Android + nutiteq: offline map tiles not shown

Referring to this site, I built my MapActivity as following:

public class MainActivity extends Activity {

    private MapView mapView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mapView = (MapView) findViewById(R.id.map);
        mapView.setComponents(new Components());

        RasterDataSource datasource = new PackagedRasterDataSource(new EPSG3857(), 11, 12, "t{zoom}_{x}_{y}", getApplicationContext());
        RasterLayer mapLayer = new RasterLayer(datasource, 16);
        mapView.getLayers().setBaseLayer(mapLayer);
        mapView.setFocusPoint(mapView.getLayers().getBaseLayer().getProjection().fromWgs84(47.0f, 9.0f));
        //mapView.setZoom(15);
    }

    @Override
    protected void onStart(){
        super.onStart();
        mapView.startMapping();
    }

    @Override
    protected void onStop(){
        mapView.stopMapping();
        super.onStop();
    }

}

I have put tiles in my res/raw folder, but however nothing is shown. Is there anything I am missing? According to the tutorial, it must show something. What else could I provide to debug it? The xml is a simple MapView with width and height.

The tiles are generated here and here. As parameters I set no CloudMade Key.

Couple of things to check:

1. Your new PackagedRasterDataSource(new EPSG3857(), 11, 12 ... defines that the data is for zoom levels 11-12, so you should have "t11_x_y.png" etc, with proper x and y, in your tile set, and map zoomed and centered to area covered with tiles.

2. Method fromWgs84(47.0f, 9.0f) should have order longitude (x, easting), latitude (y, northing). Make sure this is correct.