Android easy camera permission

build.gradle

AndroidX camera dependencies, should be added to build.gradle dependencies {} section, like usual libraries

implementation 'androidx.camera:camera-view:1.1.0'
implementation 'androidx.camera:camera-core:1.1.0'
implementation 'androidx.camera:camera-camera2:1.1.0'
implementation 'androidx.camera:camera-lifecycle:1.1.0'

Camera.kt

Simple AndroidX camera preview, uses AndroidView to insert View as Compose element

@Composable
fun CameraPreview(
    modifier: Modifier = Modifier,
    cameraSelector: CameraSelector = CameraSelector.DEFAULT_BACK_CAMERA,
    scaleType: PreviewView.ScaleType = PreviewView.ScaleType.FILL_CENTER,
) {
    val lifecycleOwner = LocalLifecycleOwner.current
    AndroidView(
        modifier = modifier,
        factory = { context ->
            val previewView = PreviewView(context).apply {
                this.scaleType = scaleType
                layoutParams = ViewGroup.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT,
                    ViewGroup.LayoutParams.MATCH_PARENT
                )
                // Preview is incorrectly scaled in Compose on some devices without this
                implementationMode = PreviewView.ImplementationMode.COMPATIBLE
            }

            val cameraProviderFuture = ProcessCameraProvider.getInstance(context)

            cameraProviderFuture.addListener({
                val cameraProvider = cameraProviderFuture.get()

                // Preview
                val preview = Preview.Builder()
                    .build()
                    .also {
                        it.setSurfaceProvider(previewView.surfaceProvider)
                    }

                try {
                    // Must unbind the use-cases before rebinding them.
                    cameraProvider.unbindAll()

                    cameraProvider.bindToLifecycle(
                        lifecycleOwner, cameraSelector, preview
                    )
                } catch (exc: Exception) {
                    exc.printStackTrace()
                }
            }, ContextCompat.getMainExecutor(context))
            previewView
        }
    )
}

MainActivity.kt

Checking permission on activity start, if not granted asking for it, otherwise starting CameraPreview()

class MainActivity : ComponentActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            Content()
        }
    }

    @Composable
    private fun Content() {
        CameraTestTheme {
            Box(
                modifier = Modifier
                    .fillMaxSize()
                    .background(MaterialTheme.colors.background)
            ) {
                var granted by remember {
                    mutableStateOf(PackageManager.PERMISSION_GRANTED == checkSelfPermission(Manifest.permission.CAMERA))
                }

                if (granted) {
                    // CAMERA PERMISSION GRANTED, CAN WORK WITH CAMERA
                    CameraPreview()
                } else {
                    val launcher =
                        rememberLauncherForActivityResult(ActivityResultContracts.RequestPermission()) {
                            granted = it
                        }
                    SideEffect {
                        launcher.launch(Manifest.permission.CAMERA)
                    }
                }
            }
        }
    }
}