85657
Androidで映像をカメラから録画するだけのアプリをつくっています。  
画面上にカメラからの映像をプレビューし、それを録画するだけのアプリです。  
**録画機能はまだ実装していませんが** MediaRecorderの初期化とプレビュー画面の表示すらできません。なぜでしょうか?

kotlinとjetpack composeを使用していて、Android 12をtargetに開発しています。

エラーログ:

```

    E/AndroidRuntime: FATAL EXCEPTION: main
        Process: com.example.simpledriverwatcher, PID: 26536
        java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
            at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:558)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
         Caused by: java.lang.reflect.InvocationTargetException
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003) 
         Caused by: android.hardware.camera2.CameraAccessException: CAMERA_DISABLED (1): validateClientPermissionsLocked:1227: Caller "com.example.simpledriverwatcher" (PID 10392, UID 26536) cannot open camera "0" from background (calling UID 10392 proc state 20)
            at android.hardware.camera2.CameraManager.throwAsPublicException(CameraManager.java:1179)
            at android.hardware.camera2.CameraManager.openCameraDeviceUserAsync(CameraManager.java:616)
            at android.hardware.camera2.CameraManager.openCameraForUid(CameraManager.java:866)
            at android.hardware.camera2.CameraManager.openCameraForUid(CameraManager.java:887)
            at android.hardware.camera2.CameraManager.openCamera(CameraManager.java:725)
            at com.example.simpledriverwatcher.MainActivityKt$CameraPreview$1.invoke(MainActivity.kt:101)
            at com.example.simpledriverwatcher.MainActivityKt$CameraPreview$1.invoke(MainActivity.kt:78)
            at androidx.compose.ui.viewinterop.ViewFactoryHolder.setFactory(AndroidView.android.kt:144)
            at androidx.compose.ui.viewinterop.AndroidView_androidKt$AndroidView$1.invoke(AndroidView.android.kt:90)
            at androidx.compose.ui.viewinterop.AndroidView_androidKt$AndroidView$1.invoke(AndroidView.android.kt:88)
            at androidx.compose.ui.viewinterop.AndroidView_androidKt$AndroidView$$inlined$ComposeNode$1.invoke(Composables.kt:212)
            at androidx.compose.runtime.ComposerImpl$createNode$2.invoke(Composer.kt:1362)
            at androidx.compose.runtime.ComposerImpl$createNode$2.invoke(Composer.kt:1360)
            at androidx.compose.runtime.ComposerImpl$recordInsert$2.invoke(Composer.kt:2763)
            at androidx.compose.runtime.ComposerImpl$recordInsert$2.invoke(Composer.kt:2760)
            at androidx.compose.runtime.CompositionImpl.applyChanges(Composition.kt:629)
            at androidx.compose.runtime.Recomposer.composeInitial$runtime_release(Recomposer.kt:733)
            at androidx.compose.runtime.CompositionImpl.setContent(Composition.kt:432)
            at androidx.compose.ui.platform.WrappedComposition$setContent$1.invoke(Wrapper.android.kt:144)
            at androidx.compose.ui.platform.WrappedComposition$setContent$1.invoke(Wrapper.android.kt:135)
            at androidx.compose.ui.platform.AndroidComposeView.setOnViewTreeOwnersAvailable(AndroidComposeView.android.kt:727)
            at androidx.compose.ui.platform.WrappedComposition.setContent(Wrapper.android.kt:135)
            at androidx.compose.ui.platform.WrappedComposition.onStateChanged(Wrapper.android.kt:187)
            at androidx.lifecycle.LifecycleRegistry$ObserverWithState.dispatchEvent(LifecycleRegistry.java:354)
            at androidx.lifecycle.LifecycleRegistry.addObserver(LifecycleRegistry.java:196)
            at androidx.compose.ui.platform.WrappedComposition$setContent$1.invoke(Wrapper.android.kt:142)
            at androidx.compose.ui.platform.WrappedComposition$setContent$1.invoke(Wrapper.android.kt:135)
            at androidx.compose.ui.platform.AndroidComposeView.onAttachedToWindow(AndroidComposeView.android.kt:814)
            at android.view.View.dispatchAttachedToWindow(View.java:20753)
            at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3490)
            at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3497)
            at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3497)
            at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3497)
            at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3497)
            at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2613)
            at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:2126)
            at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:8649)
    E/AndroidRuntime:     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1037)
            at android.view.Choreographer.doCallbacks(Choreographer.java:845)
            at android.view.Choreographer.doFrame(Choreographer.java:780)
            at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1022)
            at android.os.Handler.handleCallback(Handler.java:938)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loopOnce(Looper.java:201)
            at android.os.Looper.loop(Looper.java:288)
            at android.app.ActivityThread.main(ActivityThread.java:7842)
                ... 3 more
         Caused by: android.os.ServiceSpecificException: validateClientPermissionsLocked:1227: Caller "com.example.simpledriverwatcher" (PID 10392, UID 26536) cannot open camera "0" from background (calling UID 10392 proc state 20) (code 6)
            at android.os.Parcel.createExceptionOrNull(Parcel.java:2439)
            at android.os.Parcel.createException(Parcel.java:2409)
            at android.os.Parcel.readException(Parcel.java:2392)
            at android.os.Parcel.readException(Parcel.java:2334)
            at android.hardware.ICameraService$Stub$Proxy.connectDevice(ICameraService.java:669)
            at android.hardware.camera2.CameraManager.openCameraDeviceUserAsync(CameraManager.java:596)
                ... 47 more
    I/Process: Sending signal. PID: 26536 SIG: 9
    
```

コード1:

```

    class MainActivity : ComponentActivity() {
        override fun onCreate(savedInstanceState: Bundle?) {
    
            super.onCreate(savedInstanceState)
            var mr: MediaRecorder = MediaRecorder()
            mr.reset()
            setContent {
                SimpleDriverWatcherTheme {
                    // A surface container using the 'background' color from the theme
                    Surface(color = MaterialTheme.colors.background) {
                        Box(modifier = Modifier.fillMaxSize()) {
                            var rec_state = remember { mutableStateOf(false)}
                            CameraPreview(mr, rec_state)
                            Button(
                                enabled = true,
                                onClick = {
                                    rec_state.value = !rec_state.value
                                },
                                modifier = Modifier
                                    .padding(0.dp, 0.dp, 0.dp, 30.dp)
                                    .size(80.dp)
                                    .align(Alignment.BottomCenter),
                                shape = CircleShape
                            ) {
                                Icon(Icons.Default.FiberManualRecord, null, modifier = Modifier.size(50.dp), tint = Color.Red)
                            }
                        }
                    }
                }
            }
        }
    }
    
    @Composable
    fun Greeting(name: String) {
        Text(text = "Hello $name!")
    }
    
    @Composable
    fun CameraPreview(mediaRecorder: MediaRecorder, stat: State<Boolean>) {
        AndroidView(modifier = Modifier.fillMaxSize(), factory = { ctx ->
            android.view.SurfaceView(ctx).apply {
                var cam_m: CameraManager?
                var curr_cam_id: String = ""
                var sysservice = ctx.getSystemService(CAMERA_SERVICE)
                cam_m = sysservice as CameraManager
                var cam_ids = cam_m.cameraIdList
                for (i in cam_ids) {
                    Log.d("Hello", "World")
                    val cam_char = cam_m.getCameraCharacteristics(i)
                    val lens_facing = cam_char.get(CameraCharacteristics.LENS_FACING)
                    if (lens_facing == CameraMetadata.LENS_FACING_BACK) {
                        curr_cam_id = i
                        break
                    }
                }
                if (curr_cam_id == "") {
                    Log.d("Camera", "Camera does not exist")
    
                }
    
                when {
                    context.checkSelfPermission(Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED -> {
                        cam_m!!.openCamera(curr_cam_id, MyCameraStatecallback(context, this, mediaRecorder), null)
                    }
                    else -> {
                        requestPermissions(ctx as Activity, arrayOf(Manifest.permission.CAMERA), 449)
                    }
                }
    
            }
        })
    }
    
    
    
    class MyCameraStatecallback(val context: Context, val surfaceView: android.view.SurfaceView, val mr: MediaRecorder) : CameraDevice.StateCallback() {
        override fun onOpened(camera: CameraDevice) {
            InitMediaRecorder(context, mr)
            mr.prepare()
            val opc = OutputConfiguration(surfaceView.holder.surface)
            val opc2 = OutputConfiguration(mr.surface)
            val lopc = listOf(opc, opc2)
            val cam_cap_thread = HandlerThread("CameraCaptureThread")
            cam_cap_thread.start()
            camera.createCaptureSession(
                SessionConfiguration(
                    SessionConfiguration.SESSION_REGULAR,
                    lopc,
                    context.mainExecutor,
                    myCaptureStatecallback(context, surfaceView, mediaRecorder = mr)
                )
            )
    
        }
    
        override fun onDisconnected(camera: CameraDevice) {
            Toast.makeText(context, "Camera Disconnected", Toast.LENGTH_LONG)
        }
    
        override fun onError(camera: CameraDevice, error: Int) {
            Log.e("Error", "CameraDevice.StateCallbackError")
            Toast.makeText(context, "camera error", Toast.LENGTH_LONG)
        }
    }
    
    
    class myCaptureStatecallback(val context: Context, val previewSurfaceView: SurfaceView, val mediaRecorder: MediaRecorder) : CameraCaptureSession.StateCallback() {
        override fun onReady(session: CameraCaptureSession) {
            var camdev = session.device as CameraDevice
            var cap_req_builder = camdev.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW)
            cap_req_builder.addTarget(previewSurfaceView.holder.surface)
            cap_req_builder.addTarget(mediaRecorder.surface)
    
    
            //cap_req_builder.addTarget(record_surface)
            session.setRepeatingRequest(
                cap_req_builder.build(),
                null,
                null
            )
        }
    
        override fun onConfigured(session: CameraCaptureSession) {
    
        }
    
        override fun onConfigureFailed(session: CameraCaptureSession) {
            session.close()
        }
    }
    
    
    @Preview(showBackground = true)
    @Composable
    fun DefaultPreview() {
        SimpleDriverWatcherTheme {
                Button(enabled = true, onClick = {}, modifier = Modifier.size(100.dp), shape= CircleShape) {
                    Text("Button")
                }
              //  CameraPreview()
        }
    }
    
```

コード2:

```

    fun InitMediaRecorder(context: Context, mr: MediaRecorder) : MediaRecorder {
        var res : String?
        var num : Int = 0
        var uri =MediaStore.Video.Media.EXTERNAL_CONTENT_URI
        var values = ContentValues()
        val resolver = context.contentResolver
        val p = Pattern.compile("""^SimpleDriverWatch\d+.mp4$""")
        val projection = arrayOf(MediaStore.Video.Media.DISPLAY_NAME)
        val sortorder = "${MediaStore.Video.Media.DISPLAY_NAME} DESC"
        val query = context.contentResolver.query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
        projection,
        null,
        null,
        sortorder)
    
        query?.use {
            val display_name_column = it.getColumnIndexOrThrow(MediaStore.Video.Media.DISPLAY_NAME)
            while (it.moveToNext()) {
                var dn = it.getString(display_name_column)
                var m = p.matcher(dn)
                if (m.matches()) {
                    var file_num = m.group(1).toInt()
                    if (file_num > num) {
                        num = file_num
                    }
                }
            }
        }
    
        num++
        values.put(MediaStore.Video.Media.DISPLAY_NAME, "DriverWatcherVideo" + num.toString() + ".mp4")
        values.put(MediaStore.Video.Media.MIME_TYPE, "video/mp4")
        val output_url = resolver.insert(uri, values)
        val ofd = resolver.openFileDescriptor(output_url!!, "w")
        mr.reset()
        mr.setVideoSource(MediaRecorder.VideoSource.CAMERA)
        mr.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4)
        mr.setVideoEncoder(MediaRecorder.VideoEncoder.H264)
        mr.setVideoSize(720, 720)
        mr.setOutputFile(ofd!!.fileDescriptor)
        return@InitMediaRecorder mr
    }
    
```
CC BY-SA 4.0
2021-12-19T14:36:34.317
85231
2022-01-13T00:06:27.063
2022-01-13T00:06:27.063
3060
5246
question
android kotlin camera
Androidで映像録画アプリでエラー
```

    Caused by: android.hardware.camera2.CameraAccessException: CAMERA_DISABLED (1): validateClientPermissionsLocked:1227:~~~
    
```

より、アプリにカメラパーミッションが与えられていないのではないでしょうか
CC BY-SA 4.0
2022-01-12T17:20:07.020
85657
2022-01-12T17:20:07.020
50861
85231
answer