android service run multiple

this is my service code

public class MyCustomService extends Service {
public static final String INPUT_TEXT="INPUT_TEXT";
public static final String OUTPUT_TEXT="OUTPUT_TEXT";
private volatile HandlerThread mHandlerThread;
private ServiceHandler mServiceHandler;
public Socket client;

// ...


// Define how the handler will process messages
private final class ServiceHandler extends Handler {
    public ServiceHandler(Looper looper) {
        super(looper);
    }

    // Define how to handle any incoming messages here
    @Override
    public void handleMessage(Message message) {
        // ...
        // When needed, stop the service with
        // stopSelf();
    }
}


// Fires when a service is first initialized
public void onCreate() {
    super.onCreate();
    // An Android handler thread internally operates on a looper.
    mHandlerThread = new HandlerThread("MyCustomService.HandlerThread");
    mHandlerThread.start();
    // An Android service handler is a handler running on a specific background thread.
    mServiceHandler = new ServiceHandler(mHandlerThread.getLooper());



}


// Fires when a service is started up
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    // Send empty message to background thread
    mServiceHandler.sendEmptyMessageDelayed(0, 500);
    // or run code in background
    mServiceHandler.post(new Runnable() {
        @Override
        public void run() {
            // Do something here in background!

            IO.Options opts = new IO.Options();
            opts.query = "auth_token=51";
            try {
                client = IO.socket("http://192.168.0.106:3000/",opts);
                client.on("message", onMessage);
                client.connect();
            } catch (URISyntaxException e) {
                e.printStackTrace();
            }


            // If desired, stop the service
            //stopSelf();
        }
    });
    // Keep service around "sticky"
    return START_STICKY;
}

// ...

// Defines the shutdown sequence
@Override
public void onDestroy() {
    // Cleanup service before destruction
    client.disconnect();
    client.close();
    mHandlerThread.quit();
}


private Emitter.Listener onMessage = new Emitter.Listener() {
    @Override
    public void call(Object... args) {
        String message = (String) args[0];
        Log.d("recive message message message", message);

        /*create new intent to broadcast our processed data to our activity*/
        Intent resultBroadCastIntent = new Intent();
        /*set action here*/
        //resultBroadCastIntent.setAction(TextCapitalizeResultReceiver.ACTION_TEXT_CAPITALIZED);
        resultBroadCastIntent.setAction(Intent.ACTION_SEND);
        /*set intent category as default*/
        // resultBroadCastIntent.addCategory(Intent.CATEGORY_DEFAULT);
        /*add data to intent*/
        resultBroadCastIntent.putExtra(OUTPUT_TEXT, message);
        /*send broadcast */
        sendBroadcast(resultBroadCastIntent);

    }
};


@Override
public IBinder onBind(Intent intent) {
    return null;
}
}

and i run it from activity this code in onCreate

    Intent i = new Intent(this, MyCustomService.class);

    i.putExtra("foo", "bar");

    startService(i);

problem to me its every time i enter main Activity and its run service twice or 3 or 4 times so when i receive new message by socket its received same message three or Four times