ContactStatusLoader.java revision b1ea9c3c12d8d9da5c1e49a8752076ce60861e9f 
1/*
2 * Copyright (C) 2010 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.android.email.activity;
18
19import com.android.email.R;
20import com.android.email.Utility;
21
22import android.content.AsyncTaskLoader;
23import android.content.ContentUris;
24import android.content.Context;
25import android.database.Cursor;
26import android.graphics.Bitmap;
27import android.graphics.BitmapFactory;
28import android.net.Uri;
29import android.provider.ContactsContract.CommonDataKinds.Email;
30import android.provider.ContactsContract.CommonDataKinds.Photo;
31import android.provider.ContactsContract.Contacts;
32import android.provider.ContactsContract.Data;
33import android.provider.ContactsContract.StatusUpdates;
34
35/**
36 * Loader to load presence statuses and the contact photoes.
37 */
38public class ContactStatusLoader extends AsyncTaskLoader<ContactStatusLoader.Result> {
39    public static final int PRESENCE_UNKNOWN_RESOURCE_ID = R.drawable.presence_inactive;
40
41    /** email address -> photo id, presence */
42    /* package */ static final String[] PROJECTION_PHOTO_ID_PRESENCE = new String[] {
43            Contacts.PHOTO_ID,
44            Contacts.CONTACT_PRESENCE
45            };
46    private static final int COLUMN_PHOTO_ID = 0;
47    private static final int COLUMN_PRESENCE = 1;
48
49    /** photo id -> photo data */
50    /* package */ static final String[] PHOTO_PROJECTION = new String[] {
51            Photo.PHOTO
52            };
53    private static final int PHOTO_COLUMN = 0;
54
55    private final Context mContext;
56    private final String mEmailAddress;
57
58    /**
59     * Class that encapsulates the result.
60     */
61    public static class Result {
62        public static final Result UNKNOWN = new Result(null, PRESENCE_UNKNOWN_RESOURCE_ID, null);
63
64        /** Contact photo.  Null if unknown */
65        public final Bitmap mPhoto;
66
67        /** Presence image resource ID.  Always has a valid value, even if unknown. */
68        public final int mPresenceResId;
69
70        /** URI for opening quick contact.  Null if unknown. */
71        public final Uri mLookupUri;
72
73        public Result(Bitmap photo, int presenceResId, Uri lookupUri) {
74            mPhoto = photo;
75            mPresenceResId = presenceResId;
76            mLookupUri = lookupUri;
77        }
78    }
79
80    public ContactStatusLoader(Context context, String emailAddress) {
81        super(context);
82        mContext = context;
83        mEmailAddress = emailAddress;
84    }
85
86    @Override
87    public Result loadInBackground() {
88        // Load photo-id and presence status.
89        Uri uri = Uri.withAppendedPath(Email.CONTENT_LOOKUP_URI, Uri.encode(mEmailAddress));
90        Cursor c = mContext.getContentResolver().query(
91                uri,
92                PROJECTION_PHOTO_ID_PRESENCE, null, null, null);
93        if (c == null) {
94            return Result.UNKNOWN;
95        }
96        final long photoId;
97        final int presenceStatus;
98        try {
99            if (!c.moveToFirst()) {
100                return Result.UNKNOWN;
101            }
102            photoId = c.getLong(COLUMN_PHOTO_ID);
103            presenceStatus = c.getInt(COLUMN_PRESENCE);
104        } finally {
105            c.close();
106        }
107
108        // Convert presence status into the res id.
109        final int presenceStatusResId = StatusUpdates.getPresenceIconResourceId(presenceStatus);
110
111        // load photo from photo-id.
112        Bitmap photo = null;
113        if (photoId != -1) {
114            final byte[] photoData = Utility.getFirstRowBlob(mContext,
115                    ContentUris.withAppendedId(Data.CONTENT_URI, photoId), PHOTO_PROJECTION,
116                    null, null, null, PHOTO_COLUMN, null);
117            if (photoData != null) {
118                photo = BitmapFactory.decodeByteArray(photoData, 0, photoData.length, null);
119            }
120        }
121
122        // Get lookup URI
123        final Uri lookupUri = Data.getContactLookupUri(mContext.getContentResolver(), uri);
124        return new Result(photo, presenceStatusResId, lookupUri);
125    }
126
127    @Override
128    public void startLoading() {
129        cancelLoad();
130        forceLoad();
131    }
132
133    @Override
134    public void stopLoading() {
135        cancelLoad();
136    }
137
138    @Override
139    public void destroy() {
140        stopLoading();
141    }
142}
143