HarmonyOS AVPlayer 播放问题

// 注册avplayer回调函数 
setAVPlayerCallback(avPlayer: media.AVPlayer) { 
  // seek操作结果回调函数 
  avPlayer.on('seekDone', (seekDoneTime: number) => { 
    console.info(`AVPlayer seek succeeded, seek time is ${seekDoneTime}`); 
  }) 
  // error回调监听函数,当avPlayer在操作过程中出现错误时调用 reset接口触发重置流程 
  avPlayer.on('error', (err: BusinessError) => { 
    console.error(`Invoke avPlayer failed, code is ${err.code}, message is ${err.message}`); 
    avPlayer.reset(); // 调用reset重置资源，触发idle状态 
  }) 
  // 状态机变化回调函数 
  avPlayer.on('stateChange', async (state: string, reason: media.StateChangeReason) => { 
    this.state = state 
    switch (state) { 
      case 'idle': // 成功调用reset接口后触发该状态机上报 
        console.info('AVPlayer state idle called.'); 
        avPlayer.release(); // 调用release接口销毁实例对象 
        break; 
      case 'initialized': // avplayer 设置播放源后触发该状态上报 
        console.info('AVPlayer state initialized called.'); 
        avPlayer.prepare(); 
        break; 
      case 'prepared': // prepare调用成功后上报该状态机 
        console.info('AVPlayer state prepared called.'); 
        avPlayer.play(); // 调用播放接口开始播放 
        break; 
      case 'playing': // play成功调用后触发该状态机上报 
        console.info('AVPlayer state playing called.'); 
        if (this.count !== 0) { 
          if (this.isSeek) { 
            console.info('AVPlayer start to seek.'); 
            avPlayer.seek(avPlayer.duration); //seek到音频末尾 
          } else { 
            // 当播放模式不支持seek操作时继续播放到结尾 
            console.info('AVPlayer wait to play end.'); 
          } 
        } else { 
          avPlayer.pause(); // 调用暂停接口暂停播放 
        } 
        this.count++; 
        break; 
      case 'paused': // pause成功调用后触发该状态机上报 
        console.info('AVPlayer state paused called.'); 
        avPlayer.play(); // 再次播放接口开始播放 
        break; 
      case 'completed': // 播放结束后触发该状态机上报 
        console.info('AVPlayer state completed called.'); 
        avPlayer.stop(); //调用播放结束接口 
        break; 
      case 'stopped': // stop接口成功调用后触发该状态机上报 
        console.info('AVPlayer state stopped called.'); 
        avPlayer.reset(); // 调用reset接口初始化avplayer状态 
        break; 
      case 'released': 
        console.info('AVPlayer state released called.'); 
        break; 
      default: 
        console.info('AVPlayer state unknown called.'); 
        break; 
    } 
  }) 
} 
async avPlayerLive(item:DDAVPlayerItem) { 
  // 创建avPlayer实例对象 
  let avPlayer: media.AVPlayer = await media.createAVPlayer(); 
  // 创建状态机变化回调函数 
  this.setAVPlayerCallback(avPlayer); 
  this.isSeek = false; // 不支持seek操作 
  avPlayer.url = item.audioUrl; 
  avPlayer = avPlayer; 
  playItem =  item; 
}