Java 在使用地点和活动导航时，左侧的菜单栏会消失

在我的应用程序中，我希望在所有页面上保持左侧的菜单，但是当我单击左侧的按钮时，我的菜单消失了。我在这里附上我的代码

启动器类：

public class SmartEBRM implements EntryPoint {

//private Place defaultPlace = new SmartEBRMViewPlace("World!");
//private SimplePanel appWidget = new SimplePanel();

@SuppressWarnings("deprecation")
@Override
public void onModuleLoad() {
    // TODO Auto-generated method stub

    ClientFactory clientFactory = GWT.create(ClientFactory.class);
    EventBus eventBus = clientFactory.getEventBus();
    PlaceController placeController = clientFactory.getPlaceController();

    // Start ActivityManager for the main widget with our ActivityMapper
    ActivityMapper activityMapper = new AppActivityMapper(clientFactory);
    ActivityManager activityManager = new ActivityManager(activityMapper, eventBus);
    SmartEBRMViewImpl smartViewImpl = new SmartEBRMViewImpl();
    activityManager.setDisplay (smartViewImpl.getHTMLPannel());


    // Start PlaceHistoryHandler with our PlaceHistoryMapper
    AppPlaceHistoryMapper historyMapper= GWT.create(AppPlaceHistoryMapper.class);
    PlaceHistoryHandler historyHandler = new PlaceHistoryHandler(historyMapper);
    SmartEBRMViewPlace smartViewPlace = new SmartEBRMViewPlace();
    //ClearPannelPlace smartViewPlace = new ClearPannelPlace();
    historyHandler.register(placeController, eventBus, smartViewPlace);
    historyHandler.handleCurrentHistory();

    RootPanel.get().add(smartViewImpl.getHTMLPannel());
}
}

主要观点：

public class SmartEBRMViewImpl extends Composite implements SmartEBRMView{

private static SmartEBRMViewImplUiBinder uiBinder = GWT
        .create(SmartEBRMViewImplUiBinder.class);

@UiField DockLayoutPanel docLayoutPanel;
@UiField StackPanel stackPanel;
@UiField Button enterpriseView;
@UiField Button testComponent;
@UiField SimplePanel centerPanel;
@UiField SimplePanel westPanel;
@UiField SimplePanel northPanel;

private Presenter listener;

interface SmartEBRMViewImplUiBinder extends
        UiBinder<Widget, SmartEBRMViewImpl> {
}

public SmartEBRMViewImpl() {
    initWidget(uiBinder.createAndBindUi(this));
}

public SmartEBRMViewImpl(String firstName) {
    initWidget(uiBinder.createAndBindUi(this));
}

@Override
public void setPresenter(Presenter listener) {
    // TODO Auto-generated method stub
    this.listener = listener;

}

public SimplePanel getHTMLPannel () {
    return centerPanel;
}

public SimplePanel getNorthPanel () {
    return northPanel;
}

public SimplePanel getWestPanel () {
    return westPanel;
}

@UiHandler("enterpriseView")
public void onClearButtonClick(ClickEvent e)
{
    listener.goTo(new EnterpriseInvoiceCompareViewPlace());
}

制图员：

public class AppActivityMapper implements ActivityMapper{

private ClientFactory clientFactory;

/**
 * AppActivityMapper associates each Place with its corresponding
 * {@link Activity}
 * 
 * @param clientFactory
 *            Factory to be passed to activities
 */
public AppActivityMapper(ClientFactory clientFactory) {
    super();
    this.clientFactory = clientFactory;
}

/**
 * Map each Place to its corresponding Activity. This would be a great use
 * for GIN.
 */
@Override
public Activity getActivity(Place place) {
    if (place instanceof EnterpriseInvoiceCompareViewPlace){
        return new EnterpriseInvoiceCompareActivity((EnterpriseInvoiceCompareViewPlace) place, clientFactory);
    }
    else if (place instanceof SmartEBRMViewPlace)
        return new SmartEBRMViewActivity((SmartEBRMViewPlace) place, clientFactory);

    return null;
}

}

地点：

public class EnterpriseInvoiceCompareViewPlace extends Place{

public EnterpriseInvoiceCompareViewPlace()
{
}

public static class Tokenizer implements PlaceTokenizer<EnterpriseInvoiceCompareViewPlace>
{

    @Override
    public String getToken(EnterpriseInvoiceCompareViewPlace place)
    {
        return "EntInvoiceCompare";
    }

    @Override
    public EnterpriseInvoiceCompareViewPlace getPlace(String token)
    {
        return new EnterpriseInvoiceCompareViewPlace();
    }

}

}

public class SmartEBRMViewPlace extends Place{

public SmartEBRMViewPlace()
{
}

public static class Tokenizer implements PlaceTokenizer<SmartEBRMViewPlace>
{

    @Override
    public String getToken(SmartEBRMViewPlace place)
    {
        return "SmartView";
    }

    @Override
    public SmartEBRMViewPlace getPlace(String token)
    {
        return new SmartEBRMViewPlace();
    }

}

}

公共类EnterpriseInvoiceCompareViewPlace扩展位置{
公共企业InvoiceCompareViewPlace（）
{
}
公共静态类标记器实现PlaceTokenizer
{
@凌驾
获取公共字符串（EnterpriseInvoiceCompareViewPlace）
{
返回“EntInvoiceCompare”；
}
@凌驾
公共企业InvoiceCompareViewPlace getPlace（字符串标记）
{
返回新的EnterpriseInvoiceCompareViewPlace（）；
}
}
}
公共类智能BRMViewPlace扩展位置{
公共智能brmviewplace（）
{
}
公共静态类标记器实现PlaceTokenizer
{
@凌驾
公共字符串getToken（智能BRMViewPlace位置）
{
返回“SmartView”；
}
@凌驾
公共智能BRMViewPlace getPlace（字符串令牌）
{
返回新的SmartbrmviewPlace（）；
}
}
}

---

如果您想在左侧设置一个静态菜单，那么它不应该是一个活动（如果需要，它仍然可以对

PlaceChangeEvent

事件作出反应），或者您应该在左侧区域设置2个

ActivityManager

（无论在哪个位置，都有一个始终返回菜单活动的

ActivityMapper

）和中心区域（带有一个

ActivityMapper

，根据当前位置返回相应的活动）

---

---

顺便说一句，我觉得很奇怪，您将

smartViewImpl.getHTMLPannel（）

添加到

RootPanel

，而不是

smartViewImpl

我最初添加了smartViewImpl，但随后在左侧得到了两个菜单。如果我点击其中一个，我会进入第二个页面，如果我点击最左边的一个，它什么也不做。我没有看你所有的代码，因为代码太多了。我怀疑你还没有完全掌握所有的事情都应该被安排和组织，所以我只能给你一个建议。还有，我发布了一些关于场所和活动的文章，这些文章可能会帮助您理解所有这些。您能建议我应该使用什么代码，以便您可以建议解决方案吗？我是GWT的新手，“地点和活动”完全把我搞糊涂了。

public class AppActivityMapper implements ActivityMapper{

private ClientFactory clientFactory;

/**
 * AppActivityMapper associates each Place with its corresponding
 * {@link Activity}
 * 
 * @param clientFactory
 *            Factory to be passed to activities
 */
public AppActivityMapper(ClientFactory clientFactory) {
    super();
    this.clientFactory = clientFactory;
}

/**
 * Map each Place to its corresponding Activity. This would be a great use
 * for GIN.
 */
@Override
public Activity getActivity(Place place) {
    if (place instanceof EnterpriseInvoiceCompareViewPlace){
        return new EnterpriseInvoiceCompareActivity((EnterpriseInvoiceCompareViewPlace) place, clientFactory);
    }
    else if (place instanceof SmartEBRMViewPlace)
        return new SmartEBRMViewActivity((SmartEBRMViewPlace) place, clientFactory);

    return null;
}

}

public class EnterpriseInvoiceCompareViewPlace extends Place{

public EnterpriseInvoiceCompareViewPlace()
{
}

public static class Tokenizer implements PlaceTokenizer<EnterpriseInvoiceCompareViewPlace>
{

    @Override
    public String getToken(EnterpriseInvoiceCompareViewPlace place)
    {
        return "EntInvoiceCompare";
    }

    @Override
    public EnterpriseInvoiceCompareViewPlace getPlace(String token)
    {
        return new EnterpriseInvoiceCompareViewPlace();
    }

}

}

public class SmartEBRMViewPlace extends Place{

public SmartEBRMViewPlace()
{
}

public static class Tokenizer implements PlaceTokenizer<SmartEBRMViewPlace>
{

    @Override
    public String getToken(SmartEBRMViewPlace place)
    {
        return "SmartView";
    }

    @Override
    public SmartEBRMViewPlace getPlace(String token)
    {
        return new SmartEBRMViewPlace();
    }

}

}