How to call JSON Api   Post Response  PostLibResponse.java   Post Listner  LibPostListner.java    Calling API   private PostLibResponse postRequest;  static final int REQUEST_CODE = 1    Map<String, String> parmas = new HashMap<>();                  parmas.put("user_id", userId);                  postRequest = new PostLibResponse(EntertainmentActivity.this, new EntertainmentDataModel(), EntertainmentActivity.this, parmas, URL, REQUEST_CODE);     @Override      public void onPostResponseComplete(Object clsGson, int requestCode) {          dismissProgress();          if (requestCode == REQUEST_CODE) {              if (clsGson != null) {                 mDataModel = (DataModel) clsGson;                  if () {        ...