Handle remote exception in Asynctask

Here's the Asynctask method:

public class Read extends AsyncTask<String, Integer, String> {
    ProgressDialog dialog;

    @Override
    protected void onPreExecute() {
        // TODO Auto-generated method stub
    }

    @Override
    protected String doInBackground(String... params) {
        // TODO Auto-generated method stub
        try {
            sUrl = sUrl.trim();
            json = lastTweet(sUrl);
            return json.getString(params[0]);
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(String result) {
        // TODO Auto-generated method stub 
    }

}

And related lastTweet method:

public JSONObject lastTweet(String username)
        throws ClientProtocolException, IOException, JSONException {
    HttpGet get = new HttpGet(url.toString());
    HttpResponse r = client.execute(get);
    int status = r.getStatusLine().getStatusCode();
    if (status == 200) {
        HttpEntity e = r.getEntity();
        String data = EntityUtils.toString(e);
        JSONArray timeline = new JSONArray(data);
        JSONObject last = timeline.getJSONObject(0);
        return last;
    }
}

All of this code is working fine. No issues as of now. However, there's minor tinkering I want to do. As and when the connectivity is lost during HTTP transmission, a RemoteException is thrown and app crashes.

I tried to handle exception within Async method but not able to do so.

Any way to handle such an exception?

you can check network connectivity before executing your Read AsyncTask

1. check Connection

if(ifConnectionIsAvailable)
    new Read().execute();

2. set Connection Time Out

HttpGet get = new HttpGet(url.toString());
HttpParams httpParameters = new BasicHttpParams();
int timeoutConnection = 3000;// in milliseconds 
HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
int timeoutSocket = 5000;
HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
DefaultHttpClient httpClient = new DefaultHttpClient(httpParameters);
HttpResponse r = httpClient.execute(get);