在HarmonyOS开发中 音频管理-监听音量变化无反应，怎么解决？

Question

在使用音频管理监听音量变化时，发现没法监听到，我的代码如下：

import audio from '@ohos.multimedia.audio'; 
let audioManager = audio.getAudioManager(); 
let audioVolumeManager = audioManager.getVolumeManager(); 
 
audioVolumeManager.on('volumeChange', (volumeEvent) => { 
});

Answer 1

建议在入口初始化时，使用以下写法测试，测试音频监听正常。

@Component 
struct Index { 
  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} `); 
    }); 
  }

Answer 2

import audio from '@ohos.multimedia.audio';

let audioManager = audio.getAudioManager();
let audioVolumeManager = audioManager.getVolumeManager();

audioVolumeManager.on('volumeChange', (volumeEvent) => {
    console.log('Volume changed:', volumeEvent);
});