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

   1 /*
   2  * Copyright © 2016-2017 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.app.Activity;
  23 import android.content.Context;
  24 import android.content.Intent;
  25 import android.database.Cursor;
  26 import android.graphics.Bitmap;
  27 import android.graphics.BitmapFactory;
  28 import android.graphics.Typeface;
  29 import android.graphics.drawable.BitmapDrawable;
  30 import android.graphics.drawable.Drawable;
  31 import android.os.Bundle;
  32 import android.support.design.widget.FloatingActionButton;
  33 import android.support.design.widget.Snackbar;
  34 import android.support.v4.app.NavUtils;
  35 import android.support.v7.app.ActionBar;
  36 import android.support.v7.app.AppCompatActivity;
  37 import android.support.v7.app.AppCompatDialogFragment;
  38 import android.support.v7.widget.Toolbar;
  39 import android.util.SparseBooleanArray;
  40 import android.view.ActionMode;
  41 import android.view.Menu;
  42 import android.view.MenuItem;
  43 import android.view.View;
  44 import android.view.ViewGroup;
  45 import android.widget.AbsListView;
  46 import android.widget.AdapterView;
  47 import android.widget.CursorAdapter;
  48 import android.widget.EditText;
  49 import android.widget.ImageView;
  50 import android.widget.ListView;
  51 import android.widget.RadioButton;
  52 import android.widget.TextView;
  53
  54 import com.stoutner.privacybrowser.dialogs.CreateBookmarkDialog;
  55 import com.stoutner.privacybrowser.dialogs.CreateBookmarkFolderDialog;
  56 import com.stoutner.privacybrowser.dialogs.EditBookmarkDialog;
  57 import com.stoutner.privacybrowser.dialogs.EditBookmarkFolderDialog;
  58 import com.stoutner.privacybrowser.dialogs.MoveToFolderDialog;
  59 import com.stoutner.privacybrowser.R;
  60 import com.stoutner.privacybrowser.helpers.BookmarksDatabaseHelper;
  61
  62 import java.io.ByteArrayOutputStream;
  63
  64 public class BookmarksActivity extends AppCompatActivity implements CreateBookmarkDialog.CreateBookmarkListener, CreateBookmarkFolderDialog.CreateBookmarkFolderListener, EditBookmarkDialog.EditBookmarkListener, EditBookmarkFolderDialog.EditBookmarkFolderListener,
  65         MoveToFolderDialog.MoveToFolderListener {
  66
  67     // `bookmarksDatabaseHelper` is public static so it can be accessed from `CreateBookmarkFolderDialog`, `EditBookmarkDialog`, `EditBookmarkFolderDialog` and `MoveToFolderDialog`.  It is also used in `onCreate()`,
  68     // `onCreateBookmarkCreate()`, `updateBookmarksListView()`, and `updateBookmarksListViewExcept()`.
  69     public static BookmarksDatabaseHelper bookmarksDatabaseHelper;
  70
  71     // `currentFolder` is public static so it can be accessed from `MoveToFolderDialog`.
  72     // It is used in `onCreate`, `onOptionsItemSelected()`, `onCreateBookmarkCreate`, `onCreateBookmarkFolderCreate`, and `onEditBookmarkSave`.
  73     public static String currentFolder;
  74
  75     // `checkedItemIds` is public static so it can be accessed from `EditBookmarkDialog`, `EditBookmarkFolderDialog`, and `MoveToFolderDialog`.
  76     // It is also used in `onActionItemClicked`.
  77     public static long[] checkedItemIds;
  78
  79
  80     // `bookmarksListView` is used in `onCreate()`, `updateBookmarksListView()`, and `updateBookmarksListViewExcept()`.
  81     private ListView bookmarksListView;
  82
  83     // `contextualActionMode` is used in `onCreate()` and `onEditBookmarkSave()`.
  84     private ActionMode contextualActionMode;
  85
  86     // `selectedBookmarkPosition` is used in `onCreate()` and `onEditBookmarkSave()`.
  87     private int selectedBookmarkPosition;
  88
  89     // `appBar` is used in `onCreate()` and `updateBookmarksListView()`.
  90     private ActionBar appBar;
  91
  92     // `bookmarksCursor` is used in `onCreate()`, `updateBookmarksListView()`, and `updateBookmarksListViewExcept()`.
  93     private Cursor bookmarksCursor;
  94
  95     // `oldFolderName` is used in `onCreate()` and `onEditBookmarkFolderSave()`.
  96     private String oldFolderNameString;
  97
  98     @Override
  99     protected void onCreate(Bundle savedInstanceState) {
 100         // Set the activity theme.
 101         if (MainWebViewActivity.darkTheme) {
 102             setTheme(R.style.PrivacyBrowserDark_SecondaryActivity);
 103         } else {
 104             setTheme(R.style.PrivacyBrowserLight_SecondaryActivity);
 105         }
 106
 107         // Run the default commands.
 108         super.onCreate(savedInstanceState);
 109
 110         // Set the content view.
 111         setContentView(R.layout.bookmarks_coordinatorlayout);
 112
 113         // Use the `SupportActionBar` from `android.support.v7.app.ActionBar` until the minimum API is >= 21.
 114         final Toolbar bookmarksAppBar = (Toolbar) findViewById(R.id.bookmarks_toolbar);
 115         setSupportActionBar(bookmarksAppBar);
 116
 117         // Display the home arrow on `SupportActionBar`.
 118         appBar = getSupportActionBar();
 119         assert appBar != null;// This assert removes the incorrect warning in Android Studio on the following line that `appBar` might be null.
 120         appBar.setDisplayHomeAsUpEnabled(true);
 121
 122
 123         // Initialize the database helper and the `ListView`.  `this` specifies the context.  The two `nulls` do not specify the database name or a `CursorFactory`.
 124         // The `0` specifies a database version, but that is ignored and set instead using a constant in `BookmarksDatabaseHelper`.
 125         bookmarksDatabaseHelper = new BookmarksDatabaseHelper(this, null, null, 0);
 126         bookmarksListView = (ListView) findViewById(R.id.bookmarks_listview);
 127
 128         // Set currentFolder to the home folder, which is `""` in the database.
 129         currentFolder = "";
 130
 131         // Display the bookmarks in the ListView.
 132         updateBookmarksListView(currentFolder);
 133
 134         // Set a listener so that tapping a list item loads the URL.  We need to store the activity in a variable so that we can return to the parent activity after loading the URL.
 135         final Activity bookmarksActivity = this;
 136         bookmarksListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
 137             @Override
 138             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
 139                 // Convert the id from long to int to match the format of the bookmarks database.
 140                 int databaseID = (int) id;
 141
 142                 // Get the bookmark `Cursor` for this ID and move it to the first row.
 143                 Cursor bookmarkCursor = bookmarksDatabaseHelper.getBookmarkCursor(databaseID);
 144                 bookmarkCursor.moveToFirst();
 145
 146                 // If the bookmark is a folder load its contents into the ListView.
 147                 if (bookmarkCursor.getInt(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1) {
 148                     // Update `currentFolder`.
 149                     currentFolder = bookmarkCursor.getString(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 150
 151                     // Reload the ListView with `currentFolder`.
 152                     updateBookmarksListView(currentFolder);
 153                 } else {  // Load the URL into `mainWebView`.
 154                     // Get the bookmark URL and assign it to formattedUrlString.  `mainWebView` will automatically reload when `BookmarksActivity` closes.
 155                     MainWebViewActivity.formattedUrlString = bookmarkCursor.getString(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_URL));
 156
 157                     NavUtils.navigateUpFromSameTask(bookmarksActivity);
 158                 }
 159
 160                 // Close the `Cursor`.
 161                 bookmarkCursor.close();
 162             }
 163         });
 164
 165         // `MultiChoiceModeListener` handles long clicks.
 166         bookmarksListView.setMultiChoiceModeListener(new AbsListView.MultiChoiceModeListener() {
 167             // `moveBookmarkUpMenuItem` is used in `onCreateActionMode()` and `onItemCheckedStateChanged`.
 168             MenuItem moveBookmarkUpMenuItem;
 169
 170             // `moveBookmarkDownMenuItem` is used in `onCreateActionMode()` and `onItemCheckedStateChanged`.
 171             MenuItem moveBookmarkDownMenuItem;
 172
 173             // `editBookmarkMenuItem` is used in `onCreateActionMode()` and `onItemCheckedStateChanged`.
 174             MenuItem editBookmarkMenuItem;
 175
 176             // `selectAllBookmarks` is used in `onCreateActionMode()` and `onItemCheckedStateChanges`.
 177             MenuItem selectAllBookmarksMenuItem;
 178
 179             @Override
 180             public boolean onCreateActionMode(ActionMode mode, Menu menu) {
 181                 // Inflate the menu for the contextual app bar and set the title.
 182                 getMenuInflater().inflate(R.menu.bookmarks_context_menu, menu);
 183
 184                 // Set the title.
 185                 if (currentFolder.isEmpty()) {
 186                     // Use `R.string.bookmarks` if we are in the home folder.
 187                     mode.setTitle(R.string.bookmarks);
 188                 } else {  // Use the current folder name as the title.
 189                     mode.setTitle(currentFolder);
 190                 }
 191
 192                 // Get a handle for MenuItems we need to selectively disable.
 193                 moveBookmarkUpMenuItem = menu.findItem(R.id.move_bookmark_up);
 194                 moveBookmarkDownMenuItem = menu.findItem(R.id.move_bookmark_down);
 195                 editBookmarkMenuItem = menu.findItem(R.id.edit_bookmark);
 196                 selectAllBookmarksMenuItem = menu.findItem(R.id.context_menu_select_all_bookmarks);
 197
 198                 // Store `contextualActionMode` so we can close it programatically.
 199                 contextualActionMode = mode;
 200
 201                 return true;
 202             }
 203
 204             @Override
 205             public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
 206                 // Get a handle for the move to folder menu item.
 207                 MenuItem moveToFolderMenuItem = menu.findItem(R.id.move_to_folder);
 208
 209                 // Get a `Cursor` with all of the folders.
 210                 Cursor folderCursor = bookmarksDatabaseHelper.getAllFoldersCursor();
 211
 212                 // Enable the move to folder menu item if at least one folder exists.
 213                 moveToFolderMenuItem.setVisible(folderCursor.getCount() > 0);
 214
 215                 // `return true` indicates that the menu has been updated.
 216                 return true;
 217             }
 218
 219             @Override
 220             public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
 221                 // Get an array of the selected bookmarks.
 222                 long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
 223
 224                 // Calculate the number of selected bookmarks.
 225                 int numberOfSelectedBookmarks = selectedBookmarksLongArray.length;
 226
 227                 // Adjust the `mode` and the menu for the number of selected bookmarks.
 228                 if (numberOfSelectedBookmarks == 0) {
 229                     mode.finish();
 230                 } else if (numberOfSelectedBookmarks == 1) {
 231                     // List the number of selected bookmarks in the subtitle.
 232                     mode.setSubtitle(getString(R.string.one_selected));
 233
 234                     // Show the `Move Up`, `Move Down`, and  `Edit` options.
 235                     moveBookmarkUpMenuItem.setVisible(true);
 236                     moveBookmarkDownMenuItem.setVisible(true);
 237                     editBookmarkMenuItem.setVisible(true);
 238
 239                     // Get the database IDs for the bookmarks.
 240                     int selectedBookmarkDatabaseId = (int) selectedBookmarksLongArray[0];
 241                     int firstBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(0);
 242                     // bookmarksListView is 0 indexed.
 243                     int lastBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(bookmarksListView.getCount() - 1);
 244
 245                     // Disable `moveBookmarkUpMenuItem` if the selected bookmark is at the top of the ListView.
 246                     if (selectedBookmarkDatabaseId == firstBookmarkDatabaseId) {
 247                         moveBookmarkUpMenuItem.setEnabled(false);
 248                         moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_disabled);
 249                     } else {  // Otherwise enable `moveBookmarkUpMenuItem`.
 250                         moveBookmarkUpMenuItem.setEnabled(true);
 251
 252                         // Set the icon according to the theme.
 253                         if (MainWebViewActivity.darkTheme) {
 254                             moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_enabled_dark);
 255                         } else {
 256                             moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_enabled_light);
 257                         }
 258                     }
 259
 260                     // Disable `moveBookmarkDownMenuItem` if the selected bookmark is at the bottom of the ListView.
 261                     if (selectedBookmarkDatabaseId == lastBookmarkDatabaseId) {
 262                         moveBookmarkDownMenuItem.setEnabled(false);
 263                         moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_disabled);
 264                     } else {  // Otherwise enable `moveBookmarkDownMenuItem`.
 265                         moveBookmarkDownMenuItem.setEnabled(true);
 266
 267                         // Set the icon according to the theme.
 268                         if (MainWebViewActivity.darkTheme) {
 269                             moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_enabled_dark);
 270                         } else {
 271                             moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_enabled_light);
 272                         }
 273                     }
 274                 } else {  // More than one bookmark is selected.
 275                     // List the number of selected bookmarks in the subtitle.
 276                     mode.setSubtitle(numberOfSelectedBookmarks + " " + getString(R.string.selected));
 277
 278                     // Hide non-applicable `MenuItems`.
 279                     moveBookmarkUpMenuItem.setVisible(false);
 280                     moveBookmarkDownMenuItem.setVisible(false);
 281                     editBookmarkMenuItem.setVisible(false);
 282                 }
 283
 284                 // Do not show `Select All` if all the bookmarks are already checked.
 285                 if (bookmarksListView.getCheckedItemIds().length == bookmarksListView.getCount()) {
 286                     selectAllBookmarksMenuItem.setVisible(false);
 287                 } else {
 288                     selectAllBookmarksMenuItem.setVisible(true);
 289                 }
 290             }
 291
 292             @Override
 293             public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
 294                 // Get the menu item ID.
 295                 int menuItemId = item.getItemId();
 296
 297                 // Instantiate the common variables.
 298                 int numberOfBookmarks;
 299                 int selectedBookmarkNewPosition;
 300                 SparseBooleanArray bookmarkPositionSparseBooleanArray;
 301
 302                 switch (menuItemId) {
 303                     case R.id.move_bookmark_up:
 304                         // Get the array of checked bookmarks.
 305                         bookmarkPositionSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
 306
 307                         // Store the position of the selected bookmark.
 308                         selectedBookmarkPosition = bookmarkPositionSparseBooleanArray.keyAt(0);
 309
 310                         // Initialize `selectedBookmarkNewPosition`.
 311                         selectedBookmarkNewPosition = 0;
 312
 313                         // Iterate through the bookmarks.
 314                         for (int i = 0; i < bookmarksListView.getCount(); i++) {
 315                             // Get the database ID for the current bookmark.
 316                             int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 317
 318                             // Update the display order for the current bookmark.
 319                             if (i == selectedBookmarkPosition) {  // The current bookmark is the selected bookmark.
 320                                 // Move the current bookmark up one.
 321                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i - 1);
 322                                 selectedBookmarkNewPosition = i - 1;
 323                             } else if ((i + 1) == selectedBookmarkPosition){  // The current bookmark is immediately above the selected bookmark.
 324                                 // Move the current bookmark down one.
 325                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i + 1);
 326                             } else {  // The current bookmark is not changing positions.
 327                                 // Move `bookmarksCursor` to the current bookmark position.
 328                                 bookmarksCursor.moveToPosition(i);
 329
 330                                 // Update the display order only if it is not correct in the database.
 331                                 if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
 332                                     bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
 333                                 }
 334                             }
 335                         }
 336
 337                         // Refresh the ListView.
 338                         updateBookmarksListView(currentFolder);
 339
 340                         // Select the previously selected bookmark in the new location.
 341                         bookmarksListView.setItemChecked(selectedBookmarkNewPosition, true);
 342
 343                         // Scroll `bookmarksListView` to five items above `selectedBookmarkNewPosition`.
 344                         bookmarksListView.setSelection(selectedBookmarkNewPosition - 5);
 345
 346                         break;
 347
 348                     case R.id.move_bookmark_down:
 349                         // Get the array of checked bookmarks.
 350                         bookmarkPositionSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
 351
 352                         // Store the position of the selected bookmark.
 353                         selectedBookmarkPosition = bookmarkPositionSparseBooleanArray.keyAt(0);
 354
 355                         // Initialize `selectedBookmarkNewPosition`.
 356                         selectedBookmarkNewPosition = 0;
 357
 358                         // Iterate through the bookmarks.
 359                         for (int i = 0; i <bookmarksListView.getCount(); i++) {
 360                             // Get the database ID for the current bookmark.
 361                             int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 362
 363                             // Update the display order for the current bookmark.
 364                             if (i == selectedBookmarkPosition) {  // The current bookmark is the selected bookmark.
 365                                 // Move the current bookmark down one.
 366                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i + 1);
 367                                 selectedBookmarkNewPosition = i + 1;
 368                             } else if ((i - 1) == selectedBookmarkPosition) {  // The current bookmark is immediately below the selected bookmark.
 369                                 // Move the bookmark below the selected bookmark up one.
 370                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i - 1);
 371                             } else {  // The current bookmark is not changing positions.
 372                                 // Move `bookmarksCursor` to the current bookmark position.
 373                                 bookmarksCursor.moveToPosition(i);
 374
 375                                 // Update the display order only if it is not correct in the database.
 376                                 if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
 377                                     bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
 378                                 }
 379                             }
 380                         }
 381
 382                         // Refresh the ListView.
 383                         updateBookmarksListView(currentFolder);
 384
 385                         // Select the previously selected bookmark in the new location.
 386                         bookmarksListView.setItemChecked(selectedBookmarkNewPosition, true);
 387
 388                         // Scroll `bookmarksListView` to five items above `selectedBookmarkNewPosition`.
 389                         bookmarksListView.setSelection(selectedBookmarkNewPosition - 5);
 390                         break;
 391
 392                     case R.id.move_to_folder:
 393                         // Store `checkedItemIds` for use by the `AlertDialog`.
 394                         checkedItemIds = bookmarksListView.getCheckedItemIds();
 395
 396                         // Show the `MoveToFolderDialog` `AlertDialog` and name the instance `@string/move_to_folder
 397                         AppCompatDialogFragment moveToFolderDialog = new MoveToFolderDialog();
 398                         moveToFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.move_to_folder));
 399                         break;
 400
 401                     case R.id.edit_bookmark:
 402                         // Get the array of checked bookmarks.
 403                         bookmarkPositionSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
 404
 405                         // Store the position of the selected bookmark.
 406                         selectedBookmarkPosition = bookmarkPositionSparseBooleanArray.keyAt(0);
 407
 408                         // Move to the selected database ID and find out if it is a folder.
 409                         bookmarksCursor.moveToPosition(selectedBookmarkPosition);
 410                         boolean isFolder = (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1);
 411
 412                         // Store `checkedItemIds` for use by the `AlertDialog`.
 413                         checkedItemIds = bookmarksListView.getCheckedItemIds();
 414
 415                         if (isFolder) {
 416                             // Save the current folder name.
 417                             oldFolderNameString = bookmarksCursor.getString(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 418
 419                             // Show the `EditBookmarkFolderDialog` `AlertDialog` and name the instance `@string/edit_folder`.
 420                             AppCompatDialogFragment editFolderDialog = new EditBookmarkFolderDialog();
 421                             editFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_folder));
 422                         } else {
 423                             // Show the `EditBookmarkDialog` `AlertDialog` and name the instance `@string/edit_bookmark`.
 424                             AppCompatDialogFragment editBookmarkDialog = new EditBookmarkDialog();
 425                             editBookmarkDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_bookmark));
 426                         }
 427                         break;
 428
 429                     case R.id.delete_bookmark:
 430                         // Get an array of the selected rows.
 431                         final long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
 432
 433                         // Get the array of checked bookmarks.
 434                         bookmarkPositionSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
 435
 436                         // Store the position of the first selected bookmark.
 437                         selectedBookmarkPosition = bookmarkPositionSparseBooleanArray.keyAt(0);
 438
 439                         updateBookmarksListViewExcept(selectedBookmarksLongArray, currentFolder);
 440
 441                         // Scroll to where the first deleted bookmark was located.
 442                         bookmarksListView.setSelection(selectedBookmarkPosition - 5);
 443
 444                         // Create `snackbarMessage`.
 445                         String snackbarMessage;
 446
 447                         // Determine how many items are in the array and prepare an appropriate Snackbar message.
 448                         if (selectedBookmarksLongArray.length == 1) {
 449                             snackbarMessage = getString(R.string.one_bookmark_deleted);
 450                         } else {
 451                             snackbarMessage = selectedBookmarksLongArray.length + " " + getString(R.string.bookmarks_deleted);
 452                         }
 453
 454                         // Show a SnackBar.
 455                         Snackbar.make(findViewById(R.id.bookmarks_coordinatorlayout), snackbarMessage, Snackbar.LENGTH_LONG)
 456                                 .setAction(R.string.undo, new View.OnClickListener() {
 457                                     @Override
 458                                     public void onClick(View view) {
 459                                         // Do nothing because everything will be handled by `onDismissed()` below.
 460                                     }
 461                                 })
 462                                 .addCallback(new Snackbar.Callback() {
 463                                     @Override
 464                                     public void onDismissed(Snackbar snackbar, int event) {
 465                                         switch (event) {
 466                                             // The user pushed the `Undo` button.
 467                                             case Snackbar.Callback.DISMISS_EVENT_ACTION:
 468                                                 // Refresh the ListView to show the rows again.
 469                                                 updateBookmarksListView(currentFolder);
 470
 471                                                 // Scroll to where the first deleted bookmark was located.
 472                                                 bookmarksListView.setSelection(selectedBookmarkPosition - 5);
 473                                                 break;
 474
 475                                             // The `Snackbar` was dismissed without the `Undo` button being pushed.
 476                                             default:
 477                                                 // Delete each selected row.
 478                                                 for (long databaseIdLong : selectedBookmarksLongArray) {
 479                                                     // Convert `databaseIdLong` to an int.
 480                                                     int databaseIdInt = (int) databaseIdLong;
 481
 482                                                     if (bookmarksDatabaseHelper.isFolder(databaseIdInt)) {
 483                                                         deleteBookmarkFolderContents(databaseIdInt);
 484                                                     }
 485
 486                                                     // Delete `databaseIdInt`.
 487                                                     bookmarksDatabaseHelper.deleteBookmark(databaseIdInt);
 488                                                 }
 489
 490                                                 // Update the display order.
 491                                                 for (int i = 0; i < bookmarksListView.getCount(); i++) {
 492                                                     // Get the database ID for the current bookmark.
 493                                                     int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 494
 495                                                     // Move `bookmarksCursor` to the current bookmark position.
 496                                                     bookmarksCursor.moveToPosition(i);
 497
 498                                                     // Update the display order only if it is not correct in the database.
 499                                                     if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
 500                                                         bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
 501                                                     }
 502                                                 }
 503                                                 break;
 504                                         }
 505                                     }
 506                                 })
 507                                 .show();
 508
 509                         // Close the contextual app bar.
 510                         mode.finish();
 511                         break;
 512
 513                     case R.id.context_menu_select_all_bookmarks:
 514                         numberOfBookmarks = bookmarksListView.getCount();
 515
 516                         for (int i = 0; i < numberOfBookmarks; i++) {
 517                             bookmarksListView.setItemChecked(i, true);
 518                         }
 519                         break;
 520                 }
 521                 // Consume the click.
 522                 return true;
 523             }
 524
 525             @Override
 526             public void onDestroyActionMode(ActionMode mode) {
 527
 528             }
 529         });
 530
 531         // Get handles for the `FloatingActionButtons.
 532         FloatingActionButton createBookmarkFolderFab = (FloatingActionButton) findViewById(R.id.create_bookmark_folder_fab);
 533         FloatingActionButton createBookmarkFab = (FloatingActionButton) findViewById(R.id.create_bookmark_fab);
 534
 535         // Set the create new bookmark folder FAB to display the dialog box.
 536         createBookmarkFolderFab.setOnClickListener(new View.OnClickListener() {
 537             @Override
 538             public void onClick(View v) {
 539                 // Show the `CreateBookmarkFolderDialog` `AlertDialog` and name the instance `@string/create_folder`.
 540                 AppCompatDialogFragment createBookmarkFolderDialog = new CreateBookmarkFolderDialog();
 541                 createBookmarkFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.create_folder));
 542             }
 543         });
 544
 545         // Set the create new bookmark FAB to display the dialog box.
 546         createBookmarkFab.setOnClickListener(new View.OnClickListener() {
 547             @Override
 548             public void onClick(View view) {
 549                 // Show the `CreateBookmarkDialog` `AlertDialog` and name the instance `@string/create_bookmark`.
 550                 AppCompatDialogFragment createBookmarkDialog = new CreateBookmarkDialog();
 551                 createBookmarkDialog.show(getSupportFragmentManager(), getResources().getString(R.string.create_bookmark));
 552             }
 553         });
 554     }
 555
 556     @Override
 557     public boolean onCreateOptionsMenu(Menu menu) {
 558         // Inflate the menu.
 559         getMenuInflater().inflate(R.menu.bookmarks_options_menu, menu);
 560
 561         // Success.
 562         return true;
 563     }
 564
 565     @Override
 566     public boolean onOptionsItemSelected(MenuItem menuItem) {
 567         // Get the ID of the `MenuItem` that was selected.
 568         int menuItemId = menuItem.getItemId();
 569
 570         switch (menuItemId) {
 571             case android.R.id.home:  // The home arrow is identified as `android.R.id.home`, not just `R.id.home`.
 572                 if (currentFolder.isEmpty()) {  // Exit BookmarksActivity if currently in the home folder.
 573                     NavUtils.navigateUpFromSameTask(this);
 574                 } else {  // Navigate up one folder.
 575                     // Place the former parent folder in `currentFolder`.
 576                     currentFolder = bookmarksDatabaseHelper.getParentFolder(currentFolder);
 577
 578                     // Update `bookmarksListView`.
 579                     updateBookmarksListView(currentFolder);
 580                 }
 581                 break;
 582
 583             case R.id.options_menu_select_all_bookmarks:
 584                 int numberOfBookmarks = bookmarksListView.getCount();
 585
 586                 for (int i = 0; i < numberOfBookmarks; i++) {
 587                     bookmarksListView.setItemChecked(i, true);
 588                 }
 589                 break;
 590
 591             case R.id.bookmarks_database_view:
 592                 // Launch `BookmarksDatabaseViewActivity`.
 593                 Intent bookmarksDatabaseViewIntent = new Intent(this, BookmarksDatabaseViewActivity.class);
 594                 startActivity(bookmarksDatabaseViewIntent);
 595                 break;
 596         }
 597         return true;
 598     }
 599
 600     @Override
 601     public void onBackPressed() {
 602         if (currentFolder.isEmpty()) {  // Exit BookmarksActivity if currently in the home folder.
 603             super.onBackPressed();
 604         } else {  // Navigate up one folder.
 605             // Place the former parent folder in `currentFolder`.
 606             currentFolder = bookmarksDatabaseHelper.getParentFolder(currentFolder);
 607
 608             // Reload the `ListView`.
 609             updateBookmarksListView(currentFolder);
 610         }
 611     }
 612
 613     @Override
 614     public void onCreateBookmark(AppCompatDialogFragment dialogFragment) {
 615         // Get the `EditTexts` from the `dialogFragment`.
 616         EditText createBookmarkNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.create_bookmark_name_edittext);
 617         EditText createBookmarkUrlEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.create_bookmark_url_edittext);
 618
 619         // Extract the strings from the `EditTexts`.
 620         String bookmarkNameString = createBookmarkNameEditText.getText().toString();
 621         String bookmarkUrlString = createBookmarkUrlEditText.getText().toString();
 622
 623         // Convert the favoriteIcon Bitmap to a byte array.
 624         ByteArrayOutputStream favoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
 625         // `0` is for lossless compression (the only option for a PNG).
 626         MainWebViewActivity.favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, favoriteIconByteArrayOutputStream);
 627         byte[] favoriteIconByteArray = favoriteIconByteArrayOutputStream.toByteArray();
 628
 629         // Display the new bookmark below the current items in the (0 indexed) list.
 630         int newBookmarkDisplayOrder = bookmarksListView.getCount();
 631
 632         // Create the bookmark.
 633         bookmarksDatabaseHelper.createBookmark(bookmarkNameString, bookmarkUrlString, newBookmarkDisplayOrder, currentFolder, favoriteIconByteArray);
 634
 635         // Refresh the `ListView`.  `setSelection` scrolls to the bottom of the list.
 636         updateBookmarksListView(currentFolder);
 637         bookmarksListView.setSelection(newBookmarkDisplayOrder);
 638     }
 639
 640     @Override
 641     public void onCreateBookmarkFolder(AppCompatDialogFragment dialogFragment) {
 642         // Get `create_folder_name_edit_text` and extract the string.
 643         EditText createFolderNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.create_folder_name_edittext);
 644         String folderNameString = createFolderNameEditText.getText().toString();
 645
 646         // Get the new folder icon `Bitmap`.
 647         RadioButton defaultFolderIconRadioButton = (RadioButton) dialogFragment.getDialog().findViewById(R.id.create_folder_default_icon_radiobutton);
 648         Bitmap folderIconBitmap;
 649         if (defaultFolderIconRadioButton.isChecked()) {
 650             // Get the default folder icon `ImageView` from the `Dialog` and convert it to a `Bitmap`.
 651             ImageView folderIconImageView = (ImageView) dialogFragment.getDialog().findViewById(R.id.create_folder_default_icon);
 652             Drawable folderIconDrawable = folderIconImageView.getDrawable();
 653             BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 654             folderIconBitmap = folderIconBitmapDrawable.getBitmap();
 655         } else {  // Assign `favoriteIcon` from the `WebView`.
 656             folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 657         }
 658
 659         // Convert `folderIconBitmap` to a byte array.  `0` is for lossless compression (the only option for a PNG).
 660         ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
 661         folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
 662         byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
 663
 664         // Move all the bookmarks down one in the display order.
 665         for (int i = 0; i < bookmarksListView.getCount(); i++) {
 666             int databaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 667             bookmarksDatabaseHelper.updateDisplayOrder(databaseId, i + 1);
 668         }
 669
 670         // Create the folder, placing it at the top of the ListView
 671         bookmarksDatabaseHelper.createFolder(folderNameString, 0, currentFolder, folderIconByteArray);
 672
 673         // Refresh the ListView.
 674         updateBookmarksListView(currentFolder);
 675     }
 676
 677     @Override
 678     public void onSaveEditBookmark(AppCompatDialogFragment dialogFragment) {
 679         // Get a long array with the the databaseId of the selected bookmark and convert it to an `int`.
 680         long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
 681         int selectedBookmarkDatabaseId = (int) selectedBookmarksLongArray[0];
 682
 683         // Get the `EditText`s from the `editBookmarkDialogFragment` and extract the strings.
 684         EditText editBookmarkNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.edit_bookmark_name_edittext);
 685         String bookmarkNameString = editBookmarkNameEditText.getText().toString();
 686         EditText editBookmarkUrlEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.edit_bookmark_url_edittext);
 687         String bookmarkUrlString = editBookmarkUrlEditText.getText().toString();
 688
 689         // Get `edit_bookmark_current_icon_radiobutton`.
 690         RadioButton currentBookmarkIconRadioButton = (RadioButton) dialogFragment.getDialog().findViewById(R.id.edit_bookmark_current_icon_radiobutton);
 691
 692         if (currentBookmarkIconRadioButton.isChecked()) {  // Update the bookmark without changing the favorite icon.
 693             bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString);
 694         } else {  // Update the bookmark using the `WebView` favorite icon.
 695             ByteArrayOutputStream newFavoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
 696             MainWebViewActivity.favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFavoriteIconByteArrayOutputStream);
 697             byte[] newFavoriteIconByteArray = newFavoriteIconByteArrayOutputStream.toByteArray();
 698
 699             //  Update the bookmark and the favorite icon.
 700             bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString, newFavoriteIconByteArray);
 701         }
 702
 703         // Close the contextual action mode.
 704         contextualActionMode.finish();
 705
 706         // Refresh the `ListView`.  `setSelection` scrolls to the position of the bookmark that was edited.
 707         updateBookmarksListView(currentFolder);
 708         bookmarksListView.setSelection(selectedBookmarkPosition);
 709     }
 710
 711     @Override
 712     public void onEditBookmarkFolder(AppCompatDialogFragment dialogFragment) {
 713         // Get the new folder name.
 714         EditText editFolderNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.edit_folder_name_edittext);
 715         String newFolderNameString = editFolderNameEditText.getText().toString();
 716
 717         // Get a long array with the the database ID of the selected folder and convert it to an `int`.
 718         long[] selectedFolderLongArray = bookmarksListView.getCheckedItemIds();
 719         int selectedFolderDatabaseId = (int) selectedFolderLongArray[0];
 720
 721         // Get the `RadioButtons` from the `Dialog`.
 722         RadioButton currentFolderIconRadioButton = (RadioButton) dialogFragment.getDialog().findViewById(R.id.edit_folder_current_icon_radiobutton);
 723         RadioButton defaultFolderIconRadioButton = (RadioButton) dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon_radiobutton);
 724
 725         // Check if the favorite icon has changed.
 726         if (currentFolderIconRadioButton.isChecked()) {  // Only the name has changed.
 727             // Update the name in the database.
 728             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, oldFolderNameString, newFolderNameString);
 729         } else if (!currentFolderIconRadioButton.isChecked() && newFolderNameString.equals(oldFolderNameString)) {  // Only the icon has changed.
 730             // Get the new folder icon `Bitmap`.
 731             Bitmap folderIconBitmap;
 732             if (defaultFolderIconRadioButton.isChecked()) {
 733                 // Get the default folder icon `ImageView` from the `Drawable` and convert it to a `Bitmap`.
 734                 ImageView folderIconImageView = (ImageView) dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon);
 735                 Drawable folderIconDrawable = folderIconImageView.getDrawable();
 736                 BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 737                 folderIconBitmap = folderIconBitmapDrawable.getBitmap();
 738             } else {  // Get the web page icon `ImageView` from the `Dialog`.
 739                 folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 740             }
 741
 742             // Convert the folder `Bitmap` to a byte array.  `0` is for lossless compression (the only option for a PNG).
 743             ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
 744             folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
 745             byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
 746
 747             // Update the folder icon in the database.
 748             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, folderIconByteArray);
 749         } else {  // The folder icon and the name have changed.
 750             // Get the new folder icon `Bitmap`.
 751             Bitmap folderIconBitmap;
 752             if (defaultFolderIconRadioButton.isChecked()) {
 753                 // Get the default folder icon `ImageView` from the `Drawable` and convert it to a `Bitmap`.
 754                 ImageView folderIconImageView = (ImageView) dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon);
 755                 Drawable folderIconDrawable = folderIconImageView.getDrawable();
 756                 BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 757                 folderIconBitmap = folderIconBitmapDrawable.getBitmap();
 758             } else {  // Get the web page icon `ImageView` from the `Dialog`.
 759                 folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 760             }
 761
 762             // Convert the folder `Bitmap` to a byte array.  `0` is for lossless compression (the only option for a PNG).
 763             ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
 764             folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
 765             byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
 766
 767             // Update the folder name and icon in the database.
 768             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, oldFolderNameString, newFolderNameString, folderIconByteArray);
 769         }
 770
 771         // Refresh the `ListView`.  `setSelection` scrolls to the position of the folder that was edited.
 772         updateBookmarksListView(currentFolder);
 773         bookmarksListView.setSelection(selectedBookmarkPosition - 5);
 774
 775         // Close the contextual action mode.
 776         contextualActionMode.finish();
 777     }
 778
 779     @Override
 780     public void onMoveToFolder(AppCompatDialogFragment dialogFragment) {
 781         // Get the new folder database id.
 782         ListView folderListView = (ListView) dialogFragment.getDialog().findViewById(R.id.move_to_folder_listview);
 783         long[] newFolderLongArray = folderListView.getCheckedItemIds();
 784
 785         // Get the new folder database ID.
 786         int newFolderDatabaseId = (int) newFolderLongArray[0];
 787
 788         // Instantiate `newFolderName`.
 789         String newFolderName;
 790
 791         if (newFolderDatabaseId == 0) {
 792             // The new folder is the home folder, represented as `""` in the database.
 793             newFolderName = "";
 794         } else {
 795             // Get the new folder name from the database.
 796             newFolderName = bookmarksDatabaseHelper.getFolderName(newFolderDatabaseId);
 797         }
 798
 799         // Get a long array with the the database ID of the selected bookmarks.
 800         long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
 801         for (long databaseIdLong : selectedBookmarksLongArray) {
 802             // Get `databaseIdInt` for each selected bookmark.
 803             int databaseIdInt = (int) databaseIdLong;
 804
 805             // Move the selected bookmark to the new folder.
 806             bookmarksDatabaseHelper.moveToFolder(databaseIdInt, newFolderName);
 807         }
 808
 809         // Refresh the `ListView`.
 810         updateBookmarksListView(currentFolder);
 811
 812         // Close the contextual app bar.
 813         contextualActionMode.finish();
 814     }
 815
 816     private void updateBookmarksListView(String folderName) {
 817         // Get a `Cursor` with the current contents of the bookmarks database.
 818         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(folderName);
 819
 820         // Setup `bookmarksCursorAdapter` with `this` context.  `false` disables `autoRequery`.
 821         CursorAdapter bookmarksCursorAdapter = new CursorAdapter(this, bookmarksCursor, false) {
 822             @Override
 823             public View newView(Context context, Cursor cursor, ViewGroup parent) {
 824                 // Inflate the individual item layout.  `false` does not attach it to the root.
 825                 return getLayoutInflater().inflate(R.layout.bookmarks_item_linearlayout, parent, false);
 826             }
 827
 828             @Override
 829             public void bindView(View view, Context context, Cursor cursor) {
 830                 // Get the favorite icon byte array from the `Cursor`.
 831                 byte[] favoriteIconByteArray = cursor.getBlob(cursor.getColumnIndex(BookmarksDatabaseHelper.FAVORITE_ICON));
 832
 833                 // Convert the byte array to a `Bitmap` beginning at the first byte and ending at the last.
 834                 Bitmap favoriteIconBitmap = BitmapFactory.decodeByteArray(favoriteIconByteArray, 0, favoriteIconByteArray.length);
 835
 836                 // Display the bitmap in `bookmarkFavoriteIcon`.
 837                 ImageView bookmarkFavoriteIcon = (ImageView) view.findViewById(R.id.bookmark_favorite_icon);
 838                 bookmarkFavoriteIcon.setImageBitmap(favoriteIconBitmap);
 839
 840
 841                 // Get the bookmark name from the cursor and display it in `bookmarkNameTextView`.
 842                 String bookmarkNameString = cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 843                 TextView bookmarkNameTextView = (TextView) view.findViewById(R.id.bookmark_name);
 844                 bookmarkNameTextView.setText(bookmarkNameString);
 845
 846                 // Make the font bold for folders.
 847                 if (cursor.getInt(cursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1) {
 848                     bookmarkNameTextView.setTypeface(Typeface.DEFAULT_BOLD);
 849                 } else {  // Reset the font to default for normal bookmarks.
 850                     bookmarkNameTextView.setTypeface(Typeface.DEFAULT);
 851                 }
 852             }
 853         };
 854
 855         // Update the ListView.
 856         bookmarksListView.setAdapter(bookmarksCursorAdapter);
 857
 858         // Set the AppBar title.
 859         if (currentFolder.isEmpty()) {
 860             appBar.setTitle(R.string.bookmarks);
 861         } else {
 862             appBar.setTitle(currentFolder);
 863         }
 864     }
 865
 866     private void updateBookmarksListViewExcept(long[] exceptIdLongArray, String folderName) {
 867         // Get a `Cursor` with the current contents of the bookmarks database except for the specified database IDs.
 868         bookmarksCursor = bookmarksDatabaseHelper.getBookmarksCursorExcept(exceptIdLongArray, folderName);
 869
 870         // Setup `bookmarksCursorAdapter` with `this` context.  `false` disables autoRequery.
 871         CursorAdapter bookmarksCursorAdapter = new CursorAdapter(this, bookmarksCursor, false) {
 872             @Override
 873             public View newView(Context context, Cursor cursor, ViewGroup parent) {
 874                 // Inflate the individual item layout.  `false` does not attach it to the root.
 875                 return getLayoutInflater().inflate(R.layout.bookmarks_item_linearlayout, parent, false);
 876             }
 877
 878             @Override
 879             public void bindView(View view, Context context, Cursor cursor) {
 880                 // Get the favorite icon byte array from the cursor.
 881                 byte[] favoriteIconByteArray = cursor.getBlob(cursor.getColumnIndex(BookmarksDatabaseHelper.FAVORITE_ICON));
 882
 883                 // Convert the byte array to a Bitmap beginning at the first byte and ending at the last.
 884                 Bitmap favoriteIconBitmap = BitmapFactory.decodeByteArray(favoriteIconByteArray, 0, favoriteIconByteArray.length);
 885
 886                 // Display the bitmap in `bookmarkFavoriteIcon`.
 887                 ImageView bookmarkFavoriteIcon = (ImageView) view.findViewById(R.id.bookmark_favorite_icon);
 888                 bookmarkFavoriteIcon.setImageBitmap(favoriteIconBitmap);
 889
 890
 891                 // Get the bookmark name from the cursor and display it in `bookmarkNameTextView`.
 892                 String bookmarkNameString = cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 893                 TextView bookmarkNameTextView = (TextView) view.findViewById(R.id.bookmark_name);
 894                 bookmarkNameTextView.setText(bookmarkNameString);
 895
 896                 // Make the font bold for folders.
 897                 if (cursor.getInt(cursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1) {
 898                     // The first argument is `null` because we don't want to change the font.
 899                     bookmarkNameTextView.setTypeface(null, Typeface.BOLD);
 900                 } else {  // Reset the font to default.
 901                     bookmarkNameTextView.setTypeface(Typeface.DEFAULT);
 902                 }
 903             }
 904         };
 905
 906         // Update the `ListView`.
 907         bookmarksListView.setAdapter(bookmarksCursorAdapter);
 908     }
 909
 910     private void deleteBookmarkFolderContents(int databaseId) {
 911         // Get the name of the folder.
 912         String folderName = bookmarksDatabaseHelper.getFolderName(databaseId);
 913
 914         // Get the contents of the folder.
 915         Cursor folderCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(folderName);
 916
 917         for (int i = 0; i < folderCursor.getCount(); i++) {
 918             // Move `folderCursor` to the current row.
 919             folderCursor.moveToPosition(i);
 920
 921             // Get the database ID of the item.
 922             int itemDatabaseId = folderCursor.getInt(folderCursor.getColumnIndex(BookmarksDatabaseHelper._ID));
 923
 924             // If this is a folder, delete the contents first.
 925             if (bookmarksDatabaseHelper.isFolder(itemDatabaseId)) {
 926                 deleteBookmarkFolderContents(itemDatabaseId);
 927             }
 928
 929             bookmarksDatabaseHelper.deleteBookmark(itemDatabaseId);
 930         }
 931     }
 932 }