title: Custom error popup for TextView/EditText in HoloEverywhere?
body: <p>In HoloEverywhere, is there a way to change the background drawable of the popup which is triggered through <code>TextView.setError(...)</code>?</p>
  
  <p><img src="https://i.stack.imgur.com/VL1TX.png" alt="Error popup"></p>
  
  <p>Note: The default (non-HoloEverywhere) <code>TextView</code>/<code>EditText</code> uses internal resources for the popup and thus cannot be styled easily.</p>