Can you please elaborate some code regarding gravity?

[SoniKarsh]

final int gravity = getGravity();

		if (Gravity.isVertical(gravity)
				&& (gravity & Gravity.VERTICAL_GRAVITY_MASK) == Gravity.BOTTOM) {

			setGravity((gravity & Gravity.HORIZONTAL_GRAVITY_MASK) | Gravity.TOP);
			topDown = false;
		}
		else {

			topDown = true;
		}

If you could just explain to me the use of Gravity.isVertical()? as I couldn't find anything around it.

In google doc, i found that Gravity.isVertical is used to found the gravity pull is vertical or not so if you could just explain mentoined code that would be very helpful thank you...