HarmonyOS如何获取手机当前音量

import { BusinessError } from '@ohos.base'; 
 
audioVolumeGroupManager.getVolume(audio.AudioVolumeType.MEDIA, (err: BusinessError, value: number) => { 
  if (err) { 
    console.error(`Failed to obtain the volume. ${err}`); 
    return; 
  } 
  console.info('Callback invoked to indicate that the volume is obtained.'); 
});
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