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I have a DialogFragment that handles login and fingerprint authentication for my application. This fragment uses two classes that are exclusive to API 23, KeyGenParameterSpec and KeyPermanentlyInvalidatedException. I had been under the impression that I could use these classes, as long as I check the build version before I try to initialize the classes (outlined here):

if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    ...
} else {
    ...
}

But it appears that this is not the case. If I try …