Android listview with inflated checkboxes not checking all true at once -

i retrieving contacts , displayed in listview using simplecursoradapter. listview displayed in main.xml , textview , checkboxes in listview.xml. main.xml have 2 buttons, named selectall, clearall on click event should check checkboxes true , false respectively. button click listener event calls inflated view access checkbox still not checking true. pls help!

thanks in advance!

when inflate view, it's not access it, it's creating it, , can't access check boxes cause don't generate of them, you'll need hold data model holds data selected.