flutter开发实战-video_player插件播放抖音直播实现（仅限Android端）

在之前的开发过程中，遇到video_player播放视频，通过查看video_player插件描述，可以看到video_player在Android端使用exoplayer，在iOS端使用的是AVPlayer。由于iOS的AVPlayer不支持flv、m3u8格式的直播，这里video_player播放抖音直播仅仅在Android有效，在iOS端，如果需要播放抖音直播，可以使用fijkplayer插件进行播放，由于fijkplayer使用的是ijkplayer，可以播放flv、m3u8格式的直播。

一、引入

在pubspec.yaml中引入video_player

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  # 播放器
  video_player: ^2.7.0
  # fijkplayer: ^0.11.0

2.1 在iOS中的设置

在iOS工程中info.plist添加一下设置，以便支持Https，HTTP的视频地址

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<key>NSAppTransportSecurity</key>
<dict>
	<key>NSAllowsArbitraryLoads</key>
	<true/>
</dict>

2.2 在Android中的设置

需要在/android/app/src/main/AndroidManifest.xml文件中添加网络权限

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<uses-permission android:name="android.permission.INTERNET"/>

2.3 播放的VideoPlayer

使用video_player插件，需要使用VideoPlayerController来控制播放、暂停、添加监听

初始化后添加监听，来获取VideoPlayerController中的Value值，可以看到一些状态。例如

VideoPlayerValue(duration: 0:00:00.001000, size: Size(1280.0, 720.0), position: 0:32:14.877000, caption: Caption(number: 0, start: 0:00:00.000000, end: 0:00:00.000000, text: ), captionOffset: 0:00:00.000000, buffered: [DurationRange(start: 0:00:00.000000, end: 0:32:17.868000)], isInitialized: true, isPlaying: true, isLooping: false, isBuffering: false, volume: 1.0, playbackSpeed: 1.0, errorDescription: null, isCompleted: false)

添加监听

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// 添加监听
  void addListener() {
    if (_controller != null) {
      _controller!.addListener(videoListenerCallback);
    }
  }

移除监听

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// 移除监听
  void removeListener() {
    if (_controller != null) {
      _controller!.removeListener(videoListenerCallback);
    }
  }

监听的callback回调

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void videoListenerCallback() {
    // 监听结果
    if (_controller != null) {
      if (_controller!.value.hasError) {
        // 出现错误
        setState(() {});
      }

      if (_controller!.value.isCompleted) {
        // 直播完成
        setState(() {});
      }

      if (_controller!.value.isBuffering) {
        // 正在buffer
      }

      if (_controller!.value.hasError || _controller!.value.isCompleted) {
        // 是否处于错误状态 或者 播放完成
        if (widget.liveController.onOutLinkPlayerCompleted != null) {
          widget.liveController.onOutLinkPlayerCompleted!();
        }
      }

      if (_controller!.value.hasError == false) {
        // 可播放，隐藏封面
        if (widget.liveController.onOutLinkPlayerCanPlay != null) {
          widget.liveController.onOutLinkPlayerCanPlay!();
        }
      }
    }
  }

播放

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Future<void> play() async {
if (_controller != null) {
	await _controller?.play();
    }
}

暂停

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Future<void> play() async {
if (_controller != null) {
	await _controller?.pause();
    }
}

完整代码如下

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//  视频播放测试
class VideoPlayerSkeleton extends StatefulWidget {
  const VideoPlayerSkeleton({
    Key? key,
    required this.videoUrl,
    required this.isLooping,
    this.autoPlay = true,
    required this.width,
    required this.height,
  }) : super(key: key);

  final String videoUrl;
  final bool isLooping;
  final bool autoPlay;
  final double width;
  final double height;

  @override
  State<VideoPlayerSkeleton> createState() => _VideoPlayerSkeletonState();
}

class _VideoPlayerSkeletonState extends State<VideoPlayerSkeleton> {
  VideoPlayerController? _controller;

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

    videoPlay();
    print("_VideoPlayerSkeletonState videoUrl:${widget.videoUrl}");
  }

  // 添加监听
  void addListener() {
    if (_controller != null) {
      _controller!.addListener(videoListenerCallback);
    }
  }

  void videoListenerCallback() {
    // 监听结果
    if (_controller != null) {
      if (_controller!.value.hasError) {
        // 出现错误
        setState(() {});
      }

      if (_controller!.value.isCompleted) {
        // 直播完成
        setState(() {});
      }

      if (_controller!.value.isBuffering) {
        // 正在buffer
      }
    }
  }

  // 移除监听
  void removeListener() {
    if (_controller != null) {
      _controller!.removeListener(videoListenerCallback);
    }
  }

  // 播放视频
  Future<void> videoPlay() async {
    _controller?.dispose();

    _controller = VideoPlayerController.networkUrl(
      Uri.parse(widget.videoUrl),
      videoPlayerOptions: VideoPlayerOptions(
        mixWithOthers: true,
        allowBackgroundPlayback: false,
      ),
    );

    addListener();

    await _controller?.initialize().then((_) {
      // Ensure the first frame is shown after the video is initialized, even before the play button has been pressed.
      setState(() {});
    }).catchError((error) {
      // 是否处于错误状态 或者 播放完成
      if (widget.liveController.onOutLinkPlayerCompleted != null) {
        widget.liveController.onOutLinkPlayerCompleted!();
      }
    }).whenComplete(() {
      // print('checkAnimationTimeout whenComplete');
    });

    await _controller!.setLooping(widget.isLooping);
    if (widget.autoPlay) {
      await _controller?.play();
    } else {
      await _controller?.pause();
    }
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      width: widget.width,
      height: widget.height,
      color: Colors.black87,
      child: Stack(
        alignment: Alignment.center,
        children: [
          buildVideoPlayer(context),
          buildStateIntro(context),
        ],
      ),
    );
  }

  // 播放视频
  Widget buildVideoPlayer(BuildContext context) {
    if (_controller != null && _controller!.value.isInitialized) {
      return AspectRatio(
        aspectRatio: _controller!.value.aspectRatio,
        child: VideoPlayer(_controller!),
      );
    }
    return Container();
  }

  // 播放过程中出现error
  Widget buildStateIntro(BuildContext context) {
    if (_controller != null) {
      String title = "";
      String message = "";
      bool showIntro = false;
      if (_controller!.value.hasError) {
        showIntro = true;
        title = "播放出现错误";
        message = _controller!.value.errorDescription ?? "";
      } else {
        if (_controller!.value.isCompleted) {
          showIntro = true;
          title = "播放结束";
        }
      }

      if (showIntro) {
        return Container(
          padding: EdgeInsets.symmetric(vertical: 50.r, horizontal: 50.r),
          color: Colors.transparent,
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [
              Expanded(child: Container()),
              Text(
                title,
                textAlign: TextAlign.center,
                softWrap: true,
                style: TextStyle(
                  fontSize: 28.r,
                  fontWeight: FontWeight.w500,
                  fontStyle: FontStyle.normal,
                  color: Colors.white,
                  decoration: TextDecoration.none,
                ),
              ),
              SizedBox(
                height: 25.r,
              ),
              Text(
                message,
                textAlign: TextAlign.center,
                softWrap: true,
                style: TextStyle(
                  fontSize: 22.r,
                  fontWeight: FontWeight.w500,
                  fontStyle: FontStyle.normal,
                  color: Colors.white,
                  decoration: TextDecoration.none,
                ),
              ),
              Expanded(child: Container()),
            ],
          ),
        );
      }
    }

    return Container();
  }

  @override
  void dispose() {
    // TODO: implement dispose
    removeListener();
    _controller?.dispose();
    super.dispose();
  }
}