How to create a Widget.Holo.Spinner-style widget in v7

Question

I have a Button that I want to style like a Holo-style spinner, i.e. underlined with a triangle in the bottom right corner - the built-in contacts app for examp

Answer 1

User "ozi" got me there, unfortunately his answer got deleted because it was just a link.

The trick is to use a custom attribute and override it with a v11-specific section. Here's the basic setup if you use themes:

In values/attr.xml:

You create your Spinner-Button like this:

And here's the key: You have different values in the theme depending on whether or not you have v11:

In values/themes.xml:

In values-v11/themes.xml:

If you don't use themes, your setup is almost identical - you just use styles.xml, create a specific style for your button, and use that.

In pre-v11, this will create an old-style spinner, but that's actually good - a v11 spinner would look out of place in pre-v11 environment.