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POHow and where to call my Task when extending AsyncTask
 

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    <p>I am having difficulties understanding AsyncTask, even after reading everything about it on Developer.Android. I am looking for some insight in how I should proceed. This is the situation :</p> <p>I have an Activity which, on an onClick event calls the LoginCheck() method of an underlying LoginController class. The LoginController class then proceeds to fetch whatever information is nescesarry from a UserInfo class or from the Activity(User and Password) and creates an instance of a RestClient which then makes the call to the web service and attempts to log in. RestClient has a private class CallServiceTask that extends AsyncTask. </p> <p>I have a few design problems here that I hope you can be of assistance with. </p> <ul> <li>Am I doing it right? Is this a proper way to make sure that any calls to the web service are being done asynchronously? </li> <li>How do use onProgressUpdate or whatever to notify the user that the application is in the process of logging in?</li> <li>How would I go about getting the data that is saved in DoinBackground() ?</li> </ul> <p>Below you'll find snippets of the project in question :</p> <p><em>RestClient</em></p> <pre><code>// From the constructor... rtnData = new Object[]{ new JSONObject() , Boolean.TRUE }; public void ExecuteCall(RequestMethod method) throws Exception { Object[] parameters = new Object[]{ new HttpGet() , new String("") }; switch(method) { case GET: { //add parameters String combinedParams = ""; if(!params.isEmpty()){ combinedParams += "?"; for(NameValuePair p : params) { String paramString = p.getName() + "=" + URLEncoder.encode(p.getValue()); if(combinedParams.length() &gt; 1) { combinedParams += "&amp;" + paramString; } else { combinedParams += paramString; } } } HttpGet request = new HttpGet(url + combinedParams); //add headers for(NameValuePair h : headers) { request.addHeader(h.getName(), h.getValue()); } parameters[0] = request; parameters[1] = url; new CallServiceTask().execute(request, url); jsonData = ((JSONObject) rtnData[0]).optJSONObject("data"); connError = (Boolean) rtnData[1]; break; } case POST: .... } } private Object[] executeRequest(HttpUriRequest request, String url) { HttpClient client = new DefaultHttpClient(); client = getNewHttpClient(); HttpResponse httpResponse; try { httpResponse = client.execute(request); HttpEntity entity = httpResponse.getEntity(); if (entity != null) { InputStream instream = entity.getContent(); String response = convertStreamToString(instream); try { rtnData[0] = new JSONObject(response); rtnData[1] = false; } catch (JSONException e1) { rtnData[1] = true; e1.printStackTrace(); } // Closing the input stream will trigger connection release instream.close(); } } catch (ClientProtocolException e) { client.getConnectionManager().shutdown(); e.printStackTrace(); } catch (IOException e) { client.getConnectionManager().shutdown(); e.printStackTrace(); } return rtnData; } </code></pre> <p><em>CallServiceTask</em></p> <pre><code> private class CallServiceTask extends AsyncTask&lt;Object, Void, Object[]&gt; { protected Object[] doInBackground(Object... params) { HttpUriRequest req = (HttpUriRequest) params[0]; String url = (String) params[1]; return executeRequest(req, url); } @Override protected void onPostExecute(Object[] result) { rtnData = result; } } </code></pre>
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