Android : Use Some Kind Of "external ID" For A View?

I wrote a View class based on ViewSwitcher and now I want to write helper classes for the view like known form the ListView: ListAdapter, ListActivity and so on..

Regarding the activity class I ran into a problem. The ListActivity forces you to add a ListView to your activity with a fixed id: @id/android:list. In my base activity class i want to archive the same, forcing a special id so that my helper classes can access the view object.

As I'm writing a general lib that could be used in various projects I can't use R.id.foobar to get the view as there's no R class. The specific project will an own R.java.

So I peeked at the source code ...

Ok, I could write my on R class, put it directly into my package and try to access it in the same way but I've no clue what value the id should have or need?

Also I couldn't find any R class at android_frameworks_base/core/java/com/android/internal

And even if this problem is solved: How can the user of my lib access "my id" from his layout XML?