片段更改时如何更新视图？

Question

我的活动中有2个sherlockfragment 前两页显示具有自定义列表视图的片段，这些视图是使用AsyncTask从服务器的xml构建的。但是，当应用程序运行时，只显示一个列表视图，另一个页面只是空白

public class VpiAbsTestActivity extends SherlockFragmentActivity {


private static final String[] CONTENT = new String[] { "1","2"};

TestFragmentAdapter mAdapter;
 ViewPager mPager;
    PageIndicator mIndicator;



protected void onCreate(Bundle savedInstanceState) {
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.simple_tabs);

    mAdapter = new TestFragmentAdapter(getSupportFragmentManager());
    mPager = (ViewPager)findViewById(R.id.pager);
    mPager.setAdapter(mAdapter);

    mIndicator = (TabPageIndicator)findViewById(R.id.indicator);
    mIndicator.setViewPager(mPager);
    mIndicator.notifyDataSetChanged();
}



class TestFragmentAdapter extends FragmentPagerAdapter {        
    private int mCount = CONTENT.length;

    public TestFragmentAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        switch(position) {

        case 0:
            return new customlist();


        case 1:
            return new customlistnotuser();


        default:
            return null;

        }
    }

    @Override
    public int getCount() {
        return mCount;
    }


    public CharSequence getPageTitle(int position) {
        return VpiAbsTestActivity.CONTENT[position % VpiAbsTestActivity.CONTENT.length].toUpperCase();
    }

     @Override
        public void destroyItem(View collection, int position, Object view) {
             ((ViewPager) collection).removeView((View) view);
        }

 }

}

更改页面时我可以更新viewpager吗？

customlistnotuser页面喜欢自定义列表页面但不显示

 public class customlistnotuser extends SherlockFragment  {

// All static variables
static final String URL = "url";
// XML node keys
static final String KEY_TEST = "test"; // parent node
static final String KEY_ID = "id";
static final String KEY_TITLE = "title";
static final String KEY_Description = "description";
static final String KEY_DURATION = "duration";
static final String KEY_THUMB_URL = "thumb_url";
static final String KEY_PRICE = "price";
static final String KEY_URL = "url";



 private ProgressDialog pDialog;


ListView list;
LazyAdapterbeth adapter;
XMLParser parser = new XMLParser();
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);


}



public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    new getFeed().execute();

}

public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) 

{

    View thisfragment = inflater.inflate(R.layout.dovomi, container, false);

    return thisfragment;
}



private class getFeed extends AsyncTask<Void, Void, Document> {



       }

    protected Document doInBackground(Void... params) {

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

        return doc;
    }

    protected void onPostExecute(Document doc) {

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

    NodeList nl = doc.getElementsByTagName(KEY_TEST);
    // looping through all song nodes <song>
    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_ID, parser.getValue(e, KEY_ID));
        map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE));
        map.put(KEY_Description, parser.getValue(e, KEY_Description));
        map.put(KEY_DURATION, parser.getValue(e, KEY_DURATION));
        map.put(KEY_THUMB_URL, parser.getValue(e, KEY_THUMB_URL));
        map.put(KEY_PRICE, parser.getValue(e, KEY_PRICE));
        map.put(KEY_URL, parser.getValue(e, KEY_URL));
        // adding HashList to ArrayList
        songsList.add(map);
         pDialog.dismiss();
    }



    list=(ListView)getActivity().findViewById(R.id.list);

    // Getting adapter by passing xml data ArrayList
    adapter=new LazyAdapterbeth(getActivity(), songsList);
    list.setAdapter(adapter);


    // Click event for single list row
    list.setOnItemClickListener(new OnItemClickListener() {

customlistnotuser页面喜欢自定义列表页面但不显示.. :(