How to process HttpResponse in AsyncTask android

Question

My activity executes http request using AsynTask. How to process HttpResponse in case if web-server does not answer? Currently when my web-server is down, AsynTask just stopped at "HttpResponse response = client.execute(httppost);" and then do nothing. I need to process this response and do something, but code belowe "execute" is not executed.

Here is ny background task:

 protected String doInBackground(String... params) { HttpClient client = new DefaultHttpClient(); String result = null; try { // Add your data List<NameValuePair> postData = new ArrayList<NameValuePair>(2); postData.add(new BasicNameValuePair("session_id", session_id)); postData.add(new BasicNameValuePair("i_key", params[0])); HttpPost httppost = new HttpPost( "http://my.webserver.com/getInfo.php"); httppost.setEntity(new UrlEncodedFormEntity(postData)); HttpResponse response = client.execute(httppost); HttpEntity responseEntity = response.getEntity(); if (responseEntity != null) { BufferedReader reader = new BufferedReader( new InputStreamReader(responseEntity.getContent(), "UTF-8")); result = reader.readLine().toString(); } else { Toast.makeText(this, "DDDDDDD",Toast.LENGTH_LONG).show(); } } catch (IllegalArgumentException e1) { e1.printStackTrace(); } catch (IOException e2) { e2.printStackTrace(); } return result; }

How I can handle response if web-server is down and not reply ?

Put a timeout, after that you will get a timeout exception, if you web-server is not down/don't reply. Give it a try, stackoverflow.com/questions/16098810/… — surender8388
– surender8388, Commented Apr 21, 2013 at 17:10
You should'nt use AsyncTask to perform network request since when the orientation of your device changes the activity is destroyed but also the AsyncTask which is tied to the lifecycle of this activity. To avoid that you should use Service pattern instead. — Pierre Criulanscy
– Pierre Criulanscy, Commented Apr 24, 2013 at 19:43

Ted Hopp · Accepted Answer · 2013-04-21 17:05:15Z

You need to set a timeout for your client's connection. For instance:

protected String doInBackground(String... params) { HttpParams httpParameters = new BasicHttpParams(); // set the connection timeout and socket timeout parameters (milliseconds) HttpConnectionParams.setConnectionTimeout(httpParameters, 5000); HttpConnectionParams.setSoTimeout(httpParameters, 5000); HttpClient client = new DefaultHttpClient(httpParameters); . . . // the rest of your code }

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