Android change listview item text color

i'm trying to change some items text color (or backgroung color) in a list view based on a flag . after a long search i didn't find out how to do it , i'm calling the below loop after specific action to change the color:

ListView _listView = (ListView) findViewById(R.id.listView2);

        for (int i=0;i<=_listView.getCount();i++)
        {   
           if(Falg == True)
           {
            //here i want to change the list view item color or backgroud color
           }
        }