Biometry is awesome and if your users need to login to use your app to it’s fullest, you should consider implementing biometry. Now it is quite easy with androidx.biometric library.
Below you can find few really useful articles helpful in implementing Biometry in your app.
Migrating to biometry: https://medium.com/androiddevelopers/migrating-from-fingerprintmanager-to-biometricprompt-4bc5f570dccd
Android Biometry API first steps:
https://www.raywenderlich.com/18782293-android-biometric-api-getting-started
Biometric constants class:
https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/hardware/biometrics/BiometricConstants.java
5 steps to implement biometry:
https://proandroiddev.com/5-steps-to-implement-biometric-authentication-in-android-dbeb825aeee8
What is new in Android P — BiometricPrompt:
https://medium.com/appnroll-publication/what-is-new-in-android-p-biometricprompt-d4fc85e55608