Book Image

Xamarin Mobile Development for Android Cookbook

By : Matthew Leibowitz
Book Image

Xamarin Mobile Development for Android Cookbook

By: Matthew Leibowitz

Overview of this book

Xamarin is used by developers to write native iOS, Android, and Windows apps with native user interfaces and share code across multiple platforms not just on mobile devices, but on Windows, Mac OS X, and Linux. Developing apps with Xamarin.Android allows you to use and re-use your code and your skills on different platforms, making you more productive in any development. Although it’s not a write-once-run-anywhere framework, Xamarin provides native platform integration and optimizations. There is no middleware; Xamarin.Android talks directly to the system, taking your C# and F# code directly to the low levels. This book will provide you with the necessary knowledge and skills to be part of the mobile development era using C#. Covering a wide range of recipes such as creating a simple application and using device features effectively, it will be your companion to the complete application development cycle. Starting with installing the necessary tools, you will be guided on everything you need to develop an application ready to be deployed. You will learn the best practices for interacting with the device hardware, such as GPS, NFC, and Bluetooth. Furthermore, you will be able to manage multimedia resources such as photos and videos captured with the device camera, and so much more! By the end of this book, you will be able to create Android apps as a result of learning and implementing pro-level practices, techniques, and solutions. This book will ascertain a seamless and successful app building experience.
Table of Contents (20 chapters)
Xamarin Mobile Development for Android Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Protecting the content


When an app is published on Google Play, anyone can download and install it. This is great when the user has purchased the app. However, we need a way to prevent users from accessing the app if they have managed to get hold of the app without purchasing it.

Getting ready

Before we can add licensing to our app, we will need the app's public key from the Play Store app listing, which is created on the Google Play Developer Console (https://play.google.com/apps/publish).

How to do it...

One of the ways to prevent unauthorized access to our app's content is by adding Google Play licensing to our app. Then, when the app is launched, we can verify the user with Google Play.

The first thing that we will need to do before adding licensing to our app is to get the app's public key from Google Play:

  1. We need to copy the Base64-encoded public key from the console under the app's Services & APIs section:

    The public app license key

  2. Then, we will paste that key into our app. For testing...