Question

I have a custom dialog and it’s being created by the code below:

public DialogFragment CreateNewPostedMessageDialog(CardSwipeData data, 
    List<MessagesMap> messagesMap, 
    string fbProfileimageAsByteString, 
    Context context) {
            DialogFragment newFragment = 
                new NewPostedMessageDialogFragment(data, messagesMap,
                                                   fbProfileimageAsByteString, 
                                                   context);
            return newFragment;
        }

It’s called from my Activity’s OnResume RunOnUiThread:

ThreadPool.QueueUserWorkItem(state => {
    // Processing stuff here               

    RunOnUiThread(() => {
        DialogFragment dialog = CreateNewPostedMessageDialog(cardSwipeData,
           messagesMap, bitmapByteString, this);

        dialog.Show(FragmentManager, "PostedMessage");

        // ListAdapter gets updated here

        Thread.Sleep(3000);

        dialog.Dismiss();
    });
});

I want to dismiss my dialog after 3 seconds, but what’s happening is my dialog never shows up but my list still gets updated after 3 seconds. Anything I’m doing wrong with the sleep?

Answer 1

What you are doing wrong there is that you are sleeping the UI thread and not the background thread you have spawned in the TreadPool. Try with this instead:

ThreadPool.QueueUserWorkItem(state => {
    // Processing stuff here               

    DialogFragment dialog;

    RunOnUiThread(() => {
        dialog = CreateNewPostedMessageDialog(cardSwipeData,
           messagesMap, bitmapByteString, this);

        dialog.Show(FragmentManager, "PostedMessage");
    });

    // ListAdapter gets updated here
    Thread.Sleep(3000);

    RunOnUiThread(() => dialog.Dismiss()); 
});