NFC Test vol 1.

src/WorkFlowCheck.MAUI/Pages/NFC/NFCTestPage.xaml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="WorkFlowCheck.MAUI.Pages.NFC.NFCTestPage"
+             Title="NFCTestPage">
+    <VerticalStackLayout>
+        <Label 
+            Text="Welcome to .NET MAUI!"
+            VerticalOptions="Center" 
+            HorizontalOptions="Center" />
+    </VerticalStackLayout>
+</ContentPage>

src/WorkFlowCheck.MAUI/Pages/NFC/NFCTestPage.xaml.cs

@@ -0,0 +1,130 @@
+using Plugin.NFC;
+using System.Text;
+
+namespace WorkFlowCheck.MAUI.Pages.NFC;
+
+public partial class NFCTestPage : ContentPage
+{
+	public NFCTestPage()
+	{
+		InitializeComponent();
+	}
+    public const string ALERT_TITLE = "NFC";
+    bool _eventsAlreadySubscribed = false;
+    protected override async void OnAppearing()
+    {
+        base.OnAppearing();
+        CrossNFC.Legacy = false;
+        if (CrossNFC.IsSupported)
+        {
+            if (!CrossNFC.Current.IsAvailable)
+                await ShowAlert("NFC is not available");
+             
+            if (!CrossNFC.Current.IsEnabled)
+                await ShowAlert("NFC is disabled");
+
+            await AutoStartAsync().ConfigureAwait(false);
+        }
+        else
+        {
+            await ShowAlert("NFC is not available");
+        }
+    }
+    Task ShowAlert(string message, string title = null) => DisplayAlert(string.IsNullOrWhiteSpace(title) ? ALERT_TITLE : title, message, "OK");
+    async Task AutoStartAsync()
+    {
+        // Some delay to prevent Java.Lang.IllegalStateException "Foreground dispatch can only be enabled when your activity is resumed" on Android
+        await Task.Delay(500);
+        await StartListeningIfNotiOS();
+    }
+    async Task StartListeningIfNotiOS()
+    {
+        
+        await BeginListening();
+    }
+    async Task BeginListening()
+    {
+        try
+        {
+            MainThread.BeginInvokeOnMainThread(() =>
+            {
+                SubscribeEvents();
+                CrossNFC.Current.StartListening();
+            });
+        }
+        catch (Exception ex)
+        {
+            await ShowAlert(ex.Message);
+        }
+    }
+    void SubscribeEvents()
+    {
+        if (_eventsAlreadySubscribed)
+            UnsubscribeEvents();
+
+        _eventsAlreadySubscribed = true;
+
+        CrossNFC.Current.OnMessageReceived += Current_OnMessageReceived;
+        //CrossNFC.Current.OnMessagePublished += Current_OnMessagePublished;
+        //CrossNFC.Current.OnTagDiscovered += Current_OnTagDiscovered;
+        //CrossNFC.Current.OnNfcStatusChanged += Current_OnNfcStatusChanged;
+        //CrossNFC.Current.OnTagListeningStatusChanged += Current_OnTagListeningStatusChanged;
+
+        
+    }
+    void UnsubscribeEvents()
+    {
+        CrossNFC.Current.OnMessageReceived -= Current_OnMessageReceived;
+        //CrossNFC.Current.OnMessagePublished -= Current_OnMessagePublished;
+        //CrossNFC.Current.OnTagDiscovered -= Current_OnTagDiscovered;
+        //CrossNFC.Current.OnNfcStatusChanged -= Current_OnNfcStatusChanged;
+        //CrossNFC.Current.OnTagListeningStatusChanged -= Current_OnTagListeningStatusChanged;
+
+        
+
+        _eventsAlreadySubscribed = false;
+    }
+    async void Current_OnMessageReceived(ITagInfo tagInfo)
+    {
+        if (tagInfo == null)
+        {
+            await ShowAlert("No tag found");
+            return;
+        }
+
+        // Customized serial number
+        var identifier = tagInfo.Identifier;
+        var serialNumber = NFCUtils.ByteArrayToHexString(identifier, ":");
+        var title = !string.IsNullOrWhiteSpace(serialNumber) ? $"Tag [{serialNumber}]" : "Tag Info";
+
+        if (!tagInfo.IsSupported)
+        {
+            await ShowAlert("Unsupported tag (app)", title);
+        }
+        else if (tagInfo.IsEmpty)
+        {
+            await ShowAlert("Empty tag", title);
+        }
+        else
+        {
+            var first = tagInfo.Records[0];
+            await ShowAlert(GetMessage(first), title);
+        }
+    }
+    string GetMessage(NFCNdefRecord record)
+    {
+        var message = $"Message: {record.Message}";
+        message += Environment.NewLine;
+        message += $"RawMessage: {Encoding.UTF8.GetString(record.Payload)}";
+        message += Environment.NewLine;
+        message += $"Type: {record.TypeFormat}";
+
+        if (!string.IsNullOrWhiteSpace(record.MimeType))
+        {
+            message += Environment.NewLine;
+            message += $"MimeType: {record.MimeType}";
+        }
+
+        return message;
+    }
+}

src/WorkFlowCheck.MAUI/Pages/Security/LoginPage.xaml.cs

@@ -21,7 +21,7 @@ public partial class LoginPage : ContentPage
             await DisplayAlert("Success", "You are now logged in.", "OK");
 
             // Visszatérés a MainPage-re
-            await Navigation.PopAsync();
+            await Shell.Current.GoToAsync("//MainPage");
         }
         else
         {