java - Android展开视图ontouch of button

Question

我想像 exapnd 和 collapse 那样动态更改视图高度，并且按钮的位置（y）也应该改变..它就像移动按钮并根据那个扩展视图..
我的代码是......

button.setOnTouchListener(new OnTouchListener() {
@Override
        public boolean onTouch(View v, MotionEvent event) {
            if (event.getAction() == MotionEvent.ACTION_MOVE) {
                 int height = (int) event.getY();
                 android.widget.RelativeLayout.LayoutParams lpview =
                 (android.widget.RelativeLayout.LayoutParams) view
                 .getLayoutParams();
                 android.widget.RelativeLayout.LayoutParams lpbutton =
                 (android.widget.RelativeLayout.LayoutParams) button
                 .getLayoutParams();
                 lpbutton.topMargin = height;
                 button.setLayoutParams(lpbutton);
                 lpview.height = height;
                 view.setLayoutParams(lpview);

            } 
            return true;
        }
    });

但我的问题是在扩展时它不能顺利扩展......有什么建议吗？？？？