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flutter实现跨平台电商app

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app地址:https://github.com/dezhizhang/xiaozhi

服务端地址https://github.com/dezhizhang/eureka

pc端页面 https://www.guicaioa.com/

开源不易如果对你有帮助你可以请我喝杯咖啡

如有问题请加微信私聊

Center组件

2020-10-17

名称	或能
alignment	topCenter：顶部居中对齐
	topLeft：顶部左对齐
	topRight：顶部右对齐
	center：水平垂直居中对齐
	centerLeft：垂直居中水平居左对齐
	centerRight：垂直居中水平居右对齐
	bottomCenter 底部居中对齐
	bottomLeft：底部居左对齐
	bottomRight：底部居右对齐
decoration	decoration: BoxDecoration( color: Colors.blue,border: Border.all( color: Colors.red, width: 2.0, ),borderRadius: BorderRadius.all( Radius.circular(8.0) ))
margin	margin 属性是表示 Container 与外部其他 组件的距离。
	EdgeInsets.all(20.0)
padding	padding 就 是 Container 的 内 边 距 ， 指 Container 边缘与 Child 之间的距离
	Container 边缘与 Child 之间的距离 padding: EdgeInsets.all(10.0)
transform	让 Container 容易进行一些旋转之类的

Text 组件

名称	或能
textAlign	文本对齐方式（center 居中，left 左 对齐，right 右对齐，justfy 两端对齐）
textDirection	文本方向（ltr 从左至右，rtl 从右至 左）
overflow	文字超出屏幕之后的处理方式（clip 裁剪，fade 渐隐，ellipsis 省略号）
textScaleFactor	字体显示倍率
maxLines	文字显示最大行数
style	字体的样式设置
decoration	文字装饰线（none 没有线，lineThrough 删 除线，overline 上划线，underline 下划线）
decorationColor	文字装饰线颜色
decorationStyle	文字装饰线风格（[dashed,dotted]虚线， double 两根线，solid 一根实线，wavy 波浪 线）
wordSpacing	单词间隙（如果是负值，会让单词变得更紧凑

图片组件

Image.asset， 本地图片
Image.network 远程图片

Image 组件的常用属性:

名称	类型	说明
alignment	Alignment	图片的对齐方式
color 和 colorBlendMode		设置图片的背景颜色，通常和 colorBlendMode 配合一起 使用，这样可以是图片颜色和背景色混合。上面的图片就 是进行了颜色的混合，绿色背景和图片红色的混合
fit	BoxFit	fit 属性用来控制图片的拉伸和挤压，这都是根据父容器来 的。BoxFit.fill:全图显示，图片会被拉伸，并充满父容器。 BoxFit.contain:全图显示，显示原比例，可能会有空隙。 BoxFit.cover：显示可能拉伸，可能裁切，充满（图片要 充满整个容器，还不变形）。BoxFit.fitWidth：宽度充满（横向充满），显示可能拉伸， 可能裁切。 BoxFit.fitHeight ：高度充满（竖向充满）,显示可能拉 伸，可能裁切。 BoxFit.scaleDown：效果和 contain 差不多，但是此属 性不允许显示超过源图片大小，可小不可大。
repeat	平铺	ImageRepeat.repeat : 横向和纵向都进行重复，直到铺满整 个画布。 ImageRepeat.repeatX: 横向重复，纵向不重复。
width		宽度一般结合 ClipOval 才能看到效果
height		高度一般结合 ClipOval 才能看到效果

class HomeContent extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
   return Center(
     child: Container(
       width: 300,
       height: 300,
       decoration: BoxDecoration(
         color: Colors.pink,
         border: Border.all(
           color:Colors.yellow,
           width:2
         )
       ),
       child: Image.network(
         'http://tugua.oss-cn-hangzhou.aliyuncs.com/16006151939994201.jpeg',
         fit: BoxFit.cover,
         alignment: Alignment.center,
         color: Colors.yellow,
         colorBlendMode: BlendMode.multiply,

       ),
     ),
     
   );
  }
}

实现圆角图片

class HomeContent extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child: Container(
        width: 300,
        height: 300,
        decoration: BoxDecoration(
          color: Colors.pink,
        ++image: DecorationImage( //重点是这二行代码
            image:  NetworkImage(
                'http://tugua.oss-cn-hangzhou.aliyuncs.com/16006151939994201.jpeg'
            ),
            fit: BoxFit.cover
          ),
          borderRadius: BorderRadius.circular(150)
        ),
      ),
    );
  }
}

实现圆解图片的第二种方式

class HomeContent extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child: Container(
        width: 300,
        height: 300,
        child: ClipOval(
          child: Image.network(
            'http://tugua.oss-cn-hangzhou.aliyuncs.com/16006151939994201.jpeg',
            width: 150,
            height: 150,
            fit: BoxFit.cover,
            ),
        ),
      ),
    );
  }
}

 引入本地图片

然后，打开 pubspec.yaml 声明一下添加的图片文件，注意要配置对

示例代码

class HomeContent extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
   return Center(
     child: Container(
       child: Image.asset('images/avator.png'),
     ),
   );
  }
}

Flutter 列表组件概述

列表布局是我们项目开发中最常用的一种布局方式。Flutter 中我们可以通过 ListView 来定义 列表项，支持垂直和水平方向展示。通过一个属性就可以控制列表的显示方向。列表有一下 分类：

1、垂直列表
2、垂直图文列表
3、水平列表
4、动态列表
5、矩阵式列表

Flutter 列表参数

名称	类型	说明
scrollDirection	Axis	Axis.horizontal 水平列表 Axis.vertical 垂直列表
padding	EdgeInsetsGeometry	内边距
resolve	bool	组件反向排序
children	List	列表元素

Flutter 基本列表

class HomeContent extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return ListView(
      padding: EdgeInsets.all(10),
      children: <Widget>[
        ListTile(
          leading: Icon(Icons.search,color: Colors.pink,size: 60),
          title: Text(
            '新闻标题1',
            style: TextStyle(
              fontSize: 18,
              color:Colors.pink
            ),
          ),
          subtitle: Text('新闻内容新闻内容新闻内容新闻内容新闻内容新闻内容新闻内容'),
        ),
        ListTile(
          leading: Icon(Icons.home,color: Colors.yellow,size: 60),
          title: Text('新闻标题1'),
          subtitle: Text('新闻内容新闻内容新闻内容新闻内容新闻内容新闻内容新闻内容'),
        ),
        ListTile(
          leading: Icon(Icons.settings,color: Colors.green,size: 60),
          title: Text('新闻标题1'),
          subtitle: Text('新闻内容新闻内容新闻内容新闻内容新闻内容新闻内容新闻内容'),
        )
      ],
    );
  }
}

ListView实现动态列表

class HomeContent extends StatelessWidget{
  List<Widget> _getData() {
    List<Widget> list = new List();
    for(var i=0;i < 100;i++) {
      list.add(
          ListTile(
          leading: Image.network('http://tugua.oss-cn-hangzhou.aliyuncs.com/16007371732208143.jpeg'),
          title: Text('新闻标题${i}'),
          subtitle: Text('新闻内容新闻内容新闻内容新闻内容新闻内容新闻内容新闻内容'),
        ),
      );
    }
    return list;
  }
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return ListView(
      children: this._getData()
    );
  }
}

GridView组件

名称	类型	说明
scrollDirection	Axis	滚动方法
padding	EdgeInsetsGeometry	内边距
resolve	bool	组件反向排序
crossAxisSpacing	double	水平子 Widget 之间间距
mainAxisSpacing	double	垂直子 Widget 之间间距
crossAxisCount	int	一行的 Widget 数量
childAspectRatio	double	子 Widget 宽高比例
children		[ ]
gridDelegate	SliverGridDelegateWithFix	控制布局主要用在 GridView.builder 里面

Padding组件

属性	说明
padding	padding 值, EdgeInsetss 设置填充的值
child	子组件

示例代码

lass HomeContent extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
   return GridView.count(
     crossAxisCount: 2,
     childAspectRatio: 1.5,
     children: <Widget>[
        Padding(
          padding: EdgeInsets.fromLTRB(10, 10, 10, 10),
          child:  Image.network(
            'http://tugua.oss-cn-hangzhou.aliyuncs.com/16007371732208143.jpeg'
            ,fit: BoxFit.cover
          ),
        ),
        Padding(
          padding: EdgeInsets.fromLTRB(10, 10, 10, 10),
          child: Image.network(
            'http://tugua.oss-cn-hangzhou.aliyuncs.com/16007371732208143.jpeg',
            fit: BoxFit.cover
          ),
        ),
     ],
   );
  }
}

Row 水平布局组件

属性	说明
mainAxisAlignment	主轴的排序方式
crossAxisAlignment	次轴的排序方式
children	组件子元素

示例代码

class HomeContent extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Container(
      width: 750,
      height: 800,
      color: Colors.green,
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.center,
        children: <Widget>[
          IconContent(Icons.home,color:Colors.pink),
          IconContent(Icons.search,color: Colors.yellow),
          IconContent(Icons.settings,color: Colors.blue),
        ],
      ),
    );
  }

Stack 组件

属性	说明
alignment	配置所有子元素的显示位置
children	子组件

示例代码

class HomeContent extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child: Container(
        width: 300,
        height: 400,
        color: Colors.red,
        child: Stack(
          children: <Widget>[
            Align(
              alignment:Alignment.topLeft,
              child: Icon(Icons.home,size: 40,color: Colors.white),
            ),
            Align(
              alignment:Alignment.center,
              child: Icon(Icons.search,size: 40,color: Colors.white),
            ),
            Align(
              alignment:Alignment.bottomRight,
              child: Icon(Icons.settings,size: 40,color: Colors.white),
            )
          ],
        ),
      ),
    );
  }
}

Card 组件

Card 是卡片组件块，内容可以由大多数类型的 Widget 构成，Card 具有圆角和阴影，这让它 看起来有立体感。

属性	说明
margin	外边距
child	子组件
Shape	Card 的阴影效果，默认的阴影效果为圆角的 长方形边

示例代码

class HomeContent extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
   return ListView(
     children: <Widget>[
       Card(
         margin: EdgeInsets.all(10),
         child: Column(
           children: <Widget>[
             AspectRatio(
               aspectRatio: 16/9,
               child:  Image.network(
                 'http://tugua.oss-cn-hangzhou.aliyuncs.com/16007371921474207.jpeg',
                 fit: BoxFit.cover,
                ),
             ),
             ListTile(
              //  leading: ClipOval(
              //    child: Image.network(
              //      'http://tugua.oss-cn-hangzhou.aliyuncs.com/16007371921474207.jpeg',
              //      fit: BoxFit.cover,
              //     ),
              //  ),
              leading: CircleAvatar(
                backgroundImage: NetworkImage('http://tugua.oss-cn-hangzhou.aliyuncs.com/16007371921474207.jpeg'),
              ),
               title: Text('晓智商城'),
               subtitle: Text('hello'),
             )
           ],
         ),
       )
     ],
   );
  }
}

Wrap组件

属性	说明
direction	主轴的方向，默认水平
alignment	主轴的对其方式
spacing	主轴方向上的间距
textDirection	文本方向
verticalDirection	定义了 children 摆放顺序，默认是 down，见 Flex 相关属性介绍。
runAlignment	run 的对齐方式。run 可以理解为新的行或者 列，如果是水平方向布局的话，run 可以理解 为新的一行
runSpacing	run 的间距

示例代码

class HomeContent extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Wrap(
      spacing: 10,
      runSpacing: 10,
      children: <Widget>[
        RaisedButton(
          child: Text('第一集'),
          onPressed: () {
            print('第一集');
          },
        ),
        RaisedButton(
          child: Text('第二集'),
          onPressed: () {
            print('第二集');
          },
        ),
        RaisedButton(
          child: Text('第三集'),
          onPressed: () {
            print('第三集');
          },
        )
      ],
    );
  }
}

有状态组件

class HomeContent extends StatefulWidget{
  @override
  HomeContent({Key key}):super(key:key);
  _HomeContent createState() => _HomeContent();
  
}

class _HomeContent extends State<HomeContent>{
  int count = 0;
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Column(
      children: <Widget>[
        SizedBox(height: 200),
        Chip(
          label: Text('${this.count}'),
        ),
        SizedBox(height: 20),
        RaisedButton(
          child: Text('按钮'),
          onPressed: () {
            setState(() {
              this.count++;
            });
          },
        )
      ],
    );
  }
}

底部导航

class Tabs extends StatefulWidget{
  Tabs({Key key}):super(key:key);
  _Tabs createState() =>_Tabs();
}

class _Tabs extends State<Tabs>{
  int _currentIndex = 0;
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      appBar: AppBar(
        title: Text('晓智商城'),
      ),
      body: Text('晓智商城'),
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: this._currentIndex,
        onTap: (index) {
          setState(() {
            this._currentIndex = index;
          });
        },
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            title: Text('首页')
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.category),
            title: Text('分类')
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.search),
            title: Text('搜索')
          )
        ],
      ),
    );
  }
}

进度条

class HomeContent extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child: Padding(
        padding: EdgeInsets.all(10),
        child: LinearProgressIndicator(
          backgroundColor: Colors.pink,
          valueColor: AlwaysStoppedAnimation(Colors.green),
        ),
      ),
    );
  }
}

命名路由

class MyApp extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('晓智商城'),
        ),
        body: HomeContent(),
      ),
      routes: {
        '/form':(context) => FormPage()
      },
      theme: ThemeData(
        primarySwatch: Colors.blueGrey
      ),
    );
  }
}

class HomeContent extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child: RaisedButton(
        color: Colors.pink,
        child: Text('跳转到form表单页'),
        onPressed: () {
          Navigator.pushNamed(context, '/form');
        },
      ),
    );
  }
}

路由传参

import 'dart:ui';

import 'package:flutter/material.dart';

import './pages/form.dart';
import './pages/search.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget{
  final routes = {
    '/form':(context) => FormPage(),
    '/search':(context,{arguments}) => SearchPage(arguments:arguments),
  };
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title:Text('晓知商城')
        ),
        body: HomeContent(),
      ),
      onGenerateRoute: (RouteSettings settings) {
        final String name = settings.name;
        final Function pageContentBuilder = this.routes[name];
        if(pageContentBuilder != null) {
          if(settings.arguments != null) {
            final Route route = MaterialPageRoute(
              builder: (context) => pageContentBuilder(context,
              arguments:settings.arguments
            )
            );
            return route;
          } else {
            final Route route = MaterialPageRoute(
              builder: (context) => pageContentBuilder(context)
            );
            return route;
          }
        } 
      },
      theme: ThemeData(
        primarySwatch: Colors.pink
      ),
    );
  }
}

class HomeContent extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child: Column(
        children: <Widget>[
          RaisedButton(
            child: Text('跳到表单'),
            color: Colors.pink,
            onPressed: () {
              Navigator.pushNamed(context, '/form');
            },
          ),
          RaisedButton(
            child: Text('跳到搜索'),
            color: Colors.yellow,
            onPressed: () {
              Navigator.pushNamed(context, '/search',arguments: {
                "id":456
              });
            },
          )
        ],
      ),
    );
  }
}

AppBar 自定义顶部按钮图 标、颜色

属性	描述
leading	在标题前面显示的一个控件，在首页通常显示应用 的 logo；在其他界面通常显示为返回按钮
title	标题，通常显示为当前界面的标题文字，可以放组 件
actions	通常使用 IconButton 来表示，可以放按钮组
bottom	通常放 tabBar，标题下面显示一个 Tab 导航栏
backgroundColor	导航背景颜色
iconTheme	图标样式
textTheme	文字样式
centerTitle	标题是否居中显示

示例代码

import 'package:flutter/material.dart';
class AppBarPage extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: Text('表单页面'),
          centerTitle: true,
          backgroundColor: Colors.pink,
          leading: IconButton(
            icon: Icon(Icons.backup_sharp),
            onPressed: () {

            },
          ),
        ),
      ),
    );
  }
}

自定义TabBar实现顶部Tab切换

属性	描述
tabs	显示的标签内容，一般使用Tab对象,也可以是其他的Widget
controller	TabController对象
isScrollable	是否可滚动
indicatorColor	指示器颜色
indicatorWeight	指示器高度
indicatorPadding	底部指示器的 Padding
indicator	指示器 decoration，例如边框等
indicatorSize	指示器大小计算方式，TabBarIndicatorSize.label 跟文 字等宽,TabBarIndicatorSize.tab 跟每个 tab 等宽
labelColor	选中 label 颜色
labelStyle	选中 label 的 Style
labelPadding	每个 label 的 padding 值
unselectedLabelColor	未选中 label 颜色
unselectedLabelStyle	未选中 label 的 Style

示例代码

import 'package:flutter/material.dart';


class TopBarPage extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: DefaultTabController(
        length: 4,
        child: Scaffold(
          appBar: AppBar(
            title: Text('晓智商城'),
            bottom: TabBar(
              // isScrollable: true,
              tabs: <Widget>[
                Tab(text: '热门'),
                Tab(text: '推荐'),
                Tab(text: '好卖'),
                Tab(text: '好评'),
              
              ],
            ),
          ),
          body: TabBarView(
            children: <Widget>[
              ListView(
                children: <Widget>[
                  ListTile(title: Text('这是热门')),
                
                ],
              ),
               ListView(
                children: <Widget>[
                  ListTile(title: Text('这是推荐')),
                 
                ],
              ),
               ListView(
                children: <Widget>[
                  ListTile(title: Text('这是好卖')),
                 
                ],
              ), 
              ListView(
                children: <Widget>[
                  ListTile(title: Text('这是好评')),
                
                ],
              )
            ],
          ),
        ),
      ),

    );
  }
}

动态tabs切换

import 'package:flutter/material.dart';

class AppBarController extends StatefulWidget{
  @override
 AppBarController({Key key}):super(key:key);
 _AppBarController createState() => _AppBarController();

}

class _AppBarController extends State<AppBarController> with SingleTickerProviderStateMixin{
  TabController _tabController;

  @override
  void initState() { 
    super.initState();
    this._tabController = TabController(vsync: this,length: 2);
  }

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: DefaultTabController(
        length: 2,
        child:  Scaffold(
        appBar: AppBar(
          title: Text('顶部tab切换'),
          bottom: TabBar(
            controller: this._tabController,
              tabs: <Widget>[
              Tab(
                child: Text('热门'),
              ),
              Tab(
                child: Text('推荐'),
              )
            ],
          ),
        ),
        body: TabBarView(
          controller: this._tabController,
          children: <Widget>[
            Center(
              child: Text('热门'),
            ),
            Center(
              child: Text('推荐'),
            )
          ],
        ),
      )
      ),
    );
  }
  
}

draw组件

import 'package:flutter/material.dart';

class DrawerPage extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: Text('组件'),
          centerTitle: true,
          backgroundColor: Colors.pink,

        ),
        drawer: Drawer(
          child: Text('Drawer'),
        ),
        body: HomeContent(),
      ),
    );
  }
}

 class HomeContent extends StatelessWidget {
  const HomeContent({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      child:Text('body')
    );
  }
}

TextField 文本框组件

属性	描述
maxLines	设置此参数可以把文本框改为多行文本框
onChanged	文本框改变的时候触发的事件
decoration	hintText 类似 html 中的 placeholder border 配置文本框边框 OutlineInputBorder 配合使用 labelText lable 的名称 labelStyle 配置 lable 的样式
obscureText	把文本框框改为密码框
controller	controller 结合 TextEditingController()可以配置表单默认显示的内容

示例代码

class TextFieldPage extends  StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('表单页'),
        ),
        body: HomeContent(),
      )
    );
  }
}


class HomeContent extends StatefulWidget{
  _HomeContent createState() => _HomeContent();
}

class _HomeContent extends State<HomeContent>{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Padding(
      padding:  EdgeInsets.all(20),
      child: Column(
        children: <Widget>[
          TextField(),
          SizedBox(height: 10),
          TextField(
            maxLines: 4,
            decoration: InputDecoration(
              hintText: '请输入姓名',
              border: OutlineInputBorder()
            ),
          ),
          TextField(
            obscureText: true,
            decoration: InputDecoration(
              hintText: '请输入',
              labelText: '用户名',
              icon: Icon(Icons.people)
            ),
          )
        ],
      ),
    );
  }
}

获取表单的值

class _HomeContent extends State<HomeContent>{
  String _description = '';
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Padding(
      padding: EdgeInsets.all(10),
      child: Column(
        children: <Widget>[
          TextField(
            maxLines: 4,
            decoration: InputDecoration(
              hintText: '请输入',
              border: OutlineInputBorder()
            ),
           onChanged: (value) {
             setState(() {
               this._description = value;
             });
           },
          ),
          SizedBox(height: 10),
          Container(
            width: double.infinity,
            child:RaisedButton(
            color: Colors.pink,
            textColor: Colors.white,
            child: Text('登录'),
            onPressed: () {
              print(this._description);
            },
          ),
          )
         
        ],
      ),
    );
  }
}

Checkbox组件

属性	描述
value	true 或者 false
onChanged	改变的时候触发的事件
activeColor	选中的颜色、背景颜色
checkColor	选中的颜色、Checkbox 里面对号的颜色

示例代码

import 'package:flutter/material.dart';

class CheckBoxPage extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('多选按钮'),
        ),
        body: HomeContent(),
      ),
    );
  }
}

class HomeContent extends StatefulWidget{
  _HomeContent createState() => _HomeContent();
}

class _HomeContent extends State<HomeContent>{
  bool _flag = false;
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Padding(
      padding: EdgeInsets.all(10),
      child:  Column(
        children: <Widget>[
          Checkbox(
            value: this._flag,
            onChanged: (value) {
              setState(() {
                this._flag = value;
              });
            } ,
          ),
          SizedBox(height: 10),
          Container(
            width: double.infinity,
            child: RaisedButton(
            child: Text('登录'),
            color: Colors.pink,
            textColor: Colors.white,
            onPressed: () {
              print(this._flag);
            },
          ),
          )
         
        ],
      )
    );
  }
}

CheckboxListTile组件

属性	描述
value	true 或者 false
onChanged	改变的时候触发的事件
title	标题
subtitle	二级标题
secondary	配置图标或者图片
selected	选中的时候文字颜色是否跟着改变

示例代码

import 'package:flutter/material.dart';

class CheckBoxListTilePage extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('多选接钮组'),
        ),
        body: HomeContent(),
      ),
    );
  }
}

class HomeContent extends StatefulWidget{
  _HomeContent createState() =>_HomeContent();
}

class _HomeContent extends State<HomeContent>{
  bool _isSelected = false;
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Padding(
      padding: EdgeInsets.all(10),
      child: Column(
        children: <Widget>[
          CheckboxListTile(
            value: this._isSelected,
            title: Text('flutter'),
            subtitle: Text('flutter学习'),
            activeColor: Colors.red,
            onChanged: (value) {
              setState(() {
                this._isSelected = value;
              });
            },
          )
        ],
      ),
    );
  }
}

Flutter 日期和时间戳

日期转化成时间戳：

var now = new DateTime.now(); 
print(now.millisecondsSinceEpoch);//单位毫秒，13 位时间戳

时间戳转化成日期

var now = new DateTime.now(); 
var a=now.millisecondsSinceEpoch; 
print(DateTime.fromMillisecondsSinceEpoch(a))

Flutter 轮播图组件

轮播图地址

import 'dart:ui';

import 'package:flutter/material.dart';
import 'package:flutter_swiper/flutter_swiper.dart';

class SwierPage extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: Text('轮播图组件'),
        ),
        body: HomeContent(),
      ),
    );
  }
}

class HomeContent extends StatefulWidget{
  @override
 _HomeContent createState() => _HomeContent();
}


class _HomeContent extends State<HomeContent>{
  List<Map> list = [
      {
        "url":"http://tugua.oss-cn-hangzhou.aliyuncs.com/16006152692596188.jpeg"
      },
      {
        "url":"http://tugua.oss-cn-hangzhou.aliyuncs.com/16007371732208143.jpeg"
      }
    ];
  @override
  Widget build(BuildContext context) {
    return Container(
      child: AspectRatio(
        aspectRatio: 16 / 9,
        child: Swiper(
          itemBuilder: (BuildContext context,int index){
            return Image.network(list[index]['url'],fit:BoxFit.fill);
          },
          itemCount: list.length,
          pagination: SwiperPagination(),
          autoplay: true,
          control: SwiperControl(),
        ),
      ),
    );
  }
}

AlertDialog

import 'package:flutter/material.dart';

class DialogPage extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: Text('轮播图组件'),
        ),
        body: HomeContent(),
      ),
    );
  }
}

class HomeContent extends StatefulWidget{
  _HomeContent createState() => _HomeContent();
}

class _HomeContent extends State<HomeContent>{
  alertDialog() async {
    showDialog(
    context: context,
    builder: (context) {
      return AlertDialog(
        title: Text('温馨提示'),
        content: Text('您确定要删除吗？'),
        actions: <Widget>[
          FlatButton(
            child: Text('取消'),
            onPressed: () {
              Navigator.pop(context);
            },
          ),
          FlatButton(
            child: Text('确定'),
            onPressed: () {
              Navigator.pop(context);
            },
          )
        ],
      );
    }
  );
  }
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Container(
      child:Column(
        children: <Widget>[
          RaisedButton(
            child: Text('alertDialog'),
            textColor: Colors.white,
            color: Colors.pink,
            onPressed: () {
              this.alertDialog();
            },
          )
        ],
      )
    ),
    );
  }
}

SimpleDialog

simpleDialog () async {
    showDialog(
      context: context,
      builder: (context) {
        return SimpleDialog(
          title: Text('单选按钮'),
          children: <Widget>[
            SimpleDialogOption(
              child:Text('option A'),
              onPressed:() {
                Navigator.pop(context);
              }
            ),
            SimpleDialogOption(
              child:Text('option B'),
              onPressed:() {
                Navigator.pop(context);
              }
            )
          ],
        );
      }
    );
  }

showModalBottomSheet

  bottomSheet () async {
    showModalBottomSheet(
      context: context, 
      builder: (context){
        return Container(
          child: Column(
            children: <Widget>[
              ListTile(
                title: Text('分享A'),
              ),
              ListTile(
                title: Text('分享B'),
              )
            ],
          ),
        );
      });
  }

Flutter JSON 字符串和 Map 类型的 转换

var mapData={"name":"张三","age":"20"}; 
var strData='{"name":"张三","age":"20"}';
print(json.encode(mapData)); //Map 转换成 Json 字符串 
print(json.decode(strData)); //Json 字符串转化成 Map 类型

示例代码

import 'package:flutter/material.dart';
import 'package:dio/dio.dart';
import 'dart:convert';
import 'package:flutter_swiper/flutter_swiper.dart';

class DiaoPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: Text('diao组件'),
        ),
        body: HomeContent(),
      ),
    );
  }
}

class HomeContent extends StatefulWidget{
  _HomeContent createState() => _HomeContent();
}

class _HomeContent extends State<HomeContent>{
  List  list = [];
  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    this.getData();
  }
  getData() async{
    var apiURL = 'https://www.guicaioa.com/api/focus/info';
    Response response = await Dio().get(apiURL);
    setState(() {
      this.list = response.data['data'];
    });
  }
  @override
  Widget build(BuildContext context) {
    return  Container(
      child: AspectRatio(
        aspectRatio: 16 / 9,
        child: Swiper(
          itemBuilder: (BuildContext context,int index) {
            return Image.network(list[index]['url'],fit: BoxFit.cover);
          },
          itemCount: list.length,
          pagination: SwiperPagination(),
          autoplay: true,
        ),
       
      ),
    );
  }
}

上拉刷新

import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:dio/dio.dart';

class NewsPage extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: Text('news组件'),
        ),
        body: HomeContent(),
      ),
    );
  }
}

class HomeContent extends StatefulWidget{
  _HomeContent createState()=>_HomeContent();
}

class _HomeContent extends State<HomeContent>{
  List list = [];
  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    this._getData();
  }
  _getData() async {
    var apiURL = 'http://www.phonegap100.com/appapi.php?a=getPortalList&catid=20&page=1';
    Response response = await Dio().get(apiURL);
    setState(() {
      this.list = json.decode(response.data)['result'];
    });
  }
  Future<void> _onRefresh() async{
    await Future.delayed(Duration(milliseconds:200),(){
      this._getData();
    });
  }
  @override
  Widget build(BuildContext context) {
    return this.list.length > 0 ?
      RefreshIndicator(
        onRefresh: _onRefresh,
        child:ListView.builder(
          itemCount: this.list.length,
          itemBuilder: (context,index) {
            return ListTile(
              title: Text('${this.list[index]['title']}'),
            );
          }
        ) 
      ):Text('加载中');
  }
}

下拉刷新

import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:dio/dio.dart';

class NewsPage extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: Text('news组件'),
        ),
        body: HomeContent(),
      ),
    );
  }
}

class HomeContent extends StatefulWidget{
  _HomeContent createState()=>_HomeContent();
}

class _HomeContent extends State<HomeContent>{
  int page = 1;
  List list = [];
  ScrollController _scrollController = new ScrollController();
  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    this._getData();
    _scrollController.addListener(() {
      if(_scrollController.position.pixels >= _scrollController.position.maxScrollExtent - 50) {
        print('hello');
        this._getData();
      }
     
    });
  }
  _getData() async {
    var apiURL = 'http://www.phonegap100.com/appapi.php?a=getPortalList&catid=20&page=${this.page}';
    Response response = await Dio().get(apiURL);
    setState(() {
      this.list.addAll(json.decode(response.data)['result']); 
      this.page++;
    });
  }
  Future<void> _onRefresh() async{
    await Future.delayed(Duration(milliseconds:200),(){
      this._getData();
    });
  }
  @override
  Widget build(BuildContext context) {
    return this.list.length > 0 ?
      RefreshIndicator(
        onRefresh: _onRefresh,
        child:ListView.builder(
          controller: this._scrollController,
          itemCount: this.list.length,
          itemBuilder: (context,index) {
            return ListTile(
              title: Text('${this.list[index]['title']}'),
            );
          }
        ) 
      ):Text('加载中');
  }
}

设置信息

本地数据的保存与获取

import 'package:shared_preferences/shared_preferences.dart';

class Storage{
  static Future<void> setString(key,value) async {
    SharedPreferences sp = await SharedPreferences.getInstance();
    sp.setString(key, value);
  }
  static Future<String> getString(key) async {
    SharedPreferences sp = await SharedPreferences.getInstance();
    return sp.getString(key);
  }
}

import 'package:flutter/material.dart';
import './utils/storage.dart';

class StoragePage extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('本地存储'),
        ),
        body: HomeContent(),
      ),
    );
  }
}


class HomeContent extends StatefulWidget{
  _HomeContent createState() =>_HomeContent();
}

class _HomeContent extends State<HomeContent> {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child: Column(
        children: <Widget>[
          RaisedButton(
            child: Text('保存数据'),
            color: Colors.pink,
            onPressed: () async{
              await Storage.setString('username', 'hello');
            },
          ),
          RaisedButton(
            child: Text('获取数据'),
            color: Colors.yellow,
            onPressed: () async{
              var username = await Storage.getString('username');
              print(username);
            },
          )
        ],
      ),
    );
  }
}

form表单提交数据

import 'dart:ui';

import 'package:flutter/material.dart';


void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('晓智商城'),
        ),
        body: HomeContent(),
      ),
      theme: ThemeData(
        primarySwatch: Colors.blue
      ),
    );
  }
}


class HomeContent extends StatefulWidget{
  _HomeContent createState() => _HomeContent();
}

class _HomeContent extends State<HomeContent>{
  TextEditingController _unameController = new TextEditingController();
  TextEditingController _pwdController = new TextEditingController();
  GlobalKey _formKey = new GlobalKey<FormState>();
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Padding(
      padding: EdgeInsets.all(10),
      child: Form(
        key: _formKey,
        autovalidate: true,
        child: Column(
          children: <Widget>[
            TextFormField(
              autofocus: true,
              controller: _unameController,
              decoration: InputDecoration(
                labelText: '用户名',
                hintText: '请输入用户名',
                icon: Icon(Icons.person)
              ),
              validator: (value){
                return value.trim().length > 0 ? null:"用户名不能为空";
              },
            ),
            TextFormField(
              controller: _pwdController,
              decoration: InputDecoration(
                labelText: '密码',
                hintText: '请输入密码',
                icon: Icon(Icons.lock),
              ),
              obscureText: true,
              validator: (value) {
                return value.trim().length > 5 ? null:"密码不能小于6位";
              },
            ),
            Padding(
              padding: EdgeInsets.only(top:10),
              child: Row(
                children: [
                  Expanded(
                    child:Builder(builder: (context){
                      return RaisedButton(
                        child: Text('登录'),
                        color: Colors.pink,
                        textColor: Colors.white,
                        onPressed: () {
                          if(Form.of(context).validate()) {
                            print('提交数据');
                          }
                        },
                      );
                    }),
                  )
                ],
              ),
            )
          ],
        ),
      ),
    );
  }
}

进度条

class HomeContent extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Padding(
      padding: EdgeInsets.all(10),
      child: Column(
      children: <Widget>[
        LinearProgressIndicator(
          backgroundColor: Colors.grey[200],
          valueColor: AlwaysStoppedAnimation(Colors.blue),
        ),
        SizedBox(height: 100),
        LinearProgressIndicator(
          backgroundColor:Colors.pink[100],
          valueColor: AlwaysStoppedAnimation(Colors.pink),
        )
      ],
    )
    );
  }
}

class HomeContent extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Padding(
      padding: EdgeInsets.all(10),
      child: Column(
        children: <Widget>[
          CircularProgressIndicator(
            backgroundColor: Colors.grey[200],
            valueColor: AlwaysStoppedAnimation(Colors.pink),
          )
        ],
      ),
    );
  }
}

渐变按钮

class HomeContent extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return DecoratedBox(
      decoration: BoxDecoration(
        gradient: LinearGradient(colors: [Colors.red,Colors.orange[700]]),
        borderRadius: BorderRadius.circular(3.0),
        boxShadow: [
          BoxShadow(
            color: Colors.black54,
            offset: Offset(2,2),
            blurRadius: 4.0
          )
        ]
      ),
      child: Padding(
        padding: EdgeInsets.symmetric(horizontal:80,vertical:18),
        child: Text("Login",style: TextStyle(color: Colors.white)),
      ),
    );
  }
}

listView

class HomeContent extends StatelessWidget{
  Widget divider1 = Divider(color: Colors.blue);
  Widget divider2 = Divider(color: Colors.red);
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return ListView.separated(
      itemBuilder: (BuildContext context,int index) {
        return ListTile(title: Text('${index}'));
      }, 
      separatorBuilder: (BuildContext context,int index) {
        return index % 2 == 0 ? divider1:divider2;
      }, 
      itemCount: 100
    );
  }
}

固定头布局

class HomeContent extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Column(
      children: <Widget>[
        ListTile(title: Text('商品列表')),
        Expanded(
          child: ListView.builder(
            itemBuilder: (BuildContext context,int index) {
              return ListTile(title: Text("${index}"));
            }
          ),
        )
      ],
    );
  }
}

底部弹框

class HomeContent extends StatelessWidget{
  Future<int> _showModalBottomSheet(context) {
    return showModalBottomSheet<int>(
      context: context,
      builder: (BuildContext context) {
        return ListView.builder(
          itemCount: 30,
          itemBuilder: (BuildContext context,int index) {
            return ListTile(
              title: Text('${index}'),
              onTap: () => Navigator.of(context).pop(),
            );
          },
        );
      }
    );
  }
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child: Column(
        children: <Widget>[
          RaisedButton(
            child: Text('hello'),
            onPressed: () async{
              int type = await _showModalBottomSheet(context);
            },
          )
        ],
      ),
    );
  }
}

loading组件

class HomeContent extends StatelessWidget{
  Future<int> _showLoadingDialog(context) {
    return showDialog(
      context: context,
      barrierDismissible: true,
      builder: (context) {
        return AlertDialog(
          content: Column(
            mainAxisSize: MainAxisSize.min,
            children: <Widget>[
              CircularProgressIndicator(),
              Padding(
                padding: EdgeInsets.only(top:26),
                child: Text('正在加载中'),
              )
            ],
          ),
        );
      }
    );
  }
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child: Column(
        children: <Widget>[
          RaisedButton(
            child: Text('hello'),
            onPressed: () async{
              int type = await _showLoadingDialog(context);
            },
          )
        ],
      ),
    );
  }
}

日期组件

class HomeContent extends StatelessWidget{
  Future<DateTime> _showDatePicker(context) {
    var date = DateTime.now();
    return showDatePicker(
      context: context, 
      initialDate: date, 
      firstDate: date,
      lastDate: date.add(
        Duration(days: 30)
      )
    );
  }
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child: Column(
        children: <Widget>[
          RaisedButton(
            child: Text('date'),
            onPressed: () async{
              await _showDatePicker(context);
            },
          )
        ],
      ),
    );
  }
}

自定义组件

lass GradientButton extends StatelessWidget{
  GradientButton({
    this.colors,
    this.width,
    this.height,
    this.onPressed,
    this.borderRadius,
    @required this.child
  });
  final List<Color> colors;
  final double width;
  final double height;
  final Widget child;
  final BorderRadius borderRadius;
  final GestureTapCallback onPressed;
  @override
  Widget build(BuildContext context) {
    ThemeData theme = Theme.of(context);
    List<Color> _colors = colors ?? [theme.primaryColor,theme.primaryColorDark ?? theme.primaryColor]; 
    // TODO: implement build
    return DecoratedBox(
      decoration: BoxDecoration(
        gradient: LinearGradient(colors: _colors),
        borderRadius: borderRadius,
      ),
      child: Material(
        type: MaterialType.transparency,
        child: InkWell(
          splashColor: _colors.last,
          highlightColor: Colors.transparent,
          borderRadius: borderRadius,
          onTap: onPressed,
          child: ConstrainedBox(
            constraints: BoxConstraints.tightFor(height:height,width: width),
            child: Center(
              child: Padding(
                padding: EdgeInsets.all(8.0),
                child: DefaultTextStyle(
                  style: TextStyle(fontWeight: FontWeight.bold),
                  child: child,
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }
}

底部组件

import 'package:flutter/material.dart';

class BottomBarPage extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('晓智商城'),
        ),
        body: HomeContent(),
        bottomNavigationBar: BottomNavigationBar(
          type: BottomNavigationBarType.fixed,
          items: [
            BottomNavigationBarItem(
              icon: Icon(Icons.home),
              title: Text('首页'),
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.category),
              title: Text('分类')
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.search),
              title: Text('搜索')
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.person),
              title: Text('我的')
            )
          ]
        ),
      ),
      theme: ThemeData(
        primarySwatch: Colors.pink
      ),
    );
  }
}

保持页面状态1

import 'dart:ui';

import 'package:flutter/material.dart';

class NavigatorPage  extends StatefulWidget{
  _NavigatorPage createState() =>_NavigatorPage();
}

class _NavigatorPage extends State<NavigatorPage> with SingleTickerProviderStateMixin{
  TabController _controller;
  @override
  void initState() { 
    super.initState();
    _controller = TabController(length: 3,vsync: this);
  }
  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      appBar: AppBar(
        title: Text('hello'),
        bottom: TabBar(
          controller: _controller,
          tabs: [
            Tab(icon: Icon(Icons.directions_car)),
            Tab(icon: Icon(Icons.directions_transit)),
            Tab(icon: Icon(Icons.directions_bike)),
          ],
        ),
      ),
      body: TabBarView(
        controller: _controller,
        children: <Widget>[
          Text('1'),
          Text('2'),
          Text('3'),
        ],
      ),
    );
  }
}

保持页面状态2

import 'package:flutter/material.dart';

class IncreatePage extends StatefulWidget{
  _IncreatePage createState() => _IncreatePage();
}

class _IncreatePage extends State<IncreatePage> with AutomaticKeepAliveClientMixin {
  int _counter = 0;
  @override
  bool get wantKeepAlive => true;

  void _incrementCounter() {
    setState((){
      _counter++;
    });
  }
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text('点一资增中一个数字'),
            Text(
              '${_counter}',
              style: Theme.of(context).textTheme.display1,
            )
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'increment',
        child: Icon(Icons.add),
      ),
    );
  }
}

search

import 'package:flutter/material.dart';
import './asset.dart';


class SearchPage extends StatefulWidget{
  _SearchPage createState() => _SearchPage();
}

class _SearchPage extends State<SearchPage>{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      appBar: AppBar(
        title: Text('search'),
        actions: <Widget>[
          IconButton(
            icon: Icon(Icons.search),
            onPressed: () {
              print('search');
            },
          ),
        ],
      ),
    );
  }
}

tooltip

class _ToolTipPage extends State<ToolTipPage> {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      appBar: AppBar(
        title: Text('toolTip'),
      ),
      body: Center(
        child: Tooltip(
          message: '请别点击我',
          child: Image.network('http://tugua.oss-cn-hangzhou.aliyuncs.com/1600737225621499.jpeg'),
        ),
      ),
    );
  }
}

weap布局

import 'package:flutter/material.dart';




class WrapPage extends StatefulWidget{
  _WrapPage createState() => _WrapPage();
}

class _WrapPage extends State<WrapPage> {
  @override
  List<Widget> list;
  @override
  void initState() { 
    super.initState();
    list = List<Widget>()..add(buildAddButton());
  }
  Widget buildAddButton() {
     return GestureDetector(
       onTap: () {
         if(list.length <9) {
            setState(() {
                list.insert(list.length, buildPhoto());
            });
         }
       },
       child: Padding(
         padding: EdgeInsets.all(8),
         child: Container(
           width: 80,
           height: 80,
           color: Colors.grey,
           child: Icon(Icons.add),
         ),
       ),
     );
  }

  Widget buildPhoto() {
    return Padding(
      padding: EdgeInsets.all(8),
      child: Container(
        width: 80,
        height: 80,
        color: Colors.pink,
        child: Center(
          child: Text('hello'),
        )
      ),
    );
  }
  
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('wrap'),
      ),
      body: Center(
        child: Opacity(
          opacity: 0.8,
          child: Container(
            width: MediaQuery.of(context).size.width,
            height: MediaQuery.of(context).size.height / 2,
            color: Colors.green,
            child: Wrap(
              children: list,
              spacing: 26.0,
            ),
          )
        ),
      ),
    );
  }
}

拖拽功能

import 'package:flutter/material.dart';


class DraggablePage extends StatefulWidget{
  final Offset offset;
  final Color color;
  DraggablePage({Key key,this.offset,this.color}):super(key:key);
  _DraggablePage createState() => _DraggablePage();
}

class _DraggablePage extends State<DraggablePage>{
  Color _dragrcolor = Colors.green;
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
   return Scaffold(
    appBar: AppBar(
      title: Text('拖拽'),
    ),
    body: Stack(
      children: <Widget>[
        DraggableComp(
          offset: Offset(80,80),
          color: Colors.pink,
        ),
        DraggableComp(
          offset: Offset(180,80),
          color: Colors.red,
        ),
        Center(
          child: DragTarget(
            onAccept: (Color color) {
              _dragrcolor = color;
            },
            builder: (context,candidateDate,rejectedData) {
              return Container(
                width: 200,
                height: 200,
                color: _dragrcolor,
              );
            },
          ),
        )
      ],
    ),
   );
  }
}



class DraggableComp extends StatefulWidget{
  final Offset offset;
  final Color color;
  DraggableComp({Key key,this.offset,this.color}):super(key:key);
  _DraggableComp createState() => _DraggableComp();
}

class _DraggableComp extends State<DraggableComp>{
  Offset offset = Offset(0,0);
  @override
  void initState() { 
    super.initState();
    offset = widget.offset;

  }
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Positioned(
      left: offset.dx,
      top: offset.dy,
      child: Draggable(
        data: widget.color,
        child: Container(
          width: 100,
          height: 100,
          color: widget.color,
        ), 
        feedback: Container(
          width: 100,
          height: 100,
          color: widget.color.withOpacity(0.5),
        ),
        onDraggableCanceled: (Velocity velocity,Offset offset){
          setState(() {
            this.offset = offset;
          });
        },
      ),
    );
  }
}

 曲线

class ClipPage extends StatefulWidget{
  _ClipPage createState() =>_ClipPage();
  // @override
  // Widget build(BuildContext context) {
  //   return Sc;
  // }
}

class _ClipPage extends State<ClipPage>{
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('clip'),
      ),
      body:Column(
        children: <Widget>[
          ClipPath(
            clipper: ClipWeight(),
            child: Container(
              color: Colors.pink,
              height: 200,
            ),
          )
        ],
      )
    );
  }
}

class ClipWeight extends CustomClipper<Path>{
  @override
  Path getClip(Size size) {
    // TODO: implement getClip
    var path = Path();
    path.lineTo(0, 0);
    path.lineTo(0, size.height - 50);
    var firstControlPoint = Offset(size.width / 2,size.height);
    var firstEndPoint = Offset(size.width,size.height - 50);

    path.quadraticBezierTo(
      firstControlPoint.dx,
      firstControlPoint.dy, 
      firstEndPoint.dx,
       firstEndPoint.dy
    );

    path.lineTo(size.width, size.height - 50);
    path.lineTo(size.width, 0);
    return path;
  }
  @override
  bool shouldReclip(CustomClipper<Path> oldClipper) {
    // TODO: implement shouldReclip
    return false;
  }
}

点击事件

class  HomeContent extends StatefulWidget{
  _HomeContent createState() => _HomeContent();
}

class _HomeContent extends State<HomeContent>{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Stack(
      children: <Widget>[
        Listener(
          child: ConstrainedBox(
            constraints: BoxConstraints.tight(Size(300,200)),
            child: DecoratedBox(
              decoration: BoxDecoration(color: Colors.blue),
            )
          ),
          onPointerDown: (event) => print('donw0'),
        ),
        Listener(
          child: ConstrainedBox(
            constraints: BoxConstraints.tight(Size(200,100)),
            child: Center(
              child: Text('左上解200*100范围被点透'),
            ),
          ),
          onPointerDown: (event) => print('down1'),
          behavior: HitTestBehavior.translucent,
        )
      ],
    );
  }
}

事件系统

import 'dart:ui';

import 'package:flutter/material.dart';
 

 class EventPage extends StatefulWidget{
   _EventPage createState() =>_EventPage();
 }

 class _EventPage extends State<EventPage>{
   String _operation = 'noevent';
   void updateText(String text) {
     setState(() {
       _operation = text;
     });
   }
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
         title: Text('event'),
       ),
       body:  Center(
       child: GestureDetector(
         child: Container(
           alignment: Alignment.center,
           color: Colors.blue,
           width: 100,
           height: 100,
           child: Text(_operation,style: TextStyle(color: Colors.pink)),
         ),
         onTap: () => updateText('onTap'),
         onDoubleTap: () => updateText('onDoubleTap'),
         onLongPress: () => updateText('onLongPress'),
       ),
     ),
     );

拖拽

import 'package:flutter/material.dart';


class DragEventPage extends StatefulWidget{
_DragEventPage createState() => _DragEventPage();
}

class _DragEventPage extends State<DragEventPage> with SingleTickerProviderStateMixin{
double _top = 0.0;
double _left = 0.0;

@override
Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(
      title: Text('eventDrag'),
    ),
    body: Stack(
      children: <Widget>[
        Positioned(
          top: _top,
          left: _left,
          child: GestureDetector(
            child: CircleAvatar(
              child: Text('A'),
            ),
            onPanDown:(DragDownDetails e) {
              print('${e.globalPosition}');
            },
            onPanUpdate: (DragUpdateDetails e) {
              setState(() {
                _left += e.delta.dx;
                _top += e.delta.dy;
              });
            },
            onPanEnd: (DragEndDetails e) {
              print(e.velocity);
            },
          ),
        )
      ],
    ),
  );
}
}

切换颜色

import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
 
class RecognizerPage extends StatefulWidget{
  _RecognizerPage createState() => _RecognizerPage();
}

class _RecognizerPage extends State<RecognizerPage>{
  TapGestureRecognizer _tapGestureRecognizer = new TapGestureRecognizer();
  bool _toggle = false;
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      appBar: AppBar(
        title: Text('more event'),
      ),
      body: Center(
        child: Text.rich(
          TextSpan(
            children:[
              TextSpan(text: '你好世界'),
              TextSpan(
                text: '点我变色',
                style: TextStyle(
                  fontSize: 30,
                  color: _toggle ? Colors.red:Colors.blue
                ),
                recognizer: _tapGestureRecognizer
                ..onTap = () {
                  setState(() {
                    _toggle = !_toggle;
                  });
                }
              ),
              TextSpan(text: '你好世界')
            ] 
          )
        ),
      )
    );
  }
}

单个商品

class ProductItem extends StatefulWidget{
  _ProductItem createState() =>_ProductItem();
}

class _ProductItem extends State<ProductItem>{
  
  @override
  Widget build(BuildContext context) {
    ScreenAdapter.init(context);
    return Container(
      width: (ScreenAdapter.screenWidth() - ScreenAdapter.height(60)) / 2,
      padding: EdgeInsets.all(ScreenAdapter.height(10)),
      decoration: BoxDecoration(
        border: Border.all(
          color:Color.fromRGBO(233, 233, 233, 0.9),
          width:ScreenAdapter.width(1),
        ),
        color: Colors.white
      ),
      child: Column(
        children: <Widget>[
          Container(
            width: double.infinity,
            // height: ScreenAdapter.height(360),
            child: AspectRatio(
              aspectRatio: 1/1,
              child:Image.network(
              'http://tugua.oss-cn-hangzhou.aliyuncs.com/16005339644607674.jpeg',
              fit: BoxFit.cover,
              ),
            )
          ),
          Padding(
            padding: EdgeInsets.only(top:ScreenAdapter.height(10)),
            child: Text(
              '大皮衣大皮衣大皮衣大皮衣大皮衣大皮衣大皮衣大皮衣大皮衣大皮衣大皮衣大皮衣',
              maxLines: 2,
              overflow: TextOverflow.ellipsis,
              style: TextStyle(color: Colors.black54),
            ),
          ),
          Padding(
            padding: EdgeInsets.only(top:ScreenAdapter.height(10)),
            child: Stack(
              children: <Widget>[
                Align(
                  alignment: Alignment.centerLeft,
                  child: Padding(
                    padding: EdgeInsets.only(left:ScreenAdapter.width(20)),
                    child: Text(
                      '￥1111',
                      style: TextStyle(
                        color: Colors.red,
                        fontSize: 16,
                      ),
                    ),
                  )
                ),
                Align(
                  alignment: Alignment.centerRight,
                  child: Padding(
                    padding: EdgeInsets.only(right:ScreenAdapter.width(20)),
                    child: Text(
                      '￥1888',
                      style: TextStyle(
                        color: Colors.black54,
                        decoration: TextDecoration.lineThrough
                      ),
                    ),
                  ),
                  // child: Text('187'),
                )
              ],
            ),
          )
        ],
      ),
    );
  }
}

flutter设置背图片

做移动开始的朋友都知道项目中很多时候要用到用图片做背景，当然flutter也可以设置背景图片。 具体代码如下

class BackgroundImgDemo extends StatelessWidget {
  const BackgroundImgDemo({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      decoration: BoxDecoration(
        image: new DecorationImage(
          fit: BoxFit.cover,
          image: new NetworkImage(
              'https://randomuser.me/api/portraits/men/43.jpg'),
        ),
      ),
      child: Container(
        color: Colors.red.withOpacity(.5),
        child: Center(
          child: Text(
            "我在图片的上面哦~",
            style: TextStyle(color: Colors.white, fontSize: 33),
          ),
        ),
      ),
    );
  }
}

事件系统

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget{
  MyApp({Key key}):super(key:key);
  _MyApp createState() => _MyApp();
}

class _MyApp extends State<MyApp>{
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primaryColor: Colors.blue
      ),
      home: HomeContent(),
    );
  }
}
 class HomeContent extends StatefulWidget {
  HomeContent({Key key}) : super(key: key);

  @override
  _HomeContent createState() => _HomeContent();
}

class _HomeContent extends State<HomeContent> {
  PointerEvent _event;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('首页'),
      ),
      body: Listener(
        child: Container(
          alignment: Alignment.center,
          color: Colors.pink,
          width: 300,
          height: 150,
          child: Text(this._event?.toString() ?? "",style: TextStyle(color: Colors.white)),
        ),
        onPointerDown: (PointerDownEvent event) => setState(() => _event = event),
        onPointerMove: (PointerMoveEvent event) => setState(() => _event = event),
        onPointerUp: (PointerUpEvent event) => setState(() => _event = event),
      ),
    );
  }
}

事件的传递

class _HomeContent extends State<HomeContent>{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    // throw UnimplementedError();
    return Listener(
      child: AbsorbPointer(
        child: Listener(
          child: Container(
            color: Colors.red,
            width: 200,
            height: 100,
          ),
          onPointerDown: (event) => print('in'),
        ),
      ),
      onPointerDown: (event) => print('up'),
    );
  }
}

移动事件组件 

class _HomeContent extends State<HomeContent>{
  double _top = 0;
  double _left = 0;
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      appBar: AppBar(
        title: Text('首页'),
      ),
      body: Stack(
      children: <Widget>[
        Positioned(
          top: _top,
          left: _left,
          child: GestureDetector(
            child: CircleAvatar(child: Text('A')),
            onPanDown: (DragDownDetails e){
              print("用户按下：${e.globalPosition}");
            },
            onPanUpdate: (DragUpdateDetails e) {
              setState(() {
                _left += e.delta.dx;
                _top += e.delta.dy;
              });
            },
            onPanEnd: (DragEndDetails e) {
              print(e.velocity);
            },
          )
        )
      ],
    ),
    );
  }
}

事件单向移动

class _HomeContent extends State<HomeContent>{
  double _top = 0;
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    // throw UnimplementedError();
    return Scaffold(
      appBar: AppBar(
        title: Text('首页'),
      ),
      body: Stack(
        children: <Widget>[
          Positioned(
            top: _top,

            child: GestureDetector(
              child: CircleAvatar(child: Text('A')),
              onVerticalDragUpdate: (DragUpdateDetails e) {
                setState(() {
                  _top += e.delta.dy;
                });
              },
            )
          )
        ],
      ),
    );
  }
}

缩放

class _HomeContent extends State<HomeContent>{
  double _width = 200;
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      appBar: AppBar(
        title: Text('首页'),
      ),
      body: Center(
      child: GestureDetector(
        child: Image.network('http://tugua.oss-cn-hangzhou.aliyuncs.com/16006152126699263.jpeg',width: _width),
        onScaleUpdate: (ScaleUpdateDetails e) {
          setState(() {
            _width = 200 * e.scale.clamp(0.8, 10);
          });
        },
      ),
    ),
    );
  }
}

文本操作

class _HomeContent extends State<HomeContent>{
  TapGestureRecognizer _tapGestureRecognizer = new TapGestureRecognizer();
  bool _toggle = false; //变色开关
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    // throw UnimplementedError();
    return Scaffold(
      appBar: AppBar(
        title: Text('首页'),
      ),
      body: Center(
        child: Text.rich(TextSpan(
          children: [
            TextSpan(text: '你好世界'),
            TextSpan(text: '点我变色',style: TextStyle(
              fontSize: 30,
              color: _toggle ? Colors.blue:Colors.red
            ),
            recognizer: _tapGestureRecognizer
            ..onTap = () => {
              setState((){
                _toggle = !_toggle;
              })
            }
            ),
            TextSpan(text: '你好世界')
          ]
        )),
      ),
    );
}
}

事件总结程

class _HomeContent extends State<HomeContent>{
  double _top = 0;
  double _left = 0;
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      appBar: AppBar(
        title: Text('首页'),
      ),
      body: Stack(
        children: <Widget>[
          Positioned(
            left: _left,
            child: GestureDetector(
              child: CircleAvatar(child: Text('A')),
              onHorizontalDragUpdate: (DragUpdateDetails e) {
                setState(() {
                  _left += e.delta.dx;
                });
              },
              onHorizontalDragEnd: (details) {
                print('onHorizontalDragEnd');
              },
              onTapDown: (details) {
                print('details');
              },
            )
          )
        ],
      ),
    );
  }
}

通知

class _HomeContent extends State<HomeContent>{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      appBar: AppBar(
        title: Text('首页'),
      ),
      body: NotificationListener(
        onNotification: (notification) {
           switch(notification.runtimeType) {
             case ScrollSpringSimulation: print("开始滚动");break;
             case ScrollUpdateNotification: print('正在滚动');break;
             case ScrollUpdateNotification: print('滚动停止');break;
             case OverscrollNotification: print('滚动到边界');break;
           }
        },
        child:  ListView.builder(
        itemCount: 100,
        itemBuilder: (context,index) {
          return ListTile(title:Text('${index}'));
        },
      ),
      ),
    );
  }
}

基础动画

class _HomeContent extends State<HomeContent> with SingleTickerProviderStateMixin {
 Animation<double> animation;
  AnimationController controller;

  initState() {
    super.initState();
    controller = new AnimationController(
        duration: const Duration(seconds: 3), vsync: this);
    //图片宽高从0变到300
    animation = new Tween(begin: 0.0, end: 300.0).animate(controller)
      ..addListener(() {
        setState(()=>{});
      });
    //启动动画(正向执行)
    controller.forward();
  }

  @override
  Widget build(BuildContext context) {
    return new Center(
       child: Image.asset("images/avator.png",
          width: animation.value,
          height: animation.value
      ),
    );
  }

  dispose() {
    //路由销毁时需要释放动画资源
    controller.dispose();
    super.dispose();
  }
}

动画旋转

/*
 * @Author: dezhizhang
 * @Date: 2020-10-24 15:07:50
 * @LastEditTime: 2020-12-13 20:04:51
 * @LastEditors: Please set LastEditors
 * @Description: In User Settings Edit
 * @FilePath: /xiaozhi/lib/main.dart
 */

import 'package:flutter/material.dart';


void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home:HomeContent(),
    );
  }
}

class HomeContent extends StatelessWidget{
  double _turns = 0;
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
   return Scaffold(
     appBar: AppBar(
       title: Text('首页'),
     ),
     body: Content()
   );
  }
}

class Content extends StatefulWidget{
  _Content createState() => _Content();
}

class _Content extends State<Content>{
  double _turns = 0;
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child: Column(
        children: <Widget>[
          TurnBox(
            turns: _turns,
            speed: 500,
            child: Icon(Icons.refresh,size: 50),
          ),
          TurnBox(
            turns: _turns,
            speed: 1000,
            child: Icon(Icons.refresh,size: 150),
          ),
          RaisedButton(
            child: Text('顺时什'),
            onPressed: () {
             setState(() {
               _turns+= 0.2;
             });
            }
          )
        ],
      ),
    );
  }
}

class TurnBox extends StatefulWidget{
  final double turns;
  final int speed;
  final Widget child;
  TurnBox({Key key,this.turns = .0,this.speed = 200, this.child}):super(key: key);
  _TurnBox createState() => _TurnBox();
}

class _TurnBox extends State<TurnBox> with SingleTickerProviderStateMixin{
  AnimationController _controller;
  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    _controller = new AnimationController(
      vsync: this,
      lowerBound:  -double.infinity,
      upperBound: double.infinity
    );
    _controller.value = widget.turns;
  }
  @override
  void dispose() {
    // TODO: implement dispose
    super.dispose();
    _controller.dispose();
  }
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return RotationTransition(
      turns: _controller,
      child: widget.child,
    );
  }
  @override
  void didUpdateWidget(TurnBox oldWidget) {
    // TODO: implement didUpdateWidget
    super.didUpdateWidget(oldWidget);
    if(oldWidget.turns != widget.turns) {
      _controller.animateTo(
        widget.turns,
        duration: Duration(milliseconds: widget.speed??200),
        curve: Curves.easeOut,
      );
    }
  }
}

子组件与父组件数据回调

import 'package:flutter/material.dart';
import '../../utils/utils.dart';

class ProductTabBar extends StatefulWidget {
  int index;
  String title;
  int activeIndex;
  final ValueChanged<int> changeColorCallBack;
  ProductTabBar({Key key,this.title,this.index,this.activeIndex,this.changeColorCallBack}):super(key: key);
  _ProductTabBar createState() => _ProductTabBar(this.title,this.index,this.activeIndex,this.changeColorCallBack);
}

class _ProductTabBar extends State<ProductTabBar> {
  int index;
  String title;
  int activeIndex;
  final ValueChanged<int> changeColorCallBack;
  _ProductTabBar(this.title,this.index,this.activeIndex,this.changeColorCallBack);
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Expanded(
      flex: 1,
      child:InkWell(
        onTap: () {
          changeColorCallBack(index);
        },
        child: Container(
        decoration: BoxDecoration(
          border: Border(
            bottom: BorderSide(
              width: 1,
              color: this.activeIndex == this.index ? Colors.pink:Colors.white
            )
          )
        ),
        alignment: Alignment.center,
        height: ScreenAdapter.height(80),
        child: Text(this.title)
        ),
      ),
    );
  }
}

import 'dart:ui';

import 'package:flutter/material.dart';
import './productItem.dart';
import './productTabBar.dart';
import '../../utils/utils.dart';
class Product extends StatefulWidget{
  Map arguments;
  Product({Key key,this.arguments}):super(key:key);
  _Product createState() => _Product();
}

class _Product extends State<Product>{
  @override
  Widget build(BuildContext context) {
    ScreenAdapter.init(context);
    return Scaffold(
      appBar: AppBar(
        title: Text('商品列表'),
      ),
      body:HomeContent(),
    );
  }
}

class HomeContent extends StatefulWidget{
  _HomeContent createState() => _HomeContent();
}

class _HomeContent extends State<HomeContent>{
  List<Map> list = [
    {"title":"综合","index":0},
    {"title": "销量","index":1},
    {"title":"价格","index":2},
    {"title":"筛选","index":3},
  ];
  int activeIndex = 0;
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Stack(
      children: <Widget>[
        Container(
          padding: EdgeInsets.all(ScreenAdapter.width(10)),
          margin: EdgeInsets.only(top:ScreenAdapter.height(80)),
          child: ListView.builder(
            itemCount: 10,
            itemBuilder: (context,index){
              return ProductItem();
            },
          ),
        ),
        Positioned(
          width: ScreenAdapter.width(750),
          height: ScreenAdapter.height(80),
          child: Container(
            color:Colors.white,
            child:Flex(
              direction: Axis.horizontal,
              children: this.list.map((item) => 
                ProductTabBar(
                  title:item['title'],
                  activeIndex:activeIndex,
                  index:item["index"],
                  changeColorCallBack:(index){
                    print(index);
                    setState((){
                      this.activeIndex = index;
                    });
                  }
                )
              ).toList(),
            ),
          ),
        ),
      ],
    );
  }
}

实现图片上传

import 'dart:io';
import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';


class Advice extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('投诉建议'),
      ),
      body: HomeContent(),
    );
  }
}


class  HomeContent extends StatefulWidget {
  _HomeContent createState() => _HomeContent();
}

class _HomeContent extends State<HomeContent>  {
  File _image;
  final picker = ImagePicker();
  handleTaking() async{
    final pickedFile = await picker.getImage(source: ImageSource.camera);
    setState(() {
      if (pickedFile != null) {
        _image = File(pickedFile.path);
      } else {
        print('No image selected.');
      }
    });
  }
  handlePhoto() async {
    final pickedFile = await picker.getImage(source: ImageSource.gallery);
    setState(() {
      if (pickedFile != null) {
        _image = File(pickedFile.path);
      } else {
        print('No image selected.');
      }
    });
  
  }
  handleSubmit() async{
    FormData formData = new FormData.fromMap({
      "name":"xiaozhi",
      "age":25,
       "file":await MultipartFile.fromFile("${this._image}", filename: "1.png"),
      // "file":new UploadFileInfo(this._image, "xxx.jpg"),
    });
    var response = await Dio().post("http://jd.itying.com/imgupload", data: formData);
    print(response);
  }
  @override
  Widget build(BuildContext context) {
    return Column(
      children: <Widget>[
        RaisedButton(
          child: Text('拍照'),
          onPressed: this.handleTaking
        ),
        SizedBox(height:10),
        RaisedButton(
          child: Text('相册选择'),
          onPressed:handlePhoto ,
        ),
        RaisedButton(
          child: Text('上传图片'),
          onPressed: handleSubmit
        )
      ],
    );
  }
}

视频播放

import 'package:flutter/material.dart';
import 'package:chewie/chewie.dart';
import 'package:video_player/video_player.dart';
import '../../utils/utils.dart';

class Video extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      appBar: AppBar(
        title: Text("视频"),
      ),
      body: Content(),
    );
  }
}

class Content extends StatefulWidget{
  _Content createState() => _Content();
}

class _Content extends State<Content>{
  @override
  ChewieController chewieController;
  VideoPlayerController videoPlayerController;
  @override
  void initState() { 
    super.initState();
    this.videoPlaye();
  }
  videoPlaye() {
    videoPlayerController = VideoPlayerController.network(
      'http://vfx.mtime.cn/Video/2019/02/04/mp4/190204084208765161.mp4'
    );
    chewieController = ChewieController(
      videoPlayerController: videoPlayerController, 
      aspectRatio: 3 / 2, 
      autoPlay: true,
      looping: true, 
    );
  }
  @override
  void dispose() {
    super.dispose();
    videoPlayerController.dispose();
    chewieController.dispose();
  }
  
  Widget build(BuildContext context) {
    ScreenAdapter.init(context);
    // TODO: implement build
    return Container(
      child: Chewie(
        controller: chewieController,
      ),
    );
  }
}

获取网络状态

import 'package:flutter/material.dart';
import 'package:connectivity/connectivity.dart';


class Network extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      appBar: AppBar(
        title: Text('网络请求'),
      ),
      body: Content(),
    );
  }
}

class Content extends StatefulWidget{
  _Content createState() => _Content();
}

class _Content extends State<Content>{
  var subscription;
  var netWorkText="没有网络";
  @override
  void initState() { 
    super.initState();
    this.getNetWork();
  }
  @override
  dispose() {
    super.dispose();
    subscription.cancel();
  }
  getNetWork() {
    subscription = Connectivity().onConnectivityChanged.listen((ConnectivityResult result) {
      print('++++');
      print(result);
      print('++++');
      if(result==ConnectivityResult.wifi) {
        setState(() {
          this.netWorkText = "wifi";
        });
      }else if(result == ConnectivityResult.mobile) {
        setState(() {
          this.netWorkText = "mobile";
        });
      }else {
        setState(() {
          this.netWorkText = '没有网络';
        });
      }
    // Got a new connectivity status!
    });
  }
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Text('${this.netWorkText}');
  }
}

获取网络状态

打开外部应用

import 'package:flutter/material.dart';
import 'package:url_launcher/url_launcher.dart';

class WebView extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      appBar: AppBar(
        title: Text('打开外部应用'),
      ),
      body: Content(),
    );
  }
}

class Content extends StatefulWidget{
  _Content createState() => _Content();
}

class _Content extends State<Content>{
  //打开外部应用
  handleWeb() async{
    const url = 'http://www.xiaozhi.shop';
    if(await canLaunch(url)) {
      await launch(url);
    } else {
      throw 'Could not launch $url';
    }
  }
  //拨打电话
  handlePhone() async{
    const tel = "tel:15083356190";
    if(await canLaunch(tel)) {
      await launch(tel);
    }else {
      throw 'Could not lunch $tel';
    }
  }
  //发送短信
  handleSms() async {
    const sms = "sms:15083356190";
    if(await canLaunch(sms)) {
      await launch(sms);
    } else {
      throw 'can not lunch $sms';
    }
  }
  //打开外部应用
  handleSystem() async{
    const sys = "weixin://";
     if(await canLaunch(sys)) {
      await launch(sys);
    } else {
      throw 'can not lunch $sys';
    }
  }
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child:Column(
      children: <Widget>[
        RaisedButton(
          child: Text('打开外部浏览器'),
          onPressed: handleWeb
        ),
        RaisedButton(
          child: Text('打电话'),
          onPressed: handlePhone
        ),
        RaisedButton(
          
          child: Text('发短信'),
          onPressed: handleSms
        ),
        RaisedButton(
          child: Text('打开外部应用'),
          onPressed: handleSystem
        )
      ],
      ),
    );
    
    
  }
}

外部应用模块