Android Question CameraEx Android Version "8.1" Application Crash

[Ertan]

[Class] CameraEx - Extends the camera library functionality

Example based on B4XPages: https://www.b4x.com/android/forum/threads/b4x-b4xpages-barcode-reader.120417/#content CameraEx class wraps the Camera object and using reflection and other code it extends its functionality. CameraEx class requires Android 2.3+ and depends on Camera library v2.20+...

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Hello there,

In Erel's Camera example, I discovered a problem with the Camera example. Maybe it's a common problem, but I haven't found the necessary solution yet.

You can reveal this problem as follows.

If you upload the APK of the project at https://appetize.io/ and select "Android 8.1" and Confirm Camera Permission after opening the application, the application crashes. I could not do this on my local phones. I could not make this mistake.

But users get this error in my application on Google Play.


cameraexclass._camera_ready

java.lang.NullPointerException:
  at anywheresoftware.b4a.agraham.reflection.Reflection.runmethod (Reflection.java:205)
  at anywheresoftware.b4a.agraham.reflection.Reflection.RunMethod (Reflection.java:802)
  at **.cameraexclass._camera_ready (cameraexclass.java:117)
  at java.lang.reflect.Method.invoke (Native Method)
  at anywheresoftware.b4a.BA.raiseEvent2 (BA.java:213)
  at anywheresoftware.b4a.BA.raiseEvent (BA.java:193)
  at anywheresoftware.b4a.objects.CameraW$2$1.run (CameraW.java:139)
  at android.os.Handler.handleCallback (Handler.java:888)
  at android.os.Handler.dispatchMessage (Handler.java:100)
  at android.os.Looper.loop (Looper.java:213)
  at android.app.ActivityThread.main (ActivityThread.java:8178)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:513)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1101)

My library is up to date.

CameraExClass = version 1.30
Camera = version 2.20

The codes are the same in my own project.

I would be glad if you could help.

 

[Ertan]

I still haven't found any information about this library. My infrastructure will change if I update to Camera2 library. Can you update about this library?

 

[Erel]

The appetize service is not really relevant in this case. You need to test on real hardware.

Implement crashlytics. You will get more information.

 

[Ertan]

The appetize service is not really relevant in this case. You need to test on real hardware.

Implement crashlytics. You will get more information.

Hello erel,
I did what they said.

Detailed error like this.

The application is asking for permission. After giving permission, the application crashes. This error varies from device to device. While it happens on one device, it doesn't happen on the other device.

I would be glad if you help me. Thank you so much.

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference
       at anywheresoftware.b4a.agraham.reflection.Reflection.runmethod(Reflection.java:205)
       at anywheresoftware.b4a.agraham.reflection.Reflection.RunMethod(Reflection.java:802)
       at packetname.cameraexclass._camera_ready(cameraexclass.java:119)
       at java.lang.reflect.Method.invoke(Method.java)
       at anywheresoftware.b4a.BA.raiseEvent2(BA.java:213)
       at anywheresoftware.b4a.BA.raiseEvent(BA.java:193)
       at anywheresoftware.b4a.objects.CameraW$2$1.run(CameraW.java:139)
       at android.os.Handler.handleCallback(Handler.java:790)
       at android.os.Handler.dispatchMessage(Handler.java:99)
       at android.os.Looper.loop(Looper.java:164)
       at android.app.ActivityThread.main(ActivityThread.java:6494)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

 

[Erel]

You are testing the camera on virtual devices. Why????????????

 

[Ertan]

You are testing the camera on virtual devices. Why????????????

You are right . I tested it on the virtual device in the first post. These are the errors that appear in the Google Console, and these are real devices.

2nd)

I'm viewing these incoming alerts on the Google Play Console. I think of them as real users. I did not encounter this problem on real phones, but the errors seem the same as in my Google Play Console reports.

It happened 8 days ago and these are real devices. (if not google's bots)

The reason I tested this on the virtual device is;

There is NO DIFFERENCE BETWEEN ERROR LOGS between Real device and Virtual device.[/QUOTE]

 

[Erel]

Based on the error, it failed to open the camera. You can check whether nativeCam = Null in Camera_Ready. It wasn't needed in the past so it is a bit strange.