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
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Implementing the friends list


Before we start implementing the friends list screen, we must first add a menu item to ActionBar in our application. Begin by creating a new menu folder within the Resources folder of our project. Next, create a new Android Layout file named ConversationsMenu.axml. Remove the default layout XML created, and replace it with the following:

<?xml version="1.0" encoding="utf-8"?> 
<menu xmlns:android="http://schemas.android.com/apk/res/android"> 
  <item android:id="@+id/addFriendMenu"
     android:text="Add Friend"
     android:showAsAction="ifRoom"/> 
</menu> 

We set up a root menu with one menu item inside it.

The following is a breakdown of what we set for the item in XML:

  • android:id: We will use this later in C# to reference the menu item with Resource.Id.addFriendMenu.

  • android:icon: This is an image resource to display for the menu item. We used a built-in Android one for a generic plus icon.

  • android:showAsAction...