title: is there any diff @null Vs #00000000
body: <p>Is there any difference between @null Vs transparent(#00000000)</p>
  
  <p>in my layout I set <code>android:background"@color/transparent"</code> 
  but its showing some other different background color that I used.</p>
  
  <p>when I used null its working fine.</p>
  
  <p>I want to set @null thru programmatic. </p>
  
  <p>how to do?</p>