kotlin 摄像机镜头面验证失败，现有摄像机

r7xajy2e  于 2023-02-05  发布在  Kotlin
关注(0)|答案(2)|浏览(573)

我试图使用前置摄像头捕捉图片。但我得到错误：-相机镜头面对验证失败，现有的相机。
我也无法得到预览的相机以及。这里是代码：-

@ExperimentalPermissionsApi
class MainActivity : ComponentActivity() {
    @OptIn(ExperimentalCoilApi::class, ExperimentalCoroutinesApi::class)
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            OP2Theme {
                // A surface container using the 'background' color from the theme
                Surface(
                    modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colors.background
                ) {
                    MainContent(Modifier.fillMaxSize())
                }
            }
        }
    }
}

@ExperimentalCoilApi
@ExperimentalCoroutinesApi
@ExperimentalPermissionsApi
@Composable
fun MainContent(modifier: Modifier = Modifier) {
    val emptyImageUri = Uri.parse("file://dev/null")
    var imageUri by remember { mutableStateOf(emptyImageUri) }
    if (imageUri != emptyImageUri) {
        Box(modifier = modifier) {
            Image(
                modifier = Modifier.fillMaxSize(),
                painter = rememberImagePainter(imageUri),
                contentDescription = "Captured image"
            )
            Button(
                modifier = Modifier.align(Alignment.BottomCenter),
                onClick = {
                    imageUri = emptyImageUri
                }
            ) {
                Text("Remove image")
            }
        }
    } else {
        CameraCapture(
            modifier = modifier,
            onImageFile = { file ->
                imageUri = file.toUri()
            }
        )
    }
}

@Composable
fun Greeting(name: String) {
    Text(text = "Hello $name!")
}

@Preview(showBackground = true)
@Composable
fun DefaultPreview() {
    OP2Theme {
        Greeting("Android")
    }
}

这里是相机预览的代码：-

@Composable
fun CameraPreview(
    modifier: Modifier = Modifier,
    scaleType: PreviewView.ScaleType = PreviewView.ScaleType.FILL_CENTER,
    onUseCase: (UseCase) -> Unit = { }
) {
    AndroidView(
        modifier = modifier,
        factory = { context ->
            val previewView = PreviewView(context).apply {
                this.scaleType = scaleType
                layoutParams = ViewGroup.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT,
                    ViewGroup.LayoutParams.MATCH_PARENT
                )
            }
            onUseCase(
                Preview.Builder()
                    .build()
                    .also {
                        it.setSurfaceProvider(previewView.surfaceProvider)
                    }
            )
            previewView
        }
    )
}

这是我的代码相机捕捉：

@ExperimentalPermissionsApi
@ExperimentalCoroutinesApi
@Composable
fun CameraCapture(
    modifier: Modifier = Modifier,
    cameraSelector: CameraSelector = CameraSelector.DEFAULT_FRONT_CAMERA,
    onImageFile: (File) -> Unit = { }
) {
    val context = LocalContext.current
    Permission(
        permission = Manifest.permission.CAMERA,
        rationale = "You said you wanted a picture, so I'm going to have to ask for permission.",
        permissionNotAvailableContent = {
            Column(modifier) {
                Text("O noes! No Camera!")
                Spacer(modifier = Modifier.height(8.dp))
                Button(
                    onClick = {
                        context.startActivity(
                            Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS).apply {
                                data = Uri.fromParts("package", context.packageName, null)
                            }
                        )
                    }
                ) {
                    Text("Open Settings")
                }
            }
        }
    ) {
        Box(modifier = modifier) {
            val lifecycleOwner = LocalLifecycleOwner.current
            val coroutineScope = rememberCoroutineScope()
            var previewUseCase by remember { mutableStateOf<UseCase>(Preview.Builder().build()) }
            val imageCaptureUseCase by remember {
                mutableStateOf(
                    ImageCapture.Builder()
                        .setCaptureMode(CAPTURE_MODE_MAXIMIZE_QUALITY)
                        .build()
                )
            }
            Box {
                CameraPreview(
                    modifier = Modifier.fillMaxSize(),
                    onUseCase = {
                        previewUseCase = it
                    }
                )
                Button(
                    modifier = Modifier
                        .wrapContentSize()
                        .padding(16.dp)
                        .align(Alignment.BottomCenter),
                    onClick = {
                        coroutineScope.launch {
                            imageCaptureUseCase.takePicture(context.executor).let {
                                onImageFile(it)
                            }
                        }
                    }
                ) {
                    Text("Click!")
                }
            }
            LaunchedEffect(previewUseCase) {
                val cameraProvider = context.getCameraProvider()
                try {
                    // Must unbind the use-cases before rebinding them.
                    cameraProvider.unbindAll()
                    cameraProvider.bindToLifecycle(
                        lifecycleOwner, cameraSelector, previewUseCase, imageCaptureUseCase
                    )
                } catch (ex: Exception) {
                    Log.e("CameraCapture", "Failed to bind camera use cases", ex)
                }
            }
        }
    }
}

下面是我的权限代码：-

@ExperimentalPermissionsApi
@Composable
fun Permission(
    permission: String = android.Manifest.permission.CAMERA,
    rationale: String = "This permission is important for this app. Please grant the permission.",
    permissionNotAvailableContent: @Composable () -> Unit = { },
    content: @Composable () -> Unit = { }
) {
    val permissionState = rememberPermissionState(permission)
    PermissionRequired(
        permissionState = permissionState,
        permissionNotGrantedContent = {
            Rationale(
                text = rationale,
                onRequestPermission = { permissionState.launchPermissionRequest() }
            )
        },
        permissionNotAvailableContent = permissionNotAvailableContent,
        content = content
    )
}

@Composable
private fun Rationale(
    text: String,
    onRequestPermission: () -> Unit
) {
    AlertDialog(
        onDismissRequest = { /* Don't */ },
        title = {
            Text(text = "Permission request")
        },
        text = {
            Text(text)
        },
        confirmButton = {
            Button(onClick = onRequestPermission) {
                Text("Ok")
            }
        }
    )
}

Build.gradle中camerax的依赖关系：-

//Camera
def camerax_version = "1.2.1"
//noinspection GradleDependency
implementation "androidx.camera:camera-camera2:$camerax_version"
implementation "androidx.camera:camera-lifecycle:$camerax_version"
implementation "androidx.camera:camera-view:1.3.0-alpha03"

清单.xml中的权限：-

<uses-feature android:name="android.hardware.camera" />
<uses-permission android:name="android.permission.CAMERA" />

这些是我在使用此代码时遇到的错误。：-

E/CameraValidator: Camera LensFacing verification failed, existing cameras: [Camera@af090c1[id=0], Camera@743c9c0[id=1]]
    E/CameraX: The device might underreport the amount of the cameras. Finish the initialize task since we are already reaching the maximum number of retries.
    E/CameraCapture: Failed to bind camera use cases
        java.lang.IllegalArgumentException: Provided camera selector unable to resolve a camera for the given use case
            at androidx.camera.lifecycle.ProcessCameraProvider.bindToLifecycle(ProcessCameraProvider.java:479)
            at androidx.camera.lifecycle.ProcessCameraProvider.bindToLifecycle(ProcessCameraProvider.java:366)
            at com.op2.files.CameraCaptureKt$CameraCapture$3$1$2.invokeSuspend(CameraCapture.kt:110)
            at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
            at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
            at androidx.compose.ui.platform.AndroidUiDispatcher.performTrampolineDispatch(AndroidUiDispatcher.android.kt:81)
            at androidx.compose.ui.platform.AndroidUiDispatcher.access$performTrampolineDispatch(AndroidUiDispatcher.android.kt:41)
            at androidx.compose.ui.platform.AndroidUiDispatcher$dispatchCallback$1.run(AndroidUiDispatcher.android.kt:57)
            at android.os.Handler.handleCallback(Handler.java:938)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loopOnce(Looper.java:226)
            at android.os.Looper.loop(Looper.java:313)
            at android.app.ActivityThread.main(ActivityThread.java:8751)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1135)
    E/CameraCapture: Failed to bind camera use cases
        java.lang.IllegalArgumentException: Provided camera selector unable to resolve a camera for the given use case
            at androidx.camera.lifecycle.ProcessCameraProvider.bindToLifecycle(ProcessCameraProvider.java:479)
            at androidx.camera.lifecycle.ProcessCameraProvider.bindToLifecycle(ProcessCameraProvider.java:366)
            at com.op2.files.CameraCaptureKt$CameraCapture$3$1$2.invokeSuspend(CameraCapture.kt:110)
            at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
            at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
            at androidx.compose.ui.platform.AndroidUiDispatcher.performTrampolineDispatch(AndroidUiDispatcher.android.kt:81)
            at androidx.compose.ui.platform.AndroidUiDispatcher.access$performTrampolineDispatch(AndroidUiDispatcher.android.kt:41)
            at androidx.compose.ui.platform.AndroidUiDispatcher$dispatchCallback$1.run(AndroidUiDispatcher.android.kt:57)
            at android.os.Handler.handleCallback(Handler.java:938)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loopOnce(Looper.java:226)
            at android.os.Looper.loop(Looper.java:313)
            at android.app.ActivityThread.main(ActivityThread.java:8751)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1135)
    I/ViewRootImpl@9e9624a[MainActivity]: ViewPostIme pointer 0
    I/ViewRootImpl@9e9624a[MainActivity]: ViewPostIme pointer 1
    D/ImageCapture: takePictureWithNode
    E/TakePicture: Image capture failed
        androidx.camera.core.ImageCaptureException: Not bound to a valid Camera [ImageCapture:androidx.camera.core.ImageCapture-b7455703-bb88-40b0-b3da-acfd633286f6]
            at androidx.camera.core.ImageCapture.sendInvalidCameraError(ImageCapture.java:1725)
            at androidx.camera.core.ImageCapture.takePictureWithNode(ImageCapture.java:1706)
            at androidx.camera.core.ImageCapture.takePicture(ImageCapture.java:918)
            at com.op2.files.ExtKt.takePicture(ext.kt:43)
            at com.op2.files.ExtKt$takePicture$1.invokeSuspend(Unknown Source:13)
            at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
            at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
            at androidx.compose.ui.platform.AndroidUiDispatcher.performTrampolineDispatch(AndroidUiDispatcher.android.kt:81)
            at androidx.compose.ui.platform.AndroidUiDispatcher.access$performTrampolineDispatch(AndroidUiDispatcher.android.kt:41)
            at androidx.compose.ui.platform.AndroidUiDispatcher$dispatchCallback$1.run(AndroidUiDispatcher.android.kt:57)
            at android.os.Handler.handleCallback(Handler.java:938)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loopOnce(Looper.java:226)
            at android.os.Looper.loop(Looper.java:313)
            at android.app.ActivityThread.main(ActivityThread.java:8751)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1135)
    E/AndroidRuntime: FATAL EXCEPTION: main
        Process: com.op2, PID: 5120
        androidx.camera.core.ImageCaptureException: Not bound to a valid Camera [ImageCapture:androidx.camera.core.ImageCapture-b7455703-bb88-40b0-b3da-acfd633286f6]
            at androidx.camera.core.ImageCapture.sendInvalidCameraError(ImageCapture.java:1725)
            at androidx.camera.core.ImageCapture.takePictureWithNode(ImageCapture.java:1706)
            at androidx.camera.core.ImageCapture.takePicture(ImageCapture.java:918)
            at com.op2.files.ExtKt.takePicture(ext.kt:43)
            at com.op2.files.ExtKt$takePicture$1.invokeSuspend(Unknown Source:13)
            at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
            at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
            at androidx.compose.ui.platform.AndroidUiDispatcher.performTrampolineDispatch(AndroidUiDispatcher.android.kt:81)
            at androidx.compose.ui.platform.AndroidUiDispatcher.access$performTrampolineDispatch(AndroidUiDispatcher.android.kt:41)
            at androidx.compose.ui.platform.AndroidUiDispatcher$dispatchCallback$1.run(AndroidUiDispatcher.android.kt:57)
            at android.os.Handler.handleCallback(Handler.java:938)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loopOnce(Looper.java:226)
            at android.os.Looper.loop(Looper.java:313)
            at android.app.ActivityThread.main(ActivityThread.java:8751)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1135)
            Suppressed: kotlinx.coroutines.DiagnosticCoroutineContextException: [androidx.compose.ui.platform.MotionDurationScaleImpl@6183a1, androidx.compose.runtime.BroadcastFrameClock@f2649c6, StandaloneCoroutine{Cancelling}@2ebed87, AndroidUiDispatcher@e3d74b4]
kotlin

2条答案

按热度按时间
iih3973s

iih3973s1#

您正在使用不同版本的camerax_version，请使用相同版本。
在build. gradle中进行以下更改。：-

//Camera
def camerax_version = "1.2.1"
//noinspection GradleDependency
implementation "androidx.camera:camera-camera2:$camerax_version"
implementation "androidx.camera:camera-lifecycle:$camerax_version"
implementation "androidx.camera:camera-view:$camerax_version"
赞(0）分享  回复(0）举报  2023-02-05
axr492tv

axr492tv2#

该错误可能与缺少摄像机权限、摄像机配置或硬件问题有关。
要解决此问题，您可以先检查您在AndroidManifest.xml文件中是否具有正确的相机权限。请确保您已包含以下权限：

<uses-permission android:name="android.permission.CAMERA" />

您还应该检查您正在使用的设备是否有前置摄像头。有些设备没有前置摄像头，尝试访问它将导致错误。

赞(0）分享  回复(0）举报  2023-02-05
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