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 to do it...

This recipe is going to focus on taking some existing code and updating it to something more manageable. Open e_commerce_screen_before.dart and notice that the whole class is one single unbroken build method:

  1. The first thing we're going to do with this file is divide it up using a refactoring tool called extract method.
    Move your cursor over AppBar, right-click and select Refactor | Extract Method on VS Code or Refactor | Extract | Extract Method on Android Studio to open the extract dialog. Call the method _buildAppBar and press Enter:

  1. Perform an extract of the first Row widget in the Column widget using the same technique. Call this method _buildToggleBar().
  2. The next step is going to be a bit more tricky. Collapse the code for the two next rows by tapping the collapse icon just to the right of the line numbers: 

  1. With both rows collapsed, highlight the three SizedBox instances and the two...