Mastering Xamarin.Forms - Second Edition

Creating a location service

The first step to allowing our app to take advantage of the device's geolocation capabilities, is to provide an interface in the core library that can be used by the ViewModels in a device- and platform-agnostic manner. When receiving the geolocation back from a device, each platform could potentially provide coordinates in a platform-specific data structure. However, each structure will ultimately provide two double values representing the coordinate's latitude and longitude.

There are a couple of ways to ensure that the results are returned in a platform-agnostic manner, which we will need since we are working in a non-platform-specific library.

One way to ensure this is to pass the values back via a callback ...