title: android how to align buttons?
body: <p>i have three buttons so some size, now i need to put the 4th button below the 2nd button and aligned center of the 4th button with the center of the 2nd button.</p>
  
  <p>i am having a little trouble doing that, any ideas?</p>
  
  <pre> 
  
  !---!---!---!
  !   !   !   !
  !---!---!---!
    !-------!
    !       !
    !-------!
  
  </pre>
  
  <p>i have been playing around with gravity and align center and stuff but still could not find what i need.
  This thing is not letting me post without a few more lines. I wonder if adding this line would make a difference?</p>