java - 为什么 'headlines.add(xpp.nextText());' 给我一个错误？

Question

我是java编程新手。

只是想找出为什么我的代码不起作用。

boolean insideItem = false;
int eventType = xpp.getEventType();
while (eventType != XmlPullParser.END_DOCUMENT){
    if (eventType == XmlPullParser.START_TAG){
        if (xpp.getName().equalsIgnoreCase("item")){
            insideItem = true;      
} else if (xpp.getName().equalsIgnoreCase("title")) {
    if (insideItem)
        headlines.add(xpp.nextText());
} else if (xpp.getName().equalsIgnoreCase("link")) {
    if (insideItem)
        links.add(xpp.nextText());**boolean insideItem = false;
int eventType = xpp.getEventType();
while (eventType != XmlPullParser.END_DOCUMENT){
    if (eventType == XmlPullParser.START_TAG){
        if (xpp.getName().equalsIgnoreCase("item")){
            insideItem = true;      
} else if (xpp.getName().equalsIgnoreCase("title")) {
    if (insideItem)
        headlines.add(xpp.nextText());
} else if (xpp.getName().equalsIgnoreCase("link")) {
    if (insideItem)
        links.add(xpp.nextText());

它给了我以下错误:

List 类型中的方法 add(capture#3-of ?) 不适用于参数 (String)

知道如何解决这个问题吗？有人可以向我解释为什么它不起作用吗？

编辑:

这是整个 listActivity 代码:

public class Main_Menu extends ListActivity {

List<?> headlines;
List<?> links;

@SuppressWarnings("rawtypes")
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main__menu);


headlines = new ArrayList();
links = new ArrayList();

try{
URL url = new URL ("http://feeds.ign.com/ign/all");

XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
factory.setNamespaceAware(false);
XmlPullParser xpp = factory.newPullParser();

xpp.setInput(getInputStream(url), "UTF_8");

boolean insideItem = false;
int eventType = xpp.getEventType();
while (eventType != XmlPullParser.END_DOCUMENT){
    if (eventType == XmlPullParser.START_TAG){
        if (xpp.getName().equalsIgnoreCase("item")){
            insideItem = true;      
} else if (xpp.getName().equalsIgnoreCase("title")) {
    if (insideItem)
        headlines.add(xpp.nextText());
} else if (xpp.getName().equalsIgnoreCase("link")) {
    if (insideItem)
        links.add(xpp.nextText());
    }
}else if(eventType==XmlPullParser.END_TAG && xpp.getName().equalsIgnoreCase("item")){
    insideItem=false;
}

    eventType = xpp.next();

}   

} catch (MalformedURLException e) {
e.printStackTrace();
} catch (XmlPullParserException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

@SuppressWarnings("unchecked")
ArrayAdapter adapter = new ArrayAdapter(this,
    android.R.layout.simple_list_item_1, headlines);

setListAdapter(adapter);
}

Answer 1

如果没有看到列表的初始化，很难判断，但我猜你需要更改:

List links = new ArrayList();

至:

List<String> = new ArrayList<String>();