private void ShowBiometricPrompt()
{
var executor = ContextCompat.GetMainExecutor(Context);
var passwordStorage = new PasswordStorageManager(Context);
var callback = new AuthenticationCallback();
callback.Succeeded += (_, result) =>
{
string password;
try
{
password = passwordStorage.Fetch(result.CryptoObject.Cipher);
}
catch (Exception e)
{
Logger.Error(e);
Toast.MakeText(Context, Resource.String.genericError, ToastLength.Short);
return;
}
UnlockAttempted?.Invoke(this, password);
};
callback.Failed += delegate
{
FocusPasswordText();
};
callback.Errored += (_, result) =>
{
Toast.MakeText(Context, result.Message, ToastLength.Short).Show();
FocusPasswordText();
};
_prompt = new BiometricPrompt(this, executor, callback);
var promptInfo = new BiometricPrompt.PromptInfo.Builder()
.SetTitle(GetString(Resource.String.unlock))
.SetSubtitle(GetString(Resource.String.unlockBiometricsMessage))
.SetNegativeButtonText(GetString(Resource.String.cancel))
.SetConfirmationRequired(false)
.SetAllowedAuthenticators(BiometricManager.Authenticators.BiometricStrong)
.Build();
try
{
var cipher = passwordStorage.GetDecryptionCipher();
_prompt.Authenticate(promptInfo, new BiometricPrompt.CryptoObject(cipher));
}
catch (Exception e)
{
Logger.Error(e);
_canUseBiometrics = false;
_useBiometricsButton.Enabled = false;
FocusPasswordText();
}
}
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
var view = base.OnCreateView(inflater, container, savedInstanceState);
SetupToolbar(view, Resource.String.unlock);
_preferences = new PreferenceWrapper(Context);
_progressBar = view.FindViewById <ProgressBar>(Resource.Id.appBarProgressBar);
_passwordLayout = view.FindViewById <TextInputLayout>(Resource.Id.editPasswordLayout);
_passwordText = view.FindViewById <TextInputEditText>(Resource.Id.editPassword);
TextInputUtil.EnableAutoErrorClear(_passwordLayout);
_passwordText.EditorAction += (_, e) =>
{
if (e.ActionId == ImeAction.Done)
{
UnlockAttempted?.Invoke(this, _passwordText.Text);
}
};
_unlockButton = view.FindViewById <MaterialButton>(Resource.Id.buttonUnlock);
_unlockButton.Click += delegate
{
UnlockAttempted?.Invoke(this, _passwordText.Text);
};
if (_preferences.AllowBiometrics)
{
var biometricManager = BiometricManager.From(Context);
_canUseBiometrics = biometricManager.CanAuthenticate(BiometricManager.Authenticators.BiometricStrong) ==
BiometricManager.BiometricSuccess;
}
_useBiometricsButton = view.FindViewById <MaterialButton>(Resource.Id.buttonUseBiometrics);
_useBiometricsButton.Enabled = _canUseBiometrics;
_useBiometricsButton.Click += delegate
{
ShowBiometricPrompt();
};
if (_canUseBiometrics)
{
ShowBiometricPrompt();
}
else
{
FocusPasswordText();
}
return(view);
}
