qr_code_scanner/lib/src/lifecycle_event_handler.dart

import 'package:flutter/material.dart';
import 'package:flutter/foundation.dart';

class LifecycleEventHandler extends WidgetsBindingObserver {
  LifecycleEventHandler({
    required this.resumeCallBack,
  });

  late final AsyncCallback resumeCallBack;

  @override
  Future<void> didChangeAppLifecycleState(AppLifecycleState state) async {
    switch (state) {
      case AppLifecycleState.resumed:
        await resumeCallBack();
        break;
      case AppLifecycleState.inactive:
      case AppLifecycleState.paused:
      case AppLifecycleState.detached:
    }
  }
}