LoginService service = ServiceGenerator.createService(LoginService.class);
   
   
      Call<String> login = service.login(json.toString(),android_id);
                                    login.enqueue(new Callback<String>() {
                                        @Override
                                        public void onResponse(Call<String> call, Response<String> response) {
                                            if (response.isSuccessful()) {
                                                Log.d(TAG, response.body());
                                               


                                              } else {
                                                  APIError error = ErrorUtils.parseError(response);

                                                int code = response.code();
                                                if (code == 401) {
                                                    progressBar.setVisibility(View.GONE);
                                                    Toast.makeText(LoginActivity.this, "UserName or  Password Incorrect", Toast.LENGTH_SHORT).show();
                                                }


                                                


                                            }

                                        }

                                        @Override
                                        public void onFailure(Call<String> call, Throwable t) {
                                            Toast.makeText(LoginActivity.this, t.getLocalizedMessage(), Toast.LENGTH_SHORT).show();
                                            
                                        }
                                    });