Null Pointer Exception on android.hardware.fingerprint.FingerprintManager.isHardwareDetected()

[abumoallim]

I am getting null pointer exception on Xiomi Mobile particularly.

I am using Lollipin for 6 months.
This has recently occurred in Xiomi phone. Though it works on other phones.

I would like to know if any possible solution for this.

I am posting detail of error and Device details :

Fatal Exception: java.lang.RuntimeException
Unable to resume activity {.CustomPinActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.hardware.fingerprint.FingerprintManager.isHardwareDetected()' on a null object reference

Android : 8.1.0 and Mobile : Xiomi Redmi 6A .

[yar1k0v]

Up, I got the same issue with the library ver. 2.0

[yar1k0v]

The cause of this exception is that on many devices the FingerprintManager is not accessible (the reference is null) and to access it you need a vendors SDK installed with its own libraries set.
The quick solution here is to add a null check inside FingerprintUiHelper.isFingerprintAuthAvailable() (line number 222) method on the FingerprintManager class right before calling any method on it.