ActivityNormal.kt

class Activity {
  fun selectImage() {
        if (checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
            getImage()
        } else {
            askPermission()
        }
    }

    private fun askPermission() {
        ActivityCompat.requestPermissions(activity, arrayOf<String>(Manifest.permission.WRITE_EXTERNAL_STORAGE), 1)
    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            // Treat request granted
        } else {
            // Treat request denied
        }
    }
}