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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 import android.telephony.SubscriptionManager;
     26 import android.telephony.TelephonyManager;
     27 
     28 import com.android.internal.annotations.VisibleForTesting;
     29 
     30 import java.util.Collections;
     31 import java.util.Comparator;
     32 import java.util.List;
     33 
     34 /**
     35  * Utilities to deal with the system telephony services. The system telephony services are treated
     36  * differently from 3rd party services in some situations (emergency calls, audio focus, etc...).
     37  */
     38 public final class TelephonyUtil {
     39     private static final String TELEPHONY_PACKAGE_NAME = "com.android.phone";
     40 
     41     private static final String PSTN_CALL_SERVICE_CLASS_NAME =
     42             "com.android.services.telephony.TelephonyConnectionService";
     43 
     44     private static final PhoneAccountHandle DEFAULT_EMERGENCY_PHONE_ACCOUNT_HANDLE =
     45             new PhoneAccountHandle(
     46                     new ComponentName(TELEPHONY_PACKAGE_NAME, PSTN_CALL_SERVICE_CLASS_NAME), "E");
     47 
     48     private TelephonyUtil() {}
     49 
     50     /**
     51      * @return fallback {@link PhoneAccount} to be used by Telecom for emergency calls in the
     52      * rare case that Telephony has not registered any phone accounts yet. Details about this
     53      * account are not expected to be displayed in the UI, so the description, etc are not
     54      * populated.
     55      */
     56     @VisibleForTesting
     57     public static PhoneAccount getDefaultEmergencyPhoneAccount() {
     58         return PhoneAccount.builder(DEFAULT_EMERGENCY_PHONE_ACCOUNT_HANDLE, "E")
     59                 .setCapabilities(PhoneAccount.CAPABILITY_SIM_SUBSCRIPTION |
     60                         PhoneAccount.CAPABILITY_CALL_PROVIDER |
     61                         PhoneAccount.CAPABILITY_PLACE_EMERGENCY_CALLS)
     62                 .setIsEnabled(true)
     63                 .build();
     64     }
     65 
     66     static boolean isPstnComponentName(ComponentName componentName) {
     67         final ComponentName pstnComponentName = new ComponentName(
     68                 TELEPHONY_PACKAGE_NAME, PSTN_CALL_SERVICE_CLASS_NAME);
     69         return pstnComponentName.equals(componentName);
     70     }
     71 
     72     public static boolean shouldProcessAsEmergency(Context context, Uri handle) {
     73         return handle != null && PhoneNumberUtils.isLocalEmergencyNumber(
     74                 context, handle.getSchemeSpecificPart());
     75     }
     76 
     77     public static void sortSimPhoneAccounts(Context context, List<PhoneAccount> accounts) {
     78         final TelephonyManager telephonyManager = TelephonyManager.from(context);
     79 
     80         // Sort the accounts according to how we want to display them.
     81         Collections.sort(accounts, new Comparator<PhoneAccount>() {
     82             @Override
     83             public int compare(PhoneAccount account1, PhoneAccount account2) {
     84                 int retval = 0;
     85 
     86                 // SIM accounts go first
     87                 boolean isSim1 = account1.hasCapabilities(PhoneAccount.CAPABILITY_SIM_SUBSCRIPTION);
     88                 boolean isSim2 = account2.hasCapabilities(PhoneAccount.CAPABILITY_SIM_SUBSCRIPTION);
     89                 if (isSim1 != isSim2) {
     90                     retval = isSim1 ? -1 : 1;
     91                 }
     92 
     93                 int subId1 = telephonyManager.getSubIdForPhoneAccount(account1);
     94                 int subId2 = telephonyManager.getSubIdForPhoneAccount(account2);
     95                 if (subId1 != SubscriptionManager.INVALID_SUBSCRIPTION_ID &&
     96                         subId2 != SubscriptionManager.INVALID_SUBSCRIPTION_ID) {
     97                     retval = (SubscriptionManager.getSlotId(subId1) <
     98                             SubscriptionManager.getSlotId(subId2)) ? -1 : 1;
     99                 }
    100 
    101                 // Then order by package
    102                 if (retval == 0) {
    103                     String pkg1 = account1.getAccountHandle().getComponentName().getPackageName();
    104                     String pkg2 = account2.getAccountHandle().getComponentName().getPackageName();
    105                     retval = pkg1.compareTo(pkg2);
    106                 }
    107 
    108                 // Finally, order by label
    109                 if (retval == 0) {
    110                     String label1 = nullToEmpty(account1.getLabel().toString());
    111                     String label2 = nullToEmpty(account2.getLabel().toString());
    112                     retval = label1.compareTo(label2);
    113                 }
    114 
    115                 // Then by hashcode
    116                 if (retval == 0) {
    117                     retval = account1.hashCode() - account2.hashCode();
    118                 }
    119                 return retval;
    120             }
    121         });
    122     }
    123 
    124     private static String nullToEmpty(String str) {
    125         return str == null ? "" : str;
    126     }
    127 }
    128