//Android Result API用

 implementation 'androidx.activity:activity-ktx:1.4.0'

private fun preview(){

    Intent(MediaStore.ACTION_IMAGE_CAPTURE).also {

        intent -> intent.resolveActivity(packageManager)?.also {

　　　// カメラ起動

          //  startActivityForResult(intent,REQUEST_PREVIEW) // startActivityForResultは非推奨

            startActivityResult.launch(intent)

        }

    }

}

private final val startActivityResult=registerForActivityResult(ActivityResultContracts.StartActivityForResult()){

    result:ActivityResult ->

    if(result.resultCode==Activity.RESULT_OK){

        // カメラで取得した画像をImageViewに表示する

        val imageBitmap=result.data?.extras?.get("data") as Bitmap

        binding.imageView.setImageBitmap(imageBitmap)

    }

}