app crash when application ForegroundMode

[Fuzelmomin]

E/AndroidRuntime(15670): FATAL EXCEPTION: main E/AndroidRuntime(15670): Process: com.example, PID: 15670 E/AndroidRuntime(15670): java.lang.RuntimeException: Unable to destroy activity {com.example/com.example.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.lifecycle.Lifecycle.removeObserver(androidx.lifecycle.LifecycleObserver)' on a null object reference E/AndroidRuntime(15670): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4648) E/AndroidRuntime(15670): at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:4666) E/AndroidRuntime(15670): at android.app.ActivityThread.-wrap5(Unknown Source:0) E/AndroidRuntime(15670): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794) E/AndroidRuntime(15670): at android.os.Handler.dispatchMessage(Handler.java:106) E/AndroidRuntime(15670): at android.os.Looper.loop(Looper.java:164) E/AndroidRuntime(15670): at android.app.ActivityThread.main(ActivityThread.java:7025) E/AndroidRuntime(15670): at java.lang.reflect.Method.invoke(Native Method) E/AndroidRuntime(15670): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:441) E/AndroidRuntime(15670): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408) E/AndroidRuntime(15670): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.lifecycle.Lifecycle.removeObserver(androidx.lifecycle.LifecycleObserver)' on a null object reference E/AndroidRuntime(15670): at com.amolg.flutterbarcodescanner.FlutterBarcodeScannerPlugin.clearPluginSetup(FlutterBarcodeScannerPlugin.java:295) E/AndroidRuntime(15670): at com.amolg.flutterbarcodescanner.FlutterBarcodeScannerPlugin.onDetachedFromActivity(FlutterBarcodeScannerPlugin.java:285) E/AndroidRuntime(15670): at io.flutter.embedding.engine.FlutterEngineConnectionRegistry.detachFromActivity(FlutterEngineConnectionRegistry.java:392) E/AndroidRuntime(15670): at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onDetach(FlutterActivityAndFragmentDelegate.java:653) E/AndroidRuntime(15670): at io.flutter.embedding.android.FlutterFragment.onDetach(FlutterFragment.java:844) E/AndroidRuntime(15670): at androidx.fragment.app.Fragment.performDetach(Fragment.java:3229) E/AndroidRuntime(15670): at androidx.fragment.app.FragmentStateManager.detach(FragmentStateManager.java:812) E/AndroidRuntime(15670): at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:353) E/AndroidRuntime(15670): at androidx.fragment.app.SpecialEffectsController$FragmentStateManagerOperation.complete(SpecialEffectsController.java:742) E/AndroidRuntime(15670): at androidx.fragment.app.SpecialEffectsController$Operation.cancel(SpecialEffectsController.java:594) E/AndroidRuntime(15670): at androidx.fragment.app.SpecialEffectsController.forceCompleteAllOperations(SpecialEffectsController.java:329) E/AndroidRuntime(15670): at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:3132) E/AndroidRuntime(15670): at androidx.fragment.app.FragmentManager.dispatchDestroy(FragmentManager.java:3107) E/AndroidRuntime(15670): at androidx.fragment.app.FragmentController.dispatchDestroy(FragmentController.java:334) E/AndroidRuntime(15670): at androidx.fragment.app.FragmentActivity.onDestroy(FragmentActivity.java:330) E/AndroidRuntime(15670): at com.example.beta_jellie.MainActivity.onDestroy(MainActivity.kt:163) E/AndroidRuntime(15670): at android.app.Activity.performDestroy(Activity.java:7595) E/AndroidRuntime(15670): at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1257) E/AndroidRuntime(15670): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4635) E/AndroidRuntime(15670): ... 9 more

[mahdinazmi]

@Fuzelmomin Did you solved it ?

[ekasetiawans]

It seems you are trying to use barcode scanner within the foreground service which is not allowed. Keep in your mind, you will never be able to use any feature that requires an UI.