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 locked
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?
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.