title: how to click Background and something should happend?
body: <p>I want to click the Background of a layout (not clicking anywhere, for example in the top right) and then reproduce a sound, can i put an empty View and put an On Click to that? I think is not possible.
  If is possible, there is a better way? 
  I want to put some invisible "buttons" at the Background because I will put an image Background with shapes, that's why It couldn't be anywhere.
  Thanks and sorry for my english.</p>