title: Android:To set an item as selected when the ListView opens?
body: <p>An activity has a Button and a ListView.
  Initially, only the Button is visible. When the button is pressed, the ListView is displayed. 
  When displayed, is it possible for me to show one particular item as selected/focussed?</p>
  
  <p>A use case could be that suppose it is a list of language settings and when the list opens, the currently selected language must be shown as highlighted.</p>
  
  <p>If I know the index of the item, how to set it as focused on display?</p>