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      1 /*
      2  * Copyright (C) 2007 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;
     18 
     19 
     20 import static android.provider.Settings.System.SCREEN_OFF_TIMEOUT;
     21 
     22 import android.app.Activity;
     23 import android.app.ActivityManager;
     24 import android.app.AlertDialog;
     25 import android.app.admin.DevicePolicyManager;
     26 import android.content.Context;
     27 import android.content.DialogInterface;
     28 import android.content.Intent;
     29 import android.content.pm.PackageManager;
     30 import android.content.pm.ResolveInfo;
     31 import android.content.pm.UserInfo;
     32 import android.os.Bundle;
     33 import android.os.UserHandle;
     34 import android.os.UserManager;
     35 import android.preference.CheckBoxPreference;
     36 import android.preference.ListPreference;
     37 import android.preference.Preference;
     38 import android.preference.Preference.OnPreferenceChangeListener;
     39 import android.preference.PreferenceGroup;
     40 import android.preference.PreferenceScreen;
     41 import android.provider.Settings;
     42 import android.security.KeyStore;
     43 import android.telephony.TelephonyManager;
     44 import android.util.Log;
     45 
     46 import com.android.internal.widget.LockPatternUtils;
     47 
     48 import java.util.ArrayList;
     49 import java.util.List;
     50 
     51 /**
     52  * Gesture lock pattern settings.
     53  */
     54 public class SecuritySettings extends RestrictedSettingsFragment
     55         implements OnPreferenceChangeListener, DialogInterface.OnClickListener {
     56     static final String TAG = "SecuritySettings";
     57 
     58     // Lock Settings
     59     private static final String KEY_UNLOCK_SET_OR_CHANGE = "unlock_set_or_change";
     60     private static final String KEY_BIOMETRIC_WEAK_IMPROVE_MATCHING =
     61             "biometric_weak_improve_matching";
     62     private static final String KEY_BIOMETRIC_WEAK_LIVELINESS = "biometric_weak_liveliness";
     63     private static final String KEY_LOCK_ENABLED = "lockenabled";
     64     private static final String KEY_VISIBLE_PATTERN = "visiblepattern";
     65     private static final String KEY_SECURITY_CATEGORY = "security_category";
     66     private static final String KEY_DEVICE_ADMIN_CATEGORY = "device_admin_category";
     67     private static final String KEY_LOCK_AFTER_TIMEOUT = "lock_after_timeout";
     68     private static final String KEY_OWNER_INFO_SETTINGS = "owner_info_settings";
     69     private static final String KEY_ENABLE_WIDGETS = "keyguard_enable_widgets";
     70 
     71     private static final int SET_OR_CHANGE_LOCK_METHOD_REQUEST = 123;
     72     private static final int CONFIRM_EXISTING_FOR_BIOMETRIC_WEAK_IMPROVE_REQUEST = 124;
     73     private static final int CONFIRM_EXISTING_FOR_BIOMETRIC_WEAK_LIVELINESS_OFF = 125;
     74 
     75     // Misc Settings
     76     private static final String KEY_SIM_LOCK = "sim_lock";
     77     private static final String KEY_SHOW_PASSWORD = "show_password";
     78     private static final String KEY_CREDENTIAL_STORAGE_TYPE = "credential_storage_type";
     79     private static final String KEY_RESET_CREDENTIALS = "reset_credentials";
     80     private static final String KEY_CREDENTIALS_INSTALL = "credentials_install";
     81     private static final String KEY_TOGGLE_INSTALL_APPLICATIONS = "toggle_install_applications";
     82     private static final String KEY_TOGGLE_VERIFY_APPLICATIONS = "toggle_verify_applications";
     83     private static final String KEY_POWER_INSTANTLY_LOCKS = "power_button_instantly_locks";
     84     private static final String KEY_CREDENTIALS_MANAGER = "credentials_management";
     85     private static final String KEY_NOTIFICATION_ACCESS = "manage_notification_access";
     86     private static final String PACKAGE_MIME_TYPE = "application/vnd.android.package-archive";
     87 
     88     private PackageManager mPM;
     89     private DevicePolicyManager mDPM;
     90 
     91     private ChooseLockSettingsHelper mChooseLockSettingsHelper;
     92     private LockPatternUtils mLockPatternUtils;
     93     private ListPreference mLockAfter;
     94 
     95     private CheckBoxPreference mBiometricWeakLiveliness;
     96     private CheckBoxPreference mVisiblePattern;
     97 
     98     private CheckBoxPreference mShowPassword;
     99 
    100     private KeyStore mKeyStore;
    101     private Preference mResetCredentials;
    102 
    103     private CheckBoxPreference mToggleAppInstallation;
    104     private DialogInterface mWarnInstallApps;
    105     private CheckBoxPreference mToggleVerifyApps;
    106     private CheckBoxPreference mPowerButtonInstantlyLocks;
    107     private CheckBoxPreference mEnableKeyguardWidgets;
    108 
    109     private Preference mNotificationAccess;
    110 
    111     private boolean mIsPrimary;
    112 
    113     public SecuritySettings() {
    114         super(null /* Don't ask for restrictions pin on creation. */);
    115     }
    116 
    117     @Override
    118     public void onCreate(Bundle savedInstanceState) {
    119         super.onCreate(savedInstanceState);
    120 
    121         mLockPatternUtils = new LockPatternUtils(getActivity());
    122 
    123         mPM = getActivity().getPackageManager();
    124         mDPM = (DevicePolicyManager)getSystemService(Context.DEVICE_POLICY_SERVICE);
    125 
    126         mChooseLockSettingsHelper = new ChooseLockSettingsHelper(getActivity());
    127     }
    128 
    129     private PreferenceScreen createPreferenceHierarchy() {
    130         PreferenceScreen root = getPreferenceScreen();
    131         if (root != null) {
    132             root.removeAll();
    133         }
    134         addPreferencesFromResource(R.xml.security_settings);
    135         root = getPreferenceScreen();
    136 
    137         // Add options for lock/unlock screen
    138         int resid = 0;
    139         if (!mLockPatternUtils.isSecure()) {
    140             // if there are multiple users, disable "None" setting
    141             UserManager mUm = (UserManager) getSystemService(Context.USER_SERVICE);
    142             List<UserInfo> users = mUm.getUsers(true);
    143             final boolean singleUser = users.size() == 1;
    144 
    145             if (singleUser && mLockPatternUtils.isLockScreenDisabled()) {
    146                 resid = R.xml.security_settings_lockscreen;
    147             } else {
    148                 resid = R.xml.security_settings_chooser;
    149             }
    150         } else if (mLockPatternUtils.usingBiometricWeak() &&
    151                 mLockPatternUtils.isBiometricWeakInstalled()) {
    152             resid = R.xml.security_settings_biometric_weak;
    153         } else {
    154             switch (mLockPatternUtils.getKeyguardStoredPasswordQuality()) {
    155                 case DevicePolicyManager.PASSWORD_QUALITY_SOMETHING:
    156                     resid = R.xml.security_settings_pattern;
    157                     break;
    158                 case DevicePolicyManager.PASSWORD_QUALITY_NUMERIC:
    159                     resid = R.xml.security_settings_pin;
    160                     break;
    161                 case DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC:
    162                 case DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC:
    163                 case DevicePolicyManager.PASSWORD_QUALITY_COMPLEX:
    164                     resid = R.xml.security_settings_password;
    165                     break;
    166             }
    167         }
    168         addPreferencesFromResource(resid);
    169 
    170 
    171         // Add options for device encryption
    172         mIsPrimary = UserHandle.myUserId() == UserHandle.USER_OWNER;
    173 
    174         if (!mIsPrimary) {
    175             // Rename owner info settings
    176             Preference ownerInfoPref = findPreference(KEY_OWNER_INFO_SETTINGS);
    177             if (ownerInfoPref != null) {
    178                 if (UserManager.get(getActivity()).isLinkedUser()) {
    179                     ownerInfoPref.setTitle(R.string.profile_info_settings_title);
    180                 } else {
    181                     ownerInfoPref.setTitle(R.string.user_info_settings_title);
    182                 }
    183             }
    184         }
    185 
    186         if (mIsPrimary) {
    187             switch (mDPM.getStorageEncryptionStatus()) {
    188             case DevicePolicyManager.ENCRYPTION_STATUS_ACTIVE:
    189                 // The device is currently encrypted.
    190                 addPreferencesFromResource(R.xml.security_settings_encrypted);
    191                 break;
    192             case DevicePolicyManager.ENCRYPTION_STATUS_INACTIVE:
    193                 // This device supports encryption but isn't encrypted.
    194                 addPreferencesFromResource(R.xml.security_settings_unencrypted);
    195                 break;
    196             }
    197         }
    198 
    199         // lock after preference
    200         mLockAfter = (ListPreference) root.findPreference(KEY_LOCK_AFTER_TIMEOUT);
    201         if (mLockAfter != null) {
    202             setupLockAfterPreference();
    203             updateLockAfterPreferenceSummary();
    204         }
    205 
    206         // biometric weak liveliness
    207         mBiometricWeakLiveliness =
    208                 (CheckBoxPreference) root.findPreference(KEY_BIOMETRIC_WEAK_LIVELINESS);
    209 
    210         // visible pattern
    211         mVisiblePattern = (CheckBoxPreference) root.findPreference(KEY_VISIBLE_PATTERN);
    212 
    213         // lock instantly on power key press
    214         mPowerButtonInstantlyLocks = (CheckBoxPreference) root.findPreference(
    215                 KEY_POWER_INSTANTLY_LOCKS);
    216 
    217         // don't display visible pattern if biometric and backup is not pattern
    218         if (resid == R.xml.security_settings_biometric_weak &&
    219                 mLockPatternUtils.getKeyguardStoredPasswordQuality() !=
    220                 DevicePolicyManager.PASSWORD_QUALITY_SOMETHING) {
    221             PreferenceGroup securityCategory = (PreferenceGroup)
    222                     root.findPreference(KEY_SECURITY_CATEGORY);
    223             if (securityCategory != null && mVisiblePattern != null) {
    224                 securityCategory.removePreference(root.findPreference(KEY_VISIBLE_PATTERN));
    225             }
    226         }
    227 
    228         // Append the rest of the settings
    229         addPreferencesFromResource(R.xml.security_settings_misc);
    230 
    231         // Do not display SIM lock for devices without an Icc card
    232         TelephonyManager tm = TelephonyManager.getDefault();
    233         if (!mIsPrimary || !tm.hasIccCard()) {
    234             root.removePreference(root.findPreference(KEY_SIM_LOCK));
    235         } else {
    236             // Disable SIM lock if sim card is missing or unknown
    237             if ((TelephonyManager.getDefault().getSimState() ==
    238                                  TelephonyManager.SIM_STATE_ABSENT) ||
    239                 (TelephonyManager.getDefault().getSimState() ==
    240                                  TelephonyManager.SIM_STATE_UNKNOWN)) {
    241                 root.findPreference(KEY_SIM_LOCK).setEnabled(false);
    242             }
    243         }
    244 
    245         // Enable or disable keyguard widget checkbox based on DPM state
    246         mEnableKeyguardWidgets = (CheckBoxPreference) root.findPreference(KEY_ENABLE_WIDGETS);
    247         if (mEnableKeyguardWidgets != null) {
    248             if (ActivityManager.isLowRamDeviceStatic()
    249                     || mLockPatternUtils.isLockScreenDisabled()) {
    250                 // Widgets take a lot of RAM, so disable them on low-memory devices
    251                 PreferenceGroup securityCategory
    252                         = (PreferenceGroup) root.findPreference(KEY_SECURITY_CATEGORY);
    253                 if (securityCategory != null) {
    254                     securityCategory.removePreference(root.findPreference(KEY_ENABLE_WIDGETS));
    255                     mEnableKeyguardWidgets = null;
    256                 }
    257             } else {
    258                 final boolean disabled = (0 != (mDPM.getKeyguardDisabledFeatures(null)
    259                         & DevicePolicyManager.KEYGUARD_DISABLE_WIDGETS_ALL));
    260                 if (disabled) {
    261                     mEnableKeyguardWidgets.setSummary(
    262                             R.string.security_enable_widgets_disabled_summary);
    263                 } else {
    264                     mEnableKeyguardWidgets.setSummary("");
    265                 }
    266                 mEnableKeyguardWidgets.setEnabled(!disabled);
    267             }
    268         }
    269 
    270         // Show password
    271         mShowPassword = (CheckBoxPreference) root.findPreference(KEY_SHOW_PASSWORD);
    272         mResetCredentials = root.findPreference(KEY_RESET_CREDENTIALS);
    273 
    274         // Credential storage
    275         final UserManager um = (UserManager) getActivity().getSystemService(Context.USER_SERVICE);
    276         mKeyStore = KeyStore.getInstance(); // needs to be initialized for onResume()
    277         if (!um.hasUserRestriction(UserManager.DISALLOW_CONFIG_CREDENTIALS)) {
    278             Preference credentialStorageType = root.findPreference(KEY_CREDENTIAL_STORAGE_TYPE);
    279 
    280             final int storageSummaryRes =
    281                 mKeyStore.isHardwareBacked() ? R.string.credential_storage_type_hardware
    282                         : R.string.credential_storage_type_software;
    283             credentialStorageType.setSummary(storageSummaryRes);
    284 
    285         } else {
    286             removePreference(KEY_CREDENTIALS_MANAGER);
    287         }
    288 
    289         // Application install
    290         PreferenceGroup deviceAdminCategory= (PreferenceGroup)
    291                 root.findPreference(KEY_DEVICE_ADMIN_CATEGORY);
    292         mToggleAppInstallation = (CheckBoxPreference) findPreference(
    293                 KEY_TOGGLE_INSTALL_APPLICATIONS);
    294         mToggleAppInstallation.setChecked(isNonMarketAppsAllowed());
    295 
    296         // Side loading of apps.
    297         mToggleAppInstallation.setEnabled(mIsPrimary);
    298 
    299         // Package verification, only visible to primary user and if enabled
    300         mToggleVerifyApps = (CheckBoxPreference) findPreference(KEY_TOGGLE_VERIFY_APPLICATIONS);
    301         if (mIsPrimary && showVerifierSetting()) {
    302             if (isVerifierInstalled()) {
    303                 mToggleVerifyApps.setChecked(isVerifyAppsEnabled());
    304             } else {
    305                 mToggleVerifyApps.setChecked(false);
    306                 mToggleVerifyApps.setEnabled(false);
    307             }
    308         } else {
    309             if (deviceAdminCategory != null) {
    310                 deviceAdminCategory.removePreference(mToggleVerifyApps);
    311             } else {
    312                 mToggleVerifyApps.setEnabled(false);
    313             }
    314         }
    315 
    316         mNotificationAccess = findPreference(KEY_NOTIFICATION_ACCESS);
    317         if (mNotificationAccess != null) {
    318             final int total = NotificationAccessSettings.getListenersCount(mPM);
    319             if (total == 0) {
    320                 if (deviceAdminCategory != null) {
    321                     deviceAdminCategory.removePreference(mNotificationAccess);
    322                 }
    323             } else {
    324                 final int n = getNumEnabledNotificationListeners();
    325                 if (n == 0) {
    326                     mNotificationAccess.setSummary(getResources().getString(
    327                             R.string.manage_notification_access_summary_zero));
    328                 } else {
    329                     mNotificationAccess.setSummary(String.format(getResources().getQuantityString(
    330                             R.plurals.manage_notification_access_summary_nonzero,
    331                             n, n)));
    332                 }
    333             }
    334         }
    335 
    336         if (shouldBePinProtected(RESTRICTIONS_PIN_SET)) {
    337             protectByRestrictions(mToggleAppInstallation);
    338             protectByRestrictions(mToggleVerifyApps);
    339             protectByRestrictions(mResetCredentials);
    340             protectByRestrictions(root.findPreference(KEY_CREDENTIALS_INSTALL));
    341         }
    342         return root;
    343     }
    344 
    345     private int getNumEnabledNotificationListeners() {
    346         final String flat = Settings.Secure.getString(getContentResolver(),
    347                 Settings.Secure.ENABLED_NOTIFICATION_LISTENERS);
    348         if (flat == null || "".equals(flat)) return 0;
    349         final String[] components = flat.split(":");
    350         return components.length;
    351     }
    352 
    353     private boolean isNonMarketAppsAllowed() {
    354         return Settings.Global.getInt(getContentResolver(),
    355                                       Settings.Global.INSTALL_NON_MARKET_APPS, 0) > 0;
    356     }
    357 
    358     private void setNonMarketAppsAllowed(boolean enabled) {
    359         final UserManager um = (UserManager) getActivity().getSystemService(Context.USER_SERVICE);
    360         if (um.hasUserRestriction(UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES)) {
    361             return;
    362         }
    363         // Change the system setting
    364         Settings.Global.putInt(getContentResolver(), Settings.Global.INSTALL_NON_MARKET_APPS,
    365                                 enabled ? 1 : 0);
    366     }
    367 
    368     private boolean isVerifyAppsEnabled() {
    369         return Settings.Global.getInt(getContentResolver(),
    370                                       Settings.Global.PACKAGE_VERIFIER_ENABLE, 1) > 0;
    371     }
    372 
    373     private boolean isVerifierInstalled() {
    374         final PackageManager pm = getPackageManager();
    375         final Intent verification = new Intent(Intent.ACTION_PACKAGE_NEEDS_VERIFICATION);
    376         verification.setType(PACKAGE_MIME_TYPE);
    377         verification.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
    378         final List<ResolveInfo> receivers = pm.queryBroadcastReceivers(verification, 0);
    379         return (receivers.size() > 0) ? true : false;
    380     }
    381 
    382     private boolean showVerifierSetting() {
    383         return Settings.Global.getInt(getContentResolver(),
    384                                       Settings.Global.PACKAGE_VERIFIER_SETTING_VISIBLE, 1) > 0;
    385     }
    386 
    387     private void warnAppInstallation() {
    388         // TODO: DialogFragment?
    389         mWarnInstallApps = new AlertDialog.Builder(getActivity()).setTitle(
    390                 getResources().getString(R.string.error_title))
    391                 .setIcon(com.android.internal.R.drawable.ic_dialog_alert)
    392                 .setMessage(getResources().getString(R.string.install_all_warning))
    393                 .setPositiveButton(android.R.string.yes, this)
    394                 .setNegativeButton(android.R.string.no, null)
    395                 .show();
    396     }
    397 
    398     @Override
    399     public void onClick(DialogInterface dialog, int which) {
    400         if (dialog == mWarnInstallApps && which == DialogInterface.BUTTON_POSITIVE) {
    401             setNonMarketAppsAllowed(true);
    402             if (mToggleAppInstallation != null) {
    403                 mToggleAppInstallation.setChecked(true);
    404             }
    405         }
    406     }
    407 
    408     @Override
    409     public void onDestroy() {
    410         super.onDestroy();
    411         if (mWarnInstallApps != null) {
    412             mWarnInstallApps.dismiss();
    413         }
    414     }
    415 
    416     private void setupLockAfterPreference() {
    417         // Compatible with pre-Froyo
    418         long currentTimeout = Settings.Secure.getLong(getContentResolver(),
    419                 Settings.Secure.LOCK_SCREEN_LOCK_AFTER_TIMEOUT, 5000);
    420         mLockAfter.setValue(String.valueOf(currentTimeout));
    421         mLockAfter.setOnPreferenceChangeListener(this);
    422         final long adminTimeout = (mDPM != null ? mDPM.getMaximumTimeToLock(null) : 0);
    423         final long displayTimeout = Math.max(0,
    424                 Settings.System.getInt(getContentResolver(), SCREEN_OFF_TIMEOUT, 0));
    425         if (adminTimeout > 0) {
    426             // This setting is a slave to display timeout when a device policy is enforced.
    427             // As such, maxLockTimeout = adminTimeout - displayTimeout.
    428             // If there isn't enough time, shows "immediately" setting.
    429             disableUnusableTimeouts(Math.max(0, adminTimeout - displayTimeout));
    430         }
    431     }
    432 
    433     private void updateLockAfterPreferenceSummary() {
    434         // Update summary message with current value
    435         long currentTimeout = Settings.Secure.getLong(getContentResolver(),
    436                 Settings.Secure.LOCK_SCREEN_LOCK_AFTER_TIMEOUT, 5000);
    437         final CharSequence[] entries = mLockAfter.getEntries();
    438         final CharSequence[] values = mLockAfter.getEntryValues();
    439         int best = 0;
    440         for (int i = 0; i < values.length; i++) {
    441             long timeout = Long.valueOf(values[i].toString());
    442             if (currentTimeout >= timeout) {
    443                 best = i;
    444             }
    445         }
    446         mLockAfter.setSummary(getString(R.string.lock_after_timeout_summary, entries[best]));
    447     }
    448 
    449     private void disableUnusableTimeouts(long maxTimeout) {
    450         final CharSequence[] entries = mLockAfter.getEntries();
    451         final CharSequence[] values = mLockAfter.getEntryValues();
    452         ArrayList<CharSequence> revisedEntries = new ArrayList<CharSequence>();
    453         ArrayList<CharSequence> revisedValues = new ArrayList<CharSequence>();
    454         for (int i = 0; i < values.length; i++) {
    455             long timeout = Long.valueOf(values[i].toString());
    456             if (timeout <= maxTimeout) {
    457                 revisedEntries.add(entries[i]);
    458                 revisedValues.add(values[i]);
    459             }
    460         }
    461         if (revisedEntries.size() != entries.length || revisedValues.size() != values.length) {
    462             mLockAfter.setEntries(
    463                     revisedEntries.toArray(new CharSequence[revisedEntries.size()]));
    464             mLockAfter.setEntryValues(
    465                     revisedValues.toArray(new CharSequence[revisedValues.size()]));
    466             final int userPreference = Integer.valueOf(mLockAfter.getValue());
    467             if (userPreference <= maxTimeout) {
    468                 mLockAfter.setValue(String.valueOf(userPreference));
    469             } else {
    470                 // There will be no highlighted selection since nothing in the list matches
    471                 // maxTimeout. The user can still select anything less than maxTimeout.
    472                 // TODO: maybe append maxTimeout to the list and mark selected.
    473             }
    474         }
    475         mLockAfter.setEnabled(revisedEntries.size() > 0);
    476     }
    477 
    478     @Override
    479     public void onResume() {
    480         super.onResume();
    481 
    482         // Make sure we reload the preference hierarchy since some of these settings
    483         // depend on others...
    484         createPreferenceHierarchy();
    485 
    486         final LockPatternUtils lockPatternUtils = mChooseLockSettingsHelper.utils();
    487         if (mBiometricWeakLiveliness != null) {
    488             mBiometricWeakLiveliness.setChecked(
    489                     lockPatternUtils.isBiometricWeakLivelinessEnabled());
    490         }
    491         if (mVisiblePattern != null) {
    492             mVisiblePattern.setChecked(lockPatternUtils.isVisiblePatternEnabled());
    493         }
    494         if (mPowerButtonInstantlyLocks != null) {
    495             mPowerButtonInstantlyLocks.setChecked(lockPatternUtils.getPowerButtonInstantlyLocks());
    496         }
    497 
    498         if (mShowPassword != null) {
    499             mShowPassword.setChecked(Settings.System.getInt(getContentResolver(),
    500                     Settings.System.TEXT_SHOW_PASSWORD, 1) != 0);
    501         }
    502 
    503         if (mResetCredentials != null) {
    504             mResetCredentials.setEnabled(!mKeyStore.isEmpty());
    505         }
    506 
    507         if (mEnableKeyguardWidgets != null) {
    508             mEnableKeyguardWidgets.setChecked(lockPatternUtils.getWidgetsEnabled());
    509         }
    510     }
    511 
    512     @Override
    513     public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
    514         if (ensurePinRestrictedPreference(preference)) {
    515             return true;
    516         }
    517         final String key = preference.getKey();
    518 
    519         final LockPatternUtils lockPatternUtils = mChooseLockSettingsHelper.utils();
    520         if (KEY_UNLOCK_SET_OR_CHANGE.equals(key)) {
    521             startFragment(this, "com.android.settings.ChooseLockGeneric$ChooseLockGenericFragment",
    522                     SET_OR_CHANGE_LOCK_METHOD_REQUEST, null);
    523         } else if (KEY_BIOMETRIC_WEAK_IMPROVE_MATCHING.equals(key)) {
    524             ChooseLockSettingsHelper helper =
    525                     new ChooseLockSettingsHelper(this.getActivity(), this);
    526             if (!helper.launchConfirmationActivity(
    527                     CONFIRM_EXISTING_FOR_BIOMETRIC_WEAK_IMPROVE_REQUEST, null, null)) {
    528                 // If this returns false, it means no password confirmation is required, so
    529                 // go ahead and start improve.
    530                 // Note: currently a backup is required for biometric_weak so this code path
    531                 // can't be reached, but is here in case things change in the future
    532                 startBiometricWeakImprove();
    533             }
    534         } else if (KEY_BIOMETRIC_WEAK_LIVELINESS.equals(key)) {
    535             if (isToggled(preference)) {
    536                 lockPatternUtils.setBiometricWeakLivelinessEnabled(true);
    537             } else {
    538                 // In this case the user has just unchecked the checkbox, but this action requires
    539                 // them to confirm their password.  We need to re-check the checkbox until
    540                 // they've confirmed their password
    541                 mBiometricWeakLiveliness.setChecked(true);
    542                 ChooseLockSettingsHelper helper =
    543                         new ChooseLockSettingsHelper(this.getActivity(), this);
    544                 if (!helper.launchConfirmationActivity(
    545                                 CONFIRM_EXISTING_FOR_BIOMETRIC_WEAK_LIVELINESS_OFF, null, null)) {
    546                     // If this returns false, it means no password confirmation is required, so
    547                     // go ahead and uncheck it here.
    548                     // Note: currently a backup is required for biometric_weak so this code path
    549                     // can't be reached, but is here in case things change in the future
    550                     lockPatternUtils.setBiometricWeakLivelinessEnabled(false);
    551                     mBiometricWeakLiveliness.setChecked(false);
    552                 }
    553             }
    554         } else if (KEY_LOCK_ENABLED.equals(key)) {
    555             lockPatternUtils.setLockPatternEnabled(isToggled(preference));
    556         } else if (KEY_VISIBLE_PATTERN.equals(key)) {
    557             lockPatternUtils.setVisiblePatternEnabled(isToggled(preference));
    558         } else if (KEY_POWER_INSTANTLY_LOCKS.equals(key)) {
    559             lockPatternUtils.setPowerButtonInstantlyLocks(isToggled(preference));
    560         } else if (KEY_ENABLE_WIDGETS.equals(key)) {
    561             lockPatternUtils.setWidgetsEnabled(mEnableKeyguardWidgets.isChecked());
    562         } else if (preference == mShowPassword) {
    563             Settings.System.putInt(getContentResolver(), Settings.System.TEXT_SHOW_PASSWORD,
    564                     mShowPassword.isChecked() ? 1 : 0);
    565         } else if (preference == mToggleAppInstallation) {
    566             if (mToggleAppInstallation.isChecked()) {
    567                 mToggleAppInstallation.setChecked(false);
    568                 warnAppInstallation();
    569             } else {
    570                 setNonMarketAppsAllowed(false);
    571             }
    572         } else if (KEY_TOGGLE_VERIFY_APPLICATIONS.equals(key)) {
    573             Settings.Global.putInt(getContentResolver(), Settings.Global.PACKAGE_VERIFIER_ENABLE,
    574                     mToggleVerifyApps.isChecked() ? 1 : 0);
    575         } else {
    576             // If we didn't handle it, let preferences handle it.
    577             return super.onPreferenceTreeClick(preferenceScreen, preference);
    578         }
    579 
    580         return true;
    581     }
    582 
    583     private boolean isToggled(Preference pref) {
    584         return ((CheckBoxPreference) pref).isChecked();
    585     }
    586 
    587     /**
    588      * see confirmPatternThenDisableAndClear
    589      */
    590     @Override
    591     public void onActivityResult(int requestCode, int resultCode, Intent data) {
    592         super.onActivityResult(requestCode, resultCode, data);
    593         if (requestCode == CONFIRM_EXISTING_FOR_BIOMETRIC_WEAK_IMPROVE_REQUEST &&
    594                 resultCode == Activity.RESULT_OK) {
    595             startBiometricWeakImprove();
    596             return;
    597         } else if (requestCode == CONFIRM_EXISTING_FOR_BIOMETRIC_WEAK_LIVELINESS_OFF &&
    598                 resultCode == Activity.RESULT_OK) {
    599             final LockPatternUtils lockPatternUtils = mChooseLockSettingsHelper.utils();
    600             lockPatternUtils.setBiometricWeakLivelinessEnabled(false);
    601             // Setting the mBiometricWeakLiveliness checked value to false is handled when onResume
    602             // is called by grabbing the value from lockPatternUtils.  We can't set it here
    603             // because mBiometricWeakLiveliness could be null
    604             return;
    605         }
    606         createPreferenceHierarchy();
    607     }
    608 
    609     @Override
    610     public boolean onPreferenceChange(Preference preference, Object value) {
    611         if (preference == mLockAfter) {
    612             int timeout = Integer.parseInt((String) value);
    613             try {
    614                 Settings.Secure.putInt(getContentResolver(),
    615                         Settings.Secure.LOCK_SCREEN_LOCK_AFTER_TIMEOUT, timeout);
    616             } catch (NumberFormatException e) {
    617                 Log.e("SecuritySettings", "could not persist lockAfter timeout setting", e);
    618             }
    619             updateLockAfterPreferenceSummary();
    620         }
    621         return true;
    622     }
    623 
    624     @Override
    625     protected int getHelpResource() {
    626         return R.string.help_url_security;
    627     }
    628 
    629     public void startBiometricWeakImprove(){
    630         Intent intent = new Intent();
    631         intent.setClassName("com.android.facelock", "com.android.facelock.AddToSetup");
    632         startActivity(intent);
    633     }
    634 }
    635