底部阴影到ListPopupWindow android

Question

我正在使用ListPopupWindow并希望为其添加底部阴影。以下是我的代码 -

    listPopupWindow = new ListPopupWindow(getApplicationContext());
    listPopupWindow.setContentWidth(500);
    listPopupWindow.setDropDownGravity(Gravity.CENTER | Gravity.RIGHT);
    listPopupWindow.setSelection(mSelectedPos);
    listPopupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
        @Override
        public void onDismiss() {
            listPopupWindow.dismiss();
        }
    });
    Listpopupadapter adapter = new Listpopupadapter(mContext, mGameSortList, GameName, mFilterStr,mListener,Gravity.RIGHT);
    listPopupWindow.setAdapter(adapter);
    listPopupWindow.setAnchorView(mRightTV);
    listPopupWindow.setForceIgnoreOutsideTouch(true);
    listPopupWindow.show();

显示弹出窗口时如何显示底部阴影。

TIA

Answer 1

listPopupWindow.setBackgroundDrawable(new ColorDrawable(Color.BLACK));