Launch a flutter thread as a service which continues after the app has closed.

Hi.

I need some swift and java code to launch a flutter thread as a background process, as well as a normal flutter application.

The flutter function needs to display notifications and is as such:
int main() {
_showNotificatiotn(0,header,message)
}

I'm using the flutter_local_notifications package. This will require some code in Swift and Java to modify the program.

Ideas from https://medium.com/flutter/executing-dart-in-the-background-with-flutter-plugins-and-geofencing-2b3e40a1a124#targetText=Scheduling%20the%20geofencing%20service&targetText=The%20onReceive%20implementation%20is%20simple,the%20GeofencingService%20's%20work%20queue.