If I create Exoplayer instance in the thread which is not main thread , I can't get duration and current position from Exoplayer instance ( stuck in STATE_BUFFERING)

[jowunnal]

Hello team, I'm making a audio app using Exoplayer with waveForm library.

What I am making is when waveForm's progress has changed that Exoplayer's current position is changed by waveForm's progress.

I don't know my code is bad or not anyways, if both tasks are performed in the main thread, then audio is stuttering.

So I made Exoplayer instance at other thread which is newsingleThread in CoroutineContext.

I can pause() or play() Exoplayer but PlaybackState is always 2(means buffering) and can't get currentPosition() or duration()

How am I supposed to do in this case?

sorry, for my bad English.

I read docs but I can't understand this case.

val mediaDispatcher = Executors.newSingleThreadExecutor().asCoroutineDispatcher()

private suspend fun createExoPlayer(audioFileName: String): ExoPlayer { return withContext(mediaDispatcher){ if(Looper.myLooper()==null){ Looper.prepare() } return@withContext ExoPlayer.Builder(context).build().apply {

            setMediaItem(getMeidaItem(context, audioFileName))
            playWhenReady=true
            seekTo(0, 0L)
            playbackParameters= PlaybackParameters(1f)
            addListener(object: Player.Listener{
                override fun onPositionDiscontinuity(
                    oldPosition: Player.PositionInfo,
                    newPosition: Player.PositionInfo,
                    reason: Int
                ) {
                    super.onPositionDiscontinuity(oldPosition, newPosition, reason)
                    launch(Dispatchers.Main){
                        mediaPosition.value=newPosition.positionMs
                    }
                }

                override fun onPlaybackStateChanged(playbackState: Int) {
                    when(playbackState){
                        ExoPlayer.STATE_IDLE -> Log.d("test","idle")
                        ExoPlayer.STATE_READY -> Log.d("test","ready")
                        ExoPlayer.STATE_BUFFERING -> Log.d("test","buffering")
                        ExoPlayer.STATE_ENDED -> Log.d("test","ended")

                    }
                }
            })
            Log.d("test",playbackState.toString())
            prepare()
            Log.d("test",playbackState.toString())
        }
    }
}