尝试使用PlaceRequest正确的方式

Question

我有两个演示器:DevicePresenter和ContainerPresenter。我在DevicePresenter中放置了一个placerrequest来调用ContainerPresenter，参数如下:

PlaceRequest request = new PlaceRequest.Builder()
                        .nameToken("containersPage")
                        .with("action","editContainer")
                        .with("containerEditId", selectedContainerDto.getUuid().toString())
                        .build();
placeManager.revealPlace(request);

在我的ContainersPresenter我有这个重写的方法:

@Override
public void prepareFromRequest(PlaceRequest placeRequest) {
    Log.debug("prepareFromRequest in ContainersPresenter");
    super.prepareFromRequest(placeRequest);
    String actionString = placeRequest.getParameter("action", "");
    String id;
    //TODO: Should we change that to really retrieve the object from the server? Or should we introduce a model that keeps all values and inject that into all presenters?
    if (actionString.equals("editContainer")) {
        try {
            id = placeRequest.getParameter("id", null);
            for(ContainerDto cont : containerList) {
                Log.debug("Compare " + id + " with " + cont.getUuid());
                if(id.equals(cont.getUuid())) {
                    containerDialog.setCurrentContainerDTO(new ContainerDto());
                    addToPopupSlot(containerDialog);
                    break;
                }
            }
        } catch (NumberFormatException e) {
            Log.debug("id cannot be retrieved from URL");
        }
    }
}

但是当调用revealPlace时，浏览器中的URL保持不变，而显示默认的呈现器(Home)。当我打印请求时，它似乎很好:

PlaceRequest(nameToken=containersPage, params={action=editContainer, containerEditId=8fa5f730-fe0f-11e3-a3ac-0800200c9a66})

和我的NameTokens是这样的:

public class NameTokens {
    public static final String homePage = "!homePage";
    public static final String containersPage = "!containersPage";
    public static final String devicesPage = "!devicesPage";
    public static String getHomePage() {
        return homePage;
    }
    public static String getDevicesPage() {
        return devicesPage;
    }
    public static String getContainersPage() {
        return containersPage;
    }
}

我错过了什么?谢谢!

Answer 1

在您的原始代码中，当构造PlaceRequest时，您忘记了'!在您的铭牌的开头。

.nameToken("containersPage")

而您的NameTokens条目是

public static final String containersPage = "!containersPage";

正如您所指出的，在NameTokens中引用常量不太容易犯这样的错误!

Answer 2

有时问题存在于"耳朵之间"。如果我避免字符串，但使用NameTokens中的适当符号，如

            PlaceRequest request = new PlaceRequest.Builder()
                    .nameToken(NameTokens.containersPage)
                    .with("action","editContainer")
                    .with("containerEditId", selectedContainerDto.getUuid().toString())
                    .build();

效果很好。对不起!