Register user biometrinc finger print in flutter

Question

Can we register a biometric fingerprint on the phone in flutter. I search about that on google and found loca_auth flutter plugin but it can only get the list of biometric fingerprints and authenticate fingerprint but what I need is to register biometric fingerprints in the device.

Answer 1

Third party apps do not have the capacity to register/add biometric materials to devices, no matter what platform you are using -- flutter, etc. Here is how the flow works in general.

1. User gets a new phone (purchased, gifted, found, etc.), a phone that supports biometric authentication.
2. User goes to Settings and enrolls a biometric template (e.g. enrolls their fingerprint as a way of unlocking the device). In general, this is the only way to register/enroll a fingerprint/face/iris/etc.
3. Your app wants users to authenticate using biometrics and so implements something similar to what's described here or here.

Now inside your app, when the user clicks to authenticate(), your app never actually sees any biometric materials. Biometric materials are kept in a secure location so that third party apps cannot access them. What your app gets is acknowledgement from the Framework that the fingerprint/face/iris trying to authenticate into your app is indeed enrolled on the device. Checkout the blog posts I mentioned for more details.

Answer 2

You can do this. Just take a look at this: Fingerprint Authentication in Flutter

Accordingly you also need to set permissions in android manifest file too.