title: Android: how to set the number of items in a GridView
body: <p>I only set the num columns in properties of a GridView. Nowhere to set the number of items</p>
  
  <p>I google but only got some questions about how to fix the rows of GridView. I looking for in API GridView also, but there is no function to do that.</p>
  
  <p>Someone teach me? Thanks</p>