I am trying to implement FingerPrint Scanner in my app.
I followed below tutorial: http://www.techotopia.com/index.php/An_Android_Fingerprint_Authentication_Tutoria
The issue is with the implementation of the Fingerprint scanner in some old Samsung phones such as the S5 and the Note 4.
Check this link Android M FingerprintManager.isHardwareDetected() returns false on a Samsung Galaxy S5 to see an example of how you can achieve this using the Samsung pass sdk.
You can also refer to http://img-developer.samsung.com/onlinedocs/sms/pass/index.html for the documentation of the pass sdk.