Is there a difference between android:layout_centerVertical and android:layout_gravity="center_vertical"?

Question

I guess the title says it all. What is the difference between the two (if there is one) XML attributes and when would one be better used over the other?

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android:layout_gravity="center_vertical"
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and

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android:layout_centerVertical="true"
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Answer 1

Well, layout_centerVertical is only valid for RelativeLayouts. Gravity is also valid for linear layouts, so you could tell a LL with horizontal orientation to center objects vertically that otherwise would be top or bottom aligned.