protected override async Task <FingerprintAuthenticationResult> NativeAuthenticateAsync(AuthenticationRequestConfiguration authRequestConfig, CancellationToken cancellationToken)
{
if (string.IsNullOrWhiteSpace(authRequestConfig.Title))
{
throw new ArgumentException("Title must not be null or empty on Android.", nameof(authRequestConfig.Title));
}
if (!(CrossFingerprint.CurrentActivity is FragmentActivity))
{
throw new InvalidOperationException($"Expected current activity to be '{typeof(FragmentActivity).FullName}' but was '{CrossFingerprint.CurrentActivity?.GetType().FullName}'. " +
"You need to use AndroidX. Have you installed Xamarin.AndroidX.Migration in your Android App project!?");
}
try
{
var cancel = string.IsNullOrWhiteSpace(authRequestConfig.CancelTitle) ?
Application.Context.GetString(Android.Resource.String.Cancel) :
authRequestConfig.CancelTitle;
var handler = new AuthenticationHandler();
var builder = new BiometricPrompt.PromptInfo.Builder()
.SetTitle(authRequestConfig.Title)
.SetConfirmationRequired(authRequestConfig.ConfirmationRequired)
.SetDescription(authRequestConfig.Reason);
if (authRequestConfig.AllowAlternativeAuthentication)
{
// It's not allowed to allow alternative auth & set the negative button
builder = builder.SetDeviceCredentialAllowed(authRequestConfig.AllowAlternativeAuthentication);
}
else
{
builder = builder.SetNegativeButtonText(cancel);
}
var info = builder.Build();
var executor = Executors.NewSingleThreadExecutor();
var activity = (FragmentActivity)CrossFingerprint.CurrentActivity;
using var dialog = new BiometricPrompt(activity, executor, handler);
await using (cancellationToken.Register(() => dialog.CancelAuthentication()))
{
dialog.Authenticate(info);
var result = await handler.GetTask();
TryReleaseLifecycleObserver(activity, dialog);
return(result);
}
}
catch (Exception e)
{
return(new FingerprintAuthenticationResult
{
Status = FingerprintAuthenticationResultStatus.UnknownError,
ErrorMessage = e.Message
});
}
}
public void StopListening()
{
Kp2aLog.Log("Fingerprint: StopListening " + (_biometricPrompt != null ? " having prompt " : " without prompt"));
_biometricAuthCallbackAdapter?.IgnoreNextError();
_biometricPrompt?.CancelAuthentication();
}
public void StopListening()
{
_biometricAuthCallbackAdapter.IgnoreNextError();
_biometricPrompt.CancelAuthentication();
}
public override void Dismiss()
{
base.Dismiss();
_prompt?.CancelAuthentication();
}