HarmonyOS升级版本后音量监听失效

import audio from '@ohos.multimedia.audio'; 
let audioVolumeManager = audio.getAudioManager() .getVolumeManager() 
  .on('volumeChange', (volumeEvent: audio.VolumeEvent) => { 
    console.info(`VolumeType of stream: ${volumeEvent.volumeType} `); 
    console.info(`Volume level: ${volumeEvent.volume} `); 
    console.info(`Whether to updateUI: ${volumeEvent.updateUi} `); 
  }); 
@Entry 
@Component 
struct ImageExample2 { 
  @State message: string = '音量监听'; 
  build() { 
    Column({ space: 50 }) { 
      Text(this.message) 
        .width(200) 
        .height(200) 
    } 
  } 
}