如何在Android AbsoluteLayout中以编程方式控制子视图的大小

http://code.google.com/android/reference/android/widget/AbsoluteLayout.html

onLayout(boolean changed, int l, int t, int r, int b)
//Called from layout when this view should assign a size and position to each of its children. 

@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
    Log.d("test", "In MainLayout.onLayout");
    int childCount = getChildCount();
    for (int childIndex = 0; childIndex < childCount; childIndex++) {
        getChildAt(childIndex).setLayoutParams(new LayoutParams(100, 100, 100, 100));
    }
    super.onLayout(changed, l, t, r, b);
}

我在XML中声明布局的子元素(按钮)。

这正确地设置了按钮的位置,但没有设置大小。大小取自XML中定义的内容(这是一个必需的属性)。