Nullpointer exception for cameraInstance

[aaqibkhan]

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.journeyapps.barcodescanner.camera.CameraInstance.setSurfaceHolder(android.view.SurfaceHolder)' on a null object reference
       at com.journeyapps.barcodescanner.CameraPreview.startCameraPreview(CameraPreview.java:472)
       at com.journeyapps.barcodescanner.CameraPreview.startPreviewIfReady(CameraPreview.java:320)
       at com.journeyapps.barcodescanner.CameraPreview.access$200(CameraPreview.java:48)
       at com.journeyapps.barcodescanner.CameraPreview$1.surfaceChanged(CameraPreview.java:130)
       at android.view.SurfaceView.updateWindow(SurfaceView.java:590)
       at android.view.SurfaceView.setFrame(SurfaceView.java:300)
       at android.view.View.layout(View.java:15610)
       at com.journeyapps.barcodescanner.CameraPreview.onLayout(CameraPreview.java:337)
       at android.view.View.layout(View.java:15614)
       at android.view.ViewGroup.layout(ViewGroup.java:4968)
       at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1076)
       at android.view.View.layout(View.java:15614)
       at android.view.ViewGroup.layout(ViewGroup.java:4968)
       at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
       at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
       at android.widget.ScrollView.onLayout(ScrollView.java:1505)
       at android.view.View.layout(View.java:15614)
       at android.view.ViewGroup.layout(ViewGroup.java:4968)

[rkistner]

Can you please give some more info? See CONTRIBUTING.md.

[aaqibkhan]

@rkistner
I am using these versions

compile 'com.journeyapps:zxing-android-embedded:3.0.2@aar'
compile 'com.google.zxing:core:3.2.0'

Device: Moto E2
Android version: 5.0.2

I am not able to reproduce the error. I have used the library many times with above version and it never crashed. Just this one time I got this error.

[aaqibkhan]

I am calling resume() in activity's onResume() and pause()' inonPause()`.
Using continuous decoding

[rkistner]

Thanks, I'll see if I can find the cause.

On Sun, Dec 6, 2015 at 11:24 AM, aaqibkhan notifications@github.com wrote:

I am calling resume() in activity's onResume() and pause()' inonPause()`.
Using continuous decoding

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#108 (comment)
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[Sebosam]

Hello,
I think it's because rotation. When u rotate on clean android cameraPreview started faster before finishing stopPreview and then u have only black screen and bug:). It crashed probably in CameraSurface#setPreview. When u minimize app and take it back it start working.
Sorry for language:)

[aaqibkhan]

any progress on this?

[rkistner]

Sorry, no progress yet. Will see if I can do something before the next release.

[matyj]

any tips or workaround? it's very important for me right now, lib is good but unuseful for me with this error ;<

[Sebosam]

I just inject other activity onPause it isnt pretty but works for me. E.g touch to Wake up;)

[matyj]

@Sebosam , what do you mean? i don't understand you at all. in which on pause? what injection do you mean?

[Sebosam]

@matyj Make a second activity to reset ur captureActivty. When u call onPause in captureActivity start the second activity to reset zxing camera and come back to it onTouch event for example(like touch to wake up).

[rkistner]

@matyj Can you give more details on how you reproduce this issue and what exactly happens? My initial impression was that this issue was fairly rare and low-impact.

I'm working on a potential fix now, should have it ready soon.