Biometric lock for devices without/with broken fingerprint

[PhilKes]

Check if biometric lock works as intended if the device only offers PIN/Pattern device lock

[andiandi13]

I was curious about that, so I installed LDPlayer, which has an Android 9 without biometric option, and when I try to enable biometric app lock, I get the message "No biometric features avalaible on that device" even though I have a PIN code set on this virtual device.

In short, it seems like we can't secure the app with PIN/Pattern.

That being said, I was thinking about adding an internal PIN lock to secure the app, independent on what the device have. We could have two options :

• System biometrics lock (uses fingerprint - and PIN/Pattern if you can fix that)
• App PIN code

[PhilKes]

I think android distincts between biometrics and PIN/Pattern, but both can be used for the BiometricPrompt, I think the checks I implemented in the app just check for Biometrics, and on lower Android Versions I think that returns that the device doesnt have any biometric features

I dont want to introduce a self-implemented PIN, its just too much hassle for something android already provides.

[andiandi13]

Ok I understand. As long as PIN code only can be used from Android 5 (Pie), this is fine.