如何在flutter中将嵌套的JSON api响应显示为网格视图？

Question

我正在使用flutter构建一个应用程序。我想在gridview中显示gridview，我想要一个数据列表视图。我有一个JSON Api，响应是这样的。

它是一个对象的数组。我想在该gridview中的listview中的gridview和services属性中显示对象的title和price属性。我正在使用Futurebuilder。我很困惑在Futurebuilder里面我应该使用gridview.count还是gridviewbuilder。为了实现listview，我应该在ListViewbuilder或gridviewbuilder下使用gridview.count吗？有任何其他想法来实现这一目标

     "title": "EXPRESS 2",
     "price": 500,
     "services": [
       {
         "_id": "5ca07706e8f4c521f0010567",
         "serviceId": "5c9081e3ae535e0c549fa0fe",
         "name": "DENT SECTION"
       },
       {
         "_id": "5ca07706e8f4c521f0010566",
         "serviceId": "5c90820aae535e0c549fa100",
         "name": "ELECTRICAL SYSTEM"
       }
     ],
     "id": "5ca07706e8f4c521f0010565"
   },```

Answer 1

GridView.count：创建一个可滚动的2D小部件数组，在横轴上有固定数量的切片

和

GridView.builder：创建按需创建的可滚动的2D小部件数组。

So use the GridView.builder

并尝试此代码绑定您的数据

 GridView.builder(
      shrinkWrap: true,
      itemCount: itemDataList.length,
      gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2,childAspectRatio: 0.6),
      itemBuilder: (BuildContext context, int index){
        return Card(
          elevation: 6.0,
          child: Column(
            mainAxisSize: MainAxisSize.max,
            mainAxisAlignment: MainAxisAlignment.start,
            crossAxisAlignment: CrossAxisAlignment.start,
            children: <Widget>[
              Center(
                child: Text(itemDataList[index].title),
              ),

              displayItem("id ", itemDataList[index].id),
              displayItem("price ", itemDataList[index].price.toString()),
              ListView.builder
                (
                  physics: NeverScrollableScrollPhysics(),
                  shrinkWrap: true,
                  itemCount: itemDataList[index].services.length,
                  itemBuilder: (BuildContext ctxt, int indx) {
                    return new Column(
                      mainAxisSize: MainAxisSize.max,
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: <Widget>[
                        Divider(
                          height: 2,
                          color: Colors.black,
                        ),
                        displayItem("_Id", itemDataList[index].services[indx].sId),
                        displayItem("Service Id", itemDataList[index].services[indx].serviceId),
                        displayItem("Service name", itemDataList[index].services[indx].name),
                      ],
                    );
                  }
              ),
            ],
          ),
        );
      },
    ),
  )



Widget displayItem(String key, String value){
    return Padding(
      padding: const EdgeInsets.all(2.0),
      child: Text('$key : $value', style: TextStyle(fontSize: 11),),
    );
  }