/* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package com.example.android.apis.view;import android.app.ExpandableListActivity;import android.content.ContentUris;import android.content.Context;import android.database.Cursor;import android.net.Uri;import android.os.Bundle;import android.provider.Contacts.People;import android.widget.ExpandableListAdapter;import android.widget.SimpleCursorTreeAdapter;/** * Demonstrates expandable lists backed by Cursors */public class ExpandableList2 extends ExpandableListActivity {    private int mGroupIdColumnIndex;         private String mPhoneNumberProjection[] = new String[] {            People.Phones._ID, People.Phones.NUMBER    };        private ExpandableListAdapter mAdapter;        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        // Query for people        Cursor groupCursor = managedQuery(People.CONTENT_URI,                new String[] {People._ID, People.NAME}, null, null, null);        // Cache the ID column index        mGroupIdColumnIndex = groupCursor.getColumnIndexOrThrow(People._ID);        // Set up our adapter        mAdapter = new MyExpandableListAdapter(groupCursor,                this,                android.R.layout.simple_expandable_list_item_1,                android.R.layout.simple_expandable_list_item_1,                new String[] {People.NAME}, // Name for group layouts                new int[] {android.R.id.text1},                new String[] {People.NUMBER}, // Number for child layouts                new int[] {android.R.id.text1});        setListAdapter(mAdapter);    }    public class MyExpandableListAdapter extends SimpleCursorTreeAdapter {        public MyExpandableListAdapter(Cursor cursor, Context context, int groupLayout,                int childLayout, String[] groupFrom, int[] groupTo, String[] childrenFrom,                int[] childrenTo) {            super(context, cursor, groupLayout, groupFrom, groupTo, childLayout, childrenFrom,                    childrenTo);        }        @Override        protected Cursor getChildrenCursor(Cursor groupCursor) {            // Given the group, we return a cursor for all the children within that group             // Return a cursor that points to this contact's phone numbers            Uri.Builder builder = People.CONTENT_URI.buildUpon();            ContentUris.appendId(builder, groupCursor.getLong(mGroupIdColumnIndex));            builder.appendEncodedPath(People.Phones.CONTENT_DIRECTORY);            Uri phoneNumbersUri = builder.build();            // The returned Cursor MUST be managed by us, so we use Activity's helper            // functionality to manage it for us.            return managedQuery(phoneNumbersUri, mPhoneNumberProjection, null, null, null);        }    }}