生物识别技术 - 在Android PIE-9上形成指纹管理器Xamarin

Question

FingerprintManager＃isHardwareDetected（）和FingerprintManager＃hasEnrolledFingerprints（）。这两个都在Android 28中被弃用。我还可以使用什么来查看指纹是否在此版本中注册？我认为这是一个选择。

KeyguardManager keyguardManager =
                    (KeyguardManager) getSystemService(KEYGUARD_SERVICE);

如果该选项没问题，如何将其转换为xamarin表单，例如（）

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

对此：

Answer 1

您可以使用Plugin.Fingerprint在Android 9.0中实现它。 https://www.nuget.org/packages/Plugin.Fingerprint/

有我的演示GIF（如果你第一次运行这个项目，请确保你已经在你的设备中创建了指纹）。

因为表单只有一个活动，如果按下auth页面，我们应该达到ActivityLifecycleCallbacks和FingerprintDialogFragment

这是MainApplication的代码，它需要Plugin.CurrentActivity插件

    [Application]
public class MainApplication : Application, Application.IActivityLifecycleCallbacks
{
    public MainApplication(IntPtr handle, JniHandleOwnership transer)
      : base(handle, transer)
    {
    }

    public override void OnCreate()
    {
        base.OnCreate();
        RegisterActivityLifecycleCallbacks(this);

        CrossFingerprint.SetCurrentActivityResolver(() => CrossCurrentActivity.Current.Activity);

        // uncomment this line to use custom dialog
        //CrossFingerprint.SetDialogFragmentType<MyCustomDialogFragment>();
    }

    public override void OnTerminate()
    {
        base.OnTerminate();
        UnregisterActivityLifecycleCallbacks(this);
    }

    public void OnActivityCreated(Activity activity, Bundle savedInstanceState)
    {
        CrossCurrentActivity.Current.Activity = activity;
    }

    public void OnActivityDestroyed(Activity activity)
    {
    }

    public void OnActivityPaused(Activity activity)
    {
    }

    public void OnActivityResumed(Activity activity)
    {
        CrossCurrentActivity.Current.Activity = activity;
    }

    public void OnActivitySaveInstanceState(Activity activity, Bundle outState)
    {
    }

    public void OnActivityStarted(Activity activity)
    {
        CrossCurrentActivity.Current.Activity = activity;
    }

    public void OnActivityStopped(Activity activity)
    {
    }
}

这是My Custom DialogFragment的代码

   public class MyCustomDialogFragment : FingerprintDialogFragment
{
    public override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);

        // Create your fragment here
    }

    public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        var view = base.OnCreateView(inflater, container, savedInstanceState);
        view.Background = new ColorDrawable(Color.Blue);
        return view;
    }
}

有我的演示代码。

https://github.com/851265601/FrigerPrintDemo