Chapter 3. Building a GPS Locator Application

In this chapter, we will delve deeper into code sharing. We will build a Xamarin.Forms application that integrates native GPS location services and Google Maps APIs. We will cover more content on IoC containers, the Xamarin.Forms.Maps library, and techniques for c-sharp async and background tasks.

Expected knowledge:

• Web services
• JSON
• Google Maps
• Google Geocoding APIs (it helps to have a Google Developer account)

In this chapter, you will learn the following:

• Core location and GPS
• Navigation with Xamarin.Forms
• Google Maps integration
• Integrating Google Maps with Xamarin.Forms.Maps
• Reactive extensions
• Core location with iOS and the CLLocationManager Library
• Android and the LocationManager
• Creating our Windows project
• Core location services with Windows Phone
• The Application class
• Web services and data contracts
• Integrating with a Google APIs
• Creating the Geocoding web service controller
• Newtonsoft.Json and Microsoft HTTP client libraries
• ModernHttpClient and client message handlers
• Feeding JSON data into the IObservable framework more reactive extensions
• Resource (RESX) files
• Using the Geocoding web server controller
• OnNavigatedTo and OnShow
• Pythagoras equirectangular projection