在java代码中实现RelativeLayout布局中设置位于父容器底部？

     RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT,50);

                lp.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM,RelativeLayout.TRUE);

                yourRelativelayout.addView(yourImageView,lp);