detect fingerprint Android/iOS

XDemo.Android/MainActivity.cs

@@ -5,6 +5,7 @@
 using FFImageLoading.Forms.Platform;
 using Android.Views;
 using Xamarin.Forms;
+using Plugin.CurrentActivity;
 
 namespace XDemo.Droid
 {
@@ -34,6 +35,8 @@ protected override void OnCreate(Bundle savedInstanceState)
              * ================================================================================================*/
             CachedImageRenderer.Init(true);
 
+            CrossCurrentActivity.Current.Init(this, savedInstanceState);
+
             /* ==================================================================================================
              * set the app info secure in app switcher
              * ================================================================================================*/

XDemo.Android/Services/Implementations/Fingerprints/FingerprintHandler.cs

@@ -0,0 +1,59 @@
+using System;
+using Android;
+using Android.Content;
+using Android.Hardware.Fingerprints;
+using Android.OS;
+using Android.Runtime;
+using Java.Lang;
+using Plugin.CurrentActivity;
+using XDemo.Core.BusinessServices.Interfaces.Hardwares.LocalAuthentications;
+
+namespace XDemo.Droid.Services.Implementations.Fingerprints
+{
+    public interface IFingerprint
+    {
+        void AuthenticationResult(FingerprintResult result);
+    }
+
+
+    public class FingerprintHandler : FingerprintManager.AuthenticationCallback
+    {
+        private IFingerprint fingerprint;
+
+        public FingerprintHandler(IFingerprint fingerprint)
+        {
+            this.fingerprint = fingerprint;
+        }
+
+        public CancellationSignal Start(FingerprintManager manager, FingerprintManager.CryptoObject cryptoObject)
+        {
+            CancellationSignal cancellationSignal = new CancellationSignal();
+            if(CrossCurrentActivity.Current.Activity.CheckSelfPermission(Manifest.Permission.UseFingerprint) != Android.Content.PM.Permission.Granted)
+            {
+                return cancellationSignal;
+            }
+            manager.Authenticate(cryptoObject, cancellationSignal, 0, this, null);
+            return cancellationSignal;
+        }
+
+        public override void OnAuthenticationError([GeneratedEnum] FingerprintState errorCode, ICharSequence errString)
+        {
+            fingerprint?.AuthenticationResult(FingerprintResult.Error);
+        }
+
+        public override void OnAuthenticationFailed()
+        {
+            fingerprint?.AuthenticationResult(FingerprintResult.Failed);
+        }
+
+        public override void OnAuthenticationHelp([GeneratedEnum] FingerprintState helpCode, ICharSequence helpString)
+        {
+            fingerprint?.AuthenticationResult(FingerprintResult.Help);
+        }
+
+        public override void OnAuthenticationSucceeded(FingerprintManager.AuthenticationResult result)
+        {
+            fingerprint?.AuthenticationResult(FingerprintResult.Succeed);
+        }
+    }
+}