Flutter 从 api 获取 VideoPlayerController url

Question

initState api 处的颤振视频控制器尚未请求..

 void initState() {
        super.initState();
        **initializePlayer(url);**
      }

应该如何将视频控制器初始化为 init state with.. URL 是从 snapshop 获取的未来形式..

Future<void> initializePlayer({String url}) async {
    _vidController = VideoPlayerController.network(url);
    await _vidController.initialize();

    _chewieController = ChewieController(
      videoPlayerController: _vidController,
      autoPlay: true,
      looping: true,
    );
    setState(() {});
  }

body: FutureBuilder(
          future: Provider.of<ApiService>(context, listen: false)
              .getLessonDetail(
                  courseId: widget.courseId, lessonId: widget.lessonId),
          builder: (BuildContext context, AsyncSnapshot<Lesson> snapshot) {
            if (snapshot.connectionState == ConnectionState.done) {
              if (snapshot.hasData) {
                final lesson = snapshot.data;


                String videoUrl =
                    "${AppURL.assetFromJr}video/course_${lesson.courseId}/chapter_${lesson.chapterId}/${lesson.lessonMobileVideo}?token=$videoNetworkToken}";
                **initializePlayer(url: videoUrl);**

如何在不调用 initState 或从快照数据 url 播放视频链接的情况下播放视频..

Answer 1

你应该将你的未来转移到 initState：

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
Future future;
  @override
  void initState() {
    super.initState();

    // NOTE this! we put future here instead of in the build!
   future = Provider.of<ApiService>(context, listen: false)
        .getLessonDetail(courseId: widget.courseId, lessonId: widget.lessonId);
    future.then(() async {
      _vidController = VideoPlayerController.network(url);
      await _vidController.initialize();

      _chewieController = ChewieController(
        videoPlayerController: _vidController,
        autoPlay: true,
        looping: true,
      );
      setState(() {});
    });
  }

  @override
  Widget build(BuildContext context) {
    if (_vidController == null)
      return Text('loading...');
    else
      return YourVideoWidgetUsingTheControllers(use_your_future: future);
  }
}