private ArrayList<HashMap<String, String>> ParseJSON(String json) {
    if (json != null) {
        try {
            // Hashmap for ListView
            ArrayList<HashMap<String, String>> studentList = new ArrayList<HashMap<String, String>>();

            JSONObject jsonObj = new JSONObject(json);

            // Getting JSON Array node
            JSONArray students = jsonObj.getJSONArray(TAG_STUDENTINFO);

            // looping through All Students
            for (int i = 0; i < students.length(); i++) {
                JSONObject c = students.getJSONObject(i);

                String id = c.getString(TAG_ID);
                String name = c.getString(TAG_NAME);
                String email = c.getString(TAG_EMAIL);
                String address = c.getString(TAG_ADDRESS);
                String gender = c.getString(TAG_GENDER);

                // Phone node is JSON Object
                JSONObject phone = c.getJSONObject(TAG_PHONE);
                String mobile = phone.getString(TAG_PHONE_MOBILE);
                String home = phone.getString(TAG_PHONE_HOME);

                // tmp hashmap for single student
                HashMap<String, String> student = new HashMap<String, String>();

                // adding each child node to HashMap key => value
                student.put(TAG_ID, id);
                student.put(TAG_NAME, name);
                student.put(TAG_EMAIL, email);
                student.put(TAG_PHONE_MOBILE, mobile);

                // adding student to students list
                studentList.add(student);
            }
            return studentList;
        } catch (JSONException e) {
            e.printStackTrace();
            return null;
        }
    } else {
        Log.e("ServiceHandler", "Couldn't get any data from the url");
        return null;
    }
}