validation method

onHttpRequestListener validate_callback = new onHttpRequestListener() {
        @Override
        public void onHttpResult(ConnectionExecutor.HTTPResponse response, String send_data) {
            DialogUtils.HideLoader();
            if (response.response == ConnectionExecutor.ResponseType.SUCCESS) {
                try {
                    JSONObject jsonObject = (JSONObject) response.data;
                    JsonParser jsonParser = new JsonParser();
                    validateItem item = new validateItem();
                    item = jsonParser.get_validate_response(jsonObject);
                    if (item != null) {
                        if (item.getLog().equals(AppConstants.TAG_VALID)) {
                            DialogUtils.showAlertDialog(validateActivity.this, "Success", "voucher valid and validate Successfully ", true, false);
                        } else if (item.getLog().equals(AppConstants.TAG_VALIDATED)) {
                            DialogUtils.showAlertDialog(validateActivity.this, "Success", "Voucher validated ", true, false);
                        }
                        _VoucherItem.setBalance(item.getBalance());
                        balance_tv.setText("Voucher value " + item.getBalance());
                        validation_items.add(item);
                        adapter.notifyDataSetChanged();
                    }

                } catch (Exception e) {
                    e.printStackTrace();
                }
            } else {
                if ((response.value).equals(AppConstants.ERROR_AUTHENTICATE)) {
                    DialogUtils.showAlertDialog(validateActivity.this, "Action Required", "Your token expired , please re-login", false, true);
                } else {
                    showAlertwithcutomview(response.value);
                }

            }
        }
    };