Book Image

Mastering Xamarin UI Development - Second Edition

By : Steven F. Daniel
Book Image

Mastering Xamarin UI Development - Second Edition

By: Steven F. Daniel

Overview of this book

This book will provide you with the knowledge and practical skills that are required to develop real-world Xamarin and Xamarin.Forms applications. You’ll learn how to create native Android app that will interact with the device camera and photo gallery, and then create a native iOS sliding tiles game. You will learn how to implement complex UI layouts and create customizable control elements based on the platform, using XAML and C# 7 code to interact with control elements within your XAML ContentPages. You’ll learn how to add location-based features by to your apps by creating a LocationService class and using the Xam.Plugin.Geolocator cross-platform library, that will be used to obtain the current device location. Next, you’ll learn how to work with and implement animations and visual effects within your UI using the PlatformEffects API, using C# code. At the end of this book, you’ll learn how to integrate Microsoft Azure App Services and use the Twitter APIs within your app. You will work with the Razor Templating Engine to build a book library HTML5 solution that will use a SQLite.net library to store, update, retrieve, and delete information within a local SQLite database. Finally, you will learn how to write unit tests using the NUnit and UITest frameworks.
Table of Contents (15 chapters)

Updating the WalkDistancePage user unterface using XAML

In this section, we will update the user interface for our WalkDistancePage in order to modify our ToolbarItem, since we will need to display additional items when retrieving Twitter profile information and posting Tweets to the users Twitter feed. Within our code-behind file, we will use the DisplayActionSheet method to display a list of choices that the user can choose from so that they can retrieve profile information, post tweets, and end the current trail in progress.

Let's start by updating the user interface for our WalkDistancePage by performing the following steps:

  1. Locate and open the WalkDistancePage.xaml file, which is located within the Views folder, ensuring that it is displayed within the code editor, and enter the following highlighted code sections:
   <?xml version="1.0" encoding=&quot...