How to run code even if the app is closed

Can an flutter app still run code even if the app is closed? I am trying to build an application that notifies a user even if the app is closed. Hoping for answers. TIA.

Solution

By default you would have to integrate your background service on a platform specific way.

But I found this package that handles the native integration mostly for you: flutter_background_service.

final service = FlutterBackgroundService();
  await service.configure(
    androidConfiguration: AndroidConfiguration(
      // this will executed when app is in foreground or background in separated isolate
      onStart: onStart,

      // auto start service
      autoStart: true,
      isForegroundMode: true,
    ),
    iosConfiguration: IosConfiguration(
      // auto start service
      autoStart: true,

      // this will executed when app is in foreground in separated isolate
      onForeground: onStart,

      // you have to enable background fetch capability on xcode project
      onBackground: onIosBackground,
    ),
  );
  service.startService();

Code snippet taken from the package example here.

How to add the package to your project:

Open your pubspec.yaml file
Add flutter_background_service: ^2.4.3 to your dependency section
Run flutter pub get