How do I add a marker to an ArcGIS map on Android?

I am trying to add a marker to an ArcGIS map in my android app. However, after adding a graphics layer, my map is not displayed. I'm new to Android programming and really appreciate any help. I'm not sure what I am doing wrong here. Thanks in advance.

Here are my codes:

public class SuggestionsFragment extends Fragment {
    MapView mMapView;
    GraphicsLayer graphicsLayer = new GraphicsLayer();
    Point point;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_suggestions,
            container, false);

    //Retrieve the map and initial extent from XML layout
    mMapView = (MapView)rootView.findViewById(R.id.map);

    //Create the layer
    final Layer oneMapLayer = new   ArcGISTiledMapServiceLayer("http://e1.onemap.sg/arcgis/rest/services/BASEMAP/MapServer");

    mMapView.addLayer(graphicsLayer);
    Point point = new Point(1.3799775, 103.84877200000005);
    graphicsLayer.addGraphic(new Graphic(point,new  SimpleMarkerSymbol(Color.RED,10,STYLE.CIRCLE)));

    //Know when the map layer loaded
    mMapView.setOnStatusChangedListener(new OnStatusChangedListener() {
        private static final long serialVersionUID = 1L;

        public void onStatusChanged(Object source, STATUS status) {
            if (source == oneMapLayer && status == STATUS.LAYER_LOADED) {

                mMapView.centerAt(1.3799775, 103.84877200000005, false);
                mMapView.setScale(1500,false);


            }
        }
    });



    //Add dynamic layer to MapView
    mMapView.addLayer(oneMapLayer);




    return rootView;
}

@Override
public void onDestroy() {
    super.onDestroy();
}

@Override
public void onPause() {
    super.onPause();
    mMapView.pause();
}

@Override
public void onResume() {
    super.onResume();
    mMapView.unpause();
}

}