问ExoPlayer2如何循环播放视频的一部分/片段

EN

player?.seekTo(2000)

var elapsedTime = 0L // just for testing

private fun showVideoWhenDoneLoading() {
    videoView?.player?.addListener(object : Player.EventListener {
        override fun onPlayerStateChanged(playWhenReady: Boolean, playbackState: Int) {
            super.onPlayerStateChanged(playWhenReady, playbackState)
            if (playbackState == Player.STATE_READY) {
                if (playWhenReady) {
                    seekToPositionAndStartCounter()
                } else {
                    cancelCounter()
                }
            }
        }
    })
}

private fun seekToPositionAndStartCounter() {
    elapsedTime = System.currentTimeMillis()

    cancelCounter()
    job = GlobalScope.launch(Dispatchers.IO) {
        Timber.d("starting Thread name = ${Thread.currentThread().name}")
        player?.seekTo(startPosition)

        if (duration != 0L) {
            runBlocking {
                delay(duration)
            }
            GlobalScope.launch(Dispatchers.Main) {
                Timber.d("duration = $duration elapsedTime = ${System.currentTimeMillis()-elapsedTime} Thread name = ${Thread.currentThread().name}")
                seekToPositionAndStartCounter()
            }
        }
    }
}

private fun cancelCounter() {
    job?.cancel()
    job = null
}