android - Creating headers in custom ArrayAdapter from values passed to constructor -

i have list of items database ordered rooms:

list<item> items = database.getallitemsorderedbyroom(); 

every item has roomid, , few other properties.

and have customitemsarrayadapter works items doesn't create headers.

what want create list not items, room headers based on values passed inside items. work like:

long actualroom = null; for(item item : items){     long itemroom = item.getroom;     if(itemroom != actualroom){          actualroom = itemroom;          list.putroomheader(actualroom);          list.putitem(item);     } else {           list.putitem(item);     } } 

i have working inside customitemsarrayadapter after using constructor: adapter = new customitemsarrayadapter(context, items); stumbled upon explanation how headers: android listview headers , makes me prepare values list before creating adapter , unconvenient if use few similar lists in app.

is there way of processing values inside constructor of costomitemsarrayadapter?

use expandable list view,

visit http://developer.android.com/reference/android/widget/expandablelistadapter.html

use groupview section.