stop method
Stop playback and release resources.
The default implementation (which may be overridden) updates playbackState by setting the processing state to AudioProcessingState.idle which disables the system notification.
Implementation
@override
Future<void> stop() async {
playbackState.add(playbackState.nvalue!
.copyWith(processingState: AudioProcessingState.idle));
await playbackState.firstWhere(
(state) => state.processingState == AudioProcessingState.idle);
}