ContactStatusLoader.java revision 6f96c779cf572b1680c2cbd68ae9858ca78f101e 
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 android.content.AsyncTaskLoader;
20import android.content.ContentUris;
21import android.content.Context;
22import android.database.Cursor;
23import android.graphics.Bitmap;
24import android.graphics.BitmapFactory;
25import android.net.Uri;
26import android.provider.ContactsContract.CommonDataKinds.Email;
27import android.provider.ContactsContract.CommonDataKinds.Photo;
28import android.provider.ContactsContract.Contacts;
29import android.provider.ContactsContract.Data;
30import android.provider.ContactsContract.StatusUpdates;
31import android.util.Log;
32
33import com.android.emailcommon.Logging;
34import com.android.emailcommon.utility.Utility;
35
36/**
37 * Loader to load presence statuses and the contact photo.
38 */
39public class ContactStatusLoader extends AsyncTaskLoader<ContactStatusLoader.Result> {
40    private static final int PRESENCE_UNKNOWN_RESOURCE_ID = android.R.drawable.presence_offline;
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        public boolean isUnknown() {
81            return PRESENCE_UNKNOWN_RESOURCE_ID == mPresenceResId;
82        }
83    }
84
85    public ContactStatusLoader(Context context, String emailAddress) {
86        super(context);
87        mContext = context;
88        mEmailAddress = emailAddress;
89    }
90
91    @Override
92    public Result loadInBackground() {
93        return getContactInfo(mContext, mEmailAddress);
94    }
95
96    /**
97     * Synchronously loads contact data.
98     *
99     * NOTE: DO NOT CALL THIS METHOD FROM THE UI THREAD (DATABASE ACCESS)
100     */
101    public static Result getContactInfo(Context context, String emailAddress) {
102        // Load photo-id and presence status.
103        Uri uri = Uri.withAppendedPath(Email.CONTENT_LOOKUP_URI, Uri.encode(emailAddress));
104        Cursor c = context.getContentResolver().query(
105                uri,
106                PROJECTION_PHOTO_ID_PRESENCE, null, null, null);
107        if (c == null) {
108            return Result.UNKNOWN;
109        }
110        final long photoId;
111        final int presenceStatus;
112        try {
113            if (!c.moveToFirst()) {
114                return Result.UNKNOWN;
115            }
116            photoId = c.getLong(COLUMN_PHOTO_ID);
117            presenceStatus = c.getInt(COLUMN_PRESENCE);
118        } finally {
119            c.close();
120        }
121
122        // Convert presence status into the res id.
123        final int presenceStatusResId = StatusUpdates.getPresenceIconResourceId(presenceStatus);
124
125        // load photo from photo-id.
126        Bitmap photo = null;
127        if (photoId != -1) {
128            final byte[] photoData = Utility.getFirstRowBlob(context,
129                    ContentUris.withAppendedId(Data.CONTENT_URI, photoId), PHOTO_PROJECTION,
130                    null, null, null, PHOTO_COLUMN, null);
131            if (photoData != null) {
132                try {
133                    photo = BitmapFactory.decodeByteArray(photoData, 0, photoData.length, null);
134                } catch (OutOfMemoryError e) {
135                    Log.d(Logging.LOG_TAG, "Decoding bitmap failed with " + e.getMessage());
136                }
137            }
138        }
139
140        // Get lookup URI
141        final Uri lookupUri = Data.getContactLookupUri(context.getContentResolver(), uri);
142        return new Result(photo, presenceStatusResId, lookupUri);
143    }
144
145    @Override
146    protected void onStartLoading() {
147        cancelLoad();
148        forceLoad();
149    }
150
151    @Override
152    protected void onStopLoading() {
153        cancelLoad();
154    }
155
156    @Override
157    protected void onReset() {
158        stopLoading();
159    }
160}
161