Using dialog fragment to show dialog

DialogFragment.java

   DialogFragment dg = new DialogFragment() {
                        @Override
                        public Dialog onCreateDialog(Bundle savedInstanceState) {
                            return new AlertDialog.Builder(getActivity())
                                    .setMessage(R.string.submit_confirm_message)
                                    .setPositiveButton(R.string.submit_confirm_button, new DialogInterface.OnClickListener() {
                                        @Override
                                        public void onClick(DialogInterface dialogInterface, int i) {
                                            /*---THIS IS ADDED EXTRA--------*/
                                            postInfoToServer();
                                        }
                                    })
                                    .setNegativeButton(android.R.string.cancel, null)
                                    .create();
                        }
                    };
                    dg.show(getSupportFragmentManager(), "place_order_dialog");