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

Consuming purchases


Some purchases are used to indicate additional features that are not initially available to the user. Other products are consumable products and only provide a once-off feature, which will have to be re-purchased to be re-used. These products are consumable products and only provide a once-off feature.

How to do it...

Some products are meant to be consumed, or exhausted, when used; the user is required to purchase them again before they can be reused:

  1. To consume a product, we pass the purchase to the ConsumePurchase() method:

    var success = billing.ConsumePurchase(purchase);
  2. We don't really require the Purchase instance but rather just the purchase token. When a product is purchased, we can just store the purchase token and use that:

    var token = purchase.PurchaseToken;
    var success = billing.ConsumePurchase(token);
  3. If the consumption is successful, we can use the return value, or make use of the OnPurchaseConsumed event:

    billing.OnPurchaseConsumed += (token) => {
      // consumed...