ContactStatusLoader.java revision 8b9f2a7284337bfb23d5e2f8de9f1c70cb9532a1 
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;
34import android.util.Log;
35
36/**
37 * Loader to load presence statuses and the contact photoes.
38 */
39public class ContactStatusLoader extends AsyncTaskLoader<ContactStatusLoader.Result> {
40    public static final int PRESENCE_UNKNOWN_RESOURCE_ID = R.drawable.presence_inactive;
41
42    /** email address -> photo id, presence */
43    /* package */ static final String[] PROJECTION_PHOTO_ID_PRESENCE = new String[] {
44            Contacts.PHOTO_ID,
45            Contacts.CONTACT_PRESENCE
46            };
47    private static final int COLUMN_PHOTO_ID = 0;
48    private static final int COLUMN_PRESENCE = 1;
49
50    /** photo id -> photo data */
51    /* package */ static final String[] PHOTO_PROJECTION = new String[] {
52            Photo.PHOTO
53            };
54    private static final int PHOTO_COLUMN = 0;
55
56    private final Context mContext;
57    private final String mEmailAddress;
58
59    /**
60     * Class that encapsulates the result.
61     */
62    public static class Result {
63        public static final Result UNKNOWN = new Result(null, PRESENCE_UNKNOWN_RESOURCE_ID, null);
64
65        /** Contact photo.  Null if unknown */
66        public final Bitmap mPhoto;
67
68        /** Presence image resource ID.  Always has a valid value, even if unknown. */
69        public final int mPresenceResId;
70
71        /** URI for opening quick contact.  Null if unknown. */
72        public final Uri mLookupUri;
73
74        public Result(Bitmap photo, int presenceResId, Uri lookupUri) {
75            mPhoto = photo;
76            mPresenceResId = presenceResId;
77            mLookupUri = lookupUri;
78        }
79    }
80
81    public ContactStatusLoader(Context context, String emailAddress) {
82        super(context);
83        mContext = context;
84        mEmailAddress = emailAddress;
85    }
86
87    @Override
88    public Result loadInBackground() {
89        return load(mContext, mEmailAddress);
90    }
91
92    /**
93     * Load synchronously.
94     *
95     * Used to fetch a photo for notification, in which calls the callsite is already on a worker
96     * thread.
97     */
98    public static Result load(Context context, String emailAddress) {
99        // Load photo-id and presence status.
100        Uri uri = Uri.withAppendedPath(Email.CONTENT_LOOKUP_URI, Uri.encode(emailAddress));
101        Cursor c = context.getContentResolver().query(
102                uri,
103                PROJECTION_PHOTO_ID_PRESENCE, null, null, null);
104        if (c == null) {
105            return Result.UNKNOWN;
106        }
107        final long photoId;
108        final int presenceStatus;
109        try {
110            if (!c.moveToFirst()) {
111                return Result.UNKNOWN;
112            }
113            photoId = c.getLong(COLUMN_PHOTO_ID);
114            presenceStatus = c.getInt(COLUMN_PRESENCE);
115        } finally {
116            c.close();
117        }
118
119        // Convert presence status into the res id.
120        final int presenceStatusResId = StatusUpdates.getPresenceIconResourceId(presenceStatus);
121
122        // load photo from photo-id.
123        Bitmap photo = null;
124        if (photoId != -1) {
125            final byte[] photoData = Utility.getFirstRowBlob(context,
126                    ContentUris.withAppendedId(Data.CONTENT_URI, photoId), PHOTO_PROJECTION,
127                    null, null, null, PHOTO_COLUMN, null);
128            if (photoData != null) {
129                try {
130                    photo = BitmapFactory.decodeByteArray(photoData, 0, photoData.length, null);
131                } catch (OutOfMemoryError e) {
132                    Log.d(com.android.email.Email.LOG_TAG,
133                            "Decoding bitmap failed with " + e.getMessage());
134                }
135            }
136        }
137
138        // Get lookup URI
139        final Uri lookupUri = Data.getContactLookupUri(context.getContentResolver(), uri);
140        return new Result(photo, presenceStatusResId, lookupUri);
141    }
142
143    @Override
144    protected void onStartLoading() {
145        cancelLoad();
146        forceLoad();
147    }
148
149    @Override
150    protected void onStopLoading() {
151        cancelLoad();
152    }
153
154    @Override
155    protected void onReset() {
156        stopLoading();
157    }
158}
159