关于flutter listview组件出现无法滚动的问题，求助


items = [];
    for(var item in _patrol_task.patrol_results){
      items.add(new Row(
        children:[
          Expanded(
            flex: 1,
            child: Text("${item.patrol_template_name}") ,),
          Expanded(
            flex: 2,
              child:
            FormBuilderTextField(
              attribute: "patrol_task[patrol_results_attributes][${item.id}][summary]",
              decoration: InputDecoration(labelText: "备注"),
            )
          ),
          Expanded(
            flex: 1,
              child:
              Column(
                children: <Widget>[
                  _image == null
                      ? Text('No image selected.')
                      : Image.file(_image),
                RaisedButton(
                  onPressed: _takePhoto,
                  child: Text("拍照"),
                ),
              ],
            ),
          )
        ],
      ));
    }    return FormBuilder(
            key: _fbKey,
            autovalidate: true,
            child: Scrollbar(
                child:
                SingleChildScrollView(
                  child: ListView(
                      shrinkWrap: true,
                      children: items),)
            )
    );items为包含多个Widget的列表，目前界面可以出现结果就是无法滑动，网上的各种方法都试过，都没有反应，希望有大佬可以看一下哪里出问题了。界面里还会报底部越界错误。希望的效果是，可以滚动，滚动的时候右边出现滚动条。万分感谢。