ListView: How To Make Selected Items Stay 'lit'

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http://stackoverflow.com – I'm using a ListView to display a list of items. I tap on one item to 'select' it, and that item briefly turns orange in the list, but then returns to the background color. How can I cause the item to stay 'lit' until I unselect it (by tapping the item again)? Also, can I call a method that will clear all selected items for that list? (HowTos)