Some article about background...

 
 // an imageview with scaling...
 ImageView topIcon = new ImageView(ctx);
 topIcon.setImageResource(R.drawable.stlogo);
 topIcon.setAdjustViewBounds(true);
 topIcon.setMaxHeight(TopIconMaxHeight);
 topIcon.setMaxWidth(TopIconMaxWidth);
 topIcon.setScaleType(ScaleType.FIT_CENTER);
 topIcon.setAlpha(TopIconAlpha);
 topIcon.setLayoutParams(
     new LayoutParams(LayoutParams.WRAP_CONTENT,
                      LayoutParams.WRAP_CONTENT));

 // clocks...
 AnalogClock clock = new AnalogClock(ctx);
 clock.setBackground(topIcon.getDrawable());

Full topic is here : http://developerlife.com/tutorials/?p=312