title: is possible to create a transparent info window with map v2?
body: <p>Hieveryone, one question.I apply the background of infowindows like this:</p>
  
  <p><code>android:background="#55000000"</code></p>
  
  <p>but there seems to be a white background always behind it, is it possible to get rid of that?
  Thank you!</p>
  
  <p><img src="https://i.stack.imgur.com/nUEve.png" alt="enter image description here"></p>