flutter - 关闭应用程序时保持 VideoPlayerController 播放音频

Question

我正在尝试开发一个向用户展示视频的应用程序。我正在使用 VideoPlayerController用于加载视频，以及 ChewieController对于用户界面。
效果很好，但是当用户关闭应用程序时，视频就会停止。我希望视频即使在关闭应用程序/锁定设备时也能继续播放音频。
我在 VideoPlayerController 上找不到任何相关信息并在 ChewieController文件。
这个功能在 Flutter 和 Dart 中可以实现吗？
谢谢!

Answer 1

不幸的是 Flutter 的 video_player包不支持背景视频或音频播放。但是你可以使用 flutter_playout包装 ExoPlayer在 Android 和 AVPlayer 上iOS 上的框架，能够在后台播放视频甚至锁定屏幕。您可以了解更多信息 here .下面是库的 GitHub 存储库提供的示例代码，它播放视频并在后台继续播放

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter_playout/multiaudio/HLSManifestLanguage.dart';
import 'package:flutter_playout/multiaudio/MultiAudioSupport.dart';
import 'package:flutter_playout/player_observer.dart';
import 'package:flutter_playout/player_state.dart';
import 'package:flutter_playout/video.dart';
import 'package:flutter_playout_example/hls/getManifestLanguages.dart';

class VideoPlayout extends StatefulWidget {
  final PlayerState desiredState;
  final bool showPlayerControls;

  const VideoPlayout({Key key, this.desiredState, this.showPlayerControls})
      : super(key: key);

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

class _VideoPlayoutState extends State<VideoPlayout>
    with PlayerObserver, MultiAudioSupport {
  final String _url = null;
  List<HLSManifestLanguage> _hlsLanguages = List<HLSManifestLanguage>();

  @override
  void initState() {
    super.initState();
    Future.delayed(Duration.zero, _getHLSManifestLanguages);
  }

  Future<void> _getHLSManifestLanguages() async {
    if (!Platform.isIOS && _url != null && _url.isNotEmpty) {
      _hlsLanguages = await getManifestLanguages(_url);
      setState(() {});
    }
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      child: Column(
        children: <Widget>[
          /* player */
          AspectRatio(
            aspectRatio: 16 / 9,
            child: Video(
              autoPlay: true,
              showControls: widget.showPlayerControls,
              title: "MTA International",
              subtitle: "Reaching The Corners Of The Earth",
              preferredAudioLanguage: "eng",
              isLiveStream: true,
              position: 0,
              url: _url,
              onViewCreated: _onViewCreated,
              desiredState: widget.desiredState,
            ),
          ),
          /* multi language menu */
          _hlsLanguages.length < 2 && !Platform.isIOS
              ? Container()
              : Container(
                  child: Row(
                    children: _hlsLanguages
                        .map((e) => MaterialButton(
                              child: Text(
                                e.name,
                                style: Theme.of(context)
                                    .textTheme
                                    .button
                                    .copyWith(color: Colors.white),
                              ),
                              onPressed: () {
                                setPreferredAudioLanguage(e.code);
                              },
                            ))
                        .toList(),
                  ),
                ),
        ],
      ),
    );
  }

  void _onViewCreated(int viewId) {
    listenForVideoPlayerEvents(viewId);
    enableMultiAudioSupport(viewId);
  }

  @override
  void onPlay() {
    // TODO: implement onPlay
    super.onPlay();
  }

  @override
  void onPause() {
    // TODO: implement onPause
    super.onPause();
  }

  @override
  void onComplete() {
    // TODO: implement onComplete
    super.onComplete();
  }

  @override
  void onTime(int position) {
    // TODO: implement onTime
    super.onTime(position);
  }

  @override
  void onSeek(int position, double offset) {
    // TODO: implement onSeek
    super.onSeek(position, offset);
  }

  @override
  void onDuration(int duration) {
    // TODO: implement onDuration
    super.onDuration(duration);
  }

  @override
  void onError(String error) {
    // TODO: implement onError
    super.onError(error);
  }
}