在dart / Flutter中将List分成n个元素数组的组，并将其传递到Flutter中的相应小部件 以下代码用于显示列表内容

如何解决在dart / Flutter中将List分成n个元素数组的组，并将其传递到Flutter中的相应小部件 以下代码用于显示列表内容

此代码用于通过传递列表来调用Widget。

    var widgets1 = new List();
  Random random = Random();

  List<Widget> listWidgets(
      String title,String url,String img,VoidCallback push) {
    if(img == null){img="";}
    return [
      Column1(title: title,url: url,image: img,push: push),ColumnOneNew(title: title,Column2(title: title,img: img,Column3(title: title,push: push)
    ];
  }
  
   @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: new Column(
        children: <Widget>[
               new Expanded(
              child: new ListView.builder
                (
                  controller: this._scrollController,itemCount: _list.length == null ? 0 : this._list.length + 1,itemBuilder: (BuildContext ctxt,int index) => buildBody(ctxt,index)
              )
          )
        ],)
    );
  }
  
  Widget buildBody(BuildContext ctxt,int i) {

    if (i < this._list.length) {
    
                  widgets1 = listWidgets(
                      _list[i].title,_list[i].src,_list[i].img,widget.push);
                  return widgets1[random.nextInt(4)];
                } else {
                  return this.more(context);// return something else 
                }

  }

以下代码用于显示列表内容

class Column3 extends StatefulWidget {
  final String img;
  final String url;
  final String title;
  VoidCallback push;

  Column3({this.title,this.url,this.img,this.push});
  @override
  State<StatefulWidget> createState() {
      return _Column3();
  }
}

class _Column3 extends State<Column3> {
  @override
  Widget build(BuildContext context) {
     return InkWell(
      onTap: () {
        widget.push();

        Navigator.push(
            context,MaterialPageRoute(
                builder: (_) => new ExternalWidgetWithWebView(
                      url: widget.url,title: widget.title,)));
      },child: Container(
        child: GridView.count(
            shrinkWrap: true,physics: NeverScrollableScrollPhysics(),crossAxisSpacing: 0.0,crossAxisCount: 3,childAspectRatio: MediaQuery.of(context).size.width / 600,children: new List<Widget>.generate(3,(index) {
              return SafeArea(
                  child: Padding(
                      padding: const EdgeInsets.symmetric(
                          vertical: 2.0,horizontal: 5.0),child: Container(
                          child: Row(children: <Widget>[
                        Expanded(
                            child: Container(
                                width: MediaQuery.of(context).size.width * 0.5,decoration: BoxDecoration(
                                  shape: BoxShape.rectangle,border: Border.all(
                                    color: Colors.grey,width: 1,),child: Column(
                                    crossAxisAlignment:
                                        CrossAxisAlignment.stretch,children: <Widget>[
                                      Container(
                                          height: MediaQuery.of(context)
                                                  .size
                                                  .height *
                                              0.15,width:
                                              MediaQuery.of(context).size.width,decoration: BoxDecoration(
                                            color: Colors.white,margin: EdgeInsets.all(5.0),child: Image.network(
                                            widget.img,fit: BoxFit.fill,errorBuilder:
                                                (BuildContext context,Object exception,StackTrace stackTrace) {
                                              return new Row(
                                                crossAxisAlignment: CrossAxisAlignment.center,mainAxisAlignment: MainAxisAlignment.center,children: <Widget>[
                                                  new Text(
                                                    'No Image',style: new TextStyle(
                                                        fontSize: 16.0,fontFamily: 'Roboto',color: Colors.black
                                                    ),)
                                                ],);
                                            },)),Expanded(
                                        child: Padding(
                                          padding: EdgeInsets.symmetric(
                                            horizontal: 5.0,child: Container(
                                            height: MediaQuery.of(context)
                                                    .size
                                                    .height *
                                                0.1,child: Text(
                                              widget.title,style: TextStyle(fontSize: 8.0),textAlign: TextAlign.justify,])))
                      ]))));
            })),);
  }
}

我要实现的是将数组拆分为3列3列显示，2列2列显示，并将其传递给相应的小部件。实际上，我希望列表将其内容显示为随机的列内容（一列，两列或3列）。