App Crashing After Close Camera

[hohoan]

When I press button EXIT, my app force close. Please help me My Code: Future scanBarcodeNormal() async { String barcodeScanRes; try { barcodeScanRes = await FlutterBarcodeScanner.scanBarcode( "#ff6666", "EXIT", true, ScanMode.BARCODE); if (barcodeScanRes != "-1") { print(barcodeScanRes); } } on PlatformException { barcodeScanRes = 'Failed to get platform version.'; } if (!mounted) return; setState(() { }); } Here my error: E/AndroidRuntime(21975): FATAL EXCEPTION: main E/AndroidRuntime(21975): Process: abc.test, PID: 21975 E/AndroidRuntime(21975): java.lang.RuntimeException: Unable to destroy activity {abc.test/com.amolg.flutterbarcodescanner.BarcodeCaptureActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Thread$State java.lang.Thread.getState()' on a null object reference E/AndroidRuntime(21975): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4167) E/AndroidRuntime(21975): at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:4185) E/AndroidRuntime(21975): at android.app.ActivityThread.-wrap6(ActivityThread.java) E/AndroidRuntime(21975): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1521) E/AndroidRuntime(21975): at android.os.Handler.dispatchMessage(Handler.java:102) E/AndroidRuntime(21975): at android.os.Looper.loop(Looper.java:154) E/AndroidRuntime(21975): at android.app.ActivityThread.main(ActivityThread.java:6077) E/AndroidRuntime(21975): at java.lang.reflect.Method.invoke(Native Method) E/AndroidRuntime(21975): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866) E/AndroidRuntime(21975): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756) E/AndroidRuntime(21975): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Thread$State java.lang.Thread.getState()' on a null object reference E/AndroidRuntime(21975): at com.amolg.flutterbarcodescanner.camera.CameraSource$FrameProcessingRunnable.release(CameraSource.java:967) E/AndroidRuntime(21975): at com.amolg.flutterbarcodescanner.camera.CameraSource.release(CameraSource.java:273) E/AndroidRuntime(21975): at com.amolg.flutterbarcodescanner.camera.CameraSourcePreview.release(CameraSourcePreview.java:84) E/AndroidRuntime(21975): at com.amolg.flutterbarcodescanner.BarcodeCaptureActivity.onDestroy(BarcodeCaptureActivity.java:266) E/AndroidRuntime(21975): at android.app.Activity.performDestroy(Activity.java:6864) E/AndroidRuntime(21975): at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1153) E/AndroidRuntime(21975): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4154) E/AndroidRuntime(21975): ... 9 more

[Kiraneki]

Same problem here... You find some solution? And this problem start with me recently, after make some updates on flutter framework (up to 1.22.3) and .gradle from android package. I guess that gradle version isn't directly related to the bug, but the flutter new version and perhaps the new Android Studio 4.1 have some connection.

[xinoxapps]

Same problem over here.

[xinoxapps]

Quick solution for CameraSource.java

        @SuppressLint("Assert")
        void release() {
            assert (mProcessingThread == null || mProcessingThread.getState() == State.TERMINATED);
            if (mDetector != null) {
                mDetector.release();
                mDetector = null;
            }
        }

[Kiraneki]

Quick solution for CameraSource.java

        @SuppressLint("Assert")
        void release() {
            assert (mProcessingThread == null || mProcessingThread.getState() == State.TERMINATED);
            if (mDetector != null) {
                mDetector.release();
                mDetector = null;
            }
        }

Thank you @xinoxapps ! This provisional solution works fine here. And i can complement this help for someone have minimal poblems to find the function release into the CameraSource.java: be careful, because this release function is into FrameProcessingRunnable class (have another release function on the begin of the file that remets to the release of resouces).

[rohitvedula17]

Same problem for me. I'm new to Flutter can you please let me know how to fix the issue.

[Kiraneki]

Same problem for me. I'm new to Flutter can you please let me know how to fix the issue.

@rohitvedula17 , you can make this changes in external libraries path from your project. External Libraries > Flutter Pluggins > flutter_barcode_scanner As image below:

[rohitvedula17]

@Kiraneki This works for me. Thanks for the help and prompt response. Sorry I Saw the message today, hence the late reply. @xinoxapps Thanks for your solution.

[hohoan]

thanks for your solution @xinoxapps , @Kiraneki

[ronpetit]

This should not be closed as the solution is not yet implemented on the repository code @hohoan

Thanks for you solution also

[KaungZawHtet]

This should not be closed as the solution is not yet implemented on the repository code

Yes, plz fix in main repository and release new version

[mindhalt]

When this will be fixed?

[PabloReszczynski]

@mindhalt You may have better luck trying a fork of this project since the maintainer seems to have abandoned this issue.

[DitoXD]

can someone fix this whole package with nullsafety? or at least empart some knowledge on how to do it? I will myself if I could learn how... really need the android and iOS version of OCR to work too