在 ListActivity 上使用 setEmptyView 时出现问题

我有以下设置，并且空视图文本不会显示......

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
            getListView().setEmptyView(findViewById(R.id.empty));
    getListView().setTextFilterEnabled(true);

    setListAdapter(null);// to have empty list
}

布局文件是：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/myScrollLayout"
    android:layout_width="fill_parent" android:layout_height="fill_parent"
    android:orientation="vertical" xmlns:android="http://schemas.android.com/apk/res/android">
    <FrameLayout android:layout_width="fill_parent"
        android:layout_height="0dip" android:layout_weight="1">
        <ListView android:id="@android:id/list" android:layout_width="fill_parent"
            android:layout_height="fill_parent" android:drawSelectorOnTop="false" />

        <!-- Here is the view to show if the list is emtpy -->
        <ScrollView
            android:id="@android:id/empty" android:layout_width="fill_parent"
            android:layout_height="fill_parent">
            <TextView android:id="@+id/emptyText" android:layout_width="fill_parent"
                android:layout_height="fill_parent" android:text="@string/contact_empty_help"
                android:textSize="20sp" android:textColor="?android:attr/textColorSecondary"
                android:paddingLeft="10dip" android:paddingRight="10dip"
                android:paddingTop="10dip" android:lineSpacingMultiplier="0.92" />
        </ScrollView>
    </FrameLayout>
</LinearLayout>

字符串定义为：

<string name="contact_empty_help">"You don't have any contacts to display.\n\nTo add contacts, you have to:\n
        \n<li><font fgcolor="#ffffffff">Go to <b>Contacts</b></font> application to create new contacts\n</li>
        \n<li><font fgcolor="#ffffffff"><b>Import from VCF file</b></font>, this is available in Contacts menu, the file most be on the root of the SD card\n</li>"
        </string>

由于列表是空的，它应该显示定义的文本。我按照 List8 中的示例进行操作

https://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/view/List8.html
https://developer.android.com/resources/samples/ApiDemos/res/layout/list_8.xml

我缺少一个setContentView(R.layout.listview);因此，findViewById 没有拾取该视图。