Creating/Updating channels

Channels.kt

val existingChannel = queryChannels().firstOrNull {
    it.internalProviderId == category.id.toString()
}
val channelBuilder = when (existingChannel) {
    null -> Channel.Builder()
    else -> Channel.Builder(existingChannel)
}
val channel = channelBuilder
    .setType(TvContractCompat.Channels.TYPE_PREVIEW)
    .setDisplayName(category.title)
    .setInternalProviderId(category.id.toString())
    .setAppLinkIntentUri("content://channelsample.com/category/${category.id}".toUri())
    .build()