Question

描述 ::

有一个ActionBarTab(3-tab)设置，我们正在链接三个片段对于每个Action-Tab，每个片段包含listview
每当我们点击Tab时，我们都会对数据进行排序。
在onTabReselect我使用接口方法调用sort函数，没有错误，它会执行但不刷新listview

MainActivity.java

public class MainActivity extends Activity {
@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //Toast.makeText(this, DosUtils.ExecuteDOSCommand(), Toast.LENGTH_SHORT);

        // Initialize
        FindMyBuffetApplicationCls.initFindMyBuffetApplicationCls(MainActivity.this);

        setContentView(R.layout.main_activity);
        appContext = getApplicationContext();

        //ActionBar
        ActionBar actionbar = getActionBar();
        actionbar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        ActionBar.Tab RatingTab = actionbar.newTab().setText(FindMyBuffetConstants.TAB_NAME_RATING);
        ActionBar.Tab PriceTab = actionbar.newTab().setText(FindMyBuffetConstants.SORT_BY_PRICE);
        ActionBar.Tab DistanceTab = actionbar.newTab().setText(FindMyBuffetConstants.SORT_BY_DISTANCE);

        Fragment SortRestFragmentByRating = new SortRestaurantRating();
        Fragment SortRestFragmentByPrice = new SortRestaurantByPrice();
        Fragment SortRestFragmentByDistance = new SortRestaurantByDistance();

        RatingTab.setTabListener(new MyTabsListener(SortRestFragmentByRating));
        PriceTab.setTabListener(new MyTabsListener(SortRestFragmentByPrice));
        DistanceTab.setTabListener(new MyTabsListener(SortRestFragmentByDistance));

        actionbar.addTab(RatingTab);
        actionbar.addTab(PriceTab);
        actionbar.addTab(DistanceTab);

        FindMyBuffetApplicationCls.comm = (Communicator) new SortRestaurantByPrice();
    }
class MyTabsListener implements ActionBar.TabListener {
    public Fragment fragment;

    public MyTabsListener(Fragment fragment) {
        this.fragment = fragment;
    }

    @Override
    public void onTabReselected(Tab tab, FragmentTransaction ft) {
        if(tab.getText().toString()==FindMyBuffetConstants.TAB_NAME_RATING){
            if(FindMyBuffetApplicationCls.isRatingOrderByDesc==false){
                FindMyBuffetApplicationCls.isRatingOrderByDesc=true;
            }
            else {
                FindMyBuffetApplicationCls.isRatingOrderByDesc=false;
            }

        }

        if(tab.getText().toString()==FindMyBuffetConstants.SORT_BY_PRICE){
            if(FindMyBuffetApplicationCls.isPriceOrderByDesc==false){
                FindMyBuffetApplicationCls.isPriceOrderByDesc=true;
            }
            else {
                FindMyBuffetApplicationCls.isPriceOrderByDesc=false;
            }

            FindMyBuffetApplicationCls.comm.RefreshFragment();
        }

        if(tab.getText().toString()==FindMyBuffetConstants.SORT_BY_DISTANCE){
            if(FindMyBuffetApplicationCls.isDistanceOrderByDesc==false){
                FindMyBuffetApplicationCls.isDistanceOrderByDesc=true;
            }
            else {
                FindMyBuffetApplicationCls.isDistanceOrderByDesc=false;
            }
        }

    }

    @Override
    public void onTabSelected(Tab tab, FragmentTransaction ft) {

        ft.replace(R.id.main_container, fragment);
        if(tab.getText().toString()==FindMyBuffetConstants.TAB_NAME_RATING){
            if(FindMyBuffetApplicationCls.isRatingOrderByDesc==false)
                FindMyBuffetApplicationCls.isRatingOrderByDesc=true;
            else 
                FindMyBuffetApplicationCls.isRatingOrderByDesc=false;
        }

        if(tab.getText().toString()==FindMyBuffetConstants.SORT_BY_PRICE){
            if(FindMyBuffetApplicationCls.isPriceOrderByDesc==false)
                FindMyBuffetApplicationCls.isPriceOrderByDesc=true;
            else 
                FindMyBuffetApplicationCls.isPriceOrderByDesc=false;
        }

        if(tab.getText().toString()==FindMyBuffetConstants.SORT_BY_DISTANCE){
            if(FindMyBuffetApplicationCls.isDistanceOrderByDesc==false)
                FindMyBuffetApplicationCls.isDistanceOrderByDesc=true;
            else 
                FindMyBuffetApplicationCls.isDistanceOrderByDesc=false;
        }
    }

    @Override
    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        ft.remove(fragment);
        Log.i("TEST TAB",tab.getText().toString());

    }

}

SortRestaurantByPrice.java

public class SortRestaurantByPrice extends Fragment implements Communicator{
    // Declaration
    ListView xmlFragmentListView;
    SortRestaurantListViewAdapter listViewAdapter;
    View layout;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        layout = inflater.inflate(R.layout.sort_restaurant_by_price, container,false);
        xmlFragmentListView = ((ListView) layout.findViewById(R.id.sortrestaurantbypricelistview));
        return layout;
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        //layout = null; // now cleaning up!
    }

    private void SortRestaurantList(String strSortBy)
            throws Exception, TransformerConfigurationException,
            TransformerException, FindMyBuffetException {

        // Process the Main Screen Data
        List<RestaurantDetails> lstRest = null;     
                    lstRest = SAXXMLParser.parse(xmlInputStream);
                    SortRestaurantListViewAdapter listViewAdapter = new SortRestaurantListViewAdapter(lstRest);
                    xmlFragmentListView.setAdapter(listViewAdapter);

    }

    @Override
    public void RefreshFragment() {
        // TODO Auto-generated method stub
        Log.i("hELLO", "refresh requested. Try to reload data for this fragment...");
            SortRestaurantList("Price");

    }
}

Communicator.java

public interface Communicator {
    public void RefreshFragment();
}

Answer 1

请使用sortRestaurantList方法在列表中调用notifyDataChanged方法。

 private void SortRestaurantList(String strSortBy)
        throws Exception, TransformerConfigurationException,
        TransformerException, FindMyBuffetException {

    // Process the Main Screen Data
    List<RestaurantDetails> lstRest = null;     
                lstRest = SAXXMLParser.parse(xmlInputStream);
                SortRestaurantListViewAdapter listViewAdapter = new SortRestaurantListViewAdapter(lstRest);
                xmlFragmentListView.setAdapter(listViewAdapter);
       listViewAdapter.notifyDataSetChanged(); // call this on Adapter

}

事实上，在onCreateView方法中移动适配器代码。只修改（排序）SortRestaurant方法中的List lstRest，然后调用notifyDataSetChanged方法。

如何使用ActionBar选项卡在TabReselected上重新加载片段或刷新片段

1 个答案: