问题
I have searched a lot, but I can't assign my XML with My Classes and I take an Error from Retrofit when I am trying to Deserialize the XML.
This is the XML that I call from my Interface ( only the first Item):
<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0"
xmlns:content="http://purl.org/rss/1.0/modules/content/"
xmlns:wfw="http://wellformedweb.org/CommentAPI/"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:atom="http://www.w3.org/2005/Atom"
xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
>
<channel>
<title>Flow</title>
<atom:link href="http://flow.com/?feed=single_gallery_feed&paged=0" rel="self" type="application/rss+xml" />
<link>http://flow.com</link>
<description></description>
<lastBuildDate>Mon, 02 Nov 2015 17:07:54 +0000</lastBuildDate>
<language>en-US</language>
<sy:updatePeriod>hourly</sy:updatePeriod>
<sy:updateFrequency>1</sy:updateFrequency>
<generator>http://wordpress.org/?v=4.3.1</generator>
<item>
<title>Pocket Rocket Power</title>
<link>http://flow.com/portfolio/pocket-rocket-power/</link>
<comments>http://flow.com/portfolio/pocket-rocket-power/#comments</comments>
<pubDate>Mon, 02 Nov 2015 17:06:17 +0000</pubDate>
<dc:creator></dc:creator>
<category><![CDATA[Accessories]]></category>
<category><![CDATA[Car Accessories]]></category>
<category><![CDATA[Cool Gadgets]]></category>
<category><![CDATA[Crowdfunding Projects]]></category>
<category><![CDATA[Gift Ideas $20 - $50]]></category>
<category><![CDATA[iPad Accessories]]></category>
<category><![CDATA[iPhone 4/4s]]></category>
<category><![CDATA[iPhone 5/5s]]></category>
<category><![CDATA[iPhone 6/6s Accessories]]></category>
<category><![CDATA[iPhone Accessories]]></category>
<category><![CDATA[Made in USA]]></category>
<category><![CDATA[Power Banks]]></category>
<category><![CDATA[Recommended]]></category>
<category><![CDATA[Samsung Accessories]]></category>
<category><![CDATA[Travel Must Haves]]></category>
<guid isPermaLink="false">http://flow.com/?p=81755</guid>
<content:encoded><![CDATA[<img class="gf-rss-single-image" src="http://cdn.flow.com/wp-content/uploads/2015/11/Pocket-Rocket-Power-01.jpeg" /><img class="gf-rss-single-image" src="http://cdn.flow.com/wp-content/uploads/2015/11/Pocket-Rocket-Power-02.jpeg" /><img class="gf-rss-single-image" src="http://cdn.flow.com/wp-content/uploads/2015/11/Pocket-Rocket-Power-03.jpeg" /><img class="gf-rss-single-image" src="http://cdn.flow.com/wp-content/uploads/2015/11/Pocket-Rocket-Power-04.jpeg" /><img class="gf-rss-single-image" src="http://cdn.flow.com/wp-content/uploads/2015/11/Pocket-Rocket-Power-05.jpeg" /><img class="gf-rss-single-image" src="http://cdn.flow.com/wp-content/uploads/2015/11/Pocket-Rocket-Power-06.jpeg" /><div class="gf-rss-price">Price: $<span class="gf-price">25</span></div><img width="1300" height="1000" src="http://cdn.flow.com/wp-content/uploads/2015/11/Pocket-Rocket-Power-03.jpeg" class="attachment-full wp-post-image" alt="Pocket Rocket Power 03" style="float:none; margin:0 0 15px; display:block;" />
]]></content:encoded>
<slash:comments>0</slash:comments>
</item>
So I Use Asynchronous method to take the items with a Callback, This is the java Interface :
public interface ApiService {
@GET("/?feed=single_gallery_feed")
void getGadgets(@Query("paged")int page, Callback<Channel> gadgetsCallback);
}
This is the Rest Client Class where the Interface is being generated:
public class RestClient {
private ApiService apiService;
public RestClient(){
RestAdapter restAdapter = new RestAdapter.Builder()
.setLogLevel(RestAdapter.LogLevel.FULL)
.setClient(new OkClient(new OkHttpClient()))
.setEndpoint("http://flow.com")
.setConverter(new SimpleXMLConverter())
.build();
apiService = restAdapter.create(ApiService.class);
}
public ApiService getApiService(){
return apiService;
}
}
Also , I have created some Model Classes to host the Tags from the XML , I omit Getters :
@Root(name="rss", strict = false)
public class Rss {
@Element(name="channel")
private Channel channel;
}
@Root(name = "item", strict = false)
public class Item {
@Element(name = "title")
private String title;
@Element(name = "link")
private String link;
@Element(name = "comments")
private String comments;
@Element(name = "pubDate")
private String pubDate;
}
@Root(name="channel", strict = false)
public class Channel {
@ElementList(name="item",inline = true)
private ArrayList<Item> items;
}
Finally I call the service in the MainActivity:
public class MainActivity extends AppCompatActivity {
private ArrayList<Item> mList;
private Button pagerButton;
private int page = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pagerButton = (Button)findViewById(R.id.pager);
pagerButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
RestClient restClient = new RestClient();
Callback<Channel> callback = new Callback<Channel>() {
@Override
public void success(Channel gadgets, Response response) {
mList = gadgets.getItems();
}
@Override
public void failure(RetrofitError error) {
Log.d("billy",error.getLocalizedMessage());
}
};
restClient.getApiService().getGadgets(page,callback);
page++;
}
});
if(mList != null) {
for(int i = 0; i < mList.size();i++) {
//mList = mItem.getGadgets();
Log.d("billy", "Item : " + String.valueOf(i));
Log.d("billy", "Title: " + mList.get(i).getTitle());
Log.d("billy", "PubDate: " + mList.get(i).getPubDate());
Log.d("billy", "ImageURL: " + mList.get(i).getLink());
Log.d("billy","-------------------------------------------------------------------- ");
}
}
}
}
So, I take this error from Retrofit :
org.simpleframework.xml.core.ValueRequiredException: Unable to satisfy @org.simpleframework.xml.ElementList(data=false, empty=true, entry=, inline=true, name=item, required=true, type=void) on field 'items' private java.util.ArrayList Model.Channel.items for class Model.Channel at line 9
I have searched everywhere and I think that my Implementation is correct but I can't find the mistake, I have changed many times my Model classes and I have used POJO generators from the web , but again I can't fix this error. Please help! Thank you!
回答1:
Eventually I changed my Callback and it Worked . I had to use the Model Class Rss in the Callback for example :
public interface ApiService {
@GET("/?feed=single_gallery_feed")
void getGadgets(@Query("paged")int page, Callback<Rss> gadgetsCallback);
}
And the Callback inside MainActivity:
RestClient restClient = new RestClient();
Callback callback = new Callback() {
@Override
public void success(Object o, Response response) {
Categories_ = (Categories)o;
}
@Override
public void failure(RetrofitError error) {
Toast toast = Toast.makeText(getApplication(), "Something went wrong!!", Toast.LENGTH_SHORT);
toast.show();
}
};
restClient.getApiService().getCategories(callback);
来源：https://stackoverflow.com/questions/33528543/cant-read-rss-xml-with-simple-xml-and-retrofit