addGroupChangeListener method Null safety

void addGroupChangeListener(
  1. EMGroupEventListener listener
)

Registers a group event listener.

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

Param listener The group event listener to be registered.

Implementation

void addGroupChangeListener(EMGroupEventListener listener) {
  _groupChangeListeners.add(listener);
}