Awesome

Version Tracking Plugin for Xamarin and Windows

Track which versions of your Xamarin.iOS, Xamarin.Mac, Xamarin.Android, or Windows app a user has previously installed.

Setup

Available on NuGet: https://www.nuget.org/packages/Plugin.VersionTracking/
Install into your PCL/.NET Standard project and Client projects.
(fuctionality is exposed through a built-in Singleton, no dependency service required)

Platform Support

Platform	Version
Xamarin.iOS	iOS 7+
Xamarin.Android	API 10+
Windows 10 UWP	10+
Xamarin.Mac	All

Supports both classic Xamarin.iOS / Xamarin.Android and Xamarin.Forms

API Usage

Call this on each app launch inside DidFinishLaunching (Xamarin.iOS), FinishedLaunching (Xamarin.Mac), or the MainActivity's OnCreate (Xamarin.Android)

CrossVersionTracking.Current.Track ();

Then call these whenever you want (in these examples the user has launched a bunch of previous versions, and this is the first time he's launched the new version 1.0.11):

var vt = CrossVersionTracking.Current;

vt.IsFirstLaunchEver;        // false
vt.IsFirstLaunchForVersion;  // true
vt.IsFirstLaunchForBuild;    // true

vt.CurrentVersion;           // 1.0.11
vt.PreviousVersion;          // 1.0.10
vt.FirstInstalledVersion;    // 1.0.0
vt.VersionHistory;           // [ 1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.0.10, 1.0.11 ]

vt.CurrentBuild;             // 18
vt.PreviousBuild;            // 15
vt.FirstInstalledBuild;      // 1
vt.BuildHistory;             // [ 1, 2, 3, 4, 5, 8, 9, 10, 11, 13, 15, 18 ]

Or set up actions to be called on the first lauch of a specific version or build:

var vt = CrossVersionTracking.Current;

vt.OnFirstLaunchOfBuild ("18", () => Console.WriteLine ("First time Build 18 launched!"));
vt.OnFirstLaunchOfVersion ("1.0.11", () => Console.WriteLine ("First time Version 1.0.11 launched!"));

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