gistfile1.java

protected void onLayout(boolean changed, int l, int t, int r, int b) {
		super.onLayout(changed, l, t, r, b);
		
		int itemsPerView = getLastVisiblePosition() - getFirstVisiblePosition() + 1;
		if ((getAdapter().getCount() / itemsPerView) > 3) {
			setFastScrollEnabled(true);
			setScrollBarStyle(View.SCROLLBARS_OUTSIDE_INSET);
		}else{
			setFastScrollEnabled(false);
			setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
		}
		
	}