效果图：

GitHub Flutter学习源码：https://github.com/shunyue1320/flutter-study

appbar代码：

appBar: AppBar(
 centerTitle: true,
 //elevation: 0,  //bar底部阴影
 leading: IconButton(
   highlightColor: Colors.transparent, //高亮透明
   splashColor: Colors.transparent, //水波纹透明
   icon: Icon(Icons.list),
   onPressed: () {
    
     //打开抽屉
     _globalKey.currentState.openDrawer();
   }
 ),
 title: Text('天猫TMALL'),
 actions: <Widget>[
   //登入按钮实现方法一
   // FlatButton(
   //   textColor: Colors.white //文字颜色也可以在这里设置
   //   onPressed: () {
    
   //     _globalKey.currentState.openEndDrawer();
   //   },
   //   child: Text(('登录'), style: TextStyle(color: Colors.white))
   // ),
   //登入按钮实现方法二
   //InkWell给child元素绑定点击事件
   InkWell(
     onTap: () {
    
       _globalKey.currentState.openEndDrawer();
     },
     child: Container(
       padding: EdgeInsets.only(right: 20),
       child: Row(
         children: <Widget>[Text('登录')],
       )
     )
   )
 ],
 bottom: PreferredSize(
   preferredSize: Size.fromHeight(50),
   child: Container(
     height: 50,
     padding: EdgeInsets.all(6),
     child: InkWell(
       onTap: () {
    
         //点击搜索触发的点击事件
         Navigator.of(context).push(
           MaterialPageRoute(builder: (BuildContext context) {
    
             return searchPage();
           })
         );
       },
       child: Container(
         color: Colors.white,
         child: Row(
           //mainAxisAlignment: MainAxisAlignment.center, //水平居中
           children: <Widget>[
             SizedBox(width: 10),  //占位标签
             Icon(Icons.search, color: Colors.grey),
             SizedBox(width: 10),  //占位标签
             Text('搜索商品/品牌', style: TextStyle(color: Colors.grey))
           ],
         ),
       ),
     )
   ),
 ),
),
//drawer左边抽屉
drawer: Drawer(),
//drawer右边抽屉
endDrawer: Drawer(),



//模拟跳转的搜索页面
class searchPage extends StatelessWidget {
    
  @override
  Widget build(BuildContext context) {
    
    return Scaffold(
      appBar: AppBar(
        centerTitle: true,
        title: Text('搜索界面')
      ),
       body: Text('假装我是搜索界面的内容'),
    );
  }
}

轮播图代码：

AspectRatio(
  aspectRatio: 16 / 8,
  child: Container(
    // color: Colors.blue,
    child: PageView(
      onPageChanged: (int index) {
    
        //轮播图点击事件
        print('$index');
      },
      children: _indexBanner.map((item) {
    
        return Image.network('${item}'); //这里是图片地址
      }).toList()
    )
  ),
),

//数据格式
List<String> _indexBanner = [
   "http://1.jpg",
   ...
]

网格代码：

Container(
 color: Colors.white60,
 height: 168,
 //网格布局
 child: GridView.count(
   crossAxisCount: 5,
   children: _indexCat.map((item) {
    
     return Container(
       //网格边框
       // decoration: BoxDecoration(
       //   border: Border.all(color: Colors.grey)
       // ),
       child: Column(
         //垂直居中
         mainAxisAlignment: MainAxisAlignment.center,
         children: <Widget>[
           //圆形图片
           ClipOval(
             child: Image.network('${item['pic']}', width: 50, height: 50),
           ),
           Text('${item['con']}', style: TextStyle(fontSize: 12))
         ],
       ),
     );
   }).toList(),
 )
),

//数据格式
 List<Map> _indexCat = [
   {
    'pic': "https://111.png", 'con': "1分夺宝"},
   ...
]