Megy a program letöltése is...

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

@@ -24,7 +24,7 @@
                     Text="Mégse"
                     FontSize="18"
                     TextColor="White"
-                    HorizontalOptions="Center"
+                    HorizontalOptions="Fill"
                     Clicked="OnCancelButtonClicked" />
         </VerticalStackLayout>
     </Frame>

src/WorkFlowCheck.MAUI/Pages/System/DownloadAPKPage.xaml

@@ -0,0 +1,37 @@
+<?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.System.DownloadAPKPage"
+             Title="Program letöltés">
+    <ScrollView>
+        <Grid>
+            <Grid.RowDefinitions>
+                <RowDefinition Height="*" />
+                <RowDefinition Height="Auto" />
+                <RowDefinition Height="*" />
+            </Grid.RowDefinitions>
+            <Frame 
+                Grid.Row="1"    
+                BorderColor="Gray" 
+                CornerRadius="20"
+                Padding="30" 
+                Margin="1" 
+                HasShadow="True"
+                HorizontalOptions="Center"
+                VerticalOptions="Center"
+                WidthRequest="{OnPlatform Android=350, iOS=350, WinUI=400, MacCatalyst=400}"
+                MaximumWidthRequest="500">
+                <VerticalStackLayout Margin="10,10,10,0">
+                    <Label x:Name="progressLabel" Text="Folyamatjelző" FontSize="Medium" HorizontalOptions="Center" />
+                    <ProgressBar x:Name="progressBar" WidthRequest="300" HeightRequest="40" />
+                    <Button x:Name="SyncBtn" Text="Program letöltés" Clicked="OnSyncClicked" Margin="10,10,10,10" />
+                    <ActivityIndicator x:Name="LoadingIndicator" 
+               IsRunning="False" 
+               IsVisible="False"
+               VerticalOptions="Center" 
+               HorizontalOptions="Center" />
+                </VerticalStackLayout>
+            </Frame>
+        </Grid>
+    </ScrollView>
+</ContentPage>

src/WorkFlowCheck.MAUI/Pages/System/DownloadAPKPage.xaml.cs

@@ -0,0 +1,54 @@
+using WorkFlowCheck.MAUI.Services.Interfaces;
+
+namespace WorkFlowCheck.MAUI.Pages.System;
+
+public partial class DownloadAPKPage : ContentPage
+{
+    private ISyncService _syncService;
+    public DownloadAPKPage()
+	{
+		InitializeComponent();
+        _syncService = MauiProgram.ServiceProvider.GetRequiredService<ISyncService>();
+    }
+    private async void OnSyncClicked(object sender, EventArgs e)
+    {
+        SyncBtn.IsEnabled = false;
+        LoadingIndicator.IsRunning = true;
+        LoadingIndicator.IsVisible = true;
+        progressLabel.Text = "Letöltés indítása...";
+        progressBar.Progress = 0;
+
+        try
+        {
+            await Task.Run(async () =>
+            {
+                await _syncService.DownloadAPK((percentage, infostring) =>
+                {
+                    MainThread.BeginInvokeOnMainThread(() =>
+                    {
+                        progressBar.Progress = percentage / 100;
+                        progressLabel.Text = $"{infostring}: {percentage:0.00}%";
+                    });
+                });
+            });
+
+            progressLabel.Text = "Letöltés kész!";
+            await Shell.Current.GoToAsync("//MainPage");
+        }
+        catch (Exception ex)
+        {
+            progressLabel.Text = $"Hiba történt: {ex.Message}";
+        }
+        finally
+        {
+            SyncBtn.IsEnabled = true;
+            LoadingIndicator.IsVisible = false;
+            LoadingIndicator.IsRunning = false;
+        }
+    }
+    protected override bool OnBackButtonPressed()
+    {
+        Shell.Current.GoToAsync("//MainPage");
+        return true;
+    }
+}