You must disable foreground dispatching while your activity is still resumed

[franckbour]

You must disable foreground dispatching while your activity is still resumed

[franckbour]

You probably need to unsubscribe and stop listening in the main thread like this:

Device.BeginInvokeOnMainThread(() =>
{
    CrossNFC.Current.OnMessageReceived -= Current_OnMessageReceived;
    CrossNFC.Current.StopListening();
});

[kberawala]

You probably need to unsubscribe and stop listening in the main thread like this:

Device.BeginInvokeOnMainThread(() =>
{
    CrossNFC.Current.OnMessageReceived -= Current_OnMessageReceived;
    CrossNFC.Current.StopListening();
});

It worked. Thanks

[nanorie]

instead of stop listening directly in Current_OnMessageReceived, i call it in another task not waited

private async void Current_OnMessageReceived(ITagInfo tagInfo)
{
   // do stuff
   await Task.Run(() => StopListening()).ConfigureAwait(false);
}
private async Task StopListening()
{
   try
   {
      MainThread.BeginInvokeOnMainThread(() =>
      {
         CrossNFC.Current.StopListening();
         CrossNFC.Current.OnMessageReceived -= Current_OnMessageReceived;
      });
   }
   catch (Exception ex)
   {
   }
}

All this code is in a service and works for me on android and Maui (but I don't understand the underlying mechanism that makes it work)
Hope it can help someone

[pvanroos]

I added the above code at the end of the 'Current_OnMessageReceived' event handler and I'm still getting the error: You must disable foreground dispatching while your activity is still resumed

[kberawala]

I added the above code at the end of the 'Current_OnMessageReceived' event handler and I'm still getting the error: You must disable foreground dispatching while your activity is still resumed

check if your page is => var page = new navigationpage(new scanpage());
and not var page = new scanpage(); (this didn't work for me)

[saamerm]

This solution worked for me too. @pvanroos were you able to figure out your issue?

[pvanroos]

Yes, this helped. I make sure that events are subscribed and unsubscribed cleanly when loading a page or exiting a page where scanning is supposed to happen too.

Also, (off topic), I still wish I knew what causes the 'Stack Error' message on iOS. Once in a while, my users will see this message when attempting to scan an NFC tag. I think it's caused when they don't hold the phone still to allow the data transfer to execute cleanly. I wish we could hook an event handler into this error and handle it gracefully.

I added the above code at the end of the 'Current_OnMessageReceived' event handler and I'm still getting the error: You must disable foreground dispatching while your activity is still resumed

check if your page is => var page = new navigationpage(new scanpage()); and not var page = new scanpage(); (this didn't work for me)

scan worked on my homepage but not certain pages, however it worked on a page which used
"await Navigation.PushAsync(new pageName());" but now that i've changed my way to navigate , it works on every pages.

do we know why this way works and not the other?