Is your feature request related to a problem? Please describe.
I have Android 9 and see autofill prompt every time I enter PIN to unlock the app:

After unlock is done I see save password prompt:

Describe the solution you'd like
Simillar to New feature: "Block accessibility services from seeing sensitive input fields via a new settings item" from version 0.7.0 it would be great to see "Disable autofill" checkbox in app settings.

To disable autofill next code could be used:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    passwordInput.setImportantForAutofill(View.IMPORTANT_FOR_AUTOFILL_NO);
}

Describe alternatives you've considered
It's possible to disable Android Oreo autifll system wide. But It's useful feature in other apps.

Additional context
View.setImportantForAutofill was added in API 26.