Question

I have this code which returns Json object from url.
It works fine in froyo but the same code is not working in Jelly Beans.

Is something wrong with my code ?

Please help me, here is my code

    public static JSONObject getJSONfromURL(String url) {

    // initialize
    InputStream is = null;
    String result = "";
    JSONObject jArray = null;

    // http post
    try {
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(url);
        HttpResponse response = httpclient.execute(httppost);
        HttpEntity entity = response.getEntity();
        is = entity.getContent();

    } catch (Exception e) {
        Log.e("log_tag", "Error in http connection " + e.toString());
    }

    // convert response to string
    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();
        result = sb.toString();
    } catch (Exception e) {
        Log.e("log_tag", "Error converting result " + e.toString());
    }

    // try parse the string to a JSON object
    try {
        jArray = new JSONObject(result);
    } catch (JSONException e) {
        Log.e("log_tag", "Error parsing data " + e.toString());
    }

    return jArray;
}

Here is my log error

11-01 11:01:48.437: E/log_tag(1044): Error in http connection android.os.NetworkOnMainThreadException
11-01 11:01:48.437: E/log_tag(1044): Error converting result java.lang.NullPointerException
11-01 11:01:48.437: E/log_tag(1044): Error parsing data org.json.JSONException: End of input at character 0 of

Answer 1

From Android API v15, it requires no heavy process working on main thread. So you should move your logic to another thread like bellow source code:

new Thread(new Runnable() {
   public void run() {
        // your logic
   }                        
}).start();

More information please refer
http://developer.android.com/guide/practices/responsiveness.html