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