java - 当以编程方式添加视图时，RelativeLayout 会忽略上述规则。如何修复此错误？

Question

这是代码片段：

//The view is created manually
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
myListView = (ListView) inflater.inflate(R.layout.my_lv_layout, null, false);

... //the ListView is prepared (that part of my program works)

RelativeLayout.LayoutParams myListViewParams = 
            new RelativeLayout.LayoutParams(width, height);

myListViewParams.addRule(RelativeLayout.ABOVE, R.id.button_at_the_bottom_of_the_relative_layout);

//the listView is added here, but it is not above the button, but in the upper
//left corner of the screen (the above-rule is simply ignored) 
myRelativeLayout.addView(myListView, myListViewParams);

（但规则RelativeLayout.ALIGN_PARENT_RIGHT在这里确实有效）

在文件my_lv_layout.xml中除了宽度和高度属性之外没有定义任何规则。

我怎么解决这个问题？