How to get gravity 'bottom' working on a drawable in xml

Question

I have a simple aim. I want a light grey background on my FrameLayout with a black dividing line underneath it (only undernearth, not all around). So far I have this:

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Answer 1

Well, it's pretty old question, but none of the answers seem to answer the actual question (how to make gravity working) so here's a working example:

By analogy, if you want to use gravity left or right change attribute height to width