1 /*
2  * Copyright 2014, 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 
17 package com.android.server.telecom;
18 
19 import android.content.ComponentName;
20 import android.content.Context;
21 import android.net.Uri;
22 import android.telecom.PhoneAccount;
23 import android.telecom.PhoneAccountHandle;
24 import android.telephony.PhoneNumberUtils;
25 
26 /**
27  * Utilities to deal with the system telephony services. The system telephony services are treated
28  * differently from 3rd party services in some situations (emergency calls, audio focus, etc...).
29  */
30 public final class TelephonyUtil {
31     private static final String TAG = TelephonyUtil.class.getSimpleName();
32 
33     private static final String TELEPHONY_PACKAGE_NAME = "com.android.phone";
34 
35     private static final String PSTN_CALL_SERVICE_CLASS_NAME =
36             "com.android.services.telephony.TelephonyConnectionService";
37 
38     private static final PhoneAccountHandle DEFAULT_EMERGENCY_PHONE_ACCOUNT_HANDLE =
39             new PhoneAccountHandle(
40                     new ComponentName(TELEPHONY_PACKAGE_NAME, PSTN_CALL_SERVICE_CLASS_NAME), "E");
41 
TelephonyUtil()42     private TelephonyUtil() {}
43 
44     /**
45      * @return fallback {@link PhoneAccount} to be used by Telecom for emergency calls in the
46      * rare case that Telephony has not registered any phone accounts yet. Details about this
47      * account are not expected to be displayed in the UI, so the description, etc are not
48      * populated.
49      */
getDefaultEmergencyPhoneAccount()50     static PhoneAccount getDefaultEmergencyPhoneAccount() {
51         return PhoneAccount.builder(DEFAULT_EMERGENCY_PHONE_ACCOUNT_HANDLE, "E")
52                 .setCapabilities(PhoneAccount.CAPABILITY_SIM_SUBSCRIPTION |
53                         PhoneAccount.CAPABILITY_CALL_PROVIDER |
54                         PhoneAccount.CAPABILITY_PLACE_EMERGENCY_CALLS).build();
55     }
56 
isPstnComponentName(ComponentName componentName)57     static boolean isPstnComponentName(ComponentName componentName) {
58         final ComponentName pstnComponentName = new ComponentName(
59                 TELEPHONY_PACKAGE_NAME, PSTN_CALL_SERVICE_CLASS_NAME);
60         return pstnComponentName.equals(componentName);
61     }
62 
shouldProcessAsEmergency(Context context, Uri handle)63     static boolean shouldProcessAsEmergency(Context context, Uri handle) {
64         return handle != null && PhoneNumberUtils.isPotentialLocalEmergencyNumber(
65                 context, handle.getSchemeSpecificPart());
66     }
67 }
68