Background service is not working in Oreo

Question

I want to run my app in background if I kill the app instance also. But after I kill my app the service also stops working. Here is my code please any one help me to solve m

Answer 1

You need to create ForegroundService in order continue processing when your app is killed, as follows:

 public class SensorService extends Service{

    private PowerManager.WakeLock wakeLock;
    @Override
    public void onCreate() {
        super.onCreate();

        //wake lock is need to keep timer alive when device goes to sleep mode          
        final PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
        wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "PARTIAL_WAKE_LOCK_TAG");
        createNotificationChannel(this);
        Notification notification = new NotificationCompat.Builder(this, "NOTIFICATION_CHANNEL").setSmallIcon
                ().setContentTitle("Title")
                .setContentText("Content").build();

        startForeground(1001, notification);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if (wakeLock.isHeld()) {
            wakeLock.release();
        }

    }

     public void createNotificationChannel() {
        // Create the NotificationChannel, but only on API 26+ because
        // the NotificationChannel class is new and not in the support library
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

            CharSequence name = "Channel name";
            String description = "Description";
            int importance = NotificationManager.IMPORTANCE_DEFAULT;
            NotificationChannel channel = new NotificationChannel("NOTIFICATION_CHANNEL", name, importance);
            channel.setDescription(description);
            NotificationManager notificationManager = getApplicationContext().getSystemService(NotificationManager.class);
            notificationManager.createNotificationChannel(channel);
        }
    }
}

To start the service:

Intent i = new Intent(context, SensorService.class);
ContextCompat.startForegroundService(context, i)

Note:

• You cannot run service endlessly with this approach. During doze mode if OS recognizes it as CPU intensive then your Service will be terminated.
• You need to call stopSelf() when your Timer task has been executed successfully.