Eu faço uma solicitação paraandroid e estou usando o CursorTreeAdapter como ExpandableListView. Agora quero usar a caixa de pesquisa para exibir os itens filtrados do ExpandableListView. Como isso:

Aqui está o código que eu tenho até agora:

MainActivity.java:

package com.example.cursortreeadaptersearch;

import java.util.HashMap;

import android.app.SearchManager;
import android.content.Context;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.provider.ContactsContract;
import android.support.v4.app.LoaderManager;
import android.support.v4.app.LoaderManager.LoaderCallbacks;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.util.Log;
import android.widget.ExpandableListView;
import android.widget.SearchView;
import android.widget.SearchView.OnCloseListener;
import android.widget.SearchView.OnQueryTextListener;

import com.actionbarsherlock.app.SherlockFragmentActivity;

public class MainActivity extends SherlockFragmentActivity {

    private SearchView search;
    private MyListAdapter listAdapter;
    private ExpandableListView myList;

    private final String DEBUG_TAG = getClass().getSimpleName().toString();

    /**
     * The columns we are interested in from the database
     */
    static final String[] CONTACTS_PROJECTION = new String[] {
            ContactsContract.Contacts._ID,
            ContactsContract.Contacts.DISPLAY_NAME,
            ContactsContract.Contacts.PHOTO_ID,
            ContactsContract.CommonDataKinds.Email.DATA,
            ContactsContract.CommonDataKinds.Photo.CONTACT_ID };

    static final String[] GROUPS_SUMMARY_PROJECTION = new String[] {
            ContactsContract.Groups.TITLE, ContactsContract.Groups._ID,
            ContactsContract.Groups.SUMMARY_COUNT,
            ContactsContract.Groups.ACCOUNT_NAME,
            ContactsContract.Groups.ACCOUNT_TYPE,
            ContactsContract.Groups.DATA_SET };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
        search = (SearchView) findViewById(R.id.search);
        search.setSearchableInfo(searchManager
                .getSearchableInfo(getComponentName()));
        search.setIconifiedByDefault(false);
        search.setOnQueryTextListener(new OnQueryTextListener() {

            @Override
            public boolean onQueryTextSubmit(String query) {
                listAdapter.filterList(query);
                expandAll();
                return false;
            }

            @Override
            public boolean onQueryTextChange(String query) {
                listAdapter.filterList(query);
                expandAll();
                return false;
            }
        });

        search.setOnCloseListener(new OnCloseListener() {

            @Override
            public boolean onClose() {
                listAdapter.filterList("");
                expandAll();
                return false;
            }
        });

        // get reference to the ExpandableListView
        myList = (ExpandableListView) findViewById(R.id.expandableList);
        // create the adapter
        listAdapter = new MyListAdapter(null, MainActivity.this);
        // attach the adapter to the list
        myList.setAdapter(listAdapter);

        Loader<Cursor> loader = getSupportLoaderManager().getLoader(-1);
        if (loader != null && !loader.isReset()) {
            runOnUiThread(new Runnable() {
                public void run() {
                    getSupportLoaderManager().restartLoader(-1, null,
                            mSpeakersLoaderCallback);
                }
            });
        } else {
            runOnUiThread(new Runnable() {
                public void run() {
                    getSupportLoaderManager().initLoader(-1, null,
                            mSpeakersLoaderCallback).forceLoad();
                    ;
                }
            });
        }

    }

    @Override
    public void onResume() {
        super.onResume();

        getApplicationContext().getContentResolver().registerContentObserver(
                ContactsContract.Data.CONTENT_URI, true,
                mSpeakerChangesObserver);
    }

    @Override
    public void onPause() {
        super.onPause();

        getApplicationContext().getContentResolver().unregisterContentObserver(
                mSpeakerChangesObserver);
    }

    // method to expand all groups
    private void expandAll() {
        int count = listAdapter.getGroupCount();
        for (int i = 0; i < count; i++) {
            myList.expandGroup(i);
        }
    }

    public LoaderManager.LoaderCallbacks<Cursor> mSpeakersLoaderCallback = new LoaderCallbacks<Cursor>() {

        @Override
        public Loader<Cursor> onCreateLoader(int id, Bundle args) {
            Log.d(DEBUG_TAG, "onCreateLoader for loader_id " + id);
            CursorLoader cl = null;

            HashMap<Integer, Integer> groupMap = listAdapter.getGroupMap();
            if (id != -1) {
                int groupPos = groupMap.get(id);
                if (groupPos == 0) { // E-mail group
                    String[] PROJECTION = new String[] {
                            ContactsContract.RawContacts._ID,
                            ContactsContract.CommonDataKinds.Email.DATA };
                    String sortOrder = "CASE WHEN "
                            + ContactsContract.Contacts.DISPLAY_NAME
                            + " NOT LIKE '%@%' THEN 1 ELSE 2 END, "
                            + ContactsContract.Contacts.DISPLAY_NAME + ", "
                            + ContactsContract.CommonDataKinds.Email.DATA
                            + " COLLATE NOCASE";
                    String selection = ContactsContract.CommonDataKinds.Email.DATA
                            + " NOT LIKE ''";
                    cl = new CursorLoader(getApplicationContext(),
                            ContactsContract.CommonDataKinds.Email.CONTENT_URI,
                            PROJECTION, selection, null, sortOrder);
                } else if (groupPos == 1) { // Name group
                    Uri contactsUri = ContactsContract.Data.CONTENT_URI;
                    String selection = "(("
                            + ContactsContract.CommonDataKinds.GroupMembership.DISPLAY_NAME
                            + " NOTNULL) AND ("
                            + ContactsContract.CommonDataKinds.GroupMembership.HAS_PHONE_NUMBER
                            + "=1) AND ("
                            + ContactsContract.CommonDataKinds.GroupMembership.DISPLAY_NAME
                            + " != '') AND ("
                            + ContactsContract.CommonDataKinds.GroupMembership.GROUP_ROW_ID
                            + " = '1' ))"; // Row ID 1 == All contacts
                    String sortOrder = ContactsContract.CommonDataKinds.GroupMembership.DISPLAY_NAME
                            + " COLLATE LOCALIZED ASC";

                    cl = new CursorLoader(getApplicationContext(), contactsUri,
                            CONTACTS_PROJECTION, selection, null, sortOrder);
                }
            } else {
                // group cursor
                Uri groupsUri = ContactsContract.Groups.CONTENT_SUMMARY_URI;
                String selection = "((" + ContactsContract.Groups.TITLE
                        + " NOTNULL) AND (" + ContactsContract.Groups.TITLE
                        + " == 'Coworkers' ) OR ("
                        + ContactsContract.Groups.TITLE
                        + " == 'My Contacts' ))"; // Select only Coworkers
                                                 // (E-mail only) and My
                                                // Contacts (Name only)
                String sortOrder = ContactsContract.Groups.TITLE
                        + " COLLATE LOCALIZED ASC";
                cl = new CursorLoader(getApplicationContext(), groupsUri,
                        GROUPS_SUMMARY_PROJECTION, selection, null, sortOrder);
            }

            return cl;
        }

        @Override
        public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
            // Swap the new cursor in.
            int id = loader.getId();
//          Log.d("Dump Cursor MainActivity",
//                  DatabaseUtils.dumpCursorToString(data));
            Log.d(DEBUG_TAG, "onLoadFinished() for loader_id " + id);
            if (id != -1) {
                // child cursor
                if (!data.isClosed()) {
                    Log.d(DEBUG_TAG, "data.getCount() " + data.getCount());

                    HashMap<Integer, Integer> groupMap = listAdapter
                            .getGroupMap();
                    try {
                        int groupPos = groupMap.get(id);
                        Log.d(DEBUG_TAG, "onLoadFinished() for groupPos "
                                + groupPos);
                        listAdapter.setChildrenCursor(groupPos, data);
                    } catch (NullPointerException e) {
                        Log.w("DEBUG",
                                "Adapter expired, try again on the next query: "
                                        + e.getMessage());
                    }
                }
            } else {
                listAdapter.setGroupCursor(data);
            }
        }

        @Override
        public void onLoaderReset(Loader<Cursor> loader) {
            // This is called when the last Cursor provided to onLoadFinished()
            // is about to be closed.
            int id = loader.getId();
            Log.d(DEBUG_TAG, "onLoaderReset() for loader_id " + id);
            if (id != 1) {
                // child cursor
                try {
                    listAdapter.setChildrenCursor(id, null);
                } catch (NullPointerException e) {
                    Log.w(DEBUG_TAG,
                            "Adapter expired, try again on the next query: "
                                    + e.getMessage());
                }
            } else {
                listAdapter.setGroupCursor(null);
            }
        }
    };

    private ContentObserver mSpeakerChangesObserver = new ContentObserver(
            new Handler()) {

        @Override
        public void onChange(boolean selfChange) {
            if (getApplicationContext() != null) {
                runOnUiThread(new Runnable() {
                    public void run() {
                        getSupportLoaderManager().restartLoader(-1, null,
                                mSpeakersLoaderCallback);
                    }
                });
            }
        }
    };
}

MyListAdapter.java:

package com.example.cursortreeadaptersearch;

import java.util.HashMap;

import android.content.Context;
import android.database.Cursor;
import android.provider.ContactsContract;
import android.support.v4.content.Loader;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CursorTreeAdapter;
import android.widget.TextView;

public class MyListAdapter extends CursorTreeAdapter {

    public HashMap<String, View> childView = new HashMap<String, View>();

    /**
     * The columns we are interested in from the database
     */

    private final String DEBUG_TAG = getClass().getSimpleName().toString();

    protected final HashMap<Integer, Integer> mGroupMap;

    private MainActivity mActivity;
    private LayoutInflater mInflater;

    String mConstraint;

    public MyListAdapter(Cursor cursor, Context context) {

        super(cursor, context);
        mActivity = (MainActivity) context;
        mInflater = LayoutInflater.from(context);
        mGroupMap = new HashMap<Integer, Integer>();
    }

    @Override
    public View newGroupView(Context context, Cursor cursor,
            boolean isExpanded, ViewGroup parent) {

        final View view = mInflater.inflate(R.layout.list_group, parent, false);
        return view;
    }

    @Override
    public void bindGroupView(View view, Context context, Cursor cursor,
            boolean isExpanded) {

        TextView lblListHeader = (TextView) view
                .findViewById(R.id.lblListHeader);

        if (lblListHeader != null) {
            lblListHeader.setText(cursor.getString(cursor
                    .getColumnIndex(ContactsContract.Groups.TITLE)));
        }
    }

    @Override
    public View newChildView(Context context, Cursor cursor,
            boolean isLastChild, ViewGroup parent) {

        final View view = mInflater.inflate(R.layout.list_item, parent, false);

        return view;
    }

    @Override
    public void bindChildView(View view, Context context, Cursor cursor,
            boolean isLastChild) {

        TextView txtListChild = (TextView) view.findViewById(R.id.lblListItem);

        if (txtListChild != null) {
            txtListChild.setText(cursor.getString(1)); // Selects E-mail or
                                                        // Display Name
        }

    }

    protected Cursor getChildrenCursor(Cursor groupCursor) {
        // Given the group, we return a cursor for all the children within that
        // group
        int groupPos = groupCursor.getPosition();
        int groupId = groupCursor.getInt(groupCursor
                .getColumnIndex(ContactsContract.Groups._ID));

        Log.d(DEBUG_TAG, "getChildrenCursor() for groupPos " + groupPos);
        Log.d(DEBUG_TAG, "getChildrenCursor() for groupId " + groupId);

        mGroupMap.put(groupId, groupPos);

        Loader loader = mActivity.getSupportLoaderManager().getLoader(groupId);
        if (loader != null && !loader.isReset()) {
            mActivity.getSupportLoaderManager().restartLoader(groupId, null,
                    mActivity.mSpeakersLoaderCallback);
        } else {
            mActivity.getSupportLoaderManager().initLoader(groupId, null,
                    mActivity.mSpeakersLoaderCallback);
        }

        return null;
    }

    // Access method
    public HashMap<Integer, Integer> getGroupMap() {
        return mGroupMap;
    }

    public void filterList(CharSequence constraint) {
        // TODO Filter the data here
    }
}

Eu consideravelmente simplifiquei e limpei o código (para que vocês não precisem fazer).

Como você pode ver, eu tenho no total 3 cursores (1 para os grupos e 2 para as crianças). Os dados são obtidos deContatosContrato (quais são os contatos do usuário). O cursor do filho 1 representa todos os e-mails de todos os contatos e o cursor do filho 2 representa todos os nomes de exibição dos contatos. (A maioria das funções do carregador é deAqui).

A única coisa é agora como faço para implementar uma pesquisa? Devo fazê-lo através de Provedor de Conteúdo ou uma consulta bruta no banco de dados? Eu gostaria que os resultados de ambas as tabelas de filhos é exibido. Eu acho que é fácil fazer uma falha ao digitartokenize=porter é uma opção no meu caso.

Espero que alguém possa me apontar em uma boa direção.

Editar:

Eu tentei isso emMyListAdapter.java (comFilterQueryProvider como sugerido porKyle I.):

public void filterList(CharSequence constraint) {
    final Cursor oldCursor = getCursor();
    setFilterQueryProvider(filterQueryProvider);
    getFilter().filter(constraint, new FilterListener() {
        public void onFilterComplete(int count) {
            // assuming your activity manages the Cursor 
            // (which is a recommended way)
            notifyDataSetChanged();
//          stopManagingCursor(oldCursor);
//          final Cursor newCursor = getCursor();
//          startManagingCursor(newCursor);
//          // safely close the oldCursor
            if (oldCursor != null && !oldCursor.isClosed()) {
                oldCursor.close();
            }
        }
    });
}

private FilterQueryProvider filterQueryProvider = new FilterQueryProvider() {
    public Cursor runQuery(CharSequence constraint) {
        // assuming you have your custom DBHelper instance 
        // ready to execute the DB request
        String s = '%' + constraint.toString() + '%';
        return mActivity.getContentResolver().query(ContactsContract.Data.CONTENT_URI,
                MainActivity.CONTACTS_PROJECTION,
                ContactsContract.CommonDataKinds.GroupMembership.DISPLAY_NAME + " LIKE ?",
            new String[] { s },
            null);
    }
};

E isso emMainActivity.java:

        search.setOnQueryTextListener(new OnQueryTextListener() {

            @Override
            public boolean onQueryTextSubmit(String query) {
                listAdapter.filterList(query);
                expandAll();
                return false;
            }

            @Override
            public boolean onQueryTextChange(String query) {
                listAdapter.filterList(query);
                expandAll();
                return false;
            }
        });

        search.setOnCloseListener(new OnCloseListener() {

            @Override
            public boolean onClose() {
                listAdapter.filterList("");
                expandAll();
                return false;
            }
        });

Mas então eu recebo esses erros quando tento pesquisar:

12-20 13:20:19.449: E/CursorWindow(28747): Failed to read row 0, column -1 from a CursorWindow which has 96 rows, 4 columns.
12-20 13:20:19.449: D/AndroidRuntime(28747): Shutting down VM
12-20 13:20:19.449: W/dalvikvm(28747): threadid=1: thread exiting with uncaught exception (group=0x415c62a0)
12-20 13:20:19.499: E/AndroidRuntime(28747): FATAL EXCEPTION: main
12-20 13:20:19.499: E/AndroidRuntime(28747): java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow.  Make sure the Cursor is initialized correctly before accessing data from it.

O que estou fazendo errado? Ou isso é porque eu sou apenas uma consulta de retorno (nomes de exibição) em vez de 2 (exibir nomes e e-mails) emrunQuery?

Editar 2:

Primeiro de tudo eu mudei todas as minhas implementações de banco de dados paraContatosContrato. Isso fica mais fácil de manter, para que você não precise escrever sua própria implementação de banco de dados.

O que eu tentei agora é salvar minha restriçãorunQuery() doFilterQueryProvidere depois emgetChildrenCursor executar uma consulta contra essa restrição. (como sugerido porJRaymond)

private String mConstraint;
protected Cursor getChildrenCursor(Cursor groupCursor) {
    // Given the group, we return a cursor for all the children within that
    // group
    int groupPos = groupCursor.getPosition();
    int groupId = groupCursor.getInt(groupCursor
            .getColumnIndex(ContactsContract.Groups._ID));

    Log.d(DEBUG_TAG, "getChildrenCursor() for groupPos " + groupPos);
    Log.d(DEBUG_TAG, "getChildrenCursor() for groupId " + groupId);

    mGroupMap.put(groupId, groupPos);

    Bundle b = new Bundle();
    b.putString("constraint", mConstraint);

    Loader loader = mActivity.getSupportLoaderManager().getLoader(groupId);
    if (loader != null && !loader.isReset()) {
        if (mConstraint == null || mConstraint.isEmpty()) {
            // Normal query
            mActivity.getSupportLoaderManager().restartLoader(groupId,
                    null, mActivity.mSpeakersLoaderCallback);
        } else {
            // Constrained query
            mActivity.getSupportLoaderManager().restartLoader(groupId, b,
                    mActivity.mSpeakersLoaderCallback);

        }
    } else {
        if (mConstraint == null || mConstraint.isEmpty()) {
            // Normal query
            mActivity.getSupportLoaderManager().initLoader(groupId, null,
                    mActivity.mSpeakersLoaderCallback);
        } else {
            // Constrained query
            mActivity.getSupportLoaderManager().initLoader(groupId, b,
                    mActivity.mSpeakersLoaderCallback);
        }
    }

    return null;
}

E aqui está oFilterQueryProvider:

private FilterQueryProvider filterQueryProvider = new FilterQueryProvider() {
    public Cursor runQuery(CharSequence constraint) {
        // Load the group cursor here and assign mConstraint
        mConstraint = constraint.toString();
        Uri groupsUri = ContactsContract.Groups.CONTENT_SUMMARY_URI;
        String selection = "((" + ContactsContract.Groups.TITLE
                + " NOTNULL) AND (" + ContactsContract.Groups.TITLE
                + " == 'Coworkers' ) OR (" + ContactsContract.Groups.TITLE
                + " == 'My Contacts' ))"; // Select only Coworkers
                                            // (E-mail only) and My
                                            // Contacts (Name only)
        String sortOrder = ContactsContract.Groups.TITLE
                + " COLLATE LOCALIZED ASC";
        return mActivity.getContentResolver().query(groupsUri,
                MainActivity.GROUPS_SUMMARY_PROJECTION, selection, null,
                sortOrder);
    }
};

Como você pode ver, carrego a consulta dos grupos para obter ogetChildrenCursor trabalhando. Apenas o que para consulta devo executar emMainActivity que eu recebo do pacote?

O projeto pode ser baixadoAqui, que você pode importar no Eclipse.