1 /**
2  * Copyright (C) 2019 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 android.ext.services.notification;
17 
18 import android.content.BroadcastReceiver;
19 import android.content.Context;
20 import android.content.Intent;
21 import android.content.IntentFilter;
22 import android.provider.Telephony;
23 import android.util.Log;
24 
25 import androidx.annotation.Nullable;
26 
27 /**
28  * A helper class for storing and retrieving the default SMS application.
29  */
30 public class SmsHelper {
31     private static final String TAG = "SmsHelper";
32 
33     // TODO: user RoleManager instead of copying this constant
34     private static String ACTION_DEFAULT_SMS_PACKAGE_CHANGED_INTERNAL
35             = "android.provider.action.DEFAULT_SMS_PACKAGE_CHANGED_INTERNAL";
36 
37     private final Context mContext;
38     private String mDefaultSmsPackage;
39     private BroadcastReceiver mBroadcastReceiver;
40 
SmsHelper(Context context)41     SmsHelper(Context context) {
42         mContext = context.getApplicationContext();
43     }
44 
initialize()45     void initialize() {
46         if (mBroadcastReceiver == null) {
47             mDefaultSmsPackage = Telephony.Sms.getDefaultSmsPackage(mContext);
48             mBroadcastReceiver = new BroadcastReceiver() {
49                 @Override
50                 public void onReceive(Context context, Intent intent) {
51                     if (ACTION_DEFAULT_SMS_PACKAGE_CHANGED_INTERNAL.equals(intent.getAction())) {
52                         mDefaultSmsPackage = Telephony.Sms.getDefaultSmsPackage(mContext);
53                     } else {
54                         Log.w(TAG, "Unknown broadcast received: " + intent.getAction());
55                     }
56                 }
57             };
58             mContext.registerReceiver(
59                     mBroadcastReceiver,
60                     new IntentFilter(ACTION_DEFAULT_SMS_PACKAGE_CHANGED_INTERNAL));
61         }
62     }
63 
destroy()64     void destroy() {
65         if (mBroadcastReceiver != null) {
66             mContext.unregisterReceiver(mBroadcastReceiver);
67             mBroadcastReceiver = null;
68         }
69     }
70 
71     @Nullable
getDefaultSmsPackage()72     public String getDefaultSmsPackage() {
73         return mDefaultSmsPackage;
74     }
75 }
76