fingerprintManagerCompat.isHardwareDetected(); return false API22 Android(5.1) OPPO F1s

Hello everyone,
Please I need your help as soon as possible.
I am currently developing an application that uses the fingerprint reader.
I use this predefined method fingerprintManagerCompat.isHardwareDetected (); that lets me know whether the smartphone has a fingerprint sensor or not. The problem is that this method returns FALSE while my OPPO F1s under android 5.1 API22 and has a fingerprint reader.
What should I do?
Thank you.

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