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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 import com.android.internal.annotations.VisibleForTesting;
     27 
     28 /**
     29  * Utilities to deal with the system telephony services. The system telephony services are treated
     30  * differently from 3rd party services in some situations (emergency calls, audio focus, etc...).
     31  */
     32 public final class TelephonyUtil {
     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     @VisibleForTesting
     51     public static PhoneAccount getDefaultEmergencyPhoneAccount() {
     52         return PhoneAccount.builder(DEFAULT_EMERGENCY_PHONE_ACCOUNT_HANDLE, "E")
     53                 .setCapabilities(PhoneAccount.CAPABILITY_SIM_SUBSCRIPTION |
     54                         PhoneAccount.CAPABILITY_CALL_PROVIDER |
     55                         PhoneAccount.CAPABILITY_PLACE_EMERGENCY_CALLS)
     56                 .setIsEnabled(true)
     57                 .build();
     58     }
     59 
     60     static boolean isPstnComponentName(ComponentName componentName) {
     61         final ComponentName pstnComponentName = new ComponentName(
     62                 TELEPHONY_PACKAGE_NAME, PSTN_CALL_SERVICE_CLASS_NAME);
     63         return pstnComponentName.equals(componentName);
     64     }
     65 
     66     public static boolean shouldProcessAsEmergency(Context context, Uri handle) {
     67         return handle != null && PhoneNumberUtils.isLocalEmergencyNumber(
     68                 context, handle.getSchemeSpecificPart());
     69     }
     70 }
     71