当应用在后台时无法启动服务

Question

当收到推送通知时，我想开始播放MP3 URL的服务，但是由于Android限制性策略在背景或IDLE服务中未启动时，这是我的代码，因此请使用通知。 我还在使用数据有效负载其工作罚款应用程序位于前景中，但是当应用程序转向后台时，问题就会出现。

我的firebasemessaging class 盯着服务

 val resultIntent = Intent(applicationContext, MusicService::class.java)
                        resultIntent.putExtra("title", title)
                        resultIntent.putExtra("body", body)
                        resultIntent.putExtra("action_type", action_type)
                        resultIntent.putExtra("deep_link_type", deep_link_type)
                        resultIntent.putExtra("deep_link_id", deep_link_id)
                        resultIntent.putExtra("masjid_Id", masjid_Id)
                        resultIntent.putExtra("url", url)
                        Log.i("***TAG", "From Background")
                        resultIntent.setAction("com.example.mymasjid");
//                        resultIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_SINGLE_TOP
                        startService(resultIntent) 


**My Music Service Class** 


class MusicService : Service(), MediaPlayer.OnPreparedListener, MediaPlayer.OnCompletionListener,
    MediaPlayer.OnErrorListener {

    var objService: MusicService? = null
    var title: String = ""
    var body: String = ""
//    private val mBinder: IBinder = LocalBinder()

    override fun onCreate() {
        super.onCreate()
//        if (title.isNotEmpty() && body.isNotEmpty())
            adhanNotification(title, body)
    }

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
//        val url = intent!!.getStringExtra("url")
         title = intent!!.getStringExtra("title").toString()
         body = intent!!.getStringExtra("body").toString()
//        if (title!!.isNotEmpty() && body!!.isNotEmpty())
            Log.i("***TAG","From Background Service")
            adhanNotification(title, body)
        val url = "https://cdn.islamic.network/quran/audio/64/ar.alafasy/9.mp3"
        if (mediaPlayer != null) {
            mediaPlayer!!.stop()
            mediaPlayer!!.release()
            mediaPlayer = null
        }
        mediaPlayer = MediaPlayer()
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            mediaPlayer!!.setAudioAttributes(
                AudioAttributes.Builder()
                    .setUsage(AudioAttributes.USAGE_MEDIA)
                    .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
                    .setLegacyStreamType(AudioManager.STREAM_MUSIC)
                    .build()
            );
        } else {
            mediaPlayer!!.setAudioStreamType(AudioManager.STREAM_MUSIC);
        }
        try {
            mediaPlayer!!.setDataSource(url)
            mediaPlayer!!.prepare()
            mediaPlayer!!.start()
        } catch (e: IOException) {
            e.printStackTrace()
        }
        mediaPlayer!!.setLooping(false)
        mediaPlayer!!.setOnPreparedListener(this);
        mediaPlayer!!.setOnCompletionListener(this);
        return START_STICKY
    }

    override fun onBind(intent: Intent): IBinder? {
        return null
    }

    override fun onPrepared(p0: MediaPlayer?) {
        mediaPlayer!!.start()
        Log.i("***play", "play")
    }

    override fun onCompletion(p0: MediaPlayer?) {
        mediaPlayer!!.stop()
        Log.i("***play", "complete")
        stopSelf()
        /* mediaPlayer!!.release()

         mediaPlayer=null*/
    }

    override fun onError(p0: MediaPlayer?, p1: Int, p2: Int): Boolean {
        Log.i("***play", "error")
        return false
    }

    override fun onDestroy() {
        isServiceRunning = false
        objService = null
        super.onDestroy()
    }

    private fun adhanNotification(title: String, body: String) {
        val notificationManager = getSystemService(NOTIFICATION_SERVICE) as NotificationManager
        val mBuilder = NotificationCompat.Builder(applicationContext, "notify_001")
        val collapsedView = RemoteViews(
            packageName,
            R.layout.notification
        )
        val expandView = RemoteViews(packageName, R.layout.notification_expand)

        val onCancelIntent = Intent(this, CancelNotification::class.java)
        val onDismissPendingIntent =
            PendingIntent.getService(this.applicationContext, 0, onCancelIntent, 0)

        val time = Utility.getTime("LLL dd, KK:mm aaa")
        collapsedView.setTextViewText(R.id.tvNotifyTime, time)
        collapsedView.setTextViewText(R.id.title, title)
        collapsedView.setTextViewText(R.id.body, body)
        expandView.setTextViewText(R.id.tvNotifyTime, time)
        expandView.setTextViewText(R.id.title, title)
        expandView.setTextViewText(R.id.body, body)
//        val switchIntent = Intent(this, BackgroundService.switchButtonListener::class.java)

        mBuilder.setSmallIcon(R.drawable.ic_notification)
        mBuilder.setDeleteIntent(onDismissPendingIntent)
        //mBuilder.setAutoCancel(true)
        mBuilder.setOngoing(false)
        /*    if (sound=="default")
                mBuilder.setSound(uri)
            else if (sound=="silent")
                mBuilder.setSilent(true)*/
        mBuilder.priority = Notification.PRIORITY_HIGH
//        mBuilder.setOnlyAlertOnce(false)
        mBuilder.build().flags = Notification.FLAG_NO_CLEAR or Notification.PRIORITY_HIGH
        //mBuilder.setCustomContentView(contentView)
        mBuilder.setCustomContentView(collapsedView)
        mBuilder.setCustomBigContentView(expandView)
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val channelId = "channel_id"
            val channel =
                NotificationChannel(channelId, "channel name", NotificationManager.IMPORTANCE_HIGH)
            channel.enableVibration(true)
            channel.vibrationPattern = longArrayOf(100, 200, 300, 400, 500, 400, 300, 200, 400)
            notificationManager.createNotificationChannel(channel)
            mBuilder.setChannelId(channelId)
        }
        val random = (0 until 100).random()
        val notification = mBuilder.build()
        notificationManager.notify(random, notification)
    }

    companion object {
        var isServiceRunning = false
        var mediaPlayer: MediaPlayer? = null
    }
}