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 content providers


The most common way for apps to share structured data is to use content providers. These providers present data in a table-like form for easy consumption.

Getting ready...

If we are targeting an Android version earlier than 3.0, we will need to add the Xamarin Android Support v4 NuGet package.

How to do it...

Content providers give us a way to access data from other apps and services on the device. Here, we will view the contacts through an Android content provider. Let's take a look at the following steps:

  1. As we are going to access the contacts, we have to request permission to do so:

    [assembly: UsesPermission(
      Manifest.Permission.ReadContacts)]
  2. Now that we have the permission, we will need a URI that directs us to the contact content provider:

    string uri = ContactsContract.Contacts.ContentUri;
  3. Next, we will request the contact ID and the display name using the column constants. There are several columns that can be selected, and we can request any combination of them...