IONIC 3录制音频在第二次录制后无法正常工作

Question

在我在Ionic 3上的应用程序中，我使用来自'@ ionic-native / media'的Media和MediaObject来录制音频并且这有效，音频被录制和播放，但在我录制一个音频后，MediaObject.startRecording不返回错误并创建音频文件，但是当我播放文件时，没有音频正在播放。 下面是我的.ts代码。

//This is my variables:

  private recording: boolean = false;
  private recordingIco: string = 'assets/img/micico.png';
  private filePath: string;
  private fileName: string;
  private audio: MediaObject;
  audioList: any[] = [];
  public recordingMessage = "Wating for records..."
  public MEDIA_FILES_KEY = 'mediaFiles';
  private audioURI:any;
  private audioFileName:any; 
  private isPlay:boolean = false;
  private audioIco: string = 'assets/img/playico.png';

//This is my constructor:

constructor(public navCtrl: NavController, public navParams: NavParams, public http: Http, private media: Media, private file: File, public platform: Platform, private mediaCapture: MediaCapture, private storage: Storage, private transfer: FileTransfer) {}

//This is my rec and play functions:

  startRecord() {
    let audioRec:MediaObject;
    this.recordingMessage = "Device is preparing to record...";
    if (this.platform.is('ios')) {
      this.fileName = 'record'+new Date().getDate()+new Date().getMonth()+new Date().getFullYear()+new Date().getHours()+new Date().getMinutes()+new Date().getSeconds()+'.3gp';
      this.filePath = this.file.dataDirectory + this.fileName;
      this.audio = this.media.create(this.filePath);
    } else if (this.platform.is('android')) {
      this.fileName = 'record'+new Date().getDate()+new Date().getMonth()+new Date().getFullYear()+new Date().getHours()+new Date().getMinutes()+new Date().getSeconds()+'.3gp';
      this.filePath = this.file.dataDirectory + this.fileName;
      this.audio = this.media.create(this.filePath);
      console.log("recording file = " + this.filePath);
    }
    console.log("start recording...");
    this.audio.startRecord();
    console.log("recording is started...");
    this.recordingMessage = "Device is recording...";
    this.recording = true;
  }

  stopRecord() {
    this.audio.stopRecord();
    console.log("Recording is stoped...");
    this.recordingMessage = "Recording is ended...";
    let data = { filename: this.fileName };
    this.audioList.push(data);
    localStorage.setItem("audiolist", JSON.stringify(this.audioList));
    this.recording = false;
  }

  playAudio() {
    if (this.platform.is('ios')) {
      this.filePath = this.file.dataDirectory + this.fileName;
      this.audio = this.media.create(this.filePath);
    } else if (this.platform.is('android')) {
      this.filePath = this.file.dataDirectory + this.fileName;
      this.audio = this.media.create(this.filePath);
    }
    this.audio.play();
    this.audio.setVolume(0.8);
    console.log("The device is playing audio...");
    this.recordingMessage = "Device is playing audio...";
  }