相关疑难解决方法(0)

我有一个小部件,它有一个图像元素和扩展的表单元素列表视图,当我填写并滚动数据时它会在图像后面滚动时消失.我在调试时没有抛出任何错误,它发生在滚动窗口小部件顶部图像后面的任何字段上.有任何想法吗？

@override
  Widget build(BuildContext context) {
    var _children = <Widget>[
      new Center(
        child: new Text(widget.prov.fname + widget.prov.lname,
          style: new TextStyle(fontSize: 20.0, fontWeight: FontWeight.bold),
        ),
      ),
      new Center(
          child: new Container(
            padding: new EdgeInsets.only(
                left: 125.0, right: 125.0, bottom: 50.0),
            child: new Image.network('http://$baseurl:8080/getimage/'+widget.prov.pic.assetName),
          )
      ),

      new Form(
          key: _formKey,
          autovalidate: _autovalidate,
          onWillPop: _warnUserAboutInvalidData,
          child: new Expanded(
              child: new ListView(
                padding: const EdgeInsets.symmetric(horizontal: 16.0),
                children: <Widget>[
                  new TextFormField(
                    decoration: const InputDecoration(
                      icon: const Icon(Icons.person),
                      hintText: 'First Name?',
                      labelText: 'First Name *',
                    ), …