Book Image

Flutter Cookbook

By : Simone Alessandria, Brian Kayfitz
4 (1)
Book Image

Flutter Cookbook

4 (1)
By: Simone Alessandria, Brian Kayfitz

Overview of this book

“Anyone interested in developing Flutter applications for Android or iOS should have a copy of this book on their desk.” – Amazon 5* Review Lauded as the ‘Flutter bible’ for new and experienced mobile app developers, this recipe-based guide will teach you the best practices for robust app development, as well as how to solve cross-platform development issues. From setting up and customizing your development environment to error handling and debugging, The Flutter Cookbook covers the how-tos as well as the principles behind them. As you progress, the recipes in this book will get you up to speed with the main tasks involved in app development, such as user interface and user experience (UI/UX) design, API design, and creating animations. Later chapters will focus on routing, retrieving data from web services, and persisting data locally. A dedicated section also covers Firebase and its machine learning capabilities. The last chapter is specifically designed to help you create apps for the web and desktop (Windows, Mac, and Linux). Throughout the book, you’ll also find recipes that cover the most important features needed to build a cross-platform application, along with insights into running a single codebase on different platforms. By the end of this Flutter book, you’ll be writing and delivering fully functional apps with confidence.
Table of Contents (17 chapters)
About Packt

How it works...

When you retrieve data from a web API, the first step is usually to define which fields you are interested in. In this case, we only want to show a selection of the available data that Google Books publishes: in particular the ID, title, authors, thumbnail, and a description of each book.

When a web service returns data in JSON format, in Dart and Flutter you can treat it as a Map. The name of the fields are strings, and the values can be any data type: that's why we created a constructor that takes a Map<String, dynamic> and returns a Book.

In the Book.fromJson constructor, based on the JSON format returned by the service, you read the relevant data. Note the instructions:

 String image = parsedJson['volumeInfo']['imageLinks'] == null
? ''
: parsedJson['volumeInfo']['imageLinks']['thumbnail'];
image.replaceAll('http://', 'https://');

When you read data returned by a web service...