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

   1 /*
   2  * Copyright © 2016-2019 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.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 // `AppCompatDialogFragment` is required instead of `DialogFragment` or an error is produced on API <=22.
  38 import android.support.v7.app.AppCompatDialogFragment;
  39 import android.support.v7.widget.Toolbar;
  40 import android.util.SparseBooleanArray;
  41 import android.view.ActionMode;
  42 import android.view.Menu;
  43 import android.view.MenuItem;
  44 import android.view.View;
  45 import android.view.ViewGroup;
  46 import android.view.WindowManager;
  47 import android.widget.AbsListView;
  48 import android.widget.CursorAdapter;
  49 import android.widget.EditText;
  50 import android.widget.ImageView;
  51 import android.widget.ListView;
  52 import android.widget.RadioButton;
  53 import android.widget.TextView;
  54
  55 import com.stoutner.privacybrowser.dialogs.CreateBookmarkDialog;
  56 import com.stoutner.privacybrowser.dialogs.CreateBookmarkFolderDialog;
  57 import com.stoutner.privacybrowser.dialogs.EditBookmarkDialog;
  58 import com.stoutner.privacybrowser.dialogs.EditBookmarkFolderDialog;
  59 import com.stoutner.privacybrowser.dialogs.MoveToFolderDialog;
  60 import com.stoutner.privacybrowser.R;
  61 import com.stoutner.privacybrowser.helpers.BookmarksDatabaseHelper;
  62
  63 import java.io.ByteArrayOutputStream;
  64
  65 public class BookmarksActivity extends AppCompatActivity implements CreateBookmarkDialog.CreateBookmarkListener, CreateBookmarkFolderDialog.CreateBookmarkFolderListener, EditBookmarkDialog.EditBookmarkListener,
  66         EditBookmarkFolderDialog.EditBookmarkFolderListener, MoveToFolderDialog.MoveToFolderListener {
  67
  68     // `currentFolder` is public static so it can be accessed from `MoveToFolderDialog`.
  69     // It is used in `onCreate`, `onOptionsItemSelected()`, `onBackPressed()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`,
  70     // and `loadFolder()`.
  71     public static String currentFolder;
  72
  73     // `checkedItemIds` is public static so it can be accessed from `MoveToFolderDialog`.  It is also used in `onCreate()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`,
  74     // and `updateMoveIcons()`.
  75     public static long[] checkedItemIds;
  76
  77
  78     // `bookmarksDatabaseHelper` is used in `onCreate()`, `onOptionsItemSelected()`, `onBackPressed()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`,
  79     // `onMoveToFolder()`, `deleteBookmarkFolderContents()`, `loadFolder()`, and `onDestroy()`.
  80     private BookmarksDatabaseHelper bookmarksDatabaseHelper;
  81
  82     // `bookmarksListView` is used in `onCreate()`, `onOptionsItemSelected()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`,
  83     // `updateMoveIcons()`, `scrollBookmarks()`, and `loadFolder()`.
  84     private ListView bookmarksListView;
  85
  86     // `bookmarksCursor` is used in `onCreate()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`, `deleteBookmarkFolderContents()`,
  87     // `loadFolder()`, and `onDestroy()`.
  88     private Cursor bookmarksCursor;
  89
  90     // `bookmarksCursorAdapter` is used in `onCreate(), `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`, and `onLoadFolder()`.
  91     private CursorAdapter bookmarksCursorAdapter;
  92
  93     // `contextualActionMode` is used in `onCreate()`, `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()` and `onMoveToFolder()`.
  94     private ActionMode contextualActionMode;
  95
  96     // `appBar` is used in `onCreate()` and `loadFolder()`.
  97     private ActionBar appBar;
  98
  99     // `oldFolderName` is used in `onCreate()` and `onSaveBookmarkFolder()`.
 100     private String oldFolderNameString;
 101
 102     // `moveBookmarkUpMenuItem` is used in `onCreate()` and `updateMoveIcons()`.
 103     private MenuItem moveBookmarkUpMenuItem;
 104
 105     // `moveBookmarkDownMenuItem` is used in `onCreate()` and `updateMoveIcons()`.
 106     private MenuItem moveBookmarkDownMenuItem;
 107
 108     // `bookmarksDeletedSnackbar` is used in `onCreate()`, `onOptionsItemSelected()`, and `onBackPressed()`.
 109     private Snackbar bookmarksDeletedSnackbar;
 110
 111     // `closeActivityAfterDismissingSnackbar` is used in `onCreate()`, `onOptionsItemSelected()`, and `onBackPressed()`.
 112     private boolean closeActivityAfterDismissingSnackbar;
 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         // Get the intent that launched the activity.
 132         Intent launchingIntent = getIntent();
 133
 134         // Set the current folder variable.
 135         if (launchingIntent.getStringExtra("Current Folder") != null) {  // Set the current folder from the intent.
 136             currentFolder = launchingIntent.getStringExtra("Current Folder");
 137         } else {  // Set the current folder to be `""`, which is the home folder.
 138             currentFolder = "";
 139         }
 140
 141         // Set the content view.
 142         setContentView(R.layout.bookmarks_coordinatorlayout);
 143
 144         // Use the `SupportActionBar` from `android.support.v7.app.ActionBar` until the minimum API is >= 21.
 145         final Toolbar bookmarksAppBar = findViewById(R.id.bookmarks_toolbar);
 146         setSupportActionBar(bookmarksAppBar);
 147
 148         // Get a handle for the activity, the app bar, and the ListView.
 149         final Activity bookmarksActivity = this;
 150         appBar = getSupportActionBar();
 151         bookmarksListView = findViewById(R.id.bookmarks_listview);
 152
 153         // Remove the incorrect lint warning that `appBar` might be null.
 154         assert appBar != null;
 155
 156         // Display the home arrow on the app bar.
 157         appBar.setDisplayHomeAsUpEnabled(true);
 158
 159         // Initialize the database helper.  `this` specifies the context.  The two `nulls` do not specify the database name or a `CursorFactory`.
 160         // The `0` specifies a database version, but that is ignored and set instead using a constant in `BookmarksDatabaseHelper`.
 161         bookmarksDatabaseHelper = new BookmarksDatabaseHelper(this, null, null, 0);
 162
 163         // Load the home folder.
 164         loadFolder();
 165
 166         // Set a listener so that tapping a list item loads the URL or folder.
 167         bookmarksListView.setOnItemClickListener((parent, view, position, id) -> {
 168             // Convert the id from long to int to match the format of the bookmarks database.
 169             int databaseID = (int) id;
 170
 171             // Get the bookmark cursor for this ID and move it to the first row.
 172             Cursor bookmarkCursor = bookmarksDatabaseHelper.getBookmarkCursor(databaseID);
 173             bookmarkCursor.moveToFirst();
 174
 175             // Act upon the bookmark according to the type.
 176             if (bookmarkCursor.getInt(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1) {  // The selected bookmark is a folder.
 177                 // Update the current folder.
 178                 currentFolder = bookmarkCursor.getString(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 179
 180                 // Load the new folder.
 181                 loadFolder();
 182             } else {  // The selected bookmark is not a folder.
 183                 // Get the bookmark URL and assign it to `formattedUrlString`.
 184                 MainWebViewActivity.formattedUrlString = bookmarkCursor.getString(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_URL));
 185
 186                 // Set `MainWebViewActivity` to load the new URL on restart.
 187                 MainWebViewActivity.loadUrlOnRestart = true;
 188
 189                 // Update the bookmarks folder for the bookmarks drawer in `MainWebViewActivity`.
 190                 MainWebViewActivity.currentBookmarksFolder = currentFolder;
 191
 192                 // Close the bookmarks drawer and reload the bookmarks `ListView` when returning to `MainWebViewActivity`.
 193                 MainWebViewActivity.restartFromBookmarksActivity = true;
 194
 195                 // Return to `MainWebViewActivity`.
 196                 NavUtils.navigateUpFromSameTask(bookmarksActivity);
 197             }
 198
 199             // Close the `Cursor`.
 200             bookmarkCursor.close();
 201         });
 202
 203         // Get a handle for the activity.
 204         Activity activity = this;
 205
 206         // `MultiChoiceModeListener` handles long clicks.
 207         bookmarksListView.setMultiChoiceModeListener(new AbsListView.MultiChoiceModeListener() {
 208             // Instantiate the common variables.
 209             MenuItem editBookmarkMenuItem;
 210             MenuItem deleteBookmarksMenuItem;
 211             MenuItem selectAllBookmarksMenuItem;
 212             boolean deletingBookmarks;
 213
 214             @Override
 215             public boolean onCreateActionMode(ActionMode mode, Menu menu) {
 216                 // Inflate the menu for the contextual app bar and set the title.
 217                 getMenuInflater().inflate(R.menu.bookmarks_context_menu, menu);
 218
 219                 // Set the title.
 220                 if (currentFolder.isEmpty()) {
 221                     // Use `R.string.bookmarks` if we are in the home folder.
 222                     mode.setTitle(R.string.bookmarks);
 223                 } else {  // Use the current folder name as the title.
 224                     mode.setTitle(currentFolder);
 225                 }
 226
 227                 // Get a handle for `MenuItems` that need to be selectively disabled.
 228                 moveBookmarkUpMenuItem = menu.findItem(R.id.move_bookmark_up);
 229                 moveBookmarkDownMenuItem = menu.findItem(R.id.move_bookmark_down);
 230                 editBookmarkMenuItem = menu.findItem(R.id.edit_bookmark);
 231                 deleteBookmarksMenuItem = menu.findItem(R.id.delete_bookmark);
 232                 selectAllBookmarksMenuItem = menu.findItem(R.id.context_menu_select_all_bookmarks);
 233
 234                 // Disable the delete bookmarks menu item if a delete is pending.
 235                 if (deletingBookmarks) {
 236                     deleteBookmarksMenuItem.setEnabled(false);
 237                 }
 238
 239                 // Store `contextualActionMode` so it can be closed programatically.
 240                 contextualActionMode = mode;
 241
 242                 // Make it so.
 243                 return true;
 244             }
 245
 246             @Override
 247             public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
 248                 // Get a handle for the move to folder menu item.
 249                 MenuItem moveToFolderMenuItem = menu.findItem(R.id.move_to_folder);
 250
 251                 // Get a `Cursor` with all of the folders.
 252                 Cursor folderCursor = bookmarksDatabaseHelper.getAllFoldersCursor();
 253
 254                 // Enable the move to folder menu item if at least one folder exists.
 255                 moveToFolderMenuItem.setVisible(folderCursor.getCount() > 0);
 256
 257                 // Make it so.
 258                 return true;
 259             }
 260
 261             @Override
 262             public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
 263                 // Get a long array of the selected bookmarks.
 264                 long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
 265
 266                 // Calculate the number of selected bookmarks.
 267                 int numberOfSelectedBookmarks = selectedBookmarksLongArray.length;
 268
 269                 // Adjust the `ActionMode` and the `Menu` according to the number of selected bookmarks.
 270                 if (numberOfSelectedBookmarks == 0) {  // No bookmarks are selected.
 271                     // Close the `ActionMode`.
 272                     mode.finish();
 273                 } else if (numberOfSelectedBookmarks == 1) {  // One bookmark is selected.
 274                     // List the number of selected bookmarks in the subtitle.
 275                     mode.setSubtitle(getString(R.string.selected) + "  1");
 276
 277                     // Show the `Move Up`, `Move Down`, and  `Edit` options.
 278                     moveBookmarkUpMenuItem.setVisible(true);
 279                     moveBookmarkDownMenuItem.setVisible(true);
 280                     editBookmarkMenuItem.setVisible(true);
 281
 282                     // Update the enabled status of the move icons.
 283                     updateMoveIcons();
 284                 } else {  // More than one bookmark is selected.
 285                     // List the number of selected bookmarks in the subtitle.
 286                     mode.setSubtitle(getString(R.string.selected) + "  " + numberOfSelectedBookmarks);
 287
 288                     // Hide non-applicable `MenuItems`.
 289                     moveBookmarkUpMenuItem.setVisible(false);
 290                     moveBookmarkDownMenuItem.setVisible(false);
 291                     editBookmarkMenuItem.setVisible(false);
 292                 }
 293
 294                 // Do not show `Select All` if all the bookmarks are already checked.
 295                 if (bookmarksListView.getCheckedItemIds().length == bookmarksListView.getCount()) {
 296                     selectAllBookmarksMenuItem.setVisible(false);
 297                 } else {
 298                     selectAllBookmarksMenuItem.setVisible(true);
 299                 }
 300             }
 301
 302             @Override
 303             public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
 304                 // Get the menu item ID.
 305                 int menuItemId = item.getItemId();
 306
 307                 // Instantiate the common variables.
 308                 int selectedBookmarkPosition;
 309                 int selectedBookmarkNewPosition;
 310                 final SparseBooleanArray selectedBookmarksPositionsSparseBooleanArray;
 311
 312                 switch (menuItemId) {
 313                     case R.id.move_bookmark_up:
 314                         // Get the array of checked bookmark positions.
 315                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
 316
 317                         // Store the position of the selected bookmark.  Only one bookmark is selected when `move_bookmark_up` is enabled.
 318                         selectedBookmarkPosition = selectedBookmarksPositionsSparseBooleanArray.keyAt(0);
 319
 320                         // Calculate the new position of the selected bookmark.
 321                         selectedBookmarkNewPosition = selectedBookmarkPosition - 1;
 322
 323                         // Iterate through the bookmarks.
 324                         for (int i = 0; i < bookmarksListView.getCount(); i++) {
 325                             // Get the database ID for the current bookmark.
 326                             int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 327
 328                             // Update the display order for the current bookmark.
 329                             if (i == selectedBookmarkPosition) {  // The current bookmark is the selected bookmark.
 330                                 // Move the current bookmark up one.
 331                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i - 1);
 332                             } else if ((i + 1) == selectedBookmarkPosition){  // The current bookmark is immediately above the selected bookmark.
 333                                 // Move the current bookmark down one.
 334                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i + 1);
 335                             } else {  // The current bookmark is not changing positions.
 336                                 // Move `bookmarksCursor` to the current bookmark position.
 337                                 bookmarksCursor.moveToPosition(i);
 338
 339                                 // Update the display order only if it is not correct in the database.
 340                                 if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
 341                                     bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
 342                                 }
 343                             }
 344                         }
 345
 346                         // Update `bookmarksCursor` with the current contents of the bookmarks database.
 347                         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 348
 349                         // Update the `ListView`.
 350                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 351
 352                         // Scroll with the bookmark.
 353                         scrollBookmarks(selectedBookmarkNewPosition);
 354
 355                         // Update the enabled status of the move icons.
 356                         updateMoveIcons();
 357                         break;
 358
 359                     case R.id.move_bookmark_down:
 360                         // Get the array of checked bookmark positions.
 361                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
 362
 363                         // Store the position of the selected bookmark.  Only one bookmark is selected when `move_bookmark_down` is enabled.
 364                         selectedBookmarkPosition = selectedBookmarksPositionsSparseBooleanArray.keyAt(0);
 365
 366                         // Calculate the new position of the selected bookmark.
 367                         selectedBookmarkNewPosition = selectedBookmarkPosition + 1;
 368
 369                         // Iterate through the bookmarks.
 370                         for (int i = 0; i <bookmarksListView.getCount(); i++) {
 371                             // Get the database ID for the current bookmark.
 372                             int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 373
 374                             // Update the display order for the current bookmark.
 375                             if (i == selectedBookmarkPosition) {  // The current bookmark is the selected bookmark.
 376                                 // Move the current bookmark down one.
 377                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i + 1);
 378                             } else if ((i - 1) == selectedBookmarkPosition) {  // The current bookmark is immediately below the selected bookmark.
 379                                 // Move the bookmark below the selected bookmark up one.
 380                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i - 1);
 381                             } else {  // The current bookmark is not changing positions.
 382                                 // Move `bookmarksCursor` to the current bookmark position.
 383                                 bookmarksCursor.moveToPosition(i);
 384
 385                                 // Update the display order only if it is not correct in the database.
 386                                 if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
 387                                     bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
 388                                 }
 389                             }
 390                         }
 391
 392                         // Update `bookmarksCursor` with the current contents of the bookmarks database.
 393                         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 394
 395                         // Update the `ListView`.
 396                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 397
 398                         // Scroll with the bookmark.
 399                         scrollBookmarks(selectedBookmarkNewPosition);
 400
 401                         // Update the enabled status of the move icons.
 402                         updateMoveIcons();
 403                         break;
 404
 405                     case R.id.move_to_folder:
 406                         // Store `checkedItemIds` for use by the `AlertDialog`.
 407                         checkedItemIds = bookmarksListView.getCheckedItemIds();
 408
 409                         // Show the `MoveToFolderDialog` `AlertDialog` and name the instance `@string/move_to_folder
 410                         AppCompatDialogFragment moveToFolderDialog = new MoveToFolderDialog();
 411                         moveToFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.move_to_folder));
 412                         break;
 413
 414                     case R.id.edit_bookmark:
 415                         // Get the array of checked bookmark positions.
 416                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
 417
 418                         // Get the position of the selected bookmark.  Only one bookmark is selected when `edit_bookmark_down` is enabled.
 419                         selectedBookmarkPosition = selectedBookmarksPositionsSparseBooleanArray.keyAt(0);
 420
 421                         // Move the `Cursor` to the selected position and find out if it is a folder.
 422                         bookmarksCursor.moveToPosition(selectedBookmarkPosition);
 423                         boolean isFolder = (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1);
 424
 425                         // Get the selected bookmark database ID.
 426                         int databaseId = bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper._ID));
 427
 428                         // Show the edit bookmark or edit bookmark folder dialog.
 429                         if (isFolder) {
 430                             // Save the current folder name, which is used in `onSaveBookmarkFolder()`.
 431                             oldFolderNameString = bookmarksCursor.getString(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 432
 433                             // Show the edit bookmark folder dialog.
 434                             AppCompatDialogFragment editFolderDialog = EditBookmarkFolderDialog.folderDatabaseId(databaseId);
 435                             editFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_folder));
 436                         } else {
 437                             // Show the edit bookmark dialog.
 438                             AppCompatDialogFragment editBookmarkDialog = EditBookmarkDialog.bookmarkDatabaseId(databaseId);
 439                             editBookmarkDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_bookmark));
 440                         }
 441                         break;
 442
 443                     case R.id.delete_bookmark:
 444                         // Set the deleting bookmarks flag, which prevents the delete menu item from being enabled until the current process finishes.
 445                         deletingBookmarks = true;
 446
 447                         // Get an array of the selected row IDs.
 448                         final long[] selectedBookmarksIdsLongArray = bookmarksListView.getCheckedItemIds();
 449
 450                         // Get the array of checked bookmarks.  `.clone()` makes a copy that won't change if `bookmarksListView` is reloaded, which is needed for re-selecting the bookmarks on undelete.
 451                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions().clone();
 452
 453                         // Update `bookmarksCursor` with the current contents of the bookmarks database except for the specified database IDs.
 454                         bookmarksCursor = bookmarksDatabaseHelper.getBookmarksCursorExcept(selectedBookmarksIdsLongArray, currentFolder);
 455
 456                         // Update the `ListView`.
 457                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 458
 459                         // Show a Snackbar with the number of deleted bookmarks.
 460                         bookmarksDeletedSnackbar = Snackbar.make(findViewById(R.id.bookmarks_coordinatorlayout), getString(R.string.bookmarks_deleted) + "  " + selectedBookmarksIdsLongArray.length,
 461                                 Snackbar.LENGTH_LONG).setAction(R.string.undo, view -> {
 462                                     // Do nothing because everything will be handled by `onDismissed()` below.
 463                                 })
 464                                 .addCallback(new Snackbar.Callback() {
 465                                     @Override
 466                                     public void onDismissed(Snackbar snackbar, int event) {
 467                                         switch (event) {
 468                                             // The user pushed the `Undo` button.
 469                                             case Snackbar.Callback.DISMISS_EVENT_ACTION:
 470                                                 // Update `bookmarksCursor` with the current contents of the bookmarks database, including the "deleted" bookmarks.
 471                                                 bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 472
 473                                                 // Update the `ListView`.
 474                                                 bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 475
 476                                                 // Re-select the previously selected bookmarks.
 477                                                 for (int i = 0; i < selectedBookmarksPositionsSparseBooleanArray.size(); i++) {
 478                                                     bookmarksListView.setItemChecked(selectedBookmarksPositionsSparseBooleanArray.keyAt(i), true);
 479                                                 }
 480
 481                                                 break;
 482
 483                                             // The `Snackbar` was dismissed without the `Undo` button being pushed.
 484                                             default:
 485                                                 // Delete each selected bookmark.
 486                                                 for (long databaseIdLong : selectedBookmarksIdsLongArray) {
 487                                                     // Convert `databaseIdLong` to an int.
 488                                                     int databaseIdInt = (int) databaseIdLong;
 489
 490                                                     // Delete the contents of the folder if the selected bookmark is a folder.
 491                                                     if (bookmarksDatabaseHelper.isFolder(databaseIdInt)) {
 492                                                         deleteBookmarkFolderContents(databaseIdInt);
 493                                                     }
 494
 495                                                     // Delete the selected bookmark.
 496                                                     bookmarksDatabaseHelper.deleteBookmark(databaseIdInt);
 497                                                 }
 498
 499                                                 // Update the display order.
 500                                                 for (int i = 0; i < bookmarksListView.getCount(); i++) {
 501                                                     // Get the database ID for the current bookmark.
 502                                                     int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 503
 504                                                     // Move `bookmarksCursor` to the current bookmark position.
 505                                                     bookmarksCursor.moveToPosition(i);
 506
 507                                                     // Update the display order only if it is not correct in the database.
 508                                                     if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
 509                                                         bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
 510                                                     }
 511                                                 }
 512                                         }
 513
 514                                         // Enable the delete bookmarks menu item.
 515                                         deleteBookmarksMenuItem.setEnabled(true);
 516
 517                                         // Reset the deleting bookmarks flag.
 518                                         deletingBookmarks = false;
 519
 520                                         // Close the activity if back has been pressed.
 521                                         if (closeActivityAfterDismissingSnackbar) {
 522                                             // Update the bookmarks folder for the bookmarks drawer in the main WebView activity.
 523                                             MainWebViewActivity.currentBookmarksFolder = currentFolder;
 524
 525                                             // Close the bookmarks drawer and reload the bookmarks ListView when returning to the main WebView activity.
 526                                             MainWebViewActivity.restartFromBookmarksActivity = true;
 527
 528                                             // Return to `MainWebViewActivity`.
 529                                             NavUtils.navigateUpFromSameTask(activity);
 530                                         }
 531                                     }
 532                                 });
 533
 534                         //Show the `SnackBar`.
 535                         bookmarksDeletedSnackbar.show();
 536
 537                         // Close the `ActionBar`.
 538                         mode.finish();
 539                         break;
 540
 541                     case R.id.context_menu_select_all_bookmarks:
 542                         // Get the total number of bookmarks.
 543                         int numberOfBookmarks = bookmarksListView.getCount();
 544
 545                         // Select them all.
 546                         for (int i = 0; i < numberOfBookmarks; i++) {
 547                             bookmarksListView.setItemChecked(i, true);
 548                         }
 549                         break;
 550                 }
 551
 552                 // Consume the click.
 553                 return true;
 554             }
 555
 556             @Override
 557             public void onDestroyActionMode(ActionMode mode) {
 558                 // Do nothing.
 559             }
 560         });
 561
 562         // Get handles for the `FloatingActionButtons`.
 563         FloatingActionButton createBookmarkFolderFab = findViewById(R.id.create_bookmark_folder_fab);
 564         FloatingActionButton createBookmarkFab = findViewById(R.id.create_bookmark_fab);
 565
 566         // Set the create new bookmark folder FAB to display the `AlertDialog`.
 567         createBookmarkFolderFab.setOnClickListener(v -> {
 568             // Show the `CreateBookmarkFolderDialog` `AlertDialog` and name the instance `@string/create_folder`.
 569             AppCompatDialogFragment createBookmarkFolderDialog = new CreateBookmarkFolderDialog();
 570             createBookmarkFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.create_folder));
 571         });
 572
 573         // Set the create new bookmark FAB to display the `AlertDialog`.
 574         createBookmarkFab.setOnClickListener(view -> {
 575             // Show the `CreateBookmarkDialog` `AlertDialog` and name the instance `@string/create_bookmark`.
 576             AppCompatDialogFragment createBookmarkDialog = new CreateBookmarkDialog();
 577             createBookmarkDialog.show(getSupportFragmentManager(), getResources().getString(R.string.create_bookmark));
 578         });
 579     }
 580
 581     @Override
 582     public boolean onCreateOptionsMenu(Menu menu) {
 583         // Inflate the menu.
 584         getMenuInflater().inflate(R.menu.bookmarks_options_menu, menu);
 585
 586         // Success.
 587         return true;
 588     }
 589
 590     @Override
 591     public boolean onOptionsItemSelected(MenuItem menuItem) {
 592         // Get the ID of the menu item that was selected.
 593         int menuItemId = menuItem.getItemId();
 594
 595         switch (menuItemId) {
 596             case android.R.id.home:  // The home arrow is identified as `android.R.id.home`, not just `R.id.home`.
 597                 if (currentFolder.isEmpty()) {  // Currently in the home folder.
 598                     // Go home.
 599                     if ((bookmarksDeletedSnackbar != null) && bookmarksDeletedSnackbar.isShown()) {  // Close the bookmarks delete snackbar before going home.
 600                         // Set the close flag.
 601                         closeActivityAfterDismissingSnackbar = true;
 602
 603                         // Dismiss the snackbar.
 604                         bookmarksDeletedSnackbar.dismiss();
 605                     } else {  // Go home immediately.
 606                         // Update the bookmarks folder for the bookmarks drawer in `MainWebViewActivity`.
 607                         MainWebViewActivity.currentBookmarksFolder = "";
 608
 609                         // Close the bookmarks drawer and reload the bookmarks `ListView` when returning to `MainWebViewActivity`.
 610                         MainWebViewActivity.restartFromBookmarksActivity = true;
 611
 612                         // Return to `MainWebViewActivity`.
 613                         NavUtils.navigateUpFromSameTask(this);
 614                     }
 615                 } else {  // Currently in a subfolder.
 616                     // Place the former parent folder in `currentFolder`.
 617                     currentFolder = bookmarksDatabaseHelper.getParentFolder(currentFolder);
 618
 619                     // Load the new folder.
 620                     loadFolder();
 621                 }
 622                 break;
 623
 624             case R.id.options_menu_select_all_bookmarks:
 625                 // Get the total number of bookmarks.
 626                 int numberOfBookmarks = bookmarksListView.getCount();
 627
 628                 // Select them all.
 629                 for (int i = 0; i < numberOfBookmarks; i++) {
 630                     bookmarksListView.setItemChecked(i, true);
 631                 }
 632                 break;
 633
 634             case R.id.bookmarks_database_view:
 635                 // Launch `BookmarksDatabaseViewActivity`.
 636                 Intent bookmarksDatabaseViewIntent = new Intent(this, BookmarksDatabaseViewActivity.class);
 637                 startActivity(bookmarksDatabaseViewIntent);
 638                 break;
 639         }
 640         return true;
 641     }
 642
 643     @Override
 644     public void onBackPressed() {
 645         // Check to see if a snackbar is currently displayed.  If so, it must be closed before exiting so that a pending delete is completed before reloading the ListView in the bookmarks drawer.
 646         if ((bookmarksDeletedSnackbar != null) && bookmarksDeletedSnackbar.isShown()) {  // Close the bookmarks delete snackbar before going home.
 647             // Set the close flag.
 648             closeActivityAfterDismissingSnackbar = true;
 649
 650             // Dismiss the snackbar.
 651             bookmarksDeletedSnackbar.dismiss();
 652         } else {  // Go home immediately.
 653             // Update the bookmarks folder for the bookmarks drawer in the main WebView activity.
 654             MainWebViewActivity.currentBookmarksFolder = currentFolder;
 655
 656             // Close the bookmarks drawer and reload the bookmarks ListView when returning to the main WebView activity.
 657             MainWebViewActivity.restartFromBookmarksActivity = true;
 658
 659             // Exit `BookmarksActivity`.
 660             super.onBackPressed();
 661         }
 662     }
 663
 664     @Override
 665     public void onCreateBookmark(AppCompatDialogFragment dialogFragment) {
 666         // Get the `EditTexts` from the `dialogFragment`.
 667         EditText createBookmarkNameEditText = dialogFragment.getDialog().findViewById(R.id.create_bookmark_name_edittext);
 668         EditText createBookmarkUrlEditText = dialogFragment.getDialog().findViewById(R.id.create_bookmark_url_edittext);
 669
 670         // Extract the strings from the `EditTexts`.
 671         String bookmarkNameString = createBookmarkNameEditText.getText().toString();
 672         String bookmarkUrlString = createBookmarkUrlEditText.getText().toString();
 673
 674         // Convert the favoriteIcon Bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
 675         ByteArrayOutputStream favoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
 676         MainWebViewActivity.favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, favoriteIconByteArrayOutputStream);
 677         byte[] favoriteIconByteArray = favoriteIconByteArrayOutputStream.toByteArray();
 678
 679         // Display the new bookmark below the current items in the (0 indexed) list.
 680         int newBookmarkDisplayOrder = bookmarksListView.getCount();
 681
 682         // Create the bookmark.
 683         bookmarksDatabaseHelper.createBookmark(bookmarkNameString, bookmarkUrlString, currentFolder, newBookmarkDisplayOrder, favoriteIconByteArray);
 684
 685         // Update `bookmarksCursor` with the current contents of this folder.
 686         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 687
 688         // Update the `ListView`.
 689         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 690
 691         // Scroll to the new bookmark.
 692         bookmarksListView.setSelection(newBookmarkDisplayOrder);
 693     }
 694
 695     @Override
 696     public void onCreateBookmarkFolder(AppCompatDialogFragment dialogFragment) {
 697         // Get handles for the views in `dialogFragment`.
 698         EditText createFolderNameEditText = dialogFragment.getDialog().findViewById(R.id.create_folder_name_edittext);
 699         RadioButton defaultFolderIconRadioButton = dialogFragment.getDialog().findViewById(R.id.create_folder_default_icon_radiobutton);
 700         ImageView folderIconImageView = dialogFragment.getDialog().findViewById(R.id.create_folder_default_icon);
 701
 702         // Get new folder name string.
 703         String folderNameString = createFolderNameEditText.getText().toString();
 704
 705         // Get the new folder icon `Bitmap`.
 706         Bitmap folderIconBitmap;
 707         if (defaultFolderIconRadioButton.isChecked()) {  // Use the default folder icon.
 708             // Get the default folder icon and convert it to a `Bitmap`.
 709             Drawable folderIconDrawable = folderIconImageView.getDrawable();
 710             BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 711             folderIconBitmap = folderIconBitmapDrawable.getBitmap();
 712         } else {  // Use the `WebView` favorite icon.
 713             folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 714         }
 715
 716         // Convert `folderIconBitmap` to a byte array.  `0` is for lossless compression (the only option for a PNG).
 717         ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
 718         folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
 719         byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
 720
 721         // Move all the bookmarks down one in the display order.
 722         for (int i = 0; i < bookmarksListView.getCount(); i++) {
 723             int databaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 724             bookmarksDatabaseHelper.updateDisplayOrder(databaseId, i + 1);
 725         }
 726
 727         // Create the folder, which will be placed at the top of the `ListView`.
 728         bookmarksDatabaseHelper.createFolder(folderNameString, currentFolder, folderIconByteArray);
 729
 730         // Update `bookmarksCursor` with the current contents of this folder.
 731         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 732
 733         // Update the `ListView`.
 734         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 735
 736         // Scroll to the new folder.
 737         bookmarksListView.setSelection(0);
 738     }
 739
 740     @Override
 741     public void onSaveBookmark(AppCompatDialogFragment dialogFragment, int selectedBookmarkDatabaseId) {
 742         // Get handles for the views from `dialogFragment`.
 743         EditText editBookmarkNameEditText = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_name_edittext);
 744         EditText editBookmarkUrlEditText = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_url_edittext);
 745         RadioButton currentBookmarkIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_current_icon_radiobutton);
 746
 747         // Store the bookmark strings.
 748         String bookmarkNameString = editBookmarkNameEditText.getText().toString();
 749         String bookmarkUrlString = editBookmarkUrlEditText.getText().toString();
 750
 751         // Update the bookmark.
 752         if (currentBookmarkIconRadioButton.isChecked()) {  // Update the bookmark without changing the favorite icon.
 753             bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString);
 754         } else {  // Update the bookmark using the `WebView` favorite icon.
 755             // Convert the favorite icon to a byte array.  `0` is for lossless compression (the only option for a PNG).
 756             ByteArrayOutputStream newFavoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
 757             MainWebViewActivity.favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFavoriteIconByteArrayOutputStream);
 758             byte[] newFavoriteIconByteArray = newFavoriteIconByteArrayOutputStream.toByteArray();
 759
 760             //  Update the bookmark and the favorite icon.
 761             bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString, newFavoriteIconByteArray);
 762         }
 763
 764         // Close the contextual action mode.
 765         contextualActionMode.finish();
 766
 767         // Update `bookmarksCursor` with the contents of the current folder.
 768         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 769
 770         // Update the `ListView`.
 771         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 772     }
 773
 774     @Override
 775     public void onSaveBookmarkFolder(AppCompatDialogFragment dialogFragment, int selectedFolderDatabaseId) {
 776         // Get handles for the views from `dialogFragment`.
 777         RadioButton currentFolderIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_folder_current_icon_radiobutton);
 778         RadioButton defaultFolderIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon_radiobutton);
 779         ImageView defaultFolderIconImageView = dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon_imageview);
 780         EditText editFolderNameEditText = dialogFragment.getDialog().findViewById(R.id.edit_folder_name_edittext);
 781
 782         // Get the new folder name.
 783         String newFolderNameString = editFolderNameEditText.getText().toString();
 784
 785         // Check if the favorite icon has changed.
 786         if (currentFolderIconRadioButton.isChecked()) {  // Only the name has changed.
 787             // Update the name in the database.
 788             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, oldFolderNameString, newFolderNameString);
 789         } else if (!currentFolderIconRadioButton.isChecked() && newFolderNameString.equals(oldFolderNameString)) {  // Only the icon has changed.
 790             // Get the new folder icon `Bitmap`.
 791             Bitmap folderIconBitmap;
 792             if (defaultFolderIconRadioButton.isChecked()) {
 793                 // Get the default folder icon and convert it to a `Bitmap`.
 794                 Drawable folderIconDrawable = defaultFolderIconImageView.getDrawable();
 795                 BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 796                 folderIconBitmap = folderIconBitmapDrawable.getBitmap();
 797             } else {  // Use the `WebView` favorite icon.
 798                 folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 799             }
 800
 801             // Convert the folder `Bitmap` to a byte array.  `0` is for lossless compression (the only option for a PNG).
 802             ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
 803             folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
 804             byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
 805
 806             // Update the folder icon in the database.
 807             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, folderIconByteArray);
 808         } else {  // The folder icon and the name have changed.
 809             // Instantiate the new folder icon `Bitmap`.
 810             Bitmap folderIconBitmap;
 811
 812             // Populate the new folder icon bitmap.
 813             if (defaultFolderIconRadioButton.isChecked()) {
 814                 // Get the default folder icon and convert it to a `Bitmap`.
 815                 Drawable folderIconDrawable = defaultFolderIconImageView.getDrawable();
 816                 BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 817                 folderIconBitmap = folderIconBitmapDrawable.getBitmap();
 818             } else {  // Use the `WebView` favorite icon.
 819                 folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 820             }
 821
 822             // Convert the folder `Bitmap` to a byte array.  `0` is for lossless compression (the only option for a PNG).
 823             ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
 824             folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
 825             byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
 826
 827             // Update the folder name and icon in the database.
 828             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, oldFolderNameString, newFolderNameString, folderIconByteArray);
 829         }
 830
 831         // Update `bookmarksCursor` with the current contents of this folder.
 832         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 833
 834         // Update the `ListView`.
 835         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 836
 837         // Close the contextual action mode.
 838         contextualActionMode.finish();
 839     }
 840
 841     @Override
 842     public void onMoveToFolder(AppCompatDialogFragment dialogFragment) {
 843         // Get a handle for the `ListView` from `dialogFragment`.
 844         ListView folderListView = dialogFragment.getDialog().findViewById(R.id.move_to_folder_listview);
 845
 846         // Store a long array of the selected folders.
 847         long[] newFolderLongArray = folderListView.getCheckedItemIds();
 848
 849         // Get the new folder database ID.  Only one folder will be selected.
 850         int newFolderDatabaseId = (int) newFolderLongArray[0];
 851
 852         // Instantiate `newFolderName`.
 853         String newFolderName;
 854
 855         // Set the new folder name.
 856         if (newFolderDatabaseId == 0) {
 857             // The new folder is the home folder, represented as `""` in the database.
 858             newFolderName = "";
 859         } else {
 860             // Get the new folder name from the database.
 861             newFolderName = bookmarksDatabaseHelper.getFolderName(newFolderDatabaseId);
 862         }
 863
 864         // Get a long array with the the database ID of the selected bookmarks.
 865         long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
 866
 867         // Move each of the selected bookmarks to the new folder.
 868         for (long databaseIdLong : selectedBookmarksLongArray) {
 869             // Get `databaseIdInt` for each selected bookmark.
 870             int databaseIdInt = (int) databaseIdLong;
 871
 872             // Move the selected bookmark to the new folder.
 873             bookmarksDatabaseHelper.moveToFolder(databaseIdInt, newFolderName);
 874         }
 875
 876         // Update `bookmarksCursor` with the current contents of this folder.
 877         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 878
 879         // Update the `ListView`.
 880         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 881
 882         // Close the contextual app bar.
 883         contextualActionMode.finish();
 884     }
 885
 886     private void deleteBookmarkFolderContents(int databaseId) {
 887         // Get the name of the folder.
 888         String folderName = bookmarksDatabaseHelper.getFolderName(databaseId);
 889
 890         // Get the contents of the folder.
 891         Cursor folderCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(folderName);
 892
 893         // Delete each of the bookmarks in the folder.
 894         for (int i = 0; i < folderCursor.getCount(); i++) {
 895             // Move `folderCursor` to the current row.
 896             folderCursor.moveToPosition(i);
 897
 898             // Get the database ID of the item.
 899             int itemDatabaseId = folderCursor.getInt(folderCursor.getColumnIndex(BookmarksDatabaseHelper._ID));
 900
 901             // If this is a folder, recursively delete the contents first.
 902             if (bookmarksDatabaseHelper.isFolder(itemDatabaseId)) {
 903                 deleteBookmarkFolderContents(itemDatabaseId);
 904             }
 905
 906             // Delete the bookmark.
 907             bookmarksDatabaseHelper.deleteBookmark(itemDatabaseId);
 908         }
 909     }
 910
 911     private void updateMoveIcons() {
 912         // Get a long array of the selected bookmarks.
 913         long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
 914
 915         // Get the database IDs for the first, last, and selected bookmarks.
 916         int selectedBookmarkDatabaseId = (int) selectedBookmarksLongArray[0];
 917         int firstBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(0);
 918         // bookmarksListView is 0 indexed.
 919         int lastBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(bookmarksListView.getCount() - 1);
 920
 921         // Update the move bookmark up `MenuItem`.
 922         if (selectedBookmarkDatabaseId == firstBookmarkDatabaseId) {  // The selected bookmark is in the first position.
 923             // Disable the move bookmark up `MenuItem`.
 924             moveBookmarkUpMenuItem.setEnabled(false);
 925
 926             //  Set the move bookmark up icon to be ghosted.
 927             moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_disabled);
 928         } else {  // The selected bookmark is not in the first position.
 929             // Enable the move bookmark up `MenuItem`.
 930             moveBookmarkUpMenuItem.setEnabled(true);
 931
 932             // Set the icon according to the theme.
 933             if (MainWebViewActivity.darkTheme) {
 934                 moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_enabled_dark);
 935             } else {
 936                 moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_enabled_light);
 937             }
 938         }
 939
 940         // Update the move bookmark down `MenuItem`.
 941         if (selectedBookmarkDatabaseId == lastBookmarkDatabaseId) {  // The selected bookmark is in the last position.
 942             // Disable the move bookmark down `MenuItem`.
 943             moveBookmarkDownMenuItem.setEnabled(false);
 944
 945             // Set the move bookmark down icon to be ghosted.
 946             moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_disabled);
 947         } else {  // The selected bookmark is not in the last position.
 948             // Enable the move bookmark down `MenuItem`.
 949             moveBookmarkDownMenuItem.setEnabled(true);
 950
 951             // Set the icon according to the theme.
 952             if (MainWebViewActivity.darkTheme) {
 953                 moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_enabled_dark);
 954             } else {
 955                 moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_enabled_light);
 956             }
 957         }
 958     }
 959
 960     private void scrollBookmarks(int selectedBookmarkPosition) {
 961         // Get the first and last visible bookmark positions.
 962         int firstVisibleBookmarkPosition = bookmarksListView.getFirstVisiblePosition();
 963         int lastVisibleBookmarkPosition = bookmarksListView.getLastVisiblePosition();
 964
 965         // Calculate the number of bookmarks per screen.
 966         int numberOfBookmarksPerScreen = lastVisibleBookmarkPosition - firstVisibleBookmarkPosition;
 967
 968         // Scroll with the moved bookmark if necessary.
 969         if (selectedBookmarkPosition <= firstVisibleBookmarkPosition) {  // The selected bookmark position is at or above the top of the screen.
 970             // Scroll to the selected bookmark position.
 971             bookmarksListView.setSelection(selectedBookmarkPosition);
 972         } else if (selectedBookmarkPosition >= (lastVisibleBookmarkPosition - 1)) {  // The selected bookmark is at or below the bottom of the screen.  The `-1` handles partial bookmarks displayed at the bottom of the `ListView`.
 973             // Scroll to display the selected bookmark at the bottom of the screen.  `+1` assured that the entire bookmark will be displayed in situations where only a partial bookmark fits at the bottom of the `ListView`.
 974             bookmarksListView.setSelection(selectedBookmarkPosition - numberOfBookmarksPerScreen + 1);
 975         }
 976     }
 977
 978     private void loadFolder() {
 979         // Update `bookmarksCursor` with the contents of the bookmarks database for the current folder.
 980         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 981
 982         // Setup a `CursorAdapter`.  `this` specifies the `Context`.  `false` disables `autoRequery`.
 983         bookmarksCursorAdapter = new CursorAdapter(this, bookmarksCursor, false) {
 984             @Override
 985             public View newView(Context context, Cursor cursor, ViewGroup parent) {
 986                 // Inflate the individual item layout.  `false` does not attach it to the root.
 987                 return getLayoutInflater().inflate(R.layout.bookmarks_activity_item_linearlayout, parent, false);
 988             }
 989
 990             @Override
 991             public void bindView(View view, Context context, Cursor cursor) {
 992                 // Get handles for the views.
 993                 ImageView bookmarkFavoriteIcon = view.findViewById(R.id.bookmark_favorite_icon);
 994                 TextView bookmarkNameTextView = view.findViewById(R.id.bookmark_name);
 995
 996                 // Get the favorite icon byte array from the `Cursor`.
 997                 byte[] favoriteIconByteArray = cursor.getBlob(cursor.getColumnIndex(BookmarksDatabaseHelper.FAVORITE_ICON));
 998
 999                 // Convert the byte array to a `Bitmap` beginning at the first byte and ending at the last.
1000                 Bitmap favoriteIconBitmap = BitmapFactory.decodeByteArray(favoriteIconByteArray, 0, favoriteIconByteArray.length);
1001
1002                 // Display the bitmap in `bookmarkFavoriteIcon`.
1003                 bookmarkFavoriteIcon.setImageBitmap(favoriteIconBitmap);
1004
1005                 // Get the bookmark name from the cursor and display it in `bookmarkNameTextView`.
1006                 String bookmarkNameString = cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
1007                 bookmarkNameTextView.setText(bookmarkNameString);
1008
1009                 // Make the font bold for folders.
1010                 if (cursor.getInt(cursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1) {
1011                     bookmarkNameTextView.setTypeface(Typeface.DEFAULT_BOLD);
1012                 } else {  // Reset the font to default for normal bookmarks.
1013                     bookmarkNameTextView.setTypeface(Typeface.DEFAULT);
1014                 }
1015             }
1016         };
1017
1018         // Populate the `ListView` with the adapter.
1019         bookmarksListView.setAdapter(bookmarksCursorAdapter);
1020
1021         // Set the `AppBar` title.
1022         if (currentFolder.isEmpty()) {
1023             appBar.setTitle(R.string.bookmarks);
1024         } else {
1025             appBar.setTitle(currentFolder);
1026         }
1027     }
1028
1029     @Override
1030     public void onDestroy() {
1031         // Close the bookmarks cursor and database.
1032         bookmarksCursor.close();
1033         bookmarksDatabaseHelper.close();
1034
1035         // Run the default commands.
1036         super.onDestroy();
1037     }
1038 }