Allow loading of hosts that are not fQDNs from the URL text box. Fixes https://redmi...
[PrivacyBrowser.git] / app / src / main / java / com / stoutner / privacybrowser / activities / MainWebViewActivity.java
1 /*
2  * Copyright 2015-2017 Soren Stoutner <soren@stoutner.com>.
3  *
4  * Download cookie code contributed 2017 Hendrik Knackstedt.  Copyright assigned to Soren Stoutner <soren@stoutner.com>.
5  *
6  * This file is part of Privacy Browser <https://www.stoutner.com/privacy-browser>.
7  *
8  * Privacy Browser is free software: you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation, either version 3 of the License, or
11  * (at your option) any later version.
12  *
13  * Privacy Browser is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with Privacy Browser.  If not, see <http://www.gnu.org/licenses/>.
20  */
21
22 package com.stoutner.privacybrowser.activities;
23
24 import android.annotation.SuppressLint;
25 import android.app.DialogFragment;
26 import android.app.DownloadManager;
27 import android.content.BroadcastReceiver;
28 import android.content.ClipData;
29 import android.content.ClipboardManager;
30 import android.content.Context;
31 import android.content.Intent;
32 import android.content.IntentFilter;
33 import android.content.SharedPreferences;
34 import android.content.res.Configuration;
35 import android.database.Cursor;
36 import android.graphics.Bitmap;
37 import android.graphics.drawable.BitmapDrawable;
38 import android.graphics.drawable.Drawable;
39 import android.net.Uri;
40 import android.net.http.SslCertificate;
41 import android.net.http.SslError;
42 import android.os.Build;
43 import android.os.Bundle;
44 import android.preference.PreferenceManager;
45 import android.print.PrintDocumentAdapter;
46 import android.print.PrintManager;
47 import android.support.annotation.NonNull;
48 import android.support.design.widget.CoordinatorLayout;
49 import android.support.design.widget.NavigationView;
50 import android.support.design.widget.Snackbar;
51 import android.support.v4.app.ActivityCompat;
52 import android.support.v4.content.ContextCompat;
53 import android.support.v4.view.GravityCompat;
54 import android.support.v4.widget.DrawerLayout;
55 import android.support.v4.widget.SwipeRefreshLayout;
56 import android.support.v7.app.ActionBar;
57 import android.support.v7.app.ActionBarDrawerToggle;
58 import android.support.v7.app.AppCompatActivity;
59 import android.support.v7.app.AppCompatDialogFragment;
60 import android.support.v7.widget.Toolbar;
61 import android.text.Editable;
62 import android.text.TextWatcher;
63 import android.util.Patterns;
64 import android.view.ContextMenu;
65 import android.view.GestureDetector;
66 import android.view.KeyEvent;
67 import android.view.Menu;
68 import android.view.MenuItem;
69 import android.view.MotionEvent;
70 import android.view.View;
71 import android.view.WindowManager;
72 import android.view.inputmethod.InputMethodManager;
73 import android.webkit.CookieManager;
74 import android.webkit.DownloadListener;
75 import android.webkit.SslErrorHandler;
76 import android.webkit.WebBackForwardList;
77 import android.webkit.WebChromeClient;
78 import android.webkit.WebResourceResponse;
79 import android.webkit.WebStorage;
80 import android.webkit.WebView;
81 import android.webkit.WebViewClient;
82 import android.webkit.WebViewDatabase;
83 import android.widget.EditText;
84 import android.widget.FrameLayout;
85 import android.widget.ImageView;
86 import android.widget.LinearLayout;
87 import android.widget.ProgressBar;
88 import android.widget.RelativeLayout;
89 import android.widget.TextView;
90
91 import com.stoutner.privacybrowser.BannerAd;
92 import com.stoutner.privacybrowser.BuildConfig;
93 import com.stoutner.privacybrowser.R;
94 import com.stoutner.privacybrowser.dialogs.CreateHomeScreenShortcutDialog;
95 import com.stoutner.privacybrowser.dialogs.DownloadImageDialog;
96 import com.stoutner.privacybrowser.dialogs.UrlHistoryDialog;
97 import com.stoutner.privacybrowser.dialogs.ViewSslCertificateDialog;
98 import com.stoutner.privacybrowser.helpers.DomainsDatabaseHelper;
99 import com.stoutner.privacybrowser.helpers.OrbotProxyHelper;
100 import com.stoutner.privacybrowser.dialogs.DownloadFileDialog;
101 import com.stoutner.privacybrowser.dialogs.SslCertificateErrorDialog;
102
103 import java.io.BufferedReader;
104 import java.io.ByteArrayInputStream;
105 import java.io.IOException;
106 import java.io.InputStreamReader;
107 import java.io.UnsupportedEncodingException;
108 import java.net.MalformedURLException;
109 import java.net.URL;
110 import java.net.URLDecoder;
111 import java.net.URLEncoder;
112 import java.util.HashMap;
113 import java.util.HashSet;
114 import java.util.Map;
115 import java.util.Set;
116
117 // We need to use AppCompatActivity from android.support.v7.app.AppCompatActivity to have access to the SupportActionBar until the minimum API is >= 21.
118 public class MainWebViewActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, CreateHomeScreenShortcutDialog.CreateHomeScreenSchortcutListener,
119         SslCertificateErrorDialog.SslCertificateErrorListener, DownloadFileDialog.DownloadFileListener, DownloadImageDialog.DownloadImageListener, UrlHistoryDialog.UrlHistoryListener {
120
121     // `appBar` is public static so it can be accessed from `OrbotProxyHelper`.  It is also used in `onCreate()`, `onOptionsItemSelected()`, `closeFindOnPage()`, and `applyAppSettings()`.
122     public static ActionBar appBar;
123
124     // `favoriteIconBitmap` is public static so it can be accessed from `CreateHomeScreenShortcutDialog`, `BookmarksActivity`, `CreateBookmarkDialog`, `CreateBookmarkFolderDialog`, `EditBookmarkDialog`, `EditBookmarkFolderDialog`, `ViewSslCertificateDialog`.
125     // It is also used in `onCreate()`, `onCreateHomeScreenShortcutCreate()`, and `applyDomainSettings`.
126     public static Bitmap favoriteIconBitmap;
127
128     // `formattedUrlString` is public static so it can be accessed from `BookmarksActivity`, `CreateBookmarkDialog`, and `AddDomainDialog`.
129     // It is also used in `onCreate()`, `onOptionsItemSelected()`, `onNavigationItemSelected()`, `onCreateHomeScreenShortcutCreate()`, and `loadUrlFromTextBox()`.
130     public static String formattedUrlString;
131
132     // `sslCertificate` is public static so it can be accessed from `ViewSslCertificateDialog`.  It is also used in `onCreate()`.
133     public static SslCertificate sslCertificate;
134
135     // `orbotStatus` is public static so it can be accessed from `OrbotProxyHelper`.  It is also used in `onCreate()`.
136     public static String orbotStatus;
137
138     // `webViewTitle` is public static so it can be accessed from `CreateBookmarkDialog` and `CreateHomeScreenShortcutDialog`.  It is also used in `onCreate()`.
139     public static String webViewTitle;
140
141
142     // `navigatingHistory` is used in `onCreate()`, `onNavigationItemSelected()`, and `applyDomainSettings()`.
143     private boolean navigatingHistory;
144
145     // `favoriteIconDefaultBitmap` is used in `onCreate()` and `applyDomainSettings`.
146     private Bitmap favoriteIconDefaultBitmap;
147
148     // `drawerLayout` is used in `onCreate()`, `onNewIntent()`, and `onBackPressed()`.
149     private DrawerLayout drawerLayout;
150
151     // `rootCoordinatorLayout` is used in `onCreate()` and `applyAppSettings()`.
152     private CoordinatorLayout rootCoordinatorLayout;
153
154     // 'mainWebView' is used in `onCreate()`, `onOptionsItemSelected()`, `onNavigationItemSelected()`, `onRestart()`, `onCreateContextMenu()`, `findPreviousOnPage()`, `findNextOnPage()`, `closeFindOnPage()`, and `loadUrlFromTextBox()`.
155     private WebView mainWebView;
156
157     // `fullScreenVideoFrameLayout` is used in `onCreate()` and `onConfigurationChanged()`.
158     private FrameLayout fullScreenVideoFrameLayout;
159
160     // `swipeRefreshLayout` is used in `onCreate()`, `onPrepareOptionsMenu`, and `onRestart()`.
161     private SwipeRefreshLayout swipeRefreshLayout;
162
163     // `urlAppBarRelativeLayout` is used in `onCreate()` and `applyDomainSettings()`.
164     private RelativeLayout urlAppBarRelativeLayout;
165
166     // `favoriteIconImageView` is used in `onCreate()` and `applyDomainSettings()`
167     private ImageView favoriteIconImageView;
168
169     // `cookieManager` is used in `onCreate()`, `onOptionsItemSelected()`, and `onNavigationItemSelected()`, `loadUrlFromTextBox()`, `onDownloadImage()`, `onDownloadFile()`, and `onRestart()`.
170     private CookieManager cookieManager;
171
172     // `customHeader` is used in `onCreate()`, `onOptionsItemSelected()`, `onCreateContextMenu()`, and `loadUrl()`.
173     private final Map<String, String> customHeaders = new HashMap<>();
174
175     // `javaScriptEnabled` is also used in `onCreate()`, `onCreateOptionsMenu()`, `onOptionsItemSelected()`, `loadUrlFromTextBox()`, and `applyAppSettings()`.
176     // It is `Boolean` instead of `boolean` because `applyAppSettings()` needs to know if it is `null`.
177     private Boolean javaScriptEnabled;
178
179     // `firstPartyCookiesEnabled` is used in `onCreate()`, `onCreateOptionsMenu()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, `onDownloadImage()`, `onDownloadFile()`, and `applyAppSettings()`.
180     private boolean firstPartyCookiesEnabled;
181
182     // `thirdPartyCookiesEnabled` used in `onCreate()`, `onCreateOptionsMenu()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, and `applyAppSettings()`.
183     private boolean thirdPartyCookiesEnabled;
184
185     // `domStorageEnabled` is used in `onCreate()`, `onCreateOptionsMenu()`, `onOptionsItemSelected()`, and `applyAppSettings()`.
186     private boolean domStorageEnabled;
187
188     // `saveFormDataEnabled` is used in `onCreate()`, `onCreateOptionsMenu()`, `onOptionsItemSelected()`, and `applyAppSettings()`.
189     private boolean saveFormDataEnabled;
190
191     // `swipeToRefreshEnabled` is used in `onPrepareOptionsMenu()` and `applyAppSettings()`.
192     private boolean swipeToRefreshEnabled;
193
194     // 'homepage' is used in `onCreate()`, `onNavigationItemSelected()`, and `applyAppSettings()`.
195     private String homepage;
196
197     // `searchURL` is used in `loadURLFromTextBox()` and `applyAppSettings()`.
198     private String searchURL;
199
200     // `adBlockerEnabled` is used in `onCreate()` and `applyAppSettings()`.
201     private boolean adBlockerEnabled;
202
203     // `privacyBrowserRuntime` is used in `onCreate()` and `applyAppSettings()`.
204     Runtime privacyBrowserRuntime;
205
206     // `incognitoModeEnabled` is used in `onCreate()` and `applyAppSettings()`.
207     private boolean incognitoModeEnabled;
208
209     // `fullScreenBrowsingModeEnabled` is used in `onCreate()` and `applyAppSettings()`.
210     private boolean fullScreenBrowsingModeEnabled;
211
212     // `inFullScreenBrowsingMode` is used in `onCreate()`, `onConfigurationChanged()`, and `applyAppSettings()`.
213     private boolean inFullScreenBrowsingMode;
214
215     // `hideSystemBarsOnFullscreen` is used in `onCreate()` and `applyAppSettings()`.
216     private boolean hideSystemBarsOnFullscreen;
217
218     // `translucentNavigationBarOnFullscreen` is used in `onCreate()` and `applyAppSettings()`.
219     private boolean translucentNavigationBarOnFullscreen;
220
221     // `currentDomainName` is used in `onCreate(), `onNavigationItemSelected()`, and `applyDomainSettings()`.
222     private String currentDomainName;
223
224     // `waitingForOrbot` is used in `onCreate()` and `applyAppSettings()`.
225     private boolean waitingForOrbot;
226
227     // `waitingForOrbotData` is used in `onCreate()` and `applyAppSettings()`.
228     private String waitingForOrbotHTMLString;
229
230     // `privateDataDirectoryString` is used in `onCreate()` and `onNavigationItemSelected()`.
231     private String privateDataDirectoryString;
232
233     // `findOnPageLinearLayout` is used in `onCreate()`, `onOptionsItemSelected()`, and `closeFindOnPage()`.
234     private LinearLayout findOnPageLinearLayout;
235
236     // `findOnPageEditText` is used in `onCreate()`, `onOptionsItemSelected()`, and `closeFindOnPage()`.
237     private EditText findOnPageEditText;
238
239     // `mainMenu` is used in `onCreateOptionsMenu()` and `updatePrivacyIcons()`.
240     private Menu mainMenu;
241
242     // `drawerToggle` is used in `onCreate()`, `onPostCreate()`, `onConfigurationChanged()`, `onNewIntent()`, and `onNavigationItemSelected()`.
243     private ActionBarDrawerToggle drawerToggle;
244
245     // `supportAppBar` is used in `onCreate()`, `onOptionsItemSelected()`, and `closeFindOnPage()`.
246     private Toolbar supportAppBar;
247
248     // `urlTextBox` is used in `onCreate()`, `onOptionsItemSelected()`, `loadUrlFromTextBox()`, and `loadUrl()`.
249     private EditText urlTextBox;
250
251     // `adView` is used in `onCreate()` and `onConfigurationChanged()`.
252     private View adView;
253
254     // `sslErrorHandler` is used in `onCreate()`, `onSslErrorCancel()`, and `onSslErrorProceed`.
255     private SslErrorHandler sslErrorHandler;
256
257     // `inputMethodManager` is used in `onOptionsItemSelected()`, `loadUrlFromTextBox()`, and `closeFindOnPage()`.
258     private InputMethodManager inputMethodManager;
259
260     // `mainWebViewRelativeLayout` is used in `onCreate()` and `onNavigationItemSelected()`.
261     private RelativeLayout mainWebViewRelativeLayout;
262
263     @Override
264     // 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.
265     @SuppressLint("SetJavaScriptEnabled")
266     protected void onCreate(Bundle savedInstanceState) {
267         super.onCreate(savedInstanceState);
268         setContentView(R.layout.main_drawerlayout);
269
270         // Get a handle for `inputMethodManager`.
271         inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
272
273         // We need to use the `SupportActionBar` from `android.support.v7.app.ActionBar` until the minimum API is >= 21.
274         supportAppBar = (Toolbar) findViewById(R.id.app_bar);
275         setSupportActionBar(supportAppBar);
276         appBar = getSupportActionBar();
277
278         // This is needed to get rid of the Android Studio warning that `appBar` might be null.
279         assert appBar != null;
280
281         // Add the custom `url_app_bar` layout, which shows the favorite icon and the URL text bar.
282         appBar.setCustomView(R.layout.url_app_bar);
283         appBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
284
285         // Set the "go" button on the keyboard to load the URL in urlTextBox.
286         urlTextBox = (EditText) appBar.getCustomView().findViewById(R.id.url_edittext);
287         urlTextBox.setOnKeyListener(new View.OnKeyListener() {
288             @Override
289             public boolean onKey(View v, int keyCode, KeyEvent event) {
290                 // If the event is a key-down event on the `enter` button, load the URL.
291                 if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {
292                     // Load the URL into the mainWebView and consume the event.
293                     try {
294                         loadUrlFromTextBox();
295                     } catch (UnsupportedEncodingException e) {
296                         e.printStackTrace();
297                     }
298                     // If the enter key was pressed, consume the event.
299                     return true;
300                 } else {
301                     // If any other key was pressed, do not consume the event.
302                     return false;
303                 }
304             }
305         });
306
307         // Set `waitingForOrbotHTMLString`.
308         waitingForOrbotHTMLString = "<html><body><br/><center><h1>" + getString(R.string.waiting_for_orbot) + "</h1></center></body></html>";
309
310         // Initialize `currentDomainName`, `orbotStatus`, and `waitingForOrbot`.
311         currentDomainName = "";
312         orbotStatus = "unknown";
313         waitingForOrbot = false;
314
315         // Create an Orbot status `BroadcastReceiver`.
316         BroadcastReceiver orbotStatusBroadcastReceiver = new BroadcastReceiver() {
317             @Override
318             public void onReceive(Context context, Intent intent) {
319                 // Store the content of the status message in `orbotStatus`.
320                 orbotStatus = intent.getStringExtra("org.torproject.android.intent.extra.STATUS");
321
322                 // If we are waiting on Orbot, load the website now that Orbot is connected.
323                 if (orbotStatus.equals("ON") && waitingForOrbot) {
324                     // Reset `waitingForOrbot`.
325                     waitingForOrbot = false;
326
327                     // Load `formattedUrlString
328                     loadUrl(formattedUrlString);
329                 }
330             }
331         };
332
333         // Register `orbotStatusBroadcastReceiver` on `this` context.
334         this.registerReceiver(orbotStatusBroadcastReceiver, new IntentFilter("org.torproject.android.intent.action.STATUS"));
335
336         // Get handles for views that need to be accessed.
337         drawerLayout = (DrawerLayout) findViewById(R.id.drawerlayout);
338         rootCoordinatorLayout = (CoordinatorLayout) findViewById(R.id.root_coordinatorlayout);
339         mainWebViewRelativeLayout = (RelativeLayout) findViewById(R.id.main_webview_relativelayout);
340         mainWebView = (WebView) findViewById(R.id.main_webview);
341         findOnPageLinearLayout = (LinearLayout) findViewById(R.id.find_on_page_linearlayout);
342         findOnPageEditText = (EditText) findViewById(R.id.find_on_page_edittext);
343         fullScreenVideoFrameLayout = (FrameLayout) findViewById(R.id.full_screen_video_framelayout);
344         urlAppBarRelativeLayout = (RelativeLayout) findViewById(R.id.url_app_bar_relativelayout);
345         favoriteIconImageView = (ImageView) findViewById(R.id.favorite_icon);
346
347         // Create a double-tap listener to toggle full-screen mode.
348         final GestureDetector gestureDetector = new GestureDetector(this, new GestureDetector.SimpleOnGestureListener() {
349             // Override `onDoubleTap()`.  All other events are handled using the default settings.
350             @Override
351             public boolean onDoubleTap(MotionEvent event) {
352                 if (fullScreenBrowsingModeEnabled) {  // Only process the double-tap if full screen browsing mode is enabled.
353                     // Toggle `inFullScreenBrowsingMode`.
354                     inFullScreenBrowsingMode = !inFullScreenBrowsingMode;
355
356                     if (inFullScreenBrowsingMode) {  // Switch to full screen mode.
357                         // Hide the `appBar`.
358                         appBar.hide();
359
360                         // Hide the `BannerAd` in the free flavor.
361                         if (BuildConfig.FLAVOR.contentEquals("free")) {
362                             BannerAd.hideAd(adView);
363                         }
364
365                         // Modify the system bars.
366                         if (hideSystemBarsOnFullscreen) {  // Hide everything.
367                             // Remove the translucent overlays.
368                             getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
369
370                             // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
371                             drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
372
373                             /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
374                              * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
375                              * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically rehides them after they are shown.
376                              */
377                             rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
378
379                             // Set `rootCoordinatorLayout` to fill the whole screen.
380                             rootCoordinatorLayout.setFitsSystemWindows(false);
381                         } else {  // Hide everything except the status and navigation bars.
382                             // Set `rootCoordinatorLayout` to fit under the status and navigation bars.
383                             rootCoordinatorLayout.setFitsSystemWindows(false);
384
385                             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.
386                                 // Set the navigation bar to be translucent.
387                                 getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
388                             }
389                         }
390                     } else {  // Switch to normal viewing mode.
391                         // Show the `appBar`.
392                         appBar.show();
393
394                         // Show the `BannerAd` in the free flavor.
395                         if (BuildConfig.FLAVOR.contentEquals("free")) {
396                             // Reload the ad.  Because the screen may have rotated, we need to use `reloadAfterRotate`.
397                             BannerAd.reloadAfterRotate(adView, getApplicationContext(), getString(R.string.ad_id));
398
399                             // Reinitialize the `adView` variable, as the `View` will have been removed and re-added by `BannerAd.reloadAfterRotate()`.
400                             adView = findViewById(R.id.adview);
401                         }
402
403                         // Remove the translucent navigation bar flag if it is set.
404                         getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
405
406                         // Add the translucent status flag if it is unset.  This also resets `drawerLayout's` `View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN`.
407                         getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
408
409                         // Remove any `SYSTEM_UI` flags from `rootCoordinatorLayout`.
410                         rootCoordinatorLayout.setSystemUiVisibility(0);
411
412                         // Constrain `rootCoordinatorLayout` inside the status and navigation bars.
413                         rootCoordinatorLayout.setFitsSystemWindows(true);
414                     }
415
416                     // Consume the double-tap.
417                     return true;
418                 } else { // Do not consume the double-tap because full screen browsing mode is disabled.
419                     return false;
420                 }
421             }
422         });
423
424         // Pass all touch events on `mainWebView` through `gestureDetector` to check for double-taps.
425         mainWebView.setOnTouchListener(new View.OnTouchListener() {
426             @Override
427             public boolean onTouch(View v, MotionEvent event) {
428                 // Send the `event` to `gestureDetector`.
429                 return gestureDetector.onTouchEvent(event);
430             }
431         });
432
433         // Update `findOnPageCountTextView`.
434         mainWebView.setFindListener(new WebView.FindListener() {
435             // Get a handle for `findOnPageCountTextView`.
436             final TextView findOnPageCountTextView = (TextView) findViewById(R.id.find_on_page_count_textview);
437
438             @Override
439             public void onFindResultReceived(int activeMatchOrdinal, int numberOfMatches, boolean isDoneCounting) {
440                 if ((isDoneCounting) && (numberOfMatches == 0)) {  // There are no matches.
441                     // Set `findOnPageCountTextView` to `0/0`.
442                     findOnPageCountTextView.setText(R.string.zero_of_zero);
443                 } else if (isDoneCounting) {  // There are matches.
444                     // `activeMatchOrdinal` is zero-based.
445                     int activeMatch = activeMatchOrdinal + 1;
446
447                     // Set `findOnPageCountTextView`.
448                     findOnPageCountTextView.setText(activeMatch + "/" + numberOfMatches);
449                 }
450             }
451         });
452
453         // Search for the string on the page whenever a character changes in the `findOnPageEditText`.
454         findOnPageEditText.addTextChangedListener(new TextWatcher() {
455             @Override
456             public void beforeTextChanged(CharSequence s, int start, int count, int after) {
457                 // Do nothing.
458             }
459
460             @Override
461             public void onTextChanged(CharSequence s, int start, int before, int count) {
462                 // Do nothing.
463             }
464
465             @Override
466             public void afterTextChanged(Editable s) {
467                 // Search for the text in `mainWebView`.
468                 mainWebView.findAllAsync(findOnPageEditText.getText().toString());
469             }
470         });
471
472         // Set the `check mark` button for the `findOnPageEditText` keyboard to close the soft keyboard.
473         findOnPageEditText.setOnKeyListener(new View.OnKeyListener() {
474             @Override
475             public boolean onKey(View v, int keyCode, KeyEvent event) {
476                 if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {  // The `enter` key was pressed.
477                     // Hide the soft keyboard.  `0` indicates no additional flags.
478                     inputMethodManager.hideSoftInputFromWindow(mainWebView.getWindowToken(), 0);
479
480                     // Consume the event.
481                     return true;
482                 } else {  // A different key was pressed.
483                     // Do not consume the event.
484                     return false;
485                 }
486             }
487         });
488
489         // Implement swipe to refresh
490         swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_refreshlayout);
491         swipeRefreshLayout.setColorSchemeResources(R.color.blue_700);
492         swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
493             @Override
494             public void onRefresh() {
495                 mainWebView.reload();
496             }
497         });
498
499         // `DrawerTitle` identifies the `DrawerLayout` in accessibility mode.
500         drawerLayout.setDrawerTitle(GravityCompat.START, getString(R.string.navigation_drawer));
501
502         // Listen for touches on the navigation menu.
503         final NavigationView navigationView = (NavigationView) findViewById(R.id.navigationview);
504         navigationView.setNavigationItemSelectedListener(this);
505
506         // 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.
507         final Menu navigationMenu = navigationView.getMenu();
508         final MenuItem navigationBackMenuItem = navigationMenu.getItem(1);
509         final MenuItem navigationForwardMenuItem = navigationMenu.getItem(2);
510         final MenuItem navigationHistoryMenuItem = navigationMenu.getItem(3);
511
512         // The `DrawerListener` allows us to update the Navigation Menu.
513         drawerLayout.addDrawerListener(new DrawerLayout.DrawerListener() {
514             @Override
515             public void onDrawerSlide(View drawerView, float slideOffset) {
516             }
517
518             @Override
519             public void onDrawerOpened(View drawerView) {
520             }
521
522             @Override
523             public void onDrawerClosed(View drawerView) {
524             }
525
526             @Override
527             public void onDrawerStateChanged(int newState) {
528                 if ((newState == DrawerLayout.STATE_SETTLING) || (newState == DrawerLayout.STATE_DRAGGING)) {  // The drawer is opening or closing.
529                     // Update the `Back`, `Forward`, and `History` menu items.
530                     navigationBackMenuItem.setEnabled(mainWebView.canGoBack());
531                     navigationForwardMenuItem.setEnabled(mainWebView.canGoForward());
532                     navigationHistoryMenuItem.setEnabled((mainWebView.canGoBack() || mainWebView.canGoForward()));
533
534                     // Hide the keyboard so we can see the navigation menu.  `0` indicates no additional flags.
535                     inputMethodManager.hideSoftInputFromWindow(mainWebView.getWindowToken(), 0);
536                 }
537             }
538         });
539
540         // drawerToggle creates the hamburger icon at the start of the AppBar.
541         drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, supportAppBar, R.string.open_navigation_drawer, R.string.close_navigation_drawer);
542
543         // Initialize `adServerSet`.
544         final Set<String> adServersSet = new HashSet<>();
545
546         // Load the list of ad servers into memory.
547         try {
548             // Load `pgl.yoyo.org_adservers.txt` into a `BufferedReader`.
549             BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(getAssets().open("pgl.yoyo.org_adservers.txt")));
550
551             // Create a string for storing each ad server.
552             String adServer;
553
554             // Populate `adServersSet`.
555             while ((adServer = bufferedReader.readLine()) != null) {
556                 adServersSet.add(adServer);
557             }
558
559             // Close `bufferedReader`.
560             bufferedReader.close();
561         } catch (IOException ioException) {
562             // We're pretty sure the asset exists, so we don't need to worry about the `IOException` ever being thrown.
563         }
564
565         mainWebView.setWebViewClient(new WebViewClient() {
566             // `shouldOverrideUrlLoading` makes this `WebView` the default handler for URLs inside the app, so that links are not kicked out to other apps.
567             // We have to use the deprecated `shouldOverrideUrlLoading` until API >= 24.
568             @SuppressWarnings("deprecation")
569             @Override
570             public boolean shouldOverrideUrlLoading(WebView view, String url) {
571                 // Use an external email program if the link begins with `mailto:`.
572                 if (url.startsWith("mailto:")) {
573                     // We use `ACTION_SENDTO` instead of `ACTION_SEND` so that only email programs are launched.
574                     Intent emailIntent = new Intent(Intent.ACTION_SENDTO);
575
576                     // Parse the url and set it as the data for the `Intent`.
577                     emailIntent.setData(Uri.parse(url));
578
579                     // `FLAG_ACTIVITY_NEW_TASK` opens the email program in a new task instead as part of Privacy Browser.
580                     emailIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
581
582                     // Make it so.
583                     startActivity(emailIntent);
584                     return true;
585                 } else {  // Load the URL in Privacy Browser.
586                     loadUrl(url);
587                     return true;
588                 }
589             }
590
591             // Block ads.  We have to use the deprecated `shouldInterceptRequest` until minimum API >= 21.
592             @SuppressWarnings("deprecation")
593             @Override
594             public WebResourceResponse shouldInterceptRequest(WebView view, String url){
595                 if (adBlockerEnabled) {  // Block ads.
596                     // Extract the host from `url`.
597                     Uri requestUri = Uri.parse(url);
598                     String requestHost = requestUri.getHost();
599
600                     // Initialize a variable to track if this is an ad server.
601                     boolean requestHostIsAdServer = false;
602
603                     // Check all the subdomains of `requestHost` if it is not `null` against the ad server database.
604                     if (requestHost != null) {
605                         while (requestHost.contains(".") && !requestHostIsAdServer) {  // Stop checking if we run out of `.` or if we already know that `requestHostIsAdServer` is `true`.
606                             if (adServersSet.contains(requestHost)) {
607                                 requestHostIsAdServer = true;
608                             }
609
610                             // Strip out the lowest subdomain of `requestHost`.
611                             requestHost = requestHost.substring(requestHost.indexOf(".") + 1);
612                         }
613                     }
614
615                     if (requestHostIsAdServer) {  // It is an ad server.
616                         // Return an empty `WebResourceResponse`.
617                         return new WebResourceResponse("text/plain", "utf8", new ByteArrayInputStream("".getBytes()));
618                     } else {  // It is not an ad server.
619                         // `return null` loads the requested resource.
620                         return null;
621                     }
622                 } else {  // Ad blocking is disabled.
623                     // `return null` loads the requested resource.
624                     return null;
625                 }
626             }
627
628             // Update the URL in urlTextBox when the page starts to load.
629             @Override
630             public void onPageStarted(WebView view, String url, Bitmap favicon) {
631                 // Reset `webViewTitle`
632                 webViewTitle = getString(R.string.no_title);
633
634                 // Check to see if we are waiting on Orbot.
635                 if (!waitingForOrbot) {  // We are not waiting on Orbot, so we need to process the URL.
636                     // 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.
637                     formattedUrlString = url;
638
639                     // Display the loading URL is the URL text box.
640                     urlTextBox.setText(url);
641
642                     // Apply any custom domain settings if the URL was loaded by navigating history.
643                     if (navigatingHistory) {
644                         applyDomainSettings(url);
645                     }
646                 }
647             }
648
649             // Update formattedUrlString and urlTextBox.  It is necessary to do this after the page finishes loading because the final URL can change during load.
650             @Override
651             public void onPageFinished(WebView view, String url) {
652                 // Clear the cache and history if Incognito Mode is enabled.
653                 if (incognitoModeEnabled) {
654                     // Clear the cache.  `true` includes disk files.
655                     mainWebView.clearCache(true);
656
657                     // Clear the back/forward history.
658                     mainWebView.clearHistory();
659
660                     // Manually delete cache folders.
661                     try {
662                         // Delete the main `cache` folder.
663                         privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/cache");
664
665                         // 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`.
666                         privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/app_webview");
667                     } catch (IOException e) {
668                         // Do nothing if an error is thrown.
669                     }
670                 }
671
672                 // Update `urlTextBox` and apply domain settings if not waiting on Orbot.
673                 if (!waitingForOrbot) {
674                     // Check to see if `WebView` has set `url` to be `about:blank`.
675                     if (url.equals("about:blank")) {  // `WebView` is blank, so `formattedUrlString` should be `""` and `urlTextBox` should display a hint.
676                         // Set `formattedUrlString` to `""`.
677                         formattedUrlString = "";
678
679                         // Update `urlTextBox`.
680                         urlTextBox.setText(formattedUrlString);
681
682                         // Request focus for `urlTextBox`.
683                         urlTextBox.requestFocus();
684
685                         // Display the keyboard.
686                         inputMethodManager.showSoftInput(urlTextBox, 0);
687
688                         // Apply the domain settings.
689                         applyDomainSettings(formattedUrlString);
690                     } else {  // `WebView` has loaded a webpage.
691                         // Set `formattedUrlString`.
692                         formattedUrlString = url;
693
694                         // Only update `urlTextBox` if the user is not typing in it.
695                         if (!urlTextBox.hasFocus()) {
696                             urlTextBox.setText(formattedUrlString);
697                         }
698                     }
699
700                     // Store the SSL certificate so it can be accessed from `ViewSslCertificateDialog`.
701                     sslCertificate = mainWebView.getCertificate();
702                 }
703             }
704
705             // Handle SSL Certificate errors.
706             @Override
707             public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
708                 // Store `handler` so it can be accesses from `onSslErrorCancel()` and `onSslErrorProceed()`.
709                 sslErrorHandler = handler;
710
711                 // Display the SSL error `AlertDialog`.
712                 AppCompatDialogFragment sslCertificateErrorDialogFragment = SslCertificateErrorDialog.displayDialog(error);
713                 sslCertificateErrorDialogFragment.show(getSupportFragmentManager(), getResources().getString(R.string.ssl_certificate_error));
714             }
715         });
716
717         // Get a handle for the progress bar.
718         final ProgressBar progressBar = (ProgressBar) findViewById(R.id.progress_bar);
719
720         mainWebView.setWebChromeClient(new WebChromeClient() {
721             // Update the progress bar when a page is loading.
722             @Override
723             public void onProgressChanged(WebView view, int progress) {
724                 progressBar.setProgress(progress);
725                 if (progress < 100) {
726                     progressBar.setVisibility(View.VISIBLE);
727                 } else {
728                     progressBar.setVisibility(View.GONE);
729
730                     //Stop the `SwipeToRefresh` indicator if it is running
731                     swipeRefreshLayout.setRefreshing(false);
732                 }
733             }
734
735             // Set the favorite icon when it changes.
736             @Override
737             public void onReceivedIcon(WebView view, Bitmap icon) {
738                 // Only update the favorite icon if the website has finished loading.
739                 if (progressBar.getVisibility() == View.GONE) {
740                     // Save a copy of the favorite icon.
741                     favoriteIconBitmap = icon;
742
743                     // Place the favorite icon in the appBar.
744                     favoriteIconImageView.setImageBitmap(Bitmap.createScaledBitmap(icon, 64, 64, true));
745                 }
746             }
747
748             // Save a copy of the title when it changes.
749             @Override
750             public void onReceivedTitle(WebView view, String title) {
751                 // Save a copy of the title.
752                 webViewTitle = title;
753             }
754
755             // Enter full screen video
756             @Override
757             public void onShowCustomView(View view, CustomViewCallback callback) {
758                 // Pause the ad if this is the free flavor.
759                 if (BuildConfig.FLAVOR.contentEquals("free")) {
760                     BannerAd.pauseAd(adView);
761                 }
762
763                 // Remove the translucent overlays.
764                 getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
765
766                 // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
767                 drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
768
769                 /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
770                  * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
771                  * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically rehides them after they are shown.
772                  */
773                 rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
774
775                 // Set `rootCoordinatorLayout` to fill the entire screen.
776                 rootCoordinatorLayout.setFitsSystemWindows(false);
777
778                 // Add `view` to `fullScreenVideoFrameLayout` and display it on the screen.
779                 fullScreenVideoFrameLayout.addView(view);
780                 fullScreenVideoFrameLayout.setVisibility(View.VISIBLE);
781             }
782
783             // Exit full screen video
784             public void onHideCustomView() {
785                 // Hide `fullScreenVideoFrameLayout`.
786                 fullScreenVideoFrameLayout.removeAllViews();
787                 fullScreenVideoFrameLayout.setVisibility(View.GONE);
788
789                 // Add the translucent status flag.  This also resets `drawerLayout's` `View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN`.
790                 getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
791
792                 // Set `rootCoordinatorLayout` to fit inside the status and navigation bars.  This also clears the `SYSTEM_UI` flags.
793                 rootCoordinatorLayout.setFitsSystemWindows(true);
794
795                 // Show the ad if this is the free flavor.
796                 if (BuildConfig.FLAVOR.contentEquals("free")) {
797                     // Reload the ad.  Because the screen may have rotated, we need to use `reloadAfterRotate`.
798                     BannerAd.reloadAfterRotate(adView, getApplicationContext(), getString(R.string.ad_id));
799
800                     // Reinitialize the `adView` variable, as the `View` will have been removed and re-added by `BannerAd.reloadAfterRotate()`.
801                     adView = findViewById(R.id.adview);
802                 }
803             }
804         });
805
806         // Register `mainWebView` for a context menu.  This is used to see link targets and download images.
807         registerForContextMenu(mainWebView);
808
809         // Allow the downloading of files.
810         mainWebView.setDownloadListener(new DownloadListener() {
811             @Override
812             public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {
813                 // Show the `DownloadFileDialog` `AlertDialog` and name this instance `@string/download`.
814                 AppCompatDialogFragment downloadFileDialogFragment = DownloadFileDialog.fromUrl(url, contentDisposition, contentLength);
815                 downloadFileDialogFragment.show(getSupportFragmentManager(), getResources().getString(R.string.download));
816             }
817         });
818
819         // Allow pinch to zoom.
820         mainWebView.getSettings().setBuiltInZoomControls(true);
821
822         // Hide zoom controls.
823         mainWebView.getSettings().setDisplayZoomControls(false);
824
825         // Set `mainWebView` to use a wide viewport.  Otherwise, some web pages will be scrunched and some content will render outside the screen.
826         mainWebView.getSettings().setUseWideViewPort(true);
827
828         // Set `mainWebView` to load in overview mode (zoomed out to the maximum width).
829         mainWebView.getSettings().setLoadWithOverviewMode(true);
830
831         // Initialize cookieManager.
832         cookieManager = CookieManager.getInstance();
833
834         // 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).
835         customHeaders.put("X-Requested-With", "");
836
837         // 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.
838         PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
839
840         // Get the intent that started the app.
841         final Intent launchingIntent = getIntent();
842
843         // Extract the launching intent data as `launchingIntentUriData`.
844         final Uri launchingIntentUriData = launchingIntent.getData();
845
846         // Convert the launching intent URI data (if it exists) to a string and store it in `formattedUrlString`.
847         if (launchingIntentUriData != null) {
848             formattedUrlString = launchingIntentUriData.toString();
849         }
850
851         // Get a handle for the `Runtime`.
852         privacyBrowserRuntime = Runtime.getRuntime();
853
854         // Store the application's private data directory.
855         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`.
856
857         // Initialize `inFullScreenBrowsingMode`, which is always false at this point because Privacy Browser never starts in full screen browsing mode.
858         inFullScreenBrowsingMode = false;
859
860         // Initialize AdView for the free flavor.
861         adView = findViewById(R.id.adview);
862
863         // Initialize the privacy settings variables.
864         javaScriptEnabled = false;
865         firstPartyCookiesEnabled = false;
866         thirdPartyCookiesEnabled = false;
867         domStorageEnabled = false;
868         saveFormDataEnabled = false;
869
870         // Initialize `webViewTitle`.
871         webViewTitle = getString(R.string.no_title);
872
873         // Initialize `favoriteIconBitmap`.  We have to use `ContextCompat` until API >= 21.
874         Drawable favoriteIconDrawable = ContextCompat.getDrawable(getApplicationContext(), R.drawable.world);
875         BitmapDrawable favoriteIconBitmapDrawable = (BitmapDrawable) favoriteIconDrawable;
876         favoriteIconDefaultBitmap = favoriteIconBitmapDrawable.getBitmap();
877
878         // If the favorite icon is null, load the default.
879         if (favoriteIconBitmap == null) {
880             favoriteIconBitmap = favoriteIconDefaultBitmap;
881         }
882
883         // Apply the app settings from the shared preferences.
884         applyAppSettings();
885
886         // Load `formattedUrlString` if we are not waiting for Orbot to connect.
887         if (!waitingForOrbot) {
888             loadUrl(formattedUrlString);
889         }
890     }
891
892
893     @Override
894     protected void onNewIntent(Intent intent) {
895         // Sets the new intent as the activity intent, so that any future `getIntent()`s pick up this one instead of creating a new activity.
896         setIntent(intent);
897
898         if (intent.getData() != null) {
899             // Get the intent data and convert it to a string.
900             final Uri intentUriData = intent.getData();
901             formattedUrlString = intentUriData.toString();
902         }
903
904         // Close the navigation drawer if it is open.
905         if (drawerLayout.isDrawerVisible(GravityCompat.START)) {
906             drawerLayout.closeDrawer(GravityCompat.START);
907         }
908
909         // Load the website.
910         loadUrl(formattedUrlString);
911
912         // Clear the keyboard if displayed and remove the focus on the urlTextBar if it has it.
913         mainWebView.requestFocus();
914     }
915
916     @Override
917     public boolean onCreateOptionsMenu(Menu menu) {
918         // Inflate the menu; this adds items to the action bar if it is present.
919         getMenuInflater().inflate(R.menu.webview_options_menu, menu);
920
921         // Set mainMenu so it can be used by `onOptionsItemSelected()` and `updatePrivacyIcons`.
922         mainMenu = menu;
923
924         // Set the initial status of the privacy icons.  `false` does not call `invalidateOptionsMenu` as the last step.
925         updatePrivacyIcons(false);
926
927         // Get handles for the menu items.
928         MenuItem toggleFirstPartyCookies = menu.findItem(R.id.toggleFirstPartyCookies);
929         MenuItem toggleThirdPartyCookies = menu.findItem(R.id.toggleThirdPartyCookies);
930         MenuItem toggleDomStorage = menu.findItem(R.id.toggleDomStorage);
931         MenuItem toggleSaveFormData = menu.findItem(R.id.toggleSaveFormData);
932
933         // Only display third-party cookies if SDK >= 21
934         toggleThirdPartyCookies.setVisible(Build.VERSION.SDK_INT >= 21);
935
936         // Get the shared preference values.  `this` references the current context.
937         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
938
939         // Set the status of the additional app bar icons.  The default is `false`.
940         if (sharedPreferences.getBoolean("display_additional_app_bar_icons", false)) {
941             toggleFirstPartyCookies.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
942             toggleDomStorage.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
943             toggleSaveFormData.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
944         } else { //Do not display the additional icons.
945             toggleFirstPartyCookies.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
946             toggleDomStorage.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
947             toggleSaveFormData.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
948         }
949
950         return true;
951     }
952
953     @Override
954     public boolean onPrepareOptionsMenu(Menu menu) {
955         // Get handles for the menu items.
956         MenuItem toggleFirstPartyCookies = menu.findItem(R.id.toggleFirstPartyCookies);
957         MenuItem toggleThirdPartyCookies = menu.findItem(R.id.toggleThirdPartyCookies);
958         MenuItem toggleDomStorage = menu.findItem(R.id.toggleDomStorage);
959         MenuItem toggleSaveFormData = menu.findItem(R.id.toggleSaveFormData);
960         MenuItem clearCookies = menu.findItem(R.id.clearCookies);
961         MenuItem clearFormData = menu.findItem(R.id.clearFormData);
962         MenuItem refreshMenuItem = menu.findItem(R.id.refresh);
963
964         // Set the status of the menu item checkboxes.
965         toggleFirstPartyCookies.setChecked(firstPartyCookiesEnabled);
966         toggleThirdPartyCookies.setChecked(thirdPartyCookiesEnabled);
967         toggleDomStorage.setChecked(domStorageEnabled);
968         toggleSaveFormData.setChecked(saveFormDataEnabled);
969
970         // Enable third-party cookies if first-party cookies are enabled.
971         toggleThirdPartyCookies.setEnabled(firstPartyCookiesEnabled);
972
973         // Enable DOM Storage if JavaScript is enabled.
974         toggleDomStorage.setEnabled(javaScriptEnabled);
975
976         // Enable Clear Cookies if there are any.
977         clearCookies.setEnabled(cookieManager.hasCookies());
978
979         // Enable Clear Form Data is there is any.
980         WebViewDatabase mainWebViewDatabase = WebViewDatabase.getInstance(this);
981         clearFormData.setEnabled(mainWebViewDatabase.hasFormData());
982
983         // Only show `Refresh` if `swipeToRefresh` is disabled.
984         refreshMenuItem.setVisible(!swipeToRefreshEnabled);
985
986         // Initialize font size variables.
987         int fontSize = mainWebView.getSettings().getTextZoom();
988         String fontSizeTitle;
989         MenuItem selectedFontSizeMenuItem;
990
991         // Prepare the font size title and current size menu item.
992         switch (fontSize) {
993             case 25:
994                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.twenty_five_percent);
995                 selectedFontSizeMenuItem = menu.findItem(R.id.fontSizeTwentyFivePercent);
996                 break;
997
998             case 50:
999                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.fifty_percent);
1000                 selectedFontSizeMenuItem = menu.findItem(R.id.fontSizeFiftyPercent);
1001                 break;
1002
1003             case 75:
1004                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.seventy_five_percent);
1005                 selectedFontSizeMenuItem = menu.findItem(R.id.fontSizeSeventyFivePercent);
1006                 break;
1007
1008             case 100:
1009                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.one_hundred_percent);
1010                 selectedFontSizeMenuItem = menu.findItem(R.id.fontSizeOneHundredPercent);
1011                 break;
1012
1013             case 125:
1014                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.one_hundred_twenty_five_percent);
1015                 selectedFontSizeMenuItem = menu.findItem(R.id.fontSizeOneHundredTwentyFivePercent);
1016                 break;
1017
1018             case 150:
1019                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.one_hundred_fifty_percent);
1020                 selectedFontSizeMenuItem = menu.findItem(R.id.fontSizeOneHundredFiftyPercent);
1021                 break;
1022
1023             case 175:
1024                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.one_hundred_seventy_five_percent);
1025                 selectedFontSizeMenuItem = menu.findItem(R.id.fontSizeOneHundredSeventyFivePercent);
1026                 break;
1027
1028             case 200:
1029                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.two_hundred_percent);
1030                 selectedFontSizeMenuItem = menu.findItem(R.id.fontSizeTwoHundredPercent);
1031                 break;
1032
1033             default:
1034                 fontSizeTitle = getResources().getString(R.string.font_size) + " - " + getResources().getString(R.string.one_hundred_percent);
1035                 selectedFontSizeMenuItem = menu.findItem(R.id.fontSizeOneHundredPercent);
1036                 break;
1037         }
1038
1039         // Set the font size title and select the current size menu item.
1040         MenuItem fontSizeMenuItem = menu.findItem(R.id.fontSize);
1041         fontSizeMenuItem.setTitle(fontSizeTitle);
1042         selectedFontSizeMenuItem.setChecked(true);
1043
1044         // Run all the other default commands.
1045         super.onPrepareOptionsMenu(menu);
1046
1047         // `return true` displays the menu.
1048         return true;
1049     }
1050
1051     @Override
1052     // Remove Android Studio's warning about the dangers of using SetJavaScriptEnabled.
1053     @SuppressLint("SetJavaScriptEnabled")
1054     // removeAllCookies is deprecated, but it is required for API < 21.
1055     @SuppressWarnings("deprecation")
1056     public boolean onOptionsItemSelected(MenuItem menuItem) {
1057         int menuItemId = menuItem.getItemId();
1058
1059         // Set the commands that relate to the menu entries.
1060         switch (menuItemId) {
1061             case R.id.toggleJavaScript:
1062                 // Switch the status of javaScriptEnabled.
1063                 javaScriptEnabled = !javaScriptEnabled;
1064
1065                 // Apply the new JavaScript status.
1066                 mainWebView.getSettings().setJavaScriptEnabled(javaScriptEnabled);
1067
1068                 // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
1069                 updatePrivacyIcons(true);
1070
1071                 // Display a `Snackbar`.
1072                 if (javaScriptEnabled) {  // JavaScrip is enabled.
1073                     Snackbar.make(findViewById(R.id.main_webview), R.string.javascript_enabled, Snackbar.LENGTH_SHORT).show();
1074                 } else if (firstPartyCookiesEnabled) {  // JavaScript is disabled, but first-party cookies are enabled.
1075                     Snackbar.make(findViewById(R.id.main_webview), R.string.javascript_disabled, Snackbar.LENGTH_SHORT).show();
1076                 } else {  // Privacy mode.
1077                     Snackbar.make(findViewById(R.id.main_webview), R.string.privacy_mode, Snackbar.LENGTH_SHORT).show();
1078                 }
1079
1080                 // Reload the WebView.
1081                 mainWebView.reload();
1082                 return true;
1083
1084             case R.id.toggleFirstPartyCookies:
1085                 // Switch the status of firstPartyCookiesEnabled.
1086                 firstPartyCookiesEnabled = !firstPartyCookiesEnabled;
1087
1088                 // Update the menu checkbox.
1089                 menuItem.setChecked(firstPartyCookiesEnabled);
1090
1091                 // Apply the new cookie status.
1092                 cookieManager.setAcceptCookie(firstPartyCookiesEnabled);
1093
1094                 // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
1095                 updatePrivacyIcons(true);
1096
1097                 // Display a `Snackbar`.
1098                 if (firstPartyCookiesEnabled) {  // First-party cookies are enabled.
1099                     Snackbar.make(findViewById(R.id.main_webview), R.string.first_party_cookies_enabled, Snackbar.LENGTH_SHORT).show();
1100                 } else if (javaScriptEnabled){  // JavaScript is still enabled.
1101                     Snackbar.make(findViewById(R.id.main_webview), R.string.first_party_cookies_disabled, Snackbar.LENGTH_SHORT).show();
1102                 } else {  // Privacy mode.
1103                     Snackbar.make(findViewById(R.id.main_webview), R.string.privacy_mode, Snackbar.LENGTH_SHORT).show();
1104                 }
1105
1106                 // Reload the WebView.
1107                 mainWebView.reload();
1108                 return true;
1109
1110             case R.id.toggleThirdPartyCookies:
1111                 if (Build.VERSION.SDK_INT >= 21) {
1112                     // Switch the status of thirdPartyCookiesEnabled.
1113                     thirdPartyCookiesEnabled = !thirdPartyCookiesEnabled;
1114
1115                     // Update the menu checkbox.
1116                     menuItem.setChecked(thirdPartyCookiesEnabled);
1117
1118                     // Apply the new cookie status.
1119                     cookieManager.setAcceptThirdPartyCookies(mainWebView, thirdPartyCookiesEnabled);
1120
1121                     // Display a `Snackbar`.
1122                     if (thirdPartyCookiesEnabled) {
1123                         Snackbar.make(findViewById(R.id.main_webview), R.string.third_party_cookies_enabled, Snackbar.LENGTH_SHORT).show();
1124                     } else {
1125                         Snackbar.make(findViewById(R.id.main_webview), R.string.third_party_cookies_disabled, Snackbar.LENGTH_SHORT).show();
1126                     }
1127
1128                     // Reload the WebView.
1129                     mainWebView.reload();
1130                 } // Else do nothing because SDK < 21.
1131                 return true;
1132
1133             case R.id.toggleDomStorage:
1134                 // Switch the status of domStorageEnabled.
1135                 domStorageEnabled = !domStorageEnabled;
1136
1137                 // Update the menu checkbox.
1138                 menuItem.setChecked(domStorageEnabled);
1139
1140                 // Apply the new DOM Storage status.
1141                 mainWebView.getSettings().setDomStorageEnabled(domStorageEnabled);
1142
1143                 // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
1144                 updatePrivacyIcons(true);
1145
1146                 // Display a `Snackbar`.
1147                 if (domStorageEnabled) {
1148                     Snackbar.make(findViewById(R.id.main_webview), R.string.dom_storage_enabled, Snackbar.LENGTH_SHORT).show();
1149                 } else {
1150                     Snackbar.make(findViewById(R.id.main_webview), R.string.dom_storage_disabled, Snackbar.LENGTH_SHORT).show();
1151                 }
1152
1153                 // Reload the WebView.
1154                 mainWebView.reload();
1155                 return true;
1156
1157             case R.id.toggleSaveFormData:
1158                 // Switch the status of saveFormDataEnabled.
1159                 saveFormDataEnabled = !saveFormDataEnabled;
1160
1161                 // Update the menu checkbox.
1162                 menuItem.setChecked(saveFormDataEnabled);
1163
1164                 // Apply the new form data status.
1165                 mainWebView.getSettings().setSaveFormData(saveFormDataEnabled);
1166
1167                 // Display a `Snackbar`.
1168                 if (saveFormDataEnabled) {
1169                     Snackbar.make(findViewById(R.id.main_webview), R.string.form_data_enabled, Snackbar.LENGTH_SHORT).show();
1170                 } else {
1171                     Snackbar.make(findViewById(R.id.main_webview), R.string.form_data_disabled, Snackbar.LENGTH_SHORT).show();
1172                 }
1173
1174                 // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
1175                 updatePrivacyIcons(true);
1176
1177                 // Reload the WebView.
1178                 mainWebView.reload();
1179                 return true;
1180
1181             case R.id.clearCookies:
1182                 if (Build.VERSION.SDK_INT < 21) {
1183                     cookieManager.removeAllCookie();
1184                 } else {
1185                     cookieManager.removeAllCookies(null);
1186                 }
1187                 Snackbar.make(findViewById(R.id.main_webview), R.string.cookies_deleted, Snackbar.LENGTH_SHORT).show();
1188                 return true;
1189
1190             case R.id.clearDomStorage:
1191                 WebStorage webStorage = WebStorage.getInstance();
1192                 webStorage.deleteAllData();
1193                 Snackbar.make(findViewById(R.id.main_webview), R.string.dom_storage_deleted, Snackbar.LENGTH_SHORT).show();
1194                 return true;
1195
1196             case R.id.clearFormData:
1197                 WebViewDatabase mainWebViewDatabase = WebViewDatabase.getInstance(this);
1198                 mainWebViewDatabase.clearFormData();
1199                 Snackbar.make(findViewById(R.id.main_webview), R.string.form_data_deleted, Snackbar.LENGTH_SHORT).show();
1200                 return true;
1201
1202             case R.id.fontSizeTwentyFivePercent:
1203                 mainWebView.getSettings().setTextZoom(25);
1204                 return true;
1205
1206             case R.id.fontSizeFiftyPercent:
1207                 mainWebView.getSettings().setTextZoom(50);
1208                 return true;
1209
1210             case R.id.fontSizeSeventyFivePercent:
1211                 mainWebView.getSettings().setTextZoom(75);
1212                 return true;
1213
1214             case R.id.fontSizeOneHundredPercent:
1215                 mainWebView.getSettings().setTextZoom(100);
1216                 return true;
1217
1218             case R.id.fontSizeOneHundredTwentyFivePercent:
1219                 mainWebView.getSettings().setTextZoom(125);
1220                 return true;
1221
1222             case R.id.fontSizeOneHundredFiftyPercent:
1223                 mainWebView.getSettings().setTextZoom(150);
1224                 return true;
1225
1226             case R.id.fontSizeOneHundredSeventyFivePercent:
1227                 mainWebView.getSettings().setTextZoom(175);
1228                 return true;
1229
1230             case R.id.fontSizeTwoHundredPercent:
1231                 mainWebView.getSettings().setTextZoom(200);
1232                 return true;
1233
1234             case R.id.share:
1235                 Intent shareIntent = new Intent();
1236                 shareIntent.setAction(Intent.ACTION_SEND);
1237                 shareIntent.putExtra(Intent.EXTRA_TEXT, urlTextBox.getText().toString());
1238                 shareIntent.setType("text/plain");
1239                 startActivity(Intent.createChooser(shareIntent, "Share URL"));
1240                 return true;
1241
1242             case R.id.find_on_page:
1243                 // Hide the URL app bar.
1244                 supportAppBar.setVisibility(View.GONE);
1245
1246                 // Show the Find on Page `RelativeLayout`.
1247                 findOnPageLinearLayout.setVisibility(View.VISIBLE);
1248
1249                 // Display the keyboard.  We have to wait 200 ms before running the command to work around a bug in Android.
1250                 // http://stackoverflow.com/questions/5520085/android-show-softkeyboard-with-showsoftinput-is-not-working
1251                 findOnPageEditText.postDelayed(new Runnable()
1252                 {
1253                     @Override
1254                     public void run()
1255                     {
1256                         // Set the focus on `findOnPageEditText`.
1257                         findOnPageEditText.requestFocus();
1258
1259                         // Display the keyboard.
1260                         inputMethodManager.showSoftInput(findOnPageEditText, 0);
1261                     }
1262                 }, 200);
1263                 return true;
1264
1265             case R.id.refresh:
1266                 mainWebView.reload();
1267                 return true;
1268
1269             case R.id.print:
1270                 // Get a `PrintManager` instance.
1271                 PrintManager printManager = (PrintManager) getSystemService(Context.PRINT_SERVICE);
1272
1273                 // Convert `mainWebView` to `printDocumentAdapter`.
1274                 PrintDocumentAdapter printDocumentAdapter = mainWebView.createPrintDocumentAdapter();
1275
1276                 // Print the document.  The print attributes are `null`.
1277                 printManager.print(getResources().getString(R.string.privacy_browser_web_page), printDocumentAdapter, null);
1278                 return true;
1279
1280             case R.id.addToHomescreen:
1281                 // Show the `CreateHomeScreenShortcutDialog` `AlertDialog` and name this instance `R.string.create_shortcut`.
1282                 AppCompatDialogFragment createHomeScreenShortcutDialogFragment = new CreateHomeScreenShortcutDialog();
1283                 createHomeScreenShortcutDialogFragment.show(getSupportFragmentManager(), getResources().getString(R.string.create_shortcut));
1284
1285                 //Everything else will be handled by `CreateHomeScreenShortcutDialog` and the associated listener below.
1286                 return true;
1287
1288             default:
1289                 // Don't consume the event.
1290                 return super.onOptionsItemSelected(menuItem);
1291         }
1292     }
1293
1294     // removeAllCookies is deprecated, but it is required for API < 21.
1295     @SuppressWarnings("deprecation")
1296     @Override
1297     public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
1298         int menuItemId = menuItem.getItemId();
1299
1300         switch (menuItemId) {
1301             case R.id.home:
1302                 loadUrl(homepage);
1303                 break;
1304
1305             case R.id.back:
1306                 if (mainWebView.canGoBack()) {
1307                     // Set `navigatingHistory` so that the domain settings are applied when the new URL is loaded.
1308                     navigatingHistory = true;
1309
1310                     // Load the previous website in the history.
1311                     mainWebView.goBack();
1312                 }
1313                 break;
1314
1315             case R.id.forward:
1316                 if (mainWebView.canGoForward()) {
1317                     // Set `navigatingHistory` so that the domain settings are applied when the new URL is loaded.
1318                     navigatingHistory = true;
1319
1320                     // Load the next website in the history.
1321                     mainWebView.goForward();
1322                 }
1323                 break;
1324
1325             case R.id.history:
1326                 // Get the `WebBackForwardList`.
1327                 WebBackForwardList webBackForwardList = mainWebView.copyBackForwardList();
1328
1329                 // Show the `UrlHistoryDialog` `AlertDialog` and name this instance `R.string.history`.  `this` is the `Context`.
1330                 AppCompatDialogFragment urlHistoryDialogFragment = UrlHistoryDialog.loadBackForwardList(this, webBackForwardList);
1331                 urlHistoryDialogFragment.show(getSupportFragmentManager(), getResources().getString(R.string.history));
1332                 break;
1333
1334             case R.id.bookmarks:
1335                 // Launch BookmarksActivity.
1336                 Intent bookmarksIntent = new Intent(this, BookmarksActivity.class);
1337                 startActivity(bookmarksIntent);
1338                 break;
1339
1340             case R.id.downloads:
1341                 // Launch the system Download Manager.
1342                 Intent downloadManagerIntent = new Intent(DownloadManager.ACTION_VIEW_DOWNLOADS);
1343
1344                 // Launch as a new task so that Download Manager and Privacy Browser show as separate windows in the recent tasks list.
1345                 downloadManagerIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
1346
1347                 startActivity(downloadManagerIntent);
1348                 break;
1349
1350             case R.id.settings:
1351                 // Reset `currentDomainName` so that domain settings are reapplied after returning to `MainWebViewActivity`.
1352                 currentDomainName = "";
1353
1354                 // Launch `SettingsActivity`.
1355                 Intent settingsIntent = new Intent(this, SettingsActivity.class);
1356                 startActivity(settingsIntent);
1357                 break;
1358
1359             case R.id.domains:
1360                 // Reset `currentDomainName` so that domain settings are reapplied after returning to `MainWebViewActivity`.
1361                 currentDomainName = "";
1362
1363                 // Launch `DomainsActivity`.
1364                 Intent domainsIntent = new Intent(this, DomainsActivity.class);
1365                 startActivity(domainsIntent);
1366                 break;
1367
1368             case R.id.guide:
1369                 // Launch `GuideActivity`.
1370                 Intent guideIntent = new Intent(this, GuideActivity.class);
1371                 startActivity(guideIntent);
1372                 break;
1373
1374             case R.id.about:
1375                 // Launch `AboutActivity`.
1376                 Intent aboutIntent = new Intent(this, AboutActivity.class);
1377                 startActivity(aboutIntent);
1378                 break;
1379
1380             case R.id.clearAndExit:
1381                 // Clear cookies.  The commands changed slightly in API 21.
1382                 if (Build.VERSION.SDK_INT >= 21) {
1383                     cookieManager.removeAllCookies(null);
1384                 } else {
1385                     cookieManager.removeAllCookie();
1386                 }
1387
1388                 // Clear DOM storage.
1389                 WebStorage domStorage = WebStorage.getInstance();
1390                 domStorage.deleteAllData();
1391
1392                 // Clear form data.
1393                 WebViewDatabase webViewDatabase = WebViewDatabase.getInstance(this);
1394                 webViewDatabase.clearFormData();
1395
1396                 // Clear the cache.  `true` includes disk files.
1397                 mainWebView.clearCache(true);
1398
1399                 // Clear the back/forward history.
1400                 mainWebView.clearHistory();
1401
1402                 // Clear any SSL certificate preferences.
1403                 mainWebView.clearSslPreferences();
1404
1405                 // Clear `formattedUrlString`.
1406                 formattedUrlString = null;
1407
1408                 // Clear `customHeaders`.
1409                 customHeaders.clear();
1410
1411                 // Detach all views from `mainWebViewRelativeLayout`.
1412                 mainWebViewRelativeLayout.removeAllViews();
1413
1414                 // Destroy the internal state of `mainWebView`.
1415                 mainWebView.destroy();
1416
1417                 // Manually delete cache folders.
1418                 try {
1419                     // Delete the main `cache` folder.
1420                     privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/cache");
1421
1422                     // 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`.
1423                     privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/app_webview");
1424                 } catch (IOException e) {
1425                     // Do nothing if an error is thrown.
1426                 }
1427
1428                 // Close Privacy Browser.  `finishAndRemoveTask` also removes Privacy Browser from the recent app list.
1429                 if (Build.VERSION.SDK_INT >= 21) {
1430                     finishAndRemoveTask();
1431                 } else {
1432                     finish();
1433                 }
1434
1435                 // Remove the terminated program from RAM.  The status code is `0`.
1436                 System.exit(0);
1437                 break;
1438
1439             default:
1440                 break;
1441         }
1442
1443         // Close the navigation drawer.
1444         drawerLayout.closeDrawer(GravityCompat.START);
1445         return true;
1446     }
1447
1448     @Override
1449     public void onPostCreate(Bundle savedInstanceState) {
1450         super.onPostCreate(savedInstanceState);
1451
1452         // Sync the state of the DrawerToggle after onRestoreInstanceState has finished.
1453         drawerToggle.syncState();
1454     }
1455
1456     @Override
1457     public void onConfigurationChanged(Configuration newConfig) {
1458         super.onConfigurationChanged(newConfig);
1459
1460         // Reload the ad for the free flavor if we are not in full screen mode.
1461         if (BuildConfig.FLAVOR.contentEquals("free") && !inFullScreenBrowsingMode) {
1462             // Reload the ad.
1463             BannerAd.reloadAfterRotate(adView, getApplicationContext(), getString(R.string.ad_id));
1464
1465             // Reinitialize the `adView` variable, as the `View` will have been removed and re-added by `BannerAd.reloadAfterRotate()`.
1466             adView = findViewById(R.id.adview);
1467         }
1468
1469         // `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
1470         // ActivityCompat.invalidateOptionsMenu(this);
1471     }
1472
1473     @Override
1474     public void onCreateContextMenu(ContextMenu menu, View view, ContextMenu.ContextMenuInfo menuInfo) {
1475         // Store the `HitTestResult`.
1476         final WebView.HitTestResult hitTestResult = mainWebView.getHitTestResult();
1477
1478         // Create strings.
1479         final String imageUrl;
1480         final String linkUrl;
1481
1482         // Get a handle for the `ClipboardManager`.
1483         final ClipboardManager clipboardManager = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
1484
1485         switch (hitTestResult.getType()) {
1486             // `SRC_ANCHOR_TYPE` is a link.
1487             case WebView.HitTestResult.SRC_ANCHOR_TYPE:
1488                 // Get the target URL.
1489                 linkUrl = hitTestResult.getExtra();
1490
1491                 // Set the target URL as the title of the `ContextMenu`.
1492                 menu.setHeaderTitle(linkUrl);
1493
1494                 // Add a `Load URL` entry.
1495                 menu.add(R.string.load_url).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1496                     @Override
1497                     public boolean onMenuItemClick(MenuItem item) {
1498                         loadUrl(linkUrl);
1499                         return false;
1500                     }
1501                 });
1502
1503                 // Add a `Copy URL` entry.
1504                 menu.add(R.string.copy_url).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1505                     @Override
1506                     public boolean onMenuItemClick(MenuItem item) {
1507                         // Save the link URL in a `ClipData`.
1508                         ClipData srcAnchorTypeClipData = ClipData.newPlainText(getResources().getString(R.string.url), linkUrl);
1509
1510                         // Set the `ClipData` as the clipboard's primary clip.
1511                         clipboardManager.setPrimaryClip(srcAnchorTypeClipData);
1512                         return false;
1513                     }
1514                 });
1515
1516                 // Add a `Cancel` entry, which by default closes the `ContextMenu`.
1517                 menu.add(R.string.cancel);
1518                 break;
1519
1520             case WebView.HitTestResult.EMAIL_TYPE:
1521                 // Get the target URL.
1522                 linkUrl = hitTestResult.getExtra();
1523
1524                 // Set the target URL as the title of the `ContextMenu`.
1525                 menu.setHeaderTitle(linkUrl);
1526
1527                 // Add a `Write Email` entry.
1528                 menu.add(R.string.write_email).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1529                     @Override
1530                     public boolean onMenuItemClick(MenuItem item) {
1531                         // We use `ACTION_SENDTO` instead of `ACTION_SEND` so that only email programs are launched.
1532                         Intent emailIntent = new Intent(Intent.ACTION_SENDTO);
1533
1534                         // Parse the url and set it as the data for the `Intent`.
1535                         emailIntent.setData(Uri.parse("mailto:" + linkUrl));
1536
1537                         // `FLAG_ACTIVITY_NEW_TASK` opens the email program in a new task instead as part of Privacy Browser.
1538                         emailIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
1539
1540                         // Make it so.
1541                         startActivity(emailIntent);
1542                         return false;
1543                     }
1544                 });
1545
1546                 // Add a `Copy Email Address` entry.
1547                 menu.add(R.string.copy_email_address).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1548                     @Override
1549                     public boolean onMenuItemClick(MenuItem item) {
1550                         // Save the email address in a `ClipData`.
1551                         ClipData srcEmailTypeClipData = ClipData.newPlainText(getResources().getString(R.string.email_address), linkUrl);
1552
1553                         // Set the `ClipData` as the clipboard's primary clip.
1554                         clipboardManager.setPrimaryClip(srcEmailTypeClipData);
1555                         return false;
1556                     }
1557                 });
1558
1559                 // Add a `Cancel` entry, which by default closes the `ContextMenu`.
1560                 menu.add(R.string.cancel);
1561                 break;
1562
1563             // `IMAGE_TYPE` is an image.
1564             case WebView.HitTestResult.IMAGE_TYPE:
1565                 // Get the image URL.
1566                 imageUrl = hitTestResult.getExtra();
1567
1568                 // Set the image URL as the title of the `ContextMenu`.
1569                 menu.setHeaderTitle(imageUrl);
1570
1571                 // Add a `View Image` entry.
1572                 menu.add(R.string.view_image).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1573                     @Override
1574                     public boolean onMenuItemClick(MenuItem item) {
1575                         loadUrl(imageUrl);
1576                         return false;
1577                     }
1578                 });
1579
1580                 // Add a `Download Image` entry.
1581                 menu.add(R.string.download_image).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1582                     @Override
1583                     public boolean onMenuItemClick(MenuItem item) {
1584                         // Show the `DownloadImageDialog` `AlertDialog` and name this instance `@string/download`.
1585                         AppCompatDialogFragment downloadImageDialogFragment = DownloadImageDialog.imageUrl(imageUrl);
1586                         downloadImageDialogFragment.show(getSupportFragmentManager(), getResources().getString(R.string.download));
1587                         return false;
1588                     }
1589                 });
1590
1591                 // Add a `Copy URL` entry.
1592                 menu.add(R.string.copy_url).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1593                     @Override
1594                     public boolean onMenuItemClick(MenuItem item) {
1595                         // Save the image URL in a `ClipData`.
1596                         ClipData srcImageTypeClipData = ClipData.newPlainText(getResources().getString(R.string.url), imageUrl);
1597
1598                         // Set the `ClipData` as the clipboard's primary clip.
1599                         clipboardManager.setPrimaryClip(srcImageTypeClipData);
1600                         return false;
1601                     }
1602                 });
1603
1604                 // Add a `Cancel` entry, which by default closes the `ContextMenu`.
1605                 menu.add(R.string.cancel);
1606                 break;
1607
1608
1609             // `SRC_IMAGE_ANCHOR_TYPE` is an image that is also a link.
1610             case WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE:
1611                 // Get the image URL.
1612                 imageUrl = hitTestResult.getExtra();
1613
1614                 // Set the image URL as the title of the `ContextMenu`.
1615                 menu.setHeaderTitle(imageUrl);
1616
1617                 // Add a `View Image` entry.
1618                 menu.add(R.string.view_image).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1619                     @Override
1620                     public boolean onMenuItemClick(MenuItem item) {
1621                         loadUrl(imageUrl);
1622                         return false;
1623                     }
1624                 });
1625
1626                 // Add a `Download Image` entry.
1627                 menu.add(R.string.download_image).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1628                     @Override
1629                     public boolean onMenuItemClick(MenuItem item) {
1630                         // Show the `DownloadImageDialog` `AlertDialog` and name this instance `@string/download`.
1631                         AppCompatDialogFragment downloadImageDialogFragment = DownloadImageDialog.imageUrl(imageUrl);
1632                         downloadImageDialogFragment.show(getSupportFragmentManager(), getResources().getString(R.string.download));
1633                         return false;
1634                     }
1635                 });
1636
1637                 // Add a `Copy URL` entry.
1638                 menu.add(R.string.copy_url).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
1639                     @Override
1640                     public boolean onMenuItemClick(MenuItem item) {
1641                         // Save the image URL in a `ClipData`.
1642                         ClipData srcImageAnchorTypeClipData = ClipData.newPlainText(getResources().getString(R.string.url), imageUrl);
1643
1644                         // Set the `ClipData` as the clipboard's primary clip.
1645                         clipboardManager.setPrimaryClip(srcImageAnchorTypeClipData);
1646                         return false;
1647                     }
1648                 });
1649
1650                 // Add a `Cancel` entry, which by default closes the `ContextMenu`.
1651                 menu.add(R.string.cancel);
1652                 break;
1653         }
1654     }
1655
1656     @Override
1657     public void onCreateHomeScreenShortcut(AppCompatDialogFragment dialogFragment) {
1658         // Get shortcutNameEditText from the alert dialog.
1659         EditText shortcutNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.shortcut_name_edittext);
1660
1661         // Create the bookmark shortcut based on formattedUrlString.
1662         Intent bookmarkShortcut = new Intent();
1663         bookmarkShortcut.setAction(Intent.ACTION_VIEW);
1664         bookmarkShortcut.setData(Uri.parse(formattedUrlString));
1665
1666         // Place the bookmark shortcut on the home screen.
1667         Intent placeBookmarkShortcut = new Intent();
1668         placeBookmarkShortcut.putExtra("android.intent.extra.shortcut.INTENT", bookmarkShortcut);
1669         placeBookmarkShortcut.putExtra("android.intent.extra.shortcut.NAME", shortcutNameEditText.getText().toString());
1670         placeBookmarkShortcut.putExtra("android.intent.extra.shortcut.ICON", favoriteIconBitmap);
1671         placeBookmarkShortcut.setAction("com.android.launcher.action.INSTALL_SHORTCUT");
1672         sendBroadcast(placeBookmarkShortcut);
1673     }
1674
1675     @Override
1676     public void onDownloadImage(AppCompatDialogFragment dialogFragment, String imageUrl) {
1677         // Download the image if it has an HTTP or HTTPS URI.
1678         if (imageUrl.startsWith("http")) {
1679             // Get a handle for the system `DOWNLOAD_SERVICE`.
1680             DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
1681
1682             // Parse `imageUrl`.
1683             DownloadManager.Request downloadRequest = new DownloadManager.Request(Uri.parse(imageUrl));
1684
1685             // Pass cookies to download manager if cookies are enabled.  This is required to download images from websites that require a login.
1686             if (firstPartyCookiesEnabled) {
1687                 // Get the cookies for `imageUrl`.
1688                 String cookies = cookieManager.getCookie(imageUrl);
1689
1690                 // Add the cookies to `downloadRequest`.  In the HTTP request header, cookies are named `Cookie`.
1691                 downloadRequest.addRequestHeader("Cookie", cookies);
1692             }
1693
1694             // Get the file name from `dialogFragment`.
1695             EditText downloadImageNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.download_image_name);
1696             String imageName = downloadImageNameEditText.getText().toString();
1697
1698             // Once we have `WRITE_EXTERNAL_STORAGE` permissions we can use `setDestinationInExternalPublicDir`.
1699             if (Build.VERSION.SDK_INT >= 23) { // If API >= 23, set the download save in the the `DIRECTORY_DOWNLOADS` using `imageName`.
1700                 downloadRequest.setDestinationInExternalFilesDir(this, "/", imageName);
1701             } else { // Only set the title using `imageName`.
1702                 downloadRequest.setTitle(imageName);
1703             }
1704
1705             // Allow `MediaScanner` to index the download if it is a media file.
1706             downloadRequest.allowScanningByMediaScanner();
1707
1708             // Add the URL as the description for the download.
1709             downloadRequest.setDescription(imageUrl);
1710
1711             // Show the download notification after the download is completed.
1712             downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
1713
1714             // Initiate the download.
1715             downloadManager.enqueue(downloadRequest);
1716         } else {  // The image is not an HTTP or HTTPS URI.
1717             Snackbar.make(mainWebView, R.string.cannot_download_image, Snackbar.LENGTH_INDEFINITE).show();
1718         }
1719     }
1720
1721     @Override
1722     public void onDownloadFile(AppCompatDialogFragment dialogFragment, String downloadUrl) {
1723         // Download the file if it has an HTTP or HTTPS URI.
1724         if (downloadUrl.startsWith("http")) {
1725
1726             // Get a handle for the system `DOWNLOAD_SERVICE`.
1727             DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
1728
1729             // Parse `downloadUrl`.
1730             DownloadManager.Request downloadRequest = new DownloadManager.Request(Uri.parse(downloadUrl));
1731
1732             // Pass cookies to download manager if cookies are enabled.  This is required to download files from websites that require a login.
1733             if (firstPartyCookiesEnabled) {
1734                 // Get the cookies for `downloadUrl`.
1735                 String cookies = cookieManager.getCookie(downloadUrl);
1736
1737                 // Add the cookies to `downloadRequest`.  In the HTTP request header, cookies are named `Cookie`.
1738                 downloadRequest.addRequestHeader("Cookie", cookies);
1739             }
1740
1741             // Get the file name from `dialogFragment`.
1742             EditText downloadFileNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.download_file_name);
1743             String fileName = downloadFileNameEditText.getText().toString();
1744
1745             // Once we have `WRITE_EXTERNAL_STORAGE` permissions we can use `setDestinationInExternalPublicDir`.
1746             if (Build.VERSION.SDK_INT >= 23) { // If API >= 23, set the download location to `/sdcard/Android/data/com.stoutner.privacybrowser.standard/files` named `fileName`.
1747                 downloadRequest.setDestinationInExternalFilesDir(this, "/", fileName);
1748             } else { // Only set the title using `fileName`.
1749                 downloadRequest.setTitle(fileName);
1750             }
1751
1752             // Allow `MediaScanner` to index the download if it is a media file.
1753             downloadRequest.allowScanningByMediaScanner();
1754
1755             // Add the URL as the description for the download.
1756             downloadRequest.setDescription(downloadUrl);
1757
1758             // Show the download notification after the download is completed.
1759             downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
1760
1761             // Initiate the download.
1762             downloadManager.enqueue(downloadRequest);
1763         } else {  // The download is not an HTTP or HTTPS URI.
1764             Snackbar.make(mainWebView, R.string.cannot_download_file, Snackbar.LENGTH_INDEFINITE).show();
1765         }
1766     }
1767
1768     public void viewSslCertificate(View view) {
1769         // Show the `ViewSslCertificateDialog` `AlertDialog` and name this instance `@string/view_ssl_certificate`.
1770         DialogFragment viewSslCertificateDialogFragment = new ViewSslCertificateDialog();
1771         viewSslCertificateDialogFragment.show(getFragmentManager(), getResources().getString(R.string.view_ssl_certificate));
1772     }
1773
1774     @Override
1775     public void onSslErrorCancel() {
1776         sslErrorHandler.cancel();
1777     }
1778
1779     @Override
1780     public void onSslErrorProceed() {
1781         sslErrorHandler.proceed();
1782     }
1783
1784     @Override
1785     public void onUrlHistoryEntrySelected(int moveBackOrForwardSteps) {
1786         // Set `navigatingHistory` so that the domain settings are applied when the new URL is loaded.
1787         navigatingHistory = true;
1788
1789         // Load the history entry.
1790         mainWebView.goBackOrForward(moveBackOrForwardSteps);
1791     }
1792
1793     @Override
1794     public void onClearHistory() {
1795         // Clear the history.
1796         mainWebView.clearHistory();
1797     }
1798
1799     // Override `onBackPressed` to handle the navigation drawer and `mainWebView`.
1800     @Override
1801     public void onBackPressed() {
1802         // Close the navigation drawer if it is available.  GravityCompat.START is the drawer on the left on Left-to-Right layout text.
1803         if (drawerLayout.isDrawerVisible(GravityCompat.START)) {
1804             drawerLayout.closeDrawer(GravityCompat.START);
1805         } else {
1806             // Load the previous URL if available.
1807             if (mainWebView.canGoBack()) {
1808                 // Set `navigatingHistory` so that the domain settings are applied when the new URL is loaded.
1809                 navigatingHistory = true;
1810
1811                 // Go back.
1812                 mainWebView.goBack();
1813             } else {
1814                 // Pass `onBackPressed()` to the system.
1815                 super.onBackPressed();
1816             }
1817         }
1818     }
1819
1820     @Override
1821     public void onPause() {
1822         // Pause `mainWebView`.
1823         mainWebView.onPause();
1824
1825         // Stop all JavaScript.
1826         mainWebView.pauseTimers();
1827
1828         // Pause the adView or it will continue to consume resources in the background on the free flavor.
1829         if (BuildConfig.FLAVOR.contentEquals("free")) {
1830             BannerAd.pauseAd(adView);
1831         }
1832
1833         super.onPause();
1834     }
1835
1836     @Override
1837     public void onResume() {  // `onResume()` also runs every time the app starts after `onCreate()` and `onStart()`.
1838         super.onResume();
1839
1840         // Resume JavaScript (if enabled).
1841         mainWebView.resumeTimers();
1842
1843         // Resume `mainWebView`.
1844         mainWebView.onResume();
1845
1846         // Resume the adView for the free flavor.
1847         if (BuildConfig.FLAVOR.contentEquals("free")) {
1848             BannerAd.resumeAd(adView);
1849         }
1850     }
1851
1852     @Override
1853     public void onRestart() {
1854         super.onRestart();
1855
1856         // Apply the settings from shared preferences, which might have been changed in `SettingsActivity`.
1857         applyAppSettings();
1858
1859         // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
1860         updatePrivacyIcons(true);
1861
1862     }
1863
1864     private void loadUrlFromTextBox() throws UnsupportedEncodingException {
1865         // Get the text from urlTextBox and convert it to a string.  trim() removes white spaces from the beginning and end of the string.
1866         String unformattedUrlString = urlTextBox.getText().toString().trim();
1867
1868         // Check to see if `unformattedUrlString` is a valid URL.  Otherwise, convert it into a search.
1869         if ((Patterns.WEB_URL.matcher(unformattedUrlString).matches()) || (unformattedUrlString.startsWith("http://")) || (unformattedUrlString.startsWith("https://"))) {
1870             // Add `http://` at the beginning if it is missing.  Otherwise the app will segfault.
1871             if (!unformattedUrlString.startsWith("http")) {
1872                 unformattedUrlString = "http://" + unformattedUrlString;
1873             }
1874
1875             // Initialize `unformattedUrl`.
1876             URL unformattedUrl = null;
1877
1878             // 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.
1879             try {
1880                 unformattedUrl = new URL(unformattedUrlString);
1881             } catch (MalformedURLException e) {
1882                 e.printStackTrace();
1883             }
1884
1885             // The ternary operator (? :) makes sure that a null pointer exception is not thrown, which would happen if `.get` was called on a `null` value.
1886             final String scheme = unformattedUrl != null ? unformattedUrl.getProtocol() : null;
1887             final String authority = unformattedUrl != null ? unformattedUrl.getAuthority() : null;
1888             final String path = unformattedUrl != null ? unformattedUrl.getPath() : null;
1889             final String query = unformattedUrl != null ? unformattedUrl.getQuery() : null;
1890             final String fragment = unformattedUrl != null ? unformattedUrl.getRef() : null;
1891
1892             // Build the URI.
1893             Uri.Builder formattedUri = new Uri.Builder();
1894             formattedUri.scheme(scheme).authority(authority).path(path).query(query).fragment(fragment);
1895
1896             // Decode `formattedUri` as a `String` in `UTF-8`.
1897             formattedUrlString = URLDecoder.decode(formattedUri.build().toString(), "UTF-8");
1898         } else {
1899             // Sanitize the search input and convert it to a search.
1900             final String encodedUrlString = URLEncoder.encode(unformattedUrlString, "UTF-8");
1901
1902             // Add the base search URL.
1903             formattedUrlString = searchURL + encodedUrlString;
1904         }
1905
1906         loadUrl(formattedUrlString);
1907
1908         // Hide the keyboard so we can see the webpage.  `0` indicates no additional flags.
1909         inputMethodManager.hideSoftInputFromWindow(mainWebView.getWindowToken(), 0);
1910     }
1911
1912
1913     private void loadUrl(String url) {
1914         // Apply any custom domain settings.
1915         applyDomainSettings(url);
1916
1917         // Load the URL.
1918         mainWebView.loadUrl(url, customHeaders);
1919     }
1920
1921     // We have to use the deprecated `.getDrawable()` until the minimum API >= 21.
1922     @SuppressWarnings("deprecation")
1923     private void applyDomainSettings(String url) {
1924         // Reset `navigatingHistory`.
1925         navigatingHistory = false;
1926
1927         // Parse the URL into a URI.
1928         Uri uri = Uri.parse(url);
1929
1930         // Extract the domain from `uri`.
1931         String hostName = uri.getHost();
1932
1933         // Initialize `loadingNewDomainName`.
1934         boolean loadingNewDomainName;
1935
1936         // If either `hostName` or `currentDomainName` are `null`, run the options for loading a new domain name.
1937         // The lint suggestion to simplify the `if` statement is incorrect, because `hostName.equals(currentDomainName)` can produce a `null object reference.`
1938         //noinspection SimplifiableIfStatement
1939         if ((hostName == null) || (currentDomainName == null)) {
1940             loadingNewDomainName = true;
1941         } else {  // Determine if `hostName` equals `currentDomainName`.
1942             loadingNewDomainName = !hostName.equals(currentDomainName);
1943         }
1944
1945         // 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.
1946         if (loadingNewDomainName) {
1947             // Set the new `hostname` as the `currentDomainName`.
1948             currentDomainName = hostName;
1949
1950             // Reset `favoriteIconBitmap` and display it in the `appbar`.
1951             favoriteIconBitmap = favoriteIconDefaultBitmap;
1952             favoriteIconImageView.setImageBitmap(Bitmap.createScaledBitmap(favoriteIconBitmap, 64, 64, true));
1953
1954             // Initialize the database handler.  `this` specifies the context.  The two `nulls` do not specify the database name or a `CursorFactory`.
1955             // The `0` specifies the database version, but that is ignored and set instead using a constant in `DomainsDatabaseHelper`.
1956             DomainsDatabaseHelper domainsDatabaseHelper = new DomainsDatabaseHelper(this, null, null, 0);
1957
1958             // Get a full cursor from `domainsDatabaseHelper`.
1959             Cursor domainNameCursor = domainsDatabaseHelper.getDomainNameCursorOrderedByDomain();
1960
1961             // Initialize `domainSettingsSet`.
1962             Set<String> domainSettingsSet = new HashSet<>();
1963
1964             // Get the domain name column index.
1965             int domainNameColumnIndex = domainNameCursor.getColumnIndex(DomainsDatabaseHelper.DOMAIN_NAME);
1966
1967             // Populate `domainSettingsSet`.
1968             for (int i = 0; i < domainNameCursor.getCount(); i++) {
1969                 // Move `domainsCursor` to the current row.
1970                 domainNameCursor.moveToPosition(i);
1971
1972                 // Store the domain name in `domainSettingsSet`.
1973                 domainSettingsSet.add(domainNameCursor.getString(domainNameColumnIndex));
1974             }
1975
1976             // Close `domainNameCursor.
1977             domainNameCursor.close();
1978
1979             // Initialize variables to track if this domain has stored domain settings, and if so, under which name.
1980             boolean hostHasDomainSettings = false;
1981             String domainNameInDatabase = null;
1982
1983             // Check the hostname.
1984             if (domainSettingsSet.contains(hostName)) {
1985                 hostHasDomainSettings = true;
1986                 domainNameInDatabase = hostName;
1987             }
1988
1989             // If `hostName` is not `null`, check all the subdomains of `hostName` against wildcard domains in `domainCursor`.
1990             if (hostName != null) {
1991                 while (hostName.contains(".") && !hostHasDomainSettings) {  // Stop checking if we run out of  `.` or if we already know that `hostHasDomainSettings` is `true`.
1992                     if (domainSettingsSet.contains("*." + hostName)) {  // Check the host name prepended by `*.`.
1993                         hostHasDomainSettings = true;
1994                         domainNameInDatabase = "*." + hostName;
1995                     }
1996
1997                     // Strip out the lowest subdomain of `host`.
1998                     hostName = hostName.substring(hostName.indexOf(".") + 1);
1999                 }
2000             }
2001
2002             if (hostHasDomainSettings) {  // The url we are loading has custom domain settings.
2003                 // Get a cursor for the current host and move it to the first position.
2004                 Cursor currentHostDomainSettingsCursor = domainsDatabaseHelper.getCursorForDomainName(domainNameInDatabase);
2005                 currentHostDomainSettingsCursor.moveToFirst();
2006
2007                 // Get the settings from the cursor.
2008                 javaScriptEnabled = (currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_JAVASCRIPT)) == 1);
2009                 firstPartyCookiesEnabled = (currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_FIRST_PARTY_COOKIES)) == 1);
2010                 thirdPartyCookiesEnabled = (currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_THIRD_PARTY_COOKIES)) == 1);
2011                 domStorageEnabled = (currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_DOM_STORAGE)) == 1);
2012                 saveFormDataEnabled = (currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_FORM_DATA)) == 1);
2013                 String userAgentString = (currentHostDomainSettingsCursor.getString(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.USER_AGENT)));
2014                 int fontSize = (currentHostDomainSettingsCursor.getInt(currentHostDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.FONT_SIZE)));
2015
2016                 // Close `currentHostDomainSettingsCursor`.
2017                 currentHostDomainSettingsCursor.close();
2018
2019                 // Apply the domain settings.
2020                 mainWebView.getSettings().setJavaScriptEnabled(javaScriptEnabled);
2021                 cookieManager.setAcceptCookie(firstPartyCookiesEnabled);
2022                 mainWebView.getSettings().setDomStorageEnabled(domStorageEnabled);
2023                 mainWebView.getSettings().setSaveFormData(saveFormDataEnabled);
2024                 mainWebView.getSettings().setTextZoom(fontSize);
2025
2026                 // Set third-party cookies status if API >= 21.
2027                 if (Build.VERSION.SDK_INT >= 21) {
2028                     cookieManager.setAcceptThirdPartyCookies(mainWebView, thirdPartyCookiesEnabled);
2029                 }
2030
2031                 // Set the user agent.
2032                 if (userAgentString.equals("WebView default user agent")) {
2033                     // Set the user agent to `""`, which uses the default value.
2034                     mainWebView.getSettings().setUserAgentString("");
2035                 } else {
2036                     // Use the selected user agent.
2037                     mainWebView.getSettings().setUserAgentString(userAgentString);
2038                 }
2039
2040                 // 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.
2041                 urlAppBarRelativeLayout.setBackground(getResources().getDrawable(R.drawable.url_bar_background_green));
2042             } else {  // The URL we are loading does not have custom domain settings.  Load the defaults.
2043                 // Get the shared preference values.  `this` references the current context.
2044                 SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
2045
2046                 // Store the values from `sharedPreferences` in variables.
2047                 javaScriptEnabled = sharedPreferences.getBoolean("javascript_enabled", false);
2048                 firstPartyCookiesEnabled = sharedPreferences.getBoolean("first_party_cookies_enabled", false);
2049                 thirdPartyCookiesEnabled = sharedPreferences.getBoolean("third_party_cookies_enabled", false);
2050                 domStorageEnabled = sharedPreferences.getBoolean("dom_storage_enabled", false);
2051                 saveFormDataEnabled = sharedPreferences.getBoolean("save_form_data_enabled", false);
2052                 String userAgentString = sharedPreferences.getString("user_agent", "PrivacyBrowser/1.0");
2053                 String customUserAgentString = sharedPreferences.getString("custom_user_agent", "PrivacyBrowser/1.0");
2054                 String defaultFontSizeString = sharedPreferences.getString("default_font_size", "100");
2055
2056                 // Apply the default settings.
2057                 mainWebView.getSettings().setJavaScriptEnabled(javaScriptEnabled);
2058                 cookieManager.setAcceptCookie(firstPartyCookiesEnabled);
2059                 mainWebView.getSettings().setDomStorageEnabled(domStorageEnabled);
2060                 mainWebView.getSettings().setSaveFormData(saveFormDataEnabled);
2061                 mainWebView.getSettings().setTextZoom(Integer.valueOf(defaultFontSizeString));
2062
2063                 // Set third-party cookies status if API >= 21.
2064                 if (Build.VERSION.SDK_INT >= 21) {
2065                     cookieManager.setAcceptThirdPartyCookies(mainWebView, thirdPartyCookiesEnabled);
2066                 }
2067
2068                 // Set the default user agent.
2069                 switch (userAgentString) {
2070                     case "WebView default user agent":
2071                         // Set the user agent to `""`, which uses the default value.
2072                         mainWebView.getSettings().setUserAgentString("");
2073                         break;
2074
2075                     case "Custom user agent":
2076                         // Set the custom user agent.
2077                         mainWebView.getSettings().setUserAgentString(customUserAgentString);
2078                         break;
2079
2080                     default:
2081                         // Use the selected user agent.
2082                         mainWebView.getSettings().setUserAgentString(userAgentString);
2083                         break;
2084                 }
2085
2086                 // Set a transparent background on `urlTextBox`.  We have to use the deprecated `.getDrawable()` until the minimum API >= 21.
2087                 urlAppBarRelativeLayout.setBackgroundDrawable(getResources().getDrawable(R.drawable.url_bar_background_transparent));
2088             }
2089
2090             // Close `domainsDatabaseHelper`.
2091             domainsDatabaseHelper.close();
2092
2093             // Update the privacy icons, but only if `mainMenu` has already been populated.
2094             if (mainMenu != null) {
2095                 updatePrivacyIcons(true);
2096             }
2097         }
2098     }
2099
2100     public void findPreviousOnPage(View view) {
2101         // Go to the previous highlighted phrase on the page.  `false` goes backwards instead of forwards.
2102         mainWebView.findNext(false);
2103     }
2104
2105     public void findNextOnPage(View view) {
2106         // Go to the next highlighted phrase on the page. `true` goes forwards instead of backwards.
2107         mainWebView.findNext(true);
2108     }
2109
2110     public void closeFindOnPage(View view) {
2111         // Delete the contents of `find_on_page_edittext`.
2112         findOnPageEditText.setText(null);
2113
2114         // Clear the highlighted phrases.
2115         mainWebView.clearMatches();
2116
2117         // Hide the Find on Page `RelativeLayout`.
2118         findOnPageLinearLayout.setVisibility(View.GONE);
2119
2120         // Show the URL app bar.
2121         supportAppBar.setVisibility(View.VISIBLE);
2122
2123         // Hide the keyboard so we can see the webpage.  `0` indicates no additional flags.
2124         inputMethodManager.hideSoftInputFromWindow(mainWebView.getWindowToken(), 0);
2125     }
2126
2127     private void applyAppSettings() {
2128         // Get the shared preference values.  `this` references the current context.
2129         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
2130
2131         // Store the values from `sharedPreferences` in variables.
2132         String homepageString = sharedPreferences.getString("homepage", "https://duckduckgo.com");
2133         String torHomepageString = sharedPreferences.getString("tor_homepage", "https://3g2upl4pq6kufc4m.onion");
2134         String torSearchString = sharedPreferences.getString("tor_search", "https://3g2upl4pq6kufc4m.onion/html/?q=");
2135         String torSearchCustomURLString = sharedPreferences.getString("tor_search_custom_url", "");
2136         String searchString = sharedPreferences.getString("search", "https://duckduckgo.com/html/?q=");
2137         String searchCustomURLString = sharedPreferences.getString("search_custom_url", "");
2138         adBlockerEnabled = sharedPreferences.getBoolean("block_ads", true);
2139         incognitoModeEnabled = sharedPreferences.getBoolean("incognito_mode", false);
2140         boolean doNotTrackEnabled = sharedPreferences.getBoolean("do_not_track", false);
2141         boolean proxyThroughOrbot = sharedPreferences.getBoolean("proxy_through_orbot", false);
2142         fullScreenBrowsingModeEnabled = sharedPreferences.getBoolean("enable_full_screen_browsing_mode", false);
2143         hideSystemBarsOnFullscreen = sharedPreferences.getBoolean("hide_system_bars", false);
2144         translucentNavigationBarOnFullscreen = sharedPreferences.getBoolean("translucent_navigation_bar", true);
2145         swipeToRefreshEnabled = sharedPreferences.getBoolean("swipe_to_refresh", false);
2146
2147         // Set the homepage, search, and proxy options.
2148         if (proxyThroughOrbot) {  // Set the Tor options.
2149             // Set `torHomepageString` as `homepage`.
2150             homepage = torHomepageString;
2151
2152             // If formattedUrlString is null assign the homepage to it.
2153             if (formattedUrlString == null) {
2154                 formattedUrlString = homepage;
2155             }
2156
2157             // Set the search URL.
2158             if (torSearchString.equals("Custom URL")) {  // Get the custom URL string.
2159                 searchURL = torSearchCustomURLString;
2160             } else {  // Use the string from the pre-built list.
2161                 searchURL = torSearchString;
2162             }
2163
2164             // Set the proxy.  `this` refers to the current activity where an `AlertDialog` might be displayed.
2165             OrbotProxyHelper.setProxy(getApplicationContext(), this, "localhost", "8118");
2166
2167             // Display a message to the user if we are waiting on Orbot.
2168             if (!orbotStatus.equals("ON")) {
2169                 // Set `waitingForOrbot`.
2170                 waitingForOrbot = true;
2171
2172                 // Load a waiting page.  `null` specifies no encoding, which defaults to ASCII.
2173                 mainWebView.loadData(waitingForOrbotHTMLString, "text/html", null);
2174             }
2175         } else {  // Set the non-Tor options.
2176             // Set `homepageString` as `homepage`.
2177             homepage = homepageString;
2178
2179             // If formattedUrlString is null assign the homepage to it.
2180             if (formattedUrlString == null) {
2181                 formattedUrlString = homepage;
2182             }
2183
2184             // Set the search URL.
2185             if (searchString.equals("Custom URL")) {  // Get the custom URL string.
2186                 searchURL = searchCustomURLString;
2187             } else {  // Use the string from the pre-built list.
2188                 searchURL = searchString;
2189             }
2190
2191             // Reset the proxy to default.  The host is `""` and the port is `"0"`.
2192             OrbotProxyHelper.setProxy(getApplicationContext(), this, "", "0");
2193
2194             // Reset `waitingForOrbot.
2195             waitingForOrbot = false;
2196         }
2197
2198         // Set swipe to refresh.
2199         swipeRefreshLayout.setEnabled(swipeToRefreshEnabled);
2200
2201         // Set Do Not Track status.
2202         if (doNotTrackEnabled) {
2203             customHeaders.put("DNT", "1");
2204         } else {
2205             customHeaders.remove("DNT");
2206         }
2207
2208         // Apply the appropriate full screen mode the `SYSTEM_UI` flags.
2209         if (fullScreenBrowsingModeEnabled && inFullScreenBrowsingMode) {
2210             if (hideSystemBarsOnFullscreen) {  // Hide everything.
2211                 // Remove the translucent navigation setting if it is currently flagged.
2212                 getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
2213
2214                 // Remove the translucent status bar overlay.
2215                 getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
2216
2217                 // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
2218                 drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
2219
2220                 /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
2221                  * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
2222                  * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically rehides them after they are shown.
2223                  */
2224                 rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
2225             } else {  // Hide everything except the status and navigation bars.
2226                 // Add the translucent status flag if it is unset.
2227                 getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
2228
2229                 if (translucentNavigationBarOnFullscreen) {
2230                     // Set the navigation bar to be translucent.
2231                     getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
2232                 } else {
2233                     // Set the navigation bar to be black.
2234                     getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
2235                 }
2236             }
2237         } else {  // Switch to normal viewing mode.
2238             // Reset `inFullScreenBrowsingMode` to `false`.
2239             inFullScreenBrowsingMode = false;
2240
2241             // Show the `appBar` if `findOnPageLinearLayout` is not visible.
2242             if (findOnPageLinearLayout.getVisibility() == View.GONE) {
2243                 appBar.show();
2244             }
2245
2246             // Show the `BannerAd` in the free flavor.
2247             if (BuildConfig.FLAVOR.contentEquals("free")) {
2248                 // Reload the ad.  Because the screen may have rotated, we need to use `reloadAfterRotate`.
2249                 BannerAd.reloadAfterRotate(adView, getApplicationContext(), getString(R.string.ad_id));
2250
2251                 // Reinitialize the `adView` variable, as the `View` will have been removed and re-added by `BannerAd.reloadAfterRotate()`.
2252                 adView = findViewById(R.id.adview);
2253             }
2254
2255             // Remove the translucent navigation bar flag if it is set.
2256             getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
2257
2258             // Add the translucent status flag if it is unset.  This also resets `drawerLayout's` `View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN`.
2259             getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
2260
2261             // Remove any `SYSTEM_UI` flags from `rootCoordinatorLayout`.
2262             rootCoordinatorLayout.setSystemUiVisibility(0);
2263
2264             // Constrain `rootCoordinatorLayout` inside the status and navigation bars.
2265             rootCoordinatorLayout.setFitsSystemWindows(true);
2266         }
2267     }
2268
2269     private void updatePrivacyIcons(boolean runInvalidateOptionsMenu) {
2270         // Get handles for the icons.
2271         MenuItem privacyIcon = mainMenu.findItem(R.id.toggleJavaScript);
2272         MenuItem firstPartyCookiesIcon = mainMenu.findItem(R.id.toggleFirstPartyCookies);
2273         MenuItem domStorageIcon = mainMenu.findItem(R.id.toggleDomStorage);
2274         MenuItem formDataIcon = mainMenu.findItem(R.id.toggleSaveFormData);
2275
2276         // Update `privacyIcon`.
2277         if (javaScriptEnabled) {  // JavaScript is enabled.
2278             privacyIcon.setIcon(R.drawable.javascript_enabled);
2279         } else if (firstPartyCookiesEnabled) {  // JavaScript is disabled but cookies are enabled.
2280             privacyIcon.setIcon(R.drawable.warning);
2281         } else {  // All the dangerous features are disabled.
2282             privacyIcon.setIcon(R.drawable.privacy_mode);
2283         }
2284
2285         // Update `firstPartyCookiesIcon`.
2286         if (firstPartyCookiesEnabled) {  // First-party cookies are enabled.
2287             firstPartyCookiesIcon.setIcon(R.drawable.cookies_enabled);
2288         } else {  // First-party cookies are disabled.
2289             firstPartyCookiesIcon.setIcon(R.drawable.cookies_disabled);
2290         }
2291
2292         // Update `domStorageIcon`.
2293         if (javaScriptEnabled && domStorageEnabled) {  // Both JavaScript and DOM storage are enabled.
2294             domStorageIcon.setIcon(R.drawable.dom_storage_enabled);
2295         } else if (javaScriptEnabled) {  // JavaScript is enabled but DOM storage is disabled.
2296             domStorageIcon.setIcon(R.drawable.dom_storage_disabled);
2297         } else {  // JavaScript is disabled, so DOM storage is ghosted.
2298             domStorageIcon.setIcon(R.drawable.dom_storage_ghosted);
2299         }
2300
2301         // Update `formDataIcon`.
2302         if (saveFormDataEnabled) {  // Form data is enabled.
2303             formDataIcon.setIcon(R.drawable.form_data_enabled);
2304         } else {  // Form data is disabled.
2305             formDataIcon.setIcon(R.drawable.form_data_disabled);
2306         }
2307
2308         // `invalidateOptionsMenu` calls `onPrepareOptionsMenu()` and redraws the icons in the `AppBar`.  `this` references the current activity.
2309         if (runInvalidateOptionsMenu) {
2310             ActivityCompat.invalidateOptionsMenu(this);
2311         }
2312     }
2313 }