vibrator.kt

private lateinit var vibrator: Vibrator

vibrator = getSystemService(Context.VIBRATOR_SERVICE) as Vibrator

private fun vibrate() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        vibrator.vibrate(VibrationEffect.createOneShot(500, VibrationEffect.DEFAULT_AMPLITUDE));
    } else {
        vibrator.vibrate(500);
  }
}