If.. Else.. Functions

I want the notifications "Error Submitting Code" to appear when there is error executing the process. How should I edit my code?

Thank you in advance.

            String link = "http://ift.tt/2AK7Xnk";
            new SubmitData().execute(link);
            if ( getActivity().execute(link) == true) {
                Toast.makeText(getActivity(), "Code Submit Successfully", Toast.LENGTH_LONG).show();
            }
            else {
                Toast.makeText(getActivity(), "Error Submitting Code", Toast.LENGTH_LONG).show();
            }