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

class VideoPage extends StatefulWidget {
  final String url;
  VideoPage({Key key, this.url}) : super(key: key);
  @override
  _VideoPageState createState() => _VideoPageState();
}

class _VideoPageState extends State<VideoPage> {
  VideoPlayerController _controller;

  @override
  void initState() {
    _controller =
        VideoPlayerController.network(widget.url.replaceFirst('http', 'https'))
          ..initialize().then((_) {
            setState(() {
              _controller.play();
            });
          });

    // Use the controller to loop the video.
    _controller.setLooping(true);

    super.initState();
  }

  @override
  void dispose() {
    // Ensure disposing of the VideoPlayerController to free up resources.
    _controller.dispose();

    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('预告片'),
      ),
      body: Center(
        child: _controller.value.initialized
            ? AspectRatio(
                aspectRatio: _controller.value.aspectRatio,
                child: VideoPlayer(_controller),
              )
            : CircularProgressIndicator(),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          setState(() {
            if (_controller.value.isPlaying) {
              _controller.pause();
            } else {
              _controller.play();
            }
          });
        },
        child: Icon(
          _controller.value.isPlaying ? Icons.pause : Icons.play_arrow,
        ),
      ),
    );
  }
}

详细介绍：https://www.jianshu.com/p/caf7e3cd0df6