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For example, in case of the following tag in xml layout, android:scrollbarSize is ignored.
<ScrollView
        android:layout_width="wrap_content" android:layout_height="fill_parent"
        android:fadeScrollbars="false"
        android:scrollbarThumbVertical="@drawable/thumb01"
        android:scrollbarSize="20px"
>

For your information, drawable/thumb01.xml is the following for example.
<shape xmlns:android="http://schemas.android.com/apk/res/android">
        <solid android:color="#FF0000"/>
        <corners android:radius="4px"/>
</shape>

But it works well when android:scrollbarThumbHorizontal attribute is added in the same ScrollView tag.
For example below.
<ScrollView
        android:layout_width="wrap_content" android:layout_height="fill_parent"
        android:fadeScrollbars="false"
        android:scrollbarThumbVertical="@drawable/thumb01"
        android:scrollbarThumbHorizontal="@drawable/thumb01"
        android:scrollbarSize="20px"
>

Of course, android:scrollbarThumbHorizontal means nothing in this case.

I believe that this problem is caused by View class of android.view package.

Hereinafter, the target version is Android 2.3 (Gingerbread).

The problem is in source code of View.java, several lines from 5940 line.
The "size" variable is the size of "horizontal" scrollbar of 5940 line.
But, this variable seems to be used as the size of "vertical" scrollbar at 5972 and 5974 lines.
It is necessary to get the size of vertical scrollbar before 5972 line, is it ?