title: 50% opacity at white background for textview
body: <p>I am trying to set  <code>#ffffff</code>(white) background at 50% opacity to TextView.<br>
  I tried to use <code>android:alpha=0.5</code> but it's also making text 50% transparent.  </p>
  
  <p>I need to set 50% opacity at white background.<br>
  I find one tutorial <a href="https://stackoverflow.com/questions/11285961/how-to-make-a-background-transparent-20-in-android">Here</a> but don't understand that much.  </p>
  
  <p>Please provide me any reference. 
  Thanks in Advance.  </p>