TelephonyUtil.java revision 05cb0f975816d2018d93590df1e385d1996c3265 
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
17package com.android.server.telecom;
18
19import android.content.ComponentName;
20import android.content.Context;
21import android.net.Uri;
22import android.telecom.PhoneAccount;
23import android.telecom.PhoneAccountHandle;
24import android.telephony.PhoneNumberUtils;
25import android.telephony.SubscriptionManager;
26import android.telephony.TelephonyManager;
27
28import com.android.internal.annotations.VisibleForTesting;
29
30import java.util.Collections;
31import java.util.Comparator;
32import 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 */
38public 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.getSlotIndex(subId1) <
98                            SubscriptionManager.getSlotIndex(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