Android: Cannot style spinner divider

Question

I\'m trying to create a theme for my first Android app, and it is driving me round the bend. I finally managed to figure out how to style items in a dropdown list, but now I

Answer 1

I have a very simple Activity with the Spinner and it works for the following. The only difference I see is that you have a 3dp and I don't have that at all.

and in my Activity I have:

    Spinner spinner = (Spinner) findViewById(R.id.spinner);
    List list = new ArrayList();
    list.add("list 1");
    list.add("list 2");
    list.add("list 3");
    ArrayAdapter dataAdapter = new ArrayAdapter(this,
            android.R.layout.simple_spinner_item, list);
    dataAdapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
    spinner.setAdapter(dataAdapter);

and then for the main layout I have the following XML:

Here is the screenshot

If you can't get it to work from there, I can push up the entire thing to a github repo for you.