// 准备装载器．可以重连一个已经存在的也可以启动一个新的．

getLoaderManager().initLoader(0,null, this);

public boolean onQueryTextChanged(String newText) {

    // 当动作栏的搜索字串发生改时被调用．

   // 更新搜索过虑，然后重新启动装载利用这个新过虑进行新的查询．

    mCurFilter = !TextUtils.isEmpty(newText) ? newText : null;

    getLoaderManager().restartLoader(0, null, this);

    return true;

}

 // If non-null, this is the current filter the user has provided.

String mCurFilter;

...

public Loader<Cursor> onCreateLoader(int id, Bundle args) {

    // This is called when a new Loader needs to be created.  This

    // sample only has one Loader, so we don't care about the ID.

    // First, pick the base URI to use depending on whether we are

    // currently filtering.

    Uri baseUri;

    if (mCurFilter != null) {

        baseUri = Uri.withAppendedPath(Contacts.CONTENT_FILTER_URI,

                  Uri.encode(mCurFilter));

    } else {

        baseUri = Contacts.CONTENT_URI;

    }

    // Now create and return a CursorLoader that will take care of

    // creating a Cursor for the data being displayed.

    String select = "((" + Contacts.DISPLAY_NAME + " NOTNULL) AND ("

            + Contacts.HAS_PHONE_NUMBER + "=1) AND ("

            + Contacts.DISPLAY_NAME + " != '' ))";

    return new CursorLoader(getActivity(), baseUri,

            CONTACTS_SUMMARY_PROJECTION, select, null,

            Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC");

}

// This is the Adapter being used to display the list's data.

SimpleCursorAdapter mAdapter;

...

public void onLoadFinished(Loader<Cursor> loader, Cursor data) {

    // Swap the new cursor in.  (The framework will take care of closing the

    // old cursor once we return.)

    mAdapter.swapCursor(data);

}

// This is the Adapter being used to display the list's data.

SimpleCursorAdapter mAdapter;

...

public void onLoaderReset(Loader<Cursor> loader) {

    // This is called when the last Cursor provided to onLoadFinished()

    // above is about to be closed.  We need to make sure we are no

    // longer using it.

    mAdapter.swapCursor(null);

} 

public static class CursorLoaderListFragment extends ListFragment

        implements OnQueryTextListener, LoaderManager.LoaderCallbacks<Cursor> {

    // This is the Adapter being used to display the list's data.

    SimpleCursorAdapter mAdapter;

    // If non-null, this is the current filter the user has provided.

    String mCurFilter;

    @Override public void onActivityCreated(Bundle savedInstanceState) {

        super.onActivityCreated(savedInstanceState);

        // Give some text to display if there is no data.  In a real

        // application this would come from a resource.

        setEmptyText("No phone numbers");

        // We have a menu item to show in action bar.

        setHasOptionsMenu(true);

        // Create an empty adapter we will use to display the loaded data.

        mAdapter = new SimpleCursorAdapter(getActivity(),

                android.R.layout.simple_list_item_2, null,

                new String[] { Contacts.DISPLAY_NAME, Contacts.CONTACT_STATUS },

                new int[] { android.R.id.text1, android.R.id.text2 }, 0);

        setListAdapter(mAdapter);

        // Prepare the loader.  Either re-connect with an existing one,

        // or start a new one.

        getLoaderManager().initLoader(0, null, this);

    }

    @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {

        // Place an action bar item for searching.

        MenuItem item = menu.add("Search");

        item.setIcon(android.R.drawable.ic_menu_search);

        item.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);

        SearchView sv = new SearchView(getActivity());

        sv.setOnQueryTextListener(this);

        item.setActionView(sv);

    }

    public boolean onQueryTextChange(String newText) {

        // Called when the action bar search text has changed.  Update

        // the search filter, and restart the loader to do a new query

        // with this filter.

        mCurFilter = !TextUtils.isEmpty(newText) ? newText : null;

        getLoaderManager().restartLoader(0, null, this);

        return true;

    }

    @Override public boolean onQueryTextSubmit(String query) {

        // Don't care about this.

        return true;

    }

    @Override public void onListItemClick(ListView l, View v, int position, long id) {

        // Insert desired behavior here.

        Log.i("FragmentComplexList", "Item clicked: " + id);

    }

    // These are the Contacts rows that we will retrieve.

    static final String[] CONTACTS_SUMMARY_PROJECTION = new String[] {

        Contacts._ID,

        Contacts.DISPLAY_NAME,

        Contacts.CONTACT_STATUS,

        Contacts.CONTACT_PRESENCE,

        Contacts.PHOTO_ID,

        Contacts.LOOKUP_KEY,

    };

    public Loader<Cursor> onCreateLoader(int id, Bundle args) {

        // This is called when a new Loader needs to be created.  This

        // sample only has one Loader, so we don't care about the ID.

        // First, pick the base URI to use depending on whether we are

        // currently filtering.

        Uri baseUri;

        if (mCurFilter != null) {

            baseUri = Uri.withAppendedPath(Contacts.CONTENT_FILTER_URI,

                    Uri.encode(mCurFilter));

        } else {

            baseUri = Contacts.CONTENT_URI;

        }

        // Now create and return a CursorLoader that will take care of

        // creating a Cursor for the data being displayed.

        String select = "((" + Contacts.DISPLAY_NAME + " NOTNULL) AND ("

                + Contacts.HAS_PHONE_NUMBER + "=1) AND ("

                + Contacts.DISPLAY_NAME + " != '' ))";

        return new CursorLoader(getActivity(), baseUri,

                CONTACTS_SUMMARY_PROJECTION, select, null,

                Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC");

    }

    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {

        // Swap the new cursor in.  (The framework will take care of closing the

        // old cursor once we return.)

        mAdapter.swapCursor(data);

    }

    public void onLoaderReset(Loader<Cursor> loader) {

        // This is called when the last Cursor provided to onLoadFinished()

        // above is about to be closed.  We need to make sure we are no

        // longer using it.

        mAdapter.swapCursor(null);

    }

}