_player.setOnCompletionListener {
            Log.d("service","setOnCompletionListener is called")

            val manager:NotificationManager=getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

            if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){

                val channel = NotificationChannel("channel_id_sample","プッシュ通知",NotificationManager.IMPORTANCE_DEFAULT)
                channel.apply {
                    enableLights(true) // 通知時にライトを有効にする
                    lightColor = Color.WHITE // 通知時のライトの色
                    lockscreenVisibility = Notification.VISIBILITY_PUBLIC //ロック画面での表示レベル
                }
                manager.createNotificationChannel(channel)
            }

            val builder=NotificationCompat.Builder(this)
            builder.apply {
                setSmallIcon(android.R.drawable.ic_dialog_info)
                setContentTitle("再生終了")
                setContentText("音声ファイルの再生が終了しました")
            }

            if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
                builder.setChannelId("channel_id_sample");
            }

            val notification = builder.build()
            manager.notify(1, notification)
            stopSelf()
        }