在AudioVolumeGroupManager中提供了管理麦克风状态的方法。下面对核心开发步骤做个简单介绍。

1、主要开发步骤

a）创建audioVolumeGroupManager对象。

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

let audioVolumeGroupManager;
async function loadVolumeGroupManager() { //创建audioVolumeGroupManager对象
  const groupid = audio.DEFAULT_VOLUME_GROUP_ID;
  audioVolumeGroupManager = await audio.getAudioManager().getVolumeManager().getVolumeGroupManager(groupid);
  console.info('audioVolumeGroupManager create success.');
}

b）调用on('micStateChange')监听麦克风状态变化，当麦克风静音状态发生变化时将通知应用。

目前此订阅接口在单进程多AudioManager实例的使用场景下，仅最后一个实例的订阅生效，其他实例的订阅会被覆盖（即使最后一个实例没有进行订阅），因此推荐使用单一AudioManager实例进行开发。

async function on() {   //监听麦克风状态变化
  audioVolumeGroupManager.on('micStateChange', (micStateChange) => {
    console.info(`Current microphone status is: ${micStateChange.mute} `);
  });
}

c）调用isMicrophoneMute查询麦克风当前静音状态，返回true为静音，false为非静音。

async function isMicrophoneMute() { //查询麦克风是否静音
  await audioVolumeGroupManager.isMicrophoneMute().then((value) => {
    console.info(`isMicrophoneMute is: ${value}.`);
  });
}

d）根据查询结果的实际情况，调用setMicrophoneMute设置麦克风静音状态，入参输入true为静音，false为非静音。

async function setMicrophoneMuteTrue() { //设置麦克风静音，入参为true
  await audioVolumeGroupManager.setMicrophoneMute(true).then(() => {
    console.info('setMicrophoneMute to mute.');
  });
}
async function setMicrophoneMuteFalse() { //取消麦克风静音，入参为false
  await audioVolumeGroupManager.setMicrophoneMute(false).then(() => {
    console.info('setMicrophoneMute to not mute.');
  });
}

2、Demo

一个示例，从设置麦克风静音到取消麦克风静音的过程。

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

@Entry
@Component
struct AudioVolumeGroup {
 private audioVolumeGroupManager: audio.AudioVolumeGroupManager;

  async loadVolumeGroupManager() {
    const groupid = audio.DEFAULT_VOLUME_GROUP_ID;
    this.audioVolumeGroupManager = await audio.getAudioManager().getVolumeManager().getVolumeGroupManager(groupid);
    console.info('audioVolumeGroupManager------create-------success.');
  }

  async on() {   //监听麦克风状态变化
    await this.loadVolumeGroupManager();
    this.audioVolumeGroupManager.on('micStateChange', (micStateChange) => {
      console.info(`Current microphone status is: ${micStateChange.mute} `);
    });
  }
  async isMicrophoneMute() { //查询麦克风是否静音
    await this.audioVolumeGroupManager.isMicrophoneMute().then((value) => {
      console.info(`isMicrophoneMute is: ${value}.`);
    });
  }
  async setMicrophoneMuteTrue() { //设置麦克风静音
    await this.loadVolumeGroupManager();
    await this.audioVolumeGroupManager.setMicrophoneMute(true).then(() => {
      console.info('setMicrophoneMute to mute.');
    });
  }
  async setMicrophoneMuteFalse() { //取消麦克风静音
    await this.loadVolumeGroupManager();
    await this.audioVolumeGroupManager.setMicrophoneMute(false).then(() => {
      console.info('setMicrophoneMute to not mute.');
    });
  }
  async test(){
    await this.on();
    await this.isMicrophoneMute();
    await this.setMicrophoneMuteTrue();
    await this.isMicrophoneMute();
    await this.setMicrophoneMuteFalse();
    await this.isMicrophoneMute();
    await this.setMicrophoneMuteTrue();
    await this.isMicrophoneMute();
  }
}