How to do it...

In order to create a responsive app that also targets the web, follow these steps:

1. Create a new Flutter project, and call it books_universal.
2. In the project's pubspec.yaml file, in the dependencies section, add the latest version of the http package:

 http: ^0.13.0

3. In the lib directory of your project, create three new directories, called models, data, and screens.

4. In the models directory, create a new file, called book.dart.

5. In the book.dart file, create a class called Book, with the fields specified here:

 class Book {
   String id;
   String title;
   String authors;
   String thumbnail;
   String description;
 }

6. In the Book class, create a constructor that sets all the fields:

 Book(this.id, this.title, this.authors, this.thumbnail, 
   this.description);

7. Create a named factory constructor, called fromJson, that takes a Map and returns a Book, as shown in the code sample:

 factory Book.fromJson(Map<String, dynamic> parsedJson) {
   final String...