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      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 
     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      */
     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 
     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 
     63     static boolean shouldProcessAsEmergency(Context context, Uri handle) {
     64         return handle != null && PhoneNumberUtils.isPotentialLocalEmergencyNumber(
     65                 context, handle.getSchemeSpecificPart());
     66     }
     67 }
     68