Step1BA.java

BiometricManager biometricManager = BiometricManager.from(this);
        switch (biometricManager.canAuthenticate(BiometricManager.Authenticators.BIOMETRIC_WEAK | BiometricManager.Authenticators.DEVICE_CREDENTIAL)) {
            case BiometricManager.BIOMETRIC_SUCCESS:
                Log.d("MY_APP_TAG", "App can authenticate using biometrics.");
                break;
            case BiometricManager.BIOMETRIC_ERROR_NO_HARDWARE:
                Log.e("MY_APP_TAG", "No biometric features available on this device.");
                b.biometricCardView.setVisibility(View.GONE);
                break;
            case BiometricManager.BIOMETRIC_ERROR_HW_UNAVAILABLE:
                Log.e("MY_APP_TAG", "Biometric features are currently unavailable.");
                b.biometricCardView.setVisibility(View.GONE);
                break;
            case BiometricManager.BIOMETRIC_ERROR_NONE_ENROLLED:
                // Prompts the user to create credentials that your app accepts.
                final Intent enrollIntent = new Intent(Settings.ACTION_BIOMETRIC_ENROLL);
                enrollIntent.putExtra(Settings.EXTRA_BIOMETRIC_AUTHENTICATORS_ALLOWED,BiometricManager.Authenticators.BIOMETRIC_WEAK | BiometricManager.Authenticators.DEVICE_CREDENTIAL);
                startActivityForResult(enrollIntent, IntentIntegrator.REQUEST_CODE);
                break;
        }