Open app from another app with Xamarin.Forms and MvvmCross UWP - xamarin

Question

Opening app from another app can be done like:
public async Task<bool> LaunchUriAsync(string objectNumber)
{
var option = new LauncherOptions();
option.UI.PreferredPlacement = Placement.Right;
option.DesiredRemainingView = ViewSizePreference.UseMore;
return await Launcher.LaunchUriAsync(buildObjectAccessUri(objectNumber), option);
}
private static Uri buildObjectAccessUri(string objectId)
{
return new Uri(String.Format("{0}://{1}/{2}", "myapp", "data", objectId), UriKind.Absolute);
}
in a Command I do:
await MyLauncherService.LaunchUriAsync("whatever");
and in opened application I have a custom start
public class CustomAppStart : MvxAppStart
{
protected override async Task NavigateToFirstViewModel(object hint = null)
{
// hint here is type of `Windows.ApplicationModel.Activation.ProtocolActivatedEventArgs`
}
}
Seems that object hint is type of Windows.ApplicationModel.Activation.ProtocolActivatedEventArgs
The App.xaml.cs of UWP project:
sealed partial class App
{
public App()
{
InitializeComponent();
}
}
public abstract class UwpApp : MvxApplication<Setup<Core.App>, Core.App>
{
private ILoggerService mLoggerService;
public UwpApp()
{
UnhandledException += (sender, args) =>
{
mLoggerService = Mvx.IoCProvider.Resolve<ILoggerService>();
if (mLoggerService == null)
{
return;
}
mLoggerService.Fatal("Unhandled exception!", args.Exception);
};
DebugSettings.BindingFailed += (sender, args) => Debug.WriteLine(args.Message);
TaskScheduler.UnobservedTaskException += (sender, args) =>
{
mLoggerService = Mvx.IoCProvider.Resolve<ILoggerService>();
if (mLoggerService == null)
{
return;
}
foreach (var ex in args.Exception.Flatten().InnerExceptions)
{
mLoggerService.Error(ex.Message + " StackTrace:" + ex.StackTrace);
}
args.SetObserved();
};
Suspending += OnSuspending;
ApplicationView.PreferredLaunchWindowingMode = ApplicationViewWindowingMode.Auto;
}
protected override void OnSuspending(object sender, SuspendingEventArgs e)
{
var deferral = e.SuspendingOperation.GetDeferral();
deferral.Complete();
}
}
Why I got that ?
I expected to be string ...
Where is the mistake ?
I'm using latest version of xamarin and mvvm cross

Answer 1

In your MvxApplication you can override GetAppStartHint to process the object coming into that method and return a string as you expect.
Something like:
public abstract class UwpApp : MvxApplication<Setup<Core.App>, Core.App>
{
protected override object GetAppStartHint(object hint = null)
{
// process hint
//return string
}
}