Share View between ListView and ScrollView

Question

I have the following layout:

when I click on Btn 1, the Content will be a ListView, clicking on Btn 2, will show a LinearLayout. My problem is that I want the whole thing to scroll. So if my root is a ScrollView, the content displayed with Btn 2 is fine, but as we know, it ain't working with ListView.

So instead, my root layout includes 2 layouts:

<RelativeLayout id="root">
    <include layout=listViewLayout />
    <include layout=scrollViewLayout />
</RelativeLayout>

And the idea is to have a header view:

such that when the root view is created, I inflate the header, set is as header view to the ListView (working fine), and add it to the ScrollView. But as soon as I add it (technically, it'a added to a LinearLayout inside the ScrollView), then I get the following crash:

java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to android.widget.AbsListView$LayoutParams

Technically, I could have two headers doing exactly the same thing (set picture, set listeners to buttons), but for the sake of avoiding duplication, what are the other alternatives? If I add the header as a row (instead of a using listView.addHeaderView) and modify my adapter to handle different layouts, will it solve the problem?

Thanks!

EDIT: to clarify, when I click on Btn 1 or 2, I simply show / hide the layouts. I don't dynamically modify the ViewGroup. It allows me to show either the ListView + header or the ScrollView. The exception occurs the first time the root is displayed. But if I don't try to add the header view in the ScrollView, then it's programmatically working fine.

EDIT 2: sharing 1 header (View) among 2 ListViews is not working either. From a UI point of view, it looks ok, but the interaction is not (some buttons stop responding to click). Also, I can't have only 1 ListView because the content is pulled from the web, which means I'll have to store / restore everything each time I switch between views.

Answer 1

Turns out that the only way to achieve this it to duplicate the header (create 2 instances of the same View)...

Answer 2

You should never put a listView inside a scrollView (or the opposite).

You'd better watch the lecture "the world of listView" to learn how you should handle such cases.

One way to handle it is to either have a header for the listView, or create a new viewType for each special row you wish to create.