flutter3-douyin：基于flutter3.x+getx+mediaKit短视频直播App应用

经过大半个月的爆肝式开发输出，又一个跨端新项目Flutter-Douyin短视频正式完结了。

flutter3_douyin基于最新跨平台技术flutter3.19.2开发手机端仿抖音app实战项目。

实现了类似抖音全屏沉浸式上下滑动视频、左右滑动切换页面模块，直播间进场/礼物动画，聊天等模块功能。

使用技术

• 编辑器：vscode
• 技术框架：flutter3.19.2+dart3.3.0
• 路由/状态插件：get: ^4.6.6
• 本地缓存服务：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

项目结构

前期需要配置好flutter和dart sdk环境。如果使用vscode编辑器，可以安装一些flutter语法插件。

更多的开发api资料，大家可以去官网查阅就行。

flutter.dev/ flutter.cn/ pub.flutter-io.cn/ www.dartcn.com/

该项目涉及到的技术知识还是蛮多的。下面主要介绍一些短视频及直播知识，至于其它知识点，大家可以去看看之前分享的flutter3聊天项目文章。

www.cnblogs.com/xiaoyan2017…

www.cnblogs.com/xiaoyan2017…

flutter主入口lib/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自定义底部凸起导航

采用 bottomNavigationBar 组件实现页面模块切换。通过getx状态管理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;
                });
              },
            ),
          ),
        ],
      );
    }),
  ),
);

flutter3实现抖音滑动效果

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
              ],
            ),
          ],
        ),
      ),
    ],
  ),
);

flutter实现直播功能

// 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(
    ...
  ),
),

flutter直播通过 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();
  }

}