1 /*
2  * Copyright (C) 2020 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.internal.telephony;
18 
19 import android.content.Context;
20 import android.content.Intent;
21 import android.content.pm.PackageManager;
22 import android.content.pm.ResolveInfo;
23 import android.provider.Telephony;
24 import android.text.TextUtils;
25 import android.util.Log;
26 
27 /**
28  * This class provides utility functions related to CellBroadcast.
29  */
30 public class CellBroadcastUtils {
31     private static final String TAG = "CellBroadcastUtils";
32     private static final boolean VDBG = false;
33 
34     /**
35      * Utility method to query the default CBR's package name.
36      */
getDefaultCellBroadcastReceiverPackageName(Context context)37     public static String getDefaultCellBroadcastReceiverPackageName(Context context) {
38         PackageManager packageManager = context.getPackageManager();
39         ResolveInfo resolveInfo = packageManager.resolveActivity(
40                 new Intent(Telephony.Sms.Intents.SMS_CB_RECEIVED_ACTION),
41                 PackageManager.MATCH_SYSTEM_ONLY);
42         String packageName;
43 
44         if (resolveInfo == null) {
45             Log.e(TAG, "getDefaultCellBroadcastReceiverPackageName: no package found");
46             return null;
47         }
48 
49         packageName = resolveInfo.activityInfo.applicationInfo.packageName;
50 
51         if (VDBG) {
52             Log.d(TAG, "getDefaultCellBroadcastReceiverPackageName: found package: " + packageName);
53         }
54 
55         if (TextUtils.isEmpty(packageName) || packageManager.checkPermission(
56                 android.Manifest.permission.READ_CELL_BROADCASTS, packageName)
57                 == PackageManager.PERMISSION_DENIED) {
58             Log.e(TAG, "getDefaultCellBroadcastReceiverPackageName: returning null; "
59                     + "permission check failed for : " + packageName);
60             return null;
61         }
62 
63         return packageName;
64     }
65 }
66