Question

我正在尝试为Android编写一个简单的RSS阅读器应用程序。我使用Retrofit与SimpleXMLConverter进行网络通信，从XML填充POJO。这是我的REST API：

package ru.unatco.rss.data;

import java.util.List;

import retrofit.Callback;
import retrofit.http.GET;

public interface RssAdapter {
    @GET("/radio-t")
    void getItems(Callback<RadioTItems> callback);
}

这是调用API的代码：

RestAdapter restAdapter = new RestAdapter.Builder()
                .setEndpoint("http://feeds.rucast.net")
                .setConverter(new SimpleXMLConverter())
                .build();

RssAdapter rssAdapter = restAdapter.create(RssAdapter.class);
rssAdapter.getItems(new Callback<RadioTItems>() {
    @Override
    public void success(RadioTItems radioTItems, Response response) {
        System.out.println(radioTItems.toString());
    }
    @Override
    public void failure(RetrofitError error) {
        System.out.println(error);
    }
});

这些是我想要获得的POJO：

package ru.unatco.rss.data;

import org.simpleframework.xml.ElementList;
import org.simpleframework.xml.Root;

import java.util.List;

@Root(name = "rss", strict = false)
public class RadioTItems {
    @ElementList(required = false, name = "channel")
    List<RadioTItem> items;
}

package ru.unatco.rss.data;

import org.simpleframework.xml.Element;
import org.simpleframework.xml.Root;

@Root(name = "item", strict = false)
public class RadioTItem {
    @Element(name = "title")
    String mTitle;
    @Element(name = "description")
    String mDescription;

    public RadioTItem() {}
}

RSS的来源是here。现在，当我尝试执行请求时，我得到了这个例外：

retrofit.RetrofitError: org.simpleframework.xml.core.ValueRequiredException: Unable to satisfy @org.simpleframework.xml.Element(data=false, name=description, required=true, type=void) on field 'mDescription' java.lang.String ru.unatco.rss.data.RadioTItem.mDescription for class ru.unatco.rss.data.RadioTItem at line 2

如果我在RadioTItem mDescription中设置mTitle和@Element(required = false)字段，则解析完成，但两个字段均为空。任何想法如何摆脱这个问题？

Answer 1

好的，经过多次尝试 - 失败循环后，我找到了一个可行的解决方案。我完全重写了我的POJO，这就是我所拥有的：

package ru.unatco.rss.data;

import org.simpleframework.xml.Element;
import org.simpleframework.xml.Root;

@Root(name = "rss", strict = false)
public class Feed {
    @Element(name = "channel")
    private Channel mChannel;

    public Channel getmChannel() {
        return mChannel;
    }
}

package ru.unatco.rss.data;

import org.simpleframework.xml.ElementList;
import org.simpleframework.xml.Root;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import ru.unatco.rss.model.Item;

@Root(name = "channel", strict = false)
public class Channel {
    @ElementList(inline = true)
    private List<FeedItem> mFeedItems;

    public List<FeedItem> getFeedItems() {
        return mFeedItems;
    }
}

package ru.unatco.rss.data;

import org.simpleframework.xml.Element;
import org.simpleframework.xml.Root;

import ru.unatco.rss.model.Item;

@Root(name = "item", strict = false)
public class FeedItem {
    @Element(name = "title")
    private String mTitle;
    @Element(name = "description")
    private String mDescription;

    public String getTitle() {
        return mTitle;
    }

    public String getDescription() {
        return mDescription;
    }
}

通过所有这些改变，我能够得到我想要的东西。

在Retrofit中RSS feed解析期间的ValueRequiredException

1 个答案: