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

The building blocks of OOP

Where Dart does deviate from other OOP languages, such as Java, C#, Kotlin, and Swift, is its lack of explicit keywords for interfaces and abstract classes. In Dart, objects are more defined by how they are used rather than how they are defined.

There are three keywords for building relationships among classes:


Class Inheritance

Use this keyword with any class where you want to extend the superclass's functionality. A class can only extend one class. Dart does not support multiple inheritance.


Interface Conformance

You can use implements when you want to create your own implementation of another class, as all classes are implicit interfaces. When the FullName class implements the Name class, all the functions that were defined in the Name class must be implemented. This means that when you implement a class, you do not inherit any code, just the type. 

Classes can implement any number of interfaces, but be reasonable and don't make that list too long.


Apply Mixin

In Dart, a class can only extend another class. Mixins allow you to reuse a class's code in multiple class hierarchies. This means that mixins allow you to get blocks of code without needing to create subclasses.

Dart 2.1 added the mixin keyword to the language. Previously, mixins were also just abstract classes, and they can still be used in that manner if desired.