title: How to make the notification background transparent?
body: <p>I use a RemoteView to display some content in the notification area, but I want it's background to be transparent, just like the app Notification Weather.</p>
  
  <p>I try to set the background color to transparent and alpha to 0, but no use...</p>
  
  <p><img src="https://i.stack.imgur.com/V1r6G.png" alt="Notify"></p>
  
  <p>How can I do the same effect?</p>
  
  <p>Thanks.                                   </p>