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POPassing arguments to AsyncTask, and returning results
 

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  1. POPassing arguments to AsyncTask, and returning results
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    <p>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 <code>AsyncTask</code>. </p> <p>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 <code>AsyncTask</code> if Yes is clicked. My question is how to pass an <code>ArrayList&lt;String&gt;</code> to the <code>AsyncTask</code> (and work with it there), and how to get back a new <code>ArrayList&lt;String&gt;</code> like a result from the <code>AsyncTask</code>?</p> <p>The code of the method looks like this:</p> <pre><code>String curloc = current.toString(); String itemdesc = item.mDescription; ArrayList&lt;String&gt; passing = new ArrayList&lt;String&gt;(); passing.add(itemdesc); passing.add(curloc); ArrayList&lt;String&gt; result = new ArrayList&lt;String&gt;(); 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); </code></pre> <p>So, as you see, I would like to send the string array list "passing" to the <code>AsyncTask</code>, and to get the "result" string array list back from it. And the calc_stanica <code>AssycTask</code> class looks like this:</p> <pre><code>public class calc_stanica extends AsyncTask&lt;ArrayList&lt;String&gt;, Void, ArrayList&lt;String&gt;&gt; { ProgressDialog dialog; @Override protected void onPreExecute() { dialog = new ProgressDialog(baraj_mapa.this); dialog.setTitle("Calculating..."); dialog.setMessage("Please wait..."); dialog.setIndeterminate(true); dialog.show(); } protected ArrayList&lt;String&gt; doInBackground(ArrayList&lt;String&gt;... passing) { //Some calculations... return something; //??? } protected void onPostExecute(Void unused) { dialog.dismiss(); } </code></pre> <p>So my question is how to get the elements of the "passing" array list in the <code>AsyncTask doInBackground</code> method (and use them there), and how to return an array list to use in the main method (the "result" array list)?</p>
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