private async Task <bool> Authenticate()
{
var callback = new SimpleAuthCallbacks();
var context = Android.App.Application.Context;
var isUsingFingerprint = ContextCompat.CheckSelfPermission(context, Manifest.Permission.UseFingerprint);
if (isUsingFingerprint == Permission.Granted)
{
var cancellationSignal = new Android.Support.V4.OS.CancellationSignal();
var cryptHelper = new CryptoObjectHelper();
var fingerprintManager = FingerprintManagerCompat.From(context);
fingerprintManager.Authenticate(
cryptHelper.BuildCryptoObject(),
(int)FingerprintAuthenticationFlags.None, /* flags */
cancellationSignal,
callback,
null
);
}
while (callback.IsWaiting)
{
await Task.Delay(87);
}
return(callback.Status == SimpleAuthCallbacks.AuthenticateResult.Success);
}
public void AuthenticateAndroid(string reason)
{
// CryptoObjectHelper is described in the previous section.
var cryptoHelper = new CryptoObjectHelper();
var context = Android.App.Application.Context;
//if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.M)
//{
// /* ==================================================================================================
// * android api 23 or higher
// * ================================================================================================*/
// var manager = context.GetSystemService(Context.FingerprintService) as FingerprintManager;
// // cancellationSignal can be used to manually stop the fingerprint scanner.
// var cancellationSignal = new Android.OS.CancellationSignal();
// var authenticationCallback = new SimpleAuthCallback();
// // Start the fingerprint scanner.
// manager.Authenticate(cryptoHelper.BuildCryptoObject(), cancellationSignal, FingerprintAuthenticationFlags.None, authenticationCallback, null);
// return;
//}
// Using the Android Support Library v4
var managerCompat = FingerprintManagerCompat.From(context);
// cancellationSignal can be used to manually stop the fingerprint scanner.
var cancellationSignalCompat = new Android.Support.V4.OS.CancellationSignal();
// AuthenticationCallback is a base class that will be covered later on in this guide.
var callbackCompat = new SimpleCompatAuthCallback();
// Start the fingerprint scanner.
managerCompat.Authenticate(cryptoHelper.BuildCompatCryptoObject(), 0, cancellationSignalCompat, callbackCompat, null);
//return new LocalAuthResult(false);
//return Task.FromResult(new LocalAuthResult(false));
}
public void Authenticate(Action successAction, Action failAction)
{
FingerprintManagerCompat fingerprintManager = FingerprintManagerCompat.From(Android.App.Application.Context);
const int flags = 0; /* always zero (0) */
CryptoObjectHelper cryptoHelper = new CryptoObjectHelper();
// Using the Support Library classes for maximum reach
FingerprintManagerCompat fingerPrintManager = FingerprintManagerCompat.From(Android.App.Application.Context);
// AuthCallbacks is a C# class defined elsewhere in code.
FingerprintManagerCompat.AuthenticationCallback authenticationCallback = new AuthenticationCallBack();
var page = new FingerprintAuthenticationPage((int)Android.OS.Build.VERSION.SdkInt);
Xamarin.Forms.Application.Current.MainPage.Navigation.PushPopupAsync(page);
MessagingCenter.Subscribe <string, string>("FingerprintAuthentication", "Authenticate", (sender, arg) =>
{
string result = arg;
if (arg == "true")
{
MessagingCenter.Unsubscribe <string, string>("FingerprintAuthentication", "Authenticate");
Device.BeginInvokeOnMainThread(() =>
{
Xamarin.Forms.Application.Current.MainPage.Navigation.PopPopupAsync();
});
//Do the thing when success to pass
if (successAction != null)
{
successAction.Invoke();
}
}
else if (arg == "false")
{
Device.BeginInvokeOnMainThread(() =>
{
page.SetFailLabelText("Fail to authenticate!");
});
}
else
{
MessagingCenter.Unsubscribe <string, string>("FingerprintAuthentication", "Authenticate");
Device.BeginInvokeOnMainThread(() =>
{
Xamarin.Forms.Application.Current.MainPage.Navigation.PopPopupAsync();
});
//Do the thing when fail to pass
if (failAction != null)
{
failAction.Invoke();
}
}
});
cancellationSignal = new Android.Support.V4.OS.CancellationSignal();
// Here is where the CryptoObjectHelper builds the CryptoObject.
fingerprintManager.Authenticate(cryptoHelper.BuildCryptoObject(), flags, cancellationSignal, authenticationCallback, null);
}
public FingerprintDialog(DialogConfiguration dialogConfiguration, FingerprintManagerCompat.AuthenticationCallback authenticationCallBack, Android.Support.V4.OS.CancellationSignal fingerprintCancellationSignal)
{
_dialogConfiguration = dialogConfiguration;
_authenticationCallBack = authenticationCallBack;
_fingerprintCancellationSignal = fingerprintCancellationSignal;
((AuthenticationCallBack)_authenticationCallBack).SetFingerprintDialog(this);
}
public override void OnAuthenticationError(int errMsgId, ICharSequence errString)
{
bool reportError = (errMsgId == (int)FingerprintState.ErrorCanceled);
string debugMsg = $"OnAuthenticationError: {errMsgId}:`{errString}`.";
if (reportError)
{
debugMsg += (errMsgId, errString.ToString());
debugMsg += " Reporting the error.";
}
else
{
debugMsg += " Ignoring the error.";
}
Console.WriteLine(debugMsg);
if (_tcsWeak.TryGetTarget(out var tcs))
{
tcs.TrySetResult(new AuthenticationResult(false, debugMsg));
}
_cancellationSignal?.Cancel();
_cancellationSignal?.Dispose();
_cancellationSignal = null;
_dialog.Dismiss();
}
public void GetFingerprint(EventHandler evt, bool encrypt, byte[] data)
{
//make sure the device is secured
KeyguardManager keyguardManager = (KeyguardManager)Application.Context.GetSystemService(Context.KeyguardService);
if (!keyguardManager.IsKeyguardSecure)
{
return;
}
//make sure fingerprints are enrolled
if (!m_fingerprintManager.HasEnrolledFingerprints)
{
return;
}
//check permissions
Android.Content.PM.Permission permissionResult = ContextCompat.CheckSelfPermission(Application.Context, Manifest.Permission.UseFingerprint);
if (permissionResult != Android.Content.PM.Permission.Granted)
{
return;
}
m_evt = evt;
m_data = data;
m_mode = encrypt ? CipherMode.EncryptMode : CipherMode.DecryptMode;
CryptoObjectHelper cryptoHelper = new CryptoObjectHelper();
cancellationSignal = new Android.Support.V4.OS.CancellationSignal();
//prompt user to scan their fingerprint
m_fingerprintManager.Authenticate(cryptoHelper.BuildCryptoObject(m_mode), 0, cancellationSignal, this, null);
}
internal void CancelAuthentication()
{
cancellationSignal?.Cancel();
newCancelSignal?.Cancel();
newCancelSignal = null;
cancellationSignal = null;
}
private void LogUserIn()
{
var cancellation = new Android.Support.V4.OS.CancellationSignal();
FingerprintManagerCompat.AuthenticationCallback authenticationCallback = new AuthenticationCallback(this, userId);
Toast.MakeText(this, "Поднесите палец к сенсору", ToastLength.Long).Show();
fingerprintManager.Authenticate(null, 0, cancellation, authenticationCallback, null);
}
/// <summary>
/// Stops the authentication.
/// </summary>
public void StopAuthentication()
{
if (mCancellationSignal != null)
{
mCancellationSignal.Cancel();
mCancellationSignal = null;
}
}
protected void CancelledDialogDelegate(object sender, DialogClickEventArgs e)
{
if (_tcsWeak.TryGetTarget(out var tcs))
{
tcs.TrySetResult(new AuthenticationResult(false, "Biometric authentication scan was cancelled"));
}
_cancellationSignal?.Cancel();
_cancellationSignal = null;
}
public SimpleAuthCallbacks(
IDialogInterface dialog,
WeakReference <TaskCompletionSource <AuthenticationResult> > tcsWeak,
CancellationSignal cancellationSignal)
{
_dialog = dialog;
_tcsWeak = tcsWeak;
_cancellationSignal = cancellationSignal ?? new CancellationSignal();
}
internal FingerprintManagerFragment(string alertTitle, string alertMessage, TaskCompletionSource <AuthenticationResult> tcs)
{
_fingerprintManager = FingerprintManagerCompat.From(MainApplication.CurrentActivity);
_alertTitle = alertTitle;
_alertMessage = alertMessage;
_cryptObjectHelper = new CryptoObjectHelper();
_cancellationSignal = new CancellationSignal();
_tcsWeak = new WeakReference <TaskCompletionSource <AuthenticationResult> >(tcs);
}
void StopListeningForFingerprints(bool butStartListeningAgainInOnResume = false)
{
if (cancellationSignal != null)
{
cancellationSignal.Cancel();
cancellationSignal = null;
}
ScanForFingerprintsInOnResume = butStartListeningAgainInOnResume;
}
void StopListeningForFingerprints(bool butStartListeningAgainInOnResume = false)
{
if (_cancellationSignal != null)
{
_cancellationSignal.Cancel();
_cancellationSignal = null;
Log.Debug(TAG, "StopListeningForFingerprints: _cancellationSignal.Cancel();");
}
ScanForFingerprintsInOnResume = butStartListeningAgainInOnResume;
}
public override async Task <SecureFingerprintAuthenticationResult> AuthenticateSecureNoDialogAsync(IAuthenticationFailedListener failedListener, string key, CancellationToken cancellationToken)
{
using (var cancellationSignal = new Android.Support.V4.OS.CancellationSignal())
using (cancellationToken.Register(() => cancellationSignal.Cancel()))
{
CryptoObjectHelper crypto = new CryptoObjectHelper();
var callback = new SecureFingerprintAuthenticationCallback(failedListener, key);
GetServiceCompat().Authenticate(crypto.BuildCryptoObject(), (int)FingerprintAuthenticationFlags.None, cancellationSignal, callback, null);
return(await callback.GetTask());
}
}
public override void OnResume()
{
base.OnResume();
if (!ScanForFingerprintsInOnResume)
{
return;
}
UserCancelledScan = false;
_cancellationSignal = new CancellationSignal();
_fingerprintManager.Authenticate(CryptObjectHelper.BuildCryptoObject(),
(int)FingerprintAuthenticationFlags.None, /* flags */
_cancellationSignal,
new SimpleAuthCallbacks(this),
null);
}
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
Xamarin.Essentials.Platform.Init(this, savedInstanceState);
fingerprintManager = FingerprintManagerCompat.From(this);
cancellation = new Android.Support.V4.OS.CancellationSignal();
preferences = Application.Context.GetSharedPreferences("UserInfo", FileCreationMode.Private);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.Main);
emailEditText = FindViewById <EditText>(Resource.Id.emailEditText);
passwordEditText = FindViewById <EditText>(Resource.Id.passwordEditText);
signinButton = FindViewById <Button>(Resource.Id.signinButton);
registerButton = FindViewById <Button>(Resource.Id.registerButton);
signinButton.Click += SigninButton_Click;
registerButton.Click += RegisterButton_Click;
}
public Task <bool> Scan()
{
tcs = new TaskCompletionSource <bool>();
var Context = Android.App.Application.Context;
// Using the Android Support Library v4
FingerprintManagerCompat fingerprintManager = FingerprintManagerCompat.From(Context);
if (!fingerprintManager.IsHardwareDetected)
{
Toast.MakeText(Context, "FingerPrint authentication permission not enable", ToastLength.Short).Show();
tcs.SetResult(false);
return(tcs.Task);
}
if (!fingerprintManager.HasEnrolledFingerprints)
{
Toast.MakeText(Context, "Register at least one fingerprint in Settings", ToastLength.Short).Show();
}
else
{
const int flags = 0; /* always zero (0) */
// CryptoObjectHelper is described in the previous section.
CryptoObjectHelper cryptoHelper = new CryptoObjectHelper();
// cancellationSignal can be used to manually stop the fingerprint scanner.
var cancellationSignal = new Android.Support.V4.OS.CancellationSignal();
// AuthenticationCallback is a base class that will be covered later on in this guide.
//FingerprintManagerCompat.AuthenticationCallback authenticationCallback = new MyAuthCallbackSample(this);
// Start the fingerprint scanner.
fingerprintManager.Authenticate(cryptoHelper.BuildCryptoObject(), flags, cancellationSignal, this, null);
Toast.MakeText(Context, "Put your finger to scan", ToastLength.Short).Show();
}
return(tcs.Task);
}
public void fingerPrintDetection(Activity context)
{
// Using the Android Support Library v4
FingerprintManagerCompat fingerprintManager = FingerprintManagerCompat.From(context);
if (fingerprintManager.IsHardwareDetected)
{
if (fingerprintManager.HasEnrolledFingerprints)
{
// The context is typically a reference to the current activity.
Android.Content.PM.Permission permissionResult = ContextCompat.CheckSelfPermission(context, Manifest.Permission.UseFingerprint);
if (permissionResult == Android.Content.PM.Permission.Granted)
{
// Permission granted - go ahead and start the fingerprint scanner.
CryptoObjectHelper cryptoHelper = new CryptoObjectHelper();
var cancellationSignal = new Android.Support.V4.OS.CancellationSignal();
// AuthCallbacks is a C# class defined elsewhere in code.
FingerprintManagerCompat.AuthenticationCallback authenticationCallback = new SimpleAuthCallbacks(context);
// Here is where the CryptoObjectHelper builds the CryptoObject.
fingerprintManager.Authenticate(cryptoHelper.BuildCryptoObject(), (int)FingerprintAuthenticationFlags.None, cancellationSignal, authenticationCallback, null);
}
else
{
// No permission. Go and ask for permissions and don't start the scanner. See
// http://developer.android.com/training/permissions/requesting.html
}
}
else
{
//user has not enrolled for fingerprint
}
}
else
{
//Device is not compatible for fingerprint scanning
}
}
public void Authenticate(string userId, Action onSuccess, Action onFailure)
{
OnSuccess = onSuccess;
OnFailure = onFailure;
if (IsBiometricPromptEnabled)
{
newCancelSignal = new Android.OS.CancellationSignal();
prompt = new BiometricPrompt.Builder(CrossCurrentActivity.Current.Activity)
.SetTitle("ManageGo")
.SetSubtitle("Fingerprint Login")
.SetDescription($"Place finger on the home button to log in as {userId}")
.SetNegativeButton("CANCEL", CrossCurrentActivity.Current.Activity.MainExecutor,
new DialogListener(this)).Build();
prompt.Authenticate(newCancelSignal, CrossCurrentActivity.Current.Activity.MainExecutor, new BiometricCallback(this));
}
else
{
cancellationSignal = new Android.Support.V4.OS.CancellationSignal();
var callback = new SimpleAuthCallbacks(this);
FingerprintManager.Authenticate(null, 0, cancellationSignal, callback, null);
}
}
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
// Set our view from the "FingerprintAuthorization" layout resource
SetContentView(Resource.Layout.FingerprintAuthorization);
sharedPreferences = PreferenceManager.GetDefaultSharedPreferences(this);
fingerprintManagerCompat = FingerprintManagerCompat.From(this);
cancelationSignal = new Android.Support.V4.OS.CancellationSignal();
fingerprintStatusTextView = FindViewById <TextView>(Resource.Id.tvFingerprintStatusTextView);
buttonAuthenticate = FindViewById <Button>(Resource.Id.buttonFingerPrintAuthenticate);
buttonReset = FindViewById <Button>(Resource.Id.buttonFingerPrintReset);
FindViewById <ProgressBar>(Resource.Id.pbFingerprintAuthenticationProgressBar).Visibility = ViewStates.Invisible;
buttonAuthenticate.Click += (sender, e) => {
// Implementation
FindViewById <ProgressBar>(Resource.Id.pbFingerprintAuthenticationProgressBar).Visibility = ViewStates.Visible;
if (CanUseFingerprintBiometric())
{
LogUserIn();
}
else
{
FindViewById <ProgressBar>(Resource.Id.pbFingerprintAuthenticationProgressBar).Visibility = ViewStates.Invisible;
Toast.MakeText(this, "This device is not configured for Fingerprint Biometrics", ToastLength.Long).Show();
}
};
buttonReset.Click += (sender, e) => {
// Implementation
FindViewById <ProgressBar>(Resource.Id.pbFingerprintAuthenticationProgressBar).Visibility = ViewStates.Invisible;
fingerprintStatusTextView.Text = "You Must Authenticate";
};
}
/// <summary>
/// Starts the authentication.
/// </summary>
public void StartAuthentication()
{
// Stop any previous scan.
StopAuthentication();
if (!InternalIsFingerprintAvailable())
{
return;
}
try
{
mCancellationSignal = new CancellationSignal();
_fingerprintManager.Authenticate(CryptoObjectBuilder.Build(),
(int)FingerprintAuthenticationFlags.None,
mCancellationSignal,
new AuthenticationCallbacks(this),
null);
}
catch (Exception ex)
{
_authenticationCallback.AuthenticationError(AuthenticationErrorCodes.Unexpected, ex.Message);
}
}
public void Authenticate(byte[] secret, FingerprintSignOp operation)
{
const int flags = 0; /* Sempre zero */
if (!IsReady())
{
throw new Exception(Resources.GetString(Resource.String.errFpNotRead));
}
// Estrae l'initialization vector
byte[] iv = new byte[] { };
if (operation == FingerprintSignOp.Decrypt)
{
string data = System.Text.Encoding.UTF8.GetString(secret);
string[] base64Data = data.Split(new char[] { ';' });
if (base64Data.Length < 2)
{
throw new Exception("Invalid data");
}
secret = Convert.FromBase64String(base64Data[0]);
iv = Convert.FromBase64String(base64Data[1]);
}
// Oggetto per la verifica dell'integrità dell'impronta digitale
CurrentOperation = operation;
CryptoObjectHelper cryptoHelper = new CryptoObjectHelper(operation == FingerprintSignOp.Crypt ? CipherMode.EncryptMode : CipherMode.DecryptMode, iv);
// Segnale per la cancellazione manuale della lettura dell'impronta
FingerprintCancel = new Android.Support.V4.OS.CancellationSignal();
// Oggetto per la gestione della callback di autenticazione
FingerprintManagerCompat.AuthenticationCallback authenticationCallback = new FingerprintAuthCallback(this, secret);
// Avvia lo scanner
FingerprintManager.Authenticate(cryptoHelper.BuildCryptoObject(), flags, FingerprintCancel, authenticationCallback, null);
}
public override void OnResume()
{
base.OnResume();
if (!ScanForFingerprintsInOnResume)
{
return;
}
UserCancelledScan = false;
_cancellationSignal = new CancellationSignal();
_fingerprintManager.Authenticate(CryptObjectHelper.BuildCryptoObject(),
(int) FingerprintAuthenticationFlags.None, /* flags */
_cancellationSignal,
new SimpleAuthCallbacks(this),
null);
}
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);
}
}
}
public Fingerprint()
{
m_ready = false;
cancellationSignal = null;
m_mode = CipherMode.EncryptMode;
}
void StopListeningForFingerprints(bool butStartListeningAgainInOnResume = false)
{
if (_cancellationSignal != null)
{
_cancellationSignal.Cancel();
_cancellationSignal = null;
Log.Debug(TAG, "StopListeningForFingerprints: _cancellationSignal.Cancel();");
}
ScanForFingerprintsInOnResume = butStartListeningAgainInOnResume;
}
