android - How to dynamically change item text color in gridlist with custom adapter? -

i have adapter present list of items. need change text color of items on firstposition , secondposition. data list doesn't change, can't use notifydatasetchanged. how can this?

this method getview in adapter

public view getview(int position, view convertview, viewgroup parent) {     viewholder holder;     if (convertview == null){         convertview = layoutinflater.from(context).inflate(r.layout.alphabet_item, parent, false);         holder = new viewholder();         holder.lettertextview = (textview) convertview.findviewbyid(r.id.letter_text);         convertview.settag(holder);     }     holder = (viewholder) convertview.gettag();     holder.lettertextview.settext(string.valueof(alphabetlist.get(position)));     if (firstposition == position) {         holder.lettertextview.settextcolor(context.getresources().getcolor(r.color.coloraccent));     } else if (secondposition == position){         holder.lettertextview.settextcolor(context.getresources().getcolor(r.color.colorprimary));     } else {         holder.lettertextview.settextcolor(context.getresources().getcolor(r.color.colortext));     }     return convertview; } 

the firstposition , secondposition declare integer

i didnot question exactly. think need @ "firstposition" && "secondposition" want set color.

for need check both position in same if condition

if(position == firstposition || position == secondposition){       holder.txtview.settextcolor(colorid); }