HarmonyOS 怎么获取当前系统的音量

可以在入口初始化时，使用以下写法监听音量：

import { audio } from '@kit.AudioKit';

@Entry
@Component
struct ceshi {
  private audioManager = audio.getAudioManager();
  private audioVolumeManager = this.audioManager.getVolumeManager();
  aboutToAppear(): void {
    console.info(VolumeType of stream:--1-- );
    this.audioVolumeManager.on('volumeChange', (volumeEvent) => {
      console.info(VolumeType of stream:--2-- );
      console.info(VolumeType of stream: ${volumeEvent.volumeType} );
      console.info(VolumeType Volume level: ${volumeEvent.volume} );
      console.info(VolumeType Whether to updateUI: ${volumeEvent.updateUi} );
    });
  }
  build() {
  }
}