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...

With the Dismissible widget, the Flutter framework makes the action of deleting an item in a ListView with the swiping gesture very easy.

You simply drag a Dismissible left or right (these are DismissDirections) and the selected item will slide out of view, with a nice-looking animation.

It works like this:

  • First, you set the key parameter. This allows the framework to uniquely identify the item that has been swiped, and it's a required parameter.
    In the example of this recipe, you created a new Key with the name of the sweets at the position that’s being created:
key: Key(sweets[index]),
  • Then, you set the onDismissed parameter. This is called when you swipe the item.
    In this example, we do not care about the direction of the swipe as we want to delete the item for both directions.
  • Inside the function, you just call the removeAt method on the sweets list to remove the item from the List.

The sweets list contains the names of the first 10 versions...