title: How to add Panel in android?
body: <p>I want to add a panel in android activity.I'll try explain its behaviour.  </p>
  
  <p>It should show small arrow on right side of my activity, If i click on that a panel having few buttons should slide out consuming around 20%-30% of current activity.  </p>
  
  <p>Somewhat same like menu appears on screen. </p>
  
  <p>Thanks in advance.</p>