1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.example.android.apis.view;
18
19import android.app.ExpandableListActivity;
20import android.content.AsyncQueryHandler;
21import android.content.ContentUris;
22import android.content.Context;
23import android.database.Cursor;
24import android.net.Uri;
25import android.os.Bundle;
26import android.provider.ContactsContract.CommonDataKinds.Phone;
27import android.provider.ContactsContract.Contacts;
28import android.widget.CursorTreeAdapter;
29import android.widget.SimpleCursorTreeAdapter;
30
31/**
32 * Demonstrates expandable lists backed by Cursors
33 */
34public class ExpandableList2 extends ExpandableListActivity {
35
36    private static final String[] CONTACTS_PROJECTION = new String[] {
37        Contacts._ID,
38        Contacts.DISPLAY_NAME
39    };
40    private static final int GROUP_ID_COLUMN_INDEX = 0;
41
42    private static final String[] PHONE_NUMBER_PROJECTION = new String[] {
43            Phone._ID,
44            Phone.NUMBER
45    };
46
47    private static final int TOKEN_GROUP = 0;
48    private static final int TOKEN_CHILD = 1;
49
50    private static final class QueryHandler extends AsyncQueryHandler {
51        private CursorTreeAdapter mAdapter;
52
53        public QueryHandler(Context context, CursorTreeAdapter adapter) {
54            super(context.getContentResolver());
55            this.mAdapter = adapter;
56        }
57
58        @Override
59        protected void onQueryComplete(int token, Object cookie, Cursor cursor) {
60            switch (token) {
61            case TOKEN_GROUP:
62                mAdapter.setGroupCursor(cursor);
63                break;
64
65            case TOKEN_CHILD:
66                int groupPosition = (Integer) cookie;
67                mAdapter.setChildrenCursor(groupPosition, cursor);
68                break;
69            }
70        }
71    }
72
73    public class MyExpandableListAdapter extends SimpleCursorTreeAdapter {
74
75        // Note that the constructor does not take a Cursor. This is done to avoid querying the
76        // database on the main thread.
77        public MyExpandableListAdapter(Context context, int groupLayout,
78                int childLayout, String[] groupFrom, int[] groupTo, String[] childrenFrom,
79                int[] childrenTo) {
80
81            super(context, null, groupLayout, groupFrom, groupTo, childLayout, childrenFrom,
82                    childrenTo);
83        }
84
85        @Override
86        protected Cursor getChildrenCursor(Cursor groupCursor) {
87            // Given the group, we return a cursor for all the children within that group
88
89            // Return a cursor that points to this contact's phone numbers
90            Uri.Builder builder = Contacts.CONTENT_URI.buildUpon();
91            ContentUris.appendId(builder, groupCursor.getLong(GROUP_ID_COLUMN_INDEX));
92            builder.appendEncodedPath(Contacts.Data.CONTENT_DIRECTORY);
93            Uri phoneNumbersUri = builder.build();
94
95            mQueryHandler.startQuery(TOKEN_CHILD, groupCursor.getPosition(), phoneNumbersUri,
96                    PHONE_NUMBER_PROJECTION, Phone.MIMETYPE + "=?",
97                    new String[] { Phone.CONTENT_ITEM_TYPE }, null);
98
99            return null;
100        }
101    }
102
103    private QueryHandler mQueryHandler;
104    private CursorTreeAdapter mAdapter;
105
106    @Override
107    public void onCreate(Bundle savedInstanceState) {
108        super.onCreate(savedInstanceState);
109
110        // Set up our adapter
111        mAdapter = new MyExpandableListAdapter(
112                this,
113                android.R.layout.simple_expandable_list_item_1,
114                android.R.layout.simple_expandable_list_item_1,
115                new String[] { Contacts.DISPLAY_NAME }, // Name for group layouts
116                new int[] { android.R.id.text1 },
117                new String[] { Phone.NUMBER }, // Number for child layouts
118                new int[] { android.R.id.text1 });
119
120        setListAdapter(mAdapter);
121
122        mQueryHandler = new QueryHandler(this, mAdapter);
123
124        // Query for people
125        mQueryHandler.startQuery(TOKEN_GROUP, null, Contacts.CONTENT_URI, CONTACTS_PROJECTION,
126                Contacts.HAS_PHONE_NUMBER + "=1", null, null);
127    }
128
129    @Override
130    protected void onDestroy() {
131        super.onDestroy();
132
133        // Null out the group cursor. This will cause the group cursor and all of the child cursors
134        // to be closed.
135        mAdapter.changeCursor(null);
136        mAdapter = null;
137    }
138}
139