15.Compose 使用CameraX

01. Compose 可组合组件之Row And Column 02. Compose 可组合组件之 属性 modifier 03. Compose 可组合组件之Card 图片 04. Compose 字体 05. Compose State 06. Compose SnackBar 07. Compose List 08. Compose ConstrainLayout 09. Compose Button 10. Compose CheckBox 11. Compose 对于复杂界面的尝试 12. Compose 之原生xml布局加入Compose代码 13. Compose 之Compose代码插入xml布局 14. Compose 之简易朋友圈列表 15. Compose 使用CameraX

class ComposeCameraXActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            SimpleCameraPreview()
        }
    }

    @Composable
    fun SimpleCameraPreview() {
        val lifecycleOwner = LocalLifecycleOwner.current
        val context = LocalContext.current
        val cameraProviderFuture = remember { ProcessCameraProvider.getInstance(context) }
        AndroidView(
            factory = { ctx ->
                val preview = 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 executor = ContextCompat.getMainExecutor(ctx)
                cameraProviderFuture.addListener({
                    val cameraProvider = cameraProviderFuture.get()
                    bindPreview(
                        lifecycleOwner,
                        preview,
                        cameraProvider,
                    )
                }, executor)
                preview
            },
            modifier = Modifier.fillMaxSize(),
        )
    }

    private fun bindPreview(
        lifecycleOwner: LifecycleOwner,
        previewView: PreviewView,
        cameraProvider: ProcessCameraProvider
    ) {
        val preview = androidx.camera.core.Preview.Builder().build()
        val cameraSelector: CameraSelector = CameraSelector.Builder()
            .requireLensFacing(CameraSelector.LENS_FACING_BACK)
            .build()
        preview.setSurfaceProvider(previewView.surfaceProvider)
        val camera = cameraProvider.bindToLifecycle(lifecycleOwner, cameraSelector, preview)
//        camera.cameraControl.enableTorch(true)
        camera.cameraControl.cancelFocusAndMetering()
//        camera.cameraControl.setZoomRatio(0.5f)
//        camera.cameraInfo.

    }
}