HarmonyOS 语音播报当中加上soundPool.on('complete')之后语音就不播报了

on(loadComplete)时机不对，没有执行，要写在load前面，只需要把回调放在load前面就行了。load底层是起了一个异步线程去进行解封装和解码的 await不会等待这个异步线程的, 所以await load后play也可能会出问题，所以标准的用法就是在loadComplete里面收到回调以后进行play。

private static async loadCallback() {
  // 加载完成回调
  SoundPlayer.sSoundPlayer!.mSoundPool!.on('loadComplete', async (soundId_: number) => {
    console.log('loadCallback')
    hilog.error(0x0000, 'testTag', '%{public}s', 'success = ' + soundId_);
    if (SoundPlayer.sSoundPlayer != undefined) {
      // 获取当前时间
      SoundPlayer.sPlayTime = systemDateTime.getTime(false);
      // play
      SoundPlayer.sSoundPlayer!.mStreamId = await SoundPlayer.sSoundPlayer.mSoundPool!.play(soundId_, SoundPlayer.sSoundPlayer.mPlayParameters);
    }
  });
}

public static async play(context: Context, rawPath: string) {
  if (SoundPlayer.sSoundPlayer == undefined) {
    SoundPlayer.sSoundPlayer = new SoundPlayer();
    await SoundPlayer.sSoundPlayer.init();
    SoundPlayer.loadCallback();
    SoundPlayer.sSoundPlayer.finishPlayCallback();
    SoundPlayer.sSoundPlayer.errorCallback();
  }
  let id: number = SoundPlayer.sSoundPlayer.mSoundPoolCache!.get(rawPath);
  if (id == undefined) {
    if (context == null) {
      return;
    }
    let fd = 0;
    let offset = 0;
    let length = 0;
    let rawFileDescriptor = context.resourceManager.getRawFdSync(rawPath);
    fd = rawFileDescriptor.fd;
    offset = rawFileDescriptor.offset;
    length = rawFileDescriptor.length;
    let soundId = await SoundPlayer.sSoundPlayer.mSoundPool!.load(fd, offset, length);
    SoundPlayer.sSoundPlayer.mSoundPoolCache!.set(rawPath, soundId);
  } else {
    try {
      SoundPlayer.sSoundPlayer.mStreamId = await SoundPlayer.sSoundPlayer.mSoundPool!.play(id,
        SoundPlayer.sSoundPlayer.mPlayParameters);
    } catch (e) {
      e.printStackTrace();
    }
  }
}