app/src/main/java/com/stoutner/privacybrowser/activities/DomainsActivity.java

   1 /*
   2  * Copyright © 2017-2019 Soren Stoutner <soren@stoutner.com>.
   3  *
   4  * This file is part of Privacy Browser <https://www.stoutner.com/privacy-browser>.
   5  *
   6  * Privacy Browser is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * Privacy Browser is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with Privacy Browser.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 package com.stoutner.privacybrowser.activities;
  21
  22 import android.annotation.SuppressLint;
  23 import android.app.Activity;
  24 import android.content.Context;
  25 import android.content.Intent;
  26 import android.content.res.Resources;
  27 import android.database.Cursor;
  28 import android.net.http.SslCertificate;
  29 import android.os.Bundle;
  30 import android.os.Handler;
  31 import android.view.Menu;
  32 import android.view.MenuItem;
  33 import android.view.View;
  34 import android.view.ViewGroup;
  35 import android.view.WindowManager;
  36 import android.widget.CursorAdapter;
  37 import android.widget.EditText;
  38 import android.widget.ListView;
  39 import android.widget.RadioButton;
  40 import android.widget.Spinner;
  41 import android.widget.Switch;
  42 import android.widget.TextView;
  43
  44 import androidx.appcompat.app.ActionBar;
  45 import androidx.appcompat.app.AppCompatActivity;
  46 import androidx.appcompat.widget.Toolbar;  // The AndroidX toolbar must be used until the minimum API is >= 21.
  47 import androidx.core.app.NavUtils;
  48 import androidx.fragment.app.DialogFragment;
  49 import androidx.fragment.app.FragmentManager;  // The AndroidX dialog fragment must be used or an error is produced on API <=22.
  50
  51 import com.google.android.material.floatingactionbutton.FloatingActionButton;
  52 import com.google.android.material.snackbar.Snackbar;
  53
  54 import com.stoutner.privacybrowser.R;
  55 import com.stoutner.privacybrowser.dialogs.AddDomainDialog;
  56 import com.stoutner.privacybrowser.fragments.DomainSettingsFragment;
  57 import com.stoutner.privacybrowser.fragments.DomainsListFragment;
  58 import com.stoutner.privacybrowser.helpers.DomainsDatabaseHelper;
  59
  60 import java.util.Objects;
  61
  62 public class DomainsActivity extends AppCompatActivity implements AddDomainDialog.AddDomainListener, DomainsListFragment.DismissSnackbarInterface {
  63     // `twoPanedMode` is public static so it can be accessed from `DomainsListFragment`.  It is also used in `onCreate()`, `onCreateOptionsMenu()`, and `populateDomainsListView()`.
  64     public static boolean twoPanedMode;
  65
  66     // `databaseId` is public static so it can be accessed from `DomainsListFragment`.  It is also used in `onCreateOptionsMenu()`, `saveDomainSettings()` and `populateDomainsListView()`.
  67     public static int currentDomainDatabaseId;
  68
  69     // `deleteMenuItem` is public static so it can be accessed from `DomainsListFragment`.  It is also used in `onCreateOptionsMenu()`, `onOptionsItemSelected()`, and `onBackPressed()`.
  70     public static MenuItem deleteMenuItem;
  71
  72     // `dismissingSnackbar` is public static so it can be accessed from `DomainsListFragment`.  It is also used in `onOptionsItemSelected()`.
  73     public static boolean dismissingSnackbar;
  74
  75     // `closeActivityAfterDismissingSnackbar` is used in `onOptionsItemSelected()`, and `onBackPressed()`.
  76     private boolean closeActivityAfterDismissingSnackbar;
  77
  78     // The undelete snackbar is used in `onOptionsItemSelected()` and `onBackPressed()`.
  79     private Snackbar undoDeleteSnackbar;
  80
  81     // `domainsDatabaseHelper` is used in `onCreate()`, `saveDomainSettings()`, and `onDestroy()`.
  82     private static DomainsDatabaseHelper domainsDatabaseHelper;
  83
  84     // `domainsListView` is used in `onCreate()` and `populateDomainsList()`.
  85     private ListView domainsListView;
  86
  87     // `addDomainFAB` is used in `onCreate()`, `onCreateOptionsMenu()`, `onOptionsItemSelected()`, and `onBackPressed()`.
  88     private FloatingActionButton addDomainFAB;
  89
  90     // `deletedDomainPosition` is used in an inner and outer class in `onOptionsItemSelected()`.
  91     private int deletedDomainPosition;
  92
  93     // `restartAfterRotate` is used in `onCreate()` and `onCreateOptionsMenu()`.
  94     private boolean restartAfterRotate;
  95
  96     // `domainSettingsDisplayedBeforeRotate` is used in `onCreate()` and `onCreateOptionsMenu()`.
  97     private boolean domainSettingsDisplayedBeforeRotate;
  98
  99     // `domainSettingsDatabaseIdBeforeRotate` is used in `onCreate()` and `onCreateOptionsMenu()`.
 100     private int domainSettingsDatabaseIdBeforeRotate;
 101
 102     // `goDirectlyToDatabaseId` is used in `onCreate()` and `onCreateOptionsMenu()`.
 103     private int goDirectlyToDatabaseId;
 104
 105     // `closeOnBack` is used in `onCreate()`, `onOptionsItemSelected()` and `onBackPressed()`.
 106     private boolean closeOnBack;
 107
 108     // `coordinatorLayout` is use in `onCreate()`, `onOptionsItemSelected()`, and `onSaveInstanceState()`.
 109     private View coordinatorLayout;
 110
 111     // `resources` is used in `onCreate()`, `onOptionsItemSelected()`, and `onSaveInstanceState()`.
 112     private Resources resources;
 113
 114     @Override
 115     protected void onCreate(Bundle savedInstanceState) {
 116         // Disable screenshots if not allowed.
 117         if (!MainWebViewActivity.allowScreenshots) {
 118             getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
 119         }
 120
 121         // Set the activity theme.
 122         if (MainWebViewActivity.darkTheme) {
 123             setTheme(R.style.PrivacyBrowserDark_SecondaryActivity);
 124         } else {
 125             setTheme(R.style.PrivacyBrowserLight_SecondaryActivity);
 126         }
 127
 128         // Run the default commands.
 129         super.onCreate(savedInstanceState);
 130
 131         // Extract the values from `savedInstanceState` if it is not `null`.
 132         if (savedInstanceState != null) {
 133             restartAfterRotate = true;
 134             domainSettingsDisplayedBeforeRotate = savedInstanceState.getBoolean("domainSettingsDisplayed");
 135             domainSettingsDatabaseIdBeforeRotate = savedInstanceState.getInt("domainSettingsDatabaseId");
 136         }
 137
 138         // Get the launching intent
 139         Intent intent = getIntent();
 140
 141         // Extract the domain to load if there is one.  `-1` is the default value.
 142         goDirectlyToDatabaseId = intent.getIntExtra("loadDomain", -1);
 143
 144         // Get the status of close-on-back, which is true when the domains activity is called from the options menu.
 145         closeOnBack = intent.getBooleanExtra("closeOnBack", false);
 146
 147         // Set the content view.
 148         setContentView(R.layout.domains_coordinatorlayout);
 149
 150         // Populate the class variables.
 151         coordinatorLayout = findViewById(R.id.domains_coordinatorlayout);
 152         resources = getResources();
 153
 154         // `SupportActionBar` from `android.support.v7.app.ActionBar` must be used until the minimum API is >= 21.
 155         final Toolbar toolbar = findViewById(R.id.domains_toolbar);
 156         setSupportActionBar(toolbar);
 157
 158         // Get a handle for the action bar.
 159         ActionBar actionBar = getSupportActionBar();
 160
 161         // Remove the incorrect lint warning that the action bar might be null.
 162         assert actionBar != null;
 163
 164         // Set the back arrow on the action bar.
 165         actionBar.setDisplayHomeAsUpEnabled(true);
 166
 167         // Initialize the database handler.  The `0` specifies the database version, but that is ignored and set instead using a constant in `DomainsDatabaseHelper`.
 168         domainsDatabaseHelper = new DomainsDatabaseHelper(this, null, null, 0);
 169
 170         // Determine if we are in two pane mode.  `domain_settings_fragment_container` does not exist on devices with a width less than 900dp.
 171         twoPanedMode = (findViewById(R.id.domain_settings_fragment_container) != null);
 172
 173         // Configure `addDomainFAB`.
 174         addDomainFAB = findViewById(R.id.add_domain_fab);
 175         addDomainFAB.setOnClickListener((View view) -> {
 176             // Show the add domain `AlertDialog`.
 177             DialogFragment addDomainDialog = new AddDomainDialog();
 178             addDomainDialog.show(getSupportFragmentManager(), resources.getString(R.string.add_domain));
 179         });
 180     }
 181
 182     @Override
 183     public boolean onCreateOptionsMenu(Menu menu) {
 184         // Inflate the menu.
 185         getMenuInflater().inflate(R.menu.domains_options_menu, menu);
 186
 187         // Store `deleteMenuItem` for future use.
 188         deleteMenuItem = menu.findItem(R.id.delete_domain);
 189
 190         // Only display `deleteMenuItem` (initially) in two-paned mode.
 191         deleteMenuItem.setVisible(twoPanedMode);
 192
 193         // Get a handle for the fragment manager.
 194         FragmentManager fragmentManager = getSupportFragmentManager();
 195
 196         // Display the fragments.  This must be done from `onCreateOptionsMenu()` instead of `onCreate()` because `populateDomainsListView()` needs `deleteMenuItem` to be inflated.
 197         if (restartAfterRotate && domainSettingsDisplayedBeforeRotate) {  // The device was rotated and domain settings were displayed previously.
 198             if (twoPanedMode) {  // The device is in two-paned mode.
 199                 // Reset `restartAfterRotate`.
 200                 restartAfterRotate = false;
 201
 202                 // Display `DomainsListFragment`.
 203                 DomainsListFragment domainsListFragment = new DomainsListFragment();
 204                 fragmentManager.beginTransaction().replace(R.id.domains_listview_fragment_container, domainsListFragment).commit();
 205                 fragmentManager.executePendingTransactions();
 206
 207                 // Populate the list of domains.  `domainSettingsDatabaseId` highlights the domain that was highlighted before the rotation.
 208                 populateDomainsListView(domainSettingsDatabaseIdBeforeRotate);
 209             } else {  // The device is in single-paned mode.
 210                 // Reset `restartAfterRotate`.
 211                 restartAfterRotate = false;
 212
 213                 // Store the current domain database ID.
 214                 currentDomainDatabaseId = domainSettingsDatabaseIdBeforeRotate;
 215
 216                 // Add `currentDomainDatabaseId` to `argumentsBundle`.
 217                 Bundle argumentsBundle = new Bundle();
 218                 argumentsBundle.putInt(DomainSettingsFragment.DATABASE_ID, currentDomainDatabaseId);
 219
 220                 // Add `argumentsBundle` to `domainSettingsFragment`.
 221                 DomainSettingsFragment domainSettingsFragment = new DomainSettingsFragment();
 222                 domainSettingsFragment.setArguments(argumentsBundle);
 223
 224                 // Show `deleteMenuItem`.
 225                 deleteMenuItem.setVisible(true);
 226
 227                 // Hide `add_domain_fab`.
 228                 addDomainFAB.hide();
 229
 230                 // Display `domainSettingsFragment`.
 231                 fragmentManager.beginTransaction().replace(R.id.domains_listview_fragment_container, domainSettingsFragment).commit();
 232             }
 233         } else {  // The device was not rotated or, if it was, domain settings were not displayed previously.
 234             if (goDirectlyToDatabaseId >=0) {  // Load the indicated domain settings.
 235                 // Store the current domain database ID.
 236                 currentDomainDatabaseId = goDirectlyToDatabaseId;
 237
 238                 if (twoPanedMode) {  // The device is in two-paned mode.
 239                     // Display `DomainsListFragment`.
 240                     DomainsListFragment domainsListFragment = new DomainsListFragment();
 241                     fragmentManager.beginTransaction().replace(R.id.domains_listview_fragment_container, domainsListFragment).commit();
 242                     fragmentManager.executePendingTransactions();
 243
 244                     // Populate the list of domains.  `domainSettingsDatabaseId` highlights the domain that was highlighted before the rotation.
 245                     populateDomainsListView(goDirectlyToDatabaseId);
 246                 } else {  // The device is in single-paned mode.
 247                     // Add the domain ID to be loaded to `argumentsBundle`.
 248                     Bundle argumentsBundle = new Bundle();
 249                     argumentsBundle.putInt(DomainSettingsFragment.DATABASE_ID, goDirectlyToDatabaseId);
 250
 251                     // Add `argumentsBundle` to `domainSettingsFragment`.
 252                     DomainSettingsFragment domainSettingsFragment = new DomainSettingsFragment();
 253                     domainSettingsFragment.setArguments(argumentsBundle);
 254
 255                     // Show `deleteMenuItem`.
 256                     deleteMenuItem.setVisible(true);
 257
 258                     // Hide `add_domain_fab`.
 259                     addDomainFAB.hide();
 260
 261                     // Display `domainSettingsFragment`.
 262                     fragmentManager.beginTransaction().replace(R.id.domains_listview_fragment_container, domainSettingsFragment).commit();
 263                 }
 264             } else {  // Highlight the first domain.
 265                 // Display `DomainsListFragment`.
 266                 DomainsListFragment domainsListFragment = new DomainsListFragment();
 267                 fragmentManager.beginTransaction().replace(R.id.domains_listview_fragment_container, domainsListFragment).commit();
 268                 fragmentManager.executePendingTransactions();
 269
 270                 // Populate the list of domains.  `-1` highlights the first domain.
 271                 populateDomainsListView(-1);
 272             }
 273         }
 274
 275         // Success!
 276         return true;
 277     }
 278
 279     @Override
 280     public boolean onOptionsItemSelected(MenuItem menuItem) {
 281         // Get the ID of the menu item that was selected.
 282         int menuItemID = menuItem.getItemId();
 283
 284         // Get a handle for the fragment manager.
 285         FragmentManager fragmentManager = getSupportFragmentManager();
 286
 287         switch (menuItemID) {
 288             case android.R.id.home:  // The home arrow is identified as `android.R.id.home`, not just `R.id.home`.
 289                 if (twoPanedMode) {  // The device is in two-paned mode.
 290                     // Save the current domain settings if the domain settings fragment is displayed.
 291                     if (findViewById(R.id.domain_settings_scrollview) != null) {
 292                         saveDomainSettings(coordinatorLayout, resources);
 293                     }
 294
 295                     // Dismiss the undo delete `SnackBar` if it is shown.
 296                     if (undoDeleteSnackbar != null && undoDeleteSnackbar.isShown()) {
 297                         // Set the close flag.
 298                         closeActivityAfterDismissingSnackbar = true;
 299
 300                         // Dismiss the snackbar.
 301                         undoDeleteSnackbar.dismiss();
 302                     } else {
 303                         // Go home.
 304                         NavUtils.navigateUpFromSameTask(this);
 305                     }
 306                 } else if (closeOnBack) {  // Go directly back to the main WebView activity because the domains activity was launched from the options menu.
 307                     // Save the current domain settings.
 308                     saveDomainSettings(coordinatorLayout, resources);
 309
 310                     // Go home.
 311                     NavUtils.navigateUpFromSameTask(this);
 312                 } else if (findViewById(R.id.domain_settings_scrollview) != null) {  // The device is in single-paned mode and the domain settings fragment is displayed.
 313                     // Save the current domain settings.
 314                     saveDomainSettings(coordinatorLayout, resources);
 315
 316                     // Display the domains list fragment.
 317                     DomainsListFragment domainsListFragment = new DomainsListFragment();
 318                     fragmentManager.beginTransaction().replace(R.id.domains_listview_fragment_container, domainsListFragment).commit();
 319                     fragmentManager.executePendingTransactions();
 320
 321                     // Populate the list of domains.  `-1` highlights the first domain if in two-paned mode.  It has no effect in single-paned mode.
 322                     populateDomainsListView(-1);
 323
 324                     // Show the add domain FAB.
 325                     addDomainFAB.show();
 326
 327                     // Hide the delete menu item.
 328                     deleteMenuItem.setVisible(false);
 329                 } else {  // The device is in single-paned mode and `DomainsListFragment` is displayed.
 330                     // Dismiss the undo delete `SnackBar` if it is shown.
 331                     if (undoDeleteSnackbar != null && undoDeleteSnackbar.isShown()) {
 332                         // Set the close flag.
 333                         closeActivityAfterDismissingSnackbar = true;
 334
 335                         // Dismiss the snackbar.
 336                         undoDeleteSnackbar.dismiss();
 337                     } else {
 338                         // Go home.
 339                         NavUtils.navigateUpFromSameTask(this);
 340                     }
 341                 }
 342                 break;
 343
 344             case R.id.delete_domain:
 345                 // Reset close-on-back, which otherwise can cause errors if the system attempts to save settings for a domain that no longer exists.
 346                 closeOnBack = false;
 347
 348                 // Store a copy of `currentDomainDatabaseId` because it could change while the `Snackbar` is displayed.
 349                 final int databaseIdToDelete = currentDomainDatabaseId;
 350
 351                 // Update the fragments and menu items.
 352                 if (twoPanedMode) {  // Two-paned mode.
 353                     // Store the deleted domain position, which is needed if `Undo` is selected in the `Snackbar`.
 354                     deletedDomainPosition = domainsListView.getCheckedItemPosition();
 355
 356                     // Disable the options `MenuItems`.
 357                     deleteMenuItem.setEnabled(false);
 358                     deleteMenuItem.setIcon(R.drawable.delete_blue);
 359
 360                     // Remove the domain settings fragment.
 361                     fragmentManager.beginTransaction().remove(Objects.requireNonNull(fragmentManager.findFragmentById(R.id.domain_settings_fragment_container))).commit();
 362                 } else {  // Single-paned mode.
 363                     // Display `DomainsListFragment`.
 364                     DomainsListFragment domainsListFragment = new DomainsListFragment();
 365                     fragmentManager.beginTransaction().replace(R.id.domains_listview_fragment_container, domainsListFragment).commit();
 366                     fragmentManager.executePendingTransactions();
 367
 368                     // Show the add domain FAB.
 369                     addDomainFAB.show();
 370
 371                     // Hide `deleteMenuItem`.
 372                     deleteMenuItem.setVisible(false);
 373                 }
 374
 375                 // Get a `Cursor` that does not show the domain to be deleted.
 376                 Cursor domainsPendingDeleteCursor = domainsDatabaseHelper.getDomainNameCursorOrderedByDomainExcept(databaseIdToDelete);
 377
 378                 // Setup `domainsPendingDeleteCursorAdapter` with `this` context.  `false` disables `autoRequery`.
 379                 CursorAdapter domainsPendingDeleteCursorAdapter = new CursorAdapter(this, domainsPendingDeleteCursor, false) {
 380                     @Override
 381                     public View newView(Context context, Cursor cursor, ViewGroup parent) {
 382                         // Inflate the individual item layout.  `false` does not attach it to the root.
 383                         return getLayoutInflater().inflate(R.layout.domain_name_linearlayout, parent, false);
 384                     }
 385
 386                     @Override
 387                     public void bindView(View view, Context context, Cursor cursor) {
 388                         // Set the domain name.
 389                         String domainNameString = cursor.getString(cursor.getColumnIndex(DomainsDatabaseHelper.DOMAIN_NAME));
 390                         TextView domainNameTextView = view.findViewById(R.id.domain_name_textview);
 391                         domainNameTextView.setText(domainNameString);
 392                     }
 393                 };
 394
 395                 // Update the handle for the current `domains_listview`.
 396                 domainsListView = findViewById(R.id.domains_listview);
 397
 398                 // Update the `ListView`.
 399                 domainsListView.setAdapter(domainsPendingDeleteCursorAdapter);
 400
 401                 // Get a handle for the activity.
 402                 Activity activity = this;
 403
 404                 // Display a `Snackbar`.
 405                 undoDeleteSnackbar = Snackbar.make(domainsListView, R.string.domain_deleted, Snackbar.LENGTH_LONG)
 406                         .setAction(R.string.undo, (View v) -> {
 407                             // Do nothing because everything will be handled by `onDismissed()` below.
 408                         })
 409                         .addCallback(new Snackbar.Callback() {
 410                             @SuppressLint("SwitchIntDef")  // Ignore the lint warning about not handling the other possible events as they are covered by `default:`.
 411                             @Override
 412                             public void onDismissed(Snackbar snackbar, int event) {
 413                                 switch (event) {
 414                                     // The user pushed the `Undo` button.
 415                                     case Snackbar.Callback.DISMISS_EVENT_ACTION:
 416                                         // Store `databaseId` in `argumentsBundle`.
 417                                         Bundle argumentsBundle = new Bundle();
 418                                         argumentsBundle.putInt(DomainSettingsFragment.DATABASE_ID, databaseIdToDelete);
 419
 420                                         // Add `argumentsBundle` to `domainSettingsFragment`.
 421                                         DomainSettingsFragment domainSettingsFragment = new DomainSettingsFragment();
 422                                         domainSettingsFragment.setArguments(argumentsBundle);
 423
 424                                         // Display the correct fragments.
 425                                         if (twoPanedMode) {  // The device in in two-paned mode.
 426                                             // Get a `Cursor` with the current contents of the domains database.
 427                                             Cursor undoDeleteDomainsCursor = domainsDatabaseHelper.getDomainNameCursorOrderedByDomain();
 428
 429                                             // Setup `domainsCursorAdapter` with `this` context.  `false` disables `autoRequery`.
 430                                             CursorAdapter undoDeleteDomainsCursorAdapter = new CursorAdapter(getApplicationContext(), undoDeleteDomainsCursor, false) {
 431                                                 @Override
 432                                                 public View newView(Context context, Cursor cursor, ViewGroup parent) {
 433                                                     // Inflate the individual item layout.  `false` does not attach it to the root.
 434                                                     return getLayoutInflater().inflate(R.layout.domain_name_linearlayout, parent, false);
 435                                                 }
 436
 437                                                 @Override
 438                                                 public void bindView(View view, Context context, Cursor cursor) {
 439                                                     // Set the domain name.
 440                                                     String domainNameString = cursor.getString(cursor.getColumnIndex(DomainsDatabaseHelper.DOMAIN_NAME));
 441                                                     TextView domainNameTextView = view.findViewById(R.id.domain_name_textview);
 442                                                     domainNameTextView.setText(domainNameString);
 443                                                 }
 444                                             };
 445
 446                                             // Update the `ListView`.
 447                                             domainsListView.setAdapter(undoDeleteDomainsCursorAdapter);
 448                                             // Select the previously deleted domain in `domainsListView`.
 449                                             domainsListView.setItemChecked(deletedDomainPosition, true);
 450
 451                                             // Display `domainSettingsFragment`.
 452                                             fragmentManager.beginTransaction().replace(R.id.domain_settings_fragment_container, domainSettingsFragment).commit();
 453
 454                                             // Enable the options `MenuItems`.
 455                                             deleteMenuItem.setEnabled(true);
 456                                             deleteMenuItem.setIcon(R.drawable.delete_light);
 457                                         } else {  // The device in in one-paned mode.
 458                                             // Display `domainSettingsFragment`.
 459                                             fragmentManager.beginTransaction().replace(R.id.domains_listview_fragment_container, domainSettingsFragment).commit();
 460
 461                                             // Hide the add domain FAB.
 462                                             addDomainFAB.hide();
 463
 464                                             // Show and enable `deleteMenuItem`.
 465                                             deleteMenuItem.setVisible(true);
 466
 467                                             // Display `domainSettingsFragment`.
 468                                             fragmentManager.beginTransaction().replace(R.id.domains_listview_fragment_container, domainSettingsFragment).commit();
 469                                         }
 470                                         break;
 471
 472                                     // The `Snackbar` was dismissed without the `Undo` button being pushed.
 473                                     default:
 474                                         // Delete the selected domain.
 475                                         domainsDatabaseHelper.deleteDomain(databaseIdToDelete);
 476
 477                                         // Enable the delete menu item if the system was waiting for a snackbar to be dismissed.
 478                                         if (dismissingSnackbar) {
 479                                             // Create a `Runnable` to enable the delete menu item.
 480                                             Runnable enableDeleteMenuItemRunnable = () -> {
 481                                                 // Enable `deleteMenuItem` according to the display mode.
 482                                                 if (twoPanedMode) {  // Two-paned mode.
 483                                                     // Enable `deleteMenuItem`.
 484                                                     deleteMenuItem.setEnabled(true);
 485
 486                                                     // Set the delete icon according to the theme.
 487                                                     if (MainWebViewActivity.darkTheme) {
 488                                                         deleteMenuItem.setIcon(R.drawable.delete_dark);
 489                                                     } else {
 490                                                         deleteMenuItem.setIcon(R.drawable.delete_light);
 491                                                     }
 492                                                 } else {  // Single-paned mode.
 493                                                     // Show `deleteMenuItem`.
 494                                                     deleteMenuItem.setVisible(true);
 495                                                 }
 496
 497                                                 // Reset `dismissingSnackbar`.
 498                                                 dismissingSnackbar = false;
 499                                             };
 500
 501                                             // Enable the delete menu icon after 100 milliseconds to make sure that the previous domain has been deleted from the database.
 502                                             Handler handler = new Handler();
 503                                             handler.postDelayed(enableDeleteMenuItemRunnable, 100);
 504                                         }
 505
 506                                         // Close the activity if back was pressed.
 507                                         if (closeActivityAfterDismissingSnackbar) {
 508                                             // Go home.
 509                                             NavUtils.navigateUpFromSameTask(activity);
 510                                         }
 511
 512                                         break;
 513                                 }
 514                             }
 515                         });
 516
 517                 // Show the Snackbar.
 518                 undoDeleteSnackbar.show();
 519                 break;
 520         }
 521
 522         // Consume the event.
 523         return true;
 524     }
 525
 526     @Override
 527     protected void onSaveInstanceState(Bundle outState) {
 528         // Store the current `DomainSettingsFragment` state in `outState`.
 529         if (findViewById(R.id.domain_settings_scrollview) != null) {  // `DomainSettingsFragment` is displayed.
 530             // Save any changes that have been made to the domain settings.
 531             saveDomainSettings(coordinatorLayout, resources);
 532
 533             // Store `DomainSettingsDisplayed`.
 534             outState.putBoolean("domainSettingsDisplayed", true);
 535             outState.putInt("domainSettingsDatabaseId", DomainSettingsFragment.databaseId);
 536         } else {  // `DomainSettingsFragment` is not displayed.
 537             outState.putBoolean("domainSettingsDisplayed", false);
 538             outState.putInt("domainSettingsDatabaseId", -1);
 539         }
 540
 541         super.onSaveInstanceState(outState);
 542     }
 543
 544     // Control what the navigation bar back button does.
 545     @Override
 546     public void onBackPressed() {
 547         // Get a handle for the fragment manager.
 548         FragmentManager fragmentManager = getSupportFragmentManager();
 549
 550         if (twoPanedMode) {  // The device is in two-paned mode.
 551             // Save the current domain settings if the domain settings fragment is displayed.
 552             if (findViewById(R.id.domain_settings_scrollview) != null) {
 553                 saveDomainSettings(coordinatorLayout, resources);
 554             }
 555
 556             // Dismiss the undo delete SnackBar if it is shown.
 557             if ((undoDeleteSnackbar != null) && undoDeleteSnackbar.isShown()) {
 558                 // Set the close flag.
 559                 closeActivityAfterDismissingSnackbar = true;
 560
 561                 // Dismiss the snackbar.
 562                 undoDeleteSnackbar.dismiss();
 563             } else {
 564                 // Pass `onBackPressed()` to the system.
 565                 super.onBackPressed();
 566             }
 567         } else if (closeOnBack) {  // Go directly back to the main WebView activity because the domains activity was launched from the options menu.
 568             // Save the current domain settings.
 569             saveDomainSettings(coordinatorLayout, resources);
 570
 571             // Pass `onBackPressed()` to the system.
 572             super.onBackPressed();
 573         } else if (findViewById(R.id.domain_settings_scrollview) != null) {  // The device is in single-paned mode and domain settings fragment is displayed.
 574             // Save the current domain settings.
 575             saveDomainSettings(coordinatorLayout, resources);
 576
 577             // Display the domains list fragment.
 578             DomainsListFragment domainsListFragment = new DomainsListFragment();
 579             fragmentManager.beginTransaction().replace(R.id.domains_listview_fragment_container, domainsListFragment).commit();
 580             fragmentManager.executePendingTransactions();
 581
 582             // Populate the list of domains.  `-1` highlights the first domain if in two-paned mode.  It has no effect in single-paned mode.
 583             populateDomainsListView(-1);
 584
 585             // Show the add domain FAB.
 586             addDomainFAB.show();
 587
 588             // Hide the delete menu item.
 589             deleteMenuItem.setVisible(false);
 590         } else {  // The device is in single-paned mode and the domain list fragment is displayed.
 591             // Dismiss the undo delete SnackBar if it is shown.
 592             if ((undoDeleteSnackbar != null) && undoDeleteSnackbar.isShown()) {
 593                 // Set the close flag.
 594                 closeActivityAfterDismissingSnackbar = true;
 595
 596                 // Dismiss the snackbar.
 597                 undoDeleteSnackbar.dismiss();
 598             } else {
 599                 // Pass `onBackPressed()` to the system.
 600                 super.onBackPressed();
 601             }
 602         }
 603     }
 604
 605     @Override
 606     public void onAddDomain(DialogFragment dialogFragment) {
 607         // Dismiss the undo delete snackbar if it is currently displayed.
 608         if ((undoDeleteSnackbar != null) && undoDeleteSnackbar.isShown()) {
 609             undoDeleteSnackbar.dismiss();
 610         }
 611
 612         // Get the new domain name String from the dialog fragment.
 613         EditText domainNameEditText = dialogFragment.getDialog().findViewById(R.id.domain_name_edittext);
 614         String domainNameString = domainNameEditText.getText().toString();
 615
 616         // Create the domain and store the database ID in `currentDomainDatabaseId`.
 617         currentDomainDatabaseId = domainsDatabaseHelper.addDomain(domainNameString);
 618
 619         // Display the newly created domain.
 620         if (twoPanedMode) {  // The device in in two-paned mode.
 621             populateDomainsListView(currentDomainDatabaseId);
 622         } else {  // The device is in single-paned mode.
 623             // Hide the add domain FAB.
 624             addDomainFAB.hide();
 625
 626             // Show and enable `deleteMenuItem`.
 627             DomainsActivity.deleteMenuItem.setVisible(true);
 628
 629             // Add the current domain database ID to the arguments bundle.
 630             Bundle argumentsBundle = new Bundle();
 631             argumentsBundle.putInt(DomainSettingsFragment.DATABASE_ID, currentDomainDatabaseId);
 632
 633             // Add and arguments bundle to the domain setting fragment.
 634             DomainSettingsFragment domainSettingsFragment = new DomainSettingsFragment();
 635             domainSettingsFragment.setArguments(argumentsBundle);
 636
 637             // Display the domain settings fragment.
 638             getSupportFragmentManager().beginTransaction().replace(R.id.domains_listview_fragment_container, domainSettingsFragment).commit();
 639         }
 640     }
 641
 642     public void saveDomainSettings(View view, Resources resources) {
 643         // Get handles for the domain settings.
 644         EditText domainNameEditText = view.findViewById(R.id.domain_settings_name_edittext);
 645         Switch javaScriptSwitch = view.findViewById(R.id.javascript_switch);
 646         Switch firstPartyCookiesSwitch = view.findViewById(R.id.first_party_cookies_switch);
 647         Switch thirdPartyCookiesSwitch = view.findViewById(R.id.third_party_cookies_switch);
 648         Switch domStorageSwitch = view.findViewById(R.id.dom_storage_switch);
 649         Switch formDataSwitch = view.findViewById(R.id.form_data_switch);  // Form data can be removed once the minimum API >= 26.
 650         Switch easyListSwitch = view.findViewById(R.id.easylist_switch);
 651         Switch easyPrivacySwitch = view.findViewById(R.id.easyprivacy_switch);
 652         Switch fanboysAnnoyanceSwitch = view.findViewById(R.id.fanboys_annoyance_list_switch);
 653         Switch fanboysSocialBlockingSwitch = view.findViewById(R.id.fanboys_social_blocking_list_switch);
 654         Switch ultraPrivacySwitch = view.findViewById(R.id.ultraprivacy_switch);
 655         Switch blockAllThirdPartyRequestsSwitch = view.findViewById(R.id.block_all_third_party_requests_switch);
 656         Spinner userAgentSpinner = view.findViewById(R.id.user_agent_spinner);
 657         EditText customUserAgentEditText = view.findViewById(R.id.custom_user_agent_edittext);
 658         Spinner fontSizeSpinner = view.findViewById(R.id.font_size_spinner);
 659         Spinner swipeToRefreshSpinner = view.findViewById(R.id.swipe_to_refresh_spinner);
 660         Spinner displayWebpageImagesSpinner = view.findViewById(R.id.display_webpage_images_spinner);
 661         Spinner nightModeSpinner = view.findViewById(R.id.night_mode_spinner);
 662         Switch pinnedSslCertificateSwitch = view.findViewById(R.id.pinned_ssl_certificate_switch);
 663         RadioButton currentWebsiteCertificateRadioButton = view.findViewById(R.id.current_website_certificate_radiobutton);
 664         Switch pinnedIpAddressesSwitch = view.findViewById(R.id.pinned_ip_addresses_switch);
 665         RadioButton currentIpAddressesRadioButton = view.findViewById(R.id.current_ip_addresses_radiobutton);
 666         TextView currentIpAddressesTextView = view.findViewById(R.id.current_ip_addresses_textview);
 667
 668         // Extract the data for the domain settings.
 669         String domainNameString = domainNameEditText.getText().toString();
 670         boolean javaScriptEnabled = javaScriptSwitch.isChecked();
 671         boolean firstPartyCookiesEnabled = firstPartyCookiesSwitch.isChecked();
 672         boolean thirdPartyCookiesEnabled = thirdPartyCookiesSwitch.isChecked();
 673         boolean domStorageEnabled  = domStorageSwitch.isChecked();
 674         boolean formDataEnabled = formDataSwitch.isChecked();  // Form data can be removed once the minimum API >= 26.
 675         boolean easyListEnabled = easyListSwitch.isChecked();
 676         boolean easyPrivacyEnabled = easyPrivacySwitch.isChecked();
 677         boolean fanboysAnnoyanceEnabled = fanboysAnnoyanceSwitch.isChecked();
 678         boolean fanboysSocialBlockingEnabled = fanboysSocialBlockingSwitch.isChecked();
 679         boolean ultraPrivacyEnabled = ultraPrivacySwitch.isChecked();
 680         boolean blockAllThirdPartyRequests = blockAllThirdPartyRequestsSwitch.isChecked();
 681         int userAgentPosition = userAgentSpinner.getSelectedItemPosition();
 682         int fontSizePosition = fontSizeSpinner.getSelectedItemPosition();
 683         int swipeToRefreshInt = swipeToRefreshSpinner.getSelectedItemPosition();
 684         int displayWebpageImagesInt = displayWebpageImagesSpinner.getSelectedItemPosition();
 685         int nightModeInt = nightModeSpinner.getSelectedItemPosition();
 686         boolean pinnedSslCertificate = pinnedSslCertificateSwitch.isChecked();
 687         boolean pinnedIpAddress = pinnedIpAddressesSwitch.isChecked();
 688
 689         // Initialize the user agent name string.
 690         String userAgentName;
 691
 692         // Set the user agent name.
 693         switch (userAgentPosition) {
 694             case MainWebViewActivity.DOMAINS_SYSTEM_DEFAULT_USER_AGENT:
 695                 // Set the user agent name to be `System default user agent`.
 696                 userAgentName = resources.getString(R.string.system_default_user_agent);
 697                 break;
 698
 699             case MainWebViewActivity.DOMAINS_CUSTOM_USER_AGENT:
 700                 // Set the user agent name to be the custom user agent.
 701                 userAgentName = customUserAgentEditText.getText().toString();
 702                 break;
 703
 704             default:
 705                 // Get the array of user agent names.
 706                 String[] userAgentNameArray = resources.getStringArray(R.array.user_agent_names);
 707
 708                 // Set the user agent name from the array.  The domain spinner has one more entry than the name array, so the position must be decremented.
 709                 userAgentName = userAgentNameArray[userAgentPosition - 1];
 710         }
 711
 712         // Get the font size integer.
 713         int fontSizeInt = Integer.parseInt(resources.getStringArray(R.array.domain_settings_font_size_entry_values)[fontSizePosition]);
 714
 715         // Save the domain settings.
 716         domainsDatabaseHelper.updateDomain(DomainsActivity.currentDomainDatabaseId, domainNameString, javaScriptEnabled, firstPartyCookiesEnabled, thirdPartyCookiesEnabled,
 717                     domStorageEnabled, formDataEnabled, easyListEnabled, easyPrivacyEnabled, fanboysAnnoyanceEnabled, fanboysSocialBlockingEnabled, ultraPrivacyEnabled, blockAllThirdPartyRequests,
 718                     userAgentName, fontSizeInt, swipeToRefreshInt, nightModeInt, displayWebpageImagesInt, pinnedSslCertificate, pinnedIpAddress);
 719
 720         // Update the pinned SSL certificate if a new one is checked.
 721         if (currentWebsiteCertificateRadioButton.isChecked()) {
 722             // Get the current website SSL certificate.
 723             SslCertificate currentWebsiteSslCertificate = MainWebViewActivity.sslCertificate;
 724
 725             // Store the values from the SSL certificate.
 726             String issuedToCommonName = currentWebsiteSslCertificate.getIssuedTo().getCName();
 727             String issuedToOrganization = currentWebsiteSslCertificate.getIssuedTo().getOName();
 728             String issuedToOrganizationalUnit = currentWebsiteSslCertificate.getIssuedTo().getUName();
 729             String issuedByCommonName = currentWebsiteSslCertificate.getIssuedBy().getCName();
 730             String issuedByOrganization = currentWebsiteSslCertificate.getIssuedBy().getOName();
 731             String issuedByOrganizationalUnit = currentWebsiteSslCertificate.getIssuedBy().getUName();
 732             long startDateLong = currentWebsiteSslCertificate.getValidNotBeforeDate().getTime();
 733             long endDateLong = currentWebsiteSslCertificate.getValidNotAfterDate().getTime();
 734
 735             // Update the database.
 736             domainsDatabaseHelper.updatePinnedSslCertificate(currentDomainDatabaseId, issuedToCommonName, issuedToOrganization, issuedToOrganizationalUnit, issuedByCommonName, issuedByOrganization,
 737                     issuedByOrganizationalUnit, startDateLong, endDateLong);
 738         }
 739
 740         // Update the pinned IP addresses if new ones are checked.
 741         if (currentIpAddressesRadioButton.isChecked()) {
 742             // Get the current IP addresses.
 743             String currentIpAddresses = currentIpAddressesTextView.getText().toString();
 744
 745             // Update the database.
 746             domainsDatabaseHelper.updatePinnedIpAddresses(currentDomainDatabaseId, currentIpAddresses);
 747         }
 748     }
 749
 750     private void populateDomainsListView(final int highlightedDomainDatabaseId) {
 751         // get a handle for the current `domains_listview`.
 752         domainsListView = findViewById(R.id.domains_listview);
 753
 754         // Get a `Cursor` with the current contents of the domains database.
 755         Cursor domainsCursor = domainsDatabaseHelper.getDomainNameCursorOrderedByDomain();
 756
 757         // Setup `domainsCursorAdapter` with `this` context.  `false` disables `autoRequery`.
 758         CursorAdapter domainsCursorAdapter = new CursorAdapter(getApplicationContext(), domainsCursor, false) {
 759             @Override
 760             public View newView(Context context, Cursor cursor, ViewGroup parent) {
 761                 // Inflate the individual item layout.  `false` does not attach it to the root.
 762                 return getLayoutInflater().inflate(R.layout.domain_name_linearlayout, parent, false);
 763             }
 764
 765             @Override
 766             public void bindView(View view, Context context, Cursor cursor) {
 767                 // Set the domain name.
 768                 String domainNameString = cursor.getString(cursor.getColumnIndex(DomainsDatabaseHelper.DOMAIN_NAME));
 769                 TextView domainNameTextView = view.findViewById(R.id.domain_name_textview);
 770                 domainNameTextView.setText(domainNameString);
 771             }
 772         };
 773
 774         // Update the `ListView`.
 775         domainsListView.setAdapter(domainsCursorAdapter);
 776
 777         // Display the domain settings in the second pane if operating in two pane mode and the database contains at least one domain.
 778         if (DomainsActivity.twoPanedMode && (domainsCursor.getCount() > 0)) {  // Two-paned mode is enabled and there is at least one domain.
 779             // Initialize `highlightedDomainPosition`.
 780             int highlightedDomainPosition = 0;
 781
 782             // Get the cursor position for the highlighted domain.
 783             for (int i = 0; i < domainsCursor.getCount(); i++) {
 784                 // Move to position `i` in the cursor.
 785                 domainsCursor.moveToPosition(i);
 786
 787                 // Get the database ID for this position.
 788                 int currentDatabaseId = domainsCursor.getInt(domainsCursor.getColumnIndex(DomainsDatabaseHelper._ID));
 789
 790                 // Set `highlightedDomainPosition` if the database ID for this matches `highlightedDomainDatabaseId`.
 791                 if (highlightedDomainDatabaseId == currentDatabaseId) {
 792                     highlightedDomainPosition = i;
 793                 }
 794             }
 795
 796             // Select the highlighted domain.
 797             domainsListView.setItemChecked(highlightedDomainPosition, true);
 798
 799             // Get the database ID for the highlighted domain.
 800             domainsCursor.moveToPosition(highlightedDomainPosition);
 801             currentDomainDatabaseId = domainsCursor.getInt(domainsCursor.getColumnIndex(DomainsDatabaseHelper._ID));
 802
 803             // Store the database ID in the arguments bundle.
 804             Bundle argumentsBundle = new Bundle();
 805             argumentsBundle.putInt(DomainSettingsFragment.DATABASE_ID, currentDomainDatabaseId);
 806
 807             // Add and arguments bundle to the domain settings fragment.
 808             DomainSettingsFragment domainSettingsFragment = new DomainSettingsFragment();
 809             domainSettingsFragment.setArguments(argumentsBundle);
 810
 811             // Display the domain settings fragment.
 812             getSupportFragmentManager().beginTransaction().replace(R.id.domain_settings_fragment_container, domainSettingsFragment).commit();
 813
 814             // Enable the delete options menu items.
 815             deleteMenuItem.setEnabled(true);
 816
 817             // Set the delete icon according to the theme.
 818             if (MainWebViewActivity.darkTheme) {
 819                 deleteMenuItem.setIcon(R.drawable.delete_dark);
 820             } else {
 821                 deleteMenuItem.setIcon(R.drawable.delete_light);
 822             }
 823         } else if (twoPanedMode) {  // Two-paned mode is enabled but there are no domains.
 824             // Disable the options `MenuItems`.
 825             deleteMenuItem.setEnabled(false);
 826             deleteMenuItem.setIcon(R.drawable.delete_blue);
 827         }
 828     }
 829
 830     @Override
 831     public void dismissSnackbar() {
 832         // Dismiss the undo delete snackbar if it is shown.
 833         if (undoDeleteSnackbar != null && undoDeleteSnackbar.isShown()) {
 834             // Dismiss the snackbar.
 835             undoDeleteSnackbar.dismiss();
 836         }
 837     }
 838
 839     @Override
 840     public void onDestroy() {
 841         // Close the domains database helper.
 842         domainsDatabaseHelper.close();
 843
 844         // Run the default commands.
 845         super.onDestroy();
 846     }
 847 }