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.AlertDialog;
  23 import android.app.admin.DevicePolicyManager;
  24 import android.content.Context;
  25 import android.content.DialogInterface;
  26 import android.content.Intent;
  27 import android.os.Bundle;
  28 import android.os.Vibrator;
  29 import android.preference.CheckBoxPreference;
  30 import android.preference.ListPreference;
  31 import android.preference.Preference;
  32 import android.preference.Preference.OnPreferenceChangeListener;
  33 import android.preference.PreferenceGroup;
  34 import android.preference.PreferenceScreen;
  35 import android.provider.Settings;
  36 import android.security.KeyStore;
  37 import android.telephony.TelephonyManager;
  38 import android.util.Log;
  39
  40 import com.android.internal.telephony.Phone;
  41 import com.android.internal.widget.LockPatternUtils;
  42
  43 import java.util.ArrayList;
  44
  45 /**
  46  * Gesture lock pattern settings.
  47  */
  48 public class SecuritySettings extends SettingsPreferenceFragment
  49         implements OnPreferenceChangeListener, DialogInterface.OnClickListener {
  50
  51     // Lock Settings
  52     private static final String KEY_UNLOCK_SET_OR_CHANGE = "unlock_set_or_change";
  53     private static final String KEY_LOCK_ENABLED = "lockenabled";
  54     private static final String KEY_VISIBLE_PATTERN = "visiblepattern";
  55     private static final String KEY_TACTILE_FEEDBACK_ENABLED = "unlock_tactile_feedback";
  56     private static final String KEY_SECURITY_CATEGORY = "security_category";
  57     private static final String KEY_LOCK_AFTER_TIMEOUT = "lock_after_timeout";
  58     private static final int SET_OR_CHANGE_LOCK_METHOD_REQUEST = 123;
  59
  60     // Misc Settings
  61     private static final String KEY_SIM_LOCK = "sim_lock";
  62     private static final String KEY_SHOW_PASSWORD = "show_password";
  63     private static final String KEY_RESET_CREDENTIALS = "reset_credentials";
  64     private static final String KEY_TOGGLE_INSTALL_APPLICATIONS = "toggle_install_applications";
  65
  66     DevicePolicyManager mDPM;
  67
  68     private ChooseLockSettingsHelper mChooseLockSettingsHelper;
  69     private LockPatternUtils mLockPatternUtils;
  70     private ListPreference mLockAfter;
  71
  72     private CheckBoxPreference mVisiblePattern;
  73     private CheckBoxPreference mTactileFeedback;
  74
  75     private CheckBoxPreference mShowPassword;
  76
  77     private Preference mResetCredentials;
  78
  79     private CheckBoxPreference mToggleAppInstallation;
  80     private DialogInterface mWarnInstallApps;
  81
  82     @Override
  83     public void onCreate(Bundle savedInstanceState) {
  84         super.onCreate(savedInstanceState);
  85
  86         mLockPatternUtils = new LockPatternUtils(getActivity());
  87
  88         mDPM = (DevicePolicyManager)getSystemService(Context.DEVICE_POLICY_SERVICE);
  89
  90         mChooseLockSettingsHelper = new ChooseLockSettingsHelper(getActivity());
  91     }
  92
  93     private PreferenceScreen createPreferenceHierarchy() {
  94         PreferenceScreen root = getPreferenceScreen();
  95         if (root != null) {
  96             root.removeAll();
  97         }
  98         addPreferencesFromResource(R.xml.security_settings);
  99         root = getPreferenceScreen();
 100
 101         // Add options for lock/unlock screen
 102         int resid = 0;
 103         if (!mLockPatternUtils.isSecure()) {
 104             if (mLockPatternUtils.isLockScreenDisabled()) {
 105                 resid = R.xml.security_settings_lockscreen;
 106             } else {
 107                 resid = R.xml.security_settings_chooser;
 108             }
 109         } else {
 110             switch (mLockPatternUtils.getKeyguardStoredPasswordQuality()) {
 111                 case DevicePolicyManager.PASSWORD_QUALITY_SOMETHING:
 112                     resid = R.xml.security_settings_pattern;
 113                     break;
 114                 case DevicePolicyManager.PASSWORD_QUALITY_NUMERIC:
 115                     resid = R.xml.security_settings_pin;
 116                     break;
 117                 case DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC:
 118                 case DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC:
 119                 case DevicePolicyManager.PASSWORD_QUALITY_COMPLEX:
 120                     resid = R.xml.security_settings_password;
 121                     break;
 122             }
 123         }
 124         addPreferencesFromResource(resid);
 125
 126
 127         // Add options for device encryption
 128         DevicePolicyManager dpm =
 129                 (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
 130
 131         switch (dpm.getStorageEncryptionStatus()) {
 132         case DevicePolicyManager.ENCRYPTION_STATUS_ACTIVE:
 133             // The device is currently encrypted.
 134             addPreferencesFromResource(R.xml.security_settings_encrypted);
 135             break;
 136         case DevicePolicyManager.ENCRYPTION_STATUS_INACTIVE:
 137             // This device supports encryption but isn't encrypted.
 138             addPreferencesFromResource(R.xml.security_settings_unencrypted);
 139             break;
 140         }
 141
 142         // lock after preference
 143         mLockAfter = (ListPreference) root.findPreference(KEY_LOCK_AFTER_TIMEOUT);
 144         if (mLockAfter != null) {
 145             setupLockAfterPreference();
 146             updateLockAfterPreferenceSummary();
 147         }
 148
 149         // visible pattern
 150         mVisiblePattern = (CheckBoxPreference) root.findPreference(KEY_VISIBLE_PATTERN);
 151
 152         // tactile feedback. Should be common to all unlock preference screens.
 153         mTactileFeedback = (CheckBoxPreference) root.findPreference(KEY_TACTILE_FEEDBACK_ENABLED);
 154         if (!((Vibrator) getSystemService(Context.VIBRATOR_SERVICE)).hasVibrator()) {
 155             PreferenceGroup securityCategory = (PreferenceGroup)
 156                     root.findPreference(KEY_SECURITY_CATEGORY);
 157             if (securityCategory != null && mTactileFeedback != null) {
 158                 securityCategory.removePreference(mTactileFeedback);
 159             }
 160         }
 161
 162         // Append the rest of the settings
 163         addPreferencesFromResource(R.xml.security_settings_misc);
 164
 165         // Do not display SIM lock for CDMA phone
 166         TelephonyManager tm = TelephonyManager.getDefault();
 167         if ((TelephonyManager.PHONE_TYPE_CDMA == tm.getCurrentPhoneType()) &&
 168                 (tm.getLteOnCdmaMode() != Phone.LTE_ON_CDMA_TRUE)) {
 169             root.removePreference(root.findPreference(KEY_SIM_LOCK));
 170         }
 171
 172         // Show password
 173         mShowPassword = (CheckBoxPreference) root.findPreference(KEY_SHOW_PASSWORD);
 174
 175         // Credential storage
 176         mResetCredentials = root.findPreference(KEY_RESET_CREDENTIALS);
 177
 178         mToggleAppInstallation = (CheckBoxPreference) findPreference(
 179                 KEY_TOGGLE_INSTALL_APPLICATIONS);
 180         mToggleAppInstallation.setChecked(isNonMarketAppsAllowed());
 181
 182         return root;
 183     }
 184
 185     private boolean isNonMarketAppsAllowed() {
 186         return Settings.Secure.getInt(getContentResolver(),
 187                                       Settings.Secure.INSTALL_NON_MARKET_APPS, 0) > 0;
 188     }
 189
 190     private void setNonMarketAppsAllowed(boolean enabled) {
 191         // Change the system setting
 192         Settings.Secure.putInt(getContentResolver(), Settings.Secure.INSTALL_NON_MARKET_APPS,
 193                                 enabled ? 1 : 0);
 194     }
 195
 196     private void warnAppInstallation() {
 197         // TODO: DialogFragment?
 198         mWarnInstallApps = new AlertDialog.Builder(getActivity()).setTitle(
 199                 getResources().getString(R.string.error_title))
 200                 .setIcon(com.android.internal.R.drawable.ic_dialog_alert)
 201                 .setMessage(getResources().getString(R.string.install_all_warning))
 202                 .setPositiveButton(android.R.string.yes, this)
 203                 .setNegativeButton(android.R.string.no, null)
 204                 .show();
 205     }
 206
 207     public void onClick(DialogInterface dialog, int which) {
 208         if (dialog == mWarnInstallApps && which == DialogInterface.BUTTON_POSITIVE) {
 209             setNonMarketAppsAllowed(true);
 210             mToggleAppInstallation.setChecked(true);
 211         }
 212     }
 213
 214     @Override
 215     public void onDestroy() {
 216         super.onDestroy();
 217         if (mWarnInstallApps != null) {
 218             mWarnInstallApps.dismiss();
 219         }
 220     }
 221
 222     private void setupLockAfterPreference() {
 223         // Compatible with pre-Froyo
 224         long currentTimeout = Settings.Secure.getLong(getContentResolver(),
 225                 Settings.Secure.LOCK_SCREEN_LOCK_AFTER_TIMEOUT, 5000);
 226         mLockAfter.setValue(String.valueOf(currentTimeout));
 227         mLockAfter.setOnPreferenceChangeListener(this);
 228         final long adminTimeout = (mDPM != null ? mDPM.getMaximumTimeToLock(null) : 0);
 229         final long displayTimeout = Math.max(0,
 230                 Settings.System.getInt(getContentResolver(), SCREEN_OFF_TIMEOUT, 0));
 231         if (adminTimeout > 0) {
 232             // This setting is a slave to display timeout when a device policy is enforced.
 233             // As such, maxLockTimeout = adminTimeout - displayTimeout.
 234             // If there isn't enough time, shows "immediately" setting.
 235             disableUnusableTimeouts(Math.max(0, adminTimeout - displayTimeout));
 236         }
 237     }
 238
 239     private void updateLockAfterPreferenceSummary() {
 240         // Update summary message with current value
 241         long currentTimeout = Settings.Secure.getLong(getContentResolver(),
 242                 Settings.Secure.LOCK_SCREEN_LOCK_AFTER_TIMEOUT, 5000);
 243         final CharSequence[] entries = mLockAfter.getEntries();
 244         final CharSequence[] values = mLockAfter.getEntryValues();
 245         int best = 0;
 246         for (int i = 0; i < values.length; i++) {
 247             long timeout = Long.valueOf(values[i].toString());
 248             if (currentTimeout >= timeout) {
 249                 best = i;
 250             }
 251         }
 252         mLockAfter.setSummary(getString(R.string.lock_after_timeout_summary, entries[best]));
 253     }
 254
 255     private void disableUnusableTimeouts(long maxTimeout) {
 256         final CharSequence[] entries = mLockAfter.getEntries();
 257         final CharSequence[] values = mLockAfter.getEntryValues();
 258         ArrayList<CharSequence> revisedEntries = new ArrayList<CharSequence>();
 259         ArrayList<CharSequence> revisedValues = new ArrayList<CharSequence>();
 260         for (int i = 0; i < values.length; i++) {
 261             long timeout = Long.valueOf(values[i].toString());
 262             if (timeout <= maxTimeout) {
 263                 revisedEntries.add(entries[i]);
 264                 revisedValues.add(values[i]);
 265             }
 266         }
 267         if (revisedEntries.size() != entries.length || revisedValues.size() != values.length) {
 268             mLockAfter.setEntries(
 269                     revisedEntries.toArray(new CharSequence[revisedEntries.size()]));
 270             mLockAfter.setEntryValues(
 271                     revisedValues.toArray(new CharSequence[revisedValues.size()]));
 272             final int userPreference = Integer.valueOf(mLockAfter.getValue());
 273             if (userPreference <= maxTimeout) {
 274                 mLockAfter.setValue(String.valueOf(userPreference));
 275             } else {
 276                 // There will be no highlighted selection since nothing in the list matches
 277                 // maxTimeout. The user can still select anything less than maxTimeout.
 278                 // TODO: maybe append maxTimeout to the list and mark selected.
 279             }
 280         }
 281         mLockAfter.setEnabled(revisedEntries.size() > 0);
 282     }
 283
 284     @Override
 285     public void onResume() {
 286         super.onResume();
 287
 288         // Make sure we reload the preference hierarchy since some of these settings
 289         // depend on others...
 290         createPreferenceHierarchy();
 291
 292         final LockPatternUtils lockPatternUtils = mChooseLockSettingsHelper.utils();
 293         if (mVisiblePattern != null) {
 294             mVisiblePattern.setChecked(lockPatternUtils.isVisiblePatternEnabled());
 295         }
 296         if (mTactileFeedback != null) {
 297             mTactileFeedback.setChecked(lockPatternUtils.isTactileFeedbackEnabled());
 298         }
 299
 300         mShowPassword.setChecked(Settings.System.getInt(getContentResolver(),
 301                 Settings.System.TEXT_SHOW_PASSWORD, 1) != 0);
 302
 303         KeyStore.State state = KeyStore.getInstance().state();
 304         mResetCredentials.setEnabled(state != KeyStore.State.UNINITIALIZED);
 305     }
 306
 307     @Override
 308     public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
 309         final String key = preference.getKey();
 310
 311         final LockPatternUtils lockPatternUtils = mChooseLockSettingsHelper.utils();
 312         if (KEY_UNLOCK_SET_OR_CHANGE.equals(key)) {
 313             startFragment(this, "com.android.settings.ChooseLockGeneric$ChooseLockGenericFragment",
 314                     SET_OR_CHANGE_LOCK_METHOD_REQUEST, null);
 315         } else if (KEY_LOCK_ENABLED.equals(key)) {
 316             lockPatternUtils.setLockPatternEnabled(isToggled(preference));
 317         } else if (KEY_VISIBLE_PATTERN.equals(key)) {
 318             lockPatternUtils.setVisiblePatternEnabled(isToggled(preference));
 319         } else if (KEY_TACTILE_FEEDBACK_ENABLED.equals(key)) {
 320             lockPatternUtils.setTactileFeedbackEnabled(isToggled(preference));
 321         } else if (preference == mShowPassword) {
 322             Settings.System.putInt(getContentResolver(), Settings.System.TEXT_SHOW_PASSWORD,
 323                     mShowPassword.isChecked() ? 1 : 0);
 324         } else if (preference == mToggleAppInstallation) {
 325             if (mToggleAppInstallation.isChecked()) {
 326                 mToggleAppInstallation.setChecked(false);
 327                 warnAppInstallation();
 328             } else {
 329                 setNonMarketAppsAllowed(false);
 330             }
 331         } else {
 332             // If we didn't handle it, let preferences handle it.
 333             return super.onPreferenceTreeClick(preferenceScreen, preference);
 334         }
 335
 336         return true;
 337     }
 338
 339     private boolean isToggled(Preference pref) {
 340         return ((CheckBoxPreference) pref).isChecked();
 341     }
 342
 343     /**
 344      * see confirmPatternThenDisableAndClear
 345      */
 346     @Override
 347     public void onActivityResult(int requestCode, int resultCode, Intent data) {
 348         super.onActivityResult(requestCode, resultCode, data);
 349         createPreferenceHierarchy();
 350     }
 351
 352     public boolean onPreferenceChange(Preference preference, Object value) {
 353         if (preference == mLockAfter) {
 354             int timeout = Integer.parseInt((String) value);
 355             try {
 356                 Settings.Secure.putInt(getContentResolver(),
 357                         Settings.Secure.LOCK_SCREEN_LOCK_AFTER_TIMEOUT, timeout);
 358             } catch (NumberFormatException e) {
 359                 Log.e("SecuritySettings", "could not persist lockAfter timeout setting", e);
 360             }
 361             updateLockAfterPreferenceSummary();
 362         }
 363         return true;
 364     }
 365 }