android - Conditionally formating a ListView. Function only works from OnListItemClick(), but not from OnCreate()? -

so have nice little list cursoradapter.

after creation, i'm trying color rows depending on kind of values hold. function below. problem:

if call function "list.setonitemclicklistener()...", runs perfectly.
if call oncreate(), nullpointerexeption on "textview tv = (textview) childview.findviewbyid(r.id.row_eszkoz_leltarozott_allapot);" row.

what causes this?

public void conditionalcoloring() {     (int position=0; position<adapter.getcount(); position++)     {         system.out.println("adapter child szám: " + adapter.getcount());         view childview = list.getchildat(position);          //view childview = adapter.getview(position, null , list);         textview tv = (textview) childview.findviewbyid(r.id.row_eszkoz_leltarozott_allapot);   ///error here         relativelayout rl = (relativelayout) childview.findviewbyid(r.id.row_eszkoz_container);         string s = (string) tv.gettext();         system.out.println("szöveg: " + s);          if (s.equals("leltárazva")) {             int holoblue = activity.getresources().getcolor(android.r.color.holo_blue_light);             rl.getbackground().setcolorfilter(holoblue,porterduff.mode.multiply);         }         else if (s.equals("leltározandó")) {             int hologreen = activity.getresources().getcolor(android.r.color.holo_blue_light);             rl.getbackground().setcolorfilter(hologreen,porterduff.mode.multiply);         }         else if (s.equals("módosítási tranzakció szükséges")) {             int holored = activity.getresources().getcolor(android.r.color.holo_blue_light);             rl.getbackground().setcolorfilter(holored,porterduff.mode.multiply);         }          else {         }     } } 

in cursoradapter override getview()

new simplecursoradapter(getactivity(),                         r.layout.rowlayout,                         null (opt cursor),                         fromcolumns,                         tolayout, 0) {         @override         public view getview(int position, view convertview, viewgroup parent) {             view row = super.getview(position, convertview, parent);             row.findviewbyid(...)                             ...enter code here...             return row;         }  } 

btw, system.out.println() ????

check this: http://developer.android.com/reference/android/util/log.html