flutter3-dylive仿抖音App实例|Flutter3+Getx实战短视频直播应用

原创研发flutter3+getX+mediaKit跨平台仿抖音app短视频直播实战Flutter3-DouYin。

flutter3_dylive使用最新跨平台技术flutter3.x+dart3+getx+get_storage+media_kit开发手机端仿抖音app小视频直播实战项目。实现了抖音全屏式上下滑动视频、左右滑动切换页面模块，直播间进场/礼物动画，聊天等模块。

技术栈

编辑器：Vscode
技术框架：Flutter3.19.2+Dart3.3.0
路由/状态管理：get: ^4.6.6
本地缓存：get_storage: ^2.1.1
图片预览插件：photo_view: ^0.14.0
刷新加载：easy_refresh^3.3.4
toast轻提示：toast^0.3.0
视频套件：media_kit: ^1.1.10+1

flutter_douyin实现了类似抖音全屏沉浸式滑动效果(上下滑动视频、左右切换页面模块)。

如下图：实现了左右滑动的同时，顶部状态栏+Tab菜单+底部bottomNavigationBar导航栏三者联动效果。

项目结构目录

在项目创建前期，需要配置好Flutter SDK和Dart SDK开发环境。

https://flutter.dev/

https://www.dartcn.com/

https://pub.flutter-io.cn/

如果是使用Vscode编辑器开发flutter项目，大家需自行配置flutter/dart扩展语法插件。

项目中的一些技术知识点，有些是在之前的项目flutter3聊天实例中有介绍过，感兴趣的话可以去看看。

https://www.cnblogs.com/xiaoyan2017/p/18008370

https://www.cnblogs.com/xiaoyan2017/p/18048244

Flutter入口配置main.dart

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:get_storage/get_storage.dart';
import 'package:media_kit/media_kit.dart';

import 'utils/index.dart';

// 引入布局模板
import 'layouts/index.dart';

import 'binding/binding.dart';

// 引入路由管理
import 'router/index.dart';

void main() async {
  // 初始化get_storage
  await GetStorage.init();

  // 初始化media_kit
  WidgetsFlutterBinding.ensureInitialized();
  MediaKit.ensureInitialized();

  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return GetMaterialApp(
      title: 'FLUTTER3 DYLIVE',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: const Color(0xFFFE2C55)),
        useMaterial3: true,
        // 修正windows端字体粗细不一致
        fontFamily: Platform.isWindows ? 'Microsoft YaHei' : null,
      ),
      home: const Layout(),
      // 全局绑定GetXController
      initialBinding: GlobalBindingController(),
      // 初始路由
      initialRoute: Utils.isLogin() ? '/' : '/login',
      // 路由页面
      getPages: routePages,
      // 错误路由
      // unknownRoute: GetPage(name: '/404', page: Error),
    );
  }
}

Flutter3底部导航栏

底部导航栏使用 bottomNavigationBar 组件实现页面模块切换。通过getx全局状态来联动控制底部导航栏背景颜色。

导航栏中间图标/图片按钮，使用了 Positioned 组件定位实现功能。

return Scaffold(
  backgroundColor: Colors.grey[50],
  body: pageList[pageCurrent],
  // 底部导航栏
  bottomNavigationBar: Theme(
    // Flutter去掉BottomNavigationBar底部导航栏的水波纹
    data: ThemeData(
      splashColor: Colors.transparent,
      highlightColor: Colors.transparent,
      hoverColor: Colors.transparent,
    ),
    child: Obx(() {
      return Stack(
        children: [
          Container(
            decoration: const BoxDecoration(
              border: Border(top: BorderSide(color: Colors.black54, width: .1)),
            ),
            child: BottomNavigationBar(
              backgroundColor: bottomNavigationBgcolor(),
              fixedColor: FStyle.primaryColor,
              unselectedItemColor: bottomNavigationItemcolor(),
              type: BottomNavigationBarType.fixed,
              elevation: 1.0,
              unselectedFontSize: 12.0,
              selectedFontSize: 12.0,
              currentIndex: pageCurrent,
              items: [
                ...pageItems
              ],
              onTap: (index) {
                setState(() {
                  pageCurrent = index;
                });
              },
            ),
          ),
          // 自定义底部导航栏中间按钮
          Positioned(
            left: MediaQuery.of(context).size.width / 2 - 15,
            top: 0,
            bottom: 0,
            child: InkWell(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  // Icon(Icons.tiktok, color: bottomNavigationItemcolor(centerDocked: true), size: 32.0,),
                  Image.asset('assets/images/applogo.png', width: 32.0, fit: BoxFit.contain,)
                  // Text('直播', style: TextStyle(color: bottomNavigationItemcolor(centerDocked: true), fontSize: 12.0),)
                ],
              ),
              onTap: () {
                setState(() {
                  pageCurrent = 2;
                });
              },
            ),
          ),
        ],
      );
    }),
  ),
);

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

import '../styles/index.dart';
import '../../controllers/page_video_controller.dart';

// 引入pages页面
import '../pages/index/index.dart';
import '../pages/video/index.dart';
import '../pages/live/index.dart';
import '../pages/message/index.dart';
import '../pages/my/index.dart';

class Layout extends StatefulWidget {
  const Layout({super.key});

  @override
  State<Layout> createState() => _LayoutState();
}

class _LayoutState extends State<Layout> {
  PageVideoController pageVideoController = Get.put(PageVideoController());

  // page索引
  int pageCurrent = 0;
  // page页面
  List pageList = [const Index(), const FVideo(), const FLiveList(), const Message(), const My()];
  // tabs选项
  List pageItems = [
    const BottomNavigationBarItem(
      icon: Icon(Icons.home_outlined),
      label: '首页'
    ),
    const BottomNavigationBarItem(
      icon: Icon(Icons.play_arrow_outlined),
      label: '短视频'
    ),
    const BottomNavigationBarItem(
      icon: Icon(Icons.live_tv_rounded, color: Colors.transparent,),
      label: ''
    ),
    BottomNavigationBarItem(
      icon: Stack(
        alignment: const Alignment(4, -2),
        children: [
          const Icon(Icons.messenger_outline),
          FStyle.badge(1)
        ],
      ),
      label: '消息'
    ),
    BottomNavigationBarItem(
      icon: Stack(
        alignment: const Alignment(1.5, -1),
        children: [
          const Icon(Icons.person_outline),
          FStyle.badge(0, isdot: true)
        ],
      ),
      label: '我'
    )
  ];

  // 底部导航栏背景色
  Color bottomNavigationBgcolor() {
    int index = pageCurrent;
    int pageVideoTabIndex = pageVideoController.pageVideoTabIndex.value;
    Color color = Colors.white;
    if(index == 1) {
      if([1, 2, 3].contains(pageVideoTabIndex)) {
        color = Colors.white;
      }else {
        color = Colors.black;
      }
    }
    return color;
  }
  // 底部导航栏颜色
  Color bottomNavigationItemcolor({centerDocked = false}) {
    int index = pageCurrent;
    int pageVideoTabIndex = pageVideoController.pageVideoTabIndex.value;
    Color color = Colors.black54;
    if(index == 1) {
      if([1, 2, 3].contains(pageVideoTabIndex)) {
        color = Colors.black54;
      }else {
        color = Colors.white60;
      }
    }else if(index == 2 && centerDocked) {
      color = FStyle.primaryColor;
    }
    return color;
  }

  // ...
}

Flutter实现抖音全屏式滑动

如下图：实现类似抖音左右滑动全屏切换页面模块、上下滑动丝滑切换短视频。

采用 TabBar 和 PageView 联动页面滑动。

return Scaffold(
  extendBodyBehindAppBar: true,
  appBar: AppBar(
    forceMaterialTransparency: true,
    backgroundColor: [1, 2, 3].contains(pageVideoController.pageVideoTabIndex.value) ? null : Colors.transparent,
    foregroundColor: [1, 2, 3].contains(pageVideoController.pageVideoTabIndex.value) ? Colors.black : Colors.white,
    titleSpacing: 1.0,
    leading: Obx(() => IconButton(icon: Icon(Icons.menu, color: tabColor(),), onPressed: () {},),),
    title: Obx(() {
      return TabBar(
        controller: tabController,
        tabs: pageTabs.map((v) => Tab(text: v)).toList(),
        isScrollable: true,
        tabAlignment: TabAlignment.center,
        overlayColor: MaterialStateProperty.all(Colors.transparent),
        unselectedLabelColor: unselectedTabColor(),
        labelColor: tabColor(),
        indicatorColor: tabColor(),
        indicatorSize: TabBarIndicatorSize.label,
        unselectedLabelStyle: const TextStyle(fontSize: 16.0, fontFamily: 'Microsoft YaHei'),
        labelStyle: const TextStyle(fontSize: 16.0, fontFamily: 'Microsoft YaHei', fontWeight: FontWeight.w600),
        dividerHeight: 0,
        labelPadding: const EdgeInsets.symmetric(horizontal: 10.0),
        indicatorPadding: const EdgeInsets.symmetric(horizontal: 5.0),
        onTap: (index) {
          pageVideoController.updatePageVideoTabIndex(index); // 更新索引
          pageController.jumpToPage(index);
        },
      );
    }),
    actions: [
      Obx(() => IconButton(icon: Icon(Icons.search, color: tabColor(),), onPressed: () {},),),
    ],
  ),
  body: Column(
    children: [
      Expanded(
        child: Stack(
          children: [
            /// 水平滚动模块
            PageView(
              // 自定义滚动行为(支持桌面端滑动、去掉滚动条槽)
              scrollBehavior: PageScrollBehavior().copyWith(scrollbars: false),
              scrollDirection: Axis.horizontal,
              controller: pageController,
              onPageChanged: (index) {
                pageVideoController.updatePageVideoTabIndex(index); // 更新索引
                setState(() {
                  tabController.animateTo(index);
                });
              },
              children: [
                ...pageModules
              ],
            ),
          ],
        ),
      ),
    ],
  ),
);

PageVideoController pageVideoController = Get.put(PageVideoController());

List<String> pageTabs = ['热点', '长视频', '文旅', '商城', '关注', '同城服务', '推荐'];
final pageModules = [
  const HotModule(),
  const LongVideoModule(),
  const TripModule(),
  const MallModule(),
  const FavorModule(),
  const NearModule(),
  const RecommendModule()
];
late final TabController tabController = TabController(initialIndex: pageVideoController.pageVideoTabIndex.value, length: pageTabs.length, vsync: this);
// 页面controller
late final PageController pageController = PageController(initialPage: pageVideoController.pageVideoTabIndex.value, viewportFraction: 1.0);

@override
void dispose() {
  tabController.dispose();
  pageController.dispose();
  super.dispose();
}

flutter短视频mini进度条

底部mini播放进度条一开始是采用自定义组件实现效果，不过不能拖动滚动条进度，后来就采用了Slider组件来实现。

// flutter滑动短视频模块  Q：282310962

return Container( color: Colors.black, child: Column( children: [ Expanded( child: Stack( children: [ /// 垂直滚动模块  PageView.builder( // 自定义滚动行为(支持桌面端滑动、去掉滚动条槽) scrollBehavior: PageScrollBehavior().copyWith(scrollbars: false), scrollDirection: Axis.vertical, controller: pageController, onPageChanged: (index) async { ... }, itemCount: videoList.length, itemBuilder: (context, index) { return Stack( children: [ // 视频区域  Positioned( top: 0, left: 0, right: 0, bottom: 0, child: GestureDetector( child: Stack( children: [ // 短视频插件  Visibility( visible: videoIndex == index, child: Video( controller: videoController, fit: BoxFit.cover, // 无控制条  controls: NoVideoControls, ), ), // 播放/暂停按钮  StreamBuilder( stream: player.stream.playing, builder: (context, playing) { return Visibility( visible: playing.data == false, child: Center( child: IconButton( padding: EdgeInsets.zero, onPressed: () { player.playOrPause(); }, icon: Icon( playing.data == true ? Icons.pause : Icons.play_arrow_rounded, color: Colors.white70, size: 70, ), ), ), ); }, ), ], ), onTap: () { player.playOrPause(); }, ), ), // 右侧操作栏  Positioned( bottom: 15.0, right: 10.0, child: Column( ... ), ), // 底部信息区域  Positioned( bottom: 15.0, left: 10.0, right: 80.0, child: Column( ... ), ), // 播放mini进度条  Positioned( bottom: 0.0, left: 10.0, right: 10.0, child: Visibility( visible: videoIndex == index && position > Duration.zero, child: Listener( child: SliderTheme( data: const SliderThemeData( trackHeight: 2.0, thumbShape: RoundSliderThumbShape(enabledThumbRadius: 4.0), // 调整滑块的大小 // trackShape: RectangularSliderTrackShape(), // 使用矩形轨道形状 overlayShape: RoundSliderOverlayShape(overlayRadius: 0), // 去掉Slider默认上下边距间隙 inactiveTrackColor: Colors.white24, // 设置非活动进度条的颜色 activeTrackColor: Colors.white, // 设置活动进度条的颜色 thumbColor: Colors.pinkAccent, // 设置滑块的颜色 overlayColor: Colors.transparent, // 设置滑块覆盖层的颜色  ), child: Slider( value: sliderValue, onChanged: (value) async { // debugPrint('当前视频播放时间$value');  setState(() { sliderValue = value; }); // 跳转播放时间 await player.seek(duration * value.clamp(0.0, 1.0)); }, onChangeEnd: (value) async { setState(() { sliderDraging = false; }); // 继续播放 if(!player.state.playing) { await player.play(); } }, ), ), onPointerMove: (e) { setState(() { sliderDraging = true; }); }, ), ), ), // 视频播放时间  Positioned( bottom: 90.0, left: 10.0, right: 10.0, child: Visibility( visible: sliderDraging, child: Row( mainAxisAlignment: MainAxisAlignment.center, children: [ Text(position.label(reference: duration), style: const TextStyle(color: Colors.white,),), Container( margin: const EdgeInsets.symmetric(horizontal: 7.0), child: const Text('/', style: TextStyle(color: Colors.white54, fontSize: 10.0,),), ), Text(duration.label(reference: duration), style: const TextStyle(color: Colors.white54,),), ], ), ), ), ], ); }, ), /// 固定层 // 红包  Positioned( left: 15.0, top: MediaQuery.of(context).padding.top + 20, child: Container( height: 40.0, width: 40.0, decoration: BoxDecoration( color: Colors.black12, borderRadius: BorderRadius.circular(100.0), ), child: UnconstrainedBox( child: Image.asset('assets/images/time-hb.png', width: 30.0, fit: BoxFit.contain,), ), ), ), ], ), ), ], ), );

flutter3直播模块

flutter直播模块包含了顶部信息、底部进场提示+商品层+弹幕层+操作栏等几个模块。

// 商品购买动效
Container(
  ...
),

// 加入直播间动效
const AnimationLiveJoin(
  joinQueryList: [
    {'avatar': 'assets/images/logo.png', 'name': 'andy'},
    {'avatar': 'assets/images/logo.png', 'name': 'jack'},
    {'avatar': 'assets/images/logo.png', 'name': '一条咸鱼'},
    {'avatar': 'assets/images/logo.png', 'name': '四季平安'},
    {'avatar': 'assets/images/logo.png', 'name': '叶子'},
  ],
),

// 送礼物动效
const AnimationLiveGift(
  giftQueryList: [
    {'label': '小心心', 'gift': 'assets/images/gift/gift1.png', 'user': 'Jack', 'avatar': 'assets/images/avatar/uimg2.jpg', 'num': 12},
    {'label': '棒棒糖', 'gift': 'assets/images/gift/gift2.png', 'user': 'Andy', 'avatar': 'assets/images/avatar/uimg6.jpg', 'num': 36},
    {'label': '大啤酒', 'gift': 'assets/images/gift/gift3.png', 'user': '一条咸鱼', 'avatar': 'assets/images/avatar/uimg1.jpg', 'num': 162},
    {'label': '人气票', 'gift': 'assets/images/gift/gift4.png', 'user': 'Flower', 'avatar': 'assets/images/avatar/uimg5.jpg', 'num': 57},
    {'label': '鲜花', 'gift': 'assets/images/gift/gift5.png', 'user': '四季平安', 'avatar': 'assets/images/avatar/uimg3.jpg', 'num': 6},
    {'label': '捏捏小脸', 'gift': 'assets/images/gift/gift6.png', 'user': 'Alice', 'avatar': 'assets/images/avatar/uimg4.jpg', 'num': 28},
    {'label': '你真好看', 'gift': 'assets/images/gift/gift7.png', 'user': '叶子', 'avatar': 'assets/images/avatar/uimg7.jpg', 'num': 95},
    {'label': '亲吻', 'gift': 'assets/images/gift/gift8.png', 'user': 'YOYO', 'avatar': 'assets/images/avatar/uimg8.jpg', 'num': 11},
    {'label': '玫瑰', 'gift': 'assets/images/gift/gift12.png', 'user': '宇辉', 'avatar': 'assets/images/avatar/uimg9.jpg', 'num': 3},
    {'label': '私人飞机', 'gift': 'assets/images/gift/gift16.png', 'user': 'Hison', 'avatar': 'assets/images/avatar/uimg10.jpg', 'num': 273},
  ],
),

// 直播弹幕+商品讲解
Container(
  margin: const EdgeInsets.only(top: 7.0),
  height: 200.0,
  child: Row(
    crossAxisAlignment: CrossAxisAlignment.end,
    children: [
      Expanded(
        child: ListView.builder(
          padding: EdgeInsets.zero,
          itemCount: liveJson[index]['message']?.length,
          itemBuilder: (context, i) => danmuList(liveJson[index]['message'])[i],
        ),
      ),
      SizedBox(
        width: isVisibleGoodsTalk ? 7 : 35,
      ),
      // 商品讲解
      Visibility(
        visible: isVisibleGoodsTalk,
        child: Column(
          ...
        ),
      ),
    ],
  ),
),

// 底部工具栏
Container(
  margin: const EdgeInsets.only(top: 7.0),
  child: Row(
    ...
  ),
),

直播聊天弹幕通过Flexible配合Text.rich / TextSpan实现消息自适应布局界面。

通过 SlideTransition 组件实现直播进场动画。

return SlideTransition(
  position: animationFirst ? animation : animationMix,
  child: Container(
    alignment: Alignment.centerLeft,
    margin: const EdgeInsets.only(top: 7.0),
    padding: const EdgeInsets.symmetric(horizontal: 7.0,),
    height: 23.0,
    width: 250,
    decoration: const BoxDecoration(
      gradient: LinearGradient(
        begin: Alignment.centerLeft,
        end: Alignment.centerRight,
        colors: [
          Color(0xFF6301FF), Colors.transparent
        ],
      ),
      borderRadius: BorderRadius.horizontal(left: Radius.circular(10.0)),
    ),
    child: joinList!.isNotEmpty ? 
      Text('欢迎 ${joinList![0]['name']} 加入直播间', style: const TextStyle(color: Colors.white, fontSize: 14.0,),)
      :
      Container()
    ,
  ),
);

class _AnimationLiveJoinState extends State<AnimationLiveJoin> with TickerProviderStateMixin {
  // 动画控制器
  late AnimationController controller = AnimationController(
    vsync: this,
    duration: const Duration(milliseconds: 500), // 第一个动画持续时间
  );
  late AnimationController controllerMix = AnimationController(
    vsync: this,
    duration: const Duration(milliseconds: 1000), // 第二个动画持续时间
  );
  // 动画
  late Animation<Offset> animation = Tween(begin: const Offset(2.5, 0), end: const Offset(0, 0)).animate(controller);
  late Animation<Offset> animationMix = Tween(begin: const Offset(0, 0), end: const Offset(-2.5, 0)).animate(controllerMix);

  Timer? timer;
  // 是否第一个动画
  bool animationFirst = true;
  // 是否空闲
  bool idle = true;
  // 加入直播间数据列表
  List? joinList;

  @override
  void initState() {
    super.initState();

    joinList = widget.joinQueryList!.toList();

    runAnimation();
    animation.addListener(() {
      if(animation.status == AnimationStatus.forward) {
        debugPrint('第一个动画进行中');
        idle = false;
        setState(() {});
      }else if(animation.status == AnimationStatus.completed) {
        debugPrint('第一个动画结束');
        animationFirst = false;
        if(controllerMix.isCompleted || controllerMix.isDismissed) {
          timer = Timer(const Duration(seconds: 2), () {
            controllerMix.forward();
            debugPrint('第二个动画开始');
          });
        }
        setState(() {});
      }
    });
    animationMix.addListener(() {
      if(animationMix.status == AnimationStatus.forward) {
        setState(() {});
      }else if(animationMix.status == AnimationStatus.completed) {
        animationFirst = true;
        controller.reset();
        controllerMix.reset();
        if(joinList!.isNotEmpty) {
          joinList!.removeAt(0);
        }
        idle = true;
        // 执行下一个数据
        runAnimation();
        setState(() {});
      }
    });
  }

  void runAnimation() {
    if(joinList!.isNotEmpty) {
      // 空闲状态才能执行，防止添加数据播放状态混淆
      if(idle == true) {
        if(controller.isCompleted || controller.isDismissed) {
          setState(() {});
          timer = Timer(Duration.zero, () {
            controller.forward();
          });
        }
      }
    }
  }

  @override
  void dispose() {
    controller.dispose();
    controllerMix.dispose();
    timer?.cancel();
    super.dispose();
  }

}