Flutter使用Video_Player官方库以在App中播放视频/音频

2021-08-0620:54:00 发表评论

摘要

查阅Flutter官方文档，想要在flutter中播放视频，只需要安装一个名为Video_Player的官方依赖库，并在Android和iOS相对应的文件中添加允许许可就可以了，这个不仅支持引用网络文件，也支持本地文件，不仅支持视频，也支持音频，虽然外观比较简洁，但是可以根据自己的需求进行自定义……

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开篇寄语

查阅Flutter官方文档，想要在flutter中播放视频，只需要安装一个名为Video_Player的官方依赖库，并在Android和iOS相对应的文件中添加允许许可就可以了，这个不仅支持引用网络文件，也支持本地文件，不仅支持视频，也支持音频，虽然外观比较简洁，但是可以根据自己的需求进行自定义。

前情提要

内容详情

以下内容大多是更改lib下的main.dart文件内容，删掉里面的内容，复制粘贴代码，开启调试就可以出现了。

先要安装video player这个支撑库，在pubspec.yaml文件，添加库：

dependencies:
  video_player: ^2.1.6

或者在termianl，输入以下命令安装：

flutter pub add video_player

安装完成后，接下来则是，添加android和ios视频调用权限，Android系统在android/app/src/main/中的AndroidManifest.xml文件添加以下代码<uses-permission android:name="android.permission.INTERNET"/>：

<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application ...>

    </application>

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

如下图所示：

iOS系统在ios/Runner/中的Info.plist文件添加以下代码：

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

如下图所示：

接着在main.dart文件输入以下代码：

import 'dart:async';

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

void main() => runApp(VideoPlayerApp());

class VideoPlayerApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Video Player Demo',
      home: VideoPlayerScreen(),
    );
  }
}

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

  @override
  _VideoPlayerScreenState createState() => _VideoPlayerScreenState();
}

class _VideoPlayerScreenState extends State<VideoPlayerScreen> {
  late VideoPlayerController _controller;
  late Future<void> _initializeVideoPlayerFuture;

  @override
  void initState() {
    // Create and store the VideoPlayerController. The VideoPlayerController
    // offers several different constructors to play videos from assets, files,
    // or the internet.
    _controller = VideoPlayerController.network(
      'https://flutter.github.io/assets-for-api-docs/assets/videos/butterfly.mp4',
    );

    // Initialize the controller and store the Future for later use.
    _initializeVideoPlayerFuture = _controller.initialize();

    // 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('Butterfly Video'),
      ),
      // Use a FutureBuilder to display a loading spinner while waiting for the
      // VideoPlayerController to finish initializing.
      body: FutureBuilder(
        future: _initializeVideoPlayerFuture,
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.done) {
            // If the VideoPlayerController has finished initialization, use
            // the data it provides to limit the aspect ratio of the video.
            return AspectRatio(
              aspectRatio: _controller.value.aspectRatio,
              // Use the VideoPlayer widget to display the video.
              child: VideoPlayer(_controller),
            );
          } else {
            // If the VideoPlayerController is still initializing, show a
            // loading spinner.
            return Center(child: CircularProgressIndicator());
          }
        },
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          // Wrap the play or pause in a call to `setState`. This ensures the
          // correct icon is shown.
          setState(() {
            // If the video is playing, pause it.
            if (_controller.value.isPlaying) {
              _controller.pause();
            } else {
              // If the video is paused, play it.
              _controller.play();
            }
          });
        },
        // Display the correct icon depending on the state of the player.
        child: Icon(
          _controller.value.isPlaying ? Icons.pause : Icons.play_arrow,
        ),
      ),
    );
  }
}

生成效果如下图所示：