public Task <bool> AuthenticateBiometricAsync(string text = null)
{
if (string.IsNullOrWhiteSpace(text))
{
text = AppResources.BiometricsDirection;
}
var activity = (MainActivity)CrossCurrentActivity.Current.Activity;
using (var builder = new BiometricPrompt.Builder(activity))
{
builder.SetTitle(text);
builder.SetConfirmationRequired(false);
builder.SetNegativeButton(AppResources.Cancel, activity.MainExecutor,
new DialogInterfaceOnClickListener
{
Clicked = () => { }
});
var prompt = builder.Build();
var result = new TaskCompletionSource <bool>();
prompt.Authenticate(new CancellationSignal(), activity.MainExecutor,
new BiometricAuthenticationCallback
{
Success = authResult => result.TrySetResult(true),
Failed = () => result.TrySetResult(false),
Help = (helpCode, helpString) => { }
});
return(result.Task);
}
}
public static async System.Threading.Tasks.Task Authenticate(DialogConfiguration dialogConfiguration)
{
//Android 10+ Q SdkInt 29+
if ((int)Build.VERSION.SdkInt >= 29)
{
CancellationSignal BiometricCancellationSignal = new CancellationSignal();
//Android 10
BiometricCancellationSignal = new CancellationSignal();
BiometricPrompt biometricPrompt;
if (dialogConfiguration.IsUseAlternativeAuthentication)
{
//Allow using PIN / Passcode as alternative, will disable crypto in authentication
biometricPrompt = new BiometricPrompt
.Builder(Configuration.CurrentActivity)
.SetTitle(dialogConfiguration.DialogTitle)
.SetDescription(dialogConfiguration.DialogDescription)
.SetDeviceCredentialAllowed(true)
.Build();
}
else
{
biometricPrompt = new BiometricPrompt
.Builder(Configuration.CurrentActivity)
.SetTitle(dialogConfiguration.DialogTitle)
.SetDescription(dialogConfiguration.DialogDescription)
.SetNegativeButton(dialogConfiguration.AlternativeActionMessage, Configuration.CurrentActivity.MainExecutor, new NegativeButtonOnClickListener(() =>
{
BiometricCancellationSignal.Cancel();
dialogConfiguration.AlternativeAction?.Invoke();
}))
.Build();
}
BiometricPrompt.AuthenticationCallback authenticationCallback = new BiometricAuthenticationCallback();
AuthenticationResult = null;
AuthenticationResult = (arg) =>
{
string result = arg;
if (arg == SystemMessages.Success)
{
BiometricCancellationSignal.Cancel();
dialogConfiguration.SuccessAction?.Invoke();
}
else if (arg == SystemMessages.Error)
{
BiometricCancellationSignal.Cancel();
dialogConfiguration.FailedAction?.Invoke();
}
};
if (dialogConfiguration.IsUseAlternativeAuthentication)
{
//Secret key is not allowed to use when SetDeviceCredentialAllowed is true
biometricPrompt.Authenticate(BiometricCancellationSignal, Configuration.CurrentActivity.MainExecutor, authenticationCallback);
}
else
{
if (Configuration.IsUseSecretKey)
{
CryptoObjectHelper cryptoHelper = new CryptoObjectHelper();
biometricPrompt.Authenticate(cryptoHelper.BuildBiometricPromptCryptoObject(), BiometricCancellationSignal, Configuration.CurrentActivity.MainExecutor, authenticationCallback);
}
else
{
biometricPrompt.Authenticate(BiometricCancellationSignal, Configuration.CurrentActivity.MainExecutor, authenticationCallback);
}
}
}
//Android 9+ P SdkInt 28
else if ((int)Build.VERSION.SdkInt >= 28)
{
//Android 9
try
{
CancellationSignal BiometricCancellationSignal = new CancellationSignal();
BiometricPrompt biometricPrompt;
biometricPrompt = new BiometricPrompt
.Builder(Configuration.CurrentActivity)
.SetTitle(dialogConfiguration.DialogTitle)
.SetDescription(dialogConfiguration.DialogDescription)
.SetNegativeButton(dialogConfiguration.AlternativeActionMessage, Configuration.CurrentActivity.MainExecutor, new NegativeButtonOnClickListener(() =>
{
BiometricCancellationSignal.Cancel();
dialogConfiguration.AlternativeAction?.Invoke();
}))
.Build();
BiometricCancellationSignal = new CancellationSignal();
BiometricPrompt.AuthenticationCallback authenticationCallback = new BiometricAuthenticationCallback();
AuthenticationResult = null;
AuthenticationResult = (arg) =>
{
string result = arg;
if (arg == SystemMessages.Success)
{
BiometricCancellationSignal.Cancel();
dialogConfiguration.SuccessAction?.Invoke();
}
else if (arg == SystemMessages.Error)
{
BiometricCancellationSignal.Cancel();
dialogConfiguration.FailedAction?.Invoke();
}
};
if (Configuration.IsUseSecretKey)
{
CryptoObjectHelper cryptoHelper = new CryptoObjectHelper();
biometricPrompt.Authenticate(cryptoHelper.BuildBiometricPromptCryptoObject(), BiometricCancellationSignal, Configuration.CurrentActivity.MainExecutor, authenticationCallback);
}
else
{
biometricPrompt.Authenticate(BiometricCancellationSignal, Configuration.CurrentActivity.MainExecutor, authenticationCallback);
}
}
catch (Exception ex)
{
Configuration.CurrentActivity.RunOnUiThread(() =>
{
Toast.MakeText(Configuration.CurrentActivity, $"Throw exception : {ex.Message}", ToastLength.Long).Show();
});
}
}
//Android 6+ to 8.x SdkInt 23
else if ((int)Build.VERSION.SdkInt >= 23)
{
//Android 6+ to 8.x
FingerprintManagerCompat fingerprintManager = FingerprintManagerCompat.From(Configuration.CurrentActivity);
const int flags = 0; /* always zero (0) */
CryptoObjectHelper cryptoHelper = new CryptoObjectHelper();
// Using the Support Library classes for maximum reach
FingerprintManagerCompat fingerPrintManager = FingerprintManagerCompat.From(Configuration.CurrentActivity);
// AuthCallbacks is a C# class defined elsewhere in code.
Android.Support.V4.OS.CancellationSignal FingerprintCancellationSignal = new Android.Support.V4.OS.CancellationSignal();
FingerprintManagerCompat.AuthenticationCallback authenticationCallback = new AuthenticationCallBack();
Android.Support.V4.App.FragmentTransaction transcation = ((FragmentActivity)Configuration.CurrentActivity).SupportFragmentManager.BeginTransaction();
FingerprintDialog fingerprintDialog = new FingerprintDialog(dialogConfiguration, authenticationCallback, FingerprintCancellationSignal);
fingerprintDialog.Show(transcation, "Dialog Fragment");
AuthenticationResult = null;
AuthenticationResult = (arg) =>
{
string result = arg;
if (arg == SystemMessages.Success)
{
FingerprintCancellationSignal.Cancel();
dialogConfiguration.SuccessAction?.Invoke();
}
else if (arg == SystemMessages.Error)
{
FingerprintCancellationSignal.Cancel();
dialogConfiguration.FailedAction?.Invoke();
}
};
try
{
fingerprintManager.Authenticate(cryptoHelper.BuildFingerprintManagerCompatCryptoObject(), flags, FingerprintCancellationSignal, authenticationCallback, null);
}
catch (Exception ex)
{
Toast.MakeText(Configuration.CurrentActivity, $"Throw exception : {ex.Message}", ToastLength.Long);
}
}
}
