//Start foreground service
    Intent intent = new Intent(this, MyForeGroundService.class);
    intent.setAction(MyForeGroundService.ACTION_START_FOREGROUND_SERVICE);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        startForegroundService(intent);
    }else{
        startService(intent);
    }

public class MyForeGroundService extends Service implements LocationListener {

public MyForeGroundService() {
}

@Override
public IBinder onBind(Intent intent) {
    // TODO: Return the communication channel to the service.
    throw new UnsupportedOperationException("Not yet implemented");
}

@Override
public void onCreate() {
    super.onCreate();
    wakeLock();
}

@SuppressLint("InvalidWakeLockTag")
public void wakeLock() {
    pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
    assert pm != null;
    wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "partialwl");
    wl.acquire();
}

public  void stopWakeLock() {
    wl.release();
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    if (intent != null) {
        String action = intent.getAction();

        switch (action) {
            case ACTION_START_FOREGROUND_SERVICE:
                wakeLock();
                startForegroundService();
                break;
            case ACTION_STOP_FOREGROUND_SERVICE:
                stopWakeLock();
                stopForegroundService();
                break;
            case ACTION_PLAY:
                Intent openMap= new Intent(this,Map.class);
                startActivity(openMap);
                break;
            case ACTION_PAUSE:
                break;
        }
    }
    return START_STICKY;
}

/* Used to build and start foreground service. */
private void startForegroundService() {
    Log.d(TAG_FOREGROUND_SERVICE, "Start foreground service.");

    // Create notification default intent.
    Intent intent = new Intent(this,Map.class);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);

    // Create notification builder.
    NotificationCompat.Builder builder = new NotificationCompat.Builder(this);

    //Go back to Map activity if user press at the notification
    builder.setContentIntent(pendingIntent)
            .setContentTitle("gEKOning...")
            .setContentText("Tap to open gEKOn app");


    builder.setWhen(System.currentTimeMillis());
    builder.setSmallIcon(R.mipmap.ic_launcher);
    Bitmap largeIconBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher);
    builder.setLargeIcon(largeIconBitmap);
    // Make the notification max priority.
    builder.setPriority(Notification.PRIORITY_MAX);
    // Make head-up notification.
    builder.setFullScreenIntent(pendingIntent, true);


    // Build the notification.
    Notification notification = builder.build();

    // Start foreground service.
    startForeground(1, notification);
}
private void stopForegroundService() {
    Log.d(TAG_FOREGROUND_SERVICE, "Stop foreground service.");

    // Stop foreground service and remove the notification.
    stopForeground(true);

    // Stop the foreground service.
    stopSelf();
}