Flutter-flutter_sound录音与播放-六虎

插件介绍：

flutter_sound这个插件能够实现iOS和Android平台的录音和播映功能。即能够播映本地音频文件，也能够播映远程URL文件。在这儿我讲介绍这个插件的用法以及碰到的一些常见问题怎么处理。

flutter_sound支撑多种录音格局
flutter_sound支撑多种播映格局
flutter_sound支撑音频振幅大小

插件信息：

插件地址：github.com/ryanheise/a…

插件版别：9.2.9

插件运用前的准备工作

设置麦克风权限描绘

iOS：需要在info.plist文件添加一下权限

<key>NSMicrophoneUsageDescription</key>
<string>描绘你运用麦克风用来干嘛</string>

留意：还需要在Podfile文件中配置

post_install do |installer|
  installer.pods_project.targets.each do |target|
    flutter_additional_ios_build_settings(target)
  target.build_configurations.each do |config|
        config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= [
          '$(inherited)',
          ## dart: PermissionGroup.microphone
          'PERMISSION_MICROPHONE=1',
        ]
      end
    end
  end

还需要在iOS工程中添加libc++.tbd库，具体途径

Android：需要设置AndroidManifest.xml

<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

这儿还用了下面几个插件

权限办理插件 permission_handler

插件信息：permission_handler: ^9.2.0

插件地址：pub.flutter-io.cn/packages/pe…

音频硬件配置插件 audio_session

插件信息：audio_session: ^0.1.6

插件地址：github.com/ryanheise/a…

动画插件

插件信息：lottie: 1.2.1

插件地址：pub.flutter-io.cn/packages/fl…

常用的办法

录音常见的办法

初始化录音对象

FlutterSoundRecorder recorderModule = FlutterSoundRecorder();

开启录音

Future<void> init() async {
  //开启录音
  await recorderModule.openRecorder();
  //设置订阅计时器
  await recorderModule
      .setSubscriptionDuration(const Duration(milliseconds: 10));
  //初始化日期插件
  await initializeDateFormatting();
}

麦克风权限

Future<bool> getPermissionStatus() async {
  Permission permission = Permission.microphone;
  //granted 通过，denied 被回绝，permanentlyDenied 回绝且不在提示
  PermissionStatus status = await permission.status;
  if (status.isGranted) {
    return true;
  } else if (status.isDenied) {
    requestPermission(permission);
  } else if (status.isPermanentlyDenied) {
    openAppSettings();
  } else if (status.isRestricted) {
    requestPermission(permission);
  } else {}
  return false;
}
///申请权限
void requestPermission(Permission permission) async {
  PermissionStatus status = await permission.request();
  if (status.isPermanentlyDenied) {
    openAppSettings();
  }
}

开端录音

/// 开端录音
_startRecorder() async {
  try {
    //获取麦克风权限
    await getPermissionStatus().then((value) async {
      if (!value) {
        return;
      }
      //用户允许运用麦克风之后开端录音
      Directory tempDir = await getTemporaryDirectory();
      var time = DateTime.now().millisecondsSinceEpoch;
      String path = '${tempDir.path}/$time${ext[Codec.aacADTS.index]}';
      //这儿我录制的是aac格局的，还有其他格局
      await recorderModule.startRecorder(
        toFile: path,
        codec: Codec.aacADTS,
        bitRate: 8000,
        numChannels: 1,
        sampleRate: 8000,
      );
      /// 监听录音
      _recorderSubscription = recorderModule.onProgress!.listen((e) {
        var date = DateTime.fromMillisecondsSinceEpoch(
            e.duration.inMilliseconds,
            isUtc: true);
        var txt = DateFormat('mm:ss:SS', 'en_GB').format(date);
        //设置了最大录音时长
        if (date.second >= _maxLength) {
          _stopRecorder();
          return;
        }
        setState(() {
          //更新录音时长
          _recordText = txt.substring(1, 5);
        });
      });
      setState(() {
         //更新录音状况和录音文件途径
        _state = RecordPlayState.recording;
        _path = path;
      });
    });
  } catch (err) {
    setState(() {
      _stopRecorder();
      _state = RecordPlayState.record;
      _cancelRecorderSubscriptions();
    });
  }
}

完毕录音

/// 完毕录音
_stopRecorder() async {
  try {
    await recorderModule!.stopRecorder().then((value) {
     _cancelRecorderSubscriptions();
    });
  } catch (err) {}
  setState(() {
    _state = RecordPlayState.record;
  });
}
///毁掉录音
void dispose() {
  super.dispose();
  _cancelRecorderSubscriptions();
  _releaseFlauto();
}
/// 撤销录音监听
void _cancelRecorderSubscriptions() {
  if (_recorderSubscription != null) {
    _recorderSubscription!.cancel();
    _recorderSubscription = null;
  }
}
/// 开释录音
Future<void> _releaseFlauto() async {
  try {
    await recorderModule.closeRecorder();
  } catch (e) {}
}
/// 判别文件是否存在
Future<bool> _fileExists(String path) async {
  return await File(path).exists();
}

播映常见的办法

初始化播映器

FlutterSoundPlayer playerModule = FlutterSoundPlayer();

初始化操作

init() async {
  await playerModule.openPlayer();
  await playerModule
      .setSubscriptionDuration(const Duration(milliseconds: 10));
//这块是设置音频，暂时没用到能够不用设置
  final session = await AudioSession.instance;
  await session.configure(AudioSessionConfiguration(
    avAudioSessionCategory: AVAudioSessionCategory.playAndRecord,
    avAudioSessionCategoryOptions:
        AVAudioSessionCategoryOptions.allowBluetooth |
            AVAudioSessionCategoryOptions.defaultToSpeaker,
    avAudioSessionMode: AVAudioSessionMode.spokenAudio,
    avAudioSessionRouteSharingPolicy:
        AVAudioSessionRouteSharingPolicy.defaultPolicy,
    avAudioSessionSetActiveOptions: AVAudioSessionSetActiveOptions.none,
    androidAudioAttributes: const AndroidAudioAttributes(
      contentType: AndroidAudioContentType.speech,
      flags: AndroidAudioFlags.none,
      usage: AndroidAudioUsage.voiceCommunication,
    ),
    androidAudioFocusGainType: AndroidAudioFocusGainType.gain,
    androidWillPauseWhenDucked: true,
  ));
}

开端播映

///开端播映，这儿做了一个播映状况的回调
void startPlayer(PlayStateBack callBack) async {
  try {
    if (path.contains('http')) {
      await playerModule.startPlayer(
          fromURI: path,
          codec: Codec.mp3,
          sampleRate: 44000,
          whenFinished: () {
            stopPlayer();
            callBack(0);
          });
    } else {
      //判别文件是否存在
      if (await _fileExists(path)) {
        if (playerModule.isPlaying) {
          playerModule.stopPlayer();
        }
        await playerModule.startPlayer(
            fromURI: path,
            codec: Codec.aacADTS,
            sampleRate: 44000,
            whenFinished: () {
              stopPlayer();
              callBack(0);
            });
      } else {}
    }
    //监听播映进展
    _playerSubscription = playerModule.onProgress!.listen((e) {});
    callBack(1);
  } catch (err) {
    callBack(0);
  }
}

完毕播映

/// 完毕播映
void stopPlayer() async {
  try {
    await playerModule.stopPlayer();
    cancelPlayerSubscriptions();
  } catch (err) {}
}
/// 撤销播映监听
void cancelPlayerSubscriptions() {
  if (_playerSubscription != null) {
    _playerSubscription!.cancel();
    _playerSubscription = null;
  }
}
///获取播映状况
Future<PlayerState> getPlayState() async {
  return await playerModule.getPlayerState();
}
/// 开释播映器
void releaseFlauto() async {
  try {
    await playerModule!.closePlayer().then((value){
       cancelPlayerSubscriptions();
       if(playerModule != null){
         playerModule = null;
       }
    });
  } catch (e) {
    print(e);
  }
}
/// 判别文件是否存在
Future<bool> _fileExists(String path) async {
  return await File(path).exists();
}

动画实现

在进行录音和播映的过程中难免运用到动画，这儿我说下怎么加载gif和动画文件

加载GIF动画

Visibility(
  visible: (item.playing.value == 1) ? true : false,
  child: Image.asset('assets/-comm/comm_audio_paly.gif', width: 20, height: 20,),
  replacement: const Image(
    image: AssetImage('assets/-comm/comm_audio_icon.png'),
    width: 20,
    height: 20,
  ),
)

加载动画文件

Lottie.asset('assets/-comm/record_audio_animation.json',
    height: 25,
    width: ScreenAdapter.screenWidth() -ScreenAdapter.width(160),
    animate: true)

上传文件

上传音频文件

var map = {
  "file": MultipartFile.fromBytes(
      await File.fromUri(Uri(path: path)).readAsBytes(),
      filename: "$fileName.mp3",
      contentType: MediaType.parse("audio/mp3"))
};

留意

在9.2.13版别曾经，假如是iOS和Flutter混编项目，如果首次进入Flutter模块，这个插件运用是没有问题的，可是当脱离这个模块第2次进入就会出现注册插件犯错、初始化失利的状况。报错如下：

ERROR during registerWithRegistrar: flutterSoundPlayerManager != nil
MissingPluginException(No implementation found for method resetPlugin on channel com.dooboolab.flutter_sound_player)

这是插件确实存在的bug，目前作者已经在最新版别9.2.13上做了修正。

总结

上面介绍了怎么录音，怎么播映本地和远程音频文件，以及怎么实现动画，在录制完音频文件后怎么上传，这些都是咱们往常运用这个功能会遇到的问题。在运用的过程中遇到的问题也有列出，希望对您有所帮助。

Flutter-flutter_sound录音与播放