1 /*
2  * Copyright (C) 2014 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 package com.android.settings.security;
17 
18 import static android.app.Activity.RESULT_OK;
19 
20 import android.app.admin.DevicePolicyManager;
21 import android.app.settings.SettingsEnums;
22 import android.content.Context;
23 import android.content.DialogInterface;
24 import android.content.Intent;
25 import android.content.res.Resources;
26 import android.icu.text.MessageFormat;
27 import android.os.Bundle;
28 import android.os.UserHandle;
29 import android.os.UserManager;
30 import android.provider.Settings;
31 import android.widget.CompoundButton;
32 import android.widget.CompoundButton.OnCheckedChangeListener;
33 
34 import androidx.annotation.NonNull;
35 import androidx.appcompat.app.AlertDialog;
36 import androidx.preference.Preference;
37 import androidx.preference.Preference.OnPreferenceChangeListener;
38 import androidx.preference.PreferenceScreen;
39 import androidx.preference.TwoStatePreference;
40 
41 import com.android.internal.widget.LockPatternUtils;
42 import com.android.settings.R;
43 import com.android.settings.SettingsActivity;
44 import com.android.settings.SettingsPreferenceFragment;
45 import com.android.settings.password.ChooseLockGeneric;
46 import com.android.settings.password.ChooseLockSettingsHelper;
47 import com.android.settings.search.BaseSearchIndexProvider;
48 import com.android.settings.widget.SettingsMainSwitchBar;
49 import com.android.settingslib.search.SearchIndexable;
50 import com.android.settingslib.search.SearchIndexableRaw;
51 import com.android.settingslib.widget.FooterPreference;
52 
53 import java.util.List;
54 
55 /**
56  * Screen pinning settings.
57  */
58 @SearchIndexable
59 public class ScreenPinningSettings extends SettingsPreferenceFragment
60         implements OnCheckedChangeListener, DialogInterface.OnClickListener {
61 
62     private static final String KEY_USE_SCREEN_LOCK = "use_screen_lock";
63     private static final String KEY_FOOTER = "screen_pinning_settings_screen_footer";
64     private static final int CHANGE_LOCK_METHOD_REQUEST = 43;
65     private static final int CONFIRM_REQUEST = 1000;
66 
67     private SettingsMainSwitchBar mSwitchBar;
68     private TwoStatePreference mUseScreenLock;
69     private FooterPreference mFooterPreference;
70     private LockPatternUtils mLockPatternUtils;
71     private UserManager mUserManager;
72 
73     @Override
getMetricsCategory()74     public int getMetricsCategory() {
75         return SettingsEnums.SCREEN_PINNING;
76     }
77 
78     @Override
onActivityCreated(Bundle savedInstanceState)79     public void onActivityCreated(Bundle savedInstanceState) {
80         super.onActivityCreated(savedInstanceState);
81 
82         final SettingsActivity activity = (SettingsActivity) getActivity();
83         activity.setTitle(R.string.screen_pinning_title);
84         mLockPatternUtils = new LockPatternUtils(activity);
85         mUserManager = activity.getSystemService(UserManager.class);
86 
87         addPreferencesFromResource(R.xml.screen_pinning_settings);
88         final PreferenceScreen root = getPreferenceScreen();
89         mUseScreenLock = root.findPreference(KEY_USE_SCREEN_LOCK);
90         mFooterPreference = root.findPreference(KEY_FOOTER);
91 
92         mSwitchBar = activity.getSwitchBar();
93         mSwitchBar.setTitle(getContext().getString(R.string.app_pinning_main_switch_title));
94         mSwitchBar.show();
95         mSwitchBar.setChecked(isLockToAppEnabled(getActivity()));
96         mSwitchBar.addOnSwitchChangeListener(this);
97 
98         updateDisplay();
99     }
100 
101     @Override
getHelpResource()102     public int getHelpResource() {
103         return R.string.help_url_screen_pinning;
104     }
105 
106     @Override
onDestroyView()107     public void onDestroyView() {
108         super.onDestroyView();
109 
110         mSwitchBar.removeOnSwitchChangeListener(this);
111         mSwitchBar.hide();
112     }
113 
isLockToAppEnabled(Context context)114     private static boolean isLockToAppEnabled(Context context) {
115         return Settings.System.getInt(context.getContentResolver(),
116                 Settings.System.LOCK_TO_APP_ENABLED, 0) != 0;
117     }
118 
setLockToAppEnabled(boolean isEnabled)119     private void setLockToAppEnabled(boolean isEnabled) {
120         Settings.System.putInt(getContentResolver(), Settings.System.LOCK_TO_APP_ENABLED,
121                 isEnabled ? 1 : 0);
122         if (isEnabled) {
123             // Set the value to match what we have defaulted to in the UI.
124             setScreenLockUsedSetting(isScreenLockUsed());
125         }
126     }
127 
isScreenLockUsed()128     private boolean isScreenLockUsed() {
129         // This functionality should be kept consistent with
130         // com.android.server.wm.LockTaskController (see b/127605586)
131         int defaultValueIfSettingNull = mLockPatternUtils.isSecure(UserHandle.myUserId()) ? 1 : 0;
132         return Settings.Secure.getInt(
133                 getContentResolver(),
134                 Settings.Secure.LOCK_TO_APP_EXIT_LOCKED,
135                 defaultValueIfSettingNull) != 0;
136     }
137 
setScreenLockUsed(boolean isEnabled)138     private boolean setScreenLockUsed(boolean isEnabled) {
139         LockPatternUtils lockPatternUtils = new LockPatternUtils(getActivity());
140         final int passwordQuality = lockPatternUtils
141                 .getKeyguardStoredPasswordQuality(UserHandle.myUserId());
142         if (isEnabled) {
143             if (passwordQuality == DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED) {
144                 Intent chooseLockIntent = new Intent(DevicePolicyManager.ACTION_SET_NEW_PASSWORD);
145                 chooseLockIntent.setPackage(getContext().getPackageName());
146                 chooseLockIntent.putExtra(
147                         ChooseLockGeneric.ChooseLockGenericFragment.HIDE_INSECURE_OPTIONS,
148                         true);
149                 startActivityForResult(chooseLockIntent, CHANGE_LOCK_METHOD_REQUEST);
150                 return false;
151             }
152         }  else {
153             if (passwordQuality != DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED) {
154                 final ChooseLockSettingsHelper.Builder builder =
155                         new ChooseLockSettingsHelper.Builder(getActivity(), this);
156                 return builder.setRequestCode(CONFIRM_REQUEST).show();
157             }
158         }
159         setScreenLockUsedSetting(isEnabled);
160         return true;
161     }
162 
setScreenLockUsedSetting(boolean isEnabled)163     private void setScreenLockUsedSetting(boolean isEnabled) {
164         Settings.Secure.putInt(getContentResolver(), Settings.Secure.LOCK_TO_APP_EXIT_LOCKED,
165                 isEnabled ? 1 : 0);
166     }
167 
168     @Override
onActivityResult(int requestCode, int resultCode, Intent data)169     public void onActivityResult(int requestCode, int resultCode, Intent data) {
170         super.onActivityResult(requestCode, resultCode, data);
171         if (requestCode == CHANGE_LOCK_METHOD_REQUEST) {
172             LockPatternUtils lockPatternUtils = new LockPatternUtils(getActivity());
173             boolean validPassQuality = lockPatternUtils.getKeyguardStoredPasswordQuality(
174                     UserHandle.myUserId())
175                     != DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED;
176             setScreenLockUsed(validPassQuality);
177             // Make sure the screen updates.
178             mUseScreenLock.setChecked(validPassQuality);
179         } else if (requestCode == CONFIRM_REQUEST && resultCode == RESULT_OK) {
180             setScreenLockUsedSetting(false);
181         }
182     }
183 
getCurrentSecurityTitle(LockPatternUtils lockPatternUtils)184     private static int getCurrentSecurityTitle(LockPatternUtils lockPatternUtils) {
185         int quality = lockPatternUtils.getKeyguardStoredPasswordQuality(UserHandle.myUserId());
186         switch (quality) {
187             case DevicePolicyManager.PASSWORD_QUALITY_NUMERIC:
188             case DevicePolicyManager.PASSWORD_QUALITY_NUMERIC_COMPLEX:
189                 return R.string.screen_pinning_unlock_pin;
190             case DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC:
191             case DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC:
192             case DevicePolicyManager.PASSWORD_QUALITY_COMPLEX:
193             case DevicePolicyManager.PASSWORD_QUALITY_MANAGED:
194                 return R.string.screen_pinning_unlock_password;
195             case DevicePolicyManager.PASSWORD_QUALITY_SOMETHING:
196                 if (lockPatternUtils.isLockPatternEnabled(UserHandle.myUserId())) {
197                     return R.string.screen_pinning_unlock_pattern;
198                 }
199         }
200         return R.string.screen_pinning_unlock_none;
201     }
202 
203     /**
204      * Listens to the state change of the overall lock-to-app switch.
205      */
206     @Override
onCheckedChanged(CompoundButton buttonView, boolean isChecked)207     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
208         if (isChecked) {
209             new AlertDialog.Builder(getContext())
210                     .setMessage(R.string.screen_pinning_dialog_message)
211                     .setPositiveButton(R.string.dlg_ok, this)
212                     .setNegativeButton(R.string.dlg_cancel, this)
213                     .setCancelable(false)
214                     .show();
215         } else {
216             setLockToAppEnabled(false);
217             updateDisplay();
218         }
219     }
220 
221     @Override
onClick(DialogInterface dialogInterface, int which)222     public void onClick(DialogInterface dialogInterface, int which) {
223         if (which == DialogInterface.BUTTON_POSITIVE) {
224             setLockToAppEnabled(true);
225         } else {
226             mSwitchBar.setChecked(false);
227         }
228         updateDisplay();
229     }
230 
updateDisplay()231     private void updateDisplay() {
232         if (isLockToAppEnabled(getActivity())) {
233             mUseScreenLock.setEnabled(true);
234             mUseScreenLock.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
235                 @Override
236                 public boolean onPreferenceChange(Preference preference, Object newValue) {
237                     return setScreenLockUsed((boolean) newValue);
238                 }
239             });
240             mUseScreenLock.setChecked(isScreenLockUsed());
241             mUseScreenLock.setTitle(getCurrentSecurityTitle(mLockPatternUtils));
242         } else {
243             mUseScreenLock.setEnabled(false);
244         }
245         mFooterPreference.setSummary(getAppPinningContent());
246     }
247 
isGuestModeSupported()248     private boolean isGuestModeSupported() {
249         return UserManager.supportsMultipleUsers()
250                 && !mUserManager.hasUserRestriction(UserManager.DISALLOW_USER_SWITCH);
251     }
252 
getAppPinningContent()253     private CharSequence getAppPinningContent() {
254         final int stringResource = isGuestModeSupported()
255                 ? R.string.screen_pinning_guest_user_description
256                 : R.string.screen_pinning_description;
257         return MessageFormat.format(getActivity().getString(stringResource), 1, 2, 3);
258     }
259 
260     /**
261      * For search.
262      *
263      * This page only provides an index for the toggle preference of using screen lock for
264      * unpinning. The preference name will change with various lock configurations. Indexing data
265      * from XML isn't suitable since it uses a static title by default. So, we skip XML indexing
266      * by omitting the XML argument in the constructor and use a dynamic index method instead.
267      */
268     public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
269             new BaseSearchIndexProvider() {
270 
271                 @NonNull
272                 @Override
273                 public List<SearchIndexableRaw> getDynamicRawDataToIndex(@NonNull Context context,
274                         boolean enabled) {
275                     List<SearchIndexableRaw> dynamicRaws =
276                             super.getDynamicRawDataToIndex(context, enabled);
277                     final SearchIndexableRaw raw = new SearchIndexableRaw(context);
278                     final Resources res = context.getResources();
279                     final LockPatternUtils lockPatternUtils = new LockPatternUtils(context);
280                     raw.key = KEY_USE_SCREEN_LOCK;
281                     raw.title = res.getString(getCurrentSecurityTitle(lockPatternUtils));
282                     raw.screenTitle = res.getString(R.string.screen_pinning_title);
283                     dynamicRaws.add(raw);
284                     return dynamicRaws;
285                 }
286             };
287 }
288