Book Image

Xamarin 4.x Cross-Platform Application Development - Third Edition

By : Jonathan Peppers
Book Image

Xamarin 4.x Cross-Platform Application Development - Third Edition

By: Jonathan Peppers

Overview of this book

Xamarin is a leading cross-platform application development tool used by top companies such as Coca-Cola, Honeywell, and Alaska Airlines to build apps. Version 4 features significant updates to the platform including the release of Xamarin.Forms 2.0 and improvements have been made to the iOS and Android designers. Xamarin was acquired by Microsoft so it is now a part of the Visual Studio family. This book will show you how to build applications for iOS, Android, and Windows. You will be walked through the process of creating an application that comes complete with a back-end web service and native features such as GPS location, camera, push notifications, and other core features. Additionally, you’ll learn how to use external libraries with Xamarin and Xamarin.Forms to create user interfaces. This book also provides instructions for Visual Studio and Windows. This edition has been updated with new screenshots and detailed steps to provide you with a holistic overview of the new features in Xamarin 4.
Table of Contents (19 chapters)
Xamarin 4.x Cross-Platform Application Development - Third Edition
About the Author
About the Reviewer
Customer Feedback

Writing a mock web service

Many times when developing a mobile application, you may need to begin the development of your application before the real backend web service is available. To prevent the development from halting entirely, a good approach would be to develop a mock version of the service. This is also helpful when you need to write unit tests, or are waiting on another team to develop the backend for your app.

First, let's break down the operations our app will perform against a web server. The operations are as follows:

  1. Login with a username and password.

  2. Register a new account.

  3. Get the user's list of friends.

  4. Add friends by their usernames.

  5. Get a list of the existing conversations for the user.

  6. Get a list of messages in a conversation.

  7. Send a message.

Now let's define an interface that offers a method for each scenario. The method is as follows:

public interface IWebService 
  Task<User> Login(string userName, string password); 
  Task<User> Register...