CreateChannel.kt

private const val CHANNEL_ID = "heads_up_alerts"
private const val CHANNEL_NAME = "Heads Up Alerts"

private val notificationManager = NotificationManagerCompat.from(context)

private fun createNotificationChannel() {
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) return

    val channel = NotificationChannel(
        CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH
    ).apply {
        lockscreenVisibility = Notification.VISIBILITY_PUBLIC
    }

    notificationManager.createNotificationChannel(channel)
}