title: flutter android fingerprint integration
body: <p>I am looking for some guidance when using flutter over a platform channel to integrate with android fingerprint authentication.  I have the android part working and the flutter app with call the method, but I can not seem to get just a pop-up of fingerprint authentication like I do in swift, which works fine in the same flutter app, in order for it to pass results to the flutter app and let the flutter app continue on. If anyone has any examples or some guidance it would be greatly appreciated.</p>