onContactEvent abstract method Null safety

void onContactEvent(
  1. ChatMultiDevicesEvent event,
  2. String username,
  3. String? ext
)

The multi-device event callback of contact.

Param event The event type.

Param username The username.

Param ext The extended Information.

Implementation

void onContactEvent(
  ChatMultiDevicesEvent event,
  String username,
  String? ext,
);