HarmonyOS AVCastPicker组件的onStateChange事件不会触发？

Question

如题：HarmonyOS AVCastPicker组件的onStateChange事件不会触发？

Answer 1

请参考文档：https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/using-switch-call-devices-V5如果应用想知道设备切换情况，可以监听当前发声设备切换回调。

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

let audioManager = audio.getAudioManager(); // 先创建audiomanager
let audioRoutingManager = audioManager.getRoutingManager(); // 再调用AudioManager的方法创建AudioRoutingManager实例
// 可选监听当前发声设备切换回调
audioRoutingManager.on('preferOutputDeviceChangeForRendererInfo', this.audioRendererInfo, (desc: audio.AudioDeviceDescriptors) => {
  console.info(`device change To : ${desc[0].deviceType}`); // 设备类型
});