didChangeAppLifecycleState method

@override void didChangeAppLifecycleState(AppLifecycleState state)

App Lifecycle Listener

detached -> resumed -| ^ v | inactive paused <- hidden <--|

Implementation

@override
void didChangeAppLifecycleState(AppLifecycleState state) {
  final AppLifecycleState? previousState = _lifecycleState;
  if (state == previousState) {
    // Transitioning to the same state twice doesn't produce any notifications (but also won't actually occur).
    return;
  }
  _lifecycleState = state;
  switch (state) {
    case AppLifecycleState.resumed:
      onResumed();
      break;
    case AppLifecycleState.inactive:
      if (previousState == AppLifecycleState.hidden) {
        onShow();
      } else if (previousState == null ||
          previousState == AppLifecycleState.resumed) {
        onInactive();
      }
      break;
    case AppLifecycleState.hidden:
      if (previousState == AppLifecycleState.paused) {
        onRestart();
      } else if (previousState == null ||
          previousState == AppLifecycleState.inactive) {
        onHidden();
      }
      break;
    case AppLifecycleState.paused:
      if (previousState == null ||
          previousState == AppLifecycleState.hidden) {
        onPaused();
      }
      break;
    case AppLifecycleState.detached:
      onDetached();
      break;
    default:
  }

  // At this point, it can't be null anymore.
  if (_lifecycleState != null) {
    onStateChange(_lifecycleState!);
  }
}