Android: how to make keyboard enter button say “Search” and handle its click?

I can’t figure this out. Some apps have a EditText (textbox) which, when you touch it and it brings up the on-screen keyboard, the keyboard has a “Search” button instead of an enter key.

I want to implement this. How can I implement that Search button and detect press of the Search button?

Edit: found how to implement the Search button; in XML, android:imeOptions="actionSearch" or in Java, EditTextSample.setImeOptions(EditorInfo.IME_ACTION_SEARCH);. But how do I handle the user pressing that Search button? Does it have something to do with android:imeActionId?