This is due to Android O bg service limitations.
So now you need to call startForeground() only for services that were started using startForegroundService() and call it the first 5 seconds after the service starts.
Here is the guide - https://developer.android.com/about/versions/oreo/background#services
Like this:
//Start service: if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { startForegroundService(new Intent(this, YourService.class)); } else { startService(new Intent(this, YourService.class)); }
Then create and show a notification (with a channel, as previously assumed):
private void createAndShowForegroundNotification(Service yourService, int notificationId) { final NotificationCompat.Builder builder = getNotificationBuilder(yourService, "com.example.your_app.notification.CHANNEL_ID_FOREGROUND", // Channel id NotificationManagerCompat.IMPORTANCE_LOW); //Low importance prevent visual appearance for this notification channel on top builder.setOngoing(true) .setSmallIcon(R.drawable.small_icon) .setContentTitle(yourService.getString(R.string.title)) .setContentText(yourService.getString(R.string.content)); Notification notification = builder.build(); yourService.startForeground(notificationId, notification); if (notificationId != lastShownNotificationId) { // Cancel previous notification final NotificationManager nm = (NotificationManager) yourService.getSystemService(Activity.NOTIFICATION_SERVICE); nm.cancel(lastShownNotificationId); } lastShownNotificationId = notificationId; } public static NotificationCompat.Builder getNotificationBuilder(Context context, String channelId, int importance) { NotificationCompat.Builder builder; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { prepareChannel(context, channelId, importance); builder = new NotificationCompat.Builder(context, channelId); } else { builder = new NotificationCompat.Builder(context); } return builder; } @TargetApi(26) private static void prepareChannel(Context context, String id, int importance) { final String appName = context.getString(R.string.app_name); String description = context.getString(R.string.notifications_channel_description); final NotificationManager nm = (NotificationManager) context.getSystemService(Activity.NOTIFICATION_SERVICE); if(nm != null) { NotificationChannel nChannel = nm.getNotificationChannel(id); if (nChannel == null) { nChannel = new NotificationChannel(id, appName, importance); nChannel.setDescription(description); nm.createNotificationChannel(nChannel); } } }
Remember that your foreground notification will have the same state as other notifications, even if you use different channel identifiers, so it can be hidden as a group with others. Use different groups to avoid this.