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...

InheritedWidgets are some of the most fascinating widgets in the whole Flutter framework. Their job isn't to render anything on the screen, but to pass data down to lower widgets in the tree. Just like any other widget in Flutter, InheritedWidgets can also have child widgets.

Let's break down the first portion of the PlanProvider class:

class PlanProvider extends InheritedWidget {
final _plans = <Plan>[];

PlanProvider({Key key, Widget child}) : super(key: key, child: child);

bool updateShouldNotify(InheritedWidget oldWidget) => false;

First, we define an object that will store the plans (_plans). Then, we define a default unnamed constructor, which takes in a key and a child, and passes them to the superclass (super). 

InheritedWidget is an abstract class, so you must implement the updateShouldNotify method. Flutter calls this method whenever the widget is rebuilt. In the updateShouldNotify method, you can look at the...