Code for toggling the flash mode in cameraX sample application

ControlView.kt

private fun toggleFlash() {
    when (flashMode) {
        FlashMode.FLASH_MODE_AUTO -> {
            flashMode =
                FlashMode.FLASH_MODE_OFF
            ivFlash.setImageResource(R.drawable.ic_baseline_flash_off_24)
        }
        FlashMode.FLASH_MODE_ON -> {
            flashMode =
                FlashMode.FLASH_MODE_AUTO
            ivFlash.setImageResource(R.drawable.ic_baseline_flash_auto_24)
        }
        FlashMode.FLASH_MODE_OFF -> {
            flashMode =
                FlashMode.FLASH_MODE_ON
            ivFlash.setImageResource(R.drawable.ic_baseline_flash_on_24)
        }
    }
    listener?.toggleFlash(flashMode)
}