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,
  65         EditBookmarkFolderDialog.EditBookmarkFolderListener, MoveToFolderDialog.MoveToFolderListener {
  66
  67     // `bookmarksDatabaseHelper` is public static so it can be accessed from `MoveToFolderDialog`.  It is also used in `onCreate()`, `onOptionsItemSelected()`, `onBackPressed()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveEditBookmark()`,
  68     // `onSaveEditBookmarkFolder()`, `onMoveToFolder()`, `deleteBookmarkFolderContents()`, and `loadFolder().
  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()`, `onBackPressed()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()`, `onMoveToFolder()`, and `loadFolder()`.
  73     public static String currentFolder;
  74
  75     // `checkedItemIds` is public static so it can be accessed from `MoveToFolderDialog`.  It is also used in `onCreate()`, `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()`, `onMoveToFolder()`, and `updateMoveIcons()`.
  76     public static long[] checkedItemIds;
  77
  78
  79     // `bookmarksListView` is used in `onCreate()`, `onOptionsItemSelected()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()`, `onMoveToFolder()`, `updateMoveIcons()`, `scrollBookmarks()`,
  80     // and `loadFolder()`.
  81     private ListView bookmarksListView;
  82
  83     // `bookmarksCursor` is used in `onCreate()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()`, `onMoveToFolder()`, `deleteBookmarkFolderContents()`, and `loadFolder()`.
  84     private Cursor bookmarksCursor;
  85
  86     // `bookmarksCursorAdapter` is used in `onCreate(), `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()`, `onMoveToFolder()`, and `onLoadFolder()`.
  87     private CursorAdapter bookmarksCursorAdapter;
  88
  89     // `contextualActionMode` is used in `onCreate()`, `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()` and `onMoveToFolder()`.
  90     private ActionMode contextualActionMode;
  91
  92     // `appBar` is used in `onCreate()` and `loadFolder()`.
  93     private ActionBar appBar;
  94
  95     // `oldFolderName` is used in `onCreate()` and `onSaveEditBookmarkFolder()`.
  96     private String oldFolderNameString;
  97
  98     // `moveBookmarkUpMenuItem` is used in `onCreate()` and `updateMoveIcons`.
  99     private MenuItem moveBookmarkUpMenuItem;
 100
 101     // `moveBookmarkDownMenuItem` is used in `onCreate()` and `updateMoveIcons`.
 102     private MenuItem moveBookmarkDownMenuItem;
 103
 104     @Override
 105     protected void onCreate(Bundle savedInstanceState) {
 106         // Set the activity theme.
 107         if (MainWebViewActivity.darkTheme) {
 108             setTheme(R.style.PrivacyBrowserDark_SecondaryActivity);
 109         } else {
 110             setTheme(R.style.PrivacyBrowserLight_SecondaryActivity);
 111         }
 112
 113         // Run the default commands.
 114         super.onCreate(savedInstanceState);
 115
 116         // Get the intent that launched the activity.
 117         Intent launchingIntent = getIntent();
 118
 119         // Get the current folder from the `Intent`.
 120         currentFolder = launchingIntent.getStringExtra("Current Folder");
 121
 122         // Set the content view.
 123         setContentView(R.layout.bookmarks_coordinatorlayout);
 124
 125         // Use the `SupportActionBar` from `android.support.v7.app.ActionBar` until the minimum API is >= 21.
 126         final Toolbar bookmarksAppBar = (Toolbar) findViewById(R.id.bookmarks_toolbar);
 127         setSupportActionBar(bookmarksAppBar);
 128
 129         // Get a handle for the activity, the app bar, and the `ListView`.
 130         final Activity bookmarksActivity = this;
 131         appBar = getSupportActionBar();
 132         bookmarksListView = (ListView) findViewById(R.id.bookmarks_listview);
 133
 134         // This assert removes the incorrect warning in Android Studio on the following line that `appBar` might be null.
 135         assert appBar != null;
 136
 137         // Display the home arrow on `SupportActionBar`.
 138         appBar.setDisplayHomeAsUpEnabled(true);
 139
 140         // Initialize the database helper.  `this` specifies the context.  The two `nulls` do not specify the database name or a `CursorFactory`.
 141         // The `0` specifies a database version, but that is ignored and set instead using a constant in `BookmarksDatabaseHelper`.
 142         bookmarksDatabaseHelper = new BookmarksDatabaseHelper(this, null, null, 0);
 143
 144         // Load the home folder.
 145         loadFolder();
 146
 147         // Set a listener so that tapping a list item loads the URL or folder.
 148         bookmarksListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
 149             @Override
 150             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
 151                 // Convert the id from long to int to match the format of the bookmarks database.
 152                 int databaseID = (int) id;
 153
 154                 // Get the bookmark `Cursor` for this ID and move it to the first row.
 155                 Cursor bookmarkCursor = bookmarksDatabaseHelper.getBookmarkCursor(databaseID);
 156                 bookmarkCursor.moveToFirst();
 157
 158                 // Act upon the bookmark according to the type.
 159                 if (bookmarkCursor.getInt(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1) {  // The selected bookmark is a folder.
 160                     // Update `currentFolder`.
 161                     currentFolder = bookmarkCursor.getString(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 162
 163                     // Load the new folder.
 164                     loadFolder();
 165                 } else {  // The selected bookmark is not a folder.
 166                     // Get the bookmark URL and assign it to `formattedUrlString`.  `mainWebView` will automatically reload when `BookmarksActivity` closes.
 167                     MainWebViewActivity.formattedUrlString = bookmarkCursor.getString(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_URL));
 168
 169                     // Update the bookmarks folder for the bookmarks drawer in `MainWebViewActivity`.
 170                     MainWebViewActivity.currentBookmarksFolder = currentFolder;
 171
 172                     // Close the bookmarks drawer and reload the bookmarks `ListView` when returning to `MainWebViewActivity`.
 173                     MainWebViewActivity.restartFromBookmarksActivity = true;
 174
 175                     // Return to `MainWebViewActivity`.
 176                     NavUtils.navigateUpFromSameTask(bookmarksActivity);
 177                 }
 178
 179                 // Close the `Cursor`.
 180                 bookmarkCursor.close();
 181             }
 182         });
 183
 184         // `MultiChoiceModeListener` handles long clicks.
 185         bookmarksListView.setMultiChoiceModeListener(new AbsListView.MultiChoiceModeListener() {
 186             // Instantiate the common variables.
 187             MenuItem editBookmarkMenuItem;
 188             MenuItem deleteBookmarksMenuItem;
 189             MenuItem selectAllBookmarksMenuItem;
 190             boolean deletingBookmarks;
 191
 192             @Override
 193             public boolean onCreateActionMode(ActionMode mode, Menu menu) {
 194                 // Inflate the menu for the contextual app bar and set the title.
 195                 getMenuInflater().inflate(R.menu.bookmarks_context_menu, menu);
 196
 197                 // Set the title.
 198                 if (currentFolder.isEmpty()) {
 199                     // Use `R.string.bookmarks` if we are in the home folder.
 200                     mode.setTitle(R.string.bookmarks);
 201                 } else {  // Use the current folder name as the title.
 202                     mode.setTitle(currentFolder);
 203                 }
 204
 205                 // Get a handle for `MenuItems` that need to be selectively disabled.
 206                 moveBookmarkUpMenuItem = menu.findItem(R.id.move_bookmark_up);
 207                 moveBookmarkDownMenuItem = menu.findItem(R.id.move_bookmark_down);
 208                 editBookmarkMenuItem = menu.findItem(R.id.edit_bookmark);
 209                 deleteBookmarksMenuItem = menu.findItem(R.id.delete_bookmark);
 210                 selectAllBookmarksMenuItem = menu.findItem(R.id.context_menu_select_all_bookmarks);
 211
 212                 // Disable the delete bookmarks menu item if a delete is pending.
 213                 if (deletingBookmarks) {
 214                     deleteBookmarksMenuItem.setEnabled(false);
 215                 }
 216
 217                 // Store `contextualActionMode` so it can be closed programatically.
 218                 contextualActionMode = mode;
 219
 220                 // Make it so.
 221                 return true;
 222             }
 223
 224             @Override
 225             public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
 226                 // Get a handle for the move to folder menu item.
 227                 MenuItem moveToFolderMenuItem = menu.findItem(R.id.move_to_folder);
 228
 229                 // Get a `Cursor` with all of the folders.
 230                 Cursor folderCursor = bookmarksDatabaseHelper.getAllFoldersCursor();
 231
 232                 // Enable the move to folder menu item if at least one folder exists.
 233                 moveToFolderMenuItem.setVisible(folderCursor.getCount() > 0);
 234
 235                 // Make it so.
 236                 return true;
 237             }
 238
 239             @Override
 240             public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
 241                 // Get a long array of the selected bookmarks.
 242                 long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
 243
 244                 // Calculate the number of selected bookmarks.
 245                 int numberOfSelectedBookmarks = selectedBookmarksLongArray.length;
 246
 247                 // Adjust the `ActionMode` and the `Menu` according to the number of selected bookmarks.
 248                 if (numberOfSelectedBookmarks == 0) {  // No bookmarks are selected.
 249                     // Close the `ActionMode`.
 250                     mode.finish();
 251                 } else if (numberOfSelectedBookmarks == 1) {  // One bookmark is selected.
 252                     // List the number of selected bookmarks in the subtitle.
 253                     mode.setSubtitle(getString(R.string.one_selected));
 254
 255                     // Show the `Move Up`, `Move Down`, and  `Edit` options.
 256                     moveBookmarkUpMenuItem.setVisible(true);
 257                     moveBookmarkDownMenuItem.setVisible(true);
 258                     editBookmarkMenuItem.setVisible(true);
 259
 260                     // Update the enabled status of the move icons.
 261                     updateMoveIcons();
 262                 } else {  // More than one bookmark is selected.
 263                     // List the number of selected bookmarks in the subtitle.
 264                     mode.setSubtitle(numberOfSelectedBookmarks + " " + getString(R.string.selected));
 265
 266                     // Hide non-applicable `MenuItems`.
 267                     moveBookmarkUpMenuItem.setVisible(false);
 268                     moveBookmarkDownMenuItem.setVisible(false);
 269                     editBookmarkMenuItem.setVisible(false);
 270                 }
 271
 272                 // Do not show `Select All` if all the bookmarks are already checked.
 273                 if (bookmarksListView.getCheckedItemIds().length == bookmarksListView.getCount()) {
 274                     selectAllBookmarksMenuItem.setVisible(false);
 275                 } else {
 276                     selectAllBookmarksMenuItem.setVisible(true);
 277                 }
 278             }
 279
 280             @Override
 281             public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
 282                 // Get the menu item ID.
 283                 int menuItemId = item.getItemId();
 284
 285                 // Instantiate the common variables.
 286                 int selectedBookmarkPosition;
 287                 int selectedBookmarkNewPosition;
 288                 final SparseBooleanArray selectedBookmarksPositionsSparseBooleanArray;
 289
 290                 switch (menuItemId) {
 291                     case R.id.move_bookmark_up:
 292                         // Get the array of checked bookmark positions.
 293                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
 294
 295                         // Store the position of the selected bookmark.  Only one bookmark is selected when `move_bookmark_up` is enabled.
 296                         selectedBookmarkPosition = selectedBookmarksPositionsSparseBooleanArray.keyAt(0);
 297
 298                         // Calculate the new position of the selected bookmark.
 299                         selectedBookmarkNewPosition = selectedBookmarkPosition - 1;
 300
 301                         // Iterate through the bookmarks.
 302                         for (int i = 0; i < bookmarksListView.getCount(); i++) {
 303                             // Get the database ID for the current bookmark.
 304                             int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 305
 306                             // Update the display order for the current bookmark.
 307                             if (i == selectedBookmarkPosition) {  // The current bookmark is the selected bookmark.
 308                                 // Move the current bookmark up one.
 309                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i - 1);
 310                             } else if ((i + 1) == selectedBookmarkPosition){  // The current bookmark is immediately above the selected bookmark.
 311                                 // Move the current bookmark down one.
 312                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i + 1);
 313                             } else {  // The current bookmark is not changing positions.
 314                                 // Move `bookmarksCursor` to the current bookmark position.
 315                                 bookmarksCursor.moveToPosition(i);
 316
 317                                 // Update the display order only if it is not correct in the database.
 318                                 if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
 319                                     bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
 320                                 }
 321                             }
 322                         }
 323
 324                         // Update `bookmarksCursor` with the current contents of the bookmarks database.
 325                         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 326
 327                         // Update the `ListView`.
 328                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 329
 330                         // Scroll with the bookmark.
 331                         scrollBookmarks(selectedBookmarkNewPosition);
 332
 333                         // Update the enabled status of the move icons.
 334                         updateMoveIcons();
 335                         break;
 336
 337                     case R.id.move_bookmark_down:
 338                         // Get the array of checked bookmark positions.
 339                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
 340
 341                         // Store the position of the selected bookmark.  Only one bookmark is selected when `move_bookmark_down` is enabled.
 342                         selectedBookmarkPosition = selectedBookmarksPositionsSparseBooleanArray.keyAt(0);
 343
 344                         // Calculate the new position of the selected bookmark.
 345                         selectedBookmarkNewPosition = selectedBookmarkPosition + 1;
 346
 347                         // Iterate through the bookmarks.
 348                         for (int i = 0; i <bookmarksListView.getCount(); i++) {
 349                             // Get the database ID for the current bookmark.
 350                             int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 351
 352                             // Update the display order for the current bookmark.
 353                             if (i == selectedBookmarkPosition) {  // The current bookmark is the selected bookmark.
 354                                 // Move the current bookmark down one.
 355                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i + 1);
 356                             } else if ((i - 1) == selectedBookmarkPosition) {  // The current bookmark is immediately below the selected bookmark.
 357                                 // Move the bookmark below the selected bookmark up one.
 358                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i - 1);
 359                             } else {  // The current bookmark is not changing positions.
 360                                 // Move `bookmarksCursor` to the current bookmark position.
 361                                 bookmarksCursor.moveToPosition(i);
 362
 363                                 // Update the display order only if it is not correct in the database.
 364                                 if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
 365                                     bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
 366                                 }
 367                             }
 368                         }
 369
 370                         // Update `bookmarksCursor` with the current contents of the bookmarks database.
 371                         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 372
 373                         // Update the `ListView`.
 374                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 375
 376                         // Scroll with the bookmark.
 377                         scrollBookmarks(selectedBookmarkNewPosition);
 378
 379                         // Update the enabled status of the move icons.
 380                         updateMoveIcons();
 381                         break;
 382
 383                     case R.id.move_to_folder:
 384                         // Store `checkedItemIds` for use by the `AlertDialog`.
 385                         checkedItemIds = bookmarksListView.getCheckedItemIds();
 386
 387                         // Show the `MoveToFolderDialog` `AlertDialog` and name the instance `@string/move_to_folder
 388                         AppCompatDialogFragment moveToFolderDialog = new MoveToFolderDialog();
 389                         moveToFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.move_to_folder));
 390                         break;
 391
 392                     case R.id.edit_bookmark:
 393                         // Get the array of checked bookmark positions.
 394                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
 395
 396                         // Get the position of the selected bookmark.  Only one bookmark is selected when `edit_bookmark_down` is enabled.
 397                         selectedBookmarkPosition = selectedBookmarksPositionsSparseBooleanArray.keyAt(0);
 398
 399                         // Move to the selected position and find out if it is a folder.
 400                         bookmarksCursor.moveToPosition(selectedBookmarkPosition);
 401                         boolean isFolder = (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1);
 402
 403                         // Get the selected bookmark database ID.
 404                         int databaseId = bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper._ID));
 405
 406                         if (isFolder) {
 407                             // Save the current folder name, which is used in `onSaveEditBookmarkFolder()`.
 408                             oldFolderNameString = bookmarksCursor.getString(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 409
 410                             // Show the edit bookmark folder `AlertDialog` and name the instance `@string/edit_folder`.
 411                             AppCompatDialogFragment editFolderDialog = EditBookmarkFolderDialog.folderDatabaseId(databaseId);
 412                             editFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_folder));
 413                         } else {
 414                             // Show the edit bookmark `AlertDialog` and name the instance `@string/edit_bookmark`.
 415                             AppCompatDialogFragment editBookmarkDialog = EditBookmarkDialog.bookmarkDatabaseId(databaseId);
 416                             editBookmarkDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_bookmark));
 417                         }
 418                         break;
 419
 420                     case R.id.delete_bookmark:
 421                         // Set the deleting bookmarks flag, which prevents the delete menu item from being enabled until the current process finishes.
 422                         deletingBookmarks = true;
 423
 424                         // Get an array of the selected row IDs.
 425                         final long[] selectedBookmarksIdsLongArray = bookmarksListView.getCheckedItemIds();
 426
 427                         // 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.
 428                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions().clone();
 429
 430                         // Update `bookmarksCursor` with the current contents of the bookmarks database except for the specified database IDs.
 431                         bookmarksCursor = bookmarksDatabaseHelper.getBookmarksCursorExcept(selectedBookmarksIdsLongArray, currentFolder);
 432
 433                         // Update the `ListView`.
 434                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 435
 436                         // Instantiate `snackbarMessage`.
 437                         String snackbarMessage;
 438
 439                         // Determine how many items are in the array and prepare an appropriate `Snackbar` message.
 440                         if (selectedBookmarksIdsLongArray.length == 1) {
 441                             snackbarMessage = getString(R.string.one_bookmark_deleted);
 442                         } else {
 443                             snackbarMessage = selectedBookmarksIdsLongArray.length + " " + getString(R.string.bookmarks_deleted);
 444                         }
 445
 446                         // Show a SnackBar.
 447                         Snackbar.make(findViewById(R.id.bookmarks_coordinatorlayout), snackbarMessage, Snackbar.LENGTH_LONG)
 448                                 .setAction(R.string.undo, new View.OnClickListener() {
 449                                     @Override
 450                                     public void onClick(View view) {
 451                                         // Do nothing because everything will be handled by `onDismissed()` below.
 452                                     }
 453                                 })
 454                                 .addCallback(new Snackbar.Callback() {
 455                                     @Override
 456                                     public void onDismissed(Snackbar snackbar, int event) {
 457                                         switch (event) {
 458                                             // The user pushed the `Undo` button.
 459                                             case Snackbar.Callback.DISMISS_EVENT_ACTION:
 460                                                 // Update `bookmarksCursor` with the current contents of the bookmarks database, including the "deleted" bookmarks.
 461                                                 bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 462
 463                                                 // Update the `ListView`.
 464                                                 bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 465
 466                                                 // Re-select the previously selected bookmarks.
 467                                                 for (int i = 0; i < selectedBookmarksPositionsSparseBooleanArray.size(); i++) {
 468                                                     bookmarksListView.setItemChecked(selectedBookmarksPositionsSparseBooleanArray.keyAt(i), true);
 469                                                 }
 470
 471                                                 break;
 472
 473                                             // The `Snackbar` was dismissed without the `Undo` button being pushed.
 474                                             default:
 475                                                 // Delete each selected bookmark.
 476                                                 for (long databaseIdLong : selectedBookmarksIdsLongArray) {
 477                                                     // Convert `databaseIdLong` to an int.
 478                                                     int databaseIdInt = (int) databaseIdLong;
 479
 480                                                     // Delete the contents of the folder if the selected bookmark is a folder.
 481                                                     if (bookmarksDatabaseHelper.isFolder(databaseIdInt)) {
 482                                                         deleteBookmarkFolderContents(databaseIdInt);
 483                                                     }
 484
 485                                                     // Delete the selected bookmark.
 486                                                     bookmarksDatabaseHelper.deleteBookmark(databaseIdInt);
 487                                                 }
 488
 489                                                 // Update the display order.
 490                                                 for (int i = 0; i < bookmarksListView.getCount(); i++) {
 491                                                     // Get the database ID for the current bookmark.
 492                                                     int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 493
 494                                                     // Move `bookmarksCursor` to the current bookmark position.
 495                                                     bookmarksCursor.moveToPosition(i);
 496
 497                                                     // Update the display order only if it is not correct in the database.
 498                                                     if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
 499                                                         bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
 500                                                     }
 501                                                 }
 502                                         }
 503
 504                                         // Enable the delete bookmarks menu item.
 505                                         deleteBookmarksMenuItem.setEnabled(true);
 506
 507                                         // Reset the deleting bookmarks flag.
 508                                         deletingBookmarks = false;
 509                                     }
 510                                 })
 511                                 //Show the `SnackBar`.
 512                                 .show();
 513
 514                         // Close the `ActionBar`.
 515                         mode.finish();
 516                         break;
 517
 518                     case R.id.context_menu_select_all_bookmarks:
 519                         // Get the total number of bookmarks.
 520                         int numberOfBookmarks = bookmarksListView.getCount();
 521
 522                         // Select them all.
 523                         for (int i = 0; i < numberOfBookmarks; i++) {
 524                             bookmarksListView.setItemChecked(i, true);
 525                         }
 526                         break;
 527                 }
 528
 529                 // Consume the click.
 530                 return true;
 531             }
 532
 533             @Override
 534             public void onDestroyActionMode(ActionMode mode) {
 535                 // Do nothing.
 536             }
 537         });
 538
 539         // Get handles for the `FloatingActionButtons`.
 540         FloatingActionButton createBookmarkFolderFab = (FloatingActionButton) findViewById(R.id.create_bookmark_folder_fab);
 541         FloatingActionButton createBookmarkFab = (FloatingActionButton) findViewById(R.id.create_bookmark_fab);
 542
 543         // Set the create new bookmark folder FAB to display the `AlertDialog`.
 544         createBookmarkFolderFab.setOnClickListener(new View.OnClickListener() {
 545             @Override
 546             public void onClick(View v) {
 547                 // Show the `CreateBookmarkFolderDialog` `AlertDialog` and name the instance `@string/create_folder`.
 548                 AppCompatDialogFragment createBookmarkFolderDialog = new CreateBookmarkFolderDialog();
 549                 createBookmarkFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.create_folder));
 550             }
 551         });
 552
 553         // Set the create new bookmark FAB to display the `AlertDialog`.
 554         createBookmarkFab.setOnClickListener(new View.OnClickListener() {
 555             @Override
 556             public void onClick(View view) {
 557                 // Show the `CreateBookmarkDialog` `AlertDialog` and name the instance `@string/create_bookmark`.
 558                 AppCompatDialogFragment createBookmarkDialog = new CreateBookmarkDialog();
 559                 createBookmarkDialog.show(getSupportFragmentManager(), getResources().getString(R.string.create_bookmark));
 560             }
 561         });
 562     }
 563
 564     @Override
 565     public boolean onCreateOptionsMenu(Menu menu) {
 566         // Inflate the menu.
 567         getMenuInflater().inflate(R.menu.bookmarks_options_menu, menu);
 568
 569         // Success.
 570         return true;
 571     }
 572
 573     @Override
 574     public boolean onOptionsItemSelected(MenuItem menuItem) {
 575         // Get the ID of the `MenuItem` that was selected.
 576         int menuItemId = menuItem.getItemId();
 577
 578         switch (menuItemId) {
 579             case android.R.id.home:  // The home arrow is identified as `android.R.id.home`, not just `R.id.home`.
 580                 if (currentFolder.isEmpty()) {  // Currently in the home folder.
 581                     // Update the bookmarks folder for the bookmarks drawer in `MainWebViewActivity`.
 582                     MainWebViewActivity.currentBookmarksFolder = "";
 583
 584                     // Close the bookmarks drawer and reload the bookmarks `ListView` when returning to `MainWebViewActivity`.
 585                     MainWebViewActivity.restartFromBookmarksActivity = true;
 586
 587                     // Return to `MainWebViewActivity`.
 588                     NavUtils.navigateUpFromSameTask(this);
 589                 } else {  // Currently in a subfolder.
 590                     // Place the former parent folder in `currentFolder`.
 591                     currentFolder = bookmarksDatabaseHelper.getParentFolder(currentFolder);
 592
 593                     // Load the new folder.
 594                     loadFolder();
 595                 }
 596                 break;
 597
 598             case R.id.options_menu_select_all_bookmarks:
 599                 // Get the total number of bookmarks.
 600                 int numberOfBookmarks = bookmarksListView.getCount();
 601
 602                 // Select them all.
 603                 for (int i = 0; i < numberOfBookmarks; i++) {
 604                     bookmarksListView.setItemChecked(i, true);
 605                 }
 606                 break;
 607
 608             case R.id.bookmarks_database_view:
 609                 // Launch `BookmarksDatabaseViewActivity`.
 610                 Intent bookmarksDatabaseViewIntent = new Intent(this, BookmarksDatabaseViewActivity.class);
 611                 startActivity(bookmarksDatabaseViewIntent);
 612                 break;
 613         }
 614         return true;
 615     }
 616
 617     @Override
 618     public void onBackPressed() {
 619         if (currentFolder.isEmpty()) {  // Currently in the home folder.
 620             // Update the bookmarks folder for the bookmarks drawer in `MainWebViewActivity`.
 621             MainWebViewActivity.currentBookmarksFolder = "";
 622
 623             // Close the bookmarks drawer and reload the bookmarks `ListView` when returning to `MainWebViewActivity`.
 624             MainWebViewActivity.restartFromBookmarksActivity = true;
 625
 626             // Exit `BookmarksActivity`.
 627             super.onBackPressed();
 628         } else {  // Currently in a subfolder.
 629             // Place the former parent folder in `currentFolder`.
 630             currentFolder = bookmarksDatabaseHelper.getParentFolder(currentFolder);
 631
 632             // Load the new folder.
 633             loadFolder();
 634         }
 635     }
 636
 637     @Override
 638     public void onCreateBookmark(AppCompatDialogFragment dialogFragment) {
 639         // Get the `EditTexts` from the `dialogFragment`.
 640         EditText createBookmarkNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.create_bookmark_name_edittext);
 641         EditText createBookmarkUrlEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.create_bookmark_url_edittext);
 642
 643         // Extract the strings from the `EditTexts`.
 644         String bookmarkNameString = createBookmarkNameEditText.getText().toString();
 645         String bookmarkUrlString = createBookmarkUrlEditText.getText().toString();
 646
 647         // Convert the favoriteIcon Bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
 648         ByteArrayOutputStream favoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
 649         MainWebViewActivity.favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, favoriteIconByteArrayOutputStream);
 650         byte[] favoriteIconByteArray = favoriteIconByteArrayOutputStream.toByteArray();
 651
 652         // Display the new bookmark below the current items in the (0 indexed) list.
 653         int newBookmarkDisplayOrder = bookmarksListView.getCount();
 654
 655         // Create the bookmark.
 656         bookmarksDatabaseHelper.createBookmark(bookmarkNameString, bookmarkUrlString, newBookmarkDisplayOrder, currentFolder, favoriteIconByteArray);
 657
 658         // Update `bookmarksCursor` with the current contents of this folder.
 659         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 660
 661         // Update the `ListView`.
 662         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 663
 664         // Scroll to the new bookmark.
 665         bookmarksListView.setSelection(newBookmarkDisplayOrder);
 666     }
 667
 668     @Override
 669     public void onCreateBookmarkFolder(AppCompatDialogFragment dialogFragment) {
 670         // Get handles for the views in `dialogFragment`.
 671         EditText createFolderNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.create_folder_name_edittext);
 672         RadioButton defaultFolderIconRadioButton = (RadioButton) dialogFragment.getDialog().findViewById(R.id.create_folder_default_icon_radiobutton);
 673         ImageView folderIconImageView = (ImageView) dialogFragment.getDialog().findViewById(R.id.create_folder_default_icon);
 674
 675         // Get new folder name string.
 676         String folderNameString = createFolderNameEditText.getText().toString();
 677
 678         // Get the new folder icon `Bitmap`.
 679         Bitmap folderIconBitmap;
 680         if (defaultFolderIconRadioButton.isChecked()) {  // Use the default folder icon.
 681             // Get the default folder icon and convert it to a `Bitmap`.
 682             Drawable folderIconDrawable = folderIconImageView.getDrawable();
 683             BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 684             folderIconBitmap = folderIconBitmapDrawable.getBitmap();
 685         } else {  // Use the `WebView` favorite icon.
 686             folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 687         }
 688
 689         // Convert `folderIconBitmap` to a byte array.  `0` is for lossless compression (the only option for a PNG).
 690         ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
 691         folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
 692         byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
 693
 694         // Move all the bookmarks down one in the display order.
 695         for (int i = 0; i < bookmarksListView.getCount(); i++) {
 696             int databaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 697             bookmarksDatabaseHelper.updateDisplayOrder(databaseId, i + 1);
 698         }
 699
 700         // Create the folder, placing it at the top of the ListView
 701         bookmarksDatabaseHelper.createFolder(folderNameString, 0, currentFolder, folderIconByteArray);
 702
 703         // Update `bookmarksCursor` with the current contents of this folder.
 704         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 705
 706         // Update the `ListView`.
 707         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 708
 709         // Scroll to the new folder.
 710         bookmarksListView.setSelection(0);
 711     }
 712
 713     @Override
 714     public void onSaveEditBookmark(AppCompatDialogFragment dialogFragment, int selectedBookmarkDatabaseId) {
 715         // Get handles for the views from `dialogFragment`.
 716         EditText editBookmarkNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.edit_bookmark_name_edittext);
 717         EditText editBookmarkUrlEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.edit_bookmark_url_edittext);
 718         RadioButton currentBookmarkIconRadioButton = (RadioButton) dialogFragment.getDialog().findViewById(R.id.edit_bookmark_current_icon_radiobutton);
 719
 720         // Store the bookmark strings.
 721         String bookmarkNameString = editBookmarkNameEditText.getText().toString();
 722         String bookmarkUrlString = editBookmarkUrlEditText.getText().toString();
 723
 724         // Update the bookmark.
 725         if (currentBookmarkIconRadioButton.isChecked()) {  // Update the bookmark without changing the favorite icon.
 726             bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString);
 727         } else {  // Update the bookmark using the `WebView` favorite icon.
 728             // Convert the favorite icon to a byte array.  `0` is for lossless compression (the only option for a PNG).
 729             ByteArrayOutputStream newFavoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
 730             MainWebViewActivity.favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFavoriteIconByteArrayOutputStream);
 731             byte[] newFavoriteIconByteArray = newFavoriteIconByteArrayOutputStream.toByteArray();
 732
 733             //  Update the bookmark and the favorite icon.
 734             bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString, newFavoriteIconByteArray);
 735         }
 736
 737         // Close the contextual action mode.
 738         contextualActionMode.finish();
 739
 740         // Update `bookmarksCursor` with the current contents of this folder.
 741         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 742
 743         // Update the `ListView`.
 744         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 745     }
 746
 747     @Override
 748     public void onSaveEditBookmarkFolder(AppCompatDialogFragment dialogFragment, int selectedFolderDatabaseId) {
 749         // Get handles for the views from `dialogFragment`.
 750         EditText editFolderNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.edit_folder_name_edittext);
 751         RadioButton currentFolderIconRadioButton = (RadioButton) dialogFragment.getDialog().findViewById(R.id.edit_folder_current_icon_radiobutton);
 752         RadioButton defaultFolderIconRadioButton = (RadioButton) dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon_radiobutton);
 753         ImageView folderIconImageView = (ImageView) dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon);
 754
 755         // Get the new folder name.
 756         String newFolderNameString = editFolderNameEditText.getText().toString();
 757
 758         // Check if the favorite icon has changed.
 759         if (currentFolderIconRadioButton.isChecked()) {  // Only the name has changed.
 760             // Update the name in the database.
 761             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, oldFolderNameString, newFolderNameString);
 762         } else if (!currentFolderIconRadioButton.isChecked() && newFolderNameString.equals(oldFolderNameString)) {  // Only the icon has changed.
 763             // Get the new folder icon `Bitmap`.
 764             Bitmap folderIconBitmap;
 765             if (defaultFolderIconRadioButton.isChecked()) {
 766                 // Get the default folder icon and convert it to a `Bitmap`.
 767                 Drawable folderIconDrawable = folderIconImageView.getDrawable();
 768                 BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 769                 folderIconBitmap = folderIconBitmapDrawable.getBitmap();
 770             } else {  // Use the `WebView` favorite icon.
 771                 folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 772             }
 773
 774             // Convert the folder `Bitmap` to a byte array.  `0` is for lossless compression (the only option for a PNG).
 775             ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
 776             folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
 777             byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
 778
 779             // Update the folder icon in the database.
 780             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, folderIconByteArray);
 781         } else {  // The folder icon and the name have changed.
 782             // Get the new folder icon `Bitmap`.
 783             Bitmap folderIconBitmap;
 784             if (defaultFolderIconRadioButton.isChecked()) {
 785                 // Get the default folder icon and convert it to a `Bitmap`.
 786                 Drawable folderIconDrawable = folderIconImageView.getDrawable();
 787                 BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 788                 folderIconBitmap = folderIconBitmapDrawable.getBitmap();
 789             } else {  // Use the `WebView` favorite icon.
 790                 folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 791             }
 792
 793             // Convert the folder `Bitmap` to a byte array.  `0` is for lossless compression (the only option for a PNG).
 794             ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
 795             folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
 796             byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
 797
 798             // Update the folder name and icon in the database.
 799             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, oldFolderNameString, newFolderNameString, folderIconByteArray);
 800         }
 801
 802         // Update `bookmarksCursor` with the current contents of this folder.
 803         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 804
 805         // Update the `ListView`.
 806         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 807
 808         // Close the contextual action mode.
 809         contextualActionMode.finish();
 810     }
 811
 812     @Override
 813     public void onMoveToFolder(AppCompatDialogFragment dialogFragment) {
 814         // Get a handle for the `ListView` from `dialogFragment`.
 815         ListView folderListView = (ListView) dialogFragment.getDialog().findViewById(R.id.move_to_folder_listview);
 816
 817         // Store a long array of the selected folders.
 818         long[] newFolderLongArray = folderListView.getCheckedItemIds();
 819
 820         // Get the new folder database ID.  Only one folder will be selected.
 821         int newFolderDatabaseId = (int) newFolderLongArray[0];
 822
 823         // Instantiate `newFolderName`.
 824         String newFolderName;
 825
 826         // Set the new folder name.
 827         if (newFolderDatabaseId == 0) {
 828             // The new folder is the home folder, represented as `""` in the database.
 829             newFolderName = "";
 830         } else {
 831             // Get the new folder name from the database.
 832             newFolderName = bookmarksDatabaseHelper.getFolderName(newFolderDatabaseId);
 833         }
 834
 835         // Get a long array with the the database ID of the selected bookmarks.
 836         long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
 837
 838         // Move each of the selected bookmarks to the new folder.
 839         for (long databaseIdLong : selectedBookmarksLongArray) {
 840             // Get `databaseIdInt` for each selected bookmark.
 841             int databaseIdInt = (int) databaseIdLong;
 842
 843             // Move the selected bookmark to the new folder.
 844             bookmarksDatabaseHelper.moveToFolder(databaseIdInt, newFolderName);
 845         }
 846
 847         // Update `bookmarksCursor` with the current contents of this folder.
 848         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 849
 850         // Update the `ListView`.
 851         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 852
 853         // Close the contextual app bar.
 854         contextualActionMode.finish();
 855     }
 856
 857     private void deleteBookmarkFolderContents(int databaseId) {
 858         // Get the name of the folder.
 859         String folderName = bookmarksDatabaseHelper.getFolderName(databaseId);
 860
 861         // Get the contents of the folder.
 862         Cursor folderCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(folderName);
 863
 864         // Delete each of the bookmarks in the folder.
 865         for (int i = 0; i < folderCursor.getCount(); i++) {
 866             // Move `folderCursor` to the current row.
 867             folderCursor.moveToPosition(i);
 868
 869             // Get the database ID of the item.
 870             int itemDatabaseId = folderCursor.getInt(folderCursor.getColumnIndex(BookmarksDatabaseHelper._ID));
 871
 872             // If this is a folder, recursively delete the contents first.
 873             if (bookmarksDatabaseHelper.isFolder(itemDatabaseId)) {
 874                 deleteBookmarkFolderContents(itemDatabaseId);
 875             }
 876
 877             // Delete the bookmark.
 878             bookmarksDatabaseHelper.deleteBookmark(itemDatabaseId);
 879         }
 880     }
 881
 882     private void updateMoveIcons() {
 883         // Get a long array of the selected bookmarks.
 884         long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
 885
 886         // Get the database IDs for the first, last, and selected bookmarks.
 887         int selectedBookmarkDatabaseId = (int) selectedBookmarksLongArray[0];
 888         int firstBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(0);
 889         // bookmarksListView is 0 indexed.
 890         int lastBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(bookmarksListView.getCount() - 1);
 891
 892         // Update the move bookmark up `MenuItem`.
 893         if (selectedBookmarkDatabaseId == firstBookmarkDatabaseId) {  // The selected bookmark is in the first position.
 894             // Disable the move bookmark up `MenuItem`.
 895             moveBookmarkUpMenuItem.setEnabled(false);
 896
 897             //  Set the move bookmark up icon to be ghosted.
 898             moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_disabled);
 899         } else {  // The selected bookmark is not in the first position.
 900             // Enable the move bookmark up `MenuItem`.
 901             moveBookmarkUpMenuItem.setEnabled(true);
 902
 903             // Set the icon according to the theme.
 904             if (MainWebViewActivity.darkTheme) {
 905                 moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_enabled_dark);
 906             } else {
 907                 moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_enabled_light);
 908             }
 909         }
 910
 911         // Update the move bookmark down `MenuItem`.
 912         if (selectedBookmarkDatabaseId == lastBookmarkDatabaseId) {  // The selected bookmark is in the last position.
 913             // Disable the move bookmark down `MenuItem`.
 914             moveBookmarkDownMenuItem.setEnabled(false);
 915
 916             // Set the move bookmark down icon to be ghosted.
 917             moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_disabled);
 918         } else {  // The selected bookmark is not in the last position.
 919             // Enable the move bookmark down `MenuItem`.
 920             moveBookmarkDownMenuItem.setEnabled(true);
 921
 922             // Set the icon according to the theme.
 923             if (MainWebViewActivity.darkTheme) {
 924                 moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_enabled_dark);
 925             } else {
 926                 moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_enabled_light);
 927             }
 928         }
 929     }
 930
 931     private void scrollBookmarks(int selectedBookmarkPosition) {
 932         // Get the first and last visible bookmark positions.
 933         int firstVisibleBookmarkPosition = bookmarksListView.getFirstVisiblePosition();
 934         int lastVisibleBookmarkPosition = bookmarksListView.getLastVisiblePosition();
 935
 936         // Calculate the number of bookmarks per screen.
 937         int numberOfBookmarksPerScreen = lastVisibleBookmarkPosition - firstVisibleBookmarkPosition;
 938
 939         // Scroll with the moved bookmark if necessary.
 940         if (selectedBookmarkPosition <= firstVisibleBookmarkPosition) {  // The selected bookmark position is at or above the top of the screen.
 941             // Scroll to the selected bookmark position.
 942             bookmarksListView.setSelection(selectedBookmarkPosition);
 943         } 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`.
 944             // 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`.
 945             bookmarksListView.setSelection(selectedBookmarkPosition - numberOfBookmarksPerScreen + 1);
 946         }
 947     }
 948
 949     private void loadFolder() {
 950         // Update `bookmarksCursor` with the contents of the bookmarks database for the current folder.
 951         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 952
 953         // Setup a `CursorAdapter`.  `this` specifies the `Context`.  `false` disables `autoRequery`.
 954         bookmarksCursorAdapter = new CursorAdapter(this, bookmarksCursor, false) {
 955             @Override
 956             public View newView(Context context, Cursor cursor, ViewGroup parent) {
 957                 // Inflate the individual item layout.  `false` does not attach it to the root.
 958                 return getLayoutInflater().inflate(R.layout.bookmarks_activity_item_linearlayout, parent, false);
 959             }
 960
 961             @Override
 962             public void bindView(View view, Context context, Cursor cursor) {
 963                 // Get handles for the views.
 964                 ImageView bookmarkFavoriteIcon = (ImageView) view.findViewById(R.id.bookmark_favorite_icon);
 965                 TextView bookmarkNameTextView = (TextView) view.findViewById(R.id.bookmark_name);
 966
 967                 // Get the favorite icon byte array from the `Cursor`.
 968                 byte[] favoriteIconByteArray = cursor.getBlob(cursor.getColumnIndex(BookmarksDatabaseHelper.FAVORITE_ICON));
 969
 970                 // Convert the byte array to a `Bitmap` beginning at the first byte and ending at the last.
 971                 Bitmap favoriteIconBitmap = BitmapFactory.decodeByteArray(favoriteIconByteArray, 0, favoriteIconByteArray.length);
 972
 973                 // Display the bitmap in `bookmarkFavoriteIcon`.
 974                 bookmarkFavoriteIcon.setImageBitmap(favoriteIconBitmap);
 975
 976                 // Get the bookmark name from the cursor and display it in `bookmarkNameTextView`.
 977                 String bookmarkNameString = cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 978                 bookmarkNameTextView.setText(bookmarkNameString);
 979
 980                 // Make the font bold for folders.
 981                 if (cursor.getInt(cursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1) {
 982                     bookmarkNameTextView.setTypeface(Typeface.DEFAULT_BOLD);
 983                 } else {  // Reset the font to default for normal bookmarks.
 984                     bookmarkNameTextView.setTypeface(Typeface.DEFAULT);
 985                 }
 986             }
 987         };
 988
 989         // Populate the `ListView` with the adapter.
 990         bookmarksListView.setAdapter(bookmarksCursorAdapter);
 991
 992         // Set the `AppBar` title.
 993         if (currentFolder.isEmpty()) {
 994             appBar.setTitle(R.string.bookmarks);
 995         } else {
 996             appBar.setTitle(currentFolder);
 997         }
 998     }
 999 }