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A simple book list Flutter example using the Google Books API
/*
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
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided
with the distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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)),
),
],
),
);
}
}
@Lurch9000
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I think you need to wrap the JSON Parsing into a TRY/CATCH block. Error will still happen but the app won't crash anymore

@misterdarkness
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misterdarkness commented Oct 15, 2020

Interestingly, in college I just had to write one material in college related to books. And the books did not help me very much, they had a lot of unnecessary things, so the books became irrelevant for me, and I turned to the site https://edubirdie.com/do-my-homework which helped me in college on these book materials, and everything was written gorgeous. They do my homework with books, I got the highest rating, and was incredibly pleased, I advise everyone!

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