Registration

public class SampleUiCallback extends Fido2UiCallback {
    @Override
    public void showAuthenticators(List<Fido2AuthenticatorInfo> authenticators, final AuthenticatorSelectionCallback callback) throws Fido2Exception {
        List<CharSequence> names = new ArrayList<>();
        for (Fido2AuthenticatorInfo info : authenticators) {
            names.add(info.getName());
        }

        // Display list of names or select in the app

        // Callback with the selected authenticator (by index)
        callback.onAuthenticatorSelected(0);

        // OR cancel
        callback.cancel();
    }

}

class SampleUiDelegate: TGFFido2UiDelegate {
    public func showAuthenticators(_ authenticatorList: [TGFFido2AuthenticatorInfo], operationInfo: TGFFido2OperationInfo, authenticatorSelectionHandler: @escaping (TGFFido2AuthenticatorInfo) -> Void, cancelHandler: @escaping () -> Void) {
        let names = authenticatorList.map { $0.name }

        // Display list of names or select in the app

        // Callback with the selected authenticator
        authenticatorSelectionHandler(authenticatorList[0])

        // OR cancel
        cancelHandler()
    }
}

// Create Fido2 Registration request with json String
Fido2Request fido2Request = Fido2Request.jsonText(jsonString);

// Setup an instance of Fido2RespondArgs, create all required ui callback required by Mobile FIDO SDK.
Fido2UiCallback uiCallback = new SampleFido2UiCallback(activity);
PasscodeAuthenticatorCallback passcodeAuthenticatorCallback = new SamplePinPadAuthenticatorCallback(activity);
BiometricAuthenticatorCallback biometricAuthenticatorCallback = new SampleBiometricAuthenticatorCallback();

Fido2RespondArgs args = new Fido2RespondArgs.Builder()
    .setFido2Request(fido2Request)
    .setUiCallback(uiCallback)
    .setPasscodeAuthenticatorCallback(passcodeAuthenticatorCallback)
    .setBiometricAuthenticatorCallback(biometricAuthenticatorCallback)
    .build();

// Create a Fido2Client
Fido2Client client = Fido2ClientFactory.createFido2Client(getApplicationContext());
client.setActivity(activity);

client.respondWithArgs(args, new Fido2ResponseCallback() {
  @Override
  public void onResponded(Fido2Response response) {
      ((SamplePinPadAuthenticatorCallback) passcodeAuthenticatorCallback).dismissPasscodeAuthenticatorDialog();
      // Pass FIDO response to respective FIDO service.
    }

  @Override
  public void onError(Fido2Exception exception) {
      ((SamplePinPadAuthenticatorCallback) passcodeAuthenticatorCallback).dismissPasscodeAuthenticatorDialog();
      // handle error
    }
}

// Create Fido2 Registration request with json String
let fidoRequest = try TGFFido2RequestFactory.request(jsonString)
// Setup an instance of TGFFido2RespondArgsBuilder,initialize all necessary UI delegates required by Mobile FIDO SDK.
let respondArgsBuilder = TGFFido2RespondArgsBuilder(request: fidoRequest, uiDelegate: clientConformer)
respondArgsBuilder.uiBiometricAuthenticatorDelegate = clientConformer
respondArgsBuilder.uiPasscodeAuthenticatorDelegate = clientConformer
respondArgsBuilder.passcodeAuthenticator = TGFPasscodeAuthenticator(delegate: clientConformer)
let respondArgs = respondArgsBuilder.respondArgs()

// Fetch a FIDO2 response.
fido2Client.respond(with: respondArgs) {(response, error) in
    if let error = error {
        // Handle error 
    } else {
        let responseString: String = response!.raw()
        // Pass FIDO response to respective FIDO service.
    }
}