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)
16
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Instead of using an asynchronous for loop, you can also leverage the listen method over a stream. To do that, perform the following steps:

  1. Remove or comment out the content of the changeColor method.
  2. Add the following code to the changeColor method:
     colorStream.getColors().listen((eventColor) {
setState(() {
bgColor = eventColor;
});
});
  1. Run the app. You'll notice that our app behaves just like before, changing the color of the screen each second. 

The main difference between listen and await for is that when there is some code after the loop, listen will allow the execution to continue, while await for stops the execution until the stream is completed. 

In this particular app, we never stop listening to the stream, but you should always close a stream when it has completed its tasks. In order to do that, you can use the close() method, as shown in the next recipe.