如何在 Robospice 结果监听器中传递参数？

Question

我有一个请求类型和几个请求参数。例如，我需要下载一些互联网页面并且我有 param = "pageNumber"。我打电话给：

mRequest = new SpiceRaspRequest(pageNumber);
mSpiceManager.execute(mRequest, new RequestResultListener());

但是在 onRequestSuccess/onRequestFailure 我只有 "result"。如果我调用多个请求，我将不知道它们是什么请求，因为结果可以异步触发。

是否可以知道 - 什么请求的结果是什么？

Answer 1

如果您想知道获得结果的 pageNumber，您需要在下载后在结果对象中设置 pageNumber。

为此，您将在 SpiceRaspRequest 和结果对象中添加几行（我们称结果对象为 RaspPage）

public class RaspPage {

....
private int mPageNumber;

public getPageNumber() {
return mPageNumber;
}

public setPageNumber(int pageNumber) {
mPageNumber = pageNumber;
}

public class SpiceRaspRequest extends SpringAndroidSpiceRequest<RaspPage>{

int mPageNumber;
public SpiceRaspRequest(int pageNumber) {
mPageNumber = pageNumber;
RestTemplate restTemplate= getRestTemplate();

// add these lines so that the Robospice does not look for the field //pageNumber that you have added to the RestPage class.
MappingJacksonHttpMessageConverter converter = new MappingJacksonHttpMessageConverter();
        converter.setSupportedMediaTypes(Collections.singletonList(MediaType.APPLICATION_JSON));
        converter.getObjectMapper().disable(SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS);
        restTemplate.getMessageConverters().add(converter);

 }


@Overrides
public RaspPage loadDataFromNetwork throws Exception {
    ...

try {

      // before returning the result you need to set the pageNumber
      RaspPage result = restTemplate.exchange(uri, HttpMethod.GET, requestEntity, RaspPage.class);

     result.setPageNumber(mPageNumber)

     return result;
}catch (HttpClientErrorException e) {
        message = e.getResponseBodyAsString();
        throw new SpiceException(message);
    }catch (HttpServerErrorException e) {
        message = e.getResponseBodyAsString();
        throw new SpiceException(message);
    }
 } 
}

现在假设您的 activity 监听结果，您将通过名为 onRequestSuccess

的回调获得结果

MainActivity extends Activity implements RequestListener<RaspPage> {

private SpiceRaspRequest;

@Overrides
public void onCreate(Bundle onSavedInstanceState) {
super.onCreate();
...
mRequest = new SpiceRaspRequest(pageNumber);
mSpiceManager.execute(mRequest, this);
}

@Overrides
public void onRequestSuccess(RaspPage result) {

int pageNumber = result.getPageNumber();
// This is the page number you are looking for
}

@Overrides
public void onRequestFailure(SpiceException spiceException) {
// TODO : do something if you failed to download the page
}

}

Answer 2

如果您在页面下载失败时遇到问题，请执行以下操作：

当请求失败时，它会触发一个 RestClientException，该异常将在回调方法 onRequestFailed(SpiceException e) 的参数中

为了知道哪个 pageNumber 下载失败，您可以扩展一个 SpiceException

public class PageFailedException extends RestClientException {

        public int mPageNumber;

        public PageFailedException(String detailMessage) {
            super(detailMessage);
        }

        public int getPageNumber() {
            return mPageNumber;
        }

        public void setPageNumber(int mPageNumber) {
            this.mPageNumber = mPageNumber;
        }
}

然后在您的 loadDataFromNetwork() 方法中，您应该捕获 SpiceException 并设置相应的 pageNumber：

try {
          ResponseEntity<RaspPage> result = restTemplate.exchange(uri, HttpMethod.GET, requestEntity, RaspPage.class);
        RaspPage raspPage = result.getBody();
            raspPage.setPageNumber(mPageNumber);

        return raspPage;
    }catch (PageFailedException e) {

        e.setPageNumber(mPageNumber);
        throw new SpiceException(e);
    }
}

最后，在您的 activity/fragment 中，您将获得下载失败的页码：

onRequestFailed(SpiceException e) {

      if (e.getCause() instanceOf PageFailedException ) {
      PageFailedException pageFailedException = (PageFailedException) e.getCause();
      int pageFailedNumber = pageFailedException.getPageNumber();
      }
    }

Answer 3

好吧，我找到了更简单明了的方法。只需为每个请求创建单独的侦听器：

mRequest = new SpiceRaspRequest(pageNumber);
mSpiceManager.execute(mRequest, new RequestResultListener(pageNumber));

然后在听众中：

private class RequestResultListener implements RequestListener<RaspRequest> {
    private int pageNumber;

    public RequestResultListener(int pageNumber) {
        this.pageNumber = pageNumber;
    }

    @Override
    public void onRequestFailure(SpiceException e) {
    }

    @Override
    public void onRequestSuccess(RaspRequest raspRequest) {
    }
}

就是这样！无需重写大量代码。

如何在 Robospice 结果监听器中传递参数？

How to pass parameters in Robospice result listener?

android

robospice