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Microphone capture is shared by all channels, so input device events are Engine-global events. Register them with RTCEngine.setRtcMicDeviceEvent(...); pass null to unbind. If you only care about some events, extend RTCMicDeviceSimpleEvent.

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onMicDeviceListChanged(devices)

The microphone input devices available on the system changed, for example when a wired headset, Bluetooth, or USB microphone is plugged in or removed. The parameter is the full device list after the change.

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onMicDeviceInvalid(deviceId, reason)

The input device currently capturing became invalid. The SDK tries to fall back to the system default input and rebuild capture; deviceId is the device handle for this connection, and reason is why it became invalid. For input device fields, see Types; for querying and switching devices, see LocalMicTrack.