App crashing - RuntimeException: getParameters failed (empty parameters)

[joakimmag]

The app crashes when navigating away from the scanner page, then back to the scanner page. Also when changing the orientation by rotating the device a few times. I'm using FreshMVVM as an MVVM framework if that is relevant.

Usage:

<Grid>
    <zxing:ZXingScannerView x:Name="ScannerView"
        Result="{Binding ScanResult, Mode=OneWayToSource}"
        ScanResultCommand="{Binding ProcessBarcodeCommand}"
        IsScanning="{Binding IsScanning}"
        IsAnalyzing="{Binding IsAnalyzing}" />
    <zxing:ZXingDefaultOverlay x:Name="ScannerOverlay"
        TopText="Hold your phone up to the QR code"
        BottomText="Scanning will happen automatically"
        ShowFlashButton="True"/>

Full stack trace: https://hastebin.com/ulequfucim.sql

05-23 13:35:13.757 E/mono-rt (24409): [ERROR] FATAL UNHANDLED EXCEPTION: Java.Lang.RuntimeException: getParameters failed (empty parameters)
05-23 13:35:13.757 E/mono-rt (24409):   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <f32579baafc1404fa37ba3ec1abdc0bd>:0 
05-23 13:35:13.757 E/mono-rt (24409):   at Java.Interop.JniEnvironment+InstanceMethods.CallObjectMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x00069] in <09bf3e262b934ffab2ba01f9fc7fd54d>:0 
05-23 13:35:13.757 E/mono-rt (24409):   at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeVirtualObjectMethod (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x0002a] in <09bf3e262b934ffab2ba01f9fc7fd54d>:0 
05-23 13:35:13.757 E/mono-rt (24409):   at Android.Hardware.Camera.GetParameters () [0x0000a] in <25661073a35344a89f215a4cf81af37c>:0 
05-23 13:35:13.757 E/mono-rt (24409):   at ZXing.Mobile.CameraAccess.CameraController.ApplyCameraSettings () [0x00033] in <819b29aa6d91462699e19a679be55a44>:0 
05-23 13:35:13.757 E/mono-rt (24409):   at ZXing.Mobile.CameraAccess.CameraController.RefreshCamera () [0x00010] in <819b29aa6d91462699e19a679be55a44>:0 
05-23 13:35:13.757 E/mono-rt (24409):   at ZXing.Mobile.CameraAccess.CameraAnalyzer.RefreshCamera () [0x00001] in <819b29aa6d91462699e19a679be55a44>:0 
05-23 13:35:13.757 E/mono-rt (24409):   at ZXing.Mobile.ZXingSurfaceView+<OnWindowFocusChanged>d__29.MoveNext () [0x0008f] in <819b29aa6d91462699e19a679be55a44>:0 
05-23 13:35:13.757 E/mono-rt (24409): --- End of stack trace from previous location where exception was thrown ---

[bensafeag]

Java.Lang.RuntimeException: getParameters failed (empty parameters) encountered after a successful scan, navigation change, and another successful scan. Xamarin Forms

[hponaganti]

Observing same on Android

[davidbuckleyni]

Did @hponaganti @bensafeag manage to solve this just getting the exact same app failed QA testing because of it strange it only happens after the 3 x scan. Using Xamrian Forms 4.2.0.709249 Zxing .mobile .forms 2.4.1

09-28 15:37:54.285 D/AppCenterCrashes( 8983): Saving uncaught exception.
09-28 15:37:54.319 D/AppCenterCrashes( 8983): Saved JSON content for ingestion into /data/user/0/com.companyname.FuelStockApp/files/error/8dcf8224-5249-44dd-bf2a-be930577dd06.json
09-28 15:37:54.360 D/AppCenterCrashes( 8983): Saved Throwable as is for client side inspection in /data/user/0/com.companyname.FuelStockApp/files/error/8dcf8224-5249-44dd-bf2a-be930577dd06.throwable throwable:
09-28 15:37:54.360 D/AppCenterCrashes( 8983): java.lang.RuntimeException: getParameters failed (empty parameters)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.hardware.Camera.native_getParameters(Native Method)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.hardware.Camera.getParameters(Camera.java:2189)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at md5bb098716dd46c8e113564e6b42b7cde9.ZXingSurfaceView.n_onWindowFocusChanged(Native Method)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at md5bb098716dd46c8e113564e6b42b7cde9.ZXingSurfaceView.onWindowFocusChanged(ZXingSurfaceView.java:76)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.View.dispatchWindowFocusChanged(View.java:12891)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewRootImpl.handleWindowFocusChanged(ViewRootImpl.java:2811)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewRootImpl.access$1100(ViewRootImpl.java:174)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:4518)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.os.Handler.dispatchMessage(Handler.java:112)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.os.Looper.loop(Looper.java:216)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at android.app.ActivityThread.main(ActivityThread.java:7625)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at java.lang.reflect.Method.invoke(Native Method)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)
09-28 15:37:54.360 D/AppCenterCrashes( 8983): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987)
09-28 15:37:54.369 D/Mono ( 8983): DllImport searching in: '__Internal' ('(null)').
09-28 15:37:54.369 D/Mono ( 8983): Searching for 'java_interop_jnienv_throw'.
09-28 15:37:54.369 D/Mono ( 8983): Probing 'java_interop_jnienv_throw'.
09-28 15:37:54.370 D/Mono ( 8983): Found as 'java_interop_jnienv_throw'.
Java.Lang.RuntimeException: ''

09-28 15:37:59.887 E/mono-rt ( 8983): [ERROR] FATAL UNHANDLED EXCEPTION: Java.Lang.RuntimeException: getParameters failed (empty parameters)
09-28 15:37:59.887 E/mono-rt ( 8983): at Java.Interop.JniEnvironment+InstanceMethods.CallObjectMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x00069] in :0
09-28 15:37:59.887 E/mono-rt ( 8983): at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeVirtualObjectMethod (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x0002a] in :0
09-28 15:37:59.887 E/mono-rt ( 8983): at Android.Hardware.Camera.GetParameters () [0x0000a] in <3d3cf2a3639e4422aea8bb417e71ff8d>:0
09-28 15:37:59.887 E/mono-rt ( 8983): at ZXing.Mobile.CameraAccess.CameraController.ApplyCameraSettings () [0x00033] in <819b29aa6d91462699e19a679be55a44>:0
09-28 15:37:59.887 E/mono-rt ( 8983): at ZXing.Mobile.CameraAccess.CameraController.RefreshCamera () [0x00010] in <819b29aa6d91462699e19a679be55a44>:0
09-28 15:37:59.887 E/mono-rt ( 8983): at ZXing.Mobile.CameraAccess.CameraAnalyzer.RefreshCamera () [0x00001] in <819b29aa6d91462699e19a679be55a44>:0
09-28 15:37:59.887 E/mono-rt ( 8983): at ZXing.Mobile.ZXingSurfaceView.OnWindowFocusChanged (System.Boolean hasWindowFocus) [0x0008f] in <819b29aa6d91462699e19a679be55a44>:0
09-28 15:37:59.887 E/mono-rt ( 8983): at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.41(intptr,intptr)
09-28 15:37:59.887 E/mono-rt ( 8983): at (wrapper native-to-managed) Android.Runtime.DynamicMethodNameCounter.41(intptr,intptr)
09-28 15:37:59.887 E/mono-rt ( 8983): --- End of stack trace from previous location where exception was thrown ---
09-28 15:37:59.887 E/mono-rt ( 8983):
09-28 15:37:59.887 E/mono-rt ( 8983): at Java.Interop.JniEnvironment+InstanceMethods.CallObjectMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x00069] in :0
09-28 15:37:59.887 E/mono-rt ( 8983): at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeVirtualObjectMethod (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x0002a] in :0
09-28 15:37:59.887 E/mono-rt ( 8983): at Java.Lang.Throwable.get_Message () [0x0000a] in <3d3cf2a3639e4422aea8bb417e71ff8d>:0
09-28 15:37:59.887 E/mono-rt ( 8983): --- End of managed Java.Lang.RuntimeException stack trace ---
09-28 15:37:59.887 E/mono-rt ( 8983): java.lang.RuntimeException: getParameters failed (empty parameters)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.hardware.Camera.native_getParameters(Native Method)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.hardware.Camera.getParameters(Camera.java:2189)
09-28 15:37:59.887 E/mono-rt ( 8983): at md5bb098716dd46c8e113564e6b42b7cde9.ZXingSurfaceView.n_onWindowFocusChanged(Native Method)
09-28 15:37:59.887 E/mono-rt ( 8983): at md5bb098716dd46c8e113564e6b42b7cde9.ZXingSurfaceView.onWindowFocusChanged(ZXingSurfaceView.java:76)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.View.dispatchWindowFocusChanged(View.java:12891)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1465)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewRootImpl.handleWindowFocusChanged(ViewRootImpl.java:2811)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewRootImpl.access$1100(ViewRootImpl.java:174)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:4518)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.os.Handler.dispatchMessage(Handler.java:112)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.os.Looper.loop(Looper.java:216)
09-28 15:37:59.887 E/mono-rt ( 8983): at android.app.ActivityThread.ma

[Redth]

Thanks for reporting this issue! Unforunately it took me way too long to respond 😭. Sorry, I apologize! Recently the source code for this project was completely refactored to modernize it. Many PR's were included in this effort, and many bugs were hopefully fixed. Please try out the latest 3.x series of NuGet packages (currently in prerelease). To try and make the project more maintainable in my spare time going forward, I've decided to close all existing issues to start with a clean slate. If you're still experiencing this issue on the newest version, please open a new issue with as much detail as possible. Thank you for your patience and understanding! Happy scanning!

[roomanalikhan]

Thanks for reporting this issue! Unforunately it took me way too long to respond 😭. Sorry, I apologize! Recently the source code for this project was completely refactored to modernize it. Many PR's were included in this effort, and many bugs were hopefully fixed. Please try out the latest 3.x series of NuGet packages (currently in prerelease). To try and make the project more maintainable in my spare time going forward, I've decided to close all existing issues to start with a clean slate. If you're still experiencing this issue on the newest version, please open a new issue with as much detail as possible. Thank you for your patience and understanding! Happy scanning!

The issue still exists in v3.0.0-beta5 (pre release) as well.

[chris-krogsystems]

I'm seeing this on v2.4.1. If you have a successful scan, set IsAnalyzing to false, navigate away from the scan page, then return and set IsAnalyzing to true again, then the camera window freezes. Tilting the phone to trigger a redraw causes the "getParameters() failed" error and the app crashes.

I was able to work around this by resetting Content for the ContentView control that the ZXingScannerView is part of; i.e. { var tempContent = Content; Content = null; Content = tempContent; }, based on a comment I saw in another thread. I do this within the OnAppearing call and it seems to work reliably.

[gceaser]

I'm seeing this on v2.4.1. If you have a successful scan, set IsAnalyzing to false, navigate away from the scan page, then return and set IsAnalyzing to true again, then the camera window freezes. Tilting the phone to trigger a redraw causes the "getParameters() failed" error and the app crashes.

I was able to work around this by resetting Content for the ContentView control that the ZXingScannerView is part of; i.e. { var tempContent = Content; Content = null; Content = tempContent; }, based on a comment I saw in another thread. I do this within the OnAppearing call and it seems to work reliably.

Where in the OnAppearing did you add this code? Here is what I put in mine and it did not seem to help. I am assuming I have the code in the wrong place.

     protected async override void OnAppearing()
        {
            try
            {
                await NavHelper.ShowProcessingPopUp();
                base.OnAppearing();
                var tempContent = Content; 
                Content = null; 
                Content = tempContent;
                await NavHelper.HideProcessingPopUp();

            }
            catch (Exception ex)
            {
                App.ProcessException(ex);
            }    
        }

[chris-krogsystems]

I'm seeing this on v2.4.1. If you have a successful scan, set IsAnalyzing to false, navigate away from the scan page, then return and set IsAnalyzing to true again, then the camera window freezes. Tilting the phone to trigger a redraw causes the "getParameters() failed" error and the app crashes.
I was able to work around this by resetting Content for the ContentView control that the ZXingScannerView is part of; i.e. { var tempContent = Content; Content = null; Content = tempContent; }, based on a comment I saw in another thread. I do this within the OnAppearing call and it seems to work reliably.

Where in the OnAppearing did you add this code? Here is what I put in mine and it did not seem to help. I am assuming I have the code in the wrong place.

     protected async override void OnAppearing()
        {
            try
            {
                await NavHelper.ShowProcessingPopUp();
                base.OnAppearing();
                var tempContent = Content; 
                Content = null; 
                Content = tempContent;
                await NavHelper.HideProcessingPopUp();

            }
            catch (Exception ex)
            {
                App.ProcessException(ex);
            }    
        }

This looks similar to mine. The only significant difference I see is that mine is wrapped in Device.BeginInvokeOnMainThread(), which shouldn't be necessary anyways in OnAppearing.

        base.OnAppearing();

        Device.BeginInvokeOnMainThread(() => BarcodeScanner.ResetScanning());

BarcodeScanner is a custom control. The ResetScanning function is just

    public void ResetScanning()
    {
        ScanningEnabled = !TapToScan;
    }

where ScanningEnabled is a property for the custom control. In the switch for my OnPropertyChanged I have:

            case nameof(ScanningEnabled):
                var tempContent = Content;
                Content = null;
                Content = tempContent;
                BottomBar.IsVisible = TapToScan && !ScanningEnabled;
                CancelPanel.IsVisible = TapToScan && ScanningEnabled;
                StartScanningButton.IsVisible = TapToScan && !ScanningEnabled;
                if (Scanner != null)
                {
                    Scanner.IsAnalyzing = ScanningEnabled;

                    Scanner.OnScanResult -= Scanner_OnScanResult;

                    if (ScanningEnabled)
                        Scanner.OnScanResult += Scanner_OnScanResult;
                }
                break;

Hope that helps.

[zubair1995]

Still facing this issue in Android 10.0

[MVanEester]

also still facing this issue...

Android 11.0 R
ZXing.Net.Mobile 2.4.1

.xaml

<zxing:ZXingScannerView x:Name="Scan"
                                    ScaleX="1.3"
                                    OnScanResult="Scan_OnScanResult"
                                    IsAnalyzing="True"
                                    IsScanning="True"/>

Almost Always with a ScannerView in the xaml.

ScannerPages work fine.

[SteRompen]

Has anyone found a solution yet? I am looking to solve this error for a couple of hours right now... maybe @MVanEester ?

[jhonatansantos61]

Unfortunately I'm having the same problem. I noticed that there are times when the reading is done very fast and it already causes the exception. Does anyone know how to solve?