Android compileSdk 27​​启动服务自动显示通知

Question

I have an app that start a service. I know that Android Oreo has some limitations, so I started my service with this code:

context.startForegroundService(new Intent(context.getApplicationContext(), BeaconService.class));

In the BeaconService class in the onCreate() method I called startForeground() method. I did it like this:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        NotificationChannel channel = new NotificationChannel(CHANNEL_ID,
                "MyApp",
                NotificationManager.IMPORTANCE_HIGH);

        try {
            ((NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE)).createNotificationChannel(channel);
        } catch (Exception e){
            e.printStackTrace();
        }

        Notification notification = new NotificationCompat.Builder(this, CHANNEL_ID).build();
        startForeground(1, notification);

    }

My problem is that when this service is starting I got an empty notification that my app is running. Why? I don't want this notification when my app is running in foreground.

Answer 1

startForegroundService implicitly calls startForeground (int id, Notification notification) as soon as the service starts. The notification you are seeing is because of this implicit call.