flutter 点击区域放大

当将img设置成可点击事件时，如何让其周边可点击，放大点击区域，需要包裹一层Container并且设置color，不设置color则还是img区域可点击，Container区域不能点击，如下代码：

GestureDetector(
            child: Container(
              height: ScreenUtil.getInstance().getWidth(80),
              width: ScreenUtil.getInstance().getWidth(160),
              alignment: Alignment.centerLeft,
              child: isClick
                  ? Image.asset(Utils.getImgPath("icon_navigation_back_press"))
                  : Image.asset(Utils.getImgPath("icon_navigation_back")),
              padding: EdgeInsets.fromLTRB(
                  ScreenUtil.getInstance().getWidth(20),
                  ScreenUtil.getInstance().getWidth(10),
                  ScreenUtil.getInstance().getWidth(20),
                  ScreenUtil.getInstance().getWidth(10)),
              color: MyColors.transparent,//此处记得要设置
            ),
            onTap: () {
              setState(() {
                isClick = true;
              });
              Navigator.pop(context);
            },
          ),