src/com/android/settings/SecuritySettings.java

   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.admin.DevicePolicyManager;
  23 import android.content.Context;
  24 import android.content.Intent;
  25 import android.os.Bundle;
  26 import android.os.Vibrator;
  27 import android.preference.CheckBoxPreference;
  28 import android.preference.ListPreference;
  29 import android.preference.Preference;
  30 import android.preference.Preference.OnPreferenceChangeListener;
  31 import android.preference.PreferenceGroup;
  32 import android.preference.PreferenceScreen;
  33 import android.provider.Settings;
  34 import android.security.KeyStore;
  35 import android.telephony.TelephonyManager;
  36 import android.util.Log;
  37
  38 import com.android.internal.widget.LockPatternUtils;
  39
  40 import java.util.ArrayList;
  41
  42 /**
  43  * Gesture lock pattern settings.
  44  */
  45 public class SecuritySettings extends SettingsPreferenceFragment
  46         implements OnPreferenceChangeListener {
  47
  48     // Lock Settings
  49     private static final String KEY_UNLOCK_SET_OR_CHANGE = "unlock_set_or_change";
  50     private static final String KEY_LOCK_ENABLED = "lockenabled";
  51     private static final String KEY_VISIBLE_PATTERN = "visiblepattern";
  52     private static final String KEY_TACTILE_FEEDBACK_ENABLED = "unlock_tactile_feedback";
  53     private static final String KEY_SECURITY_CATEGORY = "security_category";
  54     private static final String KEY_LOCK_AFTER_TIMEOUT = "lock_after_timeout";
  55     private static final int SET_OR_CHANGE_LOCK_METHOD_REQUEST = 123;
  56
  57     // Misc Settings
  58     private static final String KEY_SIM_LOCK = "sim_lock";
  59     private static final String KEY_SHOW_PASSWORD = "show_password";
  60     private static final String KEY_RESET_CREDENTIALS = "reset_credentials";
  61
  62     DevicePolicyManager mDPM;
  63
  64     private ChooseLockSettingsHelper mChooseLockSettingsHelper;
  65     private LockPatternUtils mLockPatternUtils;
  66     private ListPreference mLockAfter;
  67
  68     private CheckBoxPreference mVisiblePattern;
  69     private CheckBoxPreference mTactileFeedback;
  70
  71     private CheckBoxPreference mShowPassword;
  72
  73     private Preference mResetCredentials;
  74
  75     @Override
  76     public void onCreate(Bundle savedInstanceState) {
  77         super.onCreate(savedInstanceState);
  78
  79         mLockPatternUtils = new LockPatternUtils(getActivity());
  80
  81         mDPM = (DevicePolicyManager)getSystemService(Context.DEVICE_POLICY_SERVICE);
  82
  83         mChooseLockSettingsHelper = new ChooseLockSettingsHelper(getActivity());
  84     }
  85
  86     private PreferenceScreen createPreferenceHierarchy() {
  87         PreferenceScreen root = getPreferenceScreen();
  88         if (root != null) {
  89             root.removeAll();
  90         }
  91         addPreferencesFromResource(R.xml.security_settings);
  92         root = getPreferenceScreen();
  93
  94         // Add options for lock/unlock screen
  95         int resid = 0;
  96         if (!mLockPatternUtils.isSecure()) {
  97             if (mLockPatternUtils.isLockScreenDisabled()) {
  98                 resid = R.xml.security_settings_lockscreen;
  99             } else {
 100                 resid = R.xml.security_settings_chooser;
 101             }
 102         } else {
 103             switch (mLockPatternUtils.getKeyguardStoredPasswordQuality()) {
 104                 case DevicePolicyManager.PASSWORD_QUALITY_SOMETHING:
 105                     resid = R.xml.security_settings_pattern;
 106                     break;
 107                 case DevicePolicyManager.PASSWORD_QUALITY_NUMERIC:
 108                     resid = R.xml.security_settings_pin;
 109                     break;
 110                 case DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC:
 111                 case DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC:
 112                 case DevicePolicyManager.PASSWORD_QUALITY_COMPLEX:
 113                     resid = R.xml.security_settings_password;
 114                     break;
 115             }
 116         }
 117         addPreferencesFromResource(resid);
 118
 119
 120         // Add options for device encryption
 121         DevicePolicyManager dpm =
 122                 (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
 123
 124         switch (dpm.getStorageEncryptionStatus()) {
 125         case DevicePolicyManager.ENCRYPTION_STATUS_ACTIVE:
 126             // The device is currently encrypted.
 127             addPreferencesFromResource(R.xml.security_settings_encrypted);
 128             break;
 129         case DevicePolicyManager.ENCRYPTION_STATUS_INACTIVE:
 130             // This device supports encryption but isn't encrypted.
 131             addPreferencesFromResource(R.xml.security_settings_unencrypted);
 132             break;
 133         }
 134
 135         // lock after preference
 136         mLockAfter = (ListPreference) root.findPreference(KEY_LOCK_AFTER_TIMEOUT);
 137         if (mLockAfter != null) {
 138             setupLockAfterPreference();
 139             updateLockAfterPreferenceSummary();
 140         }
 141
 142         // visible pattern
 143         mVisiblePattern = (CheckBoxPreference) root.findPreference(KEY_VISIBLE_PATTERN);
 144
 145         // tactile feedback. Should be common to all unlock preference screens.
 146         mTactileFeedback = (CheckBoxPreference) root.findPreference(KEY_TACTILE_FEEDBACK_ENABLED);
 147         if (!((Vibrator) getSystemService(Context.VIBRATOR_SERVICE)).hasVibrator()) {
 148             PreferenceGroup securityCategory = (PreferenceGroup)
 149                     root.findPreference(KEY_SECURITY_CATEGORY);
 150             if (securityCategory != null && mTactileFeedback != null) {
 151                 securityCategory.removePreference(mTactileFeedback);
 152             }
 153         }
 154
 155         // Append the rest of the settings
 156         addPreferencesFromResource(R.xml.security_settings_misc);
 157
 158         // Do not display SIM lock for CDMA phone
 159         if (TelephonyManager.PHONE_TYPE_CDMA ==
 160                 TelephonyManager.getDefault().getCurrentPhoneType()) {
 161             root.removePreference(root.findPreference(KEY_SIM_LOCK));
 162         }
 163
 164         // Show password
 165         mShowPassword = (CheckBoxPreference) root.findPreference(KEY_SHOW_PASSWORD);
 166
 167         // Credential storage
 168         mResetCredentials = root.findPreference(KEY_RESET_CREDENTIALS);
 169
 170         return root;
 171     }
 172
 173     private void setupLockAfterPreference() {
 174         // Compatible with pre-Froyo
 175         long currentTimeout = Settings.Secure.getLong(getContentResolver(),
 176                 Settings.Secure.LOCK_SCREEN_LOCK_AFTER_TIMEOUT, 5000);
 177         mLockAfter.setValue(String.valueOf(currentTimeout));
 178         mLockAfter.setOnPreferenceChangeListener(this);
 179         final long adminTimeout = (mDPM != null ? mDPM.getMaximumTimeToLock(null) : 0);
 180         final long displayTimeout = Math.max(0,
 181                 Settings.System.getInt(getContentResolver(), SCREEN_OFF_TIMEOUT, 0));
 182         if (adminTimeout > 0) {
 183             // This setting is a slave to display timeout when a device policy is enforced.
 184             // As such, maxLockTimeout = adminTimeout - displayTimeout.
 185             // If there isn't enough time, shows "immediately" setting.
 186             disableUnusableTimeouts(Math.max(0, adminTimeout - displayTimeout));
 187         }
 188     }
 189
 190     private void updateLockAfterPreferenceSummary() {
 191         // Update summary message with current value
 192         long currentTimeout = Settings.Secure.getLong(getContentResolver(),
 193                 Settings.Secure.LOCK_SCREEN_LOCK_AFTER_TIMEOUT, 0);
 194         final CharSequence[] entries = mLockAfter.getEntries();
 195         final CharSequence[] values = mLockAfter.getEntryValues();
 196         int best = 0;
 197         for (int i = 0; i < values.length; i++) {
 198             long timeout = Long.valueOf(values[i].toString());
 199             if (currentTimeout >= timeout) {
 200                 best = i;
 201             }
 202         }
 203         mLockAfter.setSummary(getString(R.string.lock_after_timeout_summary, entries[best]));
 204     }
 205
 206     private void disableUnusableTimeouts(long maxTimeout) {
 207         final CharSequence[] entries = mLockAfter.getEntries();
 208         final CharSequence[] values = mLockAfter.getEntryValues();
 209         ArrayList<CharSequence> revisedEntries = new ArrayList<CharSequence>();
 210         ArrayList<CharSequence> revisedValues = new ArrayList<CharSequence>();
 211         for (int i = 0; i < values.length; i++) {
 212             long timeout = Long.valueOf(values[i].toString());
 213             if (timeout <= maxTimeout) {
 214                 revisedEntries.add(entries[i]);
 215                 revisedValues.add(values[i]);
 216             }
 217         }
 218         if (revisedEntries.size() != entries.length || revisedValues.size() != values.length) {
 219             mLockAfter.setEntries(
 220                     revisedEntries.toArray(new CharSequence[revisedEntries.size()]));
 221             mLockAfter.setEntryValues(
 222                     revisedValues.toArray(new CharSequence[revisedValues.size()]));
 223             final int userPreference = Integer.valueOf(mLockAfter.getValue());
 224             if (userPreference <= maxTimeout) {
 225                 mLockAfter.setValue(String.valueOf(userPreference));
 226             } else {
 227                 // There will be no highlighted selection since nothing in the list matches
 228                 // maxTimeout. The user can still select anything less than maxTimeout.
 229                 // TODO: maybe append maxTimeout to the list and mark selected.
 230             }
 231         }
 232         mLockAfter.setEnabled(revisedEntries.size() > 0);
 233     }
 234
 235     @Override
 236     public void onResume() {
 237         super.onResume();
 238
 239         // Make sure we reload the preference hierarchy since some of these settings
 240         // depend on others...
 241         createPreferenceHierarchy();
 242
 243         final LockPatternUtils lockPatternUtils = mChooseLockSettingsHelper.utils();
 244         if (mVisiblePattern != null) {
 245             mVisiblePattern.setChecked(lockPatternUtils.isVisiblePatternEnabled());
 246         }
 247         if (mTactileFeedback != null) {
 248             mTactileFeedback.setChecked(lockPatternUtils.isTactileFeedbackEnabled());
 249         }
 250
 251         mShowPassword.setChecked(Settings.System.getInt(getContentResolver(),
 252                 Settings.System.TEXT_SHOW_PASSWORD, 1) != 0);
 253
 254         KeyStore.State state = KeyStore.getInstance().state();
 255         mResetCredentials.setEnabled(state != KeyStore.State.UNINITIALIZED);
 256     }
 257
 258     @Override
 259     public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
 260         final String key = preference.getKey();
 261
 262         final LockPatternUtils lockPatternUtils = mChooseLockSettingsHelper.utils();
 263         if (KEY_UNLOCK_SET_OR_CHANGE.equals(key)) {
 264             startFragment(this, "com.android.settings.ChooseLockGeneric$ChooseLockGenericFragment",
 265                     SET_OR_CHANGE_LOCK_METHOD_REQUEST, null);
 266         } else if (KEY_LOCK_ENABLED.equals(key)) {
 267             lockPatternUtils.setLockPatternEnabled(isToggled(preference));
 268         } else if (KEY_VISIBLE_PATTERN.equals(key)) {
 269             lockPatternUtils.setVisiblePatternEnabled(isToggled(preference));
 270         } else if (KEY_TACTILE_FEEDBACK_ENABLED.equals(key)) {
 271             lockPatternUtils.setTactileFeedbackEnabled(isToggled(preference));
 272         } else if (preference == mShowPassword) {
 273             Settings.System.putInt(getContentResolver(), Settings.System.TEXT_SHOW_PASSWORD,
 274                     mShowPassword.isChecked() ? 1 : 0);
 275         } else {
 276             // If we didn't handle it, let preferences handle it.
 277             return super.onPreferenceTreeClick(preferenceScreen, preference);
 278         }
 279
 280         return true;
 281     }
 282
 283     private boolean isToggled(Preference pref) {
 284         return ((CheckBoxPreference) pref).isChecked();
 285     }
 286
 287     /**
 288      * see confirmPatternThenDisableAndClear
 289      */
 290     @Override
 291     public void onActivityResult(int requestCode, int resultCode, Intent data) {
 292         super.onActivityResult(requestCode, resultCode, data);
 293         createPreferenceHierarchy();
 294     }
 295
 296     public boolean onPreferenceChange(Preference preference, Object value) {
 297         if (preference == mLockAfter) {
 298             int timeout = Integer.parseInt((String) value);
 299             try {
 300                 Settings.Secure.putInt(getContentResolver(),
 301                         Settings.Secure.LOCK_SCREEN_LOCK_AFTER_TIMEOUT, timeout);
 302             } catch (NumberFormatException e) {
 303                 Log.e("SecuritySettings", "could not persist lockAfter timeout setting", e);
 304             }
 305             updateLockAfterPreferenceSummary();
 306         }
 307         return true;
 308     }
 309 }