onExitGeofences method
Get notified when the user exits a Geofence. Call this method before the positioning is started.
Implementation
Future<void> onExitGeofences(OnExitedGeofencesCallback callback) async {
_onExitedGeofencesCallback = callback;
// Install the native listener only when it was explicitly required as it
// supposes a computational costs.
await methodChannel.invokeMethod('geofenceCallbacksRequested');
}