我正在尝试将自定义列表视图添加到扩展片段的类中。但它在4个地方给出错误。这是代码：
TopStoriesFragment.java
public class TopStoriesFragment extends Fragment {
public String thehindu = "http://www.thehindu.com/news/?service=rss";
public String toi = "http://timesofindia.feedsportal.com/c/33039/f/533965/index.rss";
public String reuters = "http://feeds.reuters.com/reuters/topNews";
public String deccanherald = "http://www.deccanherald.com/rss-internal/top-stories.rss";
public String currenturl = thehindu;
AlertDialog levelDialog;
public String fakingnews = "http://thepuntended.wordpress.com/";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_top_rated, container, false);
feedTitle = (TextView) rootView.findViewById(R.id.feedtitle);
feedDescribtion = (TextView) rootView.findViewById(R.id.feeddescribtion);
startReadRss();
return rootView;
}
public class RssLoadingTask extends AsyncTask<Void, Void, Void> {
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
displayRss();
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
preReadRss();
}
@Override
protected void onProgressUpdate(Void... values) {
// TODO Auto-generated method stub
// super.onProgressUpdate(values);
}
@Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
readRss();
return null;
}
}
private RSSFeed myRssFeed = null;
TextView feedTitle;
TextView feedDescribtion;
// TextView feedPubdate;
// TextView feedLink;
public class MyCustomAdapter extends ArrayAdapter<RSSItem> {
public MyCustomAdapter(Context context, int textViewResourceId,
List<RSSItem> list) {
super(context, textViewResourceId, list);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
// return super.getView(position, convertView, parent);
View row = convertView;
if (row == null) {
//------------------------------- Error 1-------------------------------
LayoutInflater inflater = getLayoutInflater();
//------------------------------- Error 1-------------------------------
row = inflater.inflate(R.layout.row, parent, false);
}
TextView listTitle = (TextView) row.findViewById(R.id.listtitle);
listTitle.setText(myRssFeed.getList().get(position).getTitle());
TextView listPubdate = (TextView) row
.findViewById(R.id.listpubdate);
listPubdate.setText(myRssFeed.getList().get(position).getPubdate());
if (position % 2 == 0) {
listTitle.setBackgroundColor(0xff101010);
listPubdate.setBackgroundColor(0xff101010);
} else {
listTitle.setBackgroundColor(0xff080808);
listPubdate.setBackgroundColor(0xff080808);
}
return row;
}
}
private void startReadRss() {
new RssLoadingTask().execute();
}
private void preReadRss() {
feedTitle.setText("--- wait ---");
feedDescribtion.setText("");
// feedPubdate.setText("");
// feedLink.setText("");
//------------------------------- Error 2 (Solved)-------------------------------
setListAdapter(null);
//------------------------------- Error 2-------------------------------
Toast.makeText(getActivity(), "Reading RSS, Please wait.", Toast.LENGTH_LONG)
.show();
}
private void readRss() {
try {
URL rssUrl = new URL(currenturl);
SAXParserFactory mySAXParserFactory = SAXParserFactory
.newInstance();
SAXParser mySAXParser = mySAXParserFactory.newSAXParser();
XMLReader myXMLReader = mySAXParser.getXMLReader();
RSSHandler myRSSHandler = new RSSHandler();
myXMLReader.setContentHandler(myRSSHandler);
InputSource myInputSource = new InputSource(rssUrl.openStream());
myXMLReader.parse(myInputSource);
myRssFeed = myRSSHandler.getFeed();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void displayRss() {
if (myRssFeed != null) {
Calendar c = Calendar.getInstance();
// String strCurrentTiime = "\n(Time of Reading - "
// + c.get(Calendar.HOUR_OF_DAY)
// + " Hrs. : "
// + c.get(Calendar.MINUTE) + " Mins.)\n" +c.get(Calendar.AM_PM);
SimpleDateFormat sdf = new SimpleDateFormat(
"MMMM-dd-yyyy HH:mm:ss a");
String strCurrentTiime = sdf.format(c.getTime());
feedTitle.setText(myRssFeed.getTitle());
feedDescribtion.setText(strCurrentTiime);
// feedPubdate.setText(myRssFeed.getPubdate());
// feedLink.setText(myRssFeed.getLink());
MyCustomAdapter adapter = new MyCustomAdapter(getActivity(), R.layout.row,
myRssFeed.getList());
//------------------------------- Error 3 (Solved)-------------------------------
setListAdapter(adapter);
//------------------------------- Error 3-------------------------------
}
}
@Override
//------------------------------- Error 4 (Solved)-------------------------------
protected void onListItemClick(ListView l, View v, int position, long id) {
//------------------------------- Error 4-------------------------------
// TODO Auto-generated method stub
Intent intent = new Intent(getActivity(), ShowDetails.class);
Bundle bundle = new Bundle();
bundle.putString("keyTitle", myRssFeed.getItem(position).getTitle());
bundle.putString("keyDescription", myRssFeed.getItem(position)
.getDescription());
bundle.putString("keyLink", myRssFeed.getItem(position).getLink());
bundle.putString("keyPubdate", myRssFeed.getItem(position).getPubdate());
intent.putExtras(bundle);
startActivity(intent);
}
}
Top_rated Fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/back"
android:orientation="vertical" >
<TextView
android:id="@+id/feedtitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/Black"
android:layout_gravity="center"
android:layout_marginTop="10dp"
android:textStyle="bold" />
<TextView
android:textColor="@color/Black"
android:id="@+id/feeddescribtion"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal" />
</LinearLayout>
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:divider="@drawable/divider" />
<TextView
android:id="@android:id/empty"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="No Data" />
</LinearLayout>
有两个错误的地方标记在行间。错误是：
** 1：Fragment类型中的方法getLayoutInflater（Bundle）不适用于arguments（）**
2：方法setListAdapter（null）未定义类型TopStoriesFragment（通过扩展ListFragment而不是Fragment来解决。）
3：方法setListAdapter（TopStoriesFragment.MyCustomAdapter）未定义TopStoriesFragment类型（通过扩展ListFragment而不是Fragment来解决。）
4：TopStoriesFragment类型的onListItemClick（ListView，View，int，long）方法必须覆盖或实现超类型方法（通过向方法添加public解决）
答案 0 :(得分：2)
1. getLayoutInflater（）方法给出错误，因为你必须从de onCreateView方法保存inflater的实例
public LayoutInflater inflater
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
this.inflater = inflater;
}
然后你必须使用该实例，而不是使用getLayoutInflater（）
另一种方法是将inflater作为MyCustomAdapter构造函数中的参数传递。
答案 1 :(得分：2)
您的问题似乎可以通过延长ListFragment代替Fragment来解决，但您说不能这样做。所以，让我们一次解决你的问题：
1：Fragment类型中的方法getLayoutInflater（Bundle）不适用于参数（）
正如@ G3rcar建议的那样，您可以声明LayoutInflater成员字段，使用传递给LayoutInflater方法的onCreateView对其进行初始化，并在以后的代码中使用该字段。或者，您可以使用以下内容随时在LayoutInflater内检索MyCustomAdapater.getView()
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
2：方法setListAdapter（null）未定义类型TopStoriesFragment（通过扩展ListFragment而不是Fragment来解决。）
从您的代码判断，您可以简单地消除此调用。或者，请参阅我对下一个问题的建议。
3：方法setListAdapter（TopStoriesFragment.MyCustomAdapter）未定义TopStoriesFragment类型（通过扩展ListFragment而不是Fragment来解决。）
这个问题和前一个问题的解决方案是在第一次构建片段视图时存储对ListView的引用：
TextView feedTitle;
TextView feedDescribtion;
ListView listView;
public View onCreateView(...) {
...
feedTitle = (TextView) rootView.findViewById(R.id.feedtitle);
feedDescribtion = (TextView) rootView.findViewById(R.id.feeddescribtion);
listView = (ListView) rootView.findViewById(android.R.id.list);
...
}
然后您可以直接为listView设置适配器：
private void displayRss() {
...
listView.setAdapter(adapter); // instead of "setAdapter(adapter)"
}
4：TopStoriesFragment类型的onListItemClick（ListView，View，int，long）方法必须覆盖或实现超类型方法（通过向方法添加public解决）
您可以为ListView明确设置OnItemClickListener以响应商品点击次数：
listView = (ListView) rootView.findViewById(android.R.id.list);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
... // body of your current onListItemClick() method
}
});
然后，您将从onListItemClick中删除TopStoriesFragment方法。