Question

我正在尝试从gwt-map库中获取谷歌指示。除了在onModuleLoad（）中分配RootPanel之外，我还复制了SimpleDirectionsDemo.java中的大部分代码。

运行后我收到“无法加载路线：SERVER_ERROR”消息回调

Directions.load(query, opts, new DirectionsCallback() {

  public void onFailure(int statusCode) {
    Window.alert("Failed to load directions: Status "
        + StatusCodes.getName(statusCode) + " " + statusCode);
  }

  public void onSuccess(DirectionResults result) {
    GWT.log("Successfully loaded directions.", null);
  }
});

GWT-Map Library的API： http://gwt-google-apis.googlecode.com/svn/javadoc/maps/1.1/index.html
可以找到工作示例 http://gwt.google.com/samples/hellomaps-1.1.0/HelloMaps.html#Simple%20Directions
虽然可以在
找到文件 http://code.google.com/p/gwt-google-apis/source/browse/#svn%2Ftrunk%2Fmaps%2Fsamples%2Fhellomaps%2Fsrc%2Fcom%2Fgoogle%2Fgwt%2Fmaps%2Fsample%2Fhellomaps%2Fclient%253Fstate%253Dclosed

，这是一个在主干中找到的工作代码片段。

 public SimpleDirectionsDemo() {
    final Grid grid = new Grid(1, 2);
    grid.setWidth("100%");
    grid.getCellFormatter().setWidth(0, 0, "500px");
    grid.getCellFormatter().setVerticalAlignment(0, 0,
        HasVerticalAlignment.ALIGN_TOP);
    grid.getCellFormatter().setWidth(0, 1, "300px");
    grid.getCellFormatter().setVerticalAlignment(0, 1,
        HasVerticalAlignment.ALIGN_TOP);
    map = new MapWidget(LatLng.newInstance(42.351505, -71.094455), 15);
    map.setHeight("480px");
    grid.setWidget(0, 0, map);
    DirectionsPanel directionsPanel = new DirectionsPanel();
    grid.setWidget(0, 1, directionsPanel);
    directionsPanel.setSize("100%", "100%");

    initWidget(grid);

    DirectionQueryOptions opts = new DirectionQueryOptions(map, directionsPanel);
    String query = "from: 500 Memorial Dr, Cambridge, MA to: 4 Yawkey Way, Boston, MA";
    Directions.load(query, opts, new DirectionsCallback() {

      public void onFailure(int statusCode) {
        Window.alert("Failed to load directions: Status "
            + StatusCodes.getName(statusCode) + " " + statusCode);
      }

      public void onSuccess(DirectionResults result) {
        GWT.log("Successfully loaded directions.", null);
      }
    });
  }

任何有谷歌地图或gwt-map经验的人都知道为什么负载会失败？

Answer 1

在我结束时意识到，我决定省略DirectionsPanel。

我对DirectionQueryOptions的原始代码是

DirectionQueryOptions opts = new DirectionQueryOptions(map);

显然导致SERVER_ERROR 基于http://gwt-google-apis.googlecode.com/svn/javadoc/maps/1.1/index.html

的API

api有一个错误，因为它给构造函数只有map作为参数。如果您要使用gwt-map库

，则必须声明DirectionsPanel

正确的代码：

DirectionQueryOptions opts = new DirectionQueryOptions(map, directionsPanel);

Google Map Directions.load失败，返回SERVER_ERROR

1 个答案: