title: Shadow Appearance on All Android Versions
body: <p>In <code>Lollipop</code> we set a <code>view</code>'s <code>Shadow</code> by <code>setElevation()</code> method.</p>
  
  <p>But in <code>pre-Lollipop</code>, it doesn't work.</p>
  
  <p>What is the best approach so that the <code>View</code> will have identical look when displayed on <code>pre-lollipop</code> devices and <code>lollipop</code> devices?</p>