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