsonMap['items'] as List);
return jsonList
.map((jsonBook) => Book(
title: jsonBook['volumeInfo']['title'],
author: (jsonBook['volumeInfo']['authors'] as List).join(', '),
thumbnailUrl: jsonBook['volumeInfo']['imageLinks']
['smallThumbnail'],
))
.toList();
}
class Book {
final String title;
final String author;
final String thumbnailUrl;
Book({@required this.title, @required this.author, this.thumbnailUrl})
: assert(title != null),
assert(author != null);
}
void _navigateToDetailsPage(Book book, BuildContext context) {
Navigator.of(context).push(MaterialPageRoute(
builder: (context) => BookDetailsPage(book),
));
}
class BookDetailsPage extends StatelessWidget {
final Book book;
BookDetailsPage(this.book);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text(book.title)),
body: Padding(
padding: const EdgeInsets.all(15.0),
child: BookDetails(book),
),
);
}
}
class BookDetails extends StatelessWidget {
final Book book;
BookDetails(this.book);
@override
Widget build(BuildContext context) {
return Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
children: [
Image.network(book.thumbnailUrl),
SizedBox(height: 10.0),
Text(book.title),
Padding(
padding: const EdgeInsets.only(top: 10.0),
child: Text(book.author,
style: TextStyle(fontWeight: FontWeight.w700)),
),
],
),
);
}
}
A simple book list Flutter example using the Google Books API
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You can use [html][/html], [css][/css], [php][/php] and more to embed the code. Urls are automatically hyperlinked. Line breaks and paragraphs are automatically generated.