如何在构图中初始化相机

如何解决如何在构图中初始化相机

我想通过撰写androidView来获取相机视图，但是以下代码似乎对我不起作用。

@Composable
fun CameraPreviewScreen() {
    val lifecycleOwner = LifecycleOwnerAmbient.current
    val context = ContextAmbient.current
    val cameraProviderFuture = remember { ProcessCameraProvider.getInstance(context) }
    val previewView = remember { PreviewView(context) }
    AndroidView(viewBlock = { previewView }) {
        cameraProviderFuture.addListener(Runnable {
            val cameraProvider = cameraProviderFuture.get()
            val preview = Preview.Builder().build()
            preview.setSurfaceProvider(it.surfaceProvider)
            val cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA
            try {
                cameraProvider.unbindAll()
                cameraProvider.bindToLifecycle(
                    lifecycleOwner,cameraSelector,preview)
            } catch(exc: Exception) {
                Log.e(TAG,"Use case binding Failed",exc)
            }
        },ContextCompat.getMainExecutor(context))
    }
}

下面的快照。

报告错误。

拒绝权限：不能使用相机
未经相机许可（代码1）无法打开相机“ 0”