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...

The first step when using StreamBuilder is setting its stream property, and we did that with the following command:

stream: numberStream,

With the initialdata property, you can specify which data to show when the screen loads and before the first event is emitted.

 initialData: 0,

Then you write a builder. This is a function that takes the current context and a snapshot, which contains the data emitted by the stream, in the data property. Hence, this is triggered automatically each time Stream emits a new event, and new data is available. In our example, we check whether the snapshot contains some data with the help of the following command:

 if (snapshot.hasData) {...

If there is data in the snapshot, we show it in a Text:

return Center(
child: Text(,
style: TextStyle(fontSize: 96),

The snapshot hasError property allows you to check whether errors were returned. As usual, this is extremely...