title: how to use Json parser android?
body: <p>I used the parser given below with an example  Android 2.2. My example is working and i have no problem. when tried to use the some example in a project using Android 4.3. but i have a problem with my parser line </p>
  
  <pre><code>HttpResponse httpResponse = httpClient.execute(httpPost);
  </code></pre>
  
  <p>I checked all the permission in my manifest, all of them are used.</p>
  
  <pre><code>public class JSONParser {
  
      static InputStream is = null;
      static JSONObject jObj = null;
      static String json = "";
  
      // constructor
      public JSONParser() {
  
      }
  
      public JSONObject getJSONFromUrl(String url) {
  
          // Making HTTP request
          try {
              // defaultHttpClient
              Log.d("test url" , "le request est lancé") ;
              DefaultHttpClient httpClient = new DefaultHttpClient();
              HttpPost httpPost = new HttpPost(url);
              HttpResponse httpResponse = httpClient.execute(httpPost);
              Log.d("test url" , "la connection etablie");
              HttpEntity httpEntity = httpResponse.getEntity();
              is = httpEntity.getContent();
  
          } catch (UnsupportedEncodingException e) {
              e.printStackTrace();
          } catch (ClientProtocolException e) {
              e.printStackTrace();
          } catch (IOException e) {
              e.printStackTrace();
          }
  
          try {
              BufferedReader reader = new BufferedReader(new InputStreamReader(
                      is, "iso-8859-1"), 8);
              StringBuilder sb = new StringBuilder();
              String line = null;
              while ((line = reader.readLine()) != null) {
                  sb.append(line + "\n");
              }
              is.close();
              json = sb.toString();
          } catch (Exception e) {
              Log.e("Buffer Error", "Error converting result " + e.toString());
          }
  
          // try parse the string to a JSON object
          try {
              jObj = new JSONObject(json);
          } catch (JSONException e) {
              Log.e("JSON Parser", "Error parsing data " + e.toString());
          }
  
          // return JSON String
          return jObj;
  
      }
  }
  </code></pre>
  
  <p>the log is: </p>
  
  <pre><code>11-14 10:48:38.590: ERROR/AndroidRuntime(3801): FATAL EXCEPTION: main
          java.lang.RuntimeException: Unable to start activity ComponentInfo{fr.web.tab/fr.web.profilconfiguration.AndroidJSONParsingActivity}: android.os.NetworkOnMainThreadException
          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
          at android.app.ActivityThread.access$600(ActivityThread.java:123)
          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
          at android.os.Handler.dispatchMessage(Handler.java:99)
          at android.os.Looper.loop(Looper.java:137)
          at android.app.ActivityThread.main(ActivityThread.java:4424)
          at java.lang.reflect.Method.invokeNative(Native Method)
          at java.lang.reflect.Method.invoke(Method.java:511)
          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
          at dalvik.system.NativeStart.main(Native Method)
          Caused by: android.os.NetworkOnMainThreadException
          at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
          at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
          at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
          at java.net.InetAddress.getAllByName(InetAddress.java:220)
          at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
          at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
          at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
          at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
          at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
          at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
          at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
          at fr.web.profilconfiguration.JSONParser.getJSONFromUrl(JSONParser.java:44)
          at fr.web.profilconfiguration.AndroidJSONParsingActivity.onCreate(AndroidJSONParsingActivity.java:62)
          at android.app.Activity.performCreate(Activity.java:4465)
          at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
  </code></pre>