The chapter 10 downloads include an ActionBarDropDownActivity, which seems to be intended to display a dropdown list of numbers, but I don't see the dropdown when I run it. How can I get it to show up?

Also, where is figure 10.7 taken from?

Thanks.

It's okay. I fixed it. I didn't realise the activities are set up to be run standalone.

Although, actually, I would still like to know where figure 10.7 comes from, because I'd like to add checkboxes into the dropdown.