What is the difference between screen and view in the context of these two methods?

I have a button and I want to get the x coordinate of its center.

I guess this would be enough:

public int getButtonXPosition() {
    return (button.getLeft()+button.getRight())/2;
}

but then, what difference would it make if I would have used

getLocationOnScreen() or getLocationInWindow() ?

(adding half of the button's width to that, of course)

java android view screen
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