Java 黑莓地图

使用BlackBerry MapField时出现问题

这是我用于显示地图的代码：

class MapScreen extends FullScreen
{
    public MapScreen() 
    {
        super( FullScreen.DEFAULT_CLOSE | FullScreen.DEFAULT_MENU );
        MapField map = new MapField();
        MapAction action = map.getAction();
        action.setCentreAndZoom(new MapPoint(40, -40), 3);   
        add(map);
    }
}

但屏幕中只显示地图分幅。请帮忙。

试试这个-

MapField mMapField;
Coordinates mCoordinates;
mCoordinates = new Coordinates( -25.900461, 28.135085, 0);
mMapField = new MapField();
mMapField.moveTo(mCoordinates);
add(mMapField);