CellBroadcastConfigService.java revision 59610ad5074acb5305c353a53c01676eb8258887 
1/*
2 * Copyright (C) 2011 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.cellbroadcastreceiver;
18
19import android.app.IntentService;
20import android.content.Intent;
21import android.content.SharedPreferences;
22import android.content.res.Resources;
23import android.os.SystemProperties;
24import android.preference.PreferenceManager;
25import android.telephony.SmsCbConstants;
26import android.telephony.SmsManager;
27import android.text.TextUtils;
28import android.util.Log;
29
30import com.android.internal.telephony.gsm.SmsCbHeader;
31
32import static com.android.cellbroadcastreceiver.CellBroadcastReceiver.DBG;
33
34/**
35 * This service manages enabling and disabling ranges of message identifiers
36 * that the radio should listen for. It operates independently of the other
37 * services and runs at boot time and after exiting airplane mode.
38 *
39 * Note that the entire range of emergency channels is enabled. Test messages
40 * and lower priority broadcasts are filtered out in CellBroadcastAlertService
41 * if the user has not enabled them in settings.
42 *
43 * TODO: add notification to re-enable channels after a radio reset.
44 */
45public class CellBroadcastConfigService extends IntentService {
46    private static final String TAG = "CellBroadcastConfigService";
47
48    static final String ACTION_ENABLE_CHANNELS = "ACTION_ENABLE_CHANNELS";
49
50    public CellBroadcastConfigService() {
51        super(TAG);          // use class name for worker thread name
52    }
53
54    private void setChannelRange(SmsManager manager, String ranges, boolean enable) {
55        try {
56            for (String channelRange : ranges.split(",")) {
57                int dashIndex = channelRange.indexOf('-');
58                if (dashIndex != -1) {
59                    int startId = Integer.decode(channelRange.substring(0, dashIndex));
60                    int endId = Integer.decode(channelRange.substring(dashIndex + 1));
61                    if (enable) {
62                        if (DBG) Log.d(TAG, "enabling emergency IDs " + startId + '-' + endId);
63                        manager.enableCellBroadcastRange(startId, endId);
64                    } else {
65                        if (DBG) Log.d(TAG, "disabling emergency IDs " + startId + '-' + endId);
66                        manager.disableCellBroadcastRange(startId, endId);
67                    }
68                } else {
69                    int messageId = Integer.decode(channelRange);
70                    if (enable) {
71                        if (DBG) Log.d(TAG, "enabling emergency message ID " + messageId);
72                        manager.enableCellBroadcast(messageId);
73                    } else {
74                        if (DBG) Log.d(TAG, "disabling emergency message ID " + messageId);
75                        manager.disableCellBroadcast(messageId);
76                    }
77                }
78            }
79        } catch (NumberFormatException e) {
80            Log.e(TAG, "Number Format Exception parsing emergency channel range", e);
81        }
82    }
83
84    @Override
85    protected void onHandleIntent(Intent intent) {
86        if (ACTION_ENABLE_CHANNELS.equals(intent.getAction())) {
87            try {
88                SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
89                Resources res = getResources();
90
91                // Check for system property defining the emergency channel ranges to enable
92                String emergencyIdRange = SystemProperties.get("ro.cellbroadcast.emergencyids");
93
94                boolean enableEmergencyAlerts = prefs.getBoolean(
95                        CellBroadcastSettings.KEY_ENABLE_EMERGENCY_ALERTS, true);
96
97                boolean enableChannel50Alerts = res.getBoolean(R.bool.show_brazil_settings) &&
98                        prefs.getBoolean(CellBroadcastSettings.KEY_ENABLE_CHANNEL_50_ALERTS, true);
99
100                SmsManager manager = SmsManager.getDefault();
101                if (enableEmergencyAlerts) {
102                    if (DBG) Log.d(TAG, "enabling emergency cell broadcast channels");
103                    if (!TextUtils.isEmpty(emergencyIdRange)) {
104                        setChannelRange(manager, emergencyIdRange, true);
105                    } else {
106                        // No emergency channel system property, enable all emergency channels
107                        manager.enableCellBroadcastRange(
108                                SmsCbConstants.MESSAGE_ID_PWS_FIRST_IDENTIFIER,
109                                SmsCbConstants.MESSAGE_ID_PWS_LAST_IDENTIFIER);
110                    }
111                    if (DBG) Log.d(TAG, "enabled emergency cell broadcast channels");
112                } else {
113                    // we may have enabled these channels previously, so try to disable them
114                    if (DBG) Log.d(TAG, "disabling emergency cell broadcast channels");
115                    if (!TextUtils.isEmpty(emergencyIdRange)) {
116                        setChannelRange(manager, emergencyIdRange, false);
117                    } else {
118                        // No emergency channel system property, disable all emergency channels
119                        manager.disableCellBroadcastRange(
120                                SmsCbConstants.MESSAGE_ID_PWS_FIRST_IDENTIFIER,
121                                SmsCbConstants.MESSAGE_ID_PWS_LAST_IDENTIFIER);
122                    }
123                    if (DBG) Log.d(TAG, "disabled emergency cell broadcast channels");
124                }
125
126                if (enableChannel50Alerts) {
127                    if (DBG) Log.d(TAG, "enabling cell broadcast channel 50");
128                    manager.enableCellBroadcast(50);
129                    if (DBG) Log.d(TAG, "enabled cell broadcast channel 50");
130                } else {
131                    if (DBG) Log.d(TAG, "disabling cell broadcast channel 50");
132                    manager.disableCellBroadcast(50);
133                    if (DBG) Log.d(TAG, "disabled cell broadcast channel 50");
134                }
135            } catch (Exception ex) {
136                Log.e(TAG, "exception enabling cell broadcast channels", ex);
137            }
138        }
139    }
140}
141