addGroupManagerListener method Null safety

void addGroupManagerListener(
  1. ChatGroupManagerListener listener
)

Registers a group manager listener.

The registered listener needs to be used together with {@link #removeGroupManagerListener(ChatGroupManagerListener)}.

Param listener The group manager listener to be registered.

Implementation

void addGroupManagerListener(ChatGroupManagerListener listener) {
  _listeners.remove(listener);
  _listeners.add(listener);
}