sample/src/main/java/com/gordonwong/materialsheetfab/sample/Fab.java
@Override
	public void hide() {
		// Only use scale animation if FAB is visible
		if (getVisibility() == View.VISIBLE) {
			// Pivots indicate where the animation begins from
			float pivotX = getPivotX() + getTranslationX();
			float pivotY = getPivotY() + getTranslationY();

			// Animate FAB shrinking
			ScaleAnimation anim = new ScaleAnimation(1, 0, 1, 0, pivotX, pivotY);
			anim.setDuration(FAB_ANIM_DURATION);
			anim.setInterpolator(getInterpolator());
			startAnimation(anim);
		}
		setVisibility(View.INVISIBLE);
	}
@Override
	public void hide() {
		// Only use scale animation if FAB is visible
		if (getVisibility() == View.VISIBLE) {
			// Pivots indicate where the animation begins from
			float pivotX = getPivotX() + getTranslationX();
			float pivotY = getPivotY() + getTranslationY();

			// Animate FAB shrinking
			ScaleAnimation anim = new ScaleAnimation(1, 0, 1, 0, pivotX, pivotY);
			anim.setDuration(FAB_ANIM_DURATION);
			anim.setInterpolator(getInterpolator());
			startAnimation(anim);
		}
		setVisibility(View.INVISIBLE);
	}
Hides the FAB.