1 /* 2 * Copyright (C) 2024 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.network.telephony; 18 19 import android.content.Context; 20 import android.telephony.SubscriptionInfo; 21 import android.telephony.TelephonyManager; 22 import android.util.Log; 23 24 import androidx.annotation.NonNull; 25 26 import com.android.internal.telephony.flags.FeatureFlags; 27 import com.android.internal.telephony.flags.FeatureFlagsImpl; 28 import com.android.settings.core.BasePreferenceController; 29 import com.android.settings.network.SubscriptionUtil; 30 31 import java.util.List; 32 33 /** 34 * {@link BasePreferenceController} for visibility of Encryption divider on Cellular Security 35 * settings page. 36 */ 37 public class CellularSecurityEncryptionDividerController extends 38 BasePreferenceController { 39 40 private static final String LOG_TAG = "CellularSecurityEncryptionDividerController"; 41 42 private TelephonyManager mTelephonyManager; 43 44 protected final FeatureFlags mFeatureFlags = new FeatureFlagsImpl(); 45 46 /** 47 * Class constructor of "Cellular Security" preference. 48 * 49 * @param context of settings 50 * @param prefKey assigned within UI entry of XML file 51 */ CellularSecurityEncryptionDividerController( @onNull Context context, @NonNull String prefKey)52 public CellularSecurityEncryptionDividerController( 53 @NonNull Context context, @NonNull String prefKey) { 54 super(context, prefKey); 55 mTelephonyManager = mContext.getSystemService(TelephonyManager.class); 56 } 57 58 @Override getAvailabilityStatus()59 public int getAvailabilityStatus() { 60 if (mTelephonyManager == null) { 61 Log.w(LOG_TAG, "Telephony manager not yet initialized."); 62 mTelephonyManager = mContext.getSystemService(TelephonyManager.class); 63 } 64 65 // Check there are valid SIM cards which can be displayed to the user, otherwise this 66 // settings should not be shown. 67 List<SubscriptionInfo> availableSubs = SubscriptionUtil.getAvailableSubscriptions(mContext); 68 if (availableSubs.isEmpty()) { 69 return CONDITIONALLY_UNAVAILABLE; 70 } 71 72 try { 73 mTelephonyManager.isNullCipherAndIntegrityPreferenceEnabled(); 74 } catch (UnsupportedOperationException e) { 75 Log.i(LOG_TAG, "Null cipher enablement is unsupported, hiding divider: " 76 + e.getMessage()); 77 return UNSUPPORTED_ON_DEVICE; 78 } catch (Exception e) { 79 Log.e(LOG_TAG, 80 "Failed isNullCipherAndIntegrityEnabled. Setting availability to " 81 + "CONDITIONALLY_UNAVAILABLE. Exception: " 82 + e.getMessage()); 83 return CONDITIONALLY_UNAVAILABLE; 84 } 85 return AVAILABLE; 86 } 87 } 88