import org.gwtopenmaps.openlayers.client.control.MousePosition; //导入依赖的package包/类
@Override
protected void addMapControls(MapOptions mapOptions) {
    super.addMapControls(mapOptions);
    MousePositionOptions options = new MousePositionOptions();
    options.setFormatOutput(new MousePositionOutput() {
        
        @Override
        public String format(LonLat lonLat, Map map) {
            lonLat.transform(getMapProjection(), EPSG_4326);
            StringBuilder sb = new StringBuilder();
            sb.append("Lon: ").append(lonLat.lon()).append(", ");
            sb.append("Lat: ").append(lonLat.lat());
            sb.append(" (").append(map.getProjection()).append(")");
            return sb.toString();
            
        }
    });
    map.addControl(new MousePosition(options));
}
 

import org.gwtopenmaps.openlayers.client.control.MousePosition; //导入依赖的package包/类
protected void init(FixedLayerDetails[] additionalLayers) {
    this.setStylePrimaryName("mapStyle");
    map = this.getMap();
    addBaseLayers(additionalLayers);

    currentProjection = map.getProjection();
    map.addControl(new LayerSwitcher());
    map.addControl(new MousePosition());
    map.addControl(new PanZoom());
    addDrawingLayer();
    map.setMaxExtent(new Bounds(-180, -90, 180, 90));
    map.setCenter(new LonLat(0.0, 0.0), 2);
    map.setFractionalZoom(true);
}
 

import org.gwtopenmaps.openlayers.client.control.MousePosition; //导入依赖的package包/类
/**
 * <p>initializeMap</p>
 */
private void initializeMap() {
    final MapOptions mo = new MapOptions();
    mo.setProjection(PROJECTION_SPHERICAL_MERCATOR.getProjectionCode());
    mo.setDisplayProjection(PROJECTION_LAT_LON);
    mo.setMaxExtent(new Bounds(-180, -90, 180, 90).transform(PROJECTION_LAT_LON,PROJECTION_SPHERICAL_MERCATOR));
    m_mapWidget = new MapWidget("100%", "100%", mo);
    m_mapHolder.add(m_mapWidget);

    m_map = m_mapWidget.getMap();
    m_map.addControl(new PanZoomBar());
    m_map.addControl(new MousePosition());
    m_map.zoomTo(2);

    initializeImageError();

    XYZOptions xyzOptions = new XYZOptions();
    xyzOptions.setSphericalMercator(true);
    xyzOptions.setAttribution("Default tiles courtesy of <a href=\"http://open.mapquest.co.uk/\">MapQuest</a>");
    XYZ x = new XYZ("OpenStreetMap", getLayerUrl(), xyzOptions);
    x.setIsBaseLayer(true);
    x.setIsVisible(true);
    m_map.addLayer(x);

    m_markersLayer = new Markers("Remote Pollers");
    m_markersLayer.setIsVisible(true);
    m_markersLayer.setIsBaseLayer(false);
    m_map.addLayer(m_markersLayer);

    /*
    final LayerSwitcher switcher = new LayerSwitcher();
    m_map.addControl(switcher);
    */

    m_map.zoomToMaxExtent();

    Window.addResizeHandler(new ResizeHandler() {
        public void onResize(ResizeEvent event) {
            syncMapSizeWithParent();
        }
    });
}