如何查找用户是否注册了任何指纹 [英] How to find if user has enrolled any fingerprints

问题描述

我需要确定用户的设备上是否有任何指纹寄存器.但是，使用此行时出现错误

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);

```错误''

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

这就是我需要返回的.

推荐答案

使用FingerprintManagerCompat的正确方法实际上是这样的:

The correct way of using FingerprintManagerCompat is actually something like this:

FingerprintManagerCompat fpm= FingerprintManagerCompat.From(CrossCurrentActivity.Current.Activity);

祝你好运！

在查询的情况下还原.

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