1 /*
2  * Copyright (C) 2015 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 package com.android.contacts.common.compat.telecom;
17 
18 import android.support.annotation.Nullable;
19 import android.telecom.PhoneAccountHandle;
20 import android.telecom.TelecomManager;
21 import java.lang.reflect.Field;
22 
23 /** Compatibility class for {@link android.telecom.TelecomManager}. */
24 public class TelecomManagerCompat {
25 
26   // Constants from http://cs/android/frameworks/base/telecomm/java/android/telecom/Call.java.
27   public static final String EVENT_REQUEST_HANDOVER = "android.telecom.event.REQUEST_HANDOVER";
28   public static final String EXTRA_HANDOVER_PHONE_ACCOUNT_HANDLE =
29       "android.telecom.extra.HANDOVER_PHONE_ACCOUNT_HANDLE";
30   public static final String EXTRA_HANDOVER_VIDEO_STATE =
31       "android.telecom.extra.HANDOVER_VIDEO_STATE";
32 
33   // This is a hidden constant in android.telecom.DisconnectCause. Telecom sets this as a disconnect
34   // reason if it wants us to prompt the user that the video call is not available.
35   // TODO(wangqi): Reference it to constant in android.telecom.DisconnectCause.
36   public static final String REASON_IMS_ACCESS_BLOCKED = "REASON_IMS_ACCESS_BLOCKED";
37 
38   /**
39    * Returns the current SIM call manager. Apps must be prepared for this method to return null,
40    * indicating that there currently exists no registered SIM call manager.
41    *
42    * @param telecomManager the {@link TelecomManager} to use to fetch the SIM call manager.
43    * @return The phone account handle of the current sim call manager.
44    */
45   @Nullable
getSimCallManager(TelecomManager telecomManager)46   public static PhoneAccountHandle getSimCallManager(TelecomManager telecomManager) {
47     if (telecomManager != null) {
48       return telecomManager.getSimCallManager();
49     }
50     return null;
51   }
52 
53   /**
54    * Handovers are supported from Android O-DR onward. Since there is no API bump from O to O-DR, we
55    * need to use reflection to check the existence of TelecomManager.EXTRA_IS_HANDOVER in
56    * http://cs/android/frameworks/base/telecomm/java/android/telecom/TelecomManager.java.
57    */
supportsHandover()58   public static boolean supportsHandover() {
59     //
60     try {
61       Field field = TelecomManager.class.getDeclaredField("EXTRA_IS_HANDOVER");
62       return "android.telecom.extra.IS_HANDOVER".equals(field.get(null /* obj (static field) */));
63     } catch (Exception e) {
64       // Do nothing
65     }
66     return false;
67   }
68 }
69