java - Android listview items -

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I have a list view and there are some items in it (usually 7-10 people). Each item contains a checkbox I want to intersect all the items in this list view and check all those checkboxes. I try to do this: 

  list view list = (list view) Find VVBID (RID). Int count = list.getCount (); (Int i = 0; i

But when I == 4 I have NullPointerException. I think that when I use the getChildAt method, I can only get the items displayed on the screen and on the screen Provides zero for items that do not fit. Can I get all the items from the list view and not just on the screen?


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