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
 145     // `navigatingHistory` is used in `onCreate()`, `onNavigationItemSelected()`, and `applyDomainSettings()`.
 146     private boolean navigatingHistory;
 147
 148     // `favoriteIconDefaultBitmap` is used in `onCreate()` and `applyDomainSettings`.
 149     private Bitmap favoriteIconDefaultBitmap;
 150
 151     // `drawerLayout` is used in `onCreate()`, `onNewIntent()`, and `onBackPressed()`.
 152     private DrawerLayout drawerLayout;
 153
 154     // `rootCoordinatorLayout` is used in `onCreate()` and `applyAppSettings()`.
 155     private CoordinatorLayout rootCoordinatorLayout;
 156
 157     // `mainWebView` is used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, `onNavigationItemSelected()`, `onRestart()`, `onCreateContextMenu()`, `findPreviousOnPage()`, `findNextOnPage()`, `closeFindOnPage()`, `loadUrlFromTextBox()`
 158     // and `setDisplayWebpageImages()`.
 159     private WebView mainWebView;
 160
 161     // `fullScreenVideoFrameLayout` is used in `onCreate()` and `onConfigurationChanged()`.
 162     private FrameLayout fullScreenVideoFrameLayout;
 163
 164     // `swipeRefreshLayout` is used in `onCreate()`, `onPrepareOptionsMenu`, and `onRestart()`.
 165     private SwipeRefreshLayout swipeRefreshLayout;
 166
 167     // `urlAppBarRelativeLayout` is used in `onCreate()` and `applyDomainSettings()`.
 168     private RelativeLayout urlAppBarRelativeLayout;
 169
 170     // `favoriteIconImageView` is used in `onCreate()` and `applyDomainSettings()`
 171     private ImageView favoriteIconImageView;
 172
 173     // `cookieManager` is used in `onCreate()`, `onOptionsItemSelected()`, and `onNavigationItemSelected()`, `loadUrlFromTextBox()`, `onDownloadImage()`, `onDownloadFile()`, and `onRestart()`.
 174     private CookieManager cookieManager;
 175
 176     // `customHeader` is used in `onCreate()`, `onOptionsItemSelected()`, `onCreateContextMenu()`, and `loadUrl()`.
 177     private final Map<String, String> customHeaders = new HashMap<>();
 178
 179     // `javaScriptEnabled` is also used in `onCreate()`, `onCreateOptionsMenu()`, `onOptionsItemSelected()`, `loadUrlFromTextBox()`, and `applyAppSettings()`.
 180     // It is `Boolean` instead of `boolean` because `applyAppSettings()` needs to know if it is `null`.
 181     private Boolean javaScriptEnabled;
 182
 183     // `firstPartyCookiesEnabled` is used in `onCreate()`, `onCreateOptionsMenu()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, `onDownloadImage()`, `onDownloadFile()`, and `applyAppSettings()`.
 184     private boolean firstPartyCookiesEnabled;
 185
 186     // `thirdPartyCookiesEnabled` used in `onCreate()`, `onCreateOptionsMenu()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, and `applyAppSettings()`.
 187     private boolean thirdPartyCookiesEnabled;
 188
 189     // `domStorageEnabled` is used in `onCreate()`, `onCreateOptionsMenu()`, `onOptionsItemSelected()`, and `applyAppSettings()`.
 190     private boolean domStorageEnabled;
 191
 192     // `saveFormDataEnabled` is used in `onCreate()`, `onCreateOptionsMenu()`, `onOptionsItemSelected()`, and `applyAppSettings()`.
 193     private boolean saveFormDataEnabled;
 194
 195     // `swipeToRefreshEnabled` is used in `onPrepareOptionsMenu()` and `applyAppSettings()`.
 196     private boolean swipeToRefreshEnabled;
 197
 198     // 'homepage' is used in `onCreate()`, `onNavigationItemSelected()`, and `applyAppSettings()`.
 199     private String homepage;
 200
 201     // `searchURL` is used in `loadURLFromTextBox()` and `applyAppSettings()`.
 202     private String searchURL;
 203
 204     // `adBlockerEnabled` is used in `onCreate()` and `applyAppSettings()`.
 205     private boolean adBlockerEnabled;
 206
 207     // `privacyBrowserRuntime` is used in `onCreate()` and `applyAppSettings()`.
 208     private Runtime privacyBrowserRuntime;
 209
 210     // `incognitoModeEnabled` is used in `onCreate()` and `applyAppSettings()`.
 211     private boolean incognitoModeEnabled;
 212
 213     // `fullScreenBrowsingModeEnabled` is used in `onCreate()` and `applyAppSettings()`.
 214     private boolean fullScreenBrowsingModeEnabled;
 215
 216     // `inFullScreenBrowsingMode` is used in `onCreate()`, `onConfigurationChanged()`, and `applyAppSettings()`.
 217     private boolean inFullScreenBrowsingMode;
 218
 219     // `hideSystemBarsOnFullscreen` is used in `onCreate()` and `applyAppSettings()`.
 220     private boolean hideSystemBarsOnFullscreen;
 221
 222     // `translucentNavigationBarOnFullscreen` is used in `onCreate()` and `applyAppSettings()`.
 223     private boolean translucentNavigationBarOnFullscreen;
 224
 225     // `currentDomainName` is used in `onCreate()`, `onNavigationItemSelected()`, and `applyDomainSettings()`.
 226     private String currentDomainName;
 227
 228     // `waitingForOrbot` is used in `onCreate()` and `applyAppSettings()`.
 229     private boolean waitingForOrbot;
 230
 231     // `domainSettingsApplied` is used in `applyDomainSettings()` and `setDisplayWebpageImages()`.
 232     private boolean domainSettingsApplied;
 233
 234     // `displayWebpageImagesInt` is used in `applyDomainSettings()` and `setDisplayWebpageImages()`.
 235     private int displayWebpageImagesInt;
 236
 237     // `onTheFlyDisplayImagesSet` is used in `applyDomainSettings()` and `setDisplayWebpageImages()`.
 238     private boolean onTheFlyDisplayImagesSet;
 239
 240     // `loadingNewIntentBoolean` is used in `onNewIntent()` and `onRestart()`.
 241     private boolean loadingNewIntentBoolean;
 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         // Set `loadingNewIntentBoolean`.
 915         loadingNewIntentBoolean = true;
 916
 917         // Sets the new intent as the activity intent, so that any future `getIntent()`s pick up this one instead of creating a new activity.
 918         setIntent(intent);
 919
 920         if (intent.getData() != null) {
 921             // Get the intent data and convert it to a string.
 922             final Uri intentUriData = intent.getData();
 923             formattedUrlString = intentUriData.toString();
 924         }
 925
 926         // Close the navigation drawer if it is open.
 927         if (drawerLayout.isDrawerVisible(GravityCompat.START)) {
 928             drawerLayout.closeDrawer(GravityCompat.START);
 929         }
 930
 931         // Load the website.
 932         loadUrl(formattedUrlString);
 933
 934         // Clear the keyboard if displayed and remove the focus on the urlTextBar if it has it.
 935         mainWebView.requestFocus();
 936     }
 937
 938     @Override
 939     public void onRestart() {
 940         super.onRestart();
 941
 942         // Apply the app settings, which may have been changed in `SettingsActivity`.
 943         applyAppSettings();
 944
 945         // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
 946         updatePrivacyIcons(true);
 947
 948         // Set the display webpage images mode.
 949         setDisplayWebpageImages();
 950
 951         // Only reload `mainWebView` if not loading a new intent and not waiting for Orbot.
 952         if (!loadingNewIntentBoolean && !waitingForOrbot) {
 953             // Reload the webpage to remove images if `setDisplayWebpageImages` has turned them off.
 954             mainWebView.reload();
 955         } else if (loadingNewIntentBoolean) {  // Reset `loadingNewIntentBoolean` if this run comes from a new intent.
 956             loadingNewIntentBoolean = false;
 957         }
 958     }
 959
 960     // `onResume()` runs after `onStart()`, which runs after `onCreate()` and `onRestart()`.
 961     @Override
 962     public void onResume() {
 963         super.onResume();
 964
 965         // Resume JavaScript (if enabled).
 966         mainWebView.resumeTimers();
 967
 968         // Resume `mainWebView`.
 969         mainWebView.onResume();
 970
 971         // Resume the adView for the free flavor.
 972         if (BuildConfig.FLAVOR.contentEquals("free")) {
 973             BannerAd.resumeAd(adView);
 974         }
 975     }
 976
 977     @Override
 978     public void onPause() {
 979         // Pause `mainWebView`.
 980         mainWebView.onPause();
 981
 982         // Stop all JavaScript.
 983         mainWebView.pauseTimers();
 984
 985         // Pause the adView or it will continue to consume resources in the background on the free flavor.
 986         if (BuildConfig.FLAVOR.contentEquals("free")) {
 987             BannerAd.pauseAd(adView);
 988         }
 989
 990         super.onPause();
 991     }
 992
 993     @Override
 994     public boolean onCreateOptionsMenu(Menu menu) {
 995         // Inflate the menu; this adds items to the action bar if it is present.
 996         getMenuInflater().inflate(R.menu.webview_options_menu, menu);
 997
 998         // Set mainMenu so it can be used by `onOptionsItemSelected()` and `updatePrivacyIcons`.
 999         mainMenu = menu;
1000
1001         // Set the initial status of the privacy icons.  `false` does not call `invalidateOptionsMenu` as the last step.
1002         updatePrivacyIcons(false);
1003
1004         // Get handles for the menu items.
1005         MenuItem toggleFirstPartyCookiesMenuItem = menu.findItem(R.id.toggle_first_party_cookies);
1006         MenuItem toggleThirdPartyCookiesMenuItem = menu.findItem(R.id.toggle_third_party_cookies);
1007         MenuItem toggleDomStorageMenuItem = menu.findItem(R.id.toggle_dom_storage);
1008         MenuItem toggleSaveFormDataMenuItem = menu.findItem(R.id.toggle_save_form_data);
1009
1010         // Only display third-party cookies if SDK >= 21
1011         toggleThirdPartyCookiesMenuItem.setVisible(Build.VERSION.SDK_INT >= 21);
1012
1013         // Get the shared preference values.  `this` references the current context.
1014         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
1015
1016         // Set the status of the additional app bar icons.  The default is `false`.
1017         if (sharedPreferences.getBoolean("display_additional_app_bar_icons", false)) {
1018             toggleFirstPartyCookiesMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
1019             toggleDomStorageMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
1020             toggleSaveFormDataMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
1021         } else { //Do not display the additional icons.
1022             toggleFirstPartyCookiesMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
1023             toggleDomStorageMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
1024             toggleSaveFormDataMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
1025         }
1026
1027         return true;
1028     }
1029
1030     @Override
1031     public boolean onPrepareOptionsMenu(Menu menu) {
1032         // Get handles for the menu items.
1033         MenuItem toggleFirstPartyCookiesMenuItem = menu.findItem(R.id.toggle_first_party_cookies);
1034         MenuItem toggleThirdPartyCookiesMenuItem = menu.findItem(R.id.toggle_third_party_cookies);
1035         MenuItem toggleDomStorageMenuItem = menu.findItem(R.id.toggle_dom_storage);
1036         MenuItem toggleSaveFormDataMenuItem = menu.findItem(R.id.toggle_save_form_data);
1037         MenuItem clearCookiesMenuItem = menu.findItem(R.id.clear_cookies);
1038         MenuItem clearFormDataMenuItem = menu.findItem(R.id.clear_form_data);
1039         MenuItem fontSizeMenuItem = menu.findItem(R.id.font_size);
1040         MenuItem displayImagesMenuItem = menu.findItem(R.id.display_images);
1041         MenuItem refreshMenuItem = menu.findItem(R.id.refresh);
1042
1043         // Set the status of the menu item checkboxes.
1044         toggleFirstPartyCookiesMenuItem.setChecked(firstPartyCookiesEnabled);
1045         toggleThirdPartyCookiesMenuItem.setChecked(thirdPartyCookiesEnabled);
1046         toggleDomStorageMenuItem.setChecked(domStorageEnabled);
1047         toggleSaveFormDataMenuItem.setChecked(saveFormDataEnabled);
1048         displayImagesMenuItem.setChecked(mainWebView.getSettings().getLoadsImagesAutomatically());
1049
1050         // Enable third-party cookies if first-party cookies are enabled.
1051         toggleThirdPartyCookiesMenuItem.setEnabled(firstPartyCookiesEnabled);
1052
1053         // Enable DOM Storage if JavaScript is enabled.
1054         toggleDomStorageMenuItem.setEnabled(javaScriptEnabled);
1055
1056         // Enable Clear Cookies if there are any.
1057         clearCookiesMenuItem.setEnabled(cookieManager.hasCookies());
1058
1059         // Enable Clear Form Data is there is any.
1060         WebViewDatabase mainWebViewDatabase = WebViewDatabase.getInstance(this);
1061         clearFormDataMenuItem.setEnabled(mainWebViewDatabase.hasFormData());
1062
1063         // Initialize font size variables.
1064         int fontSize = mainWebView.getSettings().getTextZoom();
1065         String fontSizeTitle;
1066         MenuItem selectedFontSizeMenuItem;
1067
1068         // Prepare the font size title and current size menu item.
1069         switch (fontSize) {
1070             case 25:
1071                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.twenty_five_percent);
1072                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_twenty_five_percent);
1073                 break;
1074
1075             case 50:
1076                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.fifty_percent);
1077                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_fifty_percent);
1078                 break;
1079
1080             case 75:
1081                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.seventy_five_percent);
1082                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_seventy_five_percent);
1083                 break;
1084
1085             case 100:
1086                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.one_hundred_percent);
1087                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_percent);
1088                 break;
1089
1090             case 125:
1091                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.one_hundred_twenty_five_percent);
1092                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_twenty_five_percent);
1093                 break;
1094
1095             case 150:
1096                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.one_hundred_fifty_percent);
1097                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_fifty_percent);
1098                 break;
1099
1100             case 175:
1101                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.one_hundred_seventy_five_percent);
1102                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_seventy_five_percent);
1103                 break;
1104
1105             case 200:
1106                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.two_hundred_percent);
1107                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_two_hundred_percent);
1108                 break;
1109
1110             default:
1111                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.one_hundred_percent);
1112                 selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_percent);
1113                 break;
1114         }
1115
1116         // Set the font size title and select the current size menu item.
1117         fontSizeMenuItem.setTitle(fontSizeTitle);
1118         selectedFontSizeMenuItem.setChecked(true);
1119
1120         // Only show `Refresh` if `swipeToRefresh` is disabled.
1121         refreshMenuItem.setVisible(!swipeToRefreshEnabled);
1122
1123         // Run all the other default commands.
1124         super.onPrepareOptionsMenu(menu);
1125
1126         // `return true` displays the menu.
1127         return true;
1128     }
1129
1130     @Override
1131     // Remove Android Studio's warning about the dangers of using SetJavaScriptEnabled.
1132     @SuppressLint("SetJavaScriptEnabled")
1133     // removeAllCookies is deprecated, but it is required for API < 21.
1134     @SuppressWarnings("deprecation")
1135     public boolean onOptionsItemSelected(MenuItem menuItem) {
1136         int menuItemId = menuItem.getItemId();
1137
1138         // Set the commands that relate to the menu entries.
1139         switch (menuItemId) {
1140             case R.id.toggle_javascript:
1141                 // Switch the status of javaScriptEnabled.
1142                 javaScriptEnabled = !javaScriptEnabled;
1143
1144                 // Apply the new JavaScript status.
1145                 mainWebView.getSettings().setJavaScriptEnabled(javaScriptEnabled);
1146
1147                 // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
1148                 updatePrivacyIcons(true);
1149
1150                 // Display a `Snackbar`.
1151                 if (javaScriptEnabled) {  // JavaScrip is enabled.
1152                     Snackbar.make(findViewById(R.id.main_webview), R.string.javascript_enabled, Snackbar.LENGTH_SHORT).show();
1153                 } else if (firstPartyCookiesEnabled) {  // JavaScript is disabled, but first-party cookies are enabled.
1154                     Snackbar.make(findViewById(R.id.main_webview), R.string.javascript_disabled, Snackbar.LENGTH_SHORT).show();
1155                 } else {  // Privacy mode.
1156                     Snackbar.make(findViewById(R.id.main_webview), R.string.privacy_mode, Snackbar.LENGTH_SHORT).show();
1157                 }
1158
1159                 // Reload the WebView.
1160                 mainWebView.reload();
1161                 return true;
1162
1163             case R.id.toggle_first_party_cookies:
1164                 // Switch the status of firstPartyCookiesEnabled.
1165                 firstPartyCookiesEnabled = !firstPartyCookiesEnabled;
1166
1167                 // Update the menu checkbox.
1168                 menuItem.setChecked(firstPartyCookiesEnabled);
1169
1170                 // Apply the new cookie status.
1171                 cookieManager.setAcceptCookie(firstPartyCookiesEnabled);
1172
1173                 // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
1174                 updatePrivacyIcons(true);
1175
1176                 // Display a `Snackbar`.
1177                 if (firstPartyCookiesEnabled) {  // First-party cookies are enabled.
1178                     Snackbar.make(findViewById(R.id.main_webview), R.string.first_party_cookies_enabled, Snackbar.LENGTH_SHORT).show();
1179                 } else if (javaScriptEnabled){  // JavaScript is still enabled.
1180                     Snackbar.make(findViewById(R.id.main_webview), R.string.first_party_cookies_disabled, Snackbar.LENGTH_SHORT).show();
1181                 } else {  // Privacy mode.
1182                     Snackbar.make(findViewById(R.id.main_webview), R.string.privacy_mode, Snackbar.LENGTH_SHORT).show();
1183                 }
1184
1185                 // Reload the WebView.
1186                 mainWebView.reload();
1187                 return true;
1188
1189             case R.id.toggle_third_party_cookies:
1190                 if (Build.VERSION.SDK_INT >= 21) {
1191                     // Switch the status of thirdPartyCookiesEnabled.
1192                     thirdPartyCookiesEnabled = !thirdPartyCookiesEnabled;
1193
1194                     // Update the menu checkbox.
1195                     menuItem.setChecked(thirdPartyCookiesEnabled);
1196
1197                     // Apply the new cookie status.
1198                     cookieManager.setAcceptThirdPartyCookies(mainWebView, thirdPartyCookiesEnabled);
1199
1200                     // Display a `Snackbar`.
1201                     if (thirdPartyCookiesEnabled) {
1202                         Snackbar.make(findViewById(R.id.main_webview), R.string.third_party_cookies_enabled, Snackbar.LENGTH_SHORT).show();
1203                     } else {
1204                         Snackbar.make(findViewById(R.id.main_webview), R.string.third_party_cookies_disabled, Snackbar.LENGTH_SHORT).show();
1205                     }
1206
1207                     // Reload the WebView.
1208                     mainWebView.reload();
1209                 } // Else do nothing because SDK < 21.
1210                 return true;
1211
1212             case R.id.toggle_dom_storage:
1213                 // Switch the status of domStorageEnabled.
1214                 domStorageEnabled = !domStorageEnabled;
1215
1216                 // Update the menu checkbox.
1217                 menuItem.setChecked(domStorageEnabled);
1218
1219                 // Apply the new DOM Storage status.
1220                 mainWebView.getSettings().setDomStorageEnabled(domStorageEnabled);
1221
1222                 // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
1223                 updatePrivacyIcons(true);
1224
1225                 // Display a `Snackbar`.
1226                 if (domStorageEnabled) {
1227                     Snackbar.make(findViewById(R.id.main_webview), R.string.dom_storage_enabled, Snackbar.LENGTH_SHORT).show();
1228                 } else {
1229                     Snackbar.make(findViewById(R.id.main_webview), R.string.dom_storage_disabled, Snackbar.LENGTH_SHORT).show();
1230                 }
1231
1232                 // Reload the WebView.
1233                 mainWebView.reload();
1234                 return true;
1235
1236             case R.id.toggle_save_form_data:
1237                 // Switch the status of saveFormDataEnabled.
1238                 saveFormDataEnabled = !saveFormDataEnabled;
1239
1240                 // Update the menu checkbox.
1241                 menuItem.setChecked(saveFormDataEnabled);
1242
1243                 // Apply the new form data status.
1244                 mainWebView.getSettings().setSaveFormData(saveFormDataEnabled);
1245
1246                 // Display a `Snackbar`.
1247                 if (saveFormDataEnabled) {
1248                     Snackbar.make(findViewById(R.id.main_webview), R.string.form_data_enabled, Snackbar.LENGTH_SHORT).show();
1249                 } else {
1250                     Snackbar.make(findViewById(R.id.main_webview), R.string.form_data_disabled, Snackbar.LENGTH_SHORT).show();
1251                 }
1252
1253                 // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
1254                 updatePrivacyIcons(true);
1255
1256                 // Reload the WebView.
1257                 mainWebView.reload();
1258                 return true;
1259
1260             case R.id.clear_cookies:
1261                 Snackbar.make(findViewById(R.id.main_webview), R.string.cookies_deleted, Snackbar.LENGTH_LONG)
1262                         .setAction(R.string.undo, new View.OnClickListener() {
1263                             @Override
1264                             public void onClick(View v) {
1265                                 // Do nothing because everything will be handled by `onDismissed()` below.
1266                             }
1267                         })
1268                         .addCallback(new Snackbar.Callback() {
1269                             @Override
1270                             public void onDismissed(Snackbar snackbar, int event) {
1271                                 switch (event) {
1272                                     // The user pushed the `Undo` button.
1273                                     case Snackbar.Callback.DISMISS_EVENT_ACTION:
1274                                         // Do nothing.
1275                                         break;
1276
1277                                     // The `Snackbar` was dismissed without the `Undo` button being pushed.
1278                                     default:
1279                                         // `cookieManager.removeAllCookie()` varies by SDK.
1280                                         if (Build.VERSION.SDK_INT < 21) {
1281                                             cookieManager.removeAllCookie();
1282                                         } else {
1283                                             // `null` indicates no callback.
1284                                             cookieManager.removeAllCookies(null);
1285                                         }
1286                                 }
1287                             }
1288                         })
1289                         .show();
1290                 return true;
1291
1292             case R.id.clear_dom_storage:
1293                 Snackbar.make(findViewById(R.id.main_webview), R.string.dom_storage_deleted, Snackbar.LENGTH_LONG)
1294                         .setAction(R.string.undo, new View.OnClickListener() {
1295                             @Override
1296                             public void onClick(View v) {
1297                                 // Do nothing because everything will be handled by `onDismissed()` below.
1298                             }
1299                         })
1300                         .addCallback(new Snackbar.Callback() {
1301                             @Override
1302                             public void onDismissed(Snackbar snackbar, int event) {
1303                                 switch (event) {
1304                                     // The user pushed the `Undo` button.
1305                                     case Snackbar.Callback.DISMISS_EVENT_ACTION:
1306                                         // Do nothing.
1307                                         break;
1308
1309                                     // The `Snackbar` was dismissed without the `Undo` button being pushed.
1310                                     default:
1311                                         // Delete the DOM Storage.
1312                                         WebStorage webStorage = WebStorage.getInstance();
1313                                         webStorage.deleteAllData();
1314                                 }
1315                             }
1316                         })
1317                         .show();
1318                 return true;
1319
1320             case R.id.clear_form_data:
1321                 Snackbar.make(findViewById(R.id.main_webview), R.string.form_data_deleted, Snackbar.LENGTH_LONG)
1322                         .setAction(R.string.undo, new View.OnClickListener() {
1323                             @Override
1324                             public void onClick(View v) {
1325                                 // Do nothing because everything will be handled by `onDismissed()` below.
1326                             }
1327                         })
1328                         .addCallback(new Snackbar.Callback() {
1329                             @Override
1330                             public void onDismissed(Snackbar snackbar, int event) {
1331                                 switch (event) {
1332                                     // The user pushed the `Undo` button.
1333                                     case Snackbar.Callback.DISMISS_EVENT_ACTION:
1334                                         // Do nothing.
1335                                         break;
1336
1337                                     // The `Snackbar` was dismissed without the `Undo` button being pushed.
1338                                     default:
1339                                         // Delete the form data.
1340                                         WebViewDatabase mainWebViewDatabase = WebViewDatabase.getInstance(getApplicationContext());
1341                                         mainWebViewDatabase.clearFormData();
1342                                 }
1343                             }
1344                         })
1345                         .show();
1346                 return true;
1347
1348             case R.id.font_size_twenty_five_percent:
1349                 mainWebView.getSettings().setTextZoom(25);
1350                 return true;
1351
1352             case R.id.font_size_fifty_percent:
1353                 mainWebView.getSettings().setTextZoom(50);
1354                 return true;
1355
1356             case R.id.font_size_seventy_five_percent:
1357                 mainWebView.getSettings().setTextZoom(75);
1358                 return true;
1359
1360             case R.id.font_size_one_hundred_percent:
1361                 mainWebView.getSettings().setTextZoom(100);
1362                 return true;
1363
1364             case R.id.font_size_one_hundred_twenty_five_percent:
1365                 mainWebView.getSettings().setTextZoom(125);
1366                 return true;
1367
1368             case R.id.font_size_one_hundred_fifty_percent:
1369                 mainWebView.getSettings().setTextZoom(150);
1370                 return true;
1371
1372             case R.id.font_size_one_hundred_seventy_five_percent:
1373                 mainWebView.getSettings().setTextZoom(175);
1374                 return true;
1375
1376             case R.id.font_size_two_hundred_percent:
1377                 mainWebView.getSettings().setTextZoom(200);
1378                 return true;
1379
1380             case R.id.display_images:
1381                 if (mainWebView.getSettings().getLoadsImagesAutomatically()) {  // Images are currently loaded automatically.
1382                     mainWebView.getSettings().setLoadsImagesAutomatically(false);
1383                     mainWebView.reload();
1384                 } else {  // Images are not currently loaded automatically.
1385                     mainWebView.getSettings().setLoadsImagesAutomatically(true);
1386                 }
1387
1388                 // Set `onTheFlyDisplayImagesSet`.
1389                 onTheFlyDisplayImagesSet = true;
1390                 return true;
1391
1392             case R.id.share:
1393                 // Setup the share string.
1394                 String shareString;
1395                 if (webViewTitle != null) {
1396                     shareString = webViewTitle + " – " + urlTextBox.getText().toString();
1397                 } else {
1398                     shareString = urlTextBox.getText().toString();
1399                 }
1400
1401                 // Create the share intent.
1402                 Intent shareIntent = new Intent();
1403                 shareIntent.setAction(Intent.ACTION_SEND);
1404                 shareIntent.putExtra(Intent.EXTRA_TEXT, shareString);
1405                 shareIntent.setType("text/plain");
1406
1407                 // Make it so.
1408                 startActivity(Intent.createChooser(shareIntent, "Share URL"));
1409                 return true;
1410
1411             case R.id.find_on_page:
1412                 // Hide the URL app bar.
1413                 supportAppBar.setVisibility(View.GONE);
1414
1415                 // Show the Find on Page `RelativeLayout`.
1416                 findOnPageLinearLayout.setVisibility(View.VISIBLE);
1417
1418                 // Display the keyboard.  We have to wait 200 ms before running the command to work around a bug in Android.
1419                 // http://stackoverflow.com/questions/5520085/android-show-softkeyboard-with-showsoftinput-is-not-working
1420                 findOnPageEditText.postDelayed(new Runnable()
1421                 {
1422                     @Override
1423                     public void run()
1424                     {
1425                         // Set the focus on `findOnPageEditText`.
1426                         findOnPageEditText.requestFocus();
1427
1428                         // Display the keyboard.
1429                         inputMethodManager.showSoftInput(findOnPageEditText, 0);
1430                     }
1431                 }, 200);
1432                 return true;
1433
1434             case R.id.print:
1435                 // Get a `PrintManager` instance.
1436                 PrintManager printManager = (PrintManager) getSystemService(Context.PRINT_SERVICE);
1437
1438                 // Convert `mainWebView` to `printDocumentAdapter`.
1439                 PrintDocumentAdapter printDocumentAdapter = mainWebView.createPrintDocumentAdapter();
1440
1441                 // Print the document.  The print attributes are `null`.
1442                 printManager.print(getResources().getString(R.string.privacy_browser_web_page), printDocumentAdapter, null);
1443                 return true;
1444
1445             case R.id.add_to_homescreen:
1446                 // Show the `CreateHomeScreenShortcutDialog` `AlertDialog` and name this instance `R.string.create_shortcut`.
1447                 AppCompatDialogFragment createHomeScreenShortcutDialogFragment = new CreateHomeScreenShortcutDialog();
1448                 createHomeScreenShortcutDialogFragment.show(getSupportFragmentManager(), getResources().getString(R.string.create_shortcut));
1449
1450                 //Everything else will be handled by `CreateHomeScreenShortcutDialog` and the associated listener below.
1451                 return true;
1452
1453             case R.id.refresh:
1454                 mainWebView.reload();
1455                 return true;
1456
1457             default:
1458                 // Don't consume the event.
1459                 return super.onOptionsItemSelected(menuItem);
1460         }
1461     }
1462
1463     // removeAllCookies is deprecated, but it is required for API < 21.
1464     @SuppressWarnings("deprecation")
1465     @Override
1466     public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
1467         int menuItemId = menuItem.getItemId();
1468
1469         switch (menuItemId) {
1470             case R.id.home:
1471                 loadUrl(homepage);
1472                 break;
1473
1474             case R.id.back:
1475                 if (mainWebView.canGoBack()) {
1476                     // Set `navigatingHistory` so that the domain settings are applied when the new URL is loaded.
1477                     navigatingHistory = true;
1478
1479                     // Load the previous website in the history.
1480                     mainWebView.goBack();
1481                 }
1482                 break;
1483
1484             case R.id.forward:
1485                 if (mainWebView.canGoForward()) {
1486                     // Set `navigatingHistory` so that the domain settings are applied when the new URL is loaded.
1487                     navigatingHistory = true;
1488
1489                     // Load the next website in the history.
1490                     mainWebView.goForward();
1491                 }
1492                 break;
1493
1494             case R.id.history:
1495                 // Get the `WebBackForwardList`.
1496                 WebBackForwardList webBackForwardList = mainWebView.copyBackForwardList();
1497
1498                 // Show the `UrlHistoryDialog` `AlertDialog` and name this instance `R.string.history`.  `this` is the `Context`.
1499                 AppCompatDialogFragment urlHistoryDialogFragment = UrlHistoryDialog.loadBackForwardList(this, webBackForwardList);
1500                 urlHistoryDialogFragment.show(getSupportFragmentManager(), getResources().getString(R.string.history));
1501                 break;
1502
1503             case R.id.bookmarks:
1504                 // Launch BookmarksActivity.
1505                 Intent bookmarksIntent = new Intent(this, BookmarksActivity.class);
1506                 startActivity(bookmarksIntent);
1507                 break;
1508
1509             case R.id.downloads:
1510                 // Launch the system Download Manager.
1511                 Intent downloadManagerIntent = new Intent(DownloadManager.ACTION_VIEW_DOWNLOADS);
1512
1513                 // Launch as a new task so that Download Manager and Privacy Browser show as separate windows in the recent tasks list.
1514                 downloadManagerIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
1515
1516                 startActivity(downloadManagerIntent);
1517                 break;
1518
1519             case R.id.settings:
1520                 // Reset `currentDomainName` so that domain settings are reapplied after returning to `MainWebViewActivity`.
1521                 currentDomainName = "";
1522
1523                 // Launch `SettingsActivity`.
1524                 Intent settingsIntent = new Intent(this, SettingsActivity.class);
1525                 startActivity(settingsIntent);
1526                 break;
1527
1528             case R.id.domains:
1529                 // Reset `currentDomainName` so that domain settings are reapplied after returning to `MainWebViewActivity`.
1530                 currentDomainName = "";
1531
1532                 // Launch `DomainsActivity`.
1533                 Intent domainsIntent = new Intent(this, DomainsActivity.class);
1534                 startActivity(domainsIntent);
1535                 break;
1536
1537             case R.id.guide:
1538                 // Launch `GuideActivity`.
1539                 Intent guideIntent = new Intent(this, GuideActivity.class);
1540                 startActivity(guideIntent);
1541                 break;
1542
1543             case R.id.about:
1544                 // Launch `AboutActivity`.
1545                 Intent aboutIntent = new Intent(this, AboutActivity.class);
1546                 startActivity(aboutIntent);
1547                 break;
1548
1549             case R.id.clearAndExit:
1550                 // Clear cookies.  The commands changed slightly in API 21.
1551                 if (Build.VERSION.SDK_INT >= 21) {
1552                     cookieManager.removeAllCookies(null);
1553                 } else {
1554                     cookieManager.removeAllCookie();
1555                 }
1556
1557                 // Clear DOM storage.
1558                 WebStorage domStorage = WebStorage.getInstance();
1559                 domStorage.deleteAllData();
1560
1561                 // Clear form data.
1562                 WebViewDatabase webViewDatabase = WebViewDatabase.getInstance(this);
1563                 webViewDatabase.clearFormData();
1564
1565                 // Clear the cache.  `true` includes disk files.
1566                 mainWebView.clearCache(true);
1567
1568                 // Clear the back/forward history.
1569                 mainWebView.clearHistory();
1570
1571                 // Clear any SSL certificate preferences.
1572                 mainWebView.clearSslPreferences();
1573
1574                 // Clear `formattedUrlString`.
1575                 formattedUrlString = null;
1576
1577                 // Clear `customHeaders`.
1578                 customHeaders.clear();
1579
1580                 // Detach all views from `mainWebViewRelativeLayout`.
1581                 mainWebViewRelativeLayout.removeAllViews();
1582
1583                 // Destroy the internal state of `mainWebView`.
1584                 mainWebView.destroy();
1585
1586                 // Manually delete cache folders.
1587                 try {
1588                     // Delete the main `cache` folder.
1589                     privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/cache");
1590
1591                     // 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`.
1592                     privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/app_webview");
1593                 } catch (IOException e) {
1594                     // Do nothing if an error is thrown.
1595                 }
1596
1597                 // Close Privacy Browser.  `finishAndRemoveTask` also removes Privacy Browser from the recent app list.
1598                 if (Build.VERSION.SDK_INT >= 21) {
1599                     finishAndRemoveTask();
1600                 } else {
1601                     finish();
1602                 }
1603
1604                 // Remove the terminated program from RAM.  The status code is `0`.
1605                 System.exit(0);
1606                 break;
1607
1608             default:
1609                 break;
1610         }
1611
1612         // Close the navigation drawer.
1613         drawerLayout.closeDrawer(GravityCompat.START);
1614         return true;
1615     }
1616
1617     @Override
1618     public void onPostCreate(Bundle savedInstanceState) {
1619         super.onPostCreate(savedInstanceState);
1620
1621         // Sync the state of the DrawerToggle after onRestoreInstanceState has finished.
1622         drawerToggle.syncState();
1623     }
1624
1625     @Override
1626     public void onConfigurationChanged(Configuration newConfig) {
1627         super.onConfigurationChanged(newConfig);
1628
1629         // Reload the ad for the free flavor if we are not in full screen mode.
1630         if (BuildConfig.FLAVOR.contentEquals("free") && !inFullScreenBrowsingMode) {
1631             // Reload the ad.
1632             BannerAd.reloadAfterRotate(adView, getApplicationContext(), getString(R.string.ad_id));
1633
1634             // Reinitialize the `adView` variable, as the `View` will have been removed and re-added by `BannerAd.reloadAfterRotate()`.
1635             adView = findViewById(R.id.adview);
1636         }
1637
1638         // `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
1639         // ActivityCompat.invalidateOptionsMenu(this);
1640     }
1641
1642     @Override
1643     public void onCreateContextMenu(ContextMenu menu, View view, ContextMenu.ContextMenuInfo menuInfo) {
1644         // Store the `HitTestResult`.
1645         final WebView.HitTestResult hitTestResult = mainWebView.getHitTestResult();
1646
1647         // Create strings.
1648         final String imageUrl;
1649         final String linkUrl;
1650
1651         // Get a handle for the `ClipboardManager`.
1652         final ClipboardManager clipboardManager = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
1653
1654         switch (hitTestResult.getType()) {
1655             // `SRC_ANCHOR_TYPE` is a link.
1656             case WebView.HitTestResult.SRC_ANCHOR_TYPE:
1657                 // Get the target URL.
1658                 linkUrl = hitTestResult.getExtra();
1659
1660                 // Set the target URL as the title of the `ContextMenu`.
1661                 menu.setHeaderTitle(linkUrl);
1662
1663                 // Add a `Load URL` entry.
1664                 menu.add(R.string.load_url).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1665                     @Override
1666                     public boolean onMenuItemClick(MenuItem item) {
1667                         loadUrl(linkUrl);
1668                         return false;
1669                     }
1670                 });
1671
1672                 // Add a `Copy URL` entry.
1673                 menu.add(R.string.copy_url).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1674                     @Override
1675                     public boolean onMenuItemClick(MenuItem item) {
1676                         // Save the link URL in a `ClipData`.
1677                         ClipData srcAnchorTypeClipData = ClipData.newPlainText(getResources().getString(R.string.url), linkUrl);
1678
1679                         // Set the `ClipData` as the clipboard's primary clip.
1680                         clipboardManager.setPrimaryClip(srcAnchorTypeClipData);
1681                         return false;
1682                     }
1683                 });
1684
1685                 // Add a `Cancel` entry, which by default closes the `ContextMenu`.
1686                 menu.add(R.string.cancel);
1687                 break;
1688
1689             case WebView.HitTestResult.EMAIL_TYPE:
1690                 // Get the target URL.
1691                 linkUrl = hitTestResult.getExtra();
1692
1693                 // Set the target URL as the title of the `ContextMenu`.
1694                 menu.setHeaderTitle(linkUrl);
1695
1696                 // Add a `Write Email` entry.
1697                 menu.add(R.string.write_email).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1698                     @Override
1699                     public boolean onMenuItemClick(MenuItem item) {
1700                         // We use `ACTION_SENDTO` instead of `ACTION_SEND` so that only email programs are launched.
1701                         Intent emailIntent = new Intent(Intent.ACTION_SENDTO);
1702
1703                         // Parse the url and set it as the data for the `Intent`.
1704                         emailIntent.setData(Uri.parse("mailto:" + linkUrl));
1705
1706                         // `FLAG_ACTIVITY_NEW_TASK` opens the email program in a new task instead as part of Privacy Browser.
1707                         emailIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
1708
1709                         // Make it so.
1710                         startActivity(emailIntent);
1711                         return false;
1712                     }
1713                 });
1714
1715                 // Add a `Copy Email Address` entry.
1716                 menu.add(R.string.copy_email_address).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1717                     @Override
1718                     public boolean onMenuItemClick(MenuItem item) {
1719                         // Save the email address in a `ClipData`.
1720                         ClipData srcEmailTypeClipData = ClipData.newPlainText(getResources().getString(R.string.email_address), linkUrl);
1721
1722                         // Set the `ClipData` as the clipboard's primary clip.
1723                         clipboardManager.setPrimaryClip(srcEmailTypeClipData);
1724                         return false;
1725                     }
1726                 });
1727
1728                 // Add a `Cancel` entry, which by default closes the `ContextMenu`.
1729                 menu.add(R.string.cancel);
1730                 break;
1731
1732             // `IMAGE_TYPE` is an image.
1733             case WebView.HitTestResult.IMAGE_TYPE:
1734                 // Get the image URL.
1735                 imageUrl = hitTestResult.getExtra();
1736
1737                 // Set the image URL as the title of the `ContextMenu`.
1738                 menu.setHeaderTitle(imageUrl);
1739
1740                 // Add a `View Image` entry.
1741                 menu.add(R.string.view_image).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1742                     @Override
1743                     public boolean onMenuItemClick(MenuItem item) {
1744                         loadUrl(imageUrl);
1745                         return false;
1746                     }
1747                 });
1748
1749                 // Add a `Download Image` entry.
1750                 menu.add(R.string.download_image).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1751                     @Override
1752                     public boolean onMenuItemClick(MenuItem item) {
1753                         // Show the `DownloadImageDialog` `AlertDialog` and name this instance `@string/download`.
1754                         AppCompatDialogFragment downloadImageDialogFragment = DownloadImageDialog.imageUrl(imageUrl);
1755                         downloadImageDialogFragment.show(getSupportFragmentManager(), getResources().getString(R.string.download));
1756                         return false;
1757                     }
1758                 });
1759
1760                 // Add a `Copy URL` entry.
1761                 menu.add(R.string.copy_url).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1762                     @Override
1763                     public boolean onMenuItemClick(MenuItem item) {
1764                         // Save the image URL in a `ClipData`.
1765                         ClipData srcImageTypeClipData = ClipData.newPlainText(getResources().getString(R.string.url), imageUrl);
1766
1767                         // Set the `ClipData` as the clipboard's primary clip.
1768                         clipboardManager.setPrimaryClip(srcImageTypeClipData);
1769                         return false;
1770                     }
1771                 });
1772
1773                 // Add a `Cancel` entry, which by default closes the `ContextMenu`.
1774                 menu.add(R.string.cancel);
1775                 break;
1776
1777
1778             // `SRC_IMAGE_ANCHOR_TYPE` is an image that is also a link.
1779             case WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE:
1780                 // Get the image URL.
1781                 imageUrl = hitTestResult.getExtra();
1782
1783                 // Set the image URL as the title of the `ContextMenu`.
1784                 menu.setHeaderTitle(imageUrl);
1785
1786                 // Add a `View Image` entry.
1787                 menu.add(R.string.view_image).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1788                     @Override
1789                     public boolean onMenuItemClick(MenuItem item) {
1790                         loadUrl(imageUrl);
1791                         return false;
1792                     }
1793                 });
1794
1795                 // Add a `Download Image` entry.
1796                 menu.add(R.string.download_image).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1797                     @Override
1798                     public boolean onMenuItemClick(MenuItem item) {
1799                         // Show the `DownloadImageDialog` `AlertDialog` and name this instance `@string/download`.
1800                         AppCompatDialogFragment downloadImageDialogFragment = DownloadImageDialog.imageUrl(imageUrl);
1801                         downloadImageDialogFragment.show(getSupportFragmentManager(), getResources().getString(R.string.download));
1802                         return false;
1803                     }
1804                 });
1805
1806                 // Add a `Copy URL` entry.
1807                 menu.add(R.string.copy_url).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1808                     @Override
1809                     public boolean onMenuItemClick(MenuItem item) {
1810                         // Save the image URL in a `ClipData`.
1811                         ClipData srcImageAnchorTypeClipData = ClipData.newPlainText(getResources().getString(R.string.url), imageUrl);
1812
1813                         // Set the `ClipData` as the clipboard's primary clip.
1814                         clipboardManager.setPrimaryClip(srcImageAnchorTypeClipData);
1815                         return false;
1816                     }
1817                 });
1818
1819                 // Add a `Cancel` entry, which by default closes the `ContextMenu`.
1820                 menu.add(R.string.cancel);
1821                 break;
1822         }
1823     }
1824
1825     @Override
1826     public void onCreateHomeScreenShortcut(AppCompatDialogFragment dialogFragment) {
1827         // Get shortcutNameEditText from the alert dialog.
1828         EditText shortcutNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.shortcut_name_edittext);
1829
1830         // Create the bookmark shortcut based on formattedUrlString.
1831         Intent bookmarkShortcut = new Intent();
1832         bookmarkShortcut.setAction(Intent.ACTION_VIEW);
1833         bookmarkShortcut.setData(Uri.parse(formattedUrlString));
1834
1835         // Place the bookmark shortcut on the home screen.
1836         Intent placeBookmarkShortcut = new Intent();
1837         placeBookmarkShortcut.putExtra("android.intent.extra.shortcut.INTENT", bookmarkShortcut);
1838         placeBookmarkShortcut.putExtra("android.intent.extra.shortcut.NAME", shortcutNameEditText.getText().toString());
1839         placeBookmarkShortcut.putExtra("android.intent.extra.shortcut.ICON", favoriteIconBitmap);
1840         placeBookmarkShortcut.setAction("com.android.launcher.action.INSTALL_SHORTCUT");
1841         sendBroadcast(placeBookmarkShortcut);
1842     }
1843
1844     @Override
1845     public void onDownloadImage(AppCompatDialogFragment dialogFragment, String imageUrl) {
1846         // Download the image if it has an HTTP or HTTPS URI.
1847         if (imageUrl.startsWith("http")) {
1848             // Get a handle for the system `DOWNLOAD_SERVICE`.
1849             DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
1850
1851             // Parse `imageUrl`.
1852             DownloadManager.Request downloadRequest = new DownloadManager.Request(Uri.parse(imageUrl));
1853
1854             // Pass cookies to download manager if cookies are enabled.  This is required to download images from websites that require a login.
1855             // Code contributed 2017 Hendrik Knackstedt.  Copyright assigned to Soren Stoutner <soren@stoutner.com>.
1856             if (firstPartyCookiesEnabled) {
1857                 // Get the cookies for `imageUrl`.
1858                 String cookies = cookieManager.getCookie(imageUrl);
1859
1860                 // Add the cookies to `downloadRequest`.  In the HTTP request header, cookies are named `Cookie`.
1861                 downloadRequest.addRequestHeader("Cookie", cookies);
1862             }
1863
1864             // Get the file name from `dialogFragment`.
1865             EditText downloadImageNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.download_image_name);
1866             String imageName = downloadImageNameEditText.getText().toString();
1867
1868             // Once we have `WRITE_EXTERNAL_STORAGE` permissions we can use `setDestinationInExternalPublicDir`.
1869             if (Build.VERSION.SDK_INT >= 23) { // If API >= 23, set the download save in the the `DIRECTORY_DOWNLOADS` using `imageName`.
1870                 downloadRequest.setDestinationInExternalFilesDir(this, "/", imageName);
1871             } else { // Only set the title using `imageName`.
1872                 downloadRequest.setTitle(imageName);
1873             }
1874
1875             // Allow `MediaScanner` to index the download if it is a media file.
1876             downloadRequest.allowScanningByMediaScanner();
1877
1878             // Add the URL as the description for the download.
1879             downloadRequest.setDescription(imageUrl);
1880
1881             // Show the download notification after the download is completed.
1882             downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
1883
1884             // Initiate the download.
1885             downloadManager.enqueue(downloadRequest);
1886         } else {  // The image is not an HTTP or HTTPS URI.
1887             Snackbar.make(mainWebView, R.string.cannot_download_image, Snackbar.LENGTH_INDEFINITE).show();
1888         }
1889     }
1890
1891     @Override
1892     public void onDownloadFile(AppCompatDialogFragment dialogFragment, String downloadUrl) {
1893         // Download the file if it has an HTTP or HTTPS URI.
1894         if (downloadUrl.startsWith("http")) {
1895
1896             // Get a handle for the system `DOWNLOAD_SERVICE`.
1897             DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
1898
1899             // Parse `downloadUrl`.
1900             DownloadManager.Request downloadRequest = new DownloadManager.Request(Uri.parse(downloadUrl));
1901
1902             // Pass cookies to download manager if cookies are enabled.  This is required to download files from websites that require a login.
1903             // Code contributed 2017 Hendrik Knackstedt.  Copyright assigned to Soren Stoutner <soren@stoutner.com>.
1904             if (firstPartyCookiesEnabled) {
1905                 // Get the cookies for `downloadUrl`.
1906                 String cookies = cookieManager.getCookie(downloadUrl);
1907
1908                 // Add the cookies to `downloadRequest`.  In the HTTP request header, cookies are named `Cookie`.
1909                 downloadRequest.addRequestHeader("Cookie", cookies);
1910             }
1911
1912             // Get the file name from `dialogFragment`.
1913             EditText downloadFileNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.download_file_name);
1914             String fileName = downloadFileNameEditText.getText().toString();
1915
1916             // Once we have `WRITE_EXTERNAL_STORAGE` permissions we can use `setDestinationInExternalPublicDir`.
1917             if (Build.VERSION.SDK_INT >= 23) { // If API >= 23, set the download location to `/sdcard/Android/data/com.stoutner.privacybrowser.standard/files` named `fileName`.
1918                 downloadRequest.setDestinationInExternalFilesDir(this, "/", fileName);
1919             } else { // Only set the title using `fileName`.
1920                 downloadRequest.setTitle(fileName);
1921             }
1922
1923             // Allow `MediaScanner` to index the download if it is a media file.
1924             downloadRequest.allowScanningByMediaScanner();
1925
1926             // Add the URL as the description for the download.
1927             downloadRequest.setDescription(downloadUrl);
1928
1929             // Show the download notification after the download is completed.
1930             downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
1931
1932             // Initiate the download.
1933             downloadManager.enqueue(downloadRequest);
1934         } else {  // The download is not an HTTP or HTTPS URI.
1935             Snackbar.make(mainWebView, R.string.cannot_download_file, Snackbar.LENGTH_INDEFINITE).show();
1936         }
1937     }
1938
1939     public void viewSslCertificate(View view) {
1940         // Show the `ViewSslCertificateDialog` `AlertDialog` and name this instance `@string/view_ssl_certificate`.
1941         DialogFragment viewSslCertificateDialogFragment = new ViewSslCertificateDialog();
1942         viewSslCertificateDialogFragment.show(getFragmentManager(), getResources().getString(R.string.view_ssl_certificate));
1943     }
1944
1945     @Override
1946     public void onSslErrorCancel() {
1947         sslErrorHandler.cancel();
1948     }
1949
1950     @Override
1951     public void onSslErrorProceed() {
1952         sslErrorHandler.proceed();
1953     }
1954
1955     @Override
1956     public void onUrlHistoryEntrySelected(int moveBackOrForwardSteps) {
1957         // Set `navigatingHistory` so that the domain settings are applied when the new URL is loaded.
1958         navigatingHistory = true;
1959
1960         // Load the history entry.
1961         mainWebView.goBackOrForward(moveBackOrForwardSteps);
1962     }
1963
1964     @Override
1965     public void onClearHistory() {
1966         // Clear the history.
1967         mainWebView.clearHistory();
1968     }
1969
1970     // Override `onBackPressed` to handle the navigation drawer and `mainWebView`.
1971     @Override
1972     public void onBackPressed() {
1973         // Close the navigation drawer if it is available.  GravityCompat.START is the drawer on the left on Left-to-Right layout text.
1974         if (drawerLayout.isDrawerVisible(GravityCompat.START)) {
1975             drawerLayout.closeDrawer(GravityCompat.START);
1976         } else {
1977             // Load the previous URL if available.
1978             if (mainWebView.canGoBack()) {
1979                 // Set `navigatingHistory` so that the domain settings are applied when the new URL is loaded.
1980                 navigatingHistory = true;
1981
1982                 // Go back.
1983                 mainWebView.goBack();
1984             } else {
1985                 // Pass `onBackPressed()` to the system.
1986                 super.onBackPressed();
1987             }
1988         }
1989     }
1990
1991     private void loadUrlFromTextBox() throws UnsupportedEncodingException {
1992         // Get the text from urlTextBox and convert it to a string.  trim() removes white spaces from the beginning and end of the string.
1993         String unformattedUrlString = urlTextBox.getText().toString().trim();
1994
1995         // Check to see if `unformattedUrlString` is a valid URL.  Otherwise, convert it into a search.
1996         if ((Patterns.WEB_URL.matcher(unformattedUrlString).matches()) || (unformattedUrlString.startsWith("http://")) || (unformattedUrlString.startsWith("https://"))) {
1997             // Add `http://` at the beginning if it is missing.  Otherwise the app will segfault.
1998             if (!unformattedUrlString.startsWith("http")) {
1999                 unformattedUrlString = "http://" + unformattedUrlString;
2000             }
2001
2002             // Initialize `unformattedUrl`.
2003             URL unformattedUrl = null;
2004
2005             // 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.
2006             try {
2007                 unformattedUrl = new URL(unformattedUrlString);
2008             } catch (MalformedURLException e) {
2009                 e.printStackTrace();
2010             }
2011
2012             // The ternary operator (? :) makes sure that a null pointer exception is not thrown, which would happen if `.get` was called on a `null` value.
2013             final String scheme = unformattedUrl != null ? unformattedUrl.getProtocol() : null;
2014             final String authority = unformattedUrl != null ? unformattedUrl.getAuthority() : null;
2015             final String path = unformattedUrl != null ? unformattedUrl.getPath() : null;
2016             final String query = unformattedUrl != null ? unformattedUrl.getQuery() : null;
2017             final String fragment = unformattedUrl != null ? unformattedUrl.getRef() : null;
2018
2019             // Build the URI.
2020             Uri.Builder formattedUri = new Uri.Builder();
2021             formattedUri.scheme(scheme).authority(authority).path(path).query(query).fragment(fragment);
2022
2023             // Decode `formattedUri` as a `String` in `UTF-8`.
2024             formattedUrlString = URLDecoder.decode(formattedUri.build().toString(), "UTF-8");
2025         } else {
2026             // Sanitize the search input and convert it to a search.
2027             final String encodedUrlString = URLEncoder.encode(unformattedUrlString, "UTF-8");
2028
2029             // Add the base search URL.
2030             formattedUrlString = searchURL + encodedUrlString;
2031         }
2032
2033         loadUrl(formattedUrlString);
2034
2035         // Hide the keyboard so we can see the webpage.  `0` indicates no additional flags.
2036         inputMethodManager.hideSoftInputFromWindow(mainWebView.getWindowToken(), 0);
2037     }
2038
2039
2040     private void loadUrl(String url) {
2041         // Apply any custom domain settings.
2042         applyDomainSettings(url);
2043
2044         // Load the URL.
2045         mainWebView.loadUrl(url, customHeaders);
2046     }
2047
2048     public void findPreviousOnPage(View view) {
2049         // Go to the previous highlighted phrase on the page.  `false` goes backwards instead of forwards.
2050         mainWebView.findNext(false);
2051     }
2052
2053     public void findNextOnPage(View view) {
2054         // Go to the next highlighted phrase on the page. `true` goes forwards instead of backwards.
2055         mainWebView.findNext(true);
2056     }
2057
2058     public void closeFindOnPage(View view) {
2059         // Delete the contents of `find_on_page_edittext`.
2060         findOnPageEditText.setText(null);
2061
2062         // Clear the highlighted phrases.
2063         mainWebView.clearMatches();
2064
2065         // Hide the Find on Page `RelativeLayout`.
2066         findOnPageLinearLayout.setVisibility(View.GONE);
2067
2068         // Show the URL app bar.
2069         supportAppBar.setVisibility(View.VISIBLE);
2070
2071         // Hide the keyboard so we can see the webpage.  `0` indicates no additional flags.
2072         inputMethodManager.hideSoftInputFromWindow(mainWebView.getWindowToken(), 0);
2073     }
2074
2075     private void applyAppSettings() {
2076         // Get the shared preference values.  `this` references the current context.
2077         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
2078
2079         // Store the values from `sharedPreferences` in variables.
2080         String homepageString = sharedPreferences.getString("homepage", "https://duckduckgo.com");
2081         String torHomepageString = sharedPreferences.getString("tor_homepage", "https://3g2upl4pq6kufc4m.onion");
2082         String torSearchString = sharedPreferences.getString("tor_search", "https://3g2upl4pq6kufc4m.onion/html/?q=");
2083         String torSearchCustomURLString = sharedPreferences.getString("tor_search_custom_url", "");
2084         String searchString = sharedPreferences.getString("search", "https://duckduckgo.com/html/?q=");
2085         String searchCustomURLString = sharedPreferences.getString("search_custom_url", "");
2086         adBlockerEnabled = sharedPreferences.getBoolean("block_ads", true);
2087         incognitoModeEnabled = sharedPreferences.getBoolean("incognito_mode", false);
2088         boolean doNotTrackEnabled = sharedPreferences.getBoolean("do_not_track", false);
2089         boolean proxyThroughOrbot = sharedPreferences.getBoolean("proxy_through_orbot", false);
2090         fullScreenBrowsingModeEnabled = sharedPreferences.getBoolean("full_screen_browsing_mode", false);
2091         hideSystemBarsOnFullscreen = sharedPreferences.getBoolean("hide_system_bars", false);
2092         translucentNavigationBarOnFullscreen = sharedPreferences.getBoolean("translucent_navigation_bar", true);
2093         swipeToRefreshEnabled = sharedPreferences.getBoolean("swipe_to_refresh", false);
2094         displayWebpageImagesBoolean = sharedPreferences.getBoolean("display_webpage_images", true);
2095
2096         // Set the homepage, search, and proxy options.
2097         if (proxyThroughOrbot) {  // Set the Tor options.
2098             // Set `torHomepageString` as `homepage`.
2099             homepage = torHomepageString;
2100
2101             // If formattedUrlString is null assign the homepage to it.
2102             if (formattedUrlString == null) {
2103                 formattedUrlString = homepage;
2104             }
2105
2106             // Set the search URL.
2107             if (torSearchString.equals("Custom URL")) {  // Get the custom URL string.
2108                 searchURL = torSearchCustomURLString;
2109             } else {  // Use the string from the pre-built list.
2110                 searchURL = torSearchString;
2111             }
2112
2113             // Set the proxy.  `this` refers to the current activity where an `AlertDialog` might be displayed.
2114             OrbotProxyHelper.setProxy(getApplicationContext(), this, "localhost", "8118");
2115
2116             // Display a message to the user if we are waiting on Orbot.
2117             if (!orbotStatus.equals("ON")) {
2118                 // Set `waitingForOrbot`.
2119                 waitingForOrbot = true;
2120
2121                 // Load a waiting page.  `null` specifies no encoding, which defaults to ASCII.
2122                 mainWebView.loadData(waitingForOrbotHTMLString, "text/html", null);
2123             }
2124         } else {  // Set the non-Tor options.
2125             // Set `homepageString` as `homepage`.
2126             homepage = homepageString;
2127
2128             // If formattedUrlString is null assign the homepage to it.
2129             if (formattedUrlString == null) {
2130                 formattedUrlString = homepage;
2131             }
2132
2133             // Set the search URL.
2134             if (searchString.equals("Custom URL")) {  // Get the custom URL string.
2135                 searchURL = searchCustomURLString;
2136             } else {  // Use the string from the pre-built list.
2137                 searchURL = searchString;
2138             }
2139
2140             // Reset the proxy to default.  The host is `""` and the port is `"0"`.
2141             OrbotProxyHelper.setProxy(getApplicationContext(), this, "", "0");
2142
2143             // Reset `waitingForOrbot.
2144             waitingForOrbot = false;
2145         }
2146
2147         // Set swipe to refresh.
2148         swipeRefreshLayout.setEnabled(swipeToRefreshEnabled);
2149
2150         // Set Do Not Track status.
2151         if (doNotTrackEnabled) {
2152             customHeaders.put("DNT", "1");
2153         } else {
2154             customHeaders.remove("DNT");
2155         }
2156
2157         // Apply the appropriate full screen mode the `SYSTEM_UI` flags.
2158         if (fullScreenBrowsingModeEnabled && inFullScreenBrowsingMode) {
2159             if (hideSystemBarsOnFullscreen) {  // Hide everything.
2160                 // Remove the translucent navigation setting if it is currently flagged.
2161                 getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
2162
2163                 // Remove the translucent status bar overlay.
2164                 getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
2165
2166                 // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
2167                 drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
2168
2169                 /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
2170                  * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
2171                  * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically rehides them after they are shown.
2172                  */
2173                 rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
2174             } else {  // Hide everything except the status and navigation bars.
2175                 // Add the translucent status flag if it is unset.
2176                 getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
2177
2178                 if (translucentNavigationBarOnFullscreen) {
2179                     // Set the navigation bar to be translucent.
2180                     getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
2181                 } else {
2182                     // Set the navigation bar to be black.
2183                     getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
2184                 }
2185             }
2186         } else {  // Switch to normal viewing mode.
2187             // Reset `inFullScreenBrowsingMode` to `false`.
2188             inFullScreenBrowsingMode = false;
2189
2190             // Show the `appBar` if `findOnPageLinearLayout` is not visible.
2191             if (findOnPageLinearLayout.getVisibility() == View.GONE) {
2192                 appBar.show();
2193             }
2194
2195             // Show the `BannerAd` in the free flavor.
2196             if (BuildConfig.FLAVOR.contentEquals("free")) {
2197                 // Reload the ad.  Because the screen may have rotated, we need to use `reloadAfterRotate`.
2198                 BannerAd.reloadAfterRotate(adView, getApplicationContext(), getString(R.string.ad_id));
2199
2200                 // Reinitialize the `adView` variable, as the `View` will have been removed and re-added by `BannerAd.reloadAfterRotate()`.
2201                 adView = findViewById(R.id.adview);
2202             }
2203
2204             // Remove the translucent navigation bar flag if it is set.
2205             getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
2206
2207             // Add the translucent status flag if it is unset.  This also resets `drawerLayout's` `View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN`.
2208             getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
2209
2210             // Remove any `SYSTEM_UI` flags from `rootCoordinatorLayout`.
2211             rootCoordinatorLayout.setSystemUiVisibility(0);
2212
2213             // Constrain `rootCoordinatorLayout` inside the status and navigation bars.
2214             rootCoordinatorLayout.setFitsSystemWindows(true);
2215         }
2216     }
2217
2218     // We have to use the deprecated `.getDrawable()` until the minimum API >= 21.
2219     @SuppressWarnings("deprecation")
2220     private void applyDomainSettings(String url) {
2221         // Reset `navigatingHistory`.
2222         navigatingHistory = false;
2223
2224         // Parse the URL into a URI.
2225         Uri uri = Uri.parse(url);
2226
2227         // Extract the domain from `uri`.
2228         String hostName = uri.getHost();
2229
2230         // Initialize `loadingNewDomainName`.
2231         boolean loadingNewDomainName;
2232
2233         // If either `hostName` or `currentDomainName` are `null`, run the options for loading a new domain name.
2234         // The lint suggestion to simplify the `if` statement is incorrect, because `hostName.equals(currentDomainName)` can produce a `null object reference.`
2235         //noinspection SimplifiableIfStatement
2236         if ((hostName == null) || (currentDomainName == null)) {
2237             loadingNewDomainName = true;
2238         } else {  // Determine if `hostName` equals `currentDomainName`.
2239             loadingNewDomainName = !hostName.equals(currentDomainName);
2240         }
2241
2242         // 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.
2243         if (loadingNewDomainName) {
2244             // Set the new `hostname` as the `currentDomainName`.
2245             currentDomainName = hostName;
2246
2247             // Reset `favoriteIconBitmap` and display it in the `appbar`.
2248             favoriteIconBitmap = favoriteIconDefaultBitmap;
2249             favoriteIconImageView.setImageBitmap(Bitmap.createScaledBitmap(favoriteIconBitmap, 64, 64, true));
2250
2251             // Initialize the database handler.  `this` specifies the context.  The two `nulls` do not specify the database name or a `CursorFactory`.
2252             // The `0` specifies the database version, but that is ignored and set instead using a constant in `DomainsDatabaseHelper`.
2253             DomainsDatabaseHelper domainsDatabaseHelper = new DomainsDatabaseHelper(this, null, null, 0);
2254
2255             // Get a full cursor from `domainsDatabaseHelper`.
2256             Cursor domainNameCursor = domainsDatabaseHelper.getDomainNameCursorOrderedByDomain();
2257
2258             // Initialize `domainSettingsSet`.
2259             Set<String> domainSettingsSet = new HashSet<>();
2260
2261             // Get the domain name column index.
2262             int domainNameColumnIndex = domainNameCursor.getColumnIndex(DomainsDatabaseHelper.DOMAIN_NAME);
2263
2264             // Populate `domainSettingsSet`.
2265             for (int i = 0; i < domainNameCursor.getCount(); i++) {
2266                 // Move `domainsCursor` to the current row.
2267                 domainNameCursor.moveToPosition(i);
2268
2269                 // Store the domain name in `domainSettingsSet`.
2270                 domainSettingsSet.add(domainNameCursor.getString(domainNameColumnIndex));
2271             }
2272
2273             // Close `domainNameCursor.
2274             domainNameCursor.close();
2275
2276             // Initialize variables to track if domain settings will be applied and, if so, under which name.
2277             domainSettingsApplied = false;
2278             String domainNameInDatabase = null;
2279
2280             // Check the hostname.
2281             if (domainSettingsSet.contains(hostName)) {
2282                 domainSettingsApplied = true;
2283                 domainNameInDatabase = hostName;
2284             }
2285
2286             // If `hostName` is not `null`, check all the subdomains of `hostName` against wildcard domains in `domainCursor`.
2287             if (hostName != null) {
2288                 while (hostName.contains(".") && !domainSettingsApplied) {  // Stop checking if we run out of  `.` or if we already know that `domainSettingsApplied` is `true`.
2289                     if (domainSettingsSet.contains("*." + hostName)) {  // Check the host name prepended by `*.`.
2290                         domainSettingsApplied = true;
2291                         domainNameInDatabase = "*." + hostName;
2292                     }
2293
2294                     // Strip out the lowest subdomain of `host`.
2295                     hostName = hostName.substring(hostName.indexOf(".") + 1);
2296                 }
2297             }
2298
2299             // Get a handle for the shared preference.  `this` references the current context.
2300             SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
2301
2302             if (domainSettingsApplied) {  // The url we are loading has custom domain settings.
2303                 // Get a cursor for the current host and move it to the first position.
2304                 Cursor currentHostDomainSettingsCursor = domainsDatabaseHelper.getCursorForDomainName(domainNameInDatabase);
2305                 currentHostDomainSettingsCursor.moveToFirst();
2306
2307                 // Get the settings from the cursor.
2308                 javaScriptEnabled = (currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_JAVASCRIPT)) == 1);
2309                 firstPartyCookiesEnabled = (currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_FIRST_PARTY_COOKIES)) == 1);
2310                 thirdPartyCookiesEnabled = (currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_THIRD_PARTY_COOKIES)) == 1);
2311                 domStorageEnabled = (currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_DOM_STORAGE)) == 1);
2312                 saveFormDataEnabled = (currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_FORM_DATA)) == 1);
2313                 String userAgentString = currentHostDomainSettingsCursor.getString(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.USER_AGENT));
2314                 int fontSize = currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.FONT_SIZE));
2315                 displayWebpageImagesInt = currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.DISPLAY_IMAGES));
2316
2317                 // Close `currentHostDomainSettingsCursor`.
2318                 currentHostDomainSettingsCursor.close();
2319
2320                 // Apply the domain settings.
2321                 mainWebView.getSettings().setJavaScriptEnabled(javaScriptEnabled);
2322                 cookieManager.setAcceptCookie(firstPartyCookiesEnabled);
2323                 mainWebView.getSettings().setDomStorageEnabled(domStorageEnabled);
2324                 mainWebView.getSettings().setSaveFormData(saveFormDataEnabled);
2325                 mainWebView.getSettings().setTextZoom(fontSize);
2326
2327                 // Set third-party cookies status if API >= 21.
2328                 if (Build.VERSION.SDK_INT >= 21) {
2329                     cookieManager.setAcceptThirdPartyCookies(mainWebView, thirdPartyCookiesEnabled);
2330                 }
2331
2332                 // Set the user agent.
2333                 if (userAgentString.equals("WebView default user agent")) {
2334                     // Set the user agent to `""`, which uses the default value.
2335                     mainWebView.getSettings().setUserAgentString("");
2336                 } else {
2337                     // Use the selected user agent.
2338                     mainWebView.getSettings().setUserAgentString(userAgentString);
2339                 }
2340
2341                 // 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.
2342                 urlAppBarRelativeLayout.setBackground(getResources().getDrawable(R.drawable.url_bar_background_green));
2343             } else {  // The URL we are loading does not have custom domain settings.  Load the defaults.
2344                 // Store the values from `sharedPreferences` in variables.
2345                 javaScriptEnabled = sharedPreferences.getBoolean("javascript_enabled", false);
2346                 firstPartyCookiesEnabled = sharedPreferences.getBoolean("first_party_cookies_enabled", false);
2347                 thirdPartyCookiesEnabled = sharedPreferences.getBoolean("third_party_cookies_enabled", false);
2348                 domStorageEnabled = sharedPreferences.getBoolean("dom_storage_enabled", false);
2349                 saveFormDataEnabled = sharedPreferences.getBoolean("save_form_data_enabled", false);
2350                 String userAgentString = sharedPreferences.getString("user_agent", "PrivacyBrowser/1.0");
2351                 String customUserAgentString = sharedPreferences.getString("custom_user_agent", "PrivacyBrowser/1.0");
2352                 String defaultFontSizeString = sharedPreferences.getString("default_font_size", "100");
2353
2354                 // Apply the default settings.
2355                 mainWebView.getSettings().setJavaScriptEnabled(javaScriptEnabled);
2356                 cookieManager.setAcceptCookie(firstPartyCookiesEnabled);
2357                 mainWebView.getSettings().setDomStorageEnabled(domStorageEnabled);
2358                 mainWebView.getSettings().setSaveFormData(saveFormDataEnabled);
2359                 mainWebView.getSettings().setTextZoom(Integer.valueOf(defaultFontSizeString));
2360
2361                 // Set third-party cookies status if API >= 21.
2362                 if (Build.VERSION.SDK_INT >= 21) {
2363                     cookieManager.setAcceptThirdPartyCookies(mainWebView, thirdPartyCookiesEnabled);
2364                 }
2365
2366                 // Set the default user agent.
2367                 switch (userAgentString) {
2368                     case "WebView default user agent":
2369                         // Set the user agent to `""`, which uses the default value.
2370                         mainWebView.getSettings().setUserAgentString("");
2371                         break;
2372
2373                     case "Custom user agent":
2374                         // Set the custom user agent.
2375                         mainWebView.getSettings().setUserAgentString(customUserAgentString);
2376                         break;
2377
2378                     default:
2379                         // Use the selected user agent.
2380                         mainWebView.getSettings().setUserAgentString(userAgentString);
2381                         break;
2382                 }
2383
2384                 // Set a transparent background on `urlTextBox`.  We have to use the deprecated `.getDrawable()` until the minimum API >= 21.
2385                 urlAppBarRelativeLayout.setBackgroundDrawable(getResources().getDrawable(R.drawable.url_bar_background_transparent));
2386             }
2387
2388             // Close `domainsDatabaseHelper`.
2389             domainsDatabaseHelper.close();
2390
2391             // Remove the `onTheFlyDisplayImagesSet` flag and set the display webpage images mode.  `true` indicates that custom domain settings are applied.
2392             onTheFlyDisplayImagesSet = false;
2393             setDisplayWebpageImages();
2394
2395             // Update the privacy icons, but only if `mainMenu` has already been populated.
2396             if (mainMenu != null) {
2397                 updatePrivacyIcons(true);
2398             }
2399         }
2400     }
2401
2402     private void setDisplayWebpageImages() {
2403         if (!onTheFlyDisplayImagesSet) {
2404             if (domainSettingsApplied) {  // Custom domain settings are applied.
2405                 switch (displayWebpageImagesInt) {
2406                     case DomainsDatabaseHelper.DISPLAY_WEBPAGE_IMAGES_SYSTEM_DEFAULT:
2407                         mainWebView.getSettings().setLoadsImagesAutomatically(displayWebpageImagesBoolean);
2408                         break;
2409
2410                     case DomainsDatabaseHelper.DISPLAY_WEBPAGE_IMAGES_ENABLED:
2411                         mainWebView.getSettings().setLoadsImagesAutomatically(true);
2412                         break;
2413
2414                     case DomainsDatabaseHelper.DISPLAY_WEBPAGE_IMAGES_DISABLED:
2415                         mainWebView.getSettings().setLoadsImagesAutomatically(false);
2416                         break;
2417                 }
2418             } else {  // Default settings are applied.
2419                 mainWebView.getSettings().setLoadsImagesAutomatically(displayWebpageImagesBoolean);
2420             }
2421         }
2422     }
2423
2424     private void updatePrivacyIcons(boolean runInvalidateOptionsMenu) {
2425         // Get handles for the icons.
2426         MenuItem privacyIconMenuItem = mainMenu.findItem(R.id.toggle_javascript);
2427         MenuItem firstPartyCookiesIconMenuItem = mainMenu.findItem(R.id.toggle_first_party_cookies);
2428         MenuItem domStorageIconMenuItem = mainMenu.findItem(R.id.toggle_dom_storage);
2429         MenuItem formDataIconMenuItem = mainMenu.findItem(R.id.toggle_save_form_data);
2430
2431         // Update `privacyIcon`.
2432         if (javaScriptEnabled) {  // JavaScript is enabled.
2433             privacyIconMenuItem.setIcon(R.drawable.javascript_enabled);
2434         } else if (firstPartyCookiesEnabled) {  // JavaScript is disabled but cookies are enabled.
2435             privacyIconMenuItem.setIcon(R.drawable.warning);
2436         } else {  // All the dangerous features are disabled.
2437             privacyIconMenuItem.setIcon(R.drawable.privacy_mode);
2438         }
2439
2440         // Update `firstPartyCookiesIcon`.
2441         if (firstPartyCookiesEnabled) {  // First-party cookies are enabled.
2442             firstPartyCookiesIconMenuItem.setIcon(R.drawable.cookies_enabled);
2443         } else {  // First-party cookies are disabled.
2444             firstPartyCookiesIconMenuItem.setIcon(R.drawable.cookies_disabled);
2445         }
2446
2447         // Update `domStorageIcon`.
2448         if (javaScriptEnabled && domStorageEnabled) {  // Both JavaScript and DOM storage are enabled.
2449             domStorageIconMenuItem.setIcon(R.drawable.dom_storage_enabled);
2450         } else if (javaScriptEnabled) {  // JavaScript is enabled but DOM storage is disabled.
2451             domStorageIconMenuItem.setIcon(R.drawable.dom_storage_disabled);
2452         } else {  // JavaScript is disabled, so DOM storage is ghosted.
2453             domStorageIconMenuItem.setIcon(R.drawable.dom_storage_ghosted);
2454         }
2455
2456         // Update `formDataIcon`.
2457         if (saveFormDataEnabled) {  // Form data is enabled.
2458             formDataIconMenuItem.setIcon(R.drawable.form_data_enabled);
2459         } else {  // Form data is disabled.
2460             formDataIconMenuItem.setIcon(R.drawable.form_data_disabled);
2461         }
2462
2463         // `invalidateOptionsMenu` calls `onPrepareOptionsMenu()` and redraws the icons in the `AppBar`.  `this` references the current activity.
2464         if (runInvalidateOptionsMenu) {
2465             ActivityCompat.invalidateOptionsMenu(this);
2466         }
2467     }
2468 }