flutter 实现多布局列表

闲来无事，写个玩安卓的首页，实现多布局、banner的效果。其中涉及知识点侧滑，pageview 切换页面，页面跳转传值及回调数据（在侧滑里）。这些都是基于自己学习做的demo。
当然还有很多瑕疵需要完善。
先看效果：

这里主要讲解多布局，所以其他功能可以参考github
https://github.com/chentaishan/flutter_app

多布局功能代码：

 @override
  void initState() {
    // TODO: implement initState
    super.initState();
    // 获取网络数据 一个banner  一个列表
    initBannerData();
    initHomeList();
  }

  @override
  Widget build(BuildContext context) {
    Widget itemColor = Divider(
      color: Colors.blue,
    );
    Widget nullColor = Divider(
      color: Colors.white,
    );
    return ListView.separated(
      itemCount: _homeListBeanEntity.data.datas.length,
      itemBuilder: (BuildContext context, int index) {
      // 根据规则，抽取banner方法和listitem
        return _bannerBeanData != null && _bannerBeanData.data.length > 0&&index==0
            ? bannerItem(_bannerBeanData)
            : listItem(_homeListBeanEntity, index);
      },
      separatorBuilder: (BuildContext context, int index) {
        return index > 0 ? itemColor : nullColor;
      },
    );
  }

void initBannerData() async {
    result = await getNetWorkData("https://www.wanandroid.com/banner/json");

    print("list=" + result);

    if (result.toString().length > 0) {
      BannerBeanEntity bannerBeanEntity =
          BannerBeanEntity.fromJson(json.decode(result));
      if (bannerBeanEntity != null) {
        setState(() {
          _bannerBeanData = bannerBeanEntity;
        });
      }
    }
  }

getNetWorkData(String url) async {
    var uri = Uri.parse(url);

    HttpClient httpClient = new HttpClient();

    HttpClientRequest request = await httpClient.getUrl(uri);

    HttpClientResponse httpClientResponse = await request.close();

    var str = await httpClientResponse.transform(utf8.decoder).join();

    print(httpClientResponse.toString());

    return str;
  }
  void initHomeList() async {

    result =await getNetWorkData("https://www.wanandroid.com/article/list/0/json");

    print("list=" + result);

    if (result.toString().length > 0) {
      HomeListBeanEntity homeListBeanEntity =
          HomeListBeanEntity.fromJson(json.decode(result));
      if (homeListBeanEntity != null) {
        setState(() {
          _homeListBeanEntity = homeListBeanEntity;
        });
      }
    }
  }