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 design an app that works both on mobile and on desktop, you should take into account the fact that some gestures are platform-specific. For instance, you cannot right-click with a mouse on a mobile device, but you can long-press.

In this recipe, you used the GestureDetector widget to select/deselect items in a GridView. You can use a GestureDetector both for touch screen gestures, such as swipes and long-presses, and for mouse gestures, such as right-click and scroll. 

To select items and add a light-blue background color, you used an onTap event:

onTap: () => setColor(Colors.lightBlue, index), 

onTap gets called both when the user taps with a finger on a touch screen and when they click on the main button of a mouse or stylus or any other pointing device. This is an example of a callback that works both on mobile and desktop.

To deselect an item, you used both onSecondaryTap and onLongPress:

onSecondaryTap: () => setColor(Colors.white, index...