ListView小部件中的颤振堆栈小部件?

我正在我的应用程序中使用堆栈小部件,它工作得很好,但现在我在将这个堆栈小部件包装到ListView小部件中时遇到了问题。

我出错了

RenderBox was not laid out: RenderPointerListener#20d10 relayoutBoundary=up7 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
'package:flutter/src/rendering/box.dart':
Failed assertion: line 1979 pos 12: 'hasSize'

我的堆栈小部件是

Widget? stackW() {
    return Stack(
      alignment: Alignment.center,
      children: <Widget>[
        Positioned(
          top: 70,
          width: MediaQuery.of(context).size.width * .9,
          height: 150,
          child: Center(
            child: Container(
              width: MediaQuery.of(context).size.width * .9,
              decoration: BoxDecoration(
                  color: Colors.grey[200],
                  borderRadius: BorderRadius.circular(15)),
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  const Text(
                    "Product Designer",
                    style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
                  ),
                  const SizedBox(
                    height: 10,
                  ),
                 
                ],
              ),
            ),
          ),
        ),
        Positioned(
          top: 30,
          left: MediaQuery.of(context).size.width / 2.5,
          width: 80,
          height: 80,
          child: CircleAvatar(
            backgroundColor: Colors.white,
            child: CircleAvatar(
              backgroundColor: Colors.green[100],
              radius: 35,
              child: const FaIcon(
                FontAwesomeIcons.apple,
                size: 30,
                color: Colors.black,
              ),
            ),
          ),
        ),
      ],
    );
  }

当我在体内直接传递stackWidget时,它工作得很好,但在将其包装到ListView中之后,它就产生了问题。

所以请指导我使用堆栈小部件实现listview数据。

 body: stackW()!,  //working

body: ListView(
        scrollDirection: Axis.vertical,
        children: [
          stackW()!,
        ],
      ),
``` //not working