Fingerprint BiometricPrompt on android P from a View

Question

I am using FingerprintManager to authenticate my app with fingerprint. I have and android View with the fingerprint ui and when the FingerprintManager.authenticate callbacks are called I handle the callbacks in the view, e.g change fingerprint icon, error text etc.

Now in Android P, I have to use BiometricPrompt, which is easy enough to use, but forces me to have an Activity in order to work properly

Is there a way to make BiometricPrompt work in a plain android view?

this is my working code to launch the prompt in an activity

    Signature signature = createSignature();
    biometricPrompt = new BiometricPrompt.Builder(context)
            .setDescription("Description")
            .setTitle("Title")
            .setSubtitle("Subtitle")
            .setNegativeButton("Cancel", context.getMainExecutor(), new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    Log.i(TAG, "Cancel button clicked");
                }
            })
            .build();

        biometricPrompt.authenticate(new BiometricPrompt.CryptoObject(signature), cancellationSignal, context.getMainExecutor() , new BiometricPrompt.AuthenticationCallback() {...}

where context is an activity that without it it can not work

Answer 1

After going over the comments I have received in the question thread, I saw that the problem was in cancellationSignal, FingerprintManager does work in Android P as well as BiometricPrompt in views,

The actual problem was on Samsung devices (Note9 , S10) running android P, when using FingerprintManager a transparent screen will appear and cover the view I had cancelationSignal.cancel in onDetach that would break the entire auth flow. On other devices it makes sense, since the user can close the fingerprint screen on demand