Button gumb = this.findViewById(R.id.btnAktivacijeAkt);
     gumb.setOnClickListener(new View.OnClickListener() {
            @RequiresApi(api = Build.VERSION_CODES.KITKAT)
            @Override
            public void onClick(View v) {

                   new MyTask().execute(LICENCE_KEY, tokenName);
                  /* Toast toast = Toast.makeText(getApplicationContext(), "Provjera", Toast.LENGTH_SHORT);
                    toast.show();*/
            }
        });