Suppose I have a TabActivity, containing some other activities. However, at the bottom of the screen, I'd like to have a set of buttons that are common to all the tabs (perhaps an OK button or something). Is there any way of doing this? (almost like if the tabs where placed in a LinearLayout, so first I have the tabs/their content, and then some buttons below)

I have never worked with a TabActivity, but you could try to use margins/paddins. Little example can be found here: Layout technique: Static elements below ScrollView