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...

In this example, we want to find the user location coordinates and show them on the screen as soon as they are ready. Getting the coordinates is an asynchronous operation that returns a Future. Follow these steps:

  1. Create a  new file called geolocation.dart in the lib folder of your project.
  2. Create a new stateful widget, called LocationScreen.
  3. In the State class of the Geolocation widget, add the code that shows the user their current position. The final result is shown here:
import 'package:flutter/material.dart';
import 'package:geolocator/geolocator.dart';

class LocationScreen extends StatefulWidget {
_LocationScreenState createState() => _LocationScreenState();

class _LocationScreenState extends State<LocationScreen> {
String myPosition = '';
void initState() {
getPosition().then((Position myPos) {
myPosition = 'Latitude: ' + myPos.latitude.toString() + ' - Longitude: ' + myPos...