动态设置布局距离父控件的距离
view= findViewById(R.id.view);
RelativeLayout.LayoutParams layoutParams = (LayoutParams) listview.getLayoutParams();
layoutParams.bottomMargin=0;//将默认的距离底部20dp,改为0,这样底部区域全被listview填满。
view.setLayoutParams(layoutParams);
RelativeLayout就是View的父控件