Greetings!
I'm new to Xamarin but i had a quite good start, and so far, (almost) everything runs really well.
I wanted to integrate ACR User Dialogs to have a solid dialog service on board (for example for calling dialogs in view models).
So i installed Acr.UserDialogs v6.5.1 via NuGet in both Android and iOS projects (its referenced correctly in both projects)
I registered the Acr package in the android MainActivity, like mentioned in the Github doc:
public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
protected override void OnCreate(Bundle bundle)
{
TabLayoutResource = Resource.Layout.Tabbar;
ToolbarResource = Resource.Layout.Toolbar;
base.OnCreate(bundle);
UserDialogs.Init(this);
global::Xamarin.Forms.Forms.Init(this, bundle);
LoadApplication(new App());
}
}
I cleaned and rebuild everything, but i'm still unable to call the user dialog.
For debugging purpose (called from a command)
void CheckConnection()
{
try
{
UserDialogs.Instance.Alert("Foo", "Bar");
} catch (Exception ex)
{
Console.Write(ex.Message);
}
}
The exception message:
[Acr.UserDialogs] In android, you must call UserDialogs.Init(Activity) from your first activity OR UserDialogs.Init(App) from your custom application OR provide a factory function to get the current top activity via UserDialogs.Init(() => supply top activi...
I don't have a clue why the dialog service is not working.
I already tried differenct positions for calling the UserDialog init, and already the different init call UserDialogs.Init(() => (Activity)Forms.Context).
But still - the dialog crashes.
I'm testing everything via Xamarin Live Player.
Any help would be much appreciated!
Edit: I found this issue on Github (Issue 449, i can't post links in this forum because i'm to new ...) Sounds like Xamarin Live Player can't handle this package, so what can i do? 
Greetings!
Niklas