I had a scienario to change size of seekbar by changing the visibility of surrounding views. Took a while but below is small code snipped which may be helpful for sme1...

RelativeLayout.LayoutParams abc=new RelativeLayout.LayoutParams(526,30); 
abc.addRule(RelativeLayout.CENTER_VERTICAL);
abc.addRule(RelativeLayout.RIGHT_OF,R.id.pause); 
mSeekBar.setLayoutParams(abc);