如何在 Flutter 中设置 Row() 的背景 colored颜色

我试图为Row()小部件设置背景色，但Row本身没有背景色或 colored颜色 属性.我已经能够将一个容器的背景 colored颜色 设置为灰色，就在紫色背景文本之前，但是文本本身并没有完全填充背景，下面的间隔符也没有任何 colored颜色 .

那么，如何将Row Background设置为"HexColor(COLOR_LIGHT_GREAY)"值，使其跨越整行呢？

有什么 idea 吗？非常感谢!

以下是我到目前为止拥有的代码:

import 'package:flutter/material.dart';
import '../manager/ShoppingListManager.dart';
import '../model/ShoppingListModel.dart';
import '../hexColor.dart';
import '../Constants.dart';

class ShoppingListWidget extends StatelessWidget {
  final Color color = Colors.amberAccent;
  final int shoppingListIndex;

  ShoppingListWidget({this.shoppingListIndex});

  @override
  Widget build(BuildContext context) {
    ShoppingListManager slm = new ShoppingListManager();
    String shoppingListName =
        slm.myShoppingLists.shoppingLists[shoppingListIndex].name;
    int categoryCount =
        slm.myShoppingLists.shoppingLists[shoppingListIndex].categories.length;

    return Scaffold(
      appBar: AppBar(
        title: Text(shoppingListName),
        automaticallyImplyLeading: true,
      ),
      body: ListView.builder(
        itemBuilder: (context, index) {
          Category cat = slm.myShoppingLists.shoppingLists[shoppingListIndex]
              .categories[index];

          return Container(
            decoration: new BoxDecoration(
              border: new Border.all(color: Colors.grey[500]),
              color: Colors.white,
            ),
            child: new Column(
              children: <Widget>[
                getCategoryWidget(context, cat),
                getCategoryItems(context, cat),
              ],
            ),
          );
        },
        itemCount: categoryCount,
      ),
    );
  }

  // Render the category "headline" row where I want to set the background color
  // to HexColor(COLOR_LIGHT_GREY)
  Widget getCategoryWidget(BuildContext context, Category cat) {
    return new Row(
      children: <Widget>[
        new Container(height: 40.0, width: 10.0, color: HexColor(cat.color)),
        new Container(
            height: 40.0, width: 15.0, color: HexColor(COLOR_LIGHT_GREY)),
        new Container(
          child: new Text("Category", textAlign: TextAlign.start,
            style: TextStyle(
                fontFamily: 'Bold',
                fontSize: 18.0,
                color: Colors.black),
          ),
          decoration: new BoxDecoration(
            color: Colors.purple,
          ),
          height: 40.0,
        ),
        Spacer(),

        CircleAvatar(
          backgroundImage:
              new AssetImage('assets/icons/food/food_settings.png'),
          backgroundColor: HexColor(COLOR_LIGHT_GREY),
          radius: 15.0,
        ),
        new Container(height: 15.0, width: 10.0, color: Colors.transparent),
      ],
    );
  }

  // render the category items
  Widget getCategoryItems(BuildContext context, Category cat) {
    return ListView.builder(
      itemBuilder: (context, index) {
        String itemName = "Subcategory";
        return new Row(children: <Widget>[
          new Container(height: 40.0, width: 5.0, color: HexColor(cat.color)),
          new Container(height: 40.0, width: 20.0, color: Colors.white),
          new Container(
            child: new Text(itemName),
              color: Colors.white,
          ),
          Spacer()
        ]);
      },
      itemCount: cat.items.length,
      shrinkWrap: true,
      physics:
          ClampingScrollPhysics(),
    );
  }

}