I can't proceed Beyond the fingerprint

[Pey-crypto]

java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.hardware.fingerprint.FingerprintManager.hasEnrolledFingerprints()' on a null object reference

The app had no problems running in a biometric phone but has problems running in a non-biometric phone

[aghanti7]

Same problem here. There are (unfortunately) some new Android phones which have only face unlock and no fingerprint hardware. Would love to fallback to phone pin in such cases.

[Pey-crypto]

Actually kinda weird...i just read AuthenticationHelper.java. The code does utilize androidx.biometric.BiometricPrompt, but I noticed that the fallback has not been set in promptInfo in the else statement

Adding .setDeviceCredentialAllowed(true) in else statement might fix the problem...but this is not even a solution

[Pey-crypto]

`//` API 23 - 28 with fingerprint
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
  FingerprintManager fingerprintManager = (FingerprintManager) context
      .getSystemService(Context.FINGERPRINT_SERVICE);
  if (fingerprintManager.hasEnrolledFingerprints()) {
    authHelper = new AuthenticationHelper(lifecycle, (FragmentActivity) activity, call, completionHandler,
        false);
    authHelper.authenticate();
    return;
  }
}

// API 23 or higher with device credentials
KeyguardManager keyguardManager = (KeyguardManager) context.getSystemService(KEYGUARD_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && keyguardManager.isDeviceSecure()) {
  String title = call.argument("signInTitle");
  String reason = call.argument("localizedReason");
  Intent authIntent = keyguardManager.createConfirmDeviceCredentialIntent(title, reason);
  activity.startActivityForResult(authIntent, LOCK_REQUEST_CODE);
  return;
}``

This block can be avoided Androidx is already handling everything from Android 6 to the latest version

[kennethj]

@Pey-crypto @aghanti7 Is this on physical phones or on emulators? What phones/emulators are you using?

[Pey-crypto]

Physical Phones such as alcatel 1x or Nokia 1...These devices run android 8 or higher but do not have a fingerprint scanner https://www.gsmarena.com/alcatel_1x-9086.php

[kennethj]

This is difficult to reproduce. I only have Pixel 1-3 phones for testing and Android 8 emulators appear to always show fingerprint as available hardware – even when emulating a phone that does not have that hardware.

I added some additional hardware and enrollment checks in #3, but I am not sure that addresses the issue reported.

[Pey-crypto]

The issue still exists. Kinda frustrating is it possible to add an Fingerprint Check at Fingerprint Manager https://developer.android.com/reference/android/hardware/fingerprint/FingerprintManager#FINGERPRINT_ERROR_HW_NOT_PRESENT

[Renatinaveen]

In Iphone if faceid is enabled it shows enter passcode or password to proceed instead of asking for faceid.