Crash on Android Oreo and higher

1. Open Application
2. Press "Play"
3. Press "Pause" in notification
4. Switch to the next song in the notification

ANR appears after five seconds

Reason: Context.startForegroundService() did not then call Service.startForeground(): ServiceRecord{36d7342 u0 ru.vinyarsky.androidaudioexample/.service.PlayerService}

Any idea how to fix this?

[SergeyVinyar]

Sorry for ignoring the bug. I'm a bit out of time.

This is connected to new background threads limitations presented in Oreo:
https://developer.android.com/about/versions/oreo/android-8.0-changes#back-all

It looks like you just need to invoke
service.startForeground(NOTIFICATION_ID, getNotification(playbackState))
inside service's onCreate method after line
notificationManager.createNotificationChannel(notificationChannel);

And you might also need to remove calling stopForeground when pausing. But i'm not sure.

Hope it helps.

Can you commit fix and update api version to 28? It will be good

[isabsent]

Works fine on Androids starting with O and higher after migration to AndroidX and android.permission.FOREGROUND_SERVICE permission in Manifest. You can check it in my fork.

[SergeyVinyar]

Unfortunately I've managed to reproduce the bug again. You have to wait for some time after switching the track via notification.
Look at MediaButtonReceiver#onReceive, Each time it gets a broadcast message, PlayerService is started with context#startForegroundService. It happens even when clicking on Next button.
It seems we need to keep the service foreground all the time. Not just during the playback.

[isabsent]

Sorry, didn't understand this bug correctly from the first reading. I need to play a single track only (a voice message playback in a messenger) and didn't see it.

By the way, I can't disable Next and Previous controls in the notification. Commenting corresponding builder.addActions in getNotification and PlaybackStateCompat.ACTION_SKIP_TO_NEXT | PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS in the stateBuilder leads to the Graphical interface of the system crashes... dialog while the application continues to work on Android API 24 when the playback button (not in the notification) is pressed with the stack trace:

java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
    at java.util.ArrayList.get(ArrayList.java:411)
    at android.app.Notification$MediaStyle.makeMediaContentView(Notification.java:5276)
    at android.app.Notification$MediaStyle.makeContentView(Notification.java:5197)
    at android.app.Notification$Builder.createContentView(Notification.java:3587)
    at com.android.systemui.statusbar.NotificationData$Entry.cacheContentViews(NotificationData.java:141)
    at com.android.systemui.statusbar.BaseStatusBar.inflateViews(BaseStatusBar.java:1730)
    at com.android.systemui.statusbar.BaseStatusBar.createNotificationViews(BaseStatusBar.java:2404)
    at com.android.systemui.statusbar.phone.PhoneStatusBar.addNotification(PhoneStatusBar.java:2023)
    at com.android.systemui.statusbar.BaseStatusBar$7$2.run(BaseStatusBar.java:727)
    at android.os.Handler.handleCallback(Handler.java:751)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:6316)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:872)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:762)

Does MediaSessionCompat requires all 5 controls should be presented in notification UI?

P.S.: Solved by setting setShowActionsInCompactView(0)