Использование фрагмента для ListView

Question

Я пытаюсь заполнить мои ListView элементами из XML-файла.

Я знаю его, потому что я использую Fragments, но я действительно не знаю, как я могу это исправить.

StackTrace

FATAL EXCEPTION: main 
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.iklikla.codetechblog/com.iklikla.codetechblog.FrontpageActivity}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list' 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
      at android.app.ActivityThread.access$600(ActivityThread.java:141) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
      at android.os.Handler.dispatchMessage(Handler.java:99) 
      at android.os.Looper.loop(Looper.java:137) 
      at android.app.ActivityThread.main(ActivityThread.java:5041) 
      at java.lang.reflect.Method.invokeNative(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:511) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
      at dalvik.system.NativeStart.main(Native Method) 
    Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list' 
      at android.app.ListActivity.onContentChanged(ListActivity.java:243) 
      at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:273) 
      at android.app.Activity.setContentView(Activity.java:1881) 
      at com.iklikla.codetechblog.FrontpageActivity.onCreate(FrontpageActivity.java:56) 
      at android.app.Activity.performCreate(Activity.java:5104) 
      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
            at android.app.ActivityThread.access$600(ActivityThread.java:141) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
            at android.os.Handler.dispatchMessage(Handler.java:99) 
            at android.os.Looper.loop(Looper.java:137) 
            at android.app.ActivityThread.main(ActivityThread.java:5041) 
            at java.lang.reflect.Method.invokeNative(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:511) 

Моя активность:

public class FrontpageActivity extends ListActivity { 

    // All static variables 
    static final String URL = "http://blog.codetech.de/rss"; 
    // XML node keys 
    static final String KEY_ITEM = "item"; // parent node 
    static final String KEY_TITLE = "title"; 
    static final String KEY_LINK = "link"; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_frontpage); 

     ActionBar actionBar = getActionBar(); 
     actionBar.setDisplayUseLogoEnabled(true); 

     if (savedInstanceState == null) { 
      getFragmentManager().beginTransaction() 
        .add(R.id.container, new PlaceholderFragment()) 
        .commit(); 
     } 

     ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>(); 

     XMLParser parser = new XMLParser(); 
     String xml = parser.getXmlFromUrl(URL); // getting XML 
     Document doc = parser.getDomElement(xml); // getting DOM element 

     NodeList nl = doc.getElementsByTagName(KEY_ITEM); 
     // looping through all item nodes <item> 
     for (int i = 0; i < nl.getLength(); i++) { 
      // creating new HashMap 
      HashMap<String, String> map = new HashMap<String, String>(); 
      Element e = (Element) nl.item(i); 
      // adding each child node to HashMap key => value 
      map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE)); 
      map.put(KEY_LINK, parser.getValue(e, KEY_LINK)); 

      // adding HashList to ArrayList 
      menuItems.add(map); 
     } 

     // Adding menuItems to ListView 
     ListAdapter adapter = new SimpleAdapter(this, menuItems, 
       R.layout.list, 
       new String[] { KEY_TITLE, KEY_LINK }, new int[] { 
       R.id.textView, R.id.textView2 }); 

     setListAdapter(adapter); 

     // selecting single ListView item 
     ListView lv = getListView(); 
     // listening to single listitem click 
     lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { 

      @Override 
      public void onItemClick(AdapterView<?> parent, View view, 
            int position, long id) { 
       // getting values from selected ListItem 
       String title = ((TextView) view.findViewById(R.id.textView)).getText().toString(); 
       String link = ((TextView) view.findViewById(R.id.textView2)).getText().toString(); 

       // Starting new intent 
       Intent in = new Intent(getApplicationContext(), WebViewActivity.class); 
       in.putExtra(KEY_TITLE, title); 
       in.putExtra(KEY_LINK, link); 
       startActivity(in); 

      } 
     }); 
    } 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 

     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.frontpage, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) 
    { 
     int itemId = item.getItemId(); 
     switch (itemId) 
     { 
      case R.id.action_reload: 
       Intent intent_reload = new Intent(this, FrontpageActivity.class); 
       startActivity(intent_reload); 
       break; 
      case R.id.action_about: 
       Intent intent_about = new Intent(this, AboutActivity.class); 
       startActivity(intent_about); 
       break; 
      default: 
       break; 
     } 

     return true; 
    } 

    /** 
    * A placeholder fragment containing a simple view. 
    */ 
    public static class PlaceholderFragment extends Fragment { 

     public PlaceholderFragment() { 
     } 

     @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
       Bundle savedInstanceState) { 
      View rootView = inflater.inflate(R.layout.fragment_frontpage, container, false); 
      return rootView; 
     } 
    } 

} 

И мой фрагмент XML:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    tools:context="com.iklikla.codetechblog.FrontpageActivity$PlaceholderFragment" 
    android:background="@color/background_grey"> 

    <ListView 
    android:id="@android:id/list" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:entries="@array/tutorialTitle" 
    android:background="@drawable/card"/> 

</RelativeLayout> 

EDIT: Вот мой activity_frontpage.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:id="@+id/container" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context="com.iklikla.codetechblog.FrontpageActivity" 
tools:ignore="MergeRootFrame" /> 

Answer 1

public class FrontpageActivity extends ListActivity 

В activity_frontpage.xml вы должны сог ваша деятельность распространяется ListActivity и у вас есть setContentView(R.layout.activity_frontpage) в onCreate

<ListView android:id="@android:id/list" 

Edit:

Если вам нужно ListView в Fragment. Вы все ошиблись. Fragment размещен по адресу Activity. Вам нужно переместить весь код на фрагмент и использовать асинтез для gettign xml с сервера. Остальное все самоочевидно, я думаю.

ссылки вы должны проверить

http://developer.android.com/training/basics/network-ops/xml.html http://developer.android.com/reference/android/app/ListActivity.html http://developer.android.com/reference/android/os/AsyncTask.html

public class FrontpageActivity extends Activity { 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_frontpage); 
     ActionBar actionBar = getActionBar(); 
     actionBar.setDisplayUseLogoEnabled(true); 
     getFragmentManager().beginTransaction() 
        .add(R.id.container, new MyFragment()) 
        .commit(); 

    } 
} 

MyFragment

public class MyFragment extends ListFragment { 
     static final String URL = "http://blog.codetech.de/rss"; 
     // XML node keys 
     static final String KEY_ITEM = "item"; // parent node 
     static final String KEY_TITLE = "title"; 
     static final String KEY_LINK = "link"; 
     private static final String ns = null; 
     ListView lv; 
     List<Entry> all = new ArrayList<Entry>(); 
     ProgressDialog pd; 

      @Override 
      public View onCreateView(LayoutInflater inflater, ViewGroup container, 
        Bundle savedInstanceState) { 
       View rootView = inflater.inflate(R.layout.my_fragment1, container, false); 
       pd = new ProgressDialog(getActivity()); 
       pd.setMessage("Getting xml and parsing..."); 
       return rootView; 
      } 

      @Override 
      public void onActivityCreated(Bundle savedInstanceState) { 
       // TODO Auto-generated method stub 
       super.onActivityCreated(savedInstanceState); 
       lv = getListView(); 
       new TheTask(getActivity()).execute(); 
      } 
      class TheTask extends AsyncTask<Void,ArrayList<Entry>,ArrayList<Entry>> 
      { 
      Context context; 
      TheTask(Context context) 
      { 
       this.context = context; 
      } 
       @Override 
       protected void onPostExecute(ArrayList<Entry> result) { 
        // TODO Auto-generated method stub 
        super.onPostExecute(result); 
        pd.dismiss(); 
        CustomAdapter cus = new CustomAdapter(context,result); 
        lv.setAdapter(cus); 
        lv.setOnItemClickListener(new OnItemClickListener(){ 

         @Override 
         public void onItemClick(AdapterView<?> arg0, View arg1, 
           int arg2, long arg3) { 
          // TODO Auto-generated method stub 
          Toast.makeText(context, "text", Toast.LENGTH_LONG).show(); 
         } 

        }); 
       } 

       @Override 
       protected void onPreExecute() { 
        // TODO Auto-generated method stub 
        super.onPreExecute(); 
        pd.show(); 
       } 

       @Override 
       protected ArrayList<Entry> doInBackground(Void... params) { 
        // TODO Auto-generated method stub 
        try 
        { 
        HttpClient httpclient = new DefaultHttpClient(); 
        httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1); 
        HttpGet request = new HttpGet(URL); 
        HttpResponse response = httpclient.execute(request); 
        HttpEntity resEntity = response.getEntity(); 
        String _respons=EntityUtils.toString(resEntity); 
        InputStream is = new ByteArrayInputStream(_respons.getBytes()); 
        XmlPullParser parser = Xml.newPullParser(); 
        parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false); 
        parser.setInput(is, null); 
        parser.nextTag(); 
        all =readFeed(parser); 
        }catch(Exception e) 
        { 
         e.printStackTrace(); 
        } 
        return (ArrayList<Entry>) all; 
       } 

      } 
      private List<Entry> readFeed(XmlPullParser parser) throws XmlPullParserException, IOException { 
       List<Entry> all = null ; 
       parser.require(XmlPullParser.START_TAG, ns, "rss"); 
       while (parser.next() != XmlPullParser.END_TAG) { 
        if (parser.getEventType() != XmlPullParser.START_TAG) { 
         continue; 
        } 
        String name = parser.getName(); 
        // Starts by looking for the entry tag 
        if (name.equals("channel")) { 

         all= readItem(parser); 
        } else { 
         skip(parser); 
        } 
       } 
       return all; 
      } 
      private List<Entry> readItem(XmlPullParser parser) throws XmlPullParserException, IOException { 
       List<Entry> entries = new ArrayList<Entry>(); 
       parser.require(XmlPullParser.START_TAG, ns, "channel"); 
       while (parser.next() != XmlPullParser.END_TAG) { 
        if (parser.getEventType() != XmlPullParser.START_TAG) { 
         continue; 
        } 
        String name = parser.getName(); 
        // Starts by looking for the entry tag 
        if (name.equals("item")) { 

         entries.add(readEntry(parser)); 
        } else { 
         skip(parser); 
        } 
       } 
       return entries; 
      } 

      private Entry readEntry(XmlPullParser parser) throws XmlPullParserException, IOException { 
       parser.require(XmlPullParser.START_TAG, ns, "item"); 
       String title = null; 
       String link = null; 
       while (parser.next() != XmlPullParser.END_TAG) { 
        if (parser.getEventType() != XmlPullParser.START_TAG) { 
         continue; 
        } 
        String name = parser.getName(); 
        if (name.equals("title")) { 
         title = readTitle(parser); 
        } else if (name.equals("link")) { 
         link = readLink(parser); 
        } else { 
         skip(parser); 
        } 
       } 
       return new Entry(title, link); 
      } 

      // Processes title tags in the feed. 
      private String readTitle(XmlPullParser parser) throws IOException, XmlPullParserException { 
       parser.require(XmlPullParser.START_TAG, ns, "title"); 

       String title = readText(parser); 
       parser.require(XmlPullParser.END_TAG, ns, "title"); 
       Log.i("..............",title); 
       return title; 
      } 

      // Processes link tags in the feed. 
      private String readLink(XmlPullParser parser) throws IOException, XmlPullParserException { 
       String link = ""; 
       parser.require(XmlPullParser.START_TAG, ns, "link"); 

//    String tag = parser.getName(); 
       link =readText(parser); 
//    String relType = parser.getAttributeValue(null, "rel"); 
//    if (tag.equals("link")) { 
//     if (relType.equals("alternate")){ 
//      link = parser.getAttributeValue(null, "href"); 
//      parser.nextTag(); 
//     } 
//    } 
       parser.require(XmlPullParser.END_TAG, ns, "link"); 
       Log.i("..............",link); 
       // map.put(KEY_LINK, link); 
       return link; 
      } 

      // For the tags title and summary, extracts their text values. 
      private String readText(XmlPullParser parser) throws IOException, XmlPullParserException { 
       String result = ""; 
       if (parser.next() == XmlPullParser.TEXT) { 
        result = parser.getText(); 
        parser.nextTag(); 
       } 
       return result; 
      } 


private void skip(XmlPullParser parser) throws XmlPullParserException, IOException { 
     if (parser.getEventType() != XmlPullParser.START_TAG) { 
      throw new IllegalStateException(); 
     } 
     int depth = 1; 
     while (depth != 0) { 
      switch (parser.next()) { 
      case XmlPullParser.END_TAG: 
       depth--; 
       break; 
      case XmlPullParser.START_TAG: 
       depth++; 
       break; 
      } 
     } 
    } 
} 

my_fraagment1.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context="com.iklikla.codetechblog.FrontpageActivity$PlaceholderFragment" 
    > 

    <ListView 
    android:id="@android:id/list" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
/> 

</RelativeLayout> 

Entry.java

public class Entry { 
    public final String title; 
    public final String link; 

    Entry(String title, String link) { 
     this.title = title; 
     this.link = link; 
    } 
} 

CustomAdapter

public class CustomAdapter extends BaseAdapter { 


    private LayoutInflater minflater; 
    ArrayList<Entry> entry; 
    public CustomAdapter(Context context, ArrayList<Entry> result) { 
     // TODO Auto-generated constructor stub 
     minflater = LayoutInflater.from(context); 
     this.entry=result; 
    } 

    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return entry.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     // TODO Auto-generated method stub 
     return position; 
    } 

    @Override 
    public long getItemId(int position) { 
     // TODO Auto-generated method stub 
     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     // TODO Auto-generated method stub 
     ViewHolder holder; 
     if(convertView==null) 
     { 
      convertView =minflater.inflate(R.layout.list_item, parent,false); 
      holder = new ViewHolder(); 
      holder.tv1 = (TextView) convertView.findViewById(R.id.textView1); 
      holder.tv2 = (TextView) convertView.findViewById(R.id.textView2); 
      convertView.setTag(holder); 
     } 
     else 
     { 
      holder= (ViewHolder) convertView.getTag(); 
     } 
     holder.tv1.setText(entry.get(position).title); 
     holder.tv2.setText(entry.get(position).link); 
     return convertView; 
    } 
static class ViewHolder 
{ 
    TextView tv1,tv2; 
} 
} 

list_item.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="match_parent" > 

    <TextView 
     android:id="@+id/textView1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentTop="true" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="43dp" 
     android:text="TextView" /> 

    <TextView 
     android:id="@+id/textView2" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignRight="@+id/textView1" 
     android:layout_below="@+id/textView1" 
     android:layout_marginTop="38dp" 
     android:text="TextView" /> 

</RelativeLayout> 

Snap Shot