软键盘顶Popup

 private void ShowPopWindow() {
        if (popupWindow.isShowing()) {
            popupWindow.dismiss();
        } else {

            popupWindow.setSoftInputMode(PopupWindow.INPUT_METHOD_NEEDED);
            popupWindow.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
            popupWindow.showAtLocation(view, Gravity.BOTTOM, 0, 0);
            WindowManager.LayoutParams lp = getWindow().getAttributes();
            lp.alpha = 0.2f; //0.0-1.0
            getWindow().setAttributes(lp);
        }
    }