flutter_barcode_scanner: com.package.MainActivity cannot be cast to io.flutter.embedding.android.FlutterActivity

Because of some of my Plugins, i have to use FlutterFragmentActivity instead of FlutterActivity.

Unfortunately the Plugin is not working then.

Error:

E/AndroidRuntime(18103): java.lang.ClassCastException: de.fitasy.MainActivity cannot be cast to io.flutter.embedding.android.FlutterActivity
E/AndroidRuntime(18103): 	at com.amolg.flutterbarcodescanner.FlutterBarcodeScannerPlugin.createPluginSetup(FlutterBarcodeScannerPlugin.java:248)
E/AndroidRuntime(18103): 	at com.amolg.flutterbarcodescanner.FlutterBarcodeScannerPlugin.onAttachedToActivity(FlutterBarcodeScannerPlugin.java:275)
E/AndroidRuntime(18103): 	at io.flutter.embedding.engine.FlutterEnginePluginRegistry.add(FlutterEnginePluginRegistry.java:143)
E/AndroidRuntime(18103): 	at io.flutter.plugins.GeneratedPluginRegistrant.registerWith(GeneratedPluginRegistrant.java:26)
E/AndroidRuntime(18103): 	at de.fitasy.MainActivity.configureFlutterEngine(MainActivity.kt:10)
E/AndroidRuntime(18103): 	at io.flutter.embedding.android.FlutterFragment.configureFlutterEngine(FlutterFragment.java:950)
E/AndroidRuntime(18103): 	at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onAttach(FlutterActivityAndFragmentDelegate.java:181)
E/AndroidRuntime(18103): 	at io.flutter.embedding.android.FlutterFragment.onAttach(FlutterFragment.java:582)
E/AndroidRuntime(18103): 	at androidx.fragment.app.Fragment.performAttach(Fragment.java:2574)
E/AndroidRuntime(18103): 	at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:828)
E/AndroidRuntime(18103): 	at androidx.fragment.app.FragmentTransition.addToFirstInLastOut(FragmentTransition.java:1197)
E/AndroidRuntime(18103): 	at androidx.fragment.app.FragmentTransition.calculateFragments(FragmentTransition.java:1080)
E/AndroidRuntime(18103): 	at androidx.fragment.app.FragmentTransition.startTransitions(FragmentTransition.java:119)
E/AndroidRuntime(18103): 	at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1866)
E/AndroidRuntime(18103): 	at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1824)