douyin_demo/lib/views/video_back.dart

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

class VideoBack extends StatefulWidget {
  VideoBack({Key key}) : super(key: key);

  _VideoBackState createState() => _VideoBackState();
}

class _VideoBackState extends State<VideoBack> {
  VideoPlayerController _controller;
  bool _isPlaying = false;
  String url =
      "https://www.guojio.com/video/07a7faa1-3696-4af7-aeac-2d6cf6bf25f9.mp4";

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    _controller = VideoPlayerController.network(this.url)
    // 播放状态
      ..addListener(() {
        final bool isPlaying = _controller.value.isPlaying;
        if (isPlaying != _isPlaying) {
          setState(() {
            _isPlaying = isPlaying;
          });
        }
      })
    // 在初始化完成后必须更新界面
      ..initialize().then((_) {
        setState(() {});
      });
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      child: _controller.value.isInitialized
      // 加载成功
          ? AspectRatio(
        aspectRatio: _controller.value.aspectRatio,
        child: VideoPlayer(_controller),
      )
          : Container(),
    );
  }
}