[안드로이드 kotlin] The camera device has encountered a serious error

<에러 로그>

D/Camera2CameraImpl: CameraDevice.onError(): 0 failed with ERROR_CAMERA_DISABLED while in OPENED state. Will attempt recovering from error.
E/Camera2CameraImpl: Error observed on open (or opening) camera device 0: ERROR_CAMERA_DISABLED closing camera.
D/Camera2CameraImpl: {Camera@5184eed[id=0]} Transitioning camera internal state: OPENED --> CLOSING
D/CameraStateRegistry: Recalculating open cameras:
    Camera                                       State                 
    -------------------------------------------------------------------
    Camera@5184eed[id=0]                         CLOSING               
    Camera@a518e88[id=2]                         UNKNOWN               
    Camera@cb50d6e[id=1]                         UNKNOWN               
    -------------------------------------------------------------------
    Open count: 1 (Max allowed: 1)
D/Camera2CameraImpl: {Camera@5184eed[id=0]} Resetting Capture Session
D/StreamStateObserver: Update Preview stream state to IDLE
E/CameraCaptureSession: Session 0: Exception while stopping repeating: 
    android.hardware.camera2.CameraAccessException: CAMERA_ERROR (3): The camera device has encountered a serious error
        at android.hardware.camera2.impl.CameraDeviceImpl.checkIfCameraClosedOrInError(CameraDeviceImpl.java:2553)
        at android.hardware.camera2.impl.CameraDeviceImpl.stopRepeating(CameraDeviceImpl.java:1141)
        at android.hardware.camera2.impl.CameraCaptureSessionImpl.close(CameraCaptureSessionImpl.java:526)
        at androidx.camera.camera2.internal.SynchronizedCaptureSessionBaseImpl.close(SynchronizedCaptureSessionBaseImpl.java:435)
        at androidx.camera.camera2.internal.CaptureSession.release(CaptureSession.java:438)
        at androidx.camera.camera2.internal.Camera2CameraImpl.releaseSession(Camera2CameraImpl.java:483)
        at androidx.camera.camera2.internal.Camera2CameraImpl.resetCaptureSession(Camera2CameraImpl.java:1098)
        at androidx.camera.camera2.internal.Camera2CameraImpl.closeCamera(Camera2CameraImpl.java:397)
        at androidx.camera.camera2.internal.Camera2CameraImpl$StateCallback.handleErrorOnOpen(Camera2CameraImpl.java:1482)
        at androidx.camera.camera2.internal.Camera2CameraImpl$StateCallback.onError(Camera2CameraImpl.java:1446)
        at androidx.camera.camera2.internal.CameraDeviceStateCallbacks$ComboDeviceStateCallback.onError(CameraDeviceStateCallbacks.java:119)
        at android.hardware.camera2.impl.CameraDeviceImpl$CameraDeviceCallbacks.notifyError(CameraDeviceImpl.java:2042)
        at android.hardware.camera2.impl.CameraDeviceImpl$CameraDeviceCallbacks.lambda$Sm85frAzwGZVMAK-NE_gwckYXVQ(Unknown Source:0)
        at android.hardware.camera2.impl.-$$Lambda$CameraDeviceImpl$CameraDeviceCallbacks$Sm85frAzwGZVMAK-NE_gwckYXVQ.accept(Unknown Source:8)
        at com.android.internal.util.function.pooled.PooledLambdaImpl.doInvoke(PooledLambdaImpl.java:271)
        at com.android.internal.util.function.pooled.PooledLambdaImpl.invoke(PooledLambdaImpl.java:195)
        at com.android.internal.util.function.pooled.OmniFunction.run(OmniFunction.java:86)
        at androidx.camera.core.impl.utils.executor.SequentialExecutor$1.run(SequentialExecutor.java:109)
        at androidx.camera.core.impl.utils.executor.SequentialExecutor$QueueWorker.workOnQueue(SequentialExecutor.java:229)
        at androidx.camera.core.impl.utils.executor.SequentialExecutor$QueueWorker.run(SequentialExecutor.java:171)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:919)
D/Camera2CameraImpl: {Camera@5184eed[id=0]} Releasing session in state CLOSING
D/CaptureSession: CameraCaptureSession.onClosed()
D/DeferrableSurface: use count-1,  useCount=0 closed=false androidx.camera.core.impl.ImmediateSurface@5c075a6
D/DeferrableSurface: Surface no longer in use[total_surfaces=2, used_surfaces=1](androidx.camera.core.impl.ImmediateSurface@5c075a6}
D/DeferrableSurface: use count-1,  useCount=0 closed=true androidx.camera.core.SurfaceRequest$2@a11aa0b
D/DeferrableSurface: Surface no longer in use[total_surfaces=2, used_surfaces=0](androidx.camera.core.SurfaceRequest$2@a11aa0b}
D/DeferrableSurface: Surface terminated[total_surfaces=1, used_surfaces=0](androidx.camera.core.SurfaceRequest$2@a11aa0b}

 

error 이미지 1

error 이미지 2 - 위 에러가 나타난 후 실행됨

 

카메라 기능이 필요해서 camerax 를 사용하고 custom dialog 를 만들어서 나타나도록 만들었습니다. 사진 촬영은 잘 되지만 사진 촬영 후에 화면을  끄거 시간이 잠시 지나면(약 30초~1분 사이) 위와 같은 에러 로그가 나타났습니다.

물론 자동으로 문제가 있는 내용을 파악해서 open 되어있는 카메라를 자동으로 close 해주는것 같긴 하지만 위 에러에서도 나타나있듯이 serious error 일수도 있으니까 안나타나도록 하는게 좋을것 같습니다.

 

문제가 나타나게 된 원인은 dialog 가 종료 되어 카메라를 더이상 하용하지 않는데 camera device 가 계속 open 되어있는것 인듯 싶었습니다.

그래서 dialog 를 dismiss 하기 전에 shutdown 해주는 코드를 추가하였습니다.

 

기본적인 camerax 사용 방법은 android developer sample을 참조하시면 될 것 같습니다.

lateinit var cameraExecutor: ExecutorService
val lifeCycleOwner: MyLifecycleOwner

...

imageCapture?.takePicture(
                    outputOptions,
                    ContextCompat.getMainExecutor(context),
                    object : ImageCapture.OnImageSavedCallback {
                        override fun onImageSaved(outputFileResults: ImageCapture.OutputFileResults) {
                        ...
                        
                        // 여기에 아래 두 줄을 추가
                        cameraExecutor.shutdown()
                        lifeCycleOwner.stop()
                        }

(카메라 종료 코드 추가)

 

camerax 의  전체 코드 중 촬영하는 부분만 표시하였습니다.

저장한 이미지를 callback 받는 지점안에 onImageSaved() method 안에 cameraExecutor.shutdown() 와 lifeCycleOwner.stop() 을 사용하면 에러가 나타나지 않습니다.