我有一个Java类将有许多内部类。这样做是为了组织并将事物保存在单独的文件中。
public class PUCObjects
{
public static class PUCNewsItem
{
public String title;
public String summary;
public String body;
public String url;
public String imageUrl;
}
}
然后，我尝试创建该内部类的新实例（在另一个解析一些远程 XML 的类中执行此操作），但由于某种原因，它似乎没有被创建：
public static ArrayList<PUCObjects.PUCNewsItem> getPUCNews() throws IOException {
String url = "http://api.puc.edu/news/list?key="+API_KEY+"&count=30";
InputStream is = downloadUrl(url);
XmlPullParserFactory pullParserFactory;
try {
pullParserFactory = XmlPullParserFactory.newInstance();
XmlPullParser parser = pullParserFactory.newPullParser();
parser.setInput(is, null);
ArrayList<PUCObjects.PUCNewsItem> items = null;
int eventType = parser.getEventType();
PUCObjects.PUCNewsItem item = null;
Log.d("Debug: ", "Start: "+url);
while (eventType != XmlPullParser.END_DOCUMENT){
String name = null;
switch (eventType){
case XmlPullParser.START_DOCUMENT:
items = new ArrayList<PUCObjects.PUCNewsItem>();
break;
case XmlPullParser.START_TAG:
name = parser.getName();
//Log.d("Start Tag Name: ", parser.getName()+" === "+name);
if (name == "item"){
Log.d("Debug: ", "Item");
item = new PUCObjects.PUCNewsItem();
} else if (item != null){
Log.d("Debug: ", "Item is not NULL 2");
if (name == "title"){
Log.d("Title: ", parser.nextText());
item.title = parser.nextText();
} else if (name == "summary"){
item.summary = parser.nextText();
} else if (name == "body_text"){
item.body = parser.nextText();
}
}
break;
case XmlPullParser.END_TAG:
name = parser.getName();
if (name.equalsIgnoreCase("item") && item != null) {
Log.d("Debug: ", "ADD ITEM");
items.add(item);
}
break;
}//end switch
eventType = parser.next();
}//end while
Log.d("Debug: ", "Done");
return items;
} catch (XmlPullParserException e) {
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}//end
我正在尝试创建对象，item = new PUCObjects.PUCNewsItem();但它似乎总是null.
有没有理由为什么这个对象没有被创建？