title: android: How to use asyncTask in Rest Web service?
body: <p>I am creating apps in android in that I have login logout activity, Multilistview activity which data coming from rest web service. here problem is that when calling webservice from login activity I get error the networkonmainthreadexception then i searched on goggle about that exception, somebody said on stack overflow use AsyncTask in your code for seperation thread and I implemented asynctask in my code but not working. i am totally confusing how to use asynctask and I want to add asynctask in following code. I provide code without asynctask which i did. can anybody to help me how to exactly use asynctask when calling webservice. </p>
  
  <p>following is the get data from edit text call function</p>
  
  <pre><code>UserFunctions userFun = new UserFunctions();
  
          if ((username.trim().length() &gt; 0)&amp;&amp;(userpsw.trim().length() &gt; 0)) {
  
              JSONObject json = userFun.loginUser(username, userpsw);
              .
                          .
                          .
  </code></pre>
  
  <p>following is the function class  </p>
  
  <pre><code>public JSONObject loginUser(String userEmail, String userPsw) {
  
          List&lt;NameValuePair&gt; params = new ArrayList&lt;NameValuePair&gt;();
          params.add(new BasicNameValuePair("tag", login_tag));
          params.add(new BasicNameValuePair("email", userEmail));
          params.add(new BasicNameValuePair("password", userPsw));
          JSONObject json = jsonParser.getJsondataFromUrl(params);
         //Log.d("tag", json.toString());
          return json;
      }
  </code></pre>
  
  <p>following is the actual webservice class</p>
  
  <pre><code>public void getJsondataFromUrl(List&lt;NameValuePair&gt; params) {
  
       {
          DefaultHttpClient httpClient = new DefaultHttpClient();
          HttpPost httpPost = new HttpPost(url);
          httpPost.setEntity(new UrlEncodedFormEntity(params));
  
          HttpResponse httpResp = httpClient.execute(httpPost);
          HttpEntity httpEntity = httpResp.getEntity();
          inStream = httpEntity.getContent();
          //Log.d(tag, inStream.toString());
      } catch (UnsupportedEncodingException e) {
          e.printStackTrace();
      } catch (ClientProtocolException e) {
          e.printStackTrace();
      } catch (IOException e) {
          e.printStackTrace();
      }
  
      try {
          BufferedReader bufferReader = new BufferedReader(new InputStreamReader
                  (inStream, "iso-8859-1"), 8);
          StringBuilder  strBuilder = new StringBuilder();
          String line = null;
          while ((line = bufferReader.readLine()) != null) {
              strBuilder.append(line + "n");
          }
          inStream.close();
          json = strBuilder.toString();
          //Log.d("JSON", json);
      } catch (Exception e) {
          e.printStackTrace();
      } 
      // try parse the string to a JSON object
      try {
          jsonObj = new JSONObject(json);
      } catch (JSONException e) {
          e.printStackTrace();
      }
  
      return jsonObj;*/
  }
  </code></pre>
  
  <p>Thanks in advance</p>