flutter开发实战-video_player视频播放功能及视频缓存

import 'package:flutter/material.dart';
import 'package:video_player/video_player.dart';
 
void main() => runApp(MyApp());
 
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: VideoPlayerScreen(),
    );
  }
}
 
class VideoPlayerScreen extends StatefulWidget {
  @override
  _VideoPlayerScreenState createState() => _VideoPlayerScreenState();
}
 
class _VideoPlayerScreenState extends State<VideoPlayerScreen> {
  VideoPlayerController _controller;
 
  @override
  void initState() {
    super.initState();
    _controller = VideoPlayerController.network(
        'https://flutter.github.io/assets-for-api-docs/assets/videos/butterfly.mp4')
      ..initialize().then((_) {
        // 初始化完成后播放视频
        setState(() {});
      });
  }
 
  @override
  void dispose() {
    super.dispose();
    _controller.dispose();
  }
 
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: _controller.value.isInitialized
          ? AspectRatio(
              aspectRatio: _controller.value.aspectRatio,
              child: VideoPlayer(_controller),
            )
          : Center(
              child: CircularProgressIndicator(),
            ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          setState(() {
            _controller.value.isPlaying ? _controller.pause() : _controller.play();
          });
        },
        child: Icon(
          _controller.value.isPlaying ? Icons.pause : Icons.play_arrow,
        ),
      ),
    );
  }
}

这段代码展示了如何使用Flutter的video\_player插件来实现视频播放功能，并在初始化后自动播放视频。同时，它提供了播放和暂停视频的功能，并在视频加载时显示一个进度指示器。这是一个简洁而实用的视频播放器示例。