Book Image

React Native Cookbook. - Second Edition

By : Daniel Ward
4 (1)
Book Image

React Native Cookbook. - Second Edition

4 (1)
By: Daniel Ward

Overview of this book

If you are a developer looking to create mobile applications with maximized code reusability and minimized cost, React Native is what you need. With this practical guide, you’ll be able to build attractive UIs, tackle common problems in mobile development, and achieve improved performance in mobile environments. This book starts by covering the common techniques for React Native customization and helps you set up your development platforms. Over the course of the book, you’ll work through a wide variety of recipes that help you create, style, and animate your apps with built-in React Native and custom third-party components. You’ll also develop real-world browser-based authentication, build a fully functional audio player, and integrate Google Maps in your apps. This book will help you explore different strategies for working with data, including leveraging the popular Redux library and optimizing your app’s dataflow. You’ll also learn how to write native device functionality for new and existing React Native projects and how app deployment works. By the end of this book, you'll be equipped with tips and tricks to write efficient code and have the skills to build full iOS and Android applications using React Native.
Table of Contents (17 chapters)

Reacting to changes in application state

The average mobile device user has several apps that they use on a regular basis. Ideally, along with the other social media apps, games, media players, and more, users will also be using your React Native app. Any specific user may spend a short time in each application because he or she multitasks. What if we wanted to react to when the user leaves our app and re-enters? We could use this as a chance to sync data with the server, or to tell the user that we're happy to see them return, or to politely ask for a rating on the app store.

This recipe will cover the basics of reacting to changes in the state of the application, which is to say reacting to when the app is in the foreground (active), background, or inactive.

For this recipe, let's create a new pure React Native app titled AppStateApp.

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