Change the default homepage to `https://start.duckduckgo.com`. Implements https...
[PrivacyBrowser.git] / app / src / main / java / com / stoutner / privacybrowser / activities / MainWebViewActivity.java
1 /*
2  * Copyright © 2015-2017 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.annotation.SuppressLint;
25 import android.app.DialogFragment;
26 import android.app.DownloadManager;
27 import android.content.BroadcastReceiver;
28 import android.content.ClipData;
29 import android.content.ClipboardManager;
30 import android.content.Context;
31 import android.content.Intent;
32 import android.content.IntentFilter;
33 import android.content.SharedPreferences;
34 import android.content.res.Configuration;
35 import android.database.Cursor;
36 import android.graphics.Bitmap;
37 import android.graphics.drawable.BitmapDrawable;
38 import android.graphics.drawable.Drawable;
39 import android.net.Uri;
40 import android.net.http.SslCertificate;
41 import android.net.http.SslError;
42 import android.os.Build;
43 import android.os.Bundle;
44 import android.preference.PreferenceManager;
45 import android.print.PrintDocumentAdapter;
46 import android.print.PrintManager;
47 import android.support.annotation.NonNull;
48 import android.support.design.widget.CoordinatorLayout;
49 import android.support.design.widget.NavigationView;
50 import android.support.design.widget.Snackbar;
51 import android.support.v4.app.ActivityCompat;
52 import android.support.v4.content.ContextCompat;
53 import android.support.v4.view.GravityCompat;
54 import android.support.v4.widget.DrawerLayout;
55 import android.support.v4.widget.SwipeRefreshLayout;
56 import android.support.v7.app.ActionBar;
57 import android.support.v7.app.ActionBarDrawerToggle;
58 import android.support.v7.app.AppCompatActivity;
59 import android.support.v7.app.AppCompatDialogFragment;
60 import android.support.v7.widget.Toolbar;
61 import android.text.Editable;
62 import android.text.TextWatcher;
63 import android.util.Patterns;
64 import android.view.ContextMenu;
65 import android.view.GestureDetector;
66 import android.view.KeyEvent;
67 import android.view.Menu;
68 import android.view.MenuItem;
69 import android.view.MotionEvent;
70 import android.view.View;
71 import android.view.WindowManager;
72 import android.view.inputmethod.InputMethodManager;
73 import android.webkit.CookieManager;
74 import android.webkit.DownloadListener;
75 import android.webkit.SslErrorHandler;
76 import android.webkit.WebBackForwardList;
77 import android.webkit.WebChromeClient;
78 import android.webkit.WebResourceResponse;
79 import android.webkit.WebStorage;
80 import android.webkit.WebView;
81 import android.webkit.WebViewClient;
82 import android.webkit.WebViewDatabase;
83 import android.widget.EditText;
84 import android.widget.FrameLayout;
85 import android.widget.ImageView;
86 import android.widget.LinearLayout;
87 import android.widget.ProgressBar;
88 import android.widget.RelativeLayout;
89 import android.widget.TextView;
90
91 import com.stoutner.privacybrowser.BannerAd;
92 import com.stoutner.privacybrowser.BuildConfig;
93 import com.stoutner.privacybrowser.R;
94 import com.stoutner.privacybrowser.dialogs.CreateHomeScreenShortcutDialog;
95 import com.stoutner.privacybrowser.dialogs.DownloadImageDialog;
96 import com.stoutner.privacybrowser.dialogs.UrlHistoryDialog;
97 import com.stoutner.privacybrowser.dialogs.ViewSslCertificateDialog;
98 import com.stoutner.privacybrowser.helpers.DomainsDatabaseHelper;
99 import com.stoutner.privacybrowser.helpers.OrbotProxyHelper;
100 import com.stoutner.privacybrowser.dialogs.DownloadFileDialog;
101 import com.stoutner.privacybrowser.dialogs.SslCertificateErrorDialog;
102
103 import java.io.BufferedReader;
104 import java.io.ByteArrayInputStream;
105 import java.io.IOException;
106 import java.io.InputStreamReader;
107 import java.io.UnsupportedEncodingException;
108 import java.net.MalformedURLException;
109 import java.net.URL;
110 import java.net.URLDecoder;
111 import java.net.URLEncoder;
112 import java.util.HashMap;
113 import java.util.HashSet;
114 import java.util.Map;
115 import java.util.Set;
116
117 // We need to use AppCompatActivity from android.support.v7.app.AppCompatActivity to have access to the SupportActionBar until the minimum API is >= 21.
118 public class MainWebViewActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, CreateHomeScreenShortcutDialog.CreateHomeScreenSchortcutListener,
119         SslCertificateErrorDialog.SslCertificateErrorListener, DownloadFileDialog.DownloadFileListener, DownloadImageDialog.DownloadImageListener, UrlHistoryDialog.UrlHistoryListener {
120
121     // `appBar` is public static so it can be accessed from `OrbotProxyHelper`.  It is also used in `onCreate()`, `onOptionsItemSelected()`, `closeFindOnPage()`, and `applyAppSettings()`.
122     public static ActionBar appBar;
123
124     // `favoriteIconBitmap` is public static so it can be accessed from `CreateHomeScreenShortcutDialog`, `BookmarksActivity`, `CreateBookmarkDialog`, `CreateBookmarkFolderDialog`, `EditBookmarkDialog`, `EditBookmarkFolderDialog`, `ViewSslCertificateDialog`.
125     // It is also used in `onCreate()`, `onCreateHomeScreenShortcutCreate()`, and `applyDomainSettings`.
126     public static Bitmap favoriteIconBitmap;
127
128     // `formattedUrlString` is public static so it can be accessed from `BookmarksActivity`, `CreateBookmarkDialog`, and `AddDomainDialog`.
129     // It is also used in `onCreate()`, `onOptionsItemSelected()`, `onNavigationItemSelected()`, `onCreateHomeScreenShortcutCreate()`, and `loadUrlFromTextBox()`.
130     public static String formattedUrlString;
131
132     // `sslCertificate` is public static so it can be accessed from `ViewSslCertificateDialog`.  It is also used in `onCreate()`.
133     public static SslCertificate sslCertificate;
134
135     // `orbotStatus` is public static so it can be accessed from `OrbotProxyHelper`.  It is also used in `onCreate()`.
136     public static String orbotStatus;
137
138     // `webViewTitle` is public static so it can be accessed from `CreateBookmarkDialog` and `CreateHomeScreenShortcutDialog`.  It is also used in `onCreate()`.
139     public static String webViewTitle;
140
141     // `displayWebpageImagesBoolean` is public static so it can be accessed from `DomainSettingsFragment`.  It is also used in `applyAppSettings()` and `applyDomainSettings()`.
142     public static boolean displayWebpageImagesBoolean;
143
144     // `reloadOnRestartBoolean` is public static so it can be accessed from `SettingsFragment`.  It is also used in `onRestart()`
145     public static boolean reloadOnRestartBoolean;
146
147
148     // `navigatingHistory` is used in `onCreate()`, `onNavigationItemSelected()`, and `applyDomainSettings()`.
149     private boolean navigatingHistory;
150
151     // `favoriteIconDefaultBitmap` is used in `onCreate()` and `applyDomainSettings`.
152     private Bitmap favoriteIconDefaultBitmap;
153
154     // `drawerLayout` is used in `onCreate()`, `onNewIntent()`, and `onBackPressed()`.
155     private DrawerLayout drawerLayout;
156
157     // `rootCoordinatorLayout` is used in `onCreate()` and `applyAppSettings()`.
158     private CoordinatorLayout rootCoordinatorLayout;
159
160     // `mainWebView` is used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, `onNavigationItemSelected()`, `onRestart()`, `onCreateContextMenu()`, `findPreviousOnPage()`, `findNextOnPage()`, `closeFindOnPage()`, `loadUrlFromTextBox()`
161     // and `setDisplayWebpageImages()`.
162     private WebView mainWebView;
163
164     // `fullScreenVideoFrameLayout` is used in `onCreate()` and `onConfigurationChanged()`.
165     private FrameLayout fullScreenVideoFrameLayout;
166
167     // `swipeRefreshLayout` is used in `onCreate()`, `onPrepareOptionsMenu`, and `onRestart()`.
168     private SwipeRefreshLayout swipeRefreshLayout;
169
170     // `urlAppBarRelativeLayout` is used in `onCreate()` and `applyDomainSettings()`.
171     private RelativeLayout urlAppBarRelativeLayout;
172
173     // `favoriteIconImageView` is used in `onCreate()` and `applyDomainSettings()`
174     private ImageView favoriteIconImageView;
175
176     // `cookieManager` is used in `onCreate()`, `onOptionsItemSelected()`, and `onNavigationItemSelected()`, `loadUrlFromTextBox()`, `onDownloadImage()`, `onDownloadFile()`, and `onRestart()`.
177     private CookieManager cookieManager;
178
179     // `customHeader` is used in `onCreate()`, `onOptionsItemSelected()`, `onCreateContextMenu()`, and `loadUrl()`.
180     private final Map<String, String> customHeaders = new HashMap<>();
181
182     // `javaScriptEnabled` is also used in `onCreate()`, `onCreateOptionsMenu()`, `onOptionsItemSelected()`, `loadUrlFromTextBox()`, and `applyAppSettings()`.
183     // It is `Boolean` instead of `boolean` because `applyAppSettings()` needs to know if it is `null`.
184     private Boolean javaScriptEnabled;
185
186     // `firstPartyCookiesEnabled` is used in `onCreate()`, `onCreateOptionsMenu()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, `onDownloadImage()`, `onDownloadFile()`, and `applyAppSettings()`.
187     private boolean firstPartyCookiesEnabled;
188
189     // `thirdPartyCookiesEnabled` used in `onCreate()`, `onCreateOptionsMenu()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, and `applyAppSettings()`.
190     private boolean thirdPartyCookiesEnabled;
191
192     // `domStorageEnabled` is used in `onCreate()`, `onCreateOptionsMenu()`, `onOptionsItemSelected()`, and `applyAppSettings()`.
193     private boolean domStorageEnabled;
194
195     // `saveFormDataEnabled` is used in `onCreate()`, `onCreateOptionsMenu()`, `onOptionsItemSelected()`, and `applyAppSettings()`.
196     private boolean saveFormDataEnabled;
197
198     // `swipeToRefreshEnabled` is used in `onPrepareOptionsMenu()` and `applyAppSettings()`.
199     private boolean swipeToRefreshEnabled;
200
201     // 'homepage' is used in `onCreate()`, `onNavigationItemSelected()`, and `applyAppSettings()`.
202     private String homepage;
203
204     // `searchURL` is used in `loadURLFromTextBox()` and `applyAppSettings()`.
205     private String searchURL;
206
207     // `adBlockerEnabled` is used in `onCreate()` and `applyAppSettings()`.
208     private boolean adBlockerEnabled;
209
210     // `privacyBrowserRuntime` is used in `onCreate()` and `applyAppSettings()`.
211     private Runtime privacyBrowserRuntime;
212
213     // `incognitoModeEnabled` is used in `onCreate()` and `applyAppSettings()`.
214     private boolean incognitoModeEnabled;
215
216     // `fullScreenBrowsingModeEnabled` is used in `onCreate()` and `applyAppSettings()`.
217     private boolean fullScreenBrowsingModeEnabled;
218
219     // `inFullScreenBrowsingMode` is used in `onCreate()`, `onConfigurationChanged()`, and `applyAppSettings()`.
220     private boolean inFullScreenBrowsingMode;
221
222     // `hideSystemBarsOnFullscreen` is used in `onCreate()` and `applyAppSettings()`.
223     private boolean hideSystemBarsOnFullscreen;
224
225     // `translucentNavigationBarOnFullscreen` is used in `onCreate()` and `applyAppSettings()`.
226     private boolean translucentNavigationBarOnFullscreen;
227
228     // `currentDomainName` is used in `onCreate()`, `onNavigationItemSelected()`, and `applyDomainSettings()`.
229     private String currentDomainName;
230
231     // `waitingForOrbot` is used in `onCreate()` and `applyAppSettings()`.
232     private boolean waitingForOrbot;
233
234     // `domainSettingsApplied` is used in `applyDomainSettings()` and `setDisplayWebpageImages()`.
235     private boolean domainSettingsApplied;
236
237     // `displayWebpageImagesInt` is used in `applyDomainSettings()` and `setDisplayWebpageImages()`.
238     private int displayWebpageImagesInt;
239
240     // `onTheFlyDisplayImagesSet` is used in `applyDomainSettings()` and `setDisplayWebpageImages()`.
241     private boolean onTheFlyDisplayImagesSet;
242
243     // `waitingForOrbotData` is used in `onCreate()` and `applyAppSettings()`.
244     private String waitingForOrbotHTMLString;
245
246     // `privateDataDirectoryString` is used in `onCreate()` and `onNavigationItemSelected()`.
247     private String privateDataDirectoryString;
248
249     // `findOnPageLinearLayout` is used in `onCreate()`, `onOptionsItemSelected()`, and `closeFindOnPage()`.
250     private LinearLayout findOnPageLinearLayout;
251
252     // `findOnPageEditText` is used in `onCreate()`, `onOptionsItemSelected()`, and `closeFindOnPage()`.
253     private EditText findOnPageEditText;
254
255     // `mainMenu` is used in `onCreateOptionsMenu()` and `updatePrivacyIcons()`.
256     private Menu mainMenu;
257
258     // `drawerToggle` is used in `onCreate()`, `onPostCreate()`, `onConfigurationChanged()`, `onNewIntent()`, and `onNavigationItemSelected()`.
259     private ActionBarDrawerToggle drawerToggle;
260
261     // `supportAppBar` is used in `onCreate()`, `onOptionsItemSelected()`, and `closeFindOnPage()`.
262     private Toolbar supportAppBar;
263
264     // `urlTextBox` is used in `onCreate()`, `onOptionsItemSelected()`, `loadUrlFromTextBox()`, and `loadUrl()`.
265     private EditText urlTextBox;
266
267     // `adView` is used in `onCreate()` and `onConfigurationChanged()`.
268     private View adView;
269
270     // `sslErrorHandler` is used in `onCreate()`, `onSslErrorCancel()`, and `onSslErrorProceed`.
271     private SslErrorHandler sslErrorHandler;
272
273     // `inputMethodManager` is used in `onOptionsItemSelected()`, `loadUrlFromTextBox()`, and `closeFindOnPage()`.
274     private InputMethodManager inputMethodManager;
275
276     // `mainWebViewRelativeLayout` is used in `onCreate()` and `onNavigationItemSelected()`.
277     private RelativeLayout mainWebViewRelativeLayout;
278
279     @Override
280     // 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.
281     @SuppressLint("SetJavaScriptEnabled")
282     protected void onCreate(Bundle savedInstanceState) {
283         super.onCreate(savedInstanceState);
284         setContentView(R.layout.main_drawerlayout);
285
286         // Get a handle for `inputMethodManager`.
287         inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
288
289         // We need to use the `SupportActionBar` from `android.support.v7.app.ActionBar` until the minimum API is >= 21.
290         supportAppBar = (Toolbar) findViewById(R.id.app_bar);
291         setSupportActionBar(supportAppBar);
292         appBar = getSupportActionBar();
293
294         // This is needed to get rid of the Android Studio warning that `appBar` might be null.
295         assert appBar != null;
296
297         // Add the custom `url_app_bar` layout, which shows the favorite icon and the URL text bar.
298         appBar.setCustomView(R.layout.url_app_bar);
299         appBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
300
301         // Set the "go" button on the keyboard to load the URL in urlTextBox.
302         urlTextBox = (EditText) appBar.getCustomView().findViewById(R.id.url_edittext);
303         urlTextBox.setOnKeyListener(new View.OnKeyListener() {
304             @Override
305             public boolean onKey(View v, int keyCode, KeyEvent event) {
306                 // If the event is a key-down event on the `enter` button, load the URL.
307                 if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {
308                     // Load the URL into the mainWebView and consume the event.
309                     try {
310                         loadUrlFromTextBox();
311                     } catch (UnsupportedEncodingException e) {
312                         e.printStackTrace();
313                     }
314                     // If the enter key was pressed, consume the event.
315                     return true;
316                 } else {
317                     // If any other key was pressed, do not consume the event.
318                     return false;
319                 }
320             }
321         });
322
323         // Set `waitingForOrbotHTMLString`.
324         waitingForOrbotHTMLString = "<html><body><br/><center><h1>" + getString(R.string.waiting_for_orbot) + "</h1></center></body></html>";
325
326         // Initialize `currentDomainName`, `orbotStatus`, and `waitingForOrbot`.
327         currentDomainName = "";
328         orbotStatus = "unknown";
329         waitingForOrbot = false;
330
331         // Create an Orbot status `BroadcastReceiver`.
332         BroadcastReceiver orbotStatusBroadcastReceiver = new BroadcastReceiver() {
333             @Override
334             public void onReceive(Context context, Intent intent) {
335                 // Store the content of the status message in `orbotStatus`.
336                 orbotStatus = intent.getStringExtra("org.torproject.android.intent.extra.STATUS");
337
338                 // If we are waiting on Orbot, load the website now that Orbot is connected.
339                 if (orbotStatus.equals("ON") && waitingForOrbot) {
340                     // Reset `waitingForOrbot`.
341                     waitingForOrbot = false;
342
343                     // Load `formattedUrlString
344                     loadUrl(formattedUrlString);
345                 }
346             }
347         };
348
349         // Register `orbotStatusBroadcastReceiver` on `this` context.
350         this.registerReceiver(orbotStatusBroadcastReceiver, new IntentFilter("org.torproject.android.intent.action.STATUS"));
351
352         // Get handles for views that need to be accessed.
353         drawerLayout = (DrawerLayout) findViewById(R.id.drawerlayout);
354         rootCoordinatorLayout = (CoordinatorLayout) findViewById(R.id.root_coordinatorlayout);
355         mainWebViewRelativeLayout = (RelativeLayout) findViewById(R.id.main_webview_relativelayout);
356         mainWebView = (WebView) findViewById(R.id.main_webview);
357         findOnPageLinearLayout = (LinearLayout) findViewById(R.id.find_on_page_linearlayout);
358         findOnPageEditText = (EditText) findViewById(R.id.find_on_page_edittext);
359         fullScreenVideoFrameLayout = (FrameLayout) findViewById(R.id.full_screen_video_framelayout);
360         urlAppBarRelativeLayout = (RelativeLayout) findViewById(R.id.url_app_bar_relativelayout);
361         favoriteIconImageView = (ImageView) findViewById(R.id.favorite_icon);
362
363         // Create a double-tap listener to toggle full-screen mode.
364         final GestureDetector gestureDetector = new GestureDetector(this, new GestureDetector.SimpleOnGestureListener() {
365             // Override `onDoubleTap()`.  All other events are handled using the default settings.
366             @Override
367             public boolean onDoubleTap(MotionEvent event) {
368                 if (fullScreenBrowsingModeEnabled) {  // Only process the double-tap if full screen browsing mode is enabled.
369                     // Toggle `inFullScreenBrowsingMode`.
370                     inFullScreenBrowsingMode = !inFullScreenBrowsingMode;
371
372                     if (inFullScreenBrowsingMode) {  // Switch to full screen mode.
373                         // Hide the `appBar`.
374                         appBar.hide();
375
376                         // Hide the `BannerAd` in the free flavor.
377                         if (BuildConfig.FLAVOR.contentEquals("free")) {
378                             BannerAd.hideAd(adView);
379                         }
380
381                         // Modify the system bars.
382                         if (hideSystemBarsOnFullscreen) {  // Hide everything.
383                             // Remove the translucent overlays.
384                             getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
385
386                             // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
387                             drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
388
389                             /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
390                              * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
391                              * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically rehides them after they are shown.
392                              */
393                             rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
394
395                             // Set `rootCoordinatorLayout` to fill the whole screen.
396                             rootCoordinatorLayout.setFitsSystemWindows(false);
397                         } else {  // Hide everything except the status and navigation bars.
398                             // Set `rootCoordinatorLayout` to fit under the status and navigation bars.
399                             rootCoordinatorLayout.setFitsSystemWindows(false);
400
401                             if (translucentNavigationBarOnFullscreen) {  // 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.
402                                 // Set the navigation bar to be translucent.
403                                 getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
404                             }
405                         }
406                     } else {  // Switch to normal viewing mode.
407                         // Show the `appBar`.
408                         appBar.show();
409
410                         // Show the `BannerAd` in the free flavor.
411                         if (BuildConfig.FLAVOR.contentEquals("free")) {
412                             // Reload the ad.  Because the screen may have rotated, we need to use `reloadAfterRotate`.
413                             BannerAd.reloadAfterRotate(adView, getApplicationContext(), getString(R.string.ad_id));
414
415                             // Reinitialize the `adView` variable, as the `View` will have been removed and re-added by `BannerAd.reloadAfterRotate()`.
416                             adView = findViewById(R.id.adview);
417                         }
418
419                         // Remove the translucent navigation bar flag if it is set.
420                         getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
421
422                         // Add the translucent status flag if it is unset.  This also resets `drawerLayout's` `View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN`.
423                         getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
424
425                         // Remove any `SYSTEM_UI` flags from `rootCoordinatorLayout`.
426                         rootCoordinatorLayout.setSystemUiVisibility(0);
427
428                         // Constrain `rootCoordinatorLayout` inside the status and navigation bars.
429                         rootCoordinatorLayout.setFitsSystemWindows(true);
430                     }
431
432                     // Consume the double-tap.
433                     return true;
434                 } else { // Do not consume the double-tap because full screen browsing mode is disabled.
435                     return false;
436                 }
437             }
438         });
439
440         // Pass all touch events on `mainWebView` through `gestureDetector` to check for double-taps.
441         mainWebView.setOnTouchListener(new View.OnTouchListener() {
442             @Override
443             public boolean onTouch(View v, MotionEvent event) {
444                 // Send the `event` to `gestureDetector`.
445                 return gestureDetector.onTouchEvent(event);
446             }
447         });
448
449         // Update `findOnPageCountTextView`.
450         mainWebView.setFindListener(new WebView.FindListener() {
451             // Get a handle for `findOnPageCountTextView`.
452             final TextView findOnPageCountTextView = (TextView) findViewById(R.id.find_on_page_count_textview);
453
454             @Override
455             public void onFindResultReceived(int activeMatchOrdinal, int numberOfMatches, boolean isDoneCounting) {
456                 if ((isDoneCounting) && (numberOfMatches == 0)) {  // There are no matches.
457                     // Set `findOnPageCountTextView` to `0/0`.
458                     findOnPageCountTextView.setText(R.string.zero_of_zero);
459                 } else if (isDoneCounting) {  // There are matches.
460                     // `activeMatchOrdinal` is zero-based.
461                     int activeMatch = activeMatchOrdinal + 1;
462
463                     // Set `findOnPageCountTextView`.
464                     findOnPageCountTextView.setText(activeMatch + "/" + numberOfMatches);
465                 }
466             }
467         });
468
469         // Search for the string on the page whenever a character changes in the `findOnPageEditText`.
470         findOnPageEditText.addTextChangedListener(new TextWatcher() {
471             @Override
472             public void beforeTextChanged(CharSequence s, int start, int count, int after) {
473                 // Do nothing.
474             }
475
476             @Override
477             public void onTextChanged(CharSequence s, int start, int before, int count) {
478                 // Do nothing.
479             }
480
481             @Override
482             public void afterTextChanged(Editable s) {
483                 // Search for the text in `mainWebView`.
484                 mainWebView.findAllAsync(findOnPageEditText.getText().toString());
485             }
486         });
487
488         // Set the `check mark` button for the `findOnPageEditText` keyboard to close the soft keyboard.
489         findOnPageEditText.setOnKeyListener(new View.OnKeyListener() {
490             @Override
491             public boolean onKey(View v, int keyCode, KeyEvent event) {
492                 if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {  // The `enter` key was pressed.
493                     // Hide the soft keyboard.  `0` indicates no additional flags.
494                     inputMethodManager.hideSoftInputFromWindow(mainWebView.getWindowToken(), 0);
495
496                     // Consume the event.
497                     return true;
498                 } else {  // A different key was pressed.
499                     // Do not consume the event.
500                     return false;
501                 }
502             }
503         });
504
505         // Implement swipe to refresh
506         swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_refreshlayout);
507         swipeRefreshLayout.setColorSchemeResources(R.color.blue_700);
508         swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
509             @Override
510             public void onRefresh() {
511                 mainWebView.reload();
512             }
513         });
514
515         // `DrawerTitle` identifies the `DrawerLayout` in accessibility mode.
516         drawerLayout.setDrawerTitle(GravityCompat.START, getString(R.string.navigation_drawer));
517
518         // Listen for touches on the navigation menu.
519         final NavigationView navigationView = (NavigationView) findViewById(R.id.navigationview);
520         navigationView.setNavigationItemSelectedListener(this);
521
522         // 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.
523         final Menu navigationMenu = navigationView.getMenu();
524         final MenuItem navigationBackMenuItem = navigationMenu.getItem(1);
525         final MenuItem navigationForwardMenuItem = navigationMenu.getItem(2);
526         final MenuItem navigationHistoryMenuItem = navigationMenu.getItem(3);
527
528         // The `DrawerListener` allows us to update the Navigation Menu.
529         drawerLayout.addDrawerListener(new DrawerLayout.DrawerListener() {
530             @Override
531             public void onDrawerSlide(View drawerView, float slideOffset) {
532             }
533
534             @Override
535             public void onDrawerOpened(View drawerView) {
536             }
537
538             @Override
539             public void onDrawerClosed(View drawerView) {
540             }
541
542             @Override
543             public void onDrawerStateChanged(int newState) {
544                 if ((newState == DrawerLayout.STATE_SETTLING) || (newState == DrawerLayout.STATE_DRAGGING)) {  // The drawer is opening or closing.
545                     // Update the `Back`, `Forward`, and `History` menu items.
546                     navigationBackMenuItem.setEnabled(mainWebView.canGoBack());
547                     navigationForwardMenuItem.setEnabled(mainWebView.canGoForward());
548                     navigationHistoryMenuItem.setEnabled((mainWebView.canGoBack() || mainWebView.canGoForward()));
549
550                     // Hide the keyboard so we can see the navigation menu.  `0` indicates no additional flags.
551                     inputMethodManager.hideSoftInputFromWindow(mainWebView.getWindowToken(), 0);
552                 }
553             }
554         });
555
556         // drawerToggle creates the hamburger icon at the start of the AppBar.
557         drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, supportAppBar, R.string.open_navigation_drawer, R.string.close_navigation_drawer);
558
559         // Initialize `adServerSet`.
560         final Set<String> adServersSet = new HashSet<>();
561
562         // Load the list of ad servers into memory.
563         try {
564             // Load `pgl.yoyo.org_adservers.txt` into a `BufferedReader`.
565             BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(getAssets().open("pgl.yoyo.org_adservers.txt")));
566
567             // Create a string for storing each ad server.
568             String adServer;
569
570             // Populate `adServersSet`.
571             while ((adServer = bufferedReader.readLine()) != null) {
572                 adServersSet.add(adServer);
573             }
574
575             // Close `bufferedReader`.
576             bufferedReader.close();
577         } catch (IOException ioException) {
578             // We're pretty sure the asset exists, so we don't need to worry about the `IOException` ever being thrown.
579         }
580
581         mainWebView.setWebViewClient(new WebViewClient() {
582             // `shouldOverrideUrlLoading` makes this `WebView` the default handler for URLs inside the app, so that links are not kicked out to other apps.
583             // We have to use the deprecated `shouldOverrideUrlLoading` until API >= 24.
584             @SuppressWarnings("deprecation")
585             @Override
586             public boolean shouldOverrideUrlLoading(WebView view, String url) {
587                 if (url.startsWith("mailto:")) {  // Load the URL in an external email program because it begins with `mailto:`.
588                     // We use `ACTION_SENDTO` instead of `ACTION_SEND` so that only email programs are launched.
589                     Intent emailIntent = new Intent(Intent.ACTION_SENDTO);
590
591                     // Parse the url and set it as the data for the `Intent`.
592                     emailIntent.setData(Uri.parse(url));
593
594                     // `FLAG_ACTIVITY_NEW_TASK` opens the email program in a new task instead as part of Privacy Browser.
595                     emailIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
596
597                     // Make it so.
598                     startActivity(emailIntent);
599
600                     // Returning `true` indicates the application is handling the URL.
601                     return true;
602                 } else {  // Load the URL in Privacy Browser.
603                     // Apply the domain settings for the new URL.
604                     applyDomainSettings(url);
605
606                     // Returning `false` causes the current `WebView` to handle the URL and prevents it from adding redirects to the history list.
607                     return false;
608                 }
609             }
610
611             // Block ads.  We have to use the deprecated `shouldInterceptRequest` until minimum API >= 21.
612             @SuppressWarnings("deprecation")
613             @Override
614             public WebResourceResponse shouldInterceptRequest(WebView view, String url){
615                 if (adBlockerEnabled) {  // Block ads.
616                     // Extract the host from `url`.
617                     Uri requestUri = Uri.parse(url);
618                     String requestHost = requestUri.getHost();
619
620                     // Initialize a variable to track if this is an ad server.
621                     boolean requestHostIsAdServer = false;
622
623                     // Check all the subdomains of `requestHost` if it is not `null` against the ad server database.
624                     if (requestHost != null) {
625                         while (requestHost.contains(".") && !requestHostIsAdServer) {  // Stop checking if we run out of `.` or if we already know that `requestHostIsAdServer` is `true`.
626                             if (adServersSet.contains(requestHost)) {
627                                 requestHostIsAdServer = true;
628                             }
629
630                             // Strip out the lowest subdomain of `requestHost`.
631                             requestHost = requestHost.substring(requestHost.indexOf(".") + 1);
632                         }
633                     }
634
635                     if (requestHostIsAdServer) {  // It is an ad server.
636                         // Return an empty `WebResourceResponse`.
637                         return new WebResourceResponse("text/plain", "utf8", new ByteArrayInputStream("".getBytes()));
638                     } else {  // It is not an ad server.
639                         // `return null` loads the requested resource.
640                         return null;
641                     }
642                 } else {  // Ad blocking is disabled.
643                     // `return null` loads the requested resource.
644                     return null;
645                 }
646             }
647
648             // Update the URL in urlTextBox when the page starts to load.
649             @Override
650             public void onPageStarted(WebView view, String url, Bitmap favicon) {
651                 // Reset `webViewTitle`
652                 webViewTitle = getString(R.string.no_title);
653
654                 // Check to see if we are waiting on Orbot.
655                 if (!waitingForOrbot) {  // We are not waiting on Orbot, so we need to process the URL.
656                     // 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.
657                     formattedUrlString = url;
658
659                     // Display the loading URL is the URL text box.
660                     urlTextBox.setText(url);
661
662                     // Apply any custom domain settings if the URL was loaded by navigating history.
663                     if (navigatingHistory) {
664                         applyDomainSettings(url);
665                     }
666                 }
667             }
668
669             // Update formattedUrlString and urlTextBox.  It is necessary to do this after the page finishes loading because the final URL can change during load.
670             @Override
671             public void onPageFinished(WebView view, String url) {
672                 // Clear the cache and history if Incognito Mode is enabled.
673                 if (incognitoModeEnabled) {
674                     // Clear the cache.  `true` includes disk files.
675                     mainWebView.clearCache(true);
676
677                     // Clear the back/forward history.
678                     mainWebView.clearHistory();
679
680                     // Manually delete cache folders.
681                     try {
682                         // Delete the main `cache` folder.
683                         privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/cache");
684
685                         // Delete the `app_webview` folder, which contains an additional `WebView` cache.  See `https://code.google.com/p/android/issues/detail?id=233826&thanks=233826&ts=1486670530`.
686                         privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/app_webview");
687                     } catch (IOException e) {
688                         // Do nothing if an error is thrown.
689                     }
690                 }
691
692                 // Update `urlTextBox` and apply domain settings if not waiting on Orbot.
693                 if (!waitingForOrbot) {
694                     // Check to see if `WebView` has set `url` to be `about:blank`.
695                     if (url.equals("about:blank")) {  // `WebView` is blank, so `formattedUrlString` should be `""` and `urlTextBox` should display a hint.
696                         // Set `formattedUrlString` to `""`.
697                         formattedUrlString = "";
698
699                         // Update `urlTextBox`.
700                         urlTextBox.setText(formattedUrlString);
701
702                         // Request focus for `urlTextBox`.
703                         urlTextBox.requestFocus();
704
705                         // Display the keyboard.
706                         inputMethodManager.showSoftInput(urlTextBox, 0);
707
708                         // Apply the domain settings.
709                         applyDomainSettings(formattedUrlString);
710                     } else {  // `WebView` has loaded a webpage.
711                         // Set `formattedUrlString`.
712                         formattedUrlString = url;
713
714                         // Only update `urlTextBox` if the user is not typing in it.
715                         if (!urlTextBox.hasFocus()) {
716                             urlTextBox.setText(formattedUrlString);
717                         }
718                     }
719
720                     // Store the SSL certificate so it can be accessed from `ViewSslCertificateDialog`.
721                     sslCertificate = mainWebView.getCertificate();
722                 }
723             }
724
725             // Handle SSL Certificate errors.
726             @Override
727             public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
728                 // Store `handler` so it can be accesses from `onSslErrorCancel()` and `onSslErrorProceed()`.
729                 sslErrorHandler = handler;
730
731                 // Display the SSL error `AlertDialog`.
732                 AppCompatDialogFragment sslCertificateErrorDialogFragment = SslCertificateErrorDialog.displayDialog(error);
733                 sslCertificateErrorDialogFragment.show(getSupportFragmentManager(), getResources().getString(R.string.ssl_certificate_error));
734             }
735         });
736
737         // Get a handle for the progress bar.
738         final ProgressBar progressBar = (ProgressBar) findViewById(R.id.progress_bar);
739
740         mainWebView.setWebChromeClient(new WebChromeClient() {
741             // Update the progress bar when a page is loading.
742             @Override
743             public void onProgressChanged(WebView view, int progress) {
744                 progressBar.setProgress(progress);
745                 if (progress < 100) {
746                     progressBar.setVisibility(View.VISIBLE);
747                 } else {
748                     progressBar.setVisibility(View.GONE);
749
750                     //Stop the `SwipeToRefresh` indicator if it is running
751                     swipeRefreshLayout.setRefreshing(false);
752                 }
753             }
754
755             // Set the favorite icon when it changes.
756             @Override
757             public void onReceivedIcon(WebView view, Bitmap icon) {
758                 // Only update the favorite icon if the website has finished loading.
759                 if (progressBar.getVisibility() == View.GONE) {
760                     // Save a copy of the favorite icon.
761                     favoriteIconBitmap = icon;
762
763                     // Place the favorite icon in the appBar.
764                     favoriteIconImageView.setImageBitmap(Bitmap.createScaledBitmap(icon, 64, 64, true));
765                 }
766             }
767
768             // Save a copy of the title when it changes.
769             @Override
770             public void onReceivedTitle(WebView view, String title) {
771                 // Save a copy of the title.
772                 webViewTitle = title;
773             }
774
775             // Enter full screen video
776             @Override
777             public void onShowCustomView(View view, CustomViewCallback callback) {
778                 // Pause the ad if this is the free flavor.
779                 if (BuildConfig.FLAVOR.contentEquals("free")) {
780                     BannerAd.pauseAd(adView);
781                 }
782
783                 // Remove the translucent overlays.
784                 getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
785
786                 // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
787                 drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
788
789                 /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
790                  * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
791                  * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically rehides them after they are shown.
792                  */
793                 rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
794
795                 // Set `rootCoordinatorLayout` to fill the entire screen.
796                 rootCoordinatorLayout.setFitsSystemWindows(false);
797
798                 // Add `view` to `fullScreenVideoFrameLayout` and display it on the screen.
799                 fullScreenVideoFrameLayout.addView(view);
800                 fullScreenVideoFrameLayout.setVisibility(View.VISIBLE);
801             }
802
803             // Exit full screen video
804             public void onHideCustomView() {
805                 // Hide `fullScreenVideoFrameLayout`.
806                 fullScreenVideoFrameLayout.removeAllViews();
807                 fullScreenVideoFrameLayout.setVisibility(View.GONE);
808
809                 // Add the translucent status flag.  This also resets `drawerLayout's` `View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN`.
810                 getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
811
812                 // Set `rootCoordinatorLayout` to fit inside the status and navigation bars.  This also clears the `SYSTEM_UI` flags.
813                 rootCoordinatorLayout.setFitsSystemWindows(true);
814
815                 // Show the ad if this is the free flavor.
816                 if (BuildConfig.FLAVOR.contentEquals("free")) {
817                     // Reload the ad.  Because the screen may have rotated, we need to use `reloadAfterRotate`.
818                     BannerAd.reloadAfterRotate(adView, getApplicationContext(), getString(R.string.ad_id));
819
820                     // Reinitialize the `adView` variable, as the `View` will have been removed and re-added by `BannerAd.reloadAfterRotate()`.
821                     adView = findViewById(R.id.adview);
822                 }
823             }
824         });
825
826         // Register `mainWebView` for a context menu.  This is used to see link targets and download images.
827         registerForContextMenu(mainWebView);
828
829         // Allow the downloading of files.
830         mainWebView.setDownloadListener(new DownloadListener() {
831             @Override
832             public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {
833                 // Show the `DownloadFileDialog` `AlertDialog` and name this instance `@string/download`.
834                 AppCompatDialogFragment downloadFileDialogFragment = DownloadFileDialog.fromUrl(url, contentDisposition, contentLength);
835                 downloadFileDialogFragment.show(getSupportFragmentManager(), getResources().getString(R.string.download));
836             }
837         });
838
839         // Allow pinch to zoom.
840         mainWebView.getSettings().setBuiltInZoomControls(true);
841
842         // Hide zoom controls.
843         mainWebView.getSettings().setDisplayZoomControls(false);
844
845         // Set `mainWebView` to use a wide viewport.  Otherwise, some web pages will be scrunched and some content will render outside the screen.
846         mainWebView.getSettings().setUseWideViewPort(true);
847
848         // Set `mainWebView` to load in overview mode (zoomed out to the maximum width).
849         mainWebView.getSettings().setLoadWithOverviewMode(true);
850
851         // Initialize cookieManager.
852         cookieManager = CookieManager.getInstance();
853
854         // 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).
855         customHeaders.put("X-Requested-With", "");
856
857         // Initialize the default preference values the first time the program is run.  `this` is the context.  `false` keeps this command from resetting any current preferences back to default.
858         PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
859
860         // Get the intent that started the app.
861         final Intent launchingIntent = getIntent();
862
863         // Extract the launching intent data as `launchingIntentUriData`.
864         final Uri launchingIntentUriData = launchingIntent.getData();
865
866         // Convert the launching intent URI data (if it exists) to a string and store it in `formattedUrlString`.
867         if (launchingIntentUriData != null) {
868             formattedUrlString = launchingIntentUriData.toString();
869         }
870
871         // Get a handle for the `Runtime`.
872         privacyBrowserRuntime = Runtime.getRuntime();
873
874         // Store the application's private data directory.
875         privateDataDirectoryString = getApplicationInfo().dataDir;  // `dataDir` will vary, but will be something like `/data/user/0/com.stoutner.privacybrowser.standard`, which links to `/data/data/com.stoutner.privacybrowser.standard`.
876
877         // Initialize `inFullScreenBrowsingMode`, which is always false at this point because Privacy Browser never starts in full screen browsing mode.
878         inFullScreenBrowsingMode = false;
879
880         // Initialize AdView for the free flavor.
881         adView = findViewById(R.id.adview);
882
883         // Initialize the privacy settings variables.
884         javaScriptEnabled = false;
885         firstPartyCookiesEnabled = false;
886         thirdPartyCookiesEnabled = false;
887         domStorageEnabled = false;
888         saveFormDataEnabled = false;
889
890         // Initialize `webViewTitle`.
891         webViewTitle = getString(R.string.no_title);
892
893         // Initialize `favoriteIconBitmap`.  We have to use `ContextCompat` until API >= 21.
894         Drawable favoriteIconDrawable = ContextCompat.getDrawable(getApplicationContext(), R.drawable.world);
895         BitmapDrawable favoriteIconBitmapDrawable = (BitmapDrawable) favoriteIconDrawable;
896         favoriteIconDefaultBitmap = favoriteIconBitmapDrawable.getBitmap();
897
898         // If the favorite icon is null, load the default.
899         if (favoriteIconBitmap == null) {
900             favoriteIconBitmap = favoriteIconDefaultBitmap;
901         }
902
903         // Apply the app settings from the shared preferences.
904         applyAppSettings();
905
906         // Load `formattedUrlString` if we are not waiting for Orbot to connect.
907         if (!waitingForOrbot) {
908             loadUrl(formattedUrlString);
909         }
910     }
911
912     @Override
913     protected void onNewIntent(Intent intent) {
914         // Sets the new intent as the activity intent, so that any future `getIntent()`s pick up this one instead of creating a new activity.
915         setIntent(intent);
916
917         if (intent.getData() != null) {
918             // Get the intent data and convert it to a string.
919             final Uri intentUriData = intent.getData();
920             formattedUrlString = intentUriData.toString();
921         }
922
923         // Close the navigation drawer if it is open.
924         if (drawerLayout.isDrawerVisible(GravityCompat.START)) {
925             drawerLayout.closeDrawer(GravityCompat.START);
926         }
927
928         // Load the website.
929         loadUrl(formattedUrlString);
930
931         // Clear the keyboard if displayed and remove the focus on the urlTextBar if it has it.
932         mainWebView.requestFocus();
933     }
934
935     @Override
936     public void onRestart() {
937         super.onRestart();
938
939         // Apply the app settings, which may have been changed in `SettingsActivity`.
940         applyAppSettings();
941
942         // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
943         updatePrivacyIcons(true);
944
945         // Set the display webpage images mode.
946         setDisplayWebpageImages();
947
948         // Reload the webpage if displaying of images has been disabled in `SettingsFragment`.
949         if (reloadOnRestartBoolean) {
950             // Reload `mainWebView`.
951             mainWebView.reload();
952
953             // Reset `reloadOnRestartBoolean`.
954             reloadOnRestartBoolean = false;
955         }
956     }
957
958     // `onResume()` runs after `onStart()`, which runs after `onCreate()` and `onRestart()`.
959     @Override
960     public void onResume() {
961         super.onResume();
962
963         // Resume JavaScript (if enabled).
964         mainWebView.resumeTimers();
965
966         // Resume `mainWebView`.
967         mainWebView.onResume();
968
969         // Resume the adView for the free flavor.
970         if (BuildConfig.FLAVOR.contentEquals("free")) {
971             BannerAd.resumeAd(adView);
972         }
973     }
974
975     @Override
976     public void onPause() {
977         // Pause `mainWebView`.
978         mainWebView.onPause();
979
980         // Stop all JavaScript.
981         mainWebView.pauseTimers();
982
983         // Pause the adView or it will continue to consume resources in the background on the free flavor.
984         if (BuildConfig.FLAVOR.contentEquals("free")) {
985             BannerAd.pauseAd(adView);
986         }
987
988         super.onPause();
989     }
990
991     @Override
992     public boolean onCreateOptionsMenu(Menu menu) {
993         // Inflate the menu; this adds items to the action bar if it is present.
994         getMenuInflater().inflate(R.menu.webview_options_menu, menu);
995
996         // Set mainMenu so it can be used by `onOptionsItemSelected()` and `updatePrivacyIcons`.
997         mainMenu = menu;
998
999         // Set the initial status of the privacy icons.  `false` does not call `invalidateOptionsMenu` as the last step.
1000         updatePrivacyIcons(false);
1001
1002         // Get handles for the menu items.
1003         MenuItem toggleFirstPartyCookiesMenuItem = menu.findItem(R.id.toggle_first_party_cookies);
1004         MenuItem toggleThirdPartyCookiesMenuItem = menu.findItem(R.id.toggle_third_party_cookies);
1005         MenuItem toggleDomStorageMenuItem = menu.findItem(R.id.toggle_dom_storage);
1006         MenuItem toggleSaveFormDataMenuItem = menu.findItem(R.id.toggle_save_form_data);
1007
1008         // Only display third-party cookies if SDK >= 21
1009         toggleThirdPartyCookiesMenuItem.setVisible(Build.VERSION.SDK_INT >= 21);
1010
1011         // Get the shared preference values.  `this` references the current context.
1012         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
1013
1014         // Set the status of the additional app bar icons.  The default is `false`.
1015         if (sharedPreferences.getBoolean("display_additional_app_bar_icons", false)) {
1016             toggleFirstPartyCookiesMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
1017             toggleDomStorageMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
1018             toggleSaveFormDataMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
1019         } else { //Do not display the additional icons.
1020             toggleFirstPartyCookiesMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
1021             toggleDomStorageMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
1022             toggleSaveFormDataMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
1023         }
1024
1025         return true;
1026     }
1027
1028     @Override
1029     public boolean onPrepareOptionsMenu(Menu menu) {
1030         // Get handles for the menu items.
1031         MenuItem toggleFirstPartyCookiesMenuItem = menu.findItem(R.id.toggle_first_party_cookies);
1032         MenuItem toggleThirdPartyCookiesMenuItem = menu.findItem(R.id.toggle_third_party_cookies);
1033         MenuItem toggleDomStorageMenuItem = menu.findItem(R.id.toggle_dom_storage);
1034         MenuItem toggleSaveFormDataMenuItem = menu.findItem(R.id.toggle_save_form_data);
1035         MenuItem clearCookiesMenuItem = menu.findItem(R.id.clear_cookies);
1036         MenuItem clearFormDataMenuItem = menu.findItem(R.id.clear_form_data);
1037         MenuItem fontSizeMenuItem = menu.findItem(R.id.font_size);
1038         MenuItem displayImagesMenuItem = menu.findItem(R.id.display_images);
1039         MenuItem refreshMenuItem = menu.findItem(R.id.refresh);
1040
1041         // Set the status of the menu item checkboxes.
1042         toggleFirstPartyCookiesMenuItem.setChecked(firstPartyCookiesEnabled);
1043         toggleThirdPartyCookiesMenuItem.setChecked(thirdPartyCookiesEnabled);
1044         toggleDomStorageMenuItem.setChecked(domStorageEnabled);
1045         toggleSaveFormDataMenuItem.setChecked(saveFormDataEnabled);
1046         displayImagesMenuItem.setChecked(mainWebView.getSettings().getLoadsImagesAutomatically());
1047
1048         // Enable third-party cookies if first-party cookies are enabled.
1049         toggleThirdPartyCookiesMenuItem.setEnabled(firstPartyCookiesEnabled);
1050
1051         // Enable DOM Storage if JavaScript is enabled.
1052         toggleDomStorageMenuItem.setEnabled(javaScriptEnabled);
1053
1054         // Enable Clear Cookies if there are any.
1055         clearCookiesMenuItem.setEnabled(cookieManager.hasCookies());
1056
1057         // Enable Clear Form Data is there is any.
1058         WebViewDatabase mainWebViewDatabase = WebViewDatabase.getInstance(this);
1059         clearFormDataMenuItem.setEnabled(mainWebViewDatabase.hasFormData());
1060
1061         // Initialize font size variables.
1062         int fontSize = mainWebView.getSettings().getTextZoom();
1063         String fontSizeTitle;
1064         MenuItem selectedFontSizeMenuItem;
1065
1066         // Prepare the font size title and current size menu item.
1067         switch (fontSize) {
1068             case 25:
1069                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.twenty_five_percent);
1070                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_twenty_five_percent);
1071                 break;
1072
1073             case 50:
1074                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.fifty_percent);
1075                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_fifty_percent);
1076                 break;
1077
1078             case 75:
1079                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.seventy_five_percent);
1080                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_seventy_five_percent);
1081                 break;
1082
1083             case 100:
1084                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.one_hundred_percent);
1085                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_percent);
1086                 break;
1087
1088             case 125:
1089                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.one_hundred_twenty_five_percent);
1090                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_twenty_five_percent);
1091                 break;
1092
1093             case 150:
1094                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.one_hundred_fifty_percent);
1095                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_fifty_percent);
1096                 break;
1097
1098             case 175:
1099                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.one_hundred_seventy_five_percent);
1100                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_seventy_five_percent);
1101                 break;
1102
1103             case 200:
1104                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.two_hundred_percent);
1105                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_two_hundred_percent);
1106                 break;
1107
1108             default:
1109                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.one_hundred_percent);
1110                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_percent);
1111                 break;
1112         }
1113
1114         // Set the font size title and select the current size menu item.
1115         fontSizeMenuItem.setTitle(fontSizeTitle);
1116         selectedFontSizeMenuItem.setChecked(true);
1117
1118         // Only show `Refresh` if `swipeToRefresh` is disabled.
1119         refreshMenuItem.setVisible(!swipeToRefreshEnabled);
1120
1121         // Run all the other default commands.
1122         super.onPrepareOptionsMenu(menu);
1123
1124         // `return true` displays the menu.
1125         return true;
1126     }
1127
1128     @Override
1129     // Remove Android Studio's warning about the dangers of using SetJavaScriptEnabled.
1130     @SuppressLint("SetJavaScriptEnabled")
1131     // removeAllCookies is deprecated, but it is required for API < 21.
1132     @SuppressWarnings("deprecation")
1133     public boolean onOptionsItemSelected(MenuItem menuItem) {
1134         int menuItemId = menuItem.getItemId();
1135
1136         // Set the commands that relate to the menu entries.
1137         switch (menuItemId) {
1138             case R.id.toggle_javascript:
1139                 // Switch the status of javaScriptEnabled.
1140                 javaScriptEnabled = !javaScriptEnabled;
1141
1142                 // Apply the new JavaScript status.
1143                 mainWebView.getSettings().setJavaScriptEnabled(javaScriptEnabled);
1144
1145                 // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
1146                 updatePrivacyIcons(true);
1147
1148                 // Display a `Snackbar`.
1149                 if (javaScriptEnabled) {  // JavaScrip is enabled.
1150                     Snackbar.make(findViewById(R.id.main_webview), R.string.javascript_enabled, Snackbar.LENGTH_SHORT).show();
1151                 } else if (firstPartyCookiesEnabled) {  // JavaScript is disabled, but first-party cookies are enabled.
1152                     Snackbar.make(findViewById(R.id.main_webview), R.string.javascript_disabled, Snackbar.LENGTH_SHORT).show();
1153                 } else {  // Privacy mode.
1154                     Snackbar.make(findViewById(R.id.main_webview), R.string.privacy_mode, Snackbar.LENGTH_SHORT).show();
1155                 }
1156
1157                 // Reload the WebView.
1158                 mainWebView.reload();
1159                 return true;
1160
1161             case R.id.toggle_first_party_cookies:
1162                 // Switch the status of firstPartyCookiesEnabled.
1163                 firstPartyCookiesEnabled = !firstPartyCookiesEnabled;
1164
1165                 // Update the menu checkbox.
1166                 menuItem.setChecked(firstPartyCookiesEnabled);
1167
1168                 // Apply the new cookie status.
1169                 cookieManager.setAcceptCookie(firstPartyCookiesEnabled);
1170
1171                 // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
1172                 updatePrivacyIcons(true);
1173
1174                 // Display a `Snackbar`.
1175                 if (firstPartyCookiesEnabled) {  // First-party cookies are enabled.
1176                     Snackbar.make(findViewById(R.id.main_webview), R.string.first_party_cookies_enabled, Snackbar.LENGTH_SHORT).show();
1177                 } else if (javaScriptEnabled){  // JavaScript is still enabled.
1178                     Snackbar.make(findViewById(R.id.main_webview), R.string.first_party_cookies_disabled, Snackbar.LENGTH_SHORT).show();
1179                 } else {  // Privacy mode.
1180                     Snackbar.make(findViewById(R.id.main_webview), R.string.privacy_mode, Snackbar.LENGTH_SHORT).show();
1181                 }
1182
1183                 // Reload the WebView.
1184                 mainWebView.reload();
1185                 return true;
1186
1187             case R.id.toggle_third_party_cookies:
1188                 if (Build.VERSION.SDK_INT >= 21) {
1189                     // Switch the status of thirdPartyCookiesEnabled.
1190                     thirdPartyCookiesEnabled = !thirdPartyCookiesEnabled;
1191
1192                     // Update the menu checkbox.
1193                     menuItem.setChecked(thirdPartyCookiesEnabled);
1194
1195                     // Apply the new cookie status.
1196                     cookieManager.setAcceptThirdPartyCookies(mainWebView, thirdPartyCookiesEnabled);
1197
1198                     // Display a `Snackbar`.
1199                     if (thirdPartyCookiesEnabled) {
1200                         Snackbar.make(findViewById(R.id.main_webview), R.string.third_party_cookies_enabled, Snackbar.LENGTH_SHORT).show();
1201                     } else {
1202                         Snackbar.make(findViewById(R.id.main_webview), R.string.third_party_cookies_disabled, Snackbar.LENGTH_SHORT).show();
1203                     }
1204
1205                     // Reload the WebView.
1206                     mainWebView.reload();
1207                 } // Else do nothing because SDK < 21.
1208                 return true;
1209
1210             case R.id.toggle_dom_storage:
1211                 // Switch the status of domStorageEnabled.
1212                 domStorageEnabled = !domStorageEnabled;
1213
1214                 // Update the menu checkbox.
1215                 menuItem.setChecked(domStorageEnabled);
1216
1217                 // Apply the new DOM Storage status.
1218                 mainWebView.getSettings().setDomStorageEnabled(domStorageEnabled);
1219
1220                 // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
1221                 updatePrivacyIcons(true);
1222
1223                 // Display a `Snackbar`.
1224                 if (domStorageEnabled) {
1225                     Snackbar.make(findViewById(R.id.main_webview), R.string.dom_storage_enabled, Snackbar.LENGTH_SHORT).show();
1226                 } else {
1227                     Snackbar.make(findViewById(R.id.main_webview), R.string.dom_storage_disabled, Snackbar.LENGTH_SHORT).show();
1228                 }
1229
1230                 // Reload the WebView.
1231                 mainWebView.reload();
1232                 return true;
1233
1234             case R.id.toggle_save_form_data:
1235                 // Switch the status of saveFormDataEnabled.
1236                 saveFormDataEnabled = !saveFormDataEnabled;
1237
1238                 // Update the menu checkbox.
1239                 menuItem.setChecked(saveFormDataEnabled);
1240
1241                 // Apply the new form data status.
1242                 mainWebView.getSettings().setSaveFormData(saveFormDataEnabled);
1243
1244                 // Display a `Snackbar`.
1245                 if (saveFormDataEnabled) {
1246                     Snackbar.make(findViewById(R.id.main_webview), R.string.form_data_enabled, Snackbar.LENGTH_SHORT).show();
1247                 } else {
1248                     Snackbar.make(findViewById(R.id.main_webview), R.string.form_data_disabled, Snackbar.LENGTH_SHORT).show();
1249                 }
1250
1251                 // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
1252                 updatePrivacyIcons(true);
1253
1254                 // Reload the WebView.
1255                 mainWebView.reload();
1256                 return true;
1257
1258             case R.id.clear_cookies:
1259                 Snackbar.make(findViewById(R.id.main_webview), R.string.cookies_deleted, Snackbar.LENGTH_LONG)
1260                         .setAction(R.string.undo, new View.OnClickListener() {
1261                             @Override
1262                             public void onClick(View v) {
1263                                 // Do nothing because everything will be handled by `onDismissed()` below.
1264                             }
1265                         })
1266                         .addCallback(new Snackbar.Callback() {
1267                             @Override
1268                             public void onDismissed(Snackbar snackbar, int event) {
1269                                 switch (event) {
1270                                     // The user pushed the `Undo` button.
1271                                     case Snackbar.Callback.DISMISS_EVENT_ACTION:
1272                                         // Do nothing.
1273                                         break;
1274
1275                                     // The `Snackbar` was dismissed without the `Undo` button being pushed.
1276                                     default:
1277                                         // `cookieManager.removeAllCookie()` varies by SDK.
1278                                         if (Build.VERSION.SDK_INT < 21) {
1279                                             cookieManager.removeAllCookie();
1280                                         } else {
1281                                             // `null` indicates no callback.
1282                                             cookieManager.removeAllCookies(null);
1283                                         }
1284                                 }
1285                             }
1286                         })
1287                         .show();
1288                 return true;
1289
1290             case R.id.clear_dom_storage:
1291                 Snackbar.make(findViewById(R.id.main_webview), R.string.dom_storage_deleted, Snackbar.LENGTH_LONG)
1292                         .setAction(R.string.undo, new View.OnClickListener() {
1293                             @Override
1294                             public void onClick(View v) {
1295                                 // Do nothing because everything will be handled by `onDismissed()` below.
1296                             }
1297                         })
1298                         .addCallback(new Snackbar.Callback() {
1299                             @Override
1300                             public void onDismissed(Snackbar snackbar, int event) {
1301                                 switch (event) {
1302                                     // The user pushed the `Undo` button.
1303                                     case Snackbar.Callback.DISMISS_EVENT_ACTION:
1304                                         // Do nothing.
1305                                         break;
1306
1307                                     // The `Snackbar` was dismissed without the `Undo` button being pushed.
1308                                     default:
1309                                         // Delete the DOM Storage.
1310                                         WebStorage webStorage = WebStorage.getInstance();
1311                                         webStorage.deleteAllData();
1312                                 }
1313                             }
1314                         })
1315                         .show();
1316                 return true;
1317
1318             case R.id.clear_form_data:
1319                 Snackbar.make(findViewById(R.id.main_webview), R.string.form_data_deleted, Snackbar.LENGTH_LONG)
1320                         .setAction(R.string.undo, new View.OnClickListener() {
1321                             @Override
1322                             public void onClick(View v) {
1323                                 // Do nothing because everything will be handled by `onDismissed()` below.
1324                             }
1325                         })
1326                         .addCallback(new Snackbar.Callback() {
1327                             @Override
1328                             public void onDismissed(Snackbar snackbar, int event) {
1329                                 switch (event) {
1330                                     // The user pushed the `Undo` button.
1331                                     case Snackbar.Callback.DISMISS_EVENT_ACTION:
1332                                         // Do nothing.
1333                                         break;
1334
1335                                     // The `Snackbar` was dismissed without the `Undo` button being pushed.
1336                                     default:
1337                                         // Delete the form data.
1338                                         WebViewDatabase mainWebViewDatabase = WebViewDatabase.getInstance(getApplicationContext());
1339                                         mainWebViewDatabase.clearFormData();
1340                                 }
1341                             }
1342                         })
1343                         .show();
1344                 return true;
1345
1346             case R.id.font_size_twenty_five_percent:
1347                 mainWebView.getSettings().setTextZoom(25);
1348                 return true;
1349
1350             case R.id.font_size_fifty_percent:
1351                 mainWebView.getSettings().setTextZoom(50);
1352                 return true;
1353
1354             case R.id.font_size_seventy_five_percent:
1355                 mainWebView.getSettings().setTextZoom(75);
1356                 return true;
1357
1358             case R.id.font_size_one_hundred_percent:
1359                 mainWebView.getSettings().setTextZoom(100);
1360                 return true;
1361
1362             case R.id.font_size_one_hundred_twenty_five_percent:
1363                 mainWebView.getSettings().setTextZoom(125);
1364                 return true;
1365
1366             case R.id.font_size_one_hundred_fifty_percent:
1367                 mainWebView.getSettings().setTextZoom(150);
1368                 return true;
1369
1370             case R.id.font_size_one_hundred_seventy_five_percent:
1371                 mainWebView.getSettings().setTextZoom(175);
1372                 return true;
1373
1374             case R.id.font_size_two_hundred_percent:
1375                 mainWebView.getSettings().setTextZoom(200);
1376                 return true;
1377
1378             case R.id.display_images:
1379                 if (mainWebView.getSettings().getLoadsImagesAutomatically()) {  // Images are currently loaded automatically.
1380                     mainWebView.getSettings().setLoadsImagesAutomatically(false);
1381                     mainWebView.reload();
1382                 } else {  // Images are not currently loaded automatically.
1383                     mainWebView.getSettings().setLoadsImagesAutomatically(true);
1384                 }
1385
1386                 // Set `onTheFlyDisplayImagesSet`.
1387                 onTheFlyDisplayImagesSet = true;
1388                 return true;
1389
1390             case R.id.share:
1391                 // Setup the share string.
1392                 String shareString;
1393                 if (webViewTitle != null) {
1394                     shareString = webViewTitle + " – " + urlTextBox.getText().toString();
1395                 } else {
1396                     shareString = urlTextBox.getText().toString();
1397                 }
1398
1399                 // Create the share intent.
1400                 Intent shareIntent = new Intent();
1401                 shareIntent.setAction(Intent.ACTION_SEND);
1402                 shareIntent.putExtra(Intent.EXTRA_TEXT, shareString);
1403                 shareIntent.setType("text/plain");
1404
1405                 // Make it so.
1406                 startActivity(Intent.createChooser(shareIntent, "Share URL"));
1407                 return true;
1408
1409             case R.id.find_on_page:
1410                 // Hide the URL app bar.
1411                 supportAppBar.setVisibility(View.GONE);
1412
1413                 // Show the Find on Page `RelativeLayout`.
1414                 findOnPageLinearLayout.setVisibility(View.VISIBLE);
1415
1416                 // Display the keyboard.  We have to wait 200 ms before running the command to work around a bug in Android.
1417                 // http://stackoverflow.com/questions/5520085/android-show-softkeyboard-with-showsoftinput-is-not-working
1418                 findOnPageEditText.postDelayed(new Runnable()
1419                 {
1420                     @Override
1421                     public void run()
1422                     {
1423                         // Set the focus on `findOnPageEditText`.
1424                         findOnPageEditText.requestFocus();
1425
1426                         // Display the keyboard.
1427                         inputMethodManager.showSoftInput(findOnPageEditText, 0);
1428                     }
1429                 }, 200);
1430                 return true;
1431
1432             case R.id.print:
1433                 // Get a `PrintManager` instance.
1434                 PrintManager printManager = (PrintManager) getSystemService(Context.PRINT_SERVICE);
1435
1436                 // Convert `mainWebView` to `printDocumentAdapter`.
1437                 PrintDocumentAdapter printDocumentAdapter = mainWebView.createPrintDocumentAdapter();
1438
1439                 // Print the document.  The print attributes are `null`.
1440                 printManager.print(getResources().getString(R.string.privacy_browser_web_page), printDocumentAdapter, null);
1441                 return true;
1442
1443             case R.id.add_to_homescreen:
1444                 // Show the `CreateHomeScreenShortcutDialog` `AlertDialog` and name this instance `R.string.create_shortcut`.
1445                 AppCompatDialogFragment createHomeScreenShortcutDialogFragment = new CreateHomeScreenShortcutDialog();
1446                 createHomeScreenShortcutDialogFragment.show(getSupportFragmentManager(), getResources().getString(R.string.create_shortcut));
1447
1448                 //Everything else will be handled by `CreateHomeScreenShortcutDialog` and the associated listener below.
1449                 return true;
1450
1451             case R.id.refresh:
1452                 mainWebView.reload();
1453                 return true;
1454
1455             default:
1456                 // Don't consume the event.
1457                 return super.onOptionsItemSelected(menuItem);
1458         }
1459     }
1460
1461     // removeAllCookies is deprecated, but it is required for API < 21.
1462     @SuppressWarnings("deprecation")
1463     @Override
1464     public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
1465         int menuItemId = menuItem.getItemId();
1466
1467         switch (menuItemId) {
1468             case R.id.home:
1469                 loadUrl(homepage);
1470                 break;
1471
1472             case R.id.back:
1473                 if (mainWebView.canGoBack()) {
1474                     // Set `navigatingHistory` so that the domain settings are applied when the new URL is loaded.
1475                     navigatingHistory = true;
1476
1477                     // Load the previous website in the history.
1478                     mainWebView.goBack();
1479                 }
1480                 break;
1481
1482             case R.id.forward:
1483                 if (mainWebView.canGoForward()) {
1484                     // Set `navigatingHistory` so that the domain settings are applied when the new URL is loaded.
1485                     navigatingHistory = true;
1486
1487                     // Load the next website in the history.
1488                     mainWebView.goForward();
1489                 }
1490                 break;
1491
1492             case R.id.history:
1493                 // Get the `WebBackForwardList`.
1494                 WebBackForwardList webBackForwardList = mainWebView.copyBackForwardList();
1495
1496                 // Show the `UrlHistoryDialog` `AlertDialog` and name this instance `R.string.history`.  `this` is the `Context`.
1497                 AppCompatDialogFragment urlHistoryDialogFragment = UrlHistoryDialog.loadBackForwardList(this, webBackForwardList);
1498                 urlHistoryDialogFragment.show(getSupportFragmentManager(), getResources().getString(R.string.history));
1499                 break;
1500
1501             case R.id.bookmarks:
1502                 // Launch BookmarksActivity.
1503                 Intent bookmarksIntent = new Intent(this, BookmarksActivity.class);
1504                 startActivity(bookmarksIntent);
1505                 break;
1506
1507             case R.id.downloads:
1508                 // Launch the system Download Manager.
1509                 Intent downloadManagerIntent = new Intent(DownloadManager.ACTION_VIEW_DOWNLOADS);
1510
1511                 // Launch as a new task so that Download Manager and Privacy Browser show as separate windows in the recent tasks list.
1512                 downloadManagerIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
1513
1514                 startActivity(downloadManagerIntent);
1515                 break;
1516
1517             case R.id.settings:
1518                 // Reset `currentDomainName` so that domain settings are reapplied after returning to `MainWebViewActivity`.
1519                 currentDomainName = "";
1520
1521                 // Launch `SettingsActivity`.
1522                 Intent settingsIntent = new Intent(this, SettingsActivity.class);
1523                 startActivity(settingsIntent);
1524                 break;
1525
1526             case R.id.domains:
1527                 // Reset `currentDomainName` so that domain settings are reapplied after returning to `MainWebViewActivity`.
1528                 currentDomainName = "";
1529
1530                 // Launch `DomainsActivity`.
1531                 Intent domainsIntent = new Intent(this, DomainsActivity.class);
1532                 startActivity(domainsIntent);
1533                 break;
1534
1535             case R.id.guide:
1536                 // Launch `GuideActivity`.
1537                 Intent guideIntent = new Intent(this, GuideActivity.class);
1538                 startActivity(guideIntent);
1539                 break;
1540
1541             case R.id.about:
1542                 // Launch `AboutActivity`.
1543                 Intent aboutIntent = new Intent(this, AboutActivity.class);
1544                 startActivity(aboutIntent);
1545                 break;
1546
1547             case R.id.clearAndExit:
1548                 // Get a handle for `sharedPreferences`.  `this` references the current context.
1549                 SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
1550
1551                 boolean clearEverything = sharedPreferences.getBoolean("clear_everything", true);
1552
1553                 // Clear cookies.
1554                 if (clearEverything || sharedPreferences.getBoolean("clear_cookies", true)) {
1555                     // The command to remove cookies changed slightly in API 21.
1556                     if (Build.VERSION.SDK_INT >= 21) {
1557                         cookieManager.removeAllCookies(null);
1558                     } else {
1559                         cookieManager.removeAllCookie();
1560                     }
1561
1562                     // Manually delete the cookies database, as `CookieManager` sometimes will not flush its changes to disk before `System.exit(0)` is run.
1563                     try {
1564                         // We have to use two commands because `Runtime.exec()` does not like `*`.
1565                         privacyBrowserRuntime.exec("rm -f " + privateDataDirectoryString + "/app_webview/Cookies");
1566                         privacyBrowserRuntime.exec("rm -f " + privateDataDirectoryString + "/app_webview/Cookies-journal");
1567                     } catch (IOException e) {
1568                         // Do nothing if an error is thrown.
1569                     }
1570                 }
1571
1572                 // Clear DOM storage.
1573                 if (clearEverything || sharedPreferences.getBoolean("clear_dom_storage", true)) {
1574                     // Ask `WebStorage` to clear the DOM storage.
1575                     WebStorage webStorage = WebStorage.getInstance();
1576                     webStorage.deleteAllData();
1577
1578                     // Manually delete the DOM storage directory, as `WebStorage` sometimes will not flush its changes to disk before `System.exit(0)` is run.
1579                     try {
1580                         // We have to use a `String[]` because the directory contains a space and `Runtime.exec` will not escape the string correctly otherwise.
1581                         privacyBrowserRuntime.exec(new String[] {"rm", "-rf", privateDataDirectoryString + "/app_webview/Local Storage/"});
1582                     } catch (IOException e) {
1583                         // Do nothing if an error is thrown.
1584                     }
1585                 }
1586
1587                 // Clear form data.
1588                 if (clearEverything || sharedPreferences.getBoolean("clear_form_data", true)) {
1589                     WebViewDatabase webViewDatabase = WebViewDatabase.getInstance(this);
1590                     webViewDatabase.clearFormData();
1591
1592                     // Manually delete the form data database, as `WebViewDatabase` sometimes will not flush its changes to disk before `System.exit(0)` is run.
1593                     try {
1594                         // We have to use a `String[]` because the database contains a space and `Runtime.exec` will not escape the string correctly otherwise.
1595                         privacyBrowserRuntime.exec(new String[] {"rm", "-f", privateDataDirectoryString + "/app_webview/Web Data"});
1596                         privacyBrowserRuntime.exec(new String[] {"rm", "-f", privateDataDirectoryString + "/app_webview/Web Data-journal"});
1597                     } catch (IOException e) {
1598                         // Do nothing if an error is thrown.
1599                     }
1600                 }
1601
1602                 // Clear the cache.
1603                 if (clearEverything || sharedPreferences.getBoolean("clear_cache", true)) {
1604                     // `true` includes disk files.
1605                     mainWebView.clearCache(true);
1606
1607                     // Manually delete the cache directories.
1608                     try {
1609                         // Delete the main cache directory.
1610                         privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/cache");
1611
1612                         // Delete the secondary `Service Worker` cache directory.  We have to use a `String[]` because the directory contains a space and `Runtime.exec` will not escape the string correctly otherwise.
1613                         privacyBrowserRuntime.exec(new String[] {"rm", "-rf", privateDataDirectoryString + "/app_webview/Service Worker/"});
1614                     } catch (IOException e) {
1615                         // Do nothing if an error is thrown.
1616                     }
1617                 }
1618
1619                 // Clear SSL certificate preferences.
1620                 mainWebView.clearSslPreferences();
1621
1622                 // Clear the back/forward history.
1623                 mainWebView.clearHistory();
1624
1625                 // Clear `formattedUrlString`.
1626                 formattedUrlString = null;
1627
1628                 // Clear `customHeaders`.
1629                 customHeaders.clear();
1630
1631                 // Detach all views from `mainWebViewRelativeLayout`.
1632                 mainWebViewRelativeLayout.removeAllViews();
1633
1634                 // Destroy the internal state of `mainWebView`.
1635                 mainWebView.destroy();
1636
1637                 // Manually delete the `app_webview` folder, which contains the cookies, DOM storage, form data, and `Service Worker` cache.
1638                 // See `https://code.google.com/p/android/issues/detail?id=233826&thanks=233826&ts=1486670530`.
1639                 if (clearEverything) {
1640                     try {
1641                         privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/app_webview");
1642                     } catch (IOException e) {
1643                         // Do nothing if an error is thrown.
1644                     }
1645                 }
1646
1647                 // Close Privacy Browser.  `finishAndRemoveTask` also removes Privacy Browser from the recent app list.
1648                 if (Build.VERSION.SDK_INT >= 21) {
1649                     finishAndRemoveTask();
1650                 } else {
1651                     finish();
1652                 }
1653
1654                 // Remove the terminated program from RAM.  The status code is `0`.
1655                 System.exit(0);
1656                 break;
1657         }
1658
1659         // Close the navigation drawer.
1660         drawerLayout.closeDrawer(GravityCompat.START);
1661         return true;
1662     }
1663
1664     @Override
1665     public void onPostCreate(Bundle savedInstanceState) {
1666         super.onPostCreate(savedInstanceState);
1667
1668         // Sync the state of the DrawerToggle after onRestoreInstanceState has finished.
1669         drawerToggle.syncState();
1670     }
1671
1672     @Override
1673     public void onConfigurationChanged(Configuration newConfig) {
1674         super.onConfigurationChanged(newConfig);
1675
1676         // Reload the ad for the free flavor if we are not in full screen mode.
1677         if (BuildConfig.FLAVOR.contentEquals("free") && !inFullScreenBrowsingMode) {
1678             // Reload the ad.
1679             BannerAd.reloadAfterRotate(adView, getApplicationContext(), getString(R.string.ad_id));
1680
1681             // Reinitialize the `adView` variable, as the `View` will have been removed and re-added by `BannerAd.reloadAfterRotate()`.
1682             adView = findViewById(R.id.adview);
1683         }
1684
1685         // `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:  https://code.google.com/p/android/issues/detail?id=20493#c8
1686         // ActivityCompat.invalidateOptionsMenu(this);
1687     }
1688
1689     @Override
1690     public void onCreateContextMenu(ContextMenu menu, View view, ContextMenu.ContextMenuInfo menuInfo) {
1691         // Store the `HitTestResult`.
1692         final WebView.HitTestResult hitTestResult = mainWebView.getHitTestResult();
1693
1694         // Create strings.
1695         final String imageUrl;
1696         final String linkUrl;
1697
1698         // Get a handle for the `ClipboardManager`.
1699         final ClipboardManager clipboardManager = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
1700
1701         switch (hitTestResult.getType()) {
1702             // `SRC_ANCHOR_TYPE` is a link.
1703             case WebView.HitTestResult.SRC_ANCHOR_TYPE:
1704                 // Get the target URL.
1705                 linkUrl = hitTestResult.getExtra();
1706
1707                 // Set the target URL as the title of the `ContextMenu`.
1708                 menu.setHeaderTitle(linkUrl);
1709
1710                 // Add a `Load URL` entry.
1711                 menu.add(R.string.load_url).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1712                     @Override
1713                     public boolean onMenuItemClick(MenuItem item) {
1714                         loadUrl(linkUrl);
1715                         return false;
1716                     }
1717                 });
1718
1719                 // Add a `Copy URL` entry.
1720                 menu.add(R.string.copy_url).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1721                     @Override
1722                     public boolean onMenuItemClick(MenuItem item) {
1723                         // Save the link URL in a `ClipData`.
1724                         ClipData srcAnchorTypeClipData = ClipData.newPlainText(getResources().getString(R.string.url), linkUrl);
1725
1726                         // Set the `ClipData` as the clipboard's primary clip.
1727                         clipboardManager.setPrimaryClip(srcAnchorTypeClipData);
1728                         return false;
1729                     }
1730                 });
1731
1732                 // Add a `Cancel` entry, which by default closes the `ContextMenu`.
1733                 menu.add(R.string.cancel);
1734                 break;
1735
1736             case WebView.HitTestResult.EMAIL_TYPE:
1737                 // Get the target URL.
1738                 linkUrl = hitTestResult.getExtra();
1739
1740                 // Set the target URL as the title of the `ContextMenu`.
1741                 menu.setHeaderTitle(linkUrl);
1742
1743                 // Add a `Write Email` entry.
1744                 menu.add(R.string.write_email).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1745                     @Override
1746                     public boolean onMenuItemClick(MenuItem item) {
1747                         // We use `ACTION_SENDTO` instead of `ACTION_SEND` so that only email programs are launched.
1748                         Intent emailIntent = new Intent(Intent.ACTION_SENDTO);
1749
1750                         // Parse the url and set it as the data for the `Intent`.
1751                         emailIntent.setData(Uri.parse("mailto:" + linkUrl));
1752
1753                         // `FLAG_ACTIVITY_NEW_TASK` opens the email program in a new task instead as part of Privacy Browser.
1754                         emailIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
1755
1756                         // Make it so.
1757                         startActivity(emailIntent);
1758                         return false;
1759                     }
1760                 });
1761
1762                 // Add a `Copy Email Address` entry.
1763                 menu.add(R.string.copy_email_address).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1764                     @Override
1765                     public boolean onMenuItemClick(MenuItem item) {
1766                         // Save the email address in a `ClipData`.
1767                         ClipData srcEmailTypeClipData = ClipData.newPlainText(getResources().getString(R.string.email_address), linkUrl);
1768
1769                         // Set the `ClipData` as the clipboard's primary clip.
1770                         clipboardManager.setPrimaryClip(srcEmailTypeClipData);
1771                         return false;
1772                     }
1773                 });
1774
1775                 // Add a `Cancel` entry, which by default closes the `ContextMenu`.
1776                 menu.add(R.string.cancel);
1777                 break;
1778
1779             // `IMAGE_TYPE` is an image.
1780             case WebView.HitTestResult.IMAGE_TYPE:
1781                 // Get the image URL.
1782                 imageUrl = hitTestResult.getExtra();
1783
1784                 // Set the image URL as the title of the `ContextMenu`.
1785                 menu.setHeaderTitle(imageUrl);
1786
1787                 // Add a `View Image` entry.
1788                 menu.add(R.string.view_image).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1789                     @Override
1790                     public boolean onMenuItemClick(MenuItem item) {
1791                         loadUrl(imageUrl);
1792                         return false;
1793                     }
1794                 });
1795
1796                 // Add a `Download Image` entry.
1797                 menu.add(R.string.download_image).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1798                     @Override
1799                     public boolean onMenuItemClick(MenuItem item) {
1800                         // Show the `DownloadImageDialog` `AlertDialog` and name this instance `@string/download`.
1801                         AppCompatDialogFragment downloadImageDialogFragment = DownloadImageDialog.imageUrl(imageUrl);
1802                         downloadImageDialogFragment.show(getSupportFragmentManager(), getResources().getString(R.string.download));
1803                         return false;
1804                     }
1805                 });
1806
1807                 // Add a `Copy URL` entry.
1808                 menu.add(R.string.copy_url).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1809                     @Override
1810                     public boolean onMenuItemClick(MenuItem item) {
1811                         // Save the image URL in a `ClipData`.
1812                         ClipData srcImageTypeClipData = ClipData.newPlainText(getResources().getString(R.string.url), imageUrl);
1813
1814                         // Set the `ClipData` as the clipboard's primary clip.
1815                         clipboardManager.setPrimaryClip(srcImageTypeClipData);
1816                         return false;
1817                     }
1818                 });
1819
1820                 // Add a `Cancel` entry, which by default closes the `ContextMenu`.
1821                 menu.add(R.string.cancel);
1822                 break;
1823
1824
1825             // `SRC_IMAGE_ANCHOR_TYPE` is an image that is also a link.
1826             case WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE:
1827                 // Get the image URL.
1828                 imageUrl = hitTestResult.getExtra();
1829
1830                 // Set the image URL as the title of the `ContextMenu`.
1831                 menu.setHeaderTitle(imageUrl);
1832
1833                 // Add a `View Image` entry.
1834                 menu.add(R.string.view_image).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1835                     @Override
1836                     public boolean onMenuItemClick(MenuItem item) {
1837                         loadUrl(imageUrl);
1838                         return false;
1839                     }
1840                 });
1841
1842                 // Add a `Download Image` entry.
1843                 menu.add(R.string.download_image).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1844                     @Override
1845                     public boolean onMenuItemClick(MenuItem item) {
1846                         // Show the `DownloadImageDialog` `AlertDialog` and name this instance `@string/download`.
1847                         AppCompatDialogFragment downloadImageDialogFragment = DownloadImageDialog.imageUrl(imageUrl);
1848                         downloadImageDialogFragment.show(getSupportFragmentManager(), getResources().getString(R.string.download));
1849                         return false;
1850                     }
1851                 });
1852
1853                 // Add a `Copy URL` entry.
1854                 menu.add(R.string.copy_url).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1855                     @Override
1856                     public boolean onMenuItemClick(MenuItem item) {
1857                         // Save the image URL in a `ClipData`.
1858                         ClipData srcImageAnchorTypeClipData = ClipData.newPlainText(getResources().getString(R.string.url), imageUrl);
1859
1860                         // Set the `ClipData` as the clipboard's primary clip.
1861                         clipboardManager.setPrimaryClip(srcImageAnchorTypeClipData);
1862                         return false;
1863                     }
1864                 });
1865
1866                 // Add a `Cancel` entry, which by default closes the `ContextMenu`.
1867                 menu.add(R.string.cancel);
1868                 break;
1869         }
1870     }
1871
1872     @Override
1873     public void onCreateHomeScreenShortcut(AppCompatDialogFragment dialogFragment) {
1874         // Get shortcutNameEditText from the alert dialog.
1875         EditText shortcutNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.shortcut_name_edittext);
1876
1877         // Create the bookmark shortcut based on formattedUrlString.
1878         Intent bookmarkShortcut = new Intent();
1879         bookmarkShortcut.setAction(Intent.ACTION_VIEW);
1880         bookmarkShortcut.setData(Uri.parse(formattedUrlString));
1881
1882         // Place the bookmark shortcut on the home screen.
1883         Intent placeBookmarkShortcut = new Intent();
1884         placeBookmarkShortcut.putExtra("android.intent.extra.shortcut.INTENT", bookmarkShortcut);
1885         placeBookmarkShortcut.putExtra("android.intent.extra.shortcut.NAME", shortcutNameEditText.getText().toString());
1886         placeBookmarkShortcut.putExtra("android.intent.extra.shortcut.ICON", favoriteIconBitmap);
1887         placeBookmarkShortcut.setAction("com.android.launcher.action.INSTALL_SHORTCUT");
1888         sendBroadcast(placeBookmarkShortcut);
1889     }
1890
1891     @Override
1892     public void onDownloadImage(AppCompatDialogFragment dialogFragment, String imageUrl) {
1893         // Download the image if it has an HTTP or HTTPS URI.
1894         if (imageUrl.startsWith("http")) {
1895             // Get a handle for the system `DOWNLOAD_SERVICE`.
1896             DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
1897
1898             // Parse `imageUrl`.
1899             DownloadManager.Request downloadRequest = new DownloadManager.Request(Uri.parse(imageUrl));
1900
1901             // Pass cookies to download manager if cookies are enabled.  This is required to download images from websites that require a login.
1902             // Code contributed 2017 Hendrik Knackstedt.  Copyright assigned to Soren Stoutner <soren@stoutner.com>.
1903             if (firstPartyCookiesEnabled) {
1904                 // Get the cookies for `imageUrl`.
1905                 String cookies = cookieManager.getCookie(imageUrl);
1906
1907                 // Add the cookies to `downloadRequest`.  In the HTTP request header, cookies are named `Cookie`.
1908                 downloadRequest.addRequestHeader("Cookie", cookies);
1909             }
1910
1911             // Get the file name from `dialogFragment`.
1912             EditText downloadImageNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.download_image_name);
1913             String imageName = downloadImageNameEditText.getText().toString();
1914
1915             // Once we have `WRITE_EXTERNAL_STORAGE` permissions we can use `setDestinationInExternalPublicDir`.
1916             if (Build.VERSION.SDK_INT >= 23) { // If API >= 23, set the download save in the the `DIRECTORY_DOWNLOADS` using `imageName`.
1917                 downloadRequest.setDestinationInExternalFilesDir(this, "/", imageName);
1918             } else { // Only set the title using `imageName`.
1919                 downloadRequest.setTitle(imageName);
1920             }
1921
1922             // Allow `MediaScanner` to index the download if it is a media file.
1923             downloadRequest.allowScanningByMediaScanner();
1924
1925             // Add the URL as the description for the download.
1926             downloadRequest.setDescription(imageUrl);
1927
1928             // Show the download notification after the download is completed.
1929             downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
1930
1931             // Initiate the download.
1932             downloadManager.enqueue(downloadRequest);
1933         } else {  // The image is not an HTTP or HTTPS URI.
1934             Snackbar.make(mainWebView, R.string.cannot_download_image, Snackbar.LENGTH_INDEFINITE).show();
1935         }
1936     }
1937
1938     @Override
1939     public void onDownloadFile(AppCompatDialogFragment dialogFragment, String downloadUrl) {
1940         // Download the file if it has an HTTP or HTTPS URI.
1941         if (downloadUrl.startsWith("http")) {
1942
1943             // Get a handle for the system `DOWNLOAD_SERVICE`.
1944             DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
1945
1946             // Parse `downloadUrl`.
1947             DownloadManager.Request downloadRequest = new DownloadManager.Request(Uri.parse(downloadUrl));
1948
1949             // Pass cookies to download manager if cookies are enabled.  This is required to download files from websites that require a login.
1950             // Code contributed 2017 Hendrik Knackstedt.  Copyright assigned to Soren Stoutner <soren@stoutner.com>.
1951             if (firstPartyCookiesEnabled) {
1952                 // Get the cookies for `downloadUrl`.
1953                 String cookies = cookieManager.getCookie(downloadUrl);
1954
1955                 // Add the cookies to `downloadRequest`.  In the HTTP request header, cookies are named `Cookie`.
1956                 downloadRequest.addRequestHeader("Cookie", cookies);
1957             }
1958
1959             // Get the file name from `dialogFragment`.
1960             EditText downloadFileNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.download_file_name);
1961             String fileName = downloadFileNameEditText.getText().toString();
1962
1963             // Once we have `WRITE_EXTERNAL_STORAGE` permissions we can use `setDestinationInExternalPublicDir`.
1964             if (Build.VERSION.SDK_INT >= 23) { // If API >= 23, set the download location to `/sdcard/Android/data/com.stoutner.privacybrowser.standard/files` named `fileName`.
1965                 downloadRequest.setDestinationInExternalFilesDir(this, "/", fileName);
1966             } else { // Only set the title using `fileName`.
1967                 downloadRequest.setTitle(fileName);
1968             }
1969
1970             // Allow `MediaScanner` to index the download if it is a media file.
1971             downloadRequest.allowScanningByMediaScanner();
1972
1973             // Add the URL as the description for the download.
1974             downloadRequest.setDescription(downloadUrl);
1975
1976             // Show the download notification after the download is completed.
1977             downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
1978
1979             // Initiate the download.
1980             downloadManager.enqueue(downloadRequest);
1981         } else {  // The download is not an HTTP or HTTPS URI.
1982             Snackbar.make(mainWebView, R.string.cannot_download_file, Snackbar.LENGTH_INDEFINITE).show();
1983         }
1984     }
1985
1986     public void viewSslCertificate(View view) {
1987         // Show the `ViewSslCertificateDialog` `AlertDialog` and name this instance `@string/view_ssl_certificate`.
1988         DialogFragment viewSslCertificateDialogFragment = new ViewSslCertificateDialog();
1989         viewSslCertificateDialogFragment.show(getFragmentManager(), getResources().getString(R.string.view_ssl_certificate));
1990     }
1991
1992     @Override
1993     public void onSslErrorCancel() {
1994         sslErrorHandler.cancel();
1995     }
1996
1997     @Override
1998     public void onSslErrorProceed() {
1999         sslErrorHandler.proceed();
2000     }
2001
2002     @Override
2003     public void onUrlHistoryEntrySelected(int moveBackOrForwardSteps) {
2004         // Set `navigatingHistory` so that the domain settings are applied when the new URL is loaded.
2005         navigatingHistory = true;
2006
2007         // Load the history entry.
2008         mainWebView.goBackOrForward(moveBackOrForwardSteps);
2009     }
2010
2011     @Override
2012     public void onClearHistory() {
2013         // Clear the history.
2014         mainWebView.clearHistory();
2015     }
2016
2017     // Override `onBackPressed` to handle the navigation drawer and `mainWebView`.
2018     @Override
2019     public void onBackPressed() {
2020         // Close the navigation drawer if it is available.  GravityCompat.START is the drawer on the left on Left-to-Right layout text.
2021         if (drawerLayout.isDrawerVisible(GravityCompat.START)) {
2022             drawerLayout.closeDrawer(GravityCompat.START);
2023         } else {
2024             // Load the previous URL if available.
2025             if (mainWebView.canGoBack()) {
2026                 // Set `navigatingHistory` so that the domain settings are applied when the new URL is loaded.
2027                 navigatingHistory = true;
2028
2029                 // Go back.
2030                 mainWebView.goBack();
2031             } else {
2032                 // Pass `onBackPressed()` to the system.
2033                 super.onBackPressed();
2034             }
2035         }
2036     }
2037
2038     private void loadUrlFromTextBox() throws UnsupportedEncodingException {
2039         // Get the text from urlTextBox and convert it to a string.  trim() removes white spaces from the beginning and end of the string.
2040         String unformattedUrlString = urlTextBox.getText().toString().trim();
2041
2042         // Check to see if `unformattedUrlString` is a valid URL.  Otherwise, convert it into a search.
2043         if ((Patterns.WEB_URL.matcher(unformattedUrlString).matches()) || (unformattedUrlString.startsWith("http://")) || (unformattedUrlString.startsWith("https://"))) {
2044             // Add `http://` at the beginning if it is missing.  Otherwise the app will segfault.
2045             if (!unformattedUrlString.startsWith("http")) {
2046                 unformattedUrlString = "http://" + unformattedUrlString;
2047             }
2048
2049             // Initialize `unformattedUrl`.
2050             URL unformattedUrl = null;
2051
2052             // Convert `unformattedUrlString` to a `URL`, then to a `URI`, and then back to a `String`, which sanitizes the input and adds in any missing components.
2053             try {
2054                 unformattedUrl = new URL(unformattedUrlString);
2055             } catch (MalformedURLException e) {
2056                 e.printStackTrace();
2057             }
2058
2059             // The ternary operator (? :) makes sure that a null pointer exception is not thrown, which would happen if `.get` was called on a `null` value.
2060             final String scheme = unformattedUrl != null ? unformattedUrl.getProtocol() : null;
2061             final String authority = unformattedUrl != null ? unformattedUrl.getAuthority() : null;
2062             final String path = unformattedUrl != null ? unformattedUrl.getPath() : null;
2063             final String query = unformattedUrl != null ? unformattedUrl.getQuery() : null;
2064             final String fragment = unformattedUrl != null ? unformattedUrl.getRef() : null;
2065
2066             // Build the URI.
2067             Uri.Builder formattedUri = new Uri.Builder();
2068             formattedUri.scheme(scheme).authority(authority).path(path).query(query).fragment(fragment);
2069
2070             // Decode `formattedUri` as a `String` in `UTF-8`.
2071             formattedUrlString = URLDecoder.decode(formattedUri.build().toString(), "UTF-8");
2072         } else {
2073             // Sanitize the search input and convert it to a search.
2074             final String encodedUrlString = URLEncoder.encode(unformattedUrlString, "UTF-8");
2075
2076             // Add the base search URL.
2077             formattedUrlString = searchURL + encodedUrlString;
2078         }
2079
2080         loadUrl(formattedUrlString);
2081
2082         // Hide the keyboard so we can see the webpage.  `0` indicates no additional flags.
2083         inputMethodManager.hideSoftInputFromWindow(mainWebView.getWindowToken(), 0);
2084     }
2085
2086
2087     private void loadUrl(String url) {
2088         // Apply any custom domain settings.
2089         applyDomainSettings(url);
2090
2091         // Load the URL.
2092         mainWebView.loadUrl(url, customHeaders);
2093     }
2094
2095     public void findPreviousOnPage(View view) {
2096         // Go to the previous highlighted phrase on the page.  `false` goes backwards instead of forwards.
2097         mainWebView.findNext(false);
2098     }
2099
2100     public void findNextOnPage(View view) {
2101         // Go to the next highlighted phrase on the page. `true` goes forwards instead of backwards.
2102         mainWebView.findNext(true);
2103     }
2104
2105     public void closeFindOnPage(View view) {
2106         // Delete the contents of `find_on_page_edittext`.
2107         findOnPageEditText.setText(null);
2108
2109         // Clear the highlighted phrases.
2110         mainWebView.clearMatches();
2111
2112         // Hide the Find on Page `RelativeLayout`.
2113         findOnPageLinearLayout.setVisibility(View.GONE);
2114
2115         // Show the URL app bar.
2116         supportAppBar.setVisibility(View.VISIBLE);
2117
2118         // Hide the keyboard so we can see the webpage.  `0` indicates no additional flags.
2119         inputMethodManager.hideSoftInputFromWindow(mainWebView.getWindowToken(), 0);
2120     }
2121
2122     private void applyAppSettings() {
2123         // Get a handle for `sharedPreferences`.  `this` references the current context.
2124         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
2125
2126         // Store the values from `sharedPreferences` in variables.
2127         String homepageString = sharedPreferences.getString("homepage", "https://start.duckduckgo.com");
2128         String torHomepageString = sharedPreferences.getString("tor_homepage", "https://3g2upl4pq6kufc4m.onion");
2129         String torSearchString = sharedPreferences.getString("tor_search", "https://3g2upl4pq6kufc4m.onion/html/?q=");
2130         String torSearchCustomURLString = sharedPreferences.getString("tor_search_custom_url", "");
2131         String searchString = sharedPreferences.getString("search", "https://duckduckgo.com/html/?q=");
2132         String searchCustomURLString = sharedPreferences.getString("search_custom_url", "");
2133         adBlockerEnabled = sharedPreferences.getBoolean("block_ads", true);
2134         incognitoModeEnabled = sharedPreferences.getBoolean("incognito_mode", false);
2135         boolean doNotTrackEnabled = sharedPreferences.getBoolean("do_not_track", false);
2136         boolean proxyThroughOrbot = sharedPreferences.getBoolean("proxy_through_orbot", false);
2137         fullScreenBrowsingModeEnabled = sharedPreferences.getBoolean("full_screen_browsing_mode", false);
2138         hideSystemBarsOnFullscreen = sharedPreferences.getBoolean("hide_system_bars", false);
2139         translucentNavigationBarOnFullscreen = sharedPreferences.getBoolean("translucent_navigation_bar", true);
2140         swipeToRefreshEnabled = sharedPreferences.getBoolean("swipe_to_refresh", false);
2141         displayWebpageImagesBoolean = sharedPreferences.getBoolean("display_webpage_images", true);
2142
2143         // Set the homepage, search, and proxy options.
2144         if (proxyThroughOrbot) {  // Set the Tor options.
2145             // Set `torHomepageString` as `homepage`.
2146             homepage = torHomepageString;
2147
2148             // If formattedUrlString is null assign the homepage to it.
2149             if (formattedUrlString == null) {
2150                 formattedUrlString = homepage;
2151             }
2152
2153             // Set the search URL.
2154             if (torSearchString.equals("Custom URL")) {  // Get the custom URL string.
2155                 searchURL = torSearchCustomURLString;
2156             } else {  // Use the string from the pre-built list.
2157                 searchURL = torSearchString;
2158             }
2159
2160             // Set the proxy.  `this` refers to the current activity where an `AlertDialog` might be displayed.
2161             OrbotProxyHelper.setProxy(getApplicationContext(), this, "localhost", "8118");
2162
2163             // Display a message to the user if we are waiting on Orbot.
2164             if (!orbotStatus.equals("ON")) {
2165                 // Set `waitingForOrbot`.
2166                 waitingForOrbot = true;
2167
2168                 // Load a waiting page.  `null` specifies no encoding, which defaults to ASCII.
2169                 mainWebView.loadData(waitingForOrbotHTMLString, "text/html", null);
2170             }
2171         } else {  // Set the non-Tor options.
2172             // Set `homepageString` as `homepage`.
2173             homepage = homepageString;
2174
2175             // If formattedUrlString is null assign the homepage to it.
2176             if (formattedUrlString == null) {
2177                 formattedUrlString = homepage;
2178             }
2179
2180             // Set the search URL.
2181             if (searchString.equals("Custom URL")) {  // Get the custom URL string.
2182                 searchURL = searchCustomURLString;
2183             } else {  // Use the string from the pre-built list.
2184                 searchURL = searchString;
2185             }
2186
2187             // Reset the proxy to default.  The host is `""` and the port is `"0"`.
2188             OrbotProxyHelper.setProxy(getApplicationContext(), this, "", "0");
2189
2190             // Reset `waitingForOrbot.
2191             waitingForOrbot = false;
2192         }
2193
2194         // Set swipe to refresh.
2195         swipeRefreshLayout.setEnabled(swipeToRefreshEnabled);
2196
2197         // Set Do Not Track status.
2198         if (doNotTrackEnabled) {
2199             customHeaders.put("DNT", "1");
2200         } else {
2201             customHeaders.remove("DNT");
2202         }
2203
2204         // Apply the appropriate full screen mode the `SYSTEM_UI` flags.
2205         if (fullScreenBrowsingModeEnabled && inFullScreenBrowsingMode) {
2206             if (hideSystemBarsOnFullscreen) {  // Hide everything.
2207                 // Remove the translucent navigation setting if it is currently flagged.
2208                 getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
2209
2210                 // Remove the translucent status bar overlay.
2211                 getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
2212
2213                 // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
2214                 drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
2215
2216                 /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
2217                  * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
2218                  * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically rehides them after they are shown.
2219                  */
2220                 rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
2221             } else {  // Hide everything except the status and navigation bars.
2222                 // Add the translucent status flag if it is unset.
2223                 getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
2224
2225                 if (translucentNavigationBarOnFullscreen) {
2226                     // Set the navigation bar to be translucent.
2227                     getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
2228                 } else {
2229                     // Set the navigation bar to be black.
2230                     getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
2231                 }
2232             }
2233         } else {  // Switch to normal viewing mode.
2234             // Reset `inFullScreenBrowsingMode` to `false`.
2235             inFullScreenBrowsingMode = false;
2236
2237             // Show the `appBar` if `findOnPageLinearLayout` is not visible.
2238             if (findOnPageLinearLayout.getVisibility() == View.GONE) {
2239                 appBar.show();
2240             }
2241
2242             // Show the `BannerAd` in the free flavor.
2243             if (BuildConfig.FLAVOR.contentEquals("free")) {
2244                 // Reload the ad.  Because the screen may have rotated, we need to use `reloadAfterRotate`.
2245                 BannerAd.reloadAfterRotate(adView, getApplicationContext(), getString(R.string.ad_id));
2246
2247                 // Reinitialize the `adView` variable, as the `View` will have been removed and re-added by `BannerAd.reloadAfterRotate()`.
2248                 adView = findViewById(R.id.adview);
2249             }
2250
2251             // Remove the translucent navigation bar flag if it is set.
2252             getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
2253
2254             // Add the translucent status flag if it is unset.  This also resets `drawerLayout's` `View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN`.
2255             getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
2256
2257             // Remove any `SYSTEM_UI` flags from `rootCoordinatorLayout`.
2258             rootCoordinatorLayout.setSystemUiVisibility(0);
2259
2260             // Constrain `rootCoordinatorLayout` inside the status and navigation bars.
2261             rootCoordinatorLayout.setFitsSystemWindows(true);
2262         }
2263     }
2264
2265     // We have to use the deprecated `.getDrawable()` until the minimum API >= 21.
2266     @SuppressWarnings("deprecation")
2267     private void applyDomainSettings(String url) {
2268         // Reset `navigatingHistory`.
2269         navigatingHistory = false;
2270
2271         // Parse the URL into a URI.
2272         Uri uri = Uri.parse(url);
2273
2274         // Extract the domain from `uri`.
2275         String hostName = uri.getHost();
2276
2277         // Initialize `loadingNewDomainName`.
2278         boolean loadingNewDomainName;
2279
2280         // If either `hostName` or `currentDomainName` are `null`, run the options for loading a new domain name.
2281         // The lint suggestion to simplify the `if` statement is incorrect, because `hostName.equals(currentDomainName)` can produce a `null object reference.`
2282         //noinspection SimplifiableIfStatement
2283         if ((hostName == null) || (currentDomainName == null)) {
2284             loadingNewDomainName = true;
2285         } else {  // Determine if `hostName` equals `currentDomainName`.
2286             loadingNewDomainName = !hostName.equals(currentDomainName);
2287         }
2288
2289         // Only apply the domain settings if we are loading a new domain.  This allows the user to set temporary settings for JavaScript, cookies, DOM storage, etc.
2290         if (loadingNewDomainName) {
2291             // Set the new `hostname` as the `currentDomainName`.
2292             currentDomainName = hostName;
2293
2294             // Reset `favoriteIconBitmap` and display it in the `appbar`.
2295             favoriteIconBitmap = favoriteIconDefaultBitmap;
2296             favoriteIconImageView.setImageBitmap(Bitmap.createScaledBitmap(favoriteIconBitmap, 64, 64, true));
2297
2298             // Initialize the database handler.  `this` specifies the context.  The two `nulls` do not specify the database name or a `CursorFactory`.
2299             // The `0` specifies the database version, but that is ignored and set instead using a constant in `DomainsDatabaseHelper`.
2300             DomainsDatabaseHelper domainsDatabaseHelper = new DomainsDatabaseHelper(this, null, null, 0);
2301
2302             // Get a full cursor from `domainsDatabaseHelper`.
2303             Cursor domainNameCursor = domainsDatabaseHelper.getDomainNameCursorOrderedByDomain();
2304
2305             // Initialize `domainSettingsSet`.
2306             Set<String> domainSettingsSet = new HashSet<>();
2307
2308             // Get the domain name column index.
2309             int domainNameColumnIndex = domainNameCursor.getColumnIndex(DomainsDatabaseHelper.DOMAIN_NAME);
2310
2311             // Populate `domainSettingsSet`.
2312             for (int i = 0; i < domainNameCursor.getCount(); i++) {
2313                 // Move `domainsCursor` to the current row.
2314                 domainNameCursor.moveToPosition(i);
2315
2316                 // Store the domain name in `domainSettingsSet`.
2317                 domainSettingsSet.add(domainNameCursor.getString(domainNameColumnIndex));
2318             }
2319
2320             // Close `domainNameCursor.
2321             domainNameCursor.close();
2322
2323             // Initialize variables to track if domain settings will be applied and, if so, under which name.
2324             domainSettingsApplied = false;
2325             String domainNameInDatabase = null;
2326
2327             // Check the hostname.
2328             if (domainSettingsSet.contains(hostName)) {
2329                 domainSettingsApplied = true;
2330                 domainNameInDatabase = hostName;
2331             }
2332
2333             // If `hostName` is not `null`, check all the subdomains of `hostName` against wildcard domains in `domainCursor`.
2334             if (hostName != null) {
2335                 while (hostName.contains(".") && !domainSettingsApplied) {  // Stop checking if we run out of  `.` or if we already know that `domainSettingsApplied` is `true`.
2336                     if (domainSettingsSet.contains("*." + hostName)) {  // Check the host name prepended by `*.`.
2337                         domainSettingsApplied = true;
2338                         domainNameInDatabase = "*." + hostName;
2339                     }
2340
2341                     // Strip out the lowest subdomain of `host`.
2342                     hostName = hostName.substring(hostName.indexOf(".") + 1);
2343                 }
2344             }
2345
2346             // Get a handle for the shared preference.  `this` references the current context.
2347             SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
2348
2349             if (domainSettingsApplied) {  // The url we are loading has custom domain settings.
2350                 // Get a cursor for the current host and move it to the first position.
2351                 Cursor currentHostDomainSettingsCursor = domainsDatabaseHelper.getCursorForDomainName(domainNameInDatabase);
2352                 currentHostDomainSettingsCursor.moveToFirst();
2353
2354                 // Get the settings from the cursor.
2355                 javaScriptEnabled = (currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_JAVASCRIPT)) == 1);
2356                 firstPartyCookiesEnabled = (currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_FIRST_PARTY_COOKIES)) == 1);
2357                 thirdPartyCookiesEnabled = (currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_THIRD_PARTY_COOKIES)) == 1);
2358                 domStorageEnabled = (currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_DOM_STORAGE)) == 1);
2359                 saveFormDataEnabled = (currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_FORM_DATA)) == 1);
2360                 String userAgentString = currentHostDomainSettingsCursor.getString(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.USER_AGENT));
2361                 int fontSize = currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.FONT_SIZE));
2362                 displayWebpageImagesInt = currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.DISPLAY_IMAGES));
2363
2364                 // Close `currentHostDomainSettingsCursor`.
2365                 currentHostDomainSettingsCursor.close();
2366
2367                 // Apply the domain settings.
2368                 mainWebView.getSettings().setJavaScriptEnabled(javaScriptEnabled);
2369                 cookieManager.setAcceptCookie(firstPartyCookiesEnabled);
2370                 mainWebView.getSettings().setDomStorageEnabled(domStorageEnabled);
2371                 mainWebView.getSettings().setSaveFormData(saveFormDataEnabled);
2372                 mainWebView.getSettings().setTextZoom(fontSize);
2373
2374                 // Set third-party cookies status if API >= 21.
2375                 if (Build.VERSION.SDK_INT >= 21) {
2376                     cookieManager.setAcceptThirdPartyCookies(mainWebView, thirdPartyCookiesEnabled);
2377                 }
2378
2379                 // Set the user agent.
2380                 if (userAgentString.equals("WebView default user agent")) {
2381                     // Set the user agent to `""`, which uses the default value.
2382                     mainWebView.getSettings().setUserAgentString("");
2383                 } else {
2384                     // Use the selected user agent.
2385                     mainWebView.getSettings().setUserAgentString(userAgentString);
2386                 }
2387
2388                 // Set a green background on `urlTextBox` to indicate that custom domain settings are being used.  We have to use the deprecated `.getDrawable()` until the minimum API >= 21.
2389                 urlAppBarRelativeLayout.setBackground(getResources().getDrawable(R.drawable.url_bar_background_green));
2390             } else {  // The URL we are loading does not have custom domain settings.  Load the defaults.
2391                 // Store the values from `sharedPreferences` in variables.
2392                 javaScriptEnabled = sharedPreferences.getBoolean("javascript_enabled", false);
2393                 firstPartyCookiesEnabled = sharedPreferences.getBoolean("first_party_cookies_enabled", false);
2394                 thirdPartyCookiesEnabled = sharedPreferences.getBoolean("third_party_cookies_enabled", false);
2395                 domStorageEnabled = sharedPreferences.getBoolean("dom_storage_enabled", false);
2396                 saveFormDataEnabled = sharedPreferences.getBoolean("save_form_data_enabled", false);
2397                 String userAgentString = sharedPreferences.getString("user_agent", "PrivacyBrowser/1.0");
2398                 String customUserAgentString = sharedPreferences.getString("custom_user_agent", "PrivacyBrowser/1.0");
2399                 String defaultFontSizeString = sharedPreferences.getString("default_font_size", "100");
2400
2401                 // Apply the default settings.
2402                 mainWebView.getSettings().setJavaScriptEnabled(javaScriptEnabled);
2403                 cookieManager.setAcceptCookie(firstPartyCookiesEnabled);
2404                 mainWebView.getSettings().setDomStorageEnabled(domStorageEnabled);
2405                 mainWebView.getSettings().setSaveFormData(saveFormDataEnabled);
2406                 mainWebView.getSettings().setTextZoom(Integer.valueOf(defaultFontSizeString));
2407
2408                 // Set third-party cookies status if API >= 21.
2409                 if (Build.VERSION.SDK_INT >= 21) {
2410                     cookieManager.setAcceptThirdPartyCookies(mainWebView, thirdPartyCookiesEnabled);
2411                 }
2412
2413                 // Set the default user agent.
2414                 switch (userAgentString) {
2415                     case "WebView default user agent":
2416                         // Set the user agent to `""`, which uses the default value.
2417                         mainWebView.getSettings().setUserAgentString("");
2418                         break;
2419
2420                     case "Custom user agent":
2421                         // Set the custom user agent.
2422                         mainWebView.getSettings().setUserAgentString(customUserAgentString);
2423                         break;
2424
2425                     default:
2426                         // Use the selected user agent.
2427                         mainWebView.getSettings().setUserAgentString(userAgentString);
2428                         break;
2429                 }
2430
2431                 // Set a transparent background on `urlTextBox`.  We have to use the deprecated `.getDrawable()` until the minimum API >= 21.
2432                 urlAppBarRelativeLayout.setBackgroundDrawable(getResources().getDrawable(R.drawable.url_bar_background_transparent));
2433             }
2434
2435             // Close `domainsDatabaseHelper`.
2436             domainsDatabaseHelper.close();
2437
2438             // Remove the `onTheFlyDisplayImagesSet` flag and set the display webpage images mode.  `true` indicates that custom domain settings are applied.
2439             onTheFlyDisplayImagesSet = false;
2440             setDisplayWebpageImages();
2441
2442             // Update the privacy icons, but only if `mainMenu` has already been populated.
2443             if (mainMenu != null) {
2444                 updatePrivacyIcons(true);
2445             }
2446         }
2447     }
2448
2449     private void setDisplayWebpageImages() {
2450         if (!onTheFlyDisplayImagesSet) {
2451             if (domainSettingsApplied) {  // Custom domain settings are applied.
2452                 switch (displayWebpageImagesInt) {
2453                     case DomainsDatabaseHelper.DISPLAY_WEBPAGE_IMAGES_SYSTEM_DEFAULT:
2454                         mainWebView.getSettings().setLoadsImagesAutomatically(displayWebpageImagesBoolean);
2455                         break;
2456
2457                     case DomainsDatabaseHelper.DISPLAY_WEBPAGE_IMAGES_ENABLED:
2458                         mainWebView.getSettings().setLoadsImagesAutomatically(true);
2459                         break;
2460
2461                     case DomainsDatabaseHelper.DISPLAY_WEBPAGE_IMAGES_DISABLED:
2462                         mainWebView.getSettings().setLoadsImagesAutomatically(false);
2463                         break;
2464                 }
2465             } else {  // Default settings are applied.
2466                 mainWebView.getSettings().setLoadsImagesAutomatically(displayWebpageImagesBoolean);
2467             }
2468         }
2469     }
2470
2471     private void updatePrivacyIcons(boolean runInvalidateOptionsMenu) {
2472         // Get handles for the icons.
2473         MenuItem privacyIconMenuItem = mainMenu.findItem(R.id.toggle_javascript);
2474         MenuItem firstPartyCookiesIconMenuItem = mainMenu.findItem(R.id.toggle_first_party_cookies);
2475         MenuItem domStorageIconMenuItem = mainMenu.findItem(R.id.toggle_dom_storage);
2476         MenuItem formDataIconMenuItem = mainMenu.findItem(R.id.toggle_save_form_data);
2477
2478         // Update `privacyIcon`.
2479         if (javaScriptEnabled) {  // JavaScript is enabled.
2480             privacyIconMenuItem.setIcon(R.drawable.javascript_enabled);
2481         } else if (firstPartyCookiesEnabled) {  // JavaScript is disabled but cookies are enabled.
2482             privacyIconMenuItem.setIcon(R.drawable.warning);
2483         } else {  // All the dangerous features are disabled.
2484             privacyIconMenuItem.setIcon(R.drawable.privacy_mode);
2485         }
2486
2487         // Update `firstPartyCookiesIcon`.
2488         if (firstPartyCookiesEnabled) {  // First-party cookies are enabled.
2489             firstPartyCookiesIconMenuItem.setIcon(R.drawable.cookies_enabled);
2490         } else {  // First-party cookies are disabled.
2491             firstPartyCookiesIconMenuItem.setIcon(R.drawable.cookies_disabled);
2492         }
2493
2494         // Update `domStorageIcon`.
2495         if (javaScriptEnabled && domStorageEnabled) {  // Both JavaScript and DOM storage are enabled.
2496             domStorageIconMenuItem.setIcon(R.drawable.dom_storage_enabled);
2497         } else if (javaScriptEnabled) {  // JavaScript is enabled but DOM storage is disabled.
2498             domStorageIconMenuItem.setIcon(R.drawable.dom_storage_disabled);
2499         } else {  // JavaScript is disabled, so DOM storage is ghosted.
2500             domStorageIconMenuItem.setIcon(R.drawable.dom_storage_ghosted);
2501         }
2502
2503         // Update `formDataIcon`.
2504         if (saveFormDataEnabled) {  // Form data is enabled.
2505             formDataIconMenuItem.setIcon(R.drawable.form_data_enabled);
2506         } else {  // Form data is disabled.
2507             formDataIconMenuItem.setIcon(R.drawable.form_data_disabled);
2508         }
2509
2510         // `invalidateOptionsMenu` calls `onPrepareOptionsMenu()` and redraws the icons in the `AppBar`.  `this` references the current activity.
2511         if (runInvalidateOptionsMenu) {
2512             ActivityCompat.invalidateOptionsMenu(this);
2513         }
2514     }
2515 }