ac2

class MainActivity : AppCompatActivity(), LifecycleOwner {

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

    // Add this after onCreate

    private lateinit var viewFinder: TextureView

    private fun startCamera() {
        // TODO: Implement CameraX operations
    }

    private fun updateTransform() {
        // TODO: Implement camera viewfinder transformations
    }

    /**
     * Process result from permission request dialog box, has the request
     * been granted? If yes, start Camera. Otherwise display a toast
     */
    override fun onRequestPermissionsResult(
        requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
        if (requestCode == REQUEST_CODE_PERMISSIONS) {
            if (allPermissionsGranted()) {
                viewFinder.post { startCamera() }
            } else {
                Toast.makeText(this,
                    "Permissions not granted by the user.", 
                    Toast.LENGTH_SHORT).show()
                finish()
            }
        }
    }

    /**
     * Check if all permission specified in the manifest have been granted
     */
    private fun allPermissionsGranted() = REQUIRED_PERMISSIONS.all {
        ContextCompat.checkSelfPermission(
               baseContext, it) == PackageManager.PERMISSION_GRANTED
    }
}