This is neither a code-question nor technical issue, so I admit that it can be somewhat off-topic with StackOverflow, but I’m in really need of help because I already took lots of time.
I’m working with a help window implementation and I’d like to do this with a type of view that I’ve seen in some of Android button options. In some versions of Ubuntu, the view can also be seen when you point your mouse arrow within an application shortcut in the main taskbar. It looks like a balloon-type dialog box. Bellow is a screenshoot of the view:

My issue is a somewhat softheaded one: I don’t know the technical name of this UI component, and so I can’t search for documentations and examples.
I’ve already searched for several combinations of terms such as dialog-box, menu, balloon, popup-menu and so on, without success. Can someone tell me the name of this UI and, if possible, post a simple example of usage in Android/Java?
Thanks in advance!
There’s no native UI with that approach but, you can use any viewgroup you prefer (depending on the content of it) and set the background of this viewgroup to be a 9 patch drawable.