didChangeAppLifecycleState method Null safety

  1. @override
void didChangeAppLifecycleState(
  1. AppLifecycleState state
)
override

Called when the system puts the app in the background or returns the app to the foreground.

An example of implementing this method is provided in the class-level documentation for the WidgetsBindingObserver class.

This method exposes notifications from SystemChannels.lifecycle.

Implementation

@override
void didChangeAppLifecycleState(AppLifecycleState state) {
  switch (state) {
    case AppLifecycleState.resumed:
      update();
      break;
    case AppLifecycleState.detached:
    case AppLifecycleState.inactive:
    case AppLifecycleState.paused:
      // Nothing to do.
  }
}