Android Fingerprint only allows 5 attempts at a period of time

Question

I am developing an Android App that requires fingerprint to open an Activity. I just noticed when I unlock my phone using my fingerprint, the number of attempts to scan a fingerprint in my app only becomes 4.

For example:

• Phone is unlocked

• Unlock phone using fingerprint

• Open my fingerprint app

• Cannot attempt to scan a fingerprint more than 4 times

Another scenario:

• Fingerprint app is open

• Only 5 attempts will be accepted, app will no longer attempt to scan a fingerprint

• Wait for a period of time, again, only 5 attempts within a duration will be accepted

Is there a workaround for this?

Answer 1

I did some research and found the Android 6.0 Compatibility Definition Document.

This was stated under the Fingerprint Sensor section:

Device implementations with a secure lock screen SHOULD include a fingerprint sensor. If a device implementation includes a fingerprint sensor and has a corresponding API for third-party developers, it:

MUST rate limit attempts for at least 30 seconds after 5 false trials for fingerprint verification.

So.. I guess there's no workaround for this at the moment.