下一集

val next = VideoAds(nextEpisode)
lifecycleScope.launch {
    nextLinear = try { next.format(AdFormat.LINEAR).apply { load() } } catch (e: VideoAdException) { null }
}

// 观众继续看下一集时：
ads.destroy()
ads = next
ads.track(player)     // 播放器现在播放下一集

fun episodeFinished() {
    val ad = postRoll ?: return nextEpisode()
    try {
        ad.show(this)                        // 此时调用 destroy() 会结束它
    } catch (e: VideoAdException) {
        nextEpisode()                        // 没有展示
    }
}

override fun onAdEnded(ad: VideoAd, reason: VideoAd.EndReason) {
    if (ad === postRoll) nextEpisode()
}

private fun nextEpisode() {
    ads.destroy()                            // 在片尾广告的 onAdEnded 之后，绝不在之前
    ads = next
    ads.track(player)
}