1 /*
2  * Copyright (C) 2016 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.settings.notification;
18 
19 import android.content.Context;
20 import android.content.pm.PackageManager;
21 import android.os.UserHandle;
22 import android.os.UserManager;
23 
24 import androidx.annotation.VisibleForTesting;
25 import androidx.preference.Preference;
26 
27 import com.android.internal.telephony.CellBroadcastUtils;
28 import com.android.settings.accounts.AccountRestrictionHelper;
29 import com.android.settings.core.PreferenceControllerMixin;
30 import com.android.settingslib.RestrictedPreference;
31 import com.android.settingslib.core.AbstractPreferenceController;
32 
33 /**
34  * Base class for preference controller that handles preference that enforce adjust volume
35  * restriction
36  */
37 public class EmergencyBroadcastPreferenceController extends AbstractPreferenceController
38         implements PreferenceControllerMixin {
39 
40     private final String mPrefKey;
41 
42     private AccountRestrictionHelper mHelper;
43     private UserManager mUserManager;
44     private PackageManager mPm;
45 
EmergencyBroadcastPreferenceController(Context context, String prefKey)46     public EmergencyBroadcastPreferenceController(Context context, String prefKey) {
47         this(context, new AccountRestrictionHelper(context), prefKey);
48     }
49 
50     @VisibleForTesting(otherwise = VisibleForTesting.NONE)
EmergencyBroadcastPreferenceController(Context context, AccountRestrictionHelper helper, String prefKey)51     EmergencyBroadcastPreferenceController(Context context, AccountRestrictionHelper helper,
52             String prefKey) {
53         super(context);
54         mPrefKey = prefKey;
55         mHelper = helper;
56         mUserManager = (UserManager) context.getSystemService(Context.USER_SERVICE);
57         mPm = mContext.getPackageManager();
58     }
59 
60     @Override
updateState(Preference preference)61     public void updateState(Preference preference) {
62         if (!(preference instanceof RestrictedPreference)) {
63             return;
64         }
65         ((RestrictedPreference) preference).checkRestrictionAndSetDisabled(
66                 UserManager.DISALLOW_CONFIG_CELL_BROADCASTS);
67     }
68 
69     @Override
handlePreferenceTreeClick(Preference preference)70     public boolean handlePreferenceTreeClick(Preference preference) {
71         return false;
72     }
73 
74     @Override
getPreferenceKey()75     public String getPreferenceKey() {
76         return mPrefKey;
77     }
78 
79     @Override
isAvailable()80     public boolean isAvailable() {
81         return mUserManager.isAdminUser() && isCellBroadcastAppLinkEnabled()
82                 && !mHelper.hasBaseUserRestriction(
83                 UserManager.DISALLOW_CONFIG_CELL_BROADCASTS, UserHandle.myUserId());
84     }
85 
isCellBroadcastAppLinkEnabled()86     private boolean isCellBroadcastAppLinkEnabled() {
87         // Enable link to CMAS app settings depending on the value in config.xml.
88         boolean enabled = mContext.getResources().getBoolean(
89             com.android.internal.R.bool.config_cellBroadcastAppLinks) &&
90             // For data-only tablet devices which need to not forwarding any WEA-alert and hide from
91             // settings menu.
92             !mContext.getResources().getBoolean(
93                 com.android.internal.R.bool.config_disable_all_cb_messages);
94         if (enabled) {
95             try {
96                 String packageName = CellBroadcastUtils
97                         .getDefaultCellBroadcastReceiverPackageName(mContext);
98                 if (packageName == null || mPm.getApplicationEnabledSetting(packageName)
99                         == PackageManager.COMPONENT_ENABLED_STATE_DISABLED) {
100                     enabled = false;  // CMAS app disabled
101                 }
102             } catch (IllegalArgumentException ignored) {
103                 enabled = false;  // CMAS app not installed
104             }
105         }
106         return enabled;
107     }
108 
109 }