Background Execution Limits and foreground service getting killed

Question

I'm trying to play some music using code from Google's Universal Music Player plus PlayerNotificationManager, which is not a part of the original code (but belongs to ExoPlayer 2).

My service does startForeground(...) properly by a callback from PlayerNotificationManager:

    playerNotificationManager.setNotificationListener(object : PlayerNotificationManager.NotificationListener {
        override fun onNotificationStarted(notificationId: Int, notification: Notification?) {
            startForeground(NOW_PLAYING_NOTIFICATION, notification)
        }

        override fun onNotificationCancelled(notificationId: Int) {
        }

    })

And everything seems to be OK until I leave the main activity of my application with back and the service gets mercifully killed within seconds with:

2018-11-09 12:15:28.859 3680-3695/? W/ActivityManager: Stopping service due to app idle: u0a577 -1m19s332ms pl.qus.xenoamp2/pl.qus.xenoamp.xenoservice.MusicService

The service is started properly by using

Util.startForegroundService(...)

So what could be possibly wrong?

Answer 1

In the callback onNotificationStarted (or newly introduced onNotificationPosted) instead of using

startForeground(NOW_PLAYING_NOTIFICATION, notification)

you have to use the provided id

startForeground(notificationId, notification)

and when you create the notification by PlayerNotificationManager you have to make sure the notificationId is not 0.