Fix a status and navigation bar problem after viewing full-screen videos. https...
[PrivacyBrowser.git] / app / src / main / java / com / stoutner / privacybrowser / activities / MainWebViewActivity.java
1 /*
2  * Copyright © 2015-2018 Soren Stoutner <soren@stoutner.com>.
3  *
4  * Download cookie code contributed 2017 Hendrik Knackstedt.  Copyright assigned to Soren Stoutner <soren@stoutner.com>.
5  *
6  * This file is part of Privacy Browser <https://www.stoutner.com/privacy-browser>.
7  *
8  * Privacy Browser is free software: you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation, either version 3 of the License, or
11  * (at your option) any later version.
12  *
13  * Privacy Browser is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with Privacy Browser.  If not, see <http://www.gnu.org/licenses/>.
20  */
21
22 package com.stoutner.privacybrowser.activities;
23
24 import android.Manifest;
25 import android.annotation.SuppressLint;
26 import android.app.Activity;
27 import android.app.DialogFragment;
28 import android.app.DownloadManager;
29 import android.content.ActivityNotFoundException;
30 import android.content.BroadcastReceiver;
31 import android.content.ClipData;
32 import android.content.ClipboardManager;
33 import android.content.Context;
34 import android.content.Intent;
35 import android.content.IntentFilter;
36 import android.content.SharedPreferences;
37 import android.content.pm.PackageManager;
38 import android.content.res.Configuration;
39 import android.database.Cursor;
40 import android.graphics.Bitmap;
41 import android.graphics.BitmapFactory;
42 import android.graphics.Typeface;
43 import android.graphics.drawable.BitmapDrawable;
44 import android.graphics.drawable.Drawable;
45 import android.net.Uri;
46 import android.net.http.SslCertificate;
47 import android.net.http.SslError;
48 import android.os.Build;
49 import android.os.Bundle;
50 import android.os.Environment;
51 import android.os.Handler;
52 import android.preference.PreferenceManager;
53 import android.print.PrintDocumentAdapter;
54 import android.print.PrintManager;
55 import android.support.annotation.NonNull;
56 import android.support.design.widget.CoordinatorLayout;
57 import android.support.design.widget.FloatingActionButton;
58 import android.support.design.widget.NavigationView;
59 import android.support.design.widget.Snackbar;
60 import android.support.v4.app.ActivityCompat;
61 import android.support.v4.content.ContextCompat;
62 // `ShortcutInfoCompat`, `ShortcutManagerCompat`, and `IconCompat` can be switched to the non-compat version once API >= 26.
63 import android.support.v4.content.pm.ShortcutInfoCompat;
64 import android.support.v4.content.pm.ShortcutManagerCompat;
65 import android.support.v4.graphics.drawable.IconCompat;
66 import android.support.v4.view.GravityCompat;
67 import android.support.v4.widget.DrawerLayout;
68 import android.support.v4.widget.SwipeRefreshLayout;
69 import android.support.v7.app.ActionBar;
70 import android.support.v7.app.ActionBarDrawerToggle;
71 import android.support.v7.app.AppCompatActivity;
72 import android.support.v7.app.AppCompatDialogFragment;
73 import android.support.v7.widget.Toolbar;
74 import android.text.Editable;
75 import android.text.Spanned;
76 import android.text.TextWatcher;
77 import android.text.style.ForegroundColorSpan;
78 import android.util.Patterns;
79 import android.view.ContextMenu;
80 import android.view.GestureDetector;
81 import android.view.KeyEvent;
82 import android.view.Menu;
83 import android.view.MenuItem;
84 import android.view.MotionEvent;
85 import android.view.View;
86 import android.view.ViewGroup;
87 import android.view.WindowManager;
88 import android.view.inputmethod.InputMethodManager;
89 import android.webkit.CookieManager;
90 import android.webkit.HttpAuthHandler;
91 import android.webkit.SslErrorHandler;
92 import android.webkit.ValueCallback;
93 import android.webkit.WebBackForwardList;
94 import android.webkit.WebChromeClient;
95 import android.webkit.WebResourceResponse;
96 import android.webkit.WebStorage;
97 import android.webkit.WebView;
98 import android.webkit.WebViewClient;
99 import android.webkit.WebViewDatabase;
100 import android.widget.ArrayAdapter;
101 import android.widget.CursorAdapter;
102 import android.widget.EditText;
103 import android.widget.FrameLayout;
104 import android.widget.ImageView;
105 import android.widget.LinearLayout;
106 import android.widget.ListView;
107 import android.widget.ProgressBar;
108 import android.widget.RadioButton;
109 import android.widget.RelativeLayout;
110 import android.widget.TextView;
111
112 import com.stoutner.privacybrowser.BuildConfig;
113 import com.stoutner.privacybrowser.R;
114 import com.stoutner.privacybrowser.dialogs.AdConsentDialog;
115 import com.stoutner.privacybrowser.dialogs.CreateBookmarkDialog;
116 import com.stoutner.privacybrowser.dialogs.CreateBookmarkFolderDialog;
117 import com.stoutner.privacybrowser.dialogs.CreateHomeScreenShortcutDialog;
118 import com.stoutner.privacybrowser.dialogs.DownloadImageDialog;
119 import com.stoutner.privacybrowser.dialogs.DownloadLocationPermissionDialog;
120 import com.stoutner.privacybrowser.dialogs.EditBookmarkDialog;
121 import com.stoutner.privacybrowser.dialogs.EditBookmarkFolderDialog;
122 import com.stoutner.privacybrowser.dialogs.HttpAuthenticationDialog;
123 import com.stoutner.privacybrowser.dialogs.PinnedSslCertificateMismatchDialog;
124 import com.stoutner.privacybrowser.dialogs.UrlHistoryDialog;
125 import com.stoutner.privacybrowser.dialogs.ViewSslCertificateDialog;
126 import com.stoutner.privacybrowser.helpers.AdHelper;
127 import com.stoutner.privacybrowser.helpers.BlockListHelper;
128 import com.stoutner.privacybrowser.helpers.BookmarksDatabaseHelper;
129 import com.stoutner.privacybrowser.helpers.DomainsDatabaseHelper;
130 import com.stoutner.privacybrowser.helpers.OrbotProxyHelper;
131 import com.stoutner.privacybrowser.dialogs.DownloadFileDialog;
132 import com.stoutner.privacybrowser.dialogs.SslCertificateErrorDialog;
133
134 import java.io.ByteArrayInputStream;
135 import java.io.ByteArrayOutputStream;
136 import java.io.File;
137 import java.io.IOException;
138 import java.io.UnsupportedEncodingException;
139 import java.net.MalformedURLException;
140 import java.net.URL;
141 import java.net.URLDecoder;
142 import java.net.URLEncoder;
143 import java.util.ArrayList;
144 import java.util.Date;
145 import java.util.HashMap;
146 import java.util.HashSet;
147 import java.util.List;
148 import java.util.Map;
149 import java.util.Set;
150
151 // AppCompatActivity from android.support.v7.app.AppCompatActivity must be used to have access to the SupportActionBar until the minimum API is >= 21.
152 public class MainWebViewActivity extends AppCompatActivity implements CreateBookmarkDialog.CreateBookmarkListener, CreateBookmarkFolderDialog.CreateBookmarkFolderListener,
153         CreateHomeScreenShortcutDialog.CreateHomeScreenShortcutListener, DownloadFileDialog.DownloadFileListener, DownloadImageDialog.DownloadImageListener,
154         DownloadLocationPermissionDialog.DownloadLocationPermissionDialogListener, EditBookmarkDialog.EditBookmarkListener, EditBookmarkFolderDialog.EditBookmarkFolderListener,
155         HttpAuthenticationDialog.HttpAuthenticationListener, NavigationView.OnNavigationItemSelectedListener, PinnedSslCertificateMismatchDialog.PinnedSslCertificateMismatchListener,
156         SslCertificateErrorDialog.SslCertificateErrorListener, UrlHistoryDialog.UrlHistoryListener {
157
158     // `darkTheme` is public static so it can be accessed from everywhere.
159     public static boolean darkTheme;
160
161     // `allowScreenshots` is public static so it can be accessed from everywhere.  It is also used in `onCreate()`.
162     public static boolean allowScreenshots;
163
164     // `favoriteIconBitmap` is public static so it can be accessed from `CreateHomeScreenShortcutDialog`, `BookmarksActivity`, `BookmarksDatabaseViewActivity`, `CreateBookmarkDialog`,
165     // `CreateBookmarkFolderDialog`, `EditBookmarkDialog`, `EditBookmarkFolderDialog`, `EditBookmarkDatabaseViewDialog`, and `ViewSslCertificateDialog`.  It is also used in `onCreate()`,
166     // `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onCreateHomeScreenShortcutCreate()`, `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()`, and `applyDomainSettings()`.
167     public static Bitmap favoriteIconBitmap;
168
169     // `formattedUrlString` is public static so it can be accessed from `BookmarksActivity`, `CreateBookmarkDialog`, and `AddDomainDialog`.
170     // It is also used in `onCreate()`, `onOptionsItemSelected()`, `onNavigationItemSelected()`, `onCreateHomeScreenShortcutCreate()`, and `loadUrlFromTextBox()`.
171     public static String formattedUrlString;
172
173     // `sslCertificate` is public static so it can be accessed from `DomainsActivity`, `DomainsListFragment`, `DomainSettingsFragment`, `PinnedSslCertificateMismatchDialog`,
174     // and `ViewSslCertificateDialog`.  It is also used in `onCreate()`.
175     public static SslCertificate sslCertificate;
176
177     // `orbotStatus` is public static so it can be accessed from `OrbotProxyHelper`.  It is also used in `onCreate()` and `onResume()`.
178     public static String orbotStatus;
179
180     // `webViewTitle` is public static so it can be accessed from `CreateBookmarkDialog` and `CreateHomeScreenShortcutDialog`.  It is also used in `onCreate()`.
181     public static String webViewTitle;
182
183     // `appliedUserAgentString` is public static so it can be accessed from `ViewSourceActivity`.  It is also used in `applyDomainSettings()`.
184     public static String appliedUserAgentString;
185
186     // `reloadOnRestart` is public static so it can be accessed from `SettingsFragment`.  It is also used in `onRestart()`
187     public static boolean reloadOnRestart;
188
189     // `reloadUrlOnRestart` is public static so it can be accessed from `SettingsFragment` and `BookmarksActivity`.  It is also used in `onRestart()`.
190     public static boolean loadUrlOnRestart;
191
192     // `restartFromBookmarksActivity` is public static so it can be accessed from `BookmarksActivity`.  It is also used in `onRestart()`.
193     public static boolean restartFromBookmarksActivity;
194
195     // The block list versions are public static so they can be accessed from `AboutTabFragment`.  They are also used in `onCreate()`.
196     public static String easyListVersion;
197     public static String easyPrivacyVersion;
198     public static String fanboysAnnoyanceVersion;
199     public static String fanboysSocialVersion;
200     public static String ultraPrivacyVersion;
201
202     // The request items are public static so they can be accessed by `BlockListHelper`, `RequestsArrayAdapter`, and `ViewRequestsDialog`.  They are also used in `onCreate()` and `onPrepareOptionsMenu()`.
203     public static List<String[]> resourceRequests;
204     public static String[] whiteListResultStringArray;
205     int blockedRequests;
206     int easyListBlockedRequests;
207     int easyPrivacyBlockedRequests;
208     int fanboysAnnoyanceListBlockedRequests;
209     int fanboysSocialBlockingListBlockedRequests;
210     int ultraPrivacyBlockedRequests;
211     int thirdPartyBlockedRequests;
212
213     public final static int REQUEST_DISPOSITION = 0;
214     public final static int REQUEST_URL = 1;
215     public final static int REQUEST_BLOCKLIST = 2;
216     public final static int REQUEST_SUBLIST = 3;
217     public final static int REQUEST_BLOCKLIST_ENTRIES = 4;
218     public final static int REQUEST_BLOCKLIST_ORIGINAL_ENTRY = 5;
219
220     public final static int REQUEST_DEFAULT = 0;
221     public final static int REQUEST_ALLOWED = 1;
222     public final static int REQUEST_THIRD_PARTY = 2;
223     public final static int REQUEST_BLOCKED = 3;
224
225     public final static int MAIN_WHITELIST = 1;
226     public final static int FINAL_WHITELIST = 2;
227     public final static int DOMAIN_WHITELIST = 3;
228     public final static int DOMAIN_INITIAL_WHITELIST = 4;
229     public final static int DOMAIN_FINAL_WHITELIST = 5;
230     public final static int THIRD_PARTY_WHITELIST = 6;
231     public final static int THIRD_PARTY_DOMAIN_WHITELIST = 7;
232     public final static int THIRD_PARTY_DOMAIN_INITIAL_WHITELIST = 8;
233
234     public final static int MAIN_BLACKLIST = 9;
235     public final static int INITIAL_BLACKLIST = 10;
236     public final static int FINAL_BLACKLIST = 11;
237     public final static int DOMAIN_BLACKLIST = 12;
238     public final static int DOMAIN_INITIAL_BLACKLIST = 13;
239     public final static int DOMAIN_FINAL_BLACKLIST = 14;
240     public final static int DOMAIN_REGULAR_EXPRESSION_BLACKLIST = 15;
241     public final static int THIRD_PARTY_BLACKLIST = 16;
242     public final static int THIRD_PARTY_INITIAL_BLACKLIST = 17;
243     public final static int THIRD_PARTY_DOMAIN_BLACKLIST = 18;
244     public final static int THIRD_PARTY_DOMAIN_INITIAL_BLACKLIST = 19;
245     public final static int THIRD_PARTY_REGULAR_EXPRESSION_BLACKLIST = 20;
246     public final static int THIRD_PARTY_DOMAIN_REGULAR_EXPRESSION_BLACKLIST = 21;
247     public final static int REGULAR_EXPRESSION_BLACKLIST = 22;
248
249     // `blockAllThirdPartyRequests` is public static so it can be accessed from `RequestsActivity`.
250     // It is also used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, and `applyAppSettings()`
251     public static boolean blockAllThirdPartyRequests;
252
253     // `currentBookmarksFolder` is public static so it can be accessed from `BookmarksActivity`.  It is also used in `onCreate()`, `onBackPressed()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`,
254     // `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()`, and `loadBookmarksFolder()`.
255     public static String currentBookmarksFolder;
256
257     // `domainSettingsDatabaseId` is public static so it can be accessed from `PinnedSslCertificateMismatchDialog`.  It is also used in `onCreate()`, `onOptionsItemSelected()`, and `applyDomainSettings()`.
258     public static int domainSettingsDatabaseId;
259
260     // The pinned domain SSL Certificate variables are public static so they can be accessed from `PinnedSslCertificateMismatchDialog`.  They are also used in `onCreate()` and `applyDomainSettings()`.
261     public static String pinnedDomainSslIssuedToCNameString;
262     public static String pinnedDomainSslIssuedToONameString;
263     public static String pinnedDomainSslIssuedToUNameString;
264     public static String pinnedDomainSslIssuedByCNameString;
265     public static String pinnedDomainSslIssuedByONameString;
266     public static String pinnedDomainSslIssuedByUNameString;
267     public static Date pinnedDomainSslStartDate;
268     public static Date pinnedDomainSslEndDate;
269
270     // The user agent constants are public static so they can be accessed from `SettingsFragment`, `DomainsActivity`, and `DomainSettingsFragment`.
271     public final static int UNRECOGNIZED_USER_AGENT = -1;
272     public final static int SETTINGS_WEBVIEW_DEFAULT_USER_AGENT = 1;
273     public final static int SETTINGS_CUSTOM_USER_AGENT = 12;
274     public final static int DOMAINS_SYSTEM_DEFAULT_USER_AGENT = 0;
275     public final static int DOMAINS_WEBVIEW_DEFAULT_USER_AGENT = 2;
276     public final static int DOMAINS_CUSTOM_USER_AGENT = 13;
277
278
279     // `appBar` is used in `onCreate()`, `onOptionsItemSelected()`, `closeFindOnPage()`, and `applyAppSettings()`.
280     private ActionBar appBar;
281
282     // `navigatingHistory` is used in `onCreate()`, `onNavigationItemSelected()`, `onSslMismatchBack()`, and `applyDomainSettings()`.
283     private boolean navigatingHistory;
284
285     // `favoriteIconDefaultBitmap` is used in `onCreate()` and `applyDomainSettings`.
286     private Bitmap favoriteIconDefaultBitmap;
287
288     // `drawerLayout` is used in `onCreate()`, `onNewIntent()`, `onBackPressed()`, and `onRestart()`.
289     private DrawerLayout drawerLayout;
290
291     // `rootCoordinatorLayout` is used in `onCreate()` and `applyAppSettings()`.
292     private CoordinatorLayout rootCoordinatorLayout;
293
294     // `mainWebView` is used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, `onNavigationItemSelected()`, `onRestart()`, `onCreateContextMenu()`, `findPreviousOnPage()`,
295     // `findNextOnPage()`, `closeFindOnPage()`, `loadUrlFromTextBox()`, `onSslMismatchBack()`, and `setDisplayWebpageImages()`.
296     private WebView mainWebView;
297
298     // `fullScreenVideoFrameLayout` is used in `onCreate()` and `onConfigurationChanged()`.
299     private FrameLayout fullScreenVideoFrameLayout;
300
301     // `swipeRefreshLayout` is used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, and `onRestart()`.
302     private SwipeRefreshLayout swipeRefreshLayout;
303
304     // `urlAppBarRelativeLayout` is used in `onCreate()` and `applyDomainSettings()`.
305     private RelativeLayout urlAppBarRelativeLayout;
306
307     // `favoriteIconImageView` is used in `onCreate()` and `applyDomainSettings()`
308     private ImageView favoriteIconImageView;
309
310     // `cookieManager` is used in `onCreate()`, `onOptionsItemSelected()`, and `onNavigationItemSelected()`, `loadUrlFromTextBox()`, `onDownloadImage()`, `onDownloadFile()`, and `onRestart()`.
311     private CookieManager cookieManager;
312
313     // `customHeader` is used in `onCreate()`, `onOptionsItemSelected()`, `onCreateContextMenu()`, and `loadUrl()`.
314     private final Map<String, String> customHeaders = new HashMap<>();
315
316     // `javaScriptEnabled` is also used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, `applyDomainSettings()`, and `updatePrivacyIcons()`.
317     private boolean javaScriptEnabled;
318
319     // `firstPartyCookiesEnabled` is used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, `onDownloadImage()`, `onDownloadFile()`, and `applyDomainSettings()`.
320     private boolean firstPartyCookiesEnabled;
321
322     // `thirdPartyCookiesEnabled` used in `onCreate()`, `onPrepareOptionsMenu()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, and `applyDomainSettings()`.
323     private boolean thirdPartyCookiesEnabled;
324
325     // `domStorageEnabled` is used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, and `applyDomainSettings()`.
326     private boolean domStorageEnabled;
327
328     // `saveFormDataEnabled` is used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, and `applyDomainSettings()`.  It can be removed once the minimum API >= 26.
329     private boolean saveFormDataEnabled;
330
331     // `nightMode` is used in `onCreate()` and  `applyDomainSettings()`.
332     private boolean nightMode;
333
334     // `displayWebpageImagesBoolean` is used in `applyAppSettings()` and `applyDomainSettings()`.
335     private boolean displayWebpageImagesBoolean;
336
337     // 'homepage' is used in `onCreate()`, `onNavigationItemSelected()`, and `applyAppSettings()`.
338     private String homepage;
339
340     // `searchURL` is used in `loadURLFromTextBox()` and `applyAppSettings()`.
341     private String searchURL;
342
343     // `mainMenu` is used in `onCreateOptionsMenu()` and `updatePrivacyIcons()`.
344     private Menu mainMenu;
345
346     // `refreshMenuItem` is used in `onCreate()` and `onCreateOptionsMenu()`.
347     private MenuItem refreshMenuItem;
348
349     // The blocklist menu items are used in `onCreate()`, `onCreateOptionsMenu()`, and `onPrepareOptionsMenu()`.
350     private MenuItem blocklistsMenuItem;
351     private MenuItem easyListMenuItem;
352     private MenuItem easyPrivacyMenuItem;
353     private MenuItem fanboysAnnoyanceListMenuItem;
354     private MenuItem fanboysSocialBlockingListMenuItem;
355     private MenuItem ultraPrivacyMenuItem;
356     private MenuItem blockAllThirdParyRequestsMenuItem;
357
358     // The blocklist variables are used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, and `applyAppSettings()`.
359     private boolean easyListEnabled;
360     private boolean easyPrivacyEnabled;
361     private boolean fanboysAnnoyanceListEnabled;
362     private boolean fanboysSocialBlockingListEnabled;
363     private boolean ultraPrivacyEnabled;
364
365     // `privacyBrowserRuntime` is used in `onCreate()`, `onOptionsItemSelected()`, and `applyAppSettings()`.
366     private Runtime privacyBrowserRuntime;
367
368     // `proxyThroughOrbot` is used in `onRestart()` and `applyAppSettings()`.
369     private boolean proxyThroughOrbot;
370
371     // `incognitoModeEnabled` is used in `onCreate()` and `applyAppSettings()`.
372     private boolean incognitoModeEnabled;
373
374     // `fullScreenBrowsingModeEnabled` is used in `onCreate()` and `applyAppSettings()`.
375     private boolean fullScreenBrowsingModeEnabled;
376
377     // `inFullScreenBrowsingMode` is used in `onCreate()`, `onConfigurationChanged()`, and `applyAppSettings()`.
378     private boolean inFullScreenBrowsingMode;
379
380     // `hideSystemBarsOnFullscreen` is used in `onCreate()` and `applyAppSettings()`.
381     private boolean hideSystemBarsOnFullscreen;
382
383     // `translucentNavigationBarOnFullscreen` is used in `onCreate()` and `applyAppSettings()`.
384     private boolean translucentNavigationBarOnFullscreen;
385
386     // `reapplyDomainSettingsOnRestart` is used in `onCreate()`, `onOptionsItemSelected()`, `onNavigationItemSelected()`, `onRestart()`, and `onAddDomain()`, .
387     private boolean reapplyDomainSettingsOnRestart;
388
389     // `reapplyAppSettingsOnRestart` is used in `onNavigationItemSelected()` and `onRestart()`.
390     private boolean reapplyAppSettingsOnRestart;
391
392     // `displayingFullScreenVideo` is used in `onCreate()` and `onResume()`.
393     private boolean displayingFullScreenVideo;
394
395     // `currentDomainName` is used in `onCreate()`, `onOptionsItemSelected()`, `onNavigationItemSelected()`, `onAddDomain()`, and `applyDomainSettings()`.
396     private String currentDomainName;
397
398     // `ignorePinnedSslCertificateForDomain` is used in `onCreate()`, `onSslMismatchProceed()`, and `applyDomainSettings()`.
399     private boolean ignorePinnedSslCertificate;
400
401     // `orbotStatusBroadcastReciever` is used in `onCreate()` and `onDestroy()`.
402     private BroadcastReceiver orbotStatusBroadcastReceiver;
403
404     // `waitingForOrbot` is used in `onCreate()`, `onResume()`, and `applyAppSettings()`.
405     private boolean waitingForOrbot;
406
407     // `domainSettingsApplied` is used in `prepareOptionsMenu()`, `applyDomainSettings()`, and `setDisplayWebpageImages()`.
408     private boolean domainSettingsApplied;
409
410     // `displayWebpageImagesInt` is used in `applyDomainSettings()` and `setDisplayWebpageImages()`.
411     private int displayWebpageImagesInt;
412
413     // `onTheFlyDisplayImagesSet` is used in `applyDomainSettings()` and `setDisplayWebpageImages()`.
414     private boolean onTheFlyDisplayImagesSet;
415
416     // `waitingForOrbotData` is used in `onCreate()` and `applyAppSettings()`.
417     private String waitingForOrbotHTMLString;
418
419     // `privateDataDirectoryString` is used in `onCreate()`, `onOptionsItemSelected()`, and `onNavigationItemSelected()`.
420     private String privateDataDirectoryString;
421
422     // `findOnPageLinearLayout` is used in `onCreate()`, `onOptionsItemSelected()`, and `closeFindOnPage()`.
423     private LinearLayout findOnPageLinearLayout;
424
425     // `findOnPageEditText` is used in `onCreate()`, `onOptionsItemSelected()`, and `closeFindOnPage()`.
426     private EditText findOnPageEditText;
427
428     // `displayAdditionalAppBarIcons` is used in `onCreate()` and `onCreateOptionsMenu()`.
429     private boolean displayAdditionalAppBarIcons;
430
431     // `drawerToggle` is used in `onCreate()`, `onPostCreate()`, `onConfigurationChanged()`, `onNewIntent()`, and `onNavigationItemSelected()`.
432     private ActionBarDrawerToggle drawerToggle;
433
434     // `supportAppBar` is used in `onCreate()`, `onOptionsItemSelected()`, and `closeFindOnPage()`.
435     private Toolbar supportAppBar;
436
437     // `urlTextBox` is used in `onCreate()`, `onOptionsItemSelected()`, `loadUrlFromTextBox()`, `loadUrl()`, and `highlightUrlText()`.
438     private EditText urlTextBox;
439
440     // The color spans are used in `onCreate()` and `highlightUrlText()`.
441     private ForegroundColorSpan redColorSpan;
442     private ForegroundColorSpan initialGrayColorSpan;
443     private ForegroundColorSpan finalGrayColorSpan;
444
445     // `sslErrorHandler` is used in `onCreate()`, `onSslErrorCancel()`, and `onSslErrorProceed`.
446     private SslErrorHandler sslErrorHandler;
447
448     // `httpAuthHandler` is used in `onCreate()`, `onHttpAuthenticationCancel()`, and `onHttpAuthenticationProceed()`.
449     private static HttpAuthHandler httpAuthHandler;
450
451     // `inputMethodManager` is used in `onOptionsItemSelected()`, `loadUrlFromTextBox()`, and `closeFindOnPage()`.
452     private InputMethodManager inputMethodManager;
453
454     // `mainWebViewRelativeLayout` is used in `onCreate()` and `onNavigationItemSelected()`.
455     private RelativeLayout mainWebViewRelativeLayout;
456
457     // `urlIsLoading` is used in `onCreate()`, `onCreateOptionsMenu()`, `loadUrl()`, and `applyDomainSettings()`.
458     private boolean urlIsLoading;
459
460     // `pinnedDomainSslCertificate` is used in `onCreate()` and `applyDomainSettings()`.
461     private boolean pinnedDomainSslCertificate;
462
463     // `bookmarksDatabaseHelper` is used in `onCreate()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()`, and `loadBookmarksFolder()`.
464     private BookmarksDatabaseHelper bookmarksDatabaseHelper;
465
466     // `bookmarksListView` is used in `onCreate()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, and `loadBookmarksFolder()`.
467     private ListView bookmarksListView;
468
469     // `bookmarksTitleTextView` is used in `onCreate()` and `loadBookmarksFolder()`.
470     private TextView bookmarksTitleTextView;
471
472     // `bookmarksCursor` is used in `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()`, and `loadBookmarksFolder()`.
473     private Cursor bookmarksCursor;
474
475     // `bookmarksCursorAdapter` is used in `onCreateBookmark()`, `onCreateBookmarkFolder()` `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()`, and `loadBookmarksFolder()`.
476     private CursorAdapter bookmarksCursorAdapter;
477
478     // `oldFolderNameString` is used in `onCreate()` and `onSaveEditBookmarkFolder()`.
479     private String oldFolderNameString;
480
481     // `fileChooserCallback` is used in `onCreate()` and `onActivityResult()`.
482     private ValueCallback<Uri[]> fileChooserCallback;
483
484     // The download strings are used in `onCreate()` and `onRequestPermissionResult()`.
485     private String downloadUrl;
486     private String downloadContentDisposition;
487     private long downloadContentLength;
488
489     // `downloadImageUrl` is used in `onCreateContextMenu()` and `onRequestPermissionResult()`.
490     private String downloadImageUrl;
491
492     // The user agent variables are used in `onCreate()` and `applyDomainSettings()`.
493     private ArrayAdapter<CharSequence> userAgentNamesArray;
494     private String[] userAgentDataArray;
495
496     // The request codes are used in `onCreate()`, `onCreateContextMenu()`, `onCloseDownloadLocationPermissionDialog()`, and `onRequestPermissionResult()`.
497     private final int DOWNLOAD_FILE_REQUEST_CODE = 1;
498     private final int DOWNLOAD_IMAGE_REQUEST_CODE = 2;
499
500     @Override
501     // Remove Android Studio's warning about the dangers of using SetJavaScriptEnabled.  The whole premise of Privacy Browser is built around an understanding of these dangers.
502     // Also, remove the warning about needing to override `performClick()` when using an `OnTouchListener` with `WebView`.
503     @SuppressLint({"SetJavaScriptEnabled", "ClickableViewAccessibility"})
504     // Remove Android Studio's warning about deprecations.  We have to use the deprecated `getColor()` until API >= 23.
505     @SuppressWarnings("deprecation")
506     protected void onCreate(Bundle savedInstanceState) {
507         // Get a handle for the shared preferences.
508         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
509
510         // Get the theme and screenshot preferences.
511         darkTheme = sharedPreferences.getBoolean("dark_theme", false);
512         allowScreenshots = sharedPreferences.getBoolean("allow_screenshots", false);
513
514         // Disable screenshots if not allowed.
515         if (!allowScreenshots) {
516             getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
517         }
518
519         // Set the activity theme.
520         if (darkTheme) {
521             setTheme(R.style.PrivacyBrowserDark);
522         } else {
523             setTheme(R.style.PrivacyBrowserLight);
524         }
525
526         // Run the default commands.
527         super.onCreate(savedInstanceState);
528
529         // Set the content view.
530         setContentView(R.layout.main_drawerlayout);
531
532         // Get a handle for `inputMethodManager`.
533         inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
534
535         // `SupportActionBar` from `android.support.v7.app.ActionBar` must be used until the minimum API is >= 21.
536         supportAppBar = findViewById(R.id.app_bar);
537         setSupportActionBar(supportAppBar);
538         appBar = getSupportActionBar();
539
540         // This is needed to get rid of the Android Studio warning that `appBar` might be null.
541         assert appBar != null;
542
543         // Add the custom `url_app_bar` layout, which shows the favorite icon and the URL text bar.
544         appBar.setCustomView(R.layout.url_app_bar);
545         appBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
546
547         // Initialize the foreground color spans for highlighting the URLs.  We have to use the deprecated `getColor()` until API >= 23.
548         redColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.red_a700));
549         initialGrayColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.gray_500));
550         finalGrayColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.gray_500));
551
552         // Get a handle for `urlTextBox`.
553         urlTextBox = findViewById(R.id.url_edittext);
554
555         // Remove the formatting from `urlTextBar` when the user is editing the text.
556         urlTextBox.setOnFocusChangeListener((View v, boolean hasFocus) -> {
557             if (hasFocus) {  // The user is editing `urlTextBox`.
558                 // Remove the highlighting.
559                 urlTextBox.getText().removeSpan(redColorSpan);
560                 urlTextBox.getText().removeSpan(initialGrayColorSpan);
561                 urlTextBox.getText().removeSpan(finalGrayColorSpan);
562             } else {  // The user has stopped editing `urlTextBox`.
563                 // Reapply the highlighting.
564                 highlightUrlText();
565             }
566         });
567
568         // Set the go button on the keyboard to load the URL in `urlTextBox`.
569         urlTextBox.setOnKeyListener((View v, int keyCode, KeyEvent event) -> {
570             // If the event is a key-down event on the `enter` button, load the URL.
571             if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {
572                 // Load the URL into the mainWebView and consume the event.
573                 try {
574                     loadUrlFromTextBox();
575                 } catch (UnsupportedEncodingException e) {
576                     e.printStackTrace();
577                 }
578                 // If the enter key was pressed, consume the event.
579                 return true;
580             } else {
581                 // If any other key was pressed, do not consume the event.
582                 return false;
583             }
584         });
585
586         // Set `waitingForOrbotHTMLString`.
587         waitingForOrbotHTMLString = "<html><body><br/><center><h1>" + getString(R.string.waiting_for_orbot) + "</h1></center></body></html>";
588
589         // Initialize `currentDomainName`, `orbotStatus`, and `waitingForOrbot`.
590         currentDomainName = "";
591         orbotStatus = "unknown";
592         waitingForOrbot = false;
593
594         // Create an Orbot status `BroadcastReceiver`.
595         orbotStatusBroadcastReceiver = new BroadcastReceiver() {
596             @Override
597             public void onReceive(Context context, Intent intent) {
598                 // Store the content of the status message in `orbotStatus`.
599                 orbotStatus = intent.getStringExtra("org.torproject.android.intent.extra.STATUS");
600
601                 // If we are waiting on Orbot, load the website now that Orbot is connected.
602                 if (orbotStatus.equals("ON") && waitingForOrbot) {
603                     // Reset `waitingForOrbot`.
604                     waitingForOrbot = false;
605
606                     // Load `formattedUrlString
607                     loadUrl(formattedUrlString);
608                 }
609             }
610         };
611
612         // Register `orbotStatusBroadcastReceiver` on `this` context.
613         this.registerReceiver(orbotStatusBroadcastReceiver, new IntentFilter("org.torproject.android.intent.action.STATUS"));
614
615         // Get handles for views that need to be accessed.
616         drawerLayout = findViewById(R.id.drawerlayout);
617         rootCoordinatorLayout = findViewById(R.id.root_coordinatorlayout);
618         bookmarksListView = findViewById(R.id.bookmarks_drawer_listview);
619         bookmarksTitleTextView = findViewById(R.id.bookmarks_title_textview);
620         FloatingActionButton launchBookmarksActivityFab = findViewById(R.id.launch_bookmarks_activity_fab);
621         FloatingActionButton createBookmarkFolderFab = findViewById(R.id.create_bookmark_folder_fab);
622         FloatingActionButton createBookmarkFab = findViewById(R.id.create_bookmark_fab);
623         mainWebViewRelativeLayout = findViewById(R.id.main_webview_relativelayout);
624         mainWebView = findViewById(R.id.main_webview);
625         findOnPageLinearLayout = findViewById(R.id.find_on_page_linearlayout);
626         findOnPageEditText = findViewById(R.id.find_on_page_edittext);
627         fullScreenVideoFrameLayout = findViewById(R.id.full_screen_video_framelayout);
628         urlAppBarRelativeLayout = findViewById(R.id.url_app_bar_relativelayout);
629         favoriteIconImageView = findViewById(R.id.favorite_icon);
630
631         // Set the bookmarks drawer resources according to the theme.  This can't be done in the layout due to compatibility issues with the `DrawerLayout` support widget.
632         if (darkTheme) {
633             launchBookmarksActivityFab.setImageDrawable(getResources().getDrawable(R.drawable.bookmarks_dark));
634             createBookmarkFolderFab.setImageDrawable(getResources().getDrawable(R.drawable.create_folder_dark));
635             createBookmarkFab.setImageDrawable(getResources().getDrawable(R.drawable.create_bookmark_dark));
636             bookmarksListView.setBackgroundColor(getResources().getColor(R.color.gray_850));
637         } else {
638             launchBookmarksActivityFab.setImageDrawable(getResources().getDrawable(R.drawable.bookmarks_light));
639             createBookmarkFolderFab.setImageDrawable(getResources().getDrawable(R.drawable.create_folder_light));
640             createBookmarkFab.setImageDrawable(getResources().getDrawable(R.drawable.create_bookmark_light));
641             bookmarksListView.setBackgroundColor(getResources().getColor(R.color.white));
642         }
643
644         // Set the launch bookmarks activity FAB to launch the bookmarks activity.
645         launchBookmarksActivityFab.setOnClickListener(v -> {
646             // Create an intent to launch the bookmarks activity.
647             Intent bookmarksIntent = new Intent(getApplicationContext(), BookmarksActivity.class);
648
649             // Include the current folder with the `Intent`.
650             bookmarksIntent.putExtra("Current Folder", currentBookmarksFolder);
651
652             // Make it so.
653             startActivity(bookmarksIntent);
654         });
655
656         // Set the create new bookmark folder FAB to display an alert dialog.
657         createBookmarkFolderFab.setOnClickListener(v -> {
658             // Show the `CreateBookmarkFolderDialog` `AlertDialog` and name the instance `@string/create_folder`.
659             AppCompatDialogFragment createBookmarkFolderDialog = new CreateBookmarkFolderDialog();
660             createBookmarkFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.create_folder));
661         });
662
663         // Set the create new bookmark FAB to display an alert dialog.
664         createBookmarkFab.setOnClickListener(view -> {
665             // Show the `CreateBookmarkDialog` `AlertDialog` and name the instance `@string/create_bookmark`.
666             AppCompatDialogFragment createBookmarkDialog = new CreateBookmarkDialog();
667             createBookmarkDialog.show(getSupportFragmentManager(), getResources().getString(R.string.create_bookmark));
668         });
669
670         // Create a double-tap listener to toggle full-screen mode.
671         final GestureDetector gestureDetector = new GestureDetector(this, new GestureDetector.SimpleOnGestureListener() {
672             // Override `onDoubleTap()`.  All other events are handled using the default settings.
673             @Override
674             public boolean onDoubleTap(MotionEvent event) {
675                 if (fullScreenBrowsingModeEnabled) {  // Only process the double-tap if full screen browsing mode is enabled.
676                     // Toggle `inFullScreenBrowsingMode`.
677                     inFullScreenBrowsingMode = !inFullScreenBrowsingMode;
678
679                     if (inFullScreenBrowsingMode) {  // Switch to full screen mode.
680                         // Hide the `appBar`.
681                         appBar.hide();
682
683                         // Hide the banner ad in the free flavor.
684                         if (BuildConfig.FLAVOR.contentEquals("free")) {
685                             // The AdView is destroyed and recreated, which changes the ID, every time it is reloaded to handle possible rotations.
686                             AdHelper.hideAd(findViewById(R.id.adview));
687                         }
688
689                         // Modify the system bars.
690                         if (hideSystemBarsOnFullscreen) {  // Hide everything.
691                             // Remove the translucent overlays.
692                             getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
693
694                             // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
695                             drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
696
697                             /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
698                              * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
699                              * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
700                              */
701                             rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
702
703                             // Set `rootCoordinatorLayout` to fill the whole screen.
704                             rootCoordinatorLayout.setFitsSystemWindows(false);
705                         } else {  // Hide everything except the status and navigation bars.
706                             // Set `rootCoordinatorLayout` to fit under the status and navigation bars.
707                             rootCoordinatorLayout.setFitsSystemWindows(false);
708
709                             // There is an Android Support Library bug that causes a scrim to print on the right side of the `Drawer Layout` when the navigation bar is displayed on the right of the screen.
710                             if (translucentNavigationBarOnFullscreen) {
711                                 // Set the navigation bar to be translucent.
712                                 getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
713                             }
714                         }
715                     } else {  // Switch to normal viewing mode.
716                         // Show the `appBar`.
717                         appBar.show();
718
719                         // Show the `BannerAd` in the free flavor.
720                         if (BuildConfig.FLAVOR.contentEquals("free")) {
721                             // Reload the ad.  The AdView is destroyed and recreated, which changes the ID, every time it is reloaded to handle possible rotations.
722                             AdHelper.loadAd(findViewById(R.id.adview), getApplicationContext(), getString(R.string.ad_id));
723                         }
724
725                         // Remove the translucent navigation bar flag if it is set.
726                         getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
727
728                         // Add the translucent status flag if it is unset.  This also resets `drawerLayout's` `View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN`.
729                         getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
730
731                         // Remove any `SYSTEM_UI` flags from `rootCoordinatorLayout`.
732                         rootCoordinatorLayout.setSystemUiVisibility(0);
733
734                         // Constrain `rootCoordinatorLayout` inside the status and navigation bars.
735                         rootCoordinatorLayout.setFitsSystemWindows(true);
736                     }
737
738                     // Consume the double-tap.
739                     return true;
740                 } else { // Do not consume the double-tap because full screen browsing mode is disabled.
741                     return false;
742                 }
743             }
744         });
745
746         // Pass all touch events on `mainWebView` through `gestureDetector` to check for double-taps.
747         mainWebView.setOnTouchListener((View v, MotionEvent event) -> {
748             // Call `performClick()` on the view, which is required for accessibility.
749             v.performClick();
750
751             // Send the `event` to `gestureDetector`.
752             return gestureDetector.onTouchEvent(event);
753         });
754
755         // Update `findOnPageCountTextView`.
756         mainWebView.setFindListener(new WebView.FindListener() {
757             // Get a handle for `findOnPageCountTextView`.
758             final TextView findOnPageCountTextView = (TextView) findViewById(R.id.find_on_page_count_textview);
759
760             @Override
761             public void onFindResultReceived(int activeMatchOrdinal, int numberOfMatches, boolean isDoneCounting) {
762                 if ((isDoneCounting) && (numberOfMatches == 0)) {  // There are no matches.
763                     // Set `findOnPageCountTextView` to `0/0`.
764                     findOnPageCountTextView.setText(R.string.zero_of_zero);
765                 } else if (isDoneCounting) {  // There are matches.
766                     // `activeMatchOrdinal` is zero-based.
767                     int activeMatch = activeMatchOrdinal + 1;
768
769                     // Build the match string.
770                     String matchString = activeMatch + "/" + numberOfMatches;
771
772                     // Set `findOnPageCountTextView`.
773                     findOnPageCountTextView.setText(matchString);
774                 }
775             }
776         });
777
778         // Search for the string on the page whenever a character changes in the `findOnPageEditText`.
779         findOnPageEditText.addTextChangedListener(new TextWatcher() {
780             @Override
781             public void beforeTextChanged(CharSequence s, int start, int count, int after) {
782                 // Do nothing.
783             }
784
785             @Override
786             public void onTextChanged(CharSequence s, int start, int before, int count) {
787                 // Do nothing.
788             }
789
790             @Override
791             public void afterTextChanged(Editable s) {
792                 // Search for the text in `mainWebView`.
793                 mainWebView.findAllAsync(findOnPageEditText.getText().toString());
794             }
795         });
796
797         // Set the `check mark` button for the `findOnPageEditText` keyboard to close the soft keyboard.
798         findOnPageEditText.setOnKeyListener((v, keyCode, event) -> {
799             if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {  // The `enter` key was pressed.
800                 // Hide the soft keyboard.  `0` indicates no additional flags.
801                 inputMethodManager.hideSoftInputFromWindow(mainWebView.getWindowToken(), 0);
802
803                 // Consume the event.
804                 return true;
805             } else {  // A different key was pressed.
806                 // Do not consume the event.
807                 return false;
808             }
809         });
810
811         // Implement swipe to refresh
812         swipeRefreshLayout = findViewById(R.id.swipe_refreshlayout);
813         swipeRefreshLayout.setColorSchemeResources(R.color.blue_700);
814         swipeRefreshLayout.setOnRefreshListener(() -> mainWebView.reload());
815
816         // `DrawerTitle` identifies the `DrawerLayouts` in accessibility mode.
817         drawerLayout.setDrawerTitle(GravityCompat.START, getString(R.string.navigation_drawer));
818         drawerLayout.setDrawerTitle(GravityCompat.END, getString(R.string.bookmarks));
819
820         // Listen for touches on the navigation menu.
821         final NavigationView navigationView = findViewById(R.id.navigationview);
822         navigationView.setNavigationItemSelectedListener(this);
823
824         // Get handles for `navigationMenu` and the back and forward menu items.  The menu is zero-based, so items 1, 2, and 3 are the second, third, and fourth entries in the menu.
825         final Menu navigationMenu = navigationView.getMenu();
826         final MenuItem navigationBackMenuItem = navigationMenu.getItem(1);
827         final MenuItem navigationForwardMenuItem = navigationMenu.getItem(2);
828         final MenuItem navigationHistoryMenuItem = navigationMenu.getItem(3);
829         final MenuItem navigationRequestsMenuItem = navigationMenu.getItem(4);
830
831         // Initialize the bookmarks database helper.  `this` specifies the context.  The two `nulls` do not specify the database name or a `CursorFactory`.
832         // The `0` specifies a database version, but that is ignored and set instead using a constant in `BookmarksDatabaseHelper`.
833         bookmarksDatabaseHelper = new BookmarksDatabaseHelper(this, null, null, 0);
834
835         // Initialize `currentBookmarksFolder`.  `""` is the home folder in the database.
836         currentBookmarksFolder = "";
837
838         // Load the home folder, which is `""` in the database.
839         loadBookmarksFolder();
840
841         bookmarksListView.setOnItemClickListener((parent, view, position, id) -> {
842             // Convert the id from long to int to match the format of the bookmarks database.
843             int databaseID = (int) id;
844
845             // Get the bookmark cursor for this ID and move it to the first row.
846             Cursor bookmarkCursor = bookmarksDatabaseHelper.getBookmarkCursor(databaseID);
847             bookmarkCursor.moveToFirst();
848
849             // Act upon the bookmark according to the type.
850             if (bookmarkCursor.getInt(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1) {  // The selected bookmark is a folder.
851                 // Store the new folder name in `currentBookmarksFolder`.
852                 currentBookmarksFolder = bookmarkCursor.getString(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
853
854                 // Load the new folder.
855                 loadBookmarksFolder();
856             } else {  // The selected bookmark is not a folder.
857                 // Load the bookmark URL.
858                 loadUrl(bookmarkCursor.getString(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_URL)));
859
860                 // Close the bookmarks drawer.
861                 drawerLayout.closeDrawer(GravityCompat.END);
862             }
863
864             // Close the `Cursor`.
865             bookmarkCursor.close();
866         });
867
868         bookmarksListView.setOnItemLongClickListener((parent, view, position, id) -> {
869             // Convert the database ID from `long` to `int`.
870             int databaseId = (int) id;
871
872             // Find out if the selected bookmark is a folder.
873             boolean isFolder = bookmarksDatabaseHelper.isFolder(databaseId);
874
875             if (isFolder) {
876                 // Save the current folder name, which is used in `onSaveEditBookmarkFolder()`.
877                 oldFolderNameString = bookmarksCursor.getString(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
878
879                 // Show the edit bookmark folder `AlertDialog` and name the instance `@string/edit_folder`.
880                 AppCompatDialogFragment editFolderDialog = EditBookmarkFolderDialog.folderDatabaseId(databaseId);
881                 editFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_folder));
882             } else {
883                 // Show the edit bookmark `AlertDialog` and name the instance `@string/edit_bookmark`.
884                 AppCompatDialogFragment editBookmarkDialog = EditBookmarkDialog.bookmarkDatabaseId(databaseId);
885                 editBookmarkDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_bookmark));
886             }
887
888             // Consume the event.
889             return true;
890         });
891
892         // The drawer listener is used to update the navigation menu.
893         drawerLayout.addDrawerListener(new DrawerLayout.DrawerListener() {
894             @Override
895             public void onDrawerSlide(@NonNull View drawerView, float slideOffset) {
896             }
897
898             @Override
899             public void onDrawerOpened(@NonNull View drawerView) {
900             }
901
902             @Override
903             public void onDrawerClosed(@NonNull View drawerView) {
904             }
905
906             @Override
907             public void onDrawerStateChanged(int newState) {
908                 if ((newState == DrawerLayout.STATE_SETTLING) || (newState == DrawerLayout.STATE_DRAGGING)) {  // A drawer is opening or closing.
909                     // Update the back, forward, history, and requests menu items.
910                     navigationBackMenuItem.setEnabled(mainWebView.canGoBack());
911                     navigationForwardMenuItem.setEnabled(mainWebView.canGoForward());
912                     navigationHistoryMenuItem.setEnabled((mainWebView.canGoBack() || mainWebView.canGoForward()));
913                     navigationRequestsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
914
915                     // Hide the keyboard (if displayed).
916                     inputMethodManager.hideSoftInputFromWindow(mainWebView.getWindowToken(), 0);
917
918                     // Clear the focus from from the URL text box.
919                     urlTextBox.clearFocus();
920                 }
921             }
922         });
923
924         // drawerToggle creates the hamburger icon at the start of the AppBar.
925         drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, supportAppBar, R.string.open_navigation_drawer, R.string.close_navigation_drawer);
926
927         // Get a handle for the progress bar.
928         final ProgressBar progressBar = findViewById(R.id.progress_bar);
929
930         mainWebView.setWebChromeClient(new WebChromeClient() {
931             // Update the progress bar when a page is loading.
932             @Override
933             public void onProgressChanged(WebView view, int progress) {
934                 // Inject the night mode CSS if night mode is enabled.
935                 if (nightMode) {
936                     // `background-color: #212121` sets the background to be dark gray.  `color: #BDBDBD` sets the text color to be light gray.  `box-shadow: none` removes a lower underline on links
937                     // used by WordPress.  `text-decoration: none` removes all text underlines.  `text-shadow: none` removes text shadows, which usually have a hard coded color.
938                     // `border: none` removes all borders, which can also be used to underline text.
939                     // `a {color: #1565C0}` sets links to be a dark blue.  `!important` takes precedent over any existing sub-settings.
940                     mainWebView.evaluateJavascript("(function() {var parent = document.getElementsByTagName('head').item(0); var style = document.createElement('style'); style.type = 'text/css'; " +
941                             "style.innerHTML = '* {background-color: #212121 !important; color: #BDBDBD !important; box-shadow: none !important; text-decoration: none !important;" +
942                             "text-shadow: none !important; border: none !important;} a {color: #1565C0 !important;}'; parent.appendChild(style)})()", value -> {
943                                 // Initialize a `Handler` to display `mainWebView`.
944                                 Handler displayWebViewHandler = new Handler();
945
946                                 // Setup a `Runnable` to display `mainWebView` after a delay to allow the CSS to be applied.
947                                 Runnable displayWebViewRunnable = () -> {
948                                     // Only display `mainWebView` if the progress bar is one.  This prevents the display of the `WebView` while it is still loading.
949                                     if (progressBar.getVisibility() == View.GONE) {
950                                         mainWebView.setVisibility(View.VISIBLE);
951                                     }
952                                 };
953
954                                 // Use `displayWebViewHandler` to delay the displaying of `mainWebView` for 500 milliseconds.
955                                 displayWebViewHandler.postDelayed(displayWebViewRunnable, 500);
956                             });
957                 }
958
959                 // Update the progress bar.
960                 progressBar.setProgress(progress);
961
962                 // Set the visibility of the progress bar.
963                 if (progress < 100) {
964                     // Show the progress bar.
965                     progressBar.setVisibility(View.VISIBLE);
966                 } else {
967                     // Hide the progress bar.
968                     progressBar.setVisibility(View.GONE);
969
970                     // Display `mainWebView` if night mode is disabled.
971                     // Because of a race condition between `applyDomainSettings` and `onPageStarted`, when night mode is set by domain settings the `WebView` may be hidden even if night mode is not
972                     // currently enabled.
973                     if (!nightMode) {
974                         mainWebView.setVisibility(View.VISIBLE);
975                     }
976
977                     //Stop the swipe to refresh indicator if it is running
978                     swipeRefreshLayout.setRefreshing(false);
979                 }
980             }
981
982             // Set the favorite icon when it changes.
983             @Override
984             public void onReceivedIcon(WebView view, Bitmap icon) {
985                 // Only update the favorite icon if the website has finished loading.
986                 if (progressBar.getVisibility() == View.GONE) {
987                     // Save a copy of the favorite icon.
988                     favoriteIconBitmap = icon;
989
990                     // Place the favorite icon in the appBar.
991                     favoriteIconImageView.setImageBitmap(Bitmap.createScaledBitmap(icon, 64, 64, true));
992                 }
993             }
994
995             // Save a copy of the title when it changes.
996             @Override
997             public void onReceivedTitle(WebView view, String title) {
998                 // Save a copy of the title.
999                 webViewTitle = title;
1000             }
1001
1002             // Enter full screen video.
1003             @Override
1004             public void onShowCustomView(View view, CustomViewCallback callback) {
1005                 // Set the full screen video flag.
1006                 displayingFullScreenVideo = true;
1007
1008                 // Pause the ad if this is the free flavor.
1009                 if (BuildConfig.FLAVOR.contentEquals("free")) {
1010                     // The AdView is destroyed and recreated, which changes the ID, every time it is reloaded to handle possible rotations.
1011                     AdHelper.pauseAd(findViewById(R.id.adview));
1012                 }
1013
1014                 // Remove the translucent overlays.
1015                 getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
1016
1017                 // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
1018                 drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
1019
1020                 /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
1021                  * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
1022                  * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
1023                  */
1024                 rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
1025
1026                 // Set `rootCoordinatorLayout` to fill the entire screen.
1027                 rootCoordinatorLayout.setFitsSystemWindows(false);
1028
1029                 // Disable the sliding drawers.
1030                 drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
1031
1032                 // Add `view` to `fullScreenVideoFrameLayout` and display it on the screen.
1033                 fullScreenVideoFrameLayout.addView(view);
1034                 fullScreenVideoFrameLayout.setVisibility(View.VISIBLE);
1035             }
1036
1037             // Exit full screen video.
1038             @Override
1039             public void onHideCustomView() {
1040                 // Unset the full screen video flag.
1041                 displayingFullScreenVideo = false;
1042
1043                 // Hide `fullScreenVideoFrameLayout`.
1044                 fullScreenVideoFrameLayout.removeAllViews();
1045                 fullScreenVideoFrameLayout.setVisibility(View.GONE);
1046
1047                 // Enable the sliding drawers.
1048                 drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
1049
1050                 // Apply the appropriate full screen mode the `SYSTEM_UI` flags.
1051                 if (fullScreenBrowsingModeEnabled && inFullScreenBrowsingMode) {  // Privacy Browser is currently in full screen browsing mode.
1052                     if (hideSystemBarsOnFullscreen) {  // Hide everything.
1053                         // Remove the translucent navigation setting if it is currently flagged.
1054                         getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
1055
1056                         // Remove the translucent status bar overlay.
1057                         getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
1058
1059                         // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
1060                         drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
1061
1062                         /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
1063                          * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
1064                          * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
1065                          */
1066                         rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
1067                     } else {  // Hide everything except the status and navigation bars.
1068                         // Remove any `SYSTEM_UI` flags from `rootCoordinatorLayout`.
1069                         rootCoordinatorLayout.setSystemUiVisibility(0);
1070
1071                         // Add the translucent status flag if it is unset.
1072                         getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
1073
1074                         if (translucentNavigationBarOnFullscreen) {
1075                             // Set the navigation bar to be translucent.  This also resets `drawerLayout's` `View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN`.
1076                             getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
1077                         } else {
1078                             // Set the navigation bar to be black.
1079                             getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
1080                         }
1081                     }
1082                 } else {  // Switch to normal viewing mode.
1083                     // Show the `appBar` if `findOnPageLinearLayout` is not visible.
1084                     if (findOnPageLinearLayout.getVisibility() == View.GONE) {
1085                         appBar.show();
1086                     }
1087
1088                     // Show the `BannerAd` in the free flavor.
1089                     if (BuildConfig.FLAVOR.contentEquals("free")) {
1090                         // Initialize the ad.  The AdView is destroyed and recreated, which changes the ID, every time it is reloaded to handle possible rotations.
1091                         AdHelper.initializeAds(findViewById(R.id.adview), getApplicationContext(), getFragmentManager(), getString(R.string.ad_id));
1092                     }
1093
1094                     // Remove any `SYSTEM_UI` flags from `rootCoordinatorLayout`.
1095                     rootCoordinatorLayout.setSystemUiVisibility(0);
1096
1097                     // Remove the translucent navigation bar flag if it is set.
1098                     getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
1099
1100                     // Add the translucent status flag if it is unset.  This also resets `drawerLayout's` `View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN`.
1101                     getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
1102
1103                     // Constrain `rootCoordinatorLayout` inside the status and navigation bars.
1104                     rootCoordinatorLayout.setFitsSystemWindows(true);
1105                 }
1106
1107                 // Show the ad if this is the free flavor.
1108                 if (BuildConfig.FLAVOR.contentEquals("free")) {
1109                     // Reload the ad.  The AdView is destroyed and recreated, which changes the ID, every time it is reloaded to handle possible rotations.
1110                     AdHelper.loadAd(findViewById(R.id.adview), getApplicationContext(), getString(R.string.ad_id));
1111                 }
1112             }
1113
1114             // Upload files.
1115             @Override
1116             public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
1117                 // Show the file chooser if the device is running API >= 21.
1118                 if (Build.VERSION.SDK_INT >= 21) {
1119                     // Store the file path callback.
1120                     fileChooserCallback = filePathCallback;
1121
1122                     // Create an intent to open a chooser based ont the file chooser parameters.
1123                     Intent fileChooserIntent = fileChooserParams.createIntent();
1124
1125                     // Open the file chooser.  Currently only one `startActivityForResult` exists in this activity, so the request code, used to differentiate them, is simply `0`.
1126                     startActivityForResult(fileChooserIntent, 0);
1127                 }
1128                 return true;
1129             }
1130         });
1131
1132         // Register `mainWebView` for a context menu.  This is used to see link targets and download images.
1133         registerForContextMenu(mainWebView);
1134
1135         // Allow the downloading of files.
1136         mainWebView.setDownloadListener((String url, String userAgent, String contentDisposition, String mimetype, long contentLength) -> {
1137             // Check to see if the WRITE_EXTERNAL_STORAGE permission has already been granted.
1138             if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_DENIED) {
1139                 // The WRITE_EXTERNAL_STORAGE permission needs to be requested.
1140
1141                 // Store the variables for future use by `onRequestPermissionsResult()`.
1142                 downloadUrl = url;
1143                 downloadContentDisposition = contentDisposition;
1144                 downloadContentLength = contentLength;
1145
1146                 // Show a dialog if the user has previously denied the permission.
1147                 if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {  // Show a dialog explaining the request first.
1148                     // Get a handle for the download location permission alert dialog and set the download type to DOWNLOAD_FILE.
1149                     DialogFragment downloadLocationPermissionDialogFragment = DownloadLocationPermissionDialog.downloadType(DownloadLocationPermissionDialog.DOWNLOAD_FILE);
1150
1151                     // Show the download location permission alert dialog.  The permission will be requested when the the dialog is closed.
1152                     downloadLocationPermissionDialogFragment.show(getFragmentManager(), getString(R.string.download_location));
1153                 } else {  // Show the permission request directly.
1154                     // Request the permission.  The download dialog will be launched by `onRequestPermissionResult()`.
1155                     ActivityCompat.requestPermissions(this, new String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE}, DOWNLOAD_FILE_REQUEST_CODE);
1156                 }
1157             } else {  // The WRITE_EXTERNAL_STORAGE permission has already been granted.
1158                 // Get a handle for the download file alert dialog.
1159                 AppCompatDialogFragment downloadFileDialogFragment = DownloadFileDialog.fromUrl(url, contentDisposition, contentLength);
1160
1161                 // Show the download file alert dialog.
1162                 downloadFileDialogFragment.show(getSupportFragmentManager(), getString(R.string.download));
1163             }
1164         });
1165
1166         // Allow pinch to zoom.
1167         mainWebView.getSettings().setBuiltInZoomControls(true);
1168
1169         // Hide zoom controls.
1170         mainWebView.getSettings().setDisplayZoomControls(false);
1171
1172         // Set `mainWebView` to use a wide viewport.  Otherwise, some web pages will be scrunched and some content will render outside the screen.
1173         mainWebView.getSettings().setUseWideViewPort(true);
1174
1175         // Set `mainWebView` to load in overview mode (zoomed out to the maximum width).
1176         mainWebView.getSettings().setLoadWithOverviewMode(true);
1177
1178         // Explicitly disable geolocation.
1179         mainWebView.getSettings().setGeolocationEnabled(false);
1180
1181         // Initialize cookieManager.
1182         cookieManager = CookieManager.getInstance();
1183
1184         // Replace the header that `WebView` creates for `X-Requested-With` with a null value.  The default value is the application ID (com.stoutner.privacybrowser.standard).
1185         customHeaders.put("X-Requested-With", "");
1186
1187         // Initialize the default preference values the first time the program is run.  `false` keeps this command from resetting any current preferences back to default.
1188         PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
1189
1190         // Get the intent that started the app.
1191         final Intent launchingIntent = getIntent();
1192
1193         // Extract the launching intent data as `launchingIntentUriData`.
1194         final Uri launchingIntentUriData = launchingIntent.getData();
1195
1196         // Convert the launching intent URI data (if it exists) to a string and store it in `formattedUrlString`.
1197         if (launchingIntentUriData != null) {
1198             formattedUrlString = launchingIntentUriData.toString();
1199         }
1200
1201         // Get a handle for the `Runtime`.
1202         privacyBrowserRuntime = Runtime.getRuntime();
1203
1204         // Store the application's private data directory.
1205         privateDataDirectoryString = getApplicationInfo().dataDir;
1206         // `dataDir` will vary, but will be something like `/data/user/0/com.stoutner.privacybrowser.standard`, which links to `/data/data/com.stoutner.privacybrowser.standard`.
1207
1208         // Initialize `inFullScreenBrowsingMode`, which is always false at this point because Privacy Browser never starts in full screen browsing mode.
1209         inFullScreenBrowsingMode = false;
1210
1211         // Initialize the privacy settings variables.
1212         javaScriptEnabled = false;
1213         firstPartyCookiesEnabled = false;
1214         thirdPartyCookiesEnabled = false;
1215         domStorageEnabled = false;
1216         saveFormDataEnabled = false;  // Form data can be removed once the minimum API >= 26.
1217         nightMode = false;
1218
1219         // Initialize the WebView title.
1220         webViewTitle = getString(R.string.no_title);
1221
1222         // Initialize the favorite icon bitmap.  `ContextCompat` must be used until API >= 21.
1223         Drawable favoriteIconDrawable = ContextCompat.getDrawable(getApplicationContext(), R.drawable.world);
1224         BitmapDrawable favoriteIconBitmapDrawable = (BitmapDrawable) favoriteIconDrawable;
1225         assert favoriteIconBitmapDrawable != null;
1226         favoriteIconDefaultBitmap = favoriteIconBitmapDrawable.getBitmap();
1227
1228         // If the favorite icon is null, load the default.
1229         if (favoriteIconBitmap == null) {
1230             favoriteIconBitmap = favoriteIconDefaultBitmap;
1231         }
1232
1233         // Initialize the user agent array adapter and string array.
1234         userAgentNamesArray = ArrayAdapter.createFromResource(this, R.array.user_agent_names, R.layout.domain_settings_spinner_item);
1235         userAgentDataArray = getResources().getStringArray(R.array.user_agent_data);
1236
1237         // Apply the app settings from the shared preferences.
1238         applyAppSettings();
1239
1240         // Instantiate the block list helper.
1241         BlockListHelper blockListHelper = new BlockListHelper();
1242
1243         // Initialize the list of resource requests.
1244         resourceRequests = new ArrayList<>();
1245
1246         // Parse the block lists.
1247         final ArrayList<List<String[]>> easyList = blockListHelper.parseBlockList(getAssets(), "blocklists/easylist.txt");
1248         final ArrayList<List<String[]>> easyPrivacy = blockListHelper.parseBlockList(getAssets(), "blocklists/easyprivacy.txt");
1249         final ArrayList<List<String[]>> fanboysAnnoyanceList = blockListHelper.parseBlockList(getAssets(), "blocklists/fanboy-annoyance.txt");
1250         final ArrayList<List<String[]>> fanboysSocialList = blockListHelper.parseBlockList(getAssets(), "blocklists/fanboy-social.txt");
1251         final ArrayList<List<String[]>> ultraPrivacy = blockListHelper.parseBlockList(getAssets(), "blocklists/ultraprivacy.txt");
1252
1253         // Store the list versions.
1254         easyListVersion = easyList.get(0).get(0)[0];
1255         easyPrivacyVersion = easyPrivacy.get(0).get(0)[0];
1256         fanboysAnnoyanceVersion = fanboysAnnoyanceList.get(0).get(0)[0];
1257         fanboysSocialVersion = fanboysSocialList.get(0).get(0)[0];
1258         ultraPrivacyVersion = ultraPrivacy.get(0).get(0)[0];
1259
1260         // Get a handle for the activity.  This is used to update the requests counter while the navigation menu is open.
1261         Activity activity = this;
1262
1263         mainWebView.setWebViewClient(new WebViewClient() {
1264             // `shouldOverrideUrlLoading` makes this `WebView` the default handler for URLs inside the app, so that links are not kicked out to other apps.
1265             // The deprecated `shouldOverrideUrlLoading` must be used until API >= 24.
1266             @SuppressWarnings("deprecation")
1267             @Override
1268             public boolean shouldOverrideUrlLoading(WebView view, String url) {
1269                 if (url.startsWith("http")) {  // Load the URL in Privacy Browser.
1270                     // Reset the formatted URL string so the page will load correctly if blocking of third-party requests is enabled.
1271                     formattedUrlString = "";
1272
1273                     // Apply the domain settings for the new URL.  `applyDomainSettings` doesn't do anything if the domain has not changed.
1274                     applyDomainSettings(url, true, false);
1275
1276                     // Returning false causes the current WebView to handle the URL and prevents it from adding redirects to the history list.
1277                     return false;
1278                 } else if (url.startsWith("mailto:")) {  // Load the email address in an external email program.
1279                     // Use `ACTION_SENDTO` instead of `ACTION_SEND` so that only email programs are launched.
1280                     Intent emailIntent = new Intent(Intent.ACTION_SENDTO);
1281
1282                     // Parse the url and set it as the data for the intent.
1283                     emailIntent.setData(Uri.parse(url));
1284
1285                     // Open the email program in a new task instead of as part of Privacy Browser.
1286                     emailIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
1287
1288                     // Make it so.
1289                     startActivity(emailIntent);
1290
1291                     // Returning true indicates Privacy Browser is handling the URL by creating an intent.
1292                     return true;
1293                 } else if (url.startsWith("tel:")) {  // Load the phone number in the dialer.
1294                     // Open the dialer and load the phone number, but wait for the user to place the call.
1295                     Intent dialIntent = new Intent(Intent.ACTION_DIAL);
1296
1297                     // Add the phone number to the intent.
1298                     dialIntent.setData(Uri.parse(url));
1299
1300                     // Open the dialer in a new task instead of as part of Privacy Browser.
1301                     dialIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
1302
1303                     // Make it so.
1304                     startActivity(dialIntent);
1305
1306                     // Returning true indicates Privacy Browser is handling the URL by creating an intent.
1307                     return true;
1308                 } else {  // Load a system chooser to select an app that can handle the URL.
1309                     // Open an app that can handle the URL.
1310                     Intent genericIntent = new Intent(Intent.ACTION_VIEW);
1311
1312                     // Add the URL to the intent.
1313                     genericIntent.setData(Uri.parse(url));
1314
1315                     // List all apps that can handle the URL instead of just opening the first one.
1316                     genericIntent.addCategory(Intent.CATEGORY_BROWSABLE);
1317
1318                     // Open the app in a new task instead of as part of Privacy Browser.
1319                     genericIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
1320
1321                     // Start the app or display a snackbar if no app is available to handle the URL.
1322                     try {
1323                         startActivity(genericIntent);
1324                     } catch (ActivityNotFoundException exception) {
1325                         Snackbar.make(mainWebView, getString(R.string.unrecognized_url) + "  " + url, Snackbar.LENGTH_SHORT).show();
1326                     }
1327
1328                     // Returning true indicates Privacy Browser is handling the URL by creating an intent.
1329                     return true;
1330                 }
1331             }
1332
1333             // Check requests against the block lists.  The deprecated `shouldInterceptRequest()` must be used until minimum API >= 21.
1334             @SuppressWarnings("deprecation")
1335             @Override
1336             public WebResourceResponse shouldInterceptRequest(WebView view, String url){
1337                 // Create an empty web resource response to be used if the resource request is blocked.
1338                 WebResourceResponse emptyWebResourceResponse = new WebResourceResponse("text/plain", "utf8", new ByteArrayInputStream("".getBytes()));
1339
1340                 // Reset the whitelist results tracker.
1341                 whiteListResultStringArray = null;
1342
1343                 // Initialize the third party request tracker.
1344                 boolean isThirdPartyRequest = false;
1345
1346                 // Initialize the current domain string.
1347                 String currentDomain = "";
1348
1349                 // Nobody is happy when comparing null strings.
1350                 if (!(formattedUrlString == null) && !(url == null)) {
1351                     // Get the domain strings to URIs.
1352                     Uri currentDomainUri = Uri.parse(formattedUrlString);
1353                     Uri requestDomainUri = Uri.parse(url);
1354
1355                     // Get the domain host names.
1356                     String currentBaseDomain = currentDomainUri.getHost();
1357                     String requestBaseDomain = requestDomainUri.getHost();
1358
1359                     // Update the current domain variable.
1360                     currentDomain = currentBaseDomain;
1361
1362                     // Only compare the current base domain and the request base domain if neither is null.
1363                     if (!(currentBaseDomain == null) && !(requestBaseDomain == null)) {
1364                         // Determine the current base domain.
1365                         while (currentBaseDomain.indexOf(".", currentBaseDomain.indexOf(".") + 1) > 0) {  // There is at least one subdomain.
1366                             // Remove the first subdomain.
1367                             currentBaseDomain = currentBaseDomain.substring(currentBaseDomain.indexOf(".") + 1);
1368                         }
1369
1370                         // Determine the request base domain.
1371                         while (requestBaseDomain.indexOf(".", requestBaseDomain.indexOf(".") + 1) > 0) {  // There is at least one subdomain.
1372                             // Remove the first subdomain.
1373                             requestBaseDomain = requestBaseDomain.substring(requestBaseDomain.indexOf(".") + 1);
1374                         }
1375
1376                         // Update the third party request tracker.
1377                         isThirdPartyRequest = !currentBaseDomain.equals(requestBaseDomain);
1378                     }
1379                 }
1380
1381                 // Block third-party requests if enabled.
1382                 if (isThirdPartyRequest && blockAllThirdPartyRequests) {
1383                     // Increment the blocked requests counters.
1384                     blockedRequests++;
1385                     thirdPartyBlockedRequests++;
1386
1387                     // Update the titles of the blocklist menu items.  This must be run from the UI thread.
1388                     activity.runOnUiThread(() -> {
1389                         navigationRequestsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
1390                         blocklistsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
1391                         blockAllThirdParyRequestsMenuItem.setTitle(thirdPartyBlockedRequests + " - " + getString(R.string.block_all_third_party_requests));
1392                     });
1393
1394                     // Add the request to the log.
1395                     resourceRequests.add(new String[]{String.valueOf(REQUEST_THIRD_PARTY), url});
1396
1397                     // Return an empty web resource response.
1398                     return emptyWebResourceResponse;
1399                 }
1400
1401                 // Check UltraPrivacy if it is enabled.
1402                 if (ultraPrivacyEnabled) {
1403                     if (blockListHelper.isBlocked(currentDomain, url, isThirdPartyRequest, ultraPrivacy)) {
1404                         // Increment the blocked requests counters.
1405                         blockedRequests++;
1406                         ultraPrivacyBlockedRequests++;
1407
1408                         // Update the titles of the blocklist menu items.  This must be run from the UI thread.
1409                         activity.runOnUiThread(() -> {
1410                             navigationRequestsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
1411                             blocklistsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
1412                             ultraPrivacyMenuItem.setTitle(ultraPrivacyBlockedRequests + " - " + getString(R.string.ultraprivacy));
1413                         });
1414
1415                         // The resource request was blocked.  Return an empty web resource response.
1416                         return emptyWebResourceResponse;
1417                     }
1418
1419                     // If the whitelist result is not null, the request has been allowed by UltraPrivacy.
1420                     if (whiteListResultStringArray != null) {
1421                         // Add a whitelist entry to the resource requests array.
1422                         resourceRequests.add(whiteListResultStringArray);
1423
1424                         // The resource request has been allowed by UltraPrivacy.  `return null` loads the requested resource.
1425                         return null;
1426                     }
1427                 }
1428
1429                 // Check EasyList if it is enabled.
1430                 if (easyListEnabled) {
1431                     if (blockListHelper.isBlocked(currentDomain, url, isThirdPartyRequest, easyList)) {
1432                         // Increment the blocked requests counters.
1433                         blockedRequests++;
1434                         easyListBlockedRequests++;
1435
1436                         // Update the titles of the blocklist menu items.  This must be run from the UI thread.
1437                         activity.runOnUiThread(() -> {
1438                             navigationRequestsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
1439                             blocklistsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
1440                             easyListMenuItem.setTitle(easyListBlockedRequests + " - " + getString(R.string.easylist));
1441                         });
1442
1443                         // Reset the whitelist results tracker (because otherwise it will sometimes add results to the list due to a race condition).
1444                         whiteListResultStringArray = null;
1445
1446                         // The resource request was blocked.  Return an empty web resource response.
1447                         return emptyWebResourceResponse;
1448                     }
1449                 }
1450
1451                 // Check EasyPrivacy if it is enabled.
1452                 if (easyPrivacyEnabled) {
1453                     if (blockListHelper.isBlocked(currentDomain, url, isThirdPartyRequest, easyPrivacy)) {
1454                         // Increment the blocked requests counters.
1455                         blockedRequests++;
1456                         easyPrivacyBlockedRequests++;
1457
1458                         // Update the titles of the blocklist menu items.  This must be run from the UI thread.
1459                         activity.runOnUiThread(() -> {
1460                             navigationRequestsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
1461                             blocklistsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
1462                             easyPrivacyMenuItem.setTitle(easyPrivacyBlockedRequests + " - " + getString(R.string.easyprivacy));
1463                         });
1464
1465                         // Reset the whitelist results tracker (because otherwise it will sometimes add results to the list due to a race condition).
1466                         whiteListResultStringArray = null;
1467
1468                         // The resource request was blocked.  Return an empty web resource response.
1469                         return emptyWebResourceResponse;
1470                     }
1471                 }
1472
1473                 // Check Fanboy’s Annoyance List if it is enabled.
1474                 if (fanboysAnnoyanceListEnabled) {
1475                     if (blockListHelper.isBlocked(currentDomain, url, isThirdPartyRequest, fanboysAnnoyanceList)) {
1476                         // Increment the blocked requests counters.
1477                         blockedRequests++;
1478                         fanboysAnnoyanceListBlockedRequests++;
1479
1480                         // Update the titles of the blocklist menu items.  This must be run from the UI thread.
1481                         activity.runOnUiThread(() -> {
1482                             navigationRequestsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
1483                             blocklistsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
1484                             fanboysAnnoyanceListMenuItem.setTitle(fanboysAnnoyanceListBlockedRequests + " - " + getString(R.string.fanboys_annoyance_list));
1485                         });
1486
1487                         // Reset the whitelist results tracker (because otherwise it will sometimes add results to the list due to a race condition).
1488                         whiteListResultStringArray = null;
1489
1490                         // The resource request was blocked.  Return an empty web resource response.
1491                         return emptyWebResourceResponse;
1492                     }
1493                 } else if (fanboysSocialBlockingListEnabled){  // Only check Fanboy’s Social Blocking List if Fanboy’s Annoyance List is disabled.
1494                     if (blockListHelper.isBlocked(currentDomain, url, isThirdPartyRequest, fanboysSocialList)) {
1495                         // Increment the blocked requests counters.
1496                         blockedRequests++;
1497                         fanboysSocialBlockingListBlockedRequests++;
1498
1499                         // Update the titles of the blocklist menu items.  This must be run from the UI thread.
1500                         activity.runOnUiThread(() -> {
1501                             navigationRequestsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
1502                             blocklistsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
1503                             fanboysSocialBlockingListMenuItem.setTitle(fanboysSocialBlockingListBlockedRequests + " - " + getString(R.string.fanboys_social_blocking_list));
1504                         });
1505
1506                         // Reset the whitelist results tracker (because otherwise it will sometimes add results to the list due to a race condition).
1507                         whiteListResultStringArray = null;
1508
1509                         // The resource request was blocked.  Return an empty web resource response.
1510                         return emptyWebResourceResponse;
1511                     }
1512                 }
1513
1514                 // Add the request to the log because it hasn't been processed by any of the previous checks.
1515                 if (whiteListResultStringArray != null ) {  // The request was processed by a whitelist.
1516                     resourceRequests.add(whiteListResultStringArray);
1517                 } else {  // The request didn't match any blocklist entry.  Log it as a defult request.
1518                     resourceRequests.add(new String[]{String.valueOf(REQUEST_DEFAULT), url});
1519                 }
1520
1521                 // The resource request has not been blocked.  `return null` loads the requested resource.
1522                 return null;
1523             }
1524
1525             // Handle HTTP authentication requests.
1526             @Override
1527             public void onReceivedHttpAuthRequest(WebView view, HttpAuthHandler handler, String host, String realm) {
1528                 // Store `handler` so it can be accessed from `onHttpAuthenticationCancel()` and `onHttpAuthenticationProceed()`.
1529                 httpAuthHandler = handler;
1530
1531                 // Display the HTTP authentication dialog.
1532                 AppCompatDialogFragment httpAuthenticationDialogFragment = HttpAuthenticationDialog.displayDialog(host, realm);
1533                 httpAuthenticationDialogFragment.show(getSupportFragmentManager(), getString(R.string.http_authentication));
1534             }
1535
1536             // Update the URL in urlTextBox when the page starts to load.
1537             @Override
1538             public void onPageStarted(WebView view, String url, Bitmap favicon) {
1539                 // Reset the list of resource requests.
1540                 resourceRequests.clear();
1541
1542                 // Initialize the counters for requests blocked by each blocklist.
1543                 blockedRequests = 0;
1544                 easyListBlockedRequests = 0;
1545                 easyPrivacyBlockedRequests = 0;
1546                 fanboysAnnoyanceListBlockedRequests = 0;
1547                 fanboysSocialBlockingListBlockedRequests = 0;
1548                 ultraPrivacyBlockedRequests = 0;
1549                 thirdPartyBlockedRequests = 0;
1550
1551                 // If night mode is enabled, hide `mainWebView` until after the night mode CSS is applied.
1552                 if (nightMode) {
1553                     mainWebView.setVisibility(View.INVISIBLE);
1554                 }
1555
1556                 // Hide the keyboard.  `0` indicates no additional flags.
1557                 inputMethodManager.hideSoftInputFromWindow(mainWebView.getWindowToken(), 0);
1558
1559                 // Check to see if Privacy Browser is waiting on Orbot.
1560                 if (!waitingForOrbot) {  // We are not waiting on Orbot, so we need to process the URL.
1561                     // We need to update `formattedUrlString` at the beginning of the load, so that if the user toggles JavaScript during the load the new website is reloaded.
1562                     formattedUrlString = url;
1563
1564                     // Display the formatted URL text.
1565                     urlTextBox.setText(formattedUrlString);
1566
1567                     // Apply text highlighting to `urlTextBox`.
1568                     highlightUrlText();
1569
1570                     // Apply any custom domain settings if the URL was loaded by navigating history.
1571                     if (navigatingHistory) {
1572                         // Reset `navigatingHistory`.
1573                         navigatingHistory = false;
1574
1575                         // Apply the domain settings.
1576                         applyDomainSettings(url, true, false);
1577                     }
1578
1579                     // Set `urlIsLoading` to `true`, so that redirects while loading do not trigger changes in the user agent, which forces another reload of the existing page.
1580                     urlIsLoading = true;
1581
1582                     // Replace Refresh with Stop if the menu item has been created.  (The WebView typically begins loading before the menu items are instantiated.)
1583                     if (refreshMenuItem != null) {
1584                         // Set the title.
1585                         refreshMenuItem.setTitle(R.string.stop);
1586
1587                         // If the icon is displayed in the AppBar, set it according to the theme.
1588                         if (displayAdditionalAppBarIcons) {
1589                             if (darkTheme) {
1590                                 refreshMenuItem.setIcon(R.drawable.close_dark);
1591                             } else {
1592                                 refreshMenuItem.setIcon(R.drawable.close_light);
1593                             }
1594                         }
1595                     }
1596                 }
1597             }
1598
1599             // It is necessary to update `formattedUrlString` and `urlTextBox` after the page finishes loading because the final URL can change during load.
1600             @Override
1601             public void onPageFinished(WebView view, String url) {
1602                 // Flush any cookies to persistent storage.  `CookieManager` has become very lazy about flushing cookies in recent versions.
1603                 if (firstPartyCookiesEnabled && Build.VERSION.SDK_INT >= 21) {
1604                     cookieManager.flush();
1605                 }
1606
1607                 // Update the Refresh menu item if it has been created.
1608                 if (refreshMenuItem != null) {
1609                     // Reset the Refresh title.
1610                     refreshMenuItem.setTitle(R.string.refresh);
1611
1612                     // If the icon is displayed in the AppBar, reset it according to the theme.
1613                     if (displayAdditionalAppBarIcons) {
1614                         if (darkTheme) {
1615                             refreshMenuItem.setIcon(R.drawable.refresh_enabled_dark);
1616                         } else {
1617                             refreshMenuItem.setIcon(R.drawable.refresh_enabled_light);
1618                         }
1619                     }
1620                 }
1621
1622                 // Reset `urlIsLoading`, which is used to prevent reloads on redirect if the user agent changes.
1623                 urlIsLoading = false;
1624
1625                 // Clear the cache and history if Incognito Mode is enabled.
1626                 if (incognitoModeEnabled) {
1627                     // Clear the cache.  `true` includes disk files.
1628                     mainWebView.clearCache(true);
1629
1630                     // Clear the back/forward history.
1631                     mainWebView.clearHistory();
1632
1633                     // Manually delete cache folders.
1634                     try {
1635                         // Delete the main cache directory.
1636                         privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/cache");
1637
1638                         // Delete the secondary `Service Worker` cache directory.
1639                         // A `String[]` must be used because the directory contains a space and `Runtime.exec` will not escape the string correctly otherwise.
1640                         privacyBrowserRuntime.exec(new String[] {"rm", "-rf", privateDataDirectoryString + "/app_webview/Service Worker/"});
1641                     } catch (IOException e) {
1642                         // Do nothing if an error is thrown.
1643                     }
1644                 }
1645
1646                 // Update `urlTextBox` and apply domain settings if not waiting on Orbot.
1647                 if (!waitingForOrbot) {
1648                     // Check to see if `WebView` has set `url` to be `about:blank`.
1649                     if (url.equals("about:blank")) {  // `WebView` is blank, so `formattedUrlString` should be `""` and `urlTextBox` should display a hint.
1650                         // Set `formattedUrlString` to `""`.
1651                         formattedUrlString = "";
1652
1653                         urlTextBox.setText(formattedUrlString);
1654
1655                         // Request focus for `urlTextBox`.
1656                         urlTextBox.requestFocus();
1657
1658                         // Display the keyboard.
1659                         inputMethodManager.showSoftInput(urlTextBox, 0);
1660
1661                         // Apply the domain settings.  This clears any settings from the previous domain.
1662                         applyDomainSettings(formattedUrlString, true, false);
1663                     } else {  // `WebView` has loaded a webpage.
1664                         // Set `formattedUrlString`.
1665                         formattedUrlString = url;
1666
1667                         // Only update `urlTextBox` if the user is not typing in it.
1668                         if (!urlTextBox.hasFocus()) {
1669                             // Display the formatted URL text.
1670                             urlTextBox.setText(formattedUrlString);
1671
1672                             // Apply text highlighting to `urlTextBox`.
1673                             highlightUrlText();
1674                         }
1675                     }
1676
1677                     // Store the SSL certificate so it can be accessed from `ViewSslCertificateDialog` and `PinnedSslCertificateMismatchDialog`.
1678                     sslCertificate = mainWebView.getCertificate();
1679
1680                     // Check the current website SSL certificate against the pinned SSL certificate if there is a pinned SSL certificate the user has not chosen to ignore it for this session.
1681                     if (pinnedDomainSslCertificate && !ignorePinnedSslCertificate) {
1682                         // Initialize the current SSL certificate variables.
1683                         String currentWebsiteIssuedToCName = "";
1684                         String currentWebsiteIssuedToOName = "";
1685                         String currentWebsiteIssuedToUName = "";
1686                         String currentWebsiteIssuedByCName = "";
1687                         String currentWebsiteIssuedByOName = "";
1688                         String currentWebsiteIssuedByUName = "";
1689                         Date currentWebsiteSslStartDate = null;
1690                         Date currentWebsiteSslEndDate = null;
1691
1692
1693                         // Extract the individual pieces of information from the current website SSL certificate if it is not null.
1694                         if (sslCertificate != null) {
1695                             currentWebsiteIssuedToCName = sslCertificate.getIssuedTo().getCName();
1696                             currentWebsiteIssuedToOName = sslCertificate.getIssuedTo().getOName();
1697                             currentWebsiteIssuedToUName = sslCertificate.getIssuedTo().getUName();
1698                             currentWebsiteIssuedByCName = sslCertificate.getIssuedBy().getCName();
1699                             currentWebsiteIssuedByOName = sslCertificate.getIssuedBy().getOName();
1700                             currentWebsiteIssuedByUName = sslCertificate.getIssuedBy().getUName();
1701                             currentWebsiteSslStartDate = sslCertificate.getValidNotBeforeDate();
1702                             currentWebsiteSslEndDate = sslCertificate.getValidNotAfterDate();
1703                         }
1704
1705                         // Initialize `String` variables to store the SSL certificate dates.  `Strings` are needed to compare the values below, which doesn't work with `Dates` if they are `null`.
1706                         String currentWebsiteSslStartDateString = "";
1707                         String currentWebsiteSslEndDateString = "";
1708                         String pinnedDomainSslStartDateString = "";
1709                         String pinnedDomainSslEndDateString = "";
1710
1711                         // Convert the `Dates` to `Strings` if they are not `null`.
1712                         if (currentWebsiteSslStartDate != null) {
1713                             currentWebsiteSslStartDateString = currentWebsiteSslStartDate.toString();
1714                         }
1715
1716                         if (currentWebsiteSslEndDate != null) {
1717                             currentWebsiteSslEndDateString = currentWebsiteSslEndDate.toString();
1718                         }
1719
1720                         if (pinnedDomainSslStartDate != null) {
1721                             pinnedDomainSslStartDateString = pinnedDomainSslStartDate.toString();
1722                         }
1723
1724                         if (pinnedDomainSslEndDate != null) {
1725                             pinnedDomainSslEndDateString = pinnedDomainSslEndDate.toString();
1726                         }
1727
1728                         // Check to see if the pinned SSL certificate matches the current website certificate.
1729                         if (!currentWebsiteIssuedToCName.equals(pinnedDomainSslIssuedToCNameString) || !currentWebsiteIssuedToOName.equals(pinnedDomainSslIssuedToONameString) ||
1730                                 !currentWebsiteIssuedToUName.equals(pinnedDomainSslIssuedToUNameString) || !currentWebsiteIssuedByCName.equals(pinnedDomainSslIssuedByCNameString) ||
1731                                 !currentWebsiteIssuedByOName.equals(pinnedDomainSslIssuedByONameString) || !currentWebsiteIssuedByUName.equals(pinnedDomainSslIssuedByUNameString) ||
1732                                 !currentWebsiteSslStartDateString.equals(pinnedDomainSslStartDateString) || !currentWebsiteSslEndDateString.equals(pinnedDomainSslEndDateString)) {
1733                             // The pinned SSL certificate doesn't match the current domain certificate.
1734                             //Display the pinned SSL certificate mismatch `AlertDialog`.
1735                             AppCompatDialogFragment pinnedSslCertificateMismatchDialogFragment = new PinnedSslCertificateMismatchDialog();
1736                             pinnedSslCertificateMismatchDialogFragment.show(getSupportFragmentManager(), getString(R.string.ssl_certificate_mismatch));
1737                         }
1738                     }
1739                 }
1740             }
1741
1742             // Handle SSL Certificate errors.
1743             @Override
1744             public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
1745                 // Get the current website SSL certificate.
1746                 SslCertificate currentWebsiteSslCertificate = error.getCertificate();
1747
1748                 // Extract the individual pieces of information from the current website SSL certificate.
1749                 String currentWebsiteIssuedToCName = currentWebsiteSslCertificate.getIssuedTo().getCName();
1750                 String currentWebsiteIssuedToOName = currentWebsiteSslCertificate.getIssuedTo().getOName();
1751                 String currentWebsiteIssuedToUName = currentWebsiteSslCertificate.getIssuedTo().getUName();
1752                 String currentWebsiteIssuedByCName = currentWebsiteSslCertificate.getIssuedBy().getCName();
1753                 String currentWebsiteIssuedByOName = currentWebsiteSslCertificate.getIssuedBy().getOName();
1754                 String currentWebsiteIssuedByUName = currentWebsiteSslCertificate.getIssuedBy().getUName();
1755                 Date currentWebsiteSslStartDate = currentWebsiteSslCertificate.getValidNotBeforeDate();
1756                 Date currentWebsiteSslEndDate = currentWebsiteSslCertificate.getValidNotAfterDate();
1757
1758                 // Proceed to the website if the current SSL website certificate matches the pinned domain certificate.
1759                 if (pinnedDomainSslCertificate &&
1760                         currentWebsiteIssuedToCName.equals(pinnedDomainSslIssuedToCNameString) && currentWebsiteIssuedToOName.equals(pinnedDomainSslIssuedToONameString) &&
1761                         currentWebsiteIssuedToUName.equals(pinnedDomainSslIssuedToUNameString) && currentWebsiteIssuedByCName.equals(pinnedDomainSslIssuedByCNameString) &&
1762                         currentWebsiteIssuedByOName.equals(pinnedDomainSslIssuedByONameString) && currentWebsiteIssuedByUName.equals(pinnedDomainSslIssuedByUNameString) &&
1763                         currentWebsiteSslStartDate.equals(pinnedDomainSslStartDate) && currentWebsiteSslEndDate.equals(pinnedDomainSslEndDate)) {
1764                     // An SSL certificate is pinned and matches the current domain certificate.
1765                     // Proceed to the website without displaying an error.
1766                     handler.proceed();
1767                 } else {  // Either there isn't a pinned SSL certificate or it doesn't match the current website certificate.
1768                     // Store `handler` so it can be accesses from `onSslErrorCancel()` and `onSslErrorProceed()`.
1769                     sslErrorHandler = handler;
1770
1771                     // Display the SSL error `AlertDialog`.
1772                     AppCompatDialogFragment sslCertificateErrorDialogFragment = SslCertificateErrorDialog.displayDialog(error);
1773                     sslCertificateErrorDialogFragment.show(getSupportFragmentManager(), getString(R.string.ssl_certificate_error));
1774                 }
1775             }
1776         });
1777
1778         // Load the website if not waiting for Orbot to connect.
1779         if (!waitingForOrbot) {
1780             loadUrl(formattedUrlString);
1781         }
1782     }
1783
1784     @Override
1785     protected void onNewIntent(Intent intent) {
1786         // Sets the new intent as the activity intent, so that any future `getIntent()`s pick up this one instead of creating a new activity.
1787         setIntent(intent);
1788
1789         // Check to see if the intent contains a new URL.
1790         if (intent.getData() != null) {
1791             // Get the intent data.
1792             final Uri intentUriData = intent.getData();
1793
1794             // Load the website.
1795             loadUrl(intentUriData.toString());
1796
1797             // Close the navigation drawer if it is open.
1798             if (drawerLayout.isDrawerVisible(GravityCompat.START)) {
1799                 drawerLayout.closeDrawer(GravityCompat.START);
1800             }
1801
1802             // Close the bookmarks drawer if it is open.
1803             if (drawerLayout.isDrawerVisible(GravityCompat.END)) {
1804                 drawerLayout.closeDrawer(GravityCompat.END);
1805             }
1806
1807             // Clear the keyboard if displayed and remove the focus on the urlTextBar if it has it.
1808             mainWebView.requestFocus();
1809         }
1810     }
1811
1812     @Override
1813     public void onRestart() {
1814         // Run the default commands.
1815         super.onRestart();
1816
1817         // Make sure Orbot is running if Privacy Browser is proxying through Orbot.
1818         if (proxyThroughOrbot) {
1819             // Request Orbot to start.  If Orbot is already running no hard will be caused by this request.
1820             Intent orbotIntent = new Intent("org.torproject.android.intent.action.START");
1821
1822             // Send the intent to the Orbot package.
1823             orbotIntent.setPackage("org.torproject.android");
1824
1825             // Make it so.
1826             sendBroadcast(orbotIntent);
1827         }
1828
1829         // Apply the app settings if returning from the Settings activity..
1830         if (reapplyAppSettingsOnRestart) {
1831             // Apply the app settings.
1832             applyAppSettings();
1833
1834             // Reload the webpage if displaying of images has been disabled in the Settings activity.
1835             if (reloadOnRestart) {
1836                 // Reload `mainWebView`.
1837                 mainWebView.reload();
1838
1839                 // Reset `reloadOnRestartBoolean`.
1840                 reloadOnRestart = false;
1841             }
1842
1843             // Reset the return from settings flag.
1844             reapplyAppSettingsOnRestart = false;
1845         }
1846
1847         // Apply the domain settings if returning from the Domains activity.
1848         if (reapplyDomainSettingsOnRestart) {
1849             // Reapply the domain settings.
1850             applyDomainSettings(formattedUrlString, false, true);
1851
1852             // Reset `reapplyDomainSettingsOnRestart`.
1853             reapplyDomainSettingsOnRestart = false;
1854         }
1855
1856         // Load the URL on restart to apply changes to night mode.
1857         if (loadUrlOnRestart) {
1858             // Load the current `formattedUrlString`.
1859             loadUrl(formattedUrlString);
1860
1861             // Reset `loadUrlOnRestart.
1862             loadUrlOnRestart = false;
1863         }
1864
1865         // Update the bookmarks drawer if returning from the Bookmarks activity.
1866         if (restartFromBookmarksActivity) {
1867             // Close the bookmarks drawer.
1868             drawerLayout.closeDrawer(GravityCompat.END);
1869
1870             // Reload the bookmarks drawer.
1871             loadBookmarksFolder();
1872
1873             // Reset `restartFromBookmarksActivity`.
1874             restartFromBookmarksActivity = false;
1875         }
1876
1877         // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.  This can be important if the screen was rotated.
1878         updatePrivacyIcons(true);
1879     }
1880
1881     // `onResume()` runs after `onStart()`, which runs after `onCreate()` and `onRestart()`.
1882     @Override
1883     public void onResume() {
1884         // Run the default commands.
1885         super.onResume();
1886
1887         // Resume JavaScript (if enabled).
1888         mainWebView.resumeTimers();
1889
1890         // Resume `mainWebView`.
1891         mainWebView.onResume();
1892
1893         // Resume the adView for the free flavor.
1894         if (BuildConfig.FLAVOR.contentEquals("free")) {
1895             // Resume the ad.
1896             AdHelper.resumeAd(findViewById(R.id.adview));
1897         }
1898
1899         // Display a message to the user if waiting for Orbot.
1900         if (waitingForOrbot && !orbotStatus.equals("ON")) {
1901             // Load a waiting page.  `null` specifies no encoding, which defaults to ASCII.
1902             mainWebView.loadData(waitingForOrbotHTMLString, "text/html", null);
1903         }
1904
1905         if (displayingFullScreenVideo) {
1906             // Remove the translucent overlays.
1907             getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
1908
1909             // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
1910             drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
1911
1912             /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
1913              * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
1914              * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
1915              */
1916             rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
1917         }
1918     }
1919
1920     @Override
1921     public void onPause() {
1922         // Run the default commands.
1923         super.onPause();
1924
1925         // Pause `mainWebView`.
1926         mainWebView.onPause();
1927
1928         // Stop all JavaScript.
1929         mainWebView.pauseTimers();
1930
1931         // Pause the ad or it will continue to consume resources in the background on the free flavor.
1932         if (BuildConfig.FLAVOR.contentEquals("free")) {
1933             // Pause the ad.
1934             AdHelper.pauseAd(findViewById(R.id.adview));
1935         }
1936     }
1937
1938     @Override
1939     public void onDestroy() {
1940         // Unregister the Orbot status broadcast receiver.
1941         this.unregisterReceiver(orbotStatusBroadcastReceiver);
1942
1943         // Run the default commands.
1944         super.onDestroy();
1945     }
1946
1947     @Override
1948     public boolean onCreateOptionsMenu(Menu menu) {
1949         // Inflate the menu; this adds items to the action bar if it is present.
1950         getMenuInflater().inflate(R.menu.webview_options_menu, menu);
1951
1952         // Set mainMenu so it can be used by `onOptionsItemSelected()` and `updatePrivacyIcons`.
1953         mainMenu = menu;
1954
1955         // Set the initial status of the privacy icons.  `false` does not call `invalidateOptionsMenu` as the last step.
1956         updatePrivacyIcons(false);
1957
1958         // Get handles for the menu items.
1959         MenuItem toggleFirstPartyCookiesMenuItem = menu.findItem(R.id.toggle_first_party_cookies);
1960         MenuItem toggleThirdPartyCookiesMenuItem = menu.findItem(R.id.toggle_third_party_cookies);
1961         MenuItem toggleDomStorageMenuItem = menu.findItem(R.id.toggle_dom_storage);
1962         MenuItem toggleSaveFormDataMenuItem = menu.findItem(R.id.toggle_save_form_data);  // Form data can be removed once the minimum API >= 26.
1963         MenuItem clearFormDataMenuItem = menu.findItem(R.id.clear_form_data);  // Form data can be removed once the minimum API >= 26.
1964         refreshMenuItem = menu.findItem(R.id.refresh);
1965         blocklistsMenuItem = menu.findItem(R.id.blocklists);
1966         easyListMenuItem = menu.findItem(R.id.easylist);
1967         easyPrivacyMenuItem = menu.findItem(R.id.easyprivacy);
1968         fanboysAnnoyanceListMenuItem = menu.findItem(R.id.fanboys_annoyance_list);
1969         fanboysSocialBlockingListMenuItem = menu.findItem(R.id.fanboys_social_blocking_list);
1970         ultraPrivacyMenuItem = menu.findItem(R.id.ultraprivacy);
1971         blockAllThirdParyRequestsMenuItem = menu.findItem(R.id.block_all_third_party_requests);
1972         MenuItem adConsentMenuItem = menu.findItem(R.id.ad_consent);
1973
1974         // Only display third-party cookies if API >= 21
1975         toggleThirdPartyCookiesMenuItem.setVisible(Build.VERSION.SDK_INT >= 21);
1976
1977         // Only display the form data menu items if the API < 26.
1978         toggleSaveFormDataMenuItem.setVisible(Build.VERSION.SDK_INT < 26);
1979         clearFormDataMenuItem.setVisible(Build.VERSION.SDK_INT < 26);
1980
1981         // Only show Ad Consent if this is the free flavor.
1982         adConsentMenuItem.setVisible(BuildConfig.FLAVOR.contentEquals("free"));
1983
1984         // Get the shared preference values.
1985         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
1986
1987         // Get the status of the additional AppBar icons.
1988         displayAdditionalAppBarIcons = sharedPreferences.getBoolean("display_additional_app_bar_icons", false);
1989
1990         // Set the status of the additional app bar icons.  Setting the refresh menu item to `SHOW_AS_ACTION_ALWAYS` makes it appear even on small devices like phones.
1991         if (displayAdditionalAppBarIcons) {
1992             toggleFirstPartyCookiesMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
1993             toggleDomStorageMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
1994             refreshMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
1995         } else { //Do not display the additional icons.
1996             toggleFirstPartyCookiesMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
1997             toggleDomStorageMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
1998             refreshMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
1999         }
2000
2001         // Replace Refresh with Stop if a URL is already loading.
2002         if (urlIsLoading) {
2003             // Set the title.
2004             refreshMenuItem.setTitle(R.string.stop);
2005
2006             // If the icon is displayed in the AppBar, set it according to the theme.
2007             if (displayAdditionalAppBarIcons) {
2008                 if (darkTheme) {
2009                     refreshMenuItem.setIcon(R.drawable.close_dark);
2010                 } else {
2011                     refreshMenuItem.setIcon(R.drawable.close_light);
2012                 }
2013             }
2014         }
2015
2016         return true;
2017     }
2018
2019     @Override
2020     public boolean onPrepareOptionsMenu(Menu menu) {
2021         // Get handles for the menu items.
2022         MenuItem addOrEditDomain = menu.findItem(R.id.add_or_edit_domain);
2023         MenuItem toggleFirstPartyCookiesMenuItem = menu.findItem(R.id.toggle_first_party_cookies);
2024         MenuItem toggleThirdPartyCookiesMenuItem = menu.findItem(R.id.toggle_third_party_cookies);
2025         MenuItem toggleDomStorageMenuItem = menu.findItem(R.id.toggle_dom_storage);
2026         MenuItem toggleSaveFormDataMenuItem = menu.findItem(R.id.toggle_save_form_data);  // Form data can be removed once the minimum API >= 26.
2027         MenuItem clearDataMenuItem = menu.findItem(R.id.clear_data);
2028         MenuItem clearCookiesMenuItem = menu.findItem(R.id.clear_cookies);
2029         MenuItem clearDOMStorageMenuItem = menu.findItem(R.id.clear_dom_storage);
2030         MenuItem clearFormDataMenuItem = menu.findItem(R.id.clear_form_data);  // Form data can be removed once the minimum API >= 26.
2031         MenuItem fontSizeMenuItem = menu.findItem(R.id.font_size);
2032         MenuItem swipeToRefreshMenuItem = menu.findItem(R.id.swipe_to_refresh);
2033         MenuItem displayImagesMenuItem = menu.findItem(R.id.display_images);
2034
2035         // Set the text for the domain menu item.
2036         if (domainSettingsApplied) {
2037             addOrEditDomain.setTitle(R.string.edit_domain_settings);
2038         } else {
2039             addOrEditDomain.setTitle(R.string.add_domain_settings);
2040         }
2041
2042         // Set the status of the menu item checkboxes.
2043         toggleFirstPartyCookiesMenuItem.setChecked(firstPartyCookiesEnabled);
2044         toggleThirdPartyCookiesMenuItem.setChecked(thirdPartyCookiesEnabled);
2045         toggleDomStorageMenuItem.setChecked(domStorageEnabled);
2046         toggleSaveFormDataMenuItem.setChecked(saveFormDataEnabled);  // Form data can be removed once the minimum API >= 26.
2047         easyListMenuItem.setChecked(easyListEnabled);
2048         easyPrivacyMenuItem.setChecked(easyPrivacyEnabled);
2049         fanboysAnnoyanceListMenuItem.setChecked(fanboysAnnoyanceListEnabled);
2050         fanboysSocialBlockingListMenuItem.setChecked(fanboysSocialBlockingListEnabled);
2051         ultraPrivacyMenuItem.setChecked(ultraPrivacyEnabled);
2052         blockAllThirdParyRequestsMenuItem.setChecked(blockAllThirdPartyRequests);
2053         swipeToRefreshMenuItem.setChecked(swipeRefreshLayout.isEnabled());
2054         displayImagesMenuItem.setChecked(mainWebView.getSettings().getLoadsImagesAutomatically());
2055
2056         // Enable third-party cookies if first-party cookies are enabled.
2057         toggleThirdPartyCookiesMenuItem.setEnabled(firstPartyCookiesEnabled);
2058
2059         // Enable DOM Storage if JavaScript is enabled.
2060         toggleDomStorageMenuItem.setEnabled(javaScriptEnabled);
2061
2062         // Enable Clear Cookies if there are any.
2063         clearCookiesMenuItem.setEnabled(cookieManager.hasCookies());
2064
2065         // Get a count of the number of files in the Local Storage directory.
2066         File localStorageDirectory = new File (privateDataDirectoryString + "/app_webview/Local Storage/");
2067         int localStorageDirectoryNumberOfFiles = 0;
2068         if (localStorageDirectory.exists()) {
2069             localStorageDirectoryNumberOfFiles = localStorageDirectory.list().length;
2070         }
2071
2072         // Get a count of the number of files in the IndexedDB directory.
2073         File indexedDBDirectory = new File (privateDataDirectoryString + "/app_webview/IndexedDB");
2074         int indexedDBDirectoryNumberOfFiles = 0;
2075         if (indexedDBDirectory.exists()) {
2076             indexedDBDirectoryNumberOfFiles = indexedDBDirectory.list().length;
2077         }
2078
2079         // Enable Clear DOM Storage if there is any.
2080         clearDOMStorageMenuItem.setEnabled(localStorageDirectoryNumberOfFiles > 0 || indexedDBDirectoryNumberOfFiles > 0);
2081
2082         // Enable Clear Form Data is there is any.  This can be removed once the minimum API >= 26.
2083         if (Build.VERSION.SDK_INT < 26) {
2084             WebViewDatabase mainWebViewDatabase = WebViewDatabase.getInstance(this);
2085             clearFormDataMenuItem.setEnabled(mainWebViewDatabase.hasFormData());
2086         } else {
2087             // Disable clear form data because it is not supported on current version of Android.
2088             clearFormDataMenuItem.setEnabled(false);
2089         }
2090
2091         // Enable Clear Data if any of the submenu items are enabled.
2092         clearDataMenuItem.setEnabled(clearCookiesMenuItem.isEnabled() || clearDOMStorageMenuItem.isEnabled() || clearFormDataMenuItem.isEnabled());
2093
2094         // Disable Fanboy's Social Blocking List if Fanboy's Annoyance List is checked.
2095         fanboysSocialBlockingListMenuItem.setEnabled(!fanboysAnnoyanceListEnabled);
2096
2097         // Initialize the display names for the blocklists with the number of blocked requests.
2098         blocklistsMenuItem.setTitle(getString(R.string.blocklists) + " - " + blockedRequests);
2099         easyListMenuItem.setTitle(easyListBlockedRequests + " - " + getString(R.string.easylist));
2100         easyPrivacyMenuItem.setTitle(easyPrivacyBlockedRequests + " - " + getString(R.string.easyprivacy));
2101         fanboysAnnoyanceListMenuItem.setTitle(fanboysAnnoyanceListBlockedRequests + " - " + getString(R.string.fanboys_annoyance_list));
2102         fanboysSocialBlockingListMenuItem.setTitle(fanboysSocialBlockingListBlockedRequests + " - " + getString(R.string.fanboys_social_blocking_list));
2103         ultraPrivacyMenuItem.setTitle(ultraPrivacyBlockedRequests + " - " + getString(R.string.ultraprivacy));
2104         blockAllThirdParyRequestsMenuItem.setTitle(thirdPartyBlockedRequests + " - " + getString(R.string.block_all_third_party_requests));
2105
2106         // Initialize font size variables.
2107         int fontSize = mainWebView.getSettings().getTextZoom();
2108         String fontSizeTitle;
2109         MenuItem selectedFontSizeMenuItem;
2110
2111         // Prepare the font size title and current size menu item.
2112         switch (fontSize) {
2113             case 25:
2114                 fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.twenty_five_percent);
2115                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_twenty_five_percent);
2116                 break;
2117
2118             case 50:
2119                 fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.fifty_percent);
2120                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_fifty_percent);
2121                 break;
2122
2123             case 75:
2124                 fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.seventy_five_percent);
2125                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_seventy_five_percent);
2126                 break;
2127
2128             case 100:
2129                 fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.one_hundred_percent);
2130                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_percent);
2131                 break;
2132
2133             case 125:
2134                 fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.one_hundred_twenty_five_percent);
2135                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_twenty_five_percent);
2136                 break;
2137
2138             case 150:
2139                 fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.one_hundred_fifty_percent);
2140                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_fifty_percent);
2141                 break;
2142
2143             case 175:
2144                 fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.one_hundred_seventy_five_percent);
2145                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_seventy_five_percent);
2146                 break;
2147
2148             case 200:
2149                 fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.two_hundred_percent);
2150                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_two_hundred_percent);
2151                 break;
2152
2153             default:
2154                 fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.one_hundred_percent);
2155                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_percent);
2156                 break;
2157         }
2158
2159         // Set the font size title and select the current size menu item.
2160         fontSizeMenuItem.setTitle(fontSizeTitle);
2161         selectedFontSizeMenuItem.setChecked(true);
2162
2163         // Run all the other default commands.
2164         super.onPrepareOptionsMenu(menu);
2165
2166         // Display the menu.
2167         return true;
2168     }
2169
2170     @Override
2171     // Remove Android Studio's warning about the dangers of using SetJavaScriptEnabled.
2172     @SuppressLint("SetJavaScriptEnabled")
2173     // removeAllCookies is deprecated, but it is required for API < 21.
2174     @SuppressWarnings("deprecation")
2175     public boolean onOptionsItemSelected(MenuItem menuItem) {
2176         // Get the selected menu item ID.
2177         int menuItemId = menuItem.getItemId();
2178
2179         // Set the commands that relate to the menu entries.
2180         switch (menuItemId) {
2181             case R.id.toggle_javascript:
2182                 // Switch the status of javaScriptEnabled.
2183                 javaScriptEnabled = !javaScriptEnabled;
2184
2185                 // Apply the new JavaScript status.
2186                 mainWebView.getSettings().setJavaScriptEnabled(javaScriptEnabled);
2187
2188                 // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
2189                 updatePrivacyIcons(true);
2190
2191                 // Display a `Snackbar`.
2192                 if (javaScriptEnabled) {  // JavaScrip is enabled.
2193                     Snackbar.make(findViewById(R.id.main_webview), R.string.javascript_enabled, Snackbar.LENGTH_SHORT).show();
2194                 } else if (firstPartyCookiesEnabled) {  // JavaScript is disabled, but first-party cookies are enabled.
2195                     Snackbar.make(findViewById(R.id.main_webview), R.string.javascript_disabled, Snackbar.LENGTH_SHORT).show();
2196                 } else {  // Privacy mode.
2197                     Snackbar.make(findViewById(R.id.main_webview), R.string.privacy_mode, Snackbar.LENGTH_SHORT).show();
2198                 }
2199
2200                 // Reload the WebView.
2201                 mainWebView.reload();
2202                 return true;
2203
2204             case R.id.add_or_edit_domain:
2205                 if (domainSettingsApplied) {  // Edit the current domain settings.
2206                     // Reapply the domain settings on returning to `MainWebViewActivity`.
2207                     reapplyDomainSettingsOnRestart = true;
2208                     currentDomainName = "";
2209
2210                     // Create an intent to launch the domains activity.
2211                     Intent domainsIntent = new Intent(this, DomainsActivity.class);
2212
2213                     // Put extra information instructing the domains activity to directly load the current domain and close on back instead of returning to the domains list.
2214                     domainsIntent.putExtra("loadDomain", domainSettingsDatabaseId);
2215                     domainsIntent.putExtra("closeOnBack", true);
2216
2217                     // Make it so.
2218                     startActivity(domainsIntent);
2219                 } else {  // Add a new domain.
2220                     // Apply the new domain settings on returning to `MainWebViewActivity`.
2221                     reapplyDomainSettingsOnRestart = true;
2222                     currentDomainName = "";
2223
2224                     // Get the current domain
2225                     Uri currentUri = Uri.parse(formattedUrlString);
2226                     String currentDomain = currentUri.getHost();
2227
2228                     // Initialize the database handler.  The `0` specifies the database version, but that is ignored and set instead using a constant in `DomainsDatabaseHelper`.
2229                     DomainsDatabaseHelper domainsDatabaseHelper = new DomainsDatabaseHelper(this, null, null, 0);
2230
2231                     // Create the domain and store the database ID.
2232                     int newDomainDatabaseId = domainsDatabaseHelper.addDomain(currentDomain);
2233
2234                     // Create an intent to launch the domains activity.
2235                     Intent domainsIntent = new Intent(this, DomainsActivity.class);
2236
2237                     // Put extra information instructing the domains activity to directly load the new domain and close on back instead of returning to the domains list.
2238                     domainsIntent.putExtra("loadDomain", newDomainDatabaseId);
2239                     domainsIntent.putExtra("closeOnBack", true);
2240
2241                     // Make it so.
2242                     startActivity(domainsIntent);
2243                 }
2244                 return true;
2245
2246             case R.id.toggle_first_party_cookies:
2247                 // Switch the status of firstPartyCookiesEnabled.
2248                 firstPartyCookiesEnabled = !firstPartyCookiesEnabled;
2249
2250                 // Update the menu checkbox.
2251                 menuItem.setChecked(firstPartyCookiesEnabled);
2252
2253                 // Apply the new cookie status.
2254                 cookieManager.setAcceptCookie(firstPartyCookiesEnabled);
2255
2256                 // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
2257                 updatePrivacyIcons(true);
2258
2259                 // Display a `Snackbar`.
2260                 if (firstPartyCookiesEnabled) {  // First-party cookies are enabled.
2261                     Snackbar.make(findViewById(R.id.main_webview), R.string.first_party_cookies_enabled, Snackbar.LENGTH_SHORT).show();
2262                 } else if (javaScriptEnabled) {  // JavaScript is still enabled.
2263                     Snackbar.make(findViewById(R.id.main_webview), R.string.first_party_cookies_disabled, Snackbar.LENGTH_SHORT).show();
2264                 } else {  // Privacy mode.
2265                     Snackbar.make(findViewById(R.id.main_webview), R.string.privacy_mode, Snackbar.LENGTH_SHORT).show();
2266                 }
2267
2268                 // Reload the WebView.
2269                 mainWebView.reload();
2270                 return true;
2271
2272             case R.id.toggle_third_party_cookies:
2273                 if (Build.VERSION.SDK_INT >= 21) {
2274                     // Switch the status of thirdPartyCookiesEnabled.
2275                     thirdPartyCookiesEnabled = !thirdPartyCookiesEnabled;
2276
2277                     // Update the menu checkbox.
2278                     menuItem.setChecked(thirdPartyCookiesEnabled);
2279
2280                     // Apply the new cookie status.
2281                     cookieManager.setAcceptThirdPartyCookies(mainWebView, thirdPartyCookiesEnabled);
2282
2283                     // Display a `Snackbar`.
2284                     if (thirdPartyCookiesEnabled) {
2285                         Snackbar.make(findViewById(R.id.main_webview), R.string.third_party_cookies_enabled, Snackbar.LENGTH_SHORT).show();
2286                     } else {
2287                         Snackbar.make(findViewById(R.id.main_webview), R.string.third_party_cookies_disabled, Snackbar.LENGTH_SHORT).show();
2288                     }
2289
2290                     // Reload the WebView.
2291                     mainWebView.reload();
2292                 } // Else do nothing because SDK < 21.
2293                 return true;
2294
2295             case R.id.toggle_dom_storage:
2296                 // Switch the status of domStorageEnabled.
2297                 domStorageEnabled = !domStorageEnabled;
2298
2299                 // Update the menu checkbox.
2300                 menuItem.setChecked(domStorageEnabled);
2301
2302                 // Apply the new DOM Storage status.
2303                 mainWebView.getSettings().setDomStorageEnabled(domStorageEnabled);
2304
2305                 // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
2306                 updatePrivacyIcons(true);
2307
2308                 // Display a `Snackbar`.
2309                 if (domStorageEnabled) {
2310                     Snackbar.make(findViewById(R.id.main_webview), R.string.dom_storage_enabled, Snackbar.LENGTH_SHORT).show();
2311                 } else {
2312                     Snackbar.make(findViewById(R.id.main_webview), R.string.dom_storage_disabled, Snackbar.LENGTH_SHORT).show();
2313                 }
2314
2315                 // Reload the WebView.
2316                 mainWebView.reload();
2317                 return true;
2318
2319             // Form data can be removed once the minimum API >= 26.
2320             case R.id.toggle_save_form_data:
2321                 // Switch the status of saveFormDataEnabled.
2322                 saveFormDataEnabled = !saveFormDataEnabled;
2323
2324                 // Update the menu checkbox.
2325                 menuItem.setChecked(saveFormDataEnabled);
2326
2327                 // Apply the new form data status.
2328                 mainWebView.getSettings().setSaveFormData(saveFormDataEnabled);
2329
2330                 // Display a `Snackbar`.
2331                 if (saveFormDataEnabled) {
2332                     Snackbar.make(findViewById(R.id.main_webview), R.string.form_data_enabled, Snackbar.LENGTH_SHORT).show();
2333                 } else {
2334                     Snackbar.make(findViewById(R.id.main_webview), R.string.form_data_disabled, Snackbar.LENGTH_SHORT).show();
2335                 }
2336
2337                 // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
2338                 updatePrivacyIcons(true);
2339
2340                 // Reload the WebView.
2341                 mainWebView.reload();
2342                 return true;
2343
2344             case R.id.clear_cookies:
2345                 Snackbar.make(findViewById(R.id.main_webview), R.string.cookies_deleted, Snackbar.LENGTH_LONG)
2346                         .setAction(R.string.undo, v -> {
2347                             // Do nothing because everything will be handled by `onDismissed()` below.
2348                         })
2349                         .addCallback(new Snackbar.Callback() {
2350                             @Override
2351                             public void onDismissed(Snackbar snackbar, int event) {
2352                                 switch (event) {
2353                                     // The user pushed the `Undo` button.
2354                                     case Snackbar.Callback.DISMISS_EVENT_ACTION:
2355                                         // Do nothing.
2356                                         break;
2357
2358                                     // The `Snackbar` was dismissed without the `Undo` button being pushed.
2359                                     default:
2360                                         // `cookieManager.removeAllCookie()` varies by SDK.
2361                                         if (Build.VERSION.SDK_INT < 21) {
2362                                             cookieManager.removeAllCookie();
2363                                         } else {
2364                                             // `null` indicates no callback.
2365                                             cookieManager.removeAllCookies(null);
2366                                         }
2367                                 }
2368                             }
2369                         })
2370                         .show();
2371                 return true;
2372
2373             case R.id.clear_dom_storage:
2374                 Snackbar.make(findViewById(R.id.main_webview), R.string.dom_storage_deleted, Snackbar.LENGTH_LONG)
2375                         .setAction(R.string.undo, v -> {
2376                             // Do nothing because everything will be handled by `onDismissed()` below.
2377                         })
2378                         .addCallback(new Snackbar.Callback() {
2379                             @Override
2380                             public void onDismissed(Snackbar snackbar, int event) {
2381                                 switch (event) {
2382                                     // The user pushed the `Undo` button.
2383                                     case Snackbar.Callback.DISMISS_EVENT_ACTION:
2384                                         // Do nothing.
2385                                         break;
2386
2387                                     // The `Snackbar` was dismissed without the `Undo` button being pushed.
2388                                     default:
2389                                         // Delete the DOM Storage.
2390                                         WebStorage webStorage = WebStorage.getInstance();
2391                                         webStorage.deleteAllData();
2392
2393                                         // Manually delete the DOM storage files and directories.
2394                                         try {
2395                                             // A `String[]` must be used because the directory contains a space and `Runtime.exec` will otherwise not escape the string correctly.
2396                                             privacyBrowserRuntime.exec(new String[] {"rm", "-rf", privateDataDirectoryString + "/app_webview/Local Storage/"});
2397
2398                                             // Multiple commands must be used because `Runtime.exec()` does not like `*`.
2399                                             privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/app_webview/IndexedDB");
2400                                             privacyBrowserRuntime.exec("rm -f " + privateDataDirectoryString + "/app_webview/QuotaManager");
2401                                             privacyBrowserRuntime.exec("rm -f " + privateDataDirectoryString + "/app_webview/QuotaManager-journal");
2402                                             privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/app_webview/databases");
2403                                         } catch (IOException e) {
2404                                             // Do nothing if an error is thrown.
2405                                         }
2406                                 }
2407                             }
2408                         })
2409                         .show();
2410                 return true;
2411
2412             // Form data can be remove once the minimum API >= 26.
2413             case R.id.clear_form_data:
2414                 Snackbar.make(findViewById(R.id.main_webview), R.string.form_data_deleted, Snackbar.LENGTH_LONG)
2415                         .setAction(R.string.undo, v -> {
2416                             // Do nothing because everything will be handled by `onDismissed()` below.
2417                         })
2418                         .addCallback(new Snackbar.Callback() {
2419                             @Override
2420                             public void onDismissed(Snackbar snackbar, int event) {
2421                                 switch (event) {
2422                                     // The user pushed the `Undo` button.
2423                                     case Snackbar.Callback.DISMISS_EVENT_ACTION:
2424                                         // Do nothing.
2425                                         break;
2426
2427                                     // The `Snackbar` was dismissed without the `Undo` button being pushed.
2428                                     default:
2429                                         // Delete the form data.
2430                                         WebViewDatabase mainWebViewDatabase = WebViewDatabase.getInstance(getApplicationContext());
2431                                         mainWebViewDatabase.clearFormData();
2432                                 }
2433                             }
2434                         })
2435                         .show();
2436                 return true;
2437
2438             case R.id.font_size_twenty_five_percent:
2439                 mainWebView.getSettings().setTextZoom(25);
2440                 return true;
2441
2442             case R.id.font_size_fifty_percent:
2443                 mainWebView.getSettings().setTextZoom(50);
2444                 return true;
2445
2446             case R.id.font_size_seventy_five_percent:
2447                 mainWebView.getSettings().setTextZoom(75);
2448                 return true;
2449
2450             case R.id.font_size_one_hundred_percent:
2451                 mainWebView.getSettings().setTextZoom(100);
2452                 return true;
2453
2454             case R.id.font_size_one_hundred_twenty_five_percent:
2455                 mainWebView.getSettings().setTextZoom(125);
2456                 return true;
2457
2458             case R.id.font_size_one_hundred_fifty_percent:
2459                 mainWebView.getSettings().setTextZoom(150);
2460                 return true;
2461
2462             case R.id.font_size_one_hundred_seventy_five_percent:
2463                 mainWebView.getSettings().setTextZoom(175);
2464                 return true;
2465
2466             case R.id.font_size_two_hundred_percent:
2467                 mainWebView.getSettings().setTextZoom(200);
2468                 return true;
2469
2470             case R.id.swipe_to_refresh:
2471                 // Toggle swipe to refresh.
2472                 swipeRefreshLayout.setEnabled(!swipeRefreshLayout.isEnabled());
2473                 return true;
2474
2475             case R.id.display_images:
2476                 if (mainWebView.getSettings().getLoadsImagesAutomatically()) {  // Images are currently loaded automatically.
2477                     mainWebView.getSettings().setLoadsImagesAutomatically(false);
2478                     mainWebView.reload();
2479                 } else {  // Images are not currently loaded automatically.
2480                     mainWebView.getSettings().setLoadsImagesAutomatically(true);
2481                 }
2482
2483                 // Set `onTheFlyDisplayImagesSet`.
2484                 onTheFlyDisplayImagesSet = true;
2485                 return true;
2486
2487             case R.id.view_source:
2488                 // Launch the View Source activity.
2489                 Intent viewSourceIntent = new Intent(this, ViewSourceActivity.class);
2490                 startActivity(viewSourceIntent);
2491                 return true;
2492
2493             case R.id.easylist:
2494                 // Toggle the EasyList status.
2495                 easyListEnabled = !easyListEnabled;
2496
2497                 // Update the menu checkbox.
2498                 menuItem.setChecked(easyListEnabled);
2499
2500                 // Reload the main WebView.
2501                 mainWebView.reload();
2502                 return true;
2503
2504             case R.id.easyprivacy:
2505                 // Toggle the EasyPrivacy status.
2506                 easyPrivacyEnabled = !easyPrivacyEnabled;
2507
2508                 // Update the menu checkbox.
2509                 menuItem.setChecked(easyPrivacyEnabled);
2510
2511                 // Reload the main WebView.
2512                 mainWebView.reload();
2513                 return true;
2514
2515             case R.id.fanboys_annoyance_list:
2516                 // Toggle Fanboy's Annoyance List status.
2517                 fanboysAnnoyanceListEnabled = !fanboysAnnoyanceListEnabled;
2518
2519                 // Update the menu checkbox.
2520                 menuItem.setChecked(fanboysAnnoyanceListEnabled);
2521
2522                 // Update the staus of Fanboy's Social Blocking List.
2523                 MenuItem fanboysSocialBlockingListMenuItem = mainMenu.findItem(R.id.fanboys_social_blocking_list);
2524                 fanboysSocialBlockingListMenuItem.setEnabled(!fanboysAnnoyanceListEnabled);
2525
2526                 // Reload the main WebView.
2527                 mainWebView.reload();
2528                 return true;
2529
2530             case R.id.fanboys_social_blocking_list:
2531                 // Toggle Fanboy's Social Blocking List status.
2532                 fanboysSocialBlockingListEnabled = !fanboysSocialBlockingListEnabled;
2533
2534                 // Update the menu checkbox.
2535                 menuItem.setChecked(fanboysSocialBlockingListEnabled);
2536
2537                 // Reload the main WebView.
2538                 mainWebView.reload();
2539                 return true;
2540
2541             case R.id.ultraprivacy:
2542                 // Toggle the UltraPrivacy status.
2543                 ultraPrivacyEnabled = !ultraPrivacyEnabled;
2544
2545                 // Update the menu checkbox.
2546                 menuItem.setChecked(ultraPrivacyEnabled);
2547
2548                 // Reload the main WebView.
2549                 mainWebView.reload();
2550                 return true;
2551
2552             case R.id.block_all_third_party_requests:
2553                 //Toggle the third-party requests blocker status.
2554                 blockAllThirdPartyRequests = !blockAllThirdPartyRequests;
2555
2556                 // Update the menu checkbox.
2557                 menuItem.setChecked(blockAllThirdPartyRequests);
2558
2559                 // Reload the main WebView.
2560                 mainWebView.reload();
2561                 return true;
2562
2563             case R.id.share:
2564                 // Setup the share string.
2565                 String shareString = webViewTitle + " – " + urlTextBox.getText().toString();
2566
2567                 // Create the share intent.
2568                 Intent shareIntent = new Intent();
2569                 shareIntent.setAction(Intent.ACTION_SEND);
2570                 shareIntent.putExtra(Intent.EXTRA_TEXT, shareString);
2571                 shareIntent.setType("text/plain");
2572
2573                 // Make it so.
2574                 startActivity(Intent.createChooser(shareIntent, "Share URL"));
2575                 return true;
2576
2577             case R.id.find_on_page:
2578                 // Hide the URL app bar.
2579                 supportAppBar.setVisibility(View.GONE);
2580
2581                 // Show the Find on Page `RelativeLayout`.
2582                 findOnPageLinearLayout.setVisibility(View.VISIBLE);
2583
2584                 // Display the keyboard.  We have to wait 200 ms before running the command to work around a bug in Android.
2585                 // http://stackoverflow.com/questions/5520085/android-show-softkeyboard-with-showsoftinput-is-not-working
2586                 findOnPageEditText.postDelayed(() -> {
2587                     // Set the focus on `findOnPageEditText`.
2588                     findOnPageEditText.requestFocus();
2589
2590                     // Display the keyboard.  `0` sets no input flags.
2591                     inputMethodManager.showSoftInput(findOnPageEditText, 0);
2592                 }, 200);
2593                 return true;
2594
2595             case R.id.print:
2596                 // Get a `PrintManager` instance.
2597                 PrintManager printManager = (PrintManager) getSystemService(Context.PRINT_SERVICE);
2598
2599                 // Convert `mainWebView` to `printDocumentAdapter`.
2600                 PrintDocumentAdapter printDocumentAdapter = mainWebView.createPrintDocumentAdapter();
2601
2602                 // Remove the lint error below that `printManager` might be `null`.
2603                 assert printManager != null;
2604
2605                 // Print the document.  The print attributes are `null`.
2606                 printManager.print(getString(R.string.privacy_browser_web_page), printDocumentAdapter, null);
2607                 return true;
2608
2609             case R.id.add_to_homescreen:
2610                 // Show the `CreateHomeScreenShortcutDialog` `AlertDialog` and name this instance `R.string.create_shortcut`.
2611                 AppCompatDialogFragment createHomeScreenShortcutDialogFragment = new CreateHomeScreenShortcutDialog();
2612                 createHomeScreenShortcutDialogFragment.show(getSupportFragmentManager(), getString(R.string.create_shortcut));
2613
2614                 //Everything else will be handled by `CreateHomeScreenShortcutDialog` and the associated listener below.
2615                 return true;
2616
2617             case R.id.refresh:
2618                 if (menuItem.getTitle().equals(getString(R.string.refresh))) {  // The refresh button was pushed.
2619                     // Reload the WebView.
2620                     mainWebView.reload();
2621                 } else {  // The stop button was pushed.
2622                     // Stop the loading of the WebView.
2623                     mainWebView.stopLoading();
2624                 }
2625                 return true;
2626
2627             case R.id.ad_consent:
2628                 // Display the ad consent dialog.
2629                 DialogFragment adConsentDialogFragment = new AdConsentDialog();
2630                 adConsentDialogFragment.show(getFragmentManager(), getString(R.string.ad_consent));
2631                 return true;
2632
2633             default:
2634                 // Don't consume the event.
2635                 return super.onOptionsItemSelected(menuItem);
2636         }
2637     }
2638
2639     // removeAllCookies is deprecated, but it is required for API < 21.
2640     @SuppressWarnings("deprecation")
2641     @Override
2642     public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
2643         int menuItemId = menuItem.getItemId();
2644
2645         switch (menuItemId) {
2646             case R.id.home:
2647                 loadUrl(homepage);
2648                 break;
2649
2650             case R.id.back:
2651                 if (mainWebView.canGoBack()) {
2652                     // Reset the formatted URL string so the page will load correctly if blocking of third-party requests is enabled.
2653                     formattedUrlString = "";
2654
2655                     // Set `navigatingHistory` so that the domain settings are applied when the new URL is loaded.
2656                     navigatingHistory = true;
2657
2658                     // Load the previous website in the history.
2659                     mainWebView.goBack();
2660                 }
2661                 break;
2662
2663             case R.id.forward:
2664                 if (mainWebView.canGoForward()) {
2665                     // Reset the formatted URL string so the page will load correctly if blocking of third-party requests is enabled.
2666                     formattedUrlString = "";
2667
2668                     // Set `navigatingHistory` so that the domain settings are applied when the new URL is loaded.
2669                     navigatingHistory = true;
2670
2671                     // Load the next website in the history.
2672                     mainWebView.goForward();
2673                 }
2674                 break;
2675
2676             case R.id.history:
2677                 // Get the `WebBackForwardList`.
2678                 WebBackForwardList webBackForwardList = mainWebView.copyBackForwardList();
2679
2680                 // Show the `UrlHistoryDialog` `AlertDialog` and name this instance `R.string.history`.  `this` is the `Context`.
2681                 AppCompatDialogFragment urlHistoryDialogFragment = UrlHistoryDialog.loadBackForwardList(this, webBackForwardList);
2682                 urlHistoryDialogFragment.show(getSupportFragmentManager(), getString(R.string.history));
2683                 break;
2684
2685             case R.id.requests:
2686                 // Launch the requests activity.
2687                 Intent requestsIntent = new Intent(this, RequestsActivity.class);
2688                 startActivity(requestsIntent);
2689                 break;
2690
2691             case R.id.downloads:
2692                 // Launch the system Download Manager.
2693                 Intent downloadManagerIntent = new Intent(DownloadManager.ACTION_VIEW_DOWNLOADS);
2694
2695                 // Launch as a new task so that Download Manager and Privacy Browser show as separate windows in the recent tasks list.
2696                 downloadManagerIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
2697
2698                 startActivity(downloadManagerIntent);
2699                 break;
2700
2701             case R.id.domains:
2702                 // Set the flag to reapply the domain settings on restart when returning from Domain Settings.
2703                 reapplyDomainSettingsOnRestart = true;
2704                 currentDomainName = "";
2705
2706                 // Launch the domains activity.
2707                 Intent domainsIntent = new Intent(this, DomainsActivity.class);
2708                 startActivity(domainsIntent);
2709                 break;
2710
2711             case R.id.settings:
2712                 // Set the flag to reapply app settings on restart when returning from Settings.
2713                 reapplyAppSettingsOnRestart = true;
2714
2715                 // Set the flag to reapply the domain settings on restart when returning from Settings.
2716                 reapplyDomainSettingsOnRestart = true;
2717                 currentDomainName = "";
2718
2719                 // Launch the settings activity.
2720                 Intent settingsIntent = new Intent(this, SettingsActivity.class);
2721                 startActivity(settingsIntent);
2722                 break;
2723
2724             case R.id.guide:
2725                 // Launch `GuideActivity`.
2726                 Intent guideIntent = new Intent(this, GuideActivity.class);
2727                 startActivity(guideIntent);
2728                 break;
2729
2730             case R.id.about:
2731                 // Launch `AboutActivity`.
2732                 Intent aboutIntent = new Intent(this, AboutActivity.class);
2733                 startActivity(aboutIntent);
2734                 break;
2735
2736             case R.id.clearAndExit:
2737                 // Get a handle for `sharedPreferences`.  `this` references the current context.
2738                 SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
2739
2740                 boolean clearEverything = sharedPreferences.getBoolean("clear_everything", true);
2741
2742                 // Clear cookies.
2743                 if (clearEverything || sharedPreferences.getBoolean("clear_cookies", true)) {
2744                     // The command to remove cookies changed slightly in API 21.
2745                     if (Build.VERSION.SDK_INT >= 21) {
2746                         cookieManager.removeAllCookies(null);
2747                     } else {
2748                         cookieManager.removeAllCookie();
2749                     }
2750
2751                     // Manually delete the cookies database, as `CookieManager` sometimes will not flush its changes to disk before `System.exit(0)` is run.
2752                     try {
2753                         // We have to use two commands because `Runtime.exec()` does not like `*`.
2754                         privacyBrowserRuntime.exec("rm -f " + privateDataDirectoryString + "/app_webview/Cookies");
2755                         privacyBrowserRuntime.exec("rm -f " + privateDataDirectoryString + "/app_webview/Cookies-journal");
2756                     } catch (IOException e) {
2757                         // Do nothing if an error is thrown.
2758                     }
2759                 }
2760
2761                 // Clear DOM storage.
2762                 if (clearEverything || sharedPreferences.getBoolean("clear_dom_storage", true)) {
2763                     // Ask `WebStorage` to clear the DOM storage.
2764                     WebStorage webStorage = WebStorage.getInstance();
2765                     webStorage.deleteAllData();
2766
2767                     // Manually delete the DOM storage files and directories, as `WebStorage` sometimes will not flush its changes to disk before `System.exit(0)` is run.
2768                     try {
2769                         // A `String[]` must be used because the directory contains a space and `Runtime.exec` will otherwise not escape the string correctly.
2770                         privacyBrowserRuntime.exec(new String[] {"rm", "-rf", privateDataDirectoryString + "/app_webview/Local Storage/"});
2771
2772                         // Multiple commands must be used because `Runtime.exec()` does not like `*`.
2773                         privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/app_webview/IndexedDB");
2774                         privacyBrowserRuntime.exec("rm -f " + privateDataDirectoryString + "/app_webview/QuotaManager");
2775                         privacyBrowserRuntime.exec("rm -f " + privateDataDirectoryString + "/app_webview/QuotaManager-journal");
2776                         privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/app_webview/databases");
2777                     } catch (IOException e) {
2778                         // Do nothing if an error is thrown.
2779                     }
2780                 }
2781
2782                 // Clear form data if the API < 26.
2783                 if ((Build.VERSION.SDK_INT < 26) && (clearEverything || sharedPreferences.getBoolean("clear_form_data", true))) {
2784                     WebViewDatabase webViewDatabase = WebViewDatabase.getInstance(this);
2785                     webViewDatabase.clearFormData();
2786
2787                     // Manually delete the form data database, as `WebViewDatabase` sometimes will not flush its changes to disk before `System.exit(0)` is run.
2788                     try {
2789                         // We have to use a `String[]` because the database contains a space and `Runtime.exec` will not escape the string correctly otherwise.
2790                         privacyBrowserRuntime.exec(new String[] {"rm", "-f", privateDataDirectoryString + "/app_webview/Web Data"});
2791                         privacyBrowserRuntime.exec(new String[] {"rm", "-f", privateDataDirectoryString + "/app_webview/Web Data-journal"});
2792                     } catch (IOException e) {
2793                         // Do nothing if an error is thrown.
2794                     }
2795                 }
2796
2797                 // Clear the cache.
2798                 if (clearEverything || sharedPreferences.getBoolean("clear_cache", true)) {
2799                     // `true` includes disk files.
2800                     mainWebView.clearCache(true);
2801
2802                     // Manually delete the cache directories.
2803                     try {
2804                         // Delete the main cache directory.
2805                         privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/cache");
2806
2807                         // Delete the secondary `Service Worker` cache directory.
2808                         // A `String[]` must be used because the directory contains a space and `Runtime.exec` will not escape the string correctly otherwise.
2809                         privacyBrowserRuntime.exec(new String[] {"rm", "-rf", privateDataDirectoryString + "/app_webview/Service Worker/"});
2810                     } catch (IOException e) {
2811                         // Do nothing if an error is thrown.
2812                     }
2813                 }
2814
2815                 // Clear SSL certificate preferences.
2816                 mainWebView.clearSslPreferences();
2817
2818                 // Clear the back/forward history.
2819                 mainWebView.clearHistory();
2820
2821                 // Clear `formattedUrlString`.
2822                 formattedUrlString = null;
2823
2824                 // Clear `customHeaders`.
2825                 customHeaders.clear();
2826
2827                 // Detach all views from `mainWebViewRelativeLayout`.
2828                 mainWebViewRelativeLayout.removeAllViews();
2829
2830                 // Destroy the internal state of `mainWebView`.
2831                 mainWebView.destroy();
2832
2833                 // Manually delete the `app_webview` folder, which contains the cookies, DOM storage, form data, and `Service Worker` cache.
2834                 // See `https://code.google.com/p/android/issues/detail?id=233826&thanks=233826&ts=1486670530`.
2835                 if (clearEverything) {
2836                     try {
2837                         privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/app_webview");
2838                     } catch (IOException e) {
2839                         // Do nothing if an error is thrown.
2840                     }
2841                 }
2842
2843                 // Close Privacy Browser.  `finishAndRemoveTask` also removes Privacy Browser from the recent app list.
2844                 if (Build.VERSION.SDK_INT >= 21) {
2845                     finishAndRemoveTask();
2846                 } else {
2847                     finish();
2848                 }
2849
2850                 // Remove the terminated program from RAM.  The status code is `0`.
2851                 System.exit(0);
2852                 break;
2853         }
2854
2855         // Close the navigation drawer.
2856         drawerLayout.closeDrawer(GravityCompat.START);
2857         return true;
2858     }
2859
2860     @Override
2861     public void onPostCreate(Bundle savedInstanceState) {
2862         super.onPostCreate(savedInstanceState);
2863
2864         // Sync the state of the DrawerToggle after onRestoreInstanceState has finished.
2865         drawerToggle.syncState();
2866     }
2867
2868     @Override
2869     public void onConfigurationChanged(Configuration newConfig) {
2870         super.onConfigurationChanged(newConfig);
2871
2872         // Reload the ad for the free flavor if we not in full screen mode.
2873         if (BuildConfig.FLAVOR.contentEquals("free") && !inFullScreenBrowsingMode) {
2874             // Reload the ad.  The AdView is destroyed and recreated, which changes the ID, every time it is reloaded to handle possible rotations.
2875             AdHelper.loadAd(findViewById(R.id.adview), getApplicationContext(), getString(R.string.ad_id));
2876         }
2877
2878         // `invalidateOptionsMenu` should recalculate the number of action buttons from the menu to display on the app bar, but it doesn't because of the this bug:
2879         // https://code.google.com/p/android/issues/detail?id=20493#c8
2880         // ActivityCompat.invalidateOptionsMenu(this);
2881     }
2882
2883     @Override
2884     public void onCreateContextMenu(ContextMenu menu, View view, ContextMenu.ContextMenuInfo menuInfo) {
2885         // Store the `HitTestResult`.
2886         final WebView.HitTestResult hitTestResult = mainWebView.getHitTestResult();
2887
2888         // Create strings.
2889         final String imageUrl;
2890         final String linkUrl;
2891
2892         // Get a handle for the `ClipboardManager`.
2893         final ClipboardManager clipboardManager = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
2894
2895         // Remove the lint errors below that `clipboardManager` might be `null`.
2896         assert clipboardManager != null;
2897
2898         switch (hitTestResult.getType()) {
2899             // `SRC_ANCHOR_TYPE` is a link.
2900             case WebView.HitTestResult.SRC_ANCHOR_TYPE:
2901                 // Get the target URL.