title: Listview : different padding for header & content
body: <p>I am working on an extensive codebase and I need to add an header to most of its ListViews.<br>
  My trouble is that the header needs to have no padding whereas the existing lists already have a 20dp padding.<br>
  It could setup the listview padding to 0dp &amp; rewrite all the listview content layouts but due to the size of the codebase that's not the preferred option so I am looking for a way to do this by code :<br>
  have a different padding for the header &amp; the content. Does anyone know a way to do this ?</p>
  
  <p>edit : for clarification : I need that header to be a standard listview one that scrolls with the rest of the listview. An independant header would indeed be a trivial problem.</p>