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androidxamarin.formsxamarin.androidfingerprint

How to find if user has enrolled any fingerprints

I need to identify if the user has any fingerprint register on their device. However, I got an error using this line 

  FingerprintManagerCompat  fpm = (FingerprintManagerCompat)CrossCurrentActivity.Current.Activity.GetSystemService(Context.FingerprintService);

``` error `` 

{System.InvalidCastException: Specified cast is not valid.
  at app.Droid.lyA.FingerPrint.HasEnrolledFingerprints () [0x00002] in /../../../appmobile/../Droid/lyA/FingerPrint.cs:19 }

This is what I need to return.

here is the cast

Solution

  • Converting my comment to an answer-

    It seems that there is an error with the casting you did at 

    FingerprintManagerCompat fpm = (FingerprintManagerCompat)CrossCurrentActivity.Current.Activity.GetSystemService(Context.FingerprintService);

    It seems that whatever is being returned here cannot be cast to FingerprintManagerCompat.

    As mentioned in another answer, the correct way to use FingerprintManagerCompat is actually -

    FingerprintManagerCompat fpm= FingerprintManagerCompat.From(this);

    I would suggest changing to this and checking if it solves the issue.