I have the following problem that I am already working on for over 20 hours: I want to use an Event Channel to get a data stream from the Spotify SDK. On the native side, I can automatically display the status of a current song by subscribing to my PlayerState. My goal is to be able to access this data stream with my Flutter app. On the native side I can output the data flow without problems. But I also want to be able to access this data in my Flutter App. The problem is that I do not get the data from Kotlin to Dart. I can not execute the command mEventSink?.success(position) because the mEventSink is zero. It would be really great if someone could help me with this problem.
//... class Spotifysdk04Plugin(private var registrar: Registrar): MethodCallHandler, EventChannel.StreamHandler { //... private var mEventSink: EventChannel.EventSink? = null companion object { @JvmStatic fun registerWith(registrar: Registrar) { val channel = MethodChannel(registrar.messenger(), "spotifysdk") channel.setMethodCallHandler(Spotifysdk04Plugin(registrar)) val eventChannel = EventChannel(registrar.messenger(), "timerStream") eventChannel.setStreamHandler(Spotifysdk04Plugin(registrar)) } } override fun onMethodCall(call: MethodCall, result: Result) { if (call.method == "loginAppRemote") { //... } else if(call.method == "initEventStream") { try { spotifyAppRemote!!.playerApi.subscribeToPlayerState() .setEventCallback { playerState: PlayerState? -> Log.d("test", "test24") var position = playerState!!.playbackPosition.toDouble() Log.d("playbackPosition1", position.toString()) if(mEventSink != null) { Log.d("test", "test25") mEventSink?.success(position) } else { Log.d("test", "mEventSink == null") } } } catch (err:Throwable) { Log.v("initEventStreamError",err.message.toString()) result.success(false) } } else { result.notImplemented() } } override fun onCancel(arguments: Any?) { mEventSink = null } override fun onListen(arguments: Any?, eventSink: EventChannel.EventSink) { mEventSink = eventSink } } 