PopupWindow点击外部区域不能消失的解决办法

	private void showOrderByView() {
		// TODO Auto-generated method stub
		String[] items = new String[] { "智能排序", "好评优先", "离我最近", "优惠价最低" };
		LinearLayout lyt = (LinearLayout) LayoutInflater.from(getActivity())
				.inflate(R.layout.test, null);
		ListView list = (ListView) lyt.findViewById(R.id.listView1);
		list.setSelector(new ColorDrawable(Color.TRANSPARENT));
		list.setAdapter(new ListAdapter(getActivity(), items));

		mPopWin = new PopupWindow(lyt, view.getWidth() / 2,
				LayoutParams.WRAP_CONTENT, true);
		mPopWin.setBackgroundDrawable(new BitmapDrawable());
		mPopWin.showAsDropDown(lblOrderBy);
		mPopWin.setOutsideTouchable(true);
		mPopWin.setFocusable(true);
		mPopWin.update();
	}

setBackgroundDrawable方法一点要在new PopupWindow后立即调用！！