Xamarin Android - How to sign in Google Play Services? - xamarin.android

Question

I am trying to add Google Play Services to my Xamarin Android app.
I am using Play Games Services v2 SDK and trying to follow this tutorial from the Official documentation.
The Java code for signing in would be that:
GamesSignInClient gamesSignInClient = PlayGames.getGamesSignInClient(getActivity());
gamesSignInClient.isAuthenticated().addOnCompleteListener(isAuthenticatedTask -> {
boolean isAuthenticated =
(isAuthenticatedTask.isSuccessful() &&
isAuthenticatedTask.getResult().isAuthenticated());
if (isAuthenticated) {
// Continue with Play Games Services
} else {
// Disable your integration with Play Games Services or show a
// login button to ask players to sign-in. Clicking it should
// call GamesSignInClient.signIn().
}
});
How can I translate it to C#?
Anyone can help me please?
This is my best attempt, but I am getting an exception on SetJniIdentityHashCode method not implemented.
using Android.Gms.Games;
using Android.Gms.Tasks;
// ...
PlayGamesSdk.Initialize(this);
IGamesSignInClient gamesSignInClient = PlayGames.GetGamesSignInClient(this);
gamesSignInClient.IsAuthenticated().AddOnCompleteListener(
new OnCompleteListener()
);
// ...
public class OnCompleteListener : Java.Lang.Object, IOnCompleteListener
{
public void Disposed()
{
throw new NotImplementedException();
}
public void DisposeUnlessReferenced()
{
throw new NotImplementedException();
}
public void Finalized()
{
throw new NotImplementedException();
}
public void OnComplete(Task task)
{
//var isAuthenticated =
// (task.IsSuccessful &&
// ((????)task.Result).isAuthenticated())
//if (isAuthenticated)
//{
// // Continue with Play Games Services
//}
//else
//{
// // Disable your integration with Play Games Services or show a
// // login button to ask players to sign-in. Clicking it should
// // call GamesSignInClient.signIn().
//}
}
public void SetJniIdentityHashCode(int value)
{
throw new NotImplementedException();
}
public void SetJniManagedPeerState(JniManagedPeerStates value)
{
throw new NotImplementedException();
}
public void SetPeerReference(JniObjectReference reference)
{
throw new NotImplementedException();
}
}

Answer 1

I managed to get the authentication result in the following way, probably was just using the wrong references.
public class TaskCompleteListener : Java.Lang.Object, IOnCompleteListener
{
public void OnComplete(Android.Gms.Tasks.Task task)
{
var isAuthenticated = task.IsSuccessful &&
((AuthenticationResult)task.Result).IsAuthenticated;
if (isAuthenticated)
{
// Continue with Play Games Services
}
else
{
// Disable your integration with Play Games Services or show a
// login button to ask players to sign-in. Clicking it should
// call GamesSignInClient.signIn().
}
}
}