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

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There is no way to know exactly how long an asynchronous task might take, so it would be a good idea to give the user some feedback while the device is retrieving the current position, with a CircularProgressIndicator. What we want to achieve is to show the animation while the position is being retrieved, and as soon as the coordinates become available, hide the animation, and show the coordinates. We can achieve that with the following code in the build() method:

Widget build(BuildContext context) {
Widget myWidget;
if (myPosition == '') {
myWidget = CircularProgressIndicator();
} else {
myWidget = Text(myPosition);
return Scaffold(
appBar: AppBar(title: Text('Current Location')),
body: Center(child:myWidget),

If you cannot see the animation of the CircularProgressIndicator, it might mean your device is too fast: try purposely adding a delay before the Geolocator() call, with the instruction...