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I have an application that does some long calculations, and I would like to show a progress dialog while this is done. So far I have found that I could do this with threads/handlers, but didn't work, and then I found out about the AsyncTask . In my application I use maps with markers on it, and I have implemented the onTap function to call a method that I have defined. The method creates a dialog with Yes/No buttons, and I would like to call an AsyncTask if Yes is clicked. My question is how to pass an ArrayList<String> to the AsyncTask (and work with it there), and how to get back a new ArrayList<String> like a result from the AsyncTask ? The code of the method looks like this: String curloc = current.toString(); String itemdesc = item.mDescription; ArrayList<String> passing = new ArrayList<String>(); passing.add(itemdesc); passing.add(curloc); ArrayList<String> result = new ArrayList<String>(); new calc_stanica().execute(passing,result); String minim = result.get(0); int min = Integer.parseInt(minim); String glons = result.get(1); String glats = result.get(2); double glon = Double.parseDouble(glons); double glat = Double.parseDouble(glats); GeoPoint g = new GeoPoint(glon, glat); String korisni_linii = result.get(3); So, as you see, I would like to send the string array list "passing" to the AsyncTask , and to get the "result" string array list back from it. And the calc_stanica AssycTask class looks like this: public class calc_stanica extends AsyncTask<ArrayList<String>, Void, ArrayList<String>> { ProgressDialog dialog; @Override protected void onPreExecute() { dialog = new ProgressDialog(baraj_mapa.this); dialog.setTitle("Calculating..."); dialog.setMessage("Please wait..."); dialog.setInde

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