didChangeAppLifecycleState method

  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.

See also:

Implementation

@override
void didChangeAppLifecycleState(AppLifecycleState state) {
  switch (state) {
    case AppLifecycleState.resumed:
      // App is in foreground
      if (_isTracking) _calculateMissedSteps();
      break;
    case AppLifecycleState.paused:
      // App is in background
      _persistSession();
      break;
    case AppLifecycleState.detached:
      // App is killed (not always reliable on iOS)
      break;
    default:
      break;
  }
}