title: How to implement adding footer on demand to ListView when loading data
body: <p>everyone.
  I want to show the footer like "Loading..." when user reaches bottom of the list.
  Now I only managed to determine when we are on the last element. Then trouble comes. We need to set up footer before setting adapter, we need to hide it afterwards. Does anyone have solution to this?
  May be this issue is already discussed, but I haven't found an answer.</p>