title: Android: Add button at very end of the gridview
body: <p>I have a grid view which shows some items. The user can scroll down and up. I want to be able to show a button at the very end of the grid view when the user has scrolled to the end. This button will not show when the user is not at the bottom of the grid. How can this be done ?</p>
  
  <p>When the user is not at the end, the grid should look like this
  <img src="https://i.stack.imgur.com/d3aZJ.png" alt="enter image description here"></p>
  
  <p>and upon reaching the end of the gridview, a button should be added as a footer to gridview.</p>
  
  <p><img src="https://i.stack.imgur.com/KYScg.png" alt="enter image description here"></p>