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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?
724
Most phones give you a maximum of five fingerprints for security reasons.
The fingerprint sensor may not work if your hand is wet, moist, oily, or dirty. So, if your finger has any of these, you might not be able to unlock your phone using the fingerprint. The way out is to wash your hands, clean them, and wait for them to dry out. Now try to unlock your phone with your fingerprint.
You can add up to 5 fingerprints.
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.
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