title: Android gridview clear/refresh contents
body: <p>I have a gridview that loads when the app loads.  The user can click on a button which gets other data to load into the gridview.</p>
  
  <ol>
  <li>I want to clear the gridview before the other data is loaded. I can't figure this out.</li>
  <li>I guess fixing #1 will take care of this, but when i DO click on the button to reload the grid, it doesnt refresh the grid.  I know it's loading the data into the grid though, and this is the weird part, there just happens to be a search textview on the screen and when i click on that and the keyboard comes up, the new rows are appended to the existing rows in the grid.  It's the only time the grid is updated.</li>
  </ol>