android - How to make spinner items disable -

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i want make spinner item un-selectable or disabled how possible if using arrayadapter: 

arrayadapter<string> adptr= new arrayadapter<string>(getactivity(),r.layout.custom_spinner_text,list);

list.add("select one");// want disable .when click on should not selected

list.add("hello");

you can override isenabled(int position) of arrayadapter , return false disable specific item. example:

 @override     public boolean isenabled(int position) {         if (position == 4 )            return false;                    return true;     }

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