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         // Set the current folder variable.
 120         if (launchingIntent.getStringExtra("Current Folder") != null) {  // Set the current folder from the intent.
 121             currentFolder = launchingIntent.getStringExtra("Current Folder");
 122         } else {  // Set the current folder to be `""`, which is the home folder.
 123             currentFolder = "";
 124         }
 125
 126         // Set the content view.
 127         setContentView(R.layout.bookmarks_coordinatorlayout);
 128
 129         // Use the `SupportActionBar` from `android.support.v7.app.ActionBar` until the minimum API is >= 21.
 130         final Toolbar bookmarksAppBar = (Toolbar) findViewById(R.id.bookmarks_toolbar);
 131         setSupportActionBar(bookmarksAppBar);
 132
 133         // Get a handle for the activity, the app bar, and the `ListView`.
 134         final Activity bookmarksActivity = this;
 135         appBar = getSupportActionBar();
 136         bookmarksListView = (ListView) findViewById(R.id.bookmarks_listview);
 137
 138         // This assert removes the incorrect warning in Android Studio on the following line that `appBar` might be null.
 139         assert appBar != null;
 140
 141         // Display the home arrow on `SupportActionBar`.
 142         appBar.setDisplayHomeAsUpEnabled(true);
 143
 144         // Initialize the database helper.  `this` specifies the context.  The two `nulls` do not specify the database name or a `CursorFactory`.
 145         // The `0` specifies a database version, but that is ignored and set instead using a constant in `BookmarksDatabaseHelper`.
 146         bookmarksDatabaseHelper = new BookmarksDatabaseHelper(this, null, null, 0);
 147
 148         // Load the home folder.
 149         loadFolder();
 150
 151         // Set a listener so that tapping a list item loads the URL or folder.
 152         bookmarksListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
 153             @Override
 154             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
 155                 // Convert the id from long to int to match the format of the bookmarks database.
 156                 int databaseID = (int) id;
 157
 158                 // Get the bookmark `Cursor` for this ID and move it to the first row.
 159                 Cursor bookmarkCursor = bookmarksDatabaseHelper.getBookmarkCursor(databaseID);
 160                 bookmarkCursor.moveToFirst();
 161
 162                 // Act upon the bookmark according to the type.
 163                 if (bookmarkCursor.getInt(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1) {  // The selected bookmark is a folder.
 164                     // Update `currentFolder`.
 165                     currentFolder = bookmarkCursor.getString(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 166
 167                     // Load the new folder.
 168                     loadFolder();
 169                 } else {  // The selected bookmark is not a folder.
 170                     // Get the bookmark URL and assign it to `formattedUrlString`.  `mainWebView` will automatically reload when `BookmarksActivity` closes.
 171                     MainWebViewActivity.formattedUrlString = bookmarkCursor.getString(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_URL));
 172
 173                     // Update the bookmarks folder for the bookmarks drawer in `MainWebViewActivity`.
 174                     MainWebViewActivity.currentBookmarksFolder = currentFolder;
 175
 176                     // Close the bookmarks drawer and reload the bookmarks `ListView` when returning to `MainWebViewActivity`.
 177                     MainWebViewActivity.restartFromBookmarksActivity = true;
 178
 179                     // Return to `MainWebViewActivity`.
 180                     NavUtils.navigateUpFromSameTask(bookmarksActivity);
 181                 }
 182
 183                 // Close the `Cursor`.
 184                 bookmarkCursor.close();
 185             }
 186         });
 187
 188         // `MultiChoiceModeListener` handles long clicks.
 189         bookmarksListView.setMultiChoiceModeListener(new AbsListView.MultiChoiceModeListener() {
 190             // Instantiate the common variables.
 191             MenuItem editBookmarkMenuItem;
 192             MenuItem deleteBookmarksMenuItem;
 193             MenuItem selectAllBookmarksMenuItem;
 194             boolean deletingBookmarks;
 195
 196             @Override
 197             public boolean onCreateActionMode(ActionMode mode, Menu menu) {
 198                 // Inflate the menu for the contextual app bar and set the title.
 199                 getMenuInflater().inflate(R.menu.bookmarks_context_menu, menu);
 200
 201                 // Set the title.
 202                 if (currentFolder.isEmpty()) {
 203                     // Use `R.string.bookmarks` if we are in the home folder.
 204                     mode.setTitle(R.string.bookmarks);
 205                 } else {  // Use the current folder name as the title.
 206                     mode.setTitle(currentFolder);
 207                 }
 208
 209                 // Get a handle for `MenuItems` that need to be selectively disabled.
 210                 moveBookmarkUpMenuItem = menu.findItem(R.id.move_bookmark_up);
 211                 moveBookmarkDownMenuItem = menu.findItem(R.id.move_bookmark_down);
 212                 editBookmarkMenuItem = menu.findItem(R.id.edit_bookmark);
 213                 deleteBookmarksMenuItem = menu.findItem(R.id.delete_bookmark);
 214                 selectAllBookmarksMenuItem = menu.findItem(R.id.context_menu_select_all_bookmarks);
 215
 216                 // Disable the delete bookmarks menu item if a delete is pending.
 217                 if (deletingBookmarks) {
 218                     deleteBookmarksMenuItem.setEnabled(false);
 219                 }
 220
 221                 // Store `contextualActionMode` so it can be closed programatically.
 222                 contextualActionMode = mode;
 223
 224                 // Make it so.
 225                 return true;
 226             }
 227
 228             @Override
 229             public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
 230                 // Get a handle for the move to folder menu item.
 231                 MenuItem moveToFolderMenuItem = menu.findItem(R.id.move_to_folder);
 232
 233                 // Get a `Cursor` with all of the folders.
 234                 Cursor folderCursor = bookmarksDatabaseHelper.getAllFoldersCursor();
 235
 236                 // Enable the move to folder menu item if at least one folder exists.
 237                 moveToFolderMenuItem.setVisible(folderCursor.getCount() > 0);
 238
 239                 // Make it so.
 240                 return true;
 241             }
 242
 243             @Override
 244             public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
 245                 // Get a long array of the selected bookmarks.
 246                 long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
 247
 248                 // Calculate the number of selected bookmarks.
 249                 int numberOfSelectedBookmarks = selectedBookmarksLongArray.length;
 250
 251                 // Adjust the `ActionMode` and the `Menu` according to the number of selected bookmarks.
 252                 if (numberOfSelectedBookmarks == 0) {  // No bookmarks are selected.
 253                     // Close the `ActionMode`.
 254                     mode.finish();
 255                 } else if (numberOfSelectedBookmarks == 1) {  // One bookmark is selected.
 256                     // List the number of selected bookmarks in the subtitle.
 257                     mode.setSubtitle(getString(R.string.one_selected));
 258
 259                     // Show the `Move Up`, `Move Down`, and  `Edit` options.
 260                     moveBookmarkUpMenuItem.setVisible(true);
 261                     moveBookmarkDownMenuItem.setVisible(true);
 262                     editBookmarkMenuItem.setVisible(true);
 263
 264                     // Update the enabled status of the move icons.
 265                     updateMoveIcons();
 266                 } else {  // More than one bookmark is selected.
 267                     // List the number of selected bookmarks in the subtitle.
 268                     mode.setSubtitle(numberOfSelectedBookmarks + " " + getString(R.string.selected));
 269
 270                     // Hide non-applicable `MenuItems`.
 271                     moveBookmarkUpMenuItem.setVisible(false);
 272                     moveBookmarkDownMenuItem.setVisible(false);
 273                     editBookmarkMenuItem.setVisible(false);
 274                 }
 275
 276                 // Do not show `Select All` if all the bookmarks are already checked.
 277                 if (bookmarksListView.getCheckedItemIds().length == bookmarksListView.getCount()) {
 278                     selectAllBookmarksMenuItem.setVisible(false);
 279                 } else {
 280                     selectAllBookmarksMenuItem.setVisible(true);
 281                 }
 282             }
 283
 284             @Override
 285             public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
 286                 // Get the menu item ID.
 287                 int menuItemId = item.getItemId();
 288
 289                 // Instantiate the common variables.
 290                 int selectedBookmarkPosition;
 291                 int selectedBookmarkNewPosition;
 292                 final SparseBooleanArray selectedBookmarksPositionsSparseBooleanArray;
 293
 294                 switch (menuItemId) {
 295                     case R.id.move_bookmark_up:
 296                         // Get the array of checked bookmark positions.
 297                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
 298
 299                         // Store the position of the selected bookmark.  Only one bookmark is selected when `move_bookmark_up` is enabled.
 300                         selectedBookmarkPosition = selectedBookmarksPositionsSparseBooleanArray.keyAt(0);
 301
 302                         // Calculate the new position of the selected bookmark.
 303                         selectedBookmarkNewPosition = selectedBookmarkPosition - 1;
 304
 305                         // Iterate through the bookmarks.
 306                         for (int i = 0; i < bookmarksListView.getCount(); i++) {
 307                             // Get the database ID for the current bookmark.
 308                             int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 309
 310                             // Update the display order for the current bookmark.
 311                             if (i == selectedBookmarkPosition) {  // The current bookmark is the selected bookmark.
 312                                 // Move the current bookmark up one.
 313                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i - 1);
 314                             } else if ((i + 1) == selectedBookmarkPosition){  // The current bookmark is immediately above the selected bookmark.
 315                                 // Move the current bookmark down one.
 316                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i + 1);
 317                             } else {  // The current bookmark is not changing positions.
 318                                 // Move `bookmarksCursor` to the current bookmark position.
 319                                 bookmarksCursor.moveToPosition(i);
 320
 321                                 // Update the display order only if it is not correct in the database.
 322                                 if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
 323                                     bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
 324                                 }
 325                             }
 326                         }
 327
 328                         // Update `bookmarksCursor` with the current contents of the bookmarks database.
 329                         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 330
 331                         // Update the `ListView`.
 332                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 333
 334                         // Scroll with the bookmark.
 335                         scrollBookmarks(selectedBookmarkNewPosition);
 336
 337                         // Update the enabled status of the move icons.
 338                         updateMoveIcons();
 339                         break;
 340
 341                     case R.id.move_bookmark_down:
 342                         // Get the array of checked bookmark positions.
 343                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
 344
 345                         // Store the position of the selected bookmark.  Only one bookmark is selected when `move_bookmark_down` is enabled.
 346                         selectedBookmarkPosition = selectedBookmarksPositionsSparseBooleanArray.keyAt(0);
 347
 348                         // Calculate the new position of the selected bookmark.
 349                         selectedBookmarkNewPosition = selectedBookmarkPosition + 1;
 350
 351                         // Iterate through the bookmarks.
 352                         for (int i = 0; i <bookmarksListView.getCount(); i++) {
 353                             // Get the database ID for the current bookmark.
 354                             int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 355
 356                             // Update the display order for the current bookmark.
 357                             if (i == selectedBookmarkPosition) {  // The current bookmark is the selected bookmark.
 358                                 // Move the current bookmark down one.
 359                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i + 1);
 360                             } else if ((i - 1) == selectedBookmarkPosition) {  // The current bookmark is immediately below the selected bookmark.
 361                                 // Move the bookmark below the selected bookmark up one.
 362                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i - 1);
 363                             } else {  // The current bookmark is not changing positions.
 364                                 // Move `bookmarksCursor` to the current bookmark position.
 365                                 bookmarksCursor.moveToPosition(i);
 366
 367                                 // Update the display order only if it is not correct in the database.
 368                                 if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
 369                                     bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
 370                                 }
 371                             }
 372                         }
 373
 374                         // Update `bookmarksCursor` with the current contents of the bookmarks database.
 375                         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 376
 377                         // Update the `ListView`.
 378                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 379
 380                         // Scroll with the bookmark.
 381                         scrollBookmarks(selectedBookmarkNewPosition);
 382
 383                         // Update the enabled status of the move icons.
 384                         updateMoveIcons();
 385                         break;
 386
 387                     case R.id.move_to_folder:
 388                         // Store `checkedItemIds` for use by the `AlertDialog`.
 389                         checkedItemIds = bookmarksListView.getCheckedItemIds();
 390
 391                         // Show the `MoveToFolderDialog` `AlertDialog` and name the instance `@string/move_to_folder
 392                         AppCompatDialogFragment moveToFolderDialog = new MoveToFolderDialog();
 393                         moveToFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.move_to_folder));
 394                         break;
 395
 396                     case R.id.edit_bookmark:
 397                         // Get the array of checked bookmark positions.
 398                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
 399
 400                         // Get the position of the selected bookmark.  Only one bookmark is selected when `edit_bookmark_down` is enabled.
 401                         selectedBookmarkPosition = selectedBookmarksPositionsSparseBooleanArray.keyAt(0);
 402
 403                         // Move to the selected position and find out if it is a folder.
 404                         bookmarksCursor.moveToPosition(selectedBookmarkPosition);
 405                         boolean isFolder = (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1);
 406
 407                         // Get the selected bookmark database ID.
 408                         int databaseId = bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper._ID));
 409
 410                         if (isFolder) {
 411                             // Save the current folder name, which is used in `onSaveEditBookmarkFolder()`.
 412                             oldFolderNameString = bookmarksCursor.getString(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 413
 414                             // Show the edit bookmark folder `AlertDialog` and name the instance `@string/edit_folder`.
 415                             AppCompatDialogFragment editFolderDialog = EditBookmarkFolderDialog.folderDatabaseId(databaseId);
 416                             editFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_folder));
 417                         } else {
 418                             // Show the edit bookmark `AlertDialog` and name the instance `@string/edit_bookmark`.
 419                             AppCompatDialogFragment editBookmarkDialog = EditBookmarkDialog.bookmarkDatabaseId(databaseId);
 420                             editBookmarkDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_bookmark));
 421                         }
 422                         break;
 423
 424                     case R.id.delete_bookmark:
 425                         // Set the deleting bookmarks flag, which prevents the delete menu item from being enabled until the current process finishes.
 426                         deletingBookmarks = true;
 427
 428                         // Get an array of the selected row IDs.
 429                         final long[] selectedBookmarksIdsLongArray = bookmarksListView.getCheckedItemIds();
 430
 431                         // 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.
 432                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions().clone();
 433
 434                         // Update `bookmarksCursor` with the current contents of the bookmarks database except for the specified database IDs.
 435                         bookmarksCursor = bookmarksDatabaseHelper.getBookmarksCursorExcept(selectedBookmarksIdsLongArray, currentFolder);
 436
 437                         // Update the `ListView`.
 438                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 439
 440                         // Instantiate `snackbarMessage`.
 441                         String snackbarMessage;
 442
 443                         // Determine how many items are in the array and prepare an appropriate `Snackbar` message.
 444                         if (selectedBookmarksIdsLongArray.length == 1) {
 445                             snackbarMessage = getString(R.string.one_bookmark_deleted);
 446                         } else {
 447                             snackbarMessage = selectedBookmarksIdsLongArray.length + " " + getString(R.string.bookmarks_deleted);
 448                         }
 449
 450                         // Show a SnackBar.
 451                         Snackbar.make(findViewById(R.id.bookmarks_coordinatorlayout), snackbarMessage, Snackbar.LENGTH_LONG)
 452                                 .setAction(R.string.undo, new View.OnClickListener() {
 453                                     @Override
 454                                     public void onClick(View view) {
 455                                         // Do nothing because everything will be handled by `onDismissed()` below.
 456                                     }
 457                                 })
 458                                 .addCallback(new Snackbar.Callback() {
 459                                     @Override
 460                                     public void onDismissed(Snackbar snackbar, int event) {
 461                                         switch (event) {
 462                                             // The user pushed the `Undo` button.
 463                                             case Snackbar.Callback.DISMISS_EVENT_ACTION:
 464                                                 // Update `bookmarksCursor` with the current contents of the bookmarks database, including the "deleted" bookmarks.
 465                                                 bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 466
 467                                                 // Update the `ListView`.
 468                                                 bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 469
 470                                                 // Re-select the previously selected bookmarks.
 471                                                 for (int i = 0; i < selectedBookmarksPositionsSparseBooleanArray.size(); i++) {
 472                                                     bookmarksListView.setItemChecked(selectedBookmarksPositionsSparseBooleanArray.keyAt(i), true);
 473                                                 }
 474
 475                                                 break;
 476
 477                                             // The `Snackbar` was dismissed without the `Undo` button being pushed.
 478                                             default:
 479                                                 // Delete each selected bookmark.
 480                                                 for (long databaseIdLong : selectedBookmarksIdsLongArray) {
 481                                                     // Convert `databaseIdLong` to an int.
 482                                                     int databaseIdInt = (int) databaseIdLong;
 483
 484                                                     // Delete the contents of the folder if the selected bookmark is a folder.
 485                                                     if (bookmarksDatabaseHelper.isFolder(databaseIdInt)) {
 486                                                         deleteBookmarkFolderContents(databaseIdInt);
 487                                                     }
 488
 489                                                     // Delete the selected bookmark.
 490                                                     bookmarksDatabaseHelper.deleteBookmark(databaseIdInt);
 491                                                 }
 492
 493                                                 // Update the display order.
 494                                                 for (int i = 0; i < bookmarksListView.getCount(); i++) {
 495                                                     // Get the database ID for the current bookmark.
 496                                                     int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 497
 498                                                     // Move `bookmarksCursor` to the current bookmark position.
 499                                                     bookmarksCursor.moveToPosition(i);
 500
 501                                                     // Update the display order only if it is not correct in the database.
 502                                                     if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
 503                                                         bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
 504                                                     }
 505                                                 }
 506                                         }
 507
 508                                         // Enable the delete bookmarks menu item.
 509                                         deleteBookmarksMenuItem.setEnabled(true);
 510
 511                                         // Reset the deleting bookmarks flag.
 512                                         deletingBookmarks = false;
 513                                     }
 514                                 })
 515                                 //Show the `SnackBar`.
 516                                 .show();
 517
 518                         // Close the `ActionBar`.
 519                         mode.finish();
 520                         break;
 521
 522                     case R.id.context_menu_select_all_bookmarks:
 523                         // Get the total number of bookmarks.
 524                         int numberOfBookmarks = bookmarksListView.getCount();
 525
 526                         // Select them all.
 527                         for (int i = 0; i < numberOfBookmarks; i++) {
 528                             bookmarksListView.setItemChecked(i, true);
 529                         }
 530                         break;
 531                 }
 532
 533                 // Consume the click.
 534                 return true;
 535             }
 536
 537             @Override
 538             public void onDestroyActionMode(ActionMode mode) {
 539                 // Do nothing.
 540             }
 541         });
 542
 543         // Get handles for the `FloatingActionButtons`.
 544         FloatingActionButton createBookmarkFolderFab = (FloatingActionButton) findViewById(R.id.create_bookmark_folder_fab);
 545         FloatingActionButton createBookmarkFab = (FloatingActionButton) findViewById(R.id.create_bookmark_fab);
 546
 547         // Set the create new bookmark folder FAB to display the `AlertDialog`.
 548         createBookmarkFolderFab.setOnClickListener(new View.OnClickListener() {
 549             @Override
 550             public void onClick(View v) {
 551                 // Show the `CreateBookmarkFolderDialog` `AlertDialog` and name the instance `@string/create_folder`.
 552                 AppCompatDialogFragment createBookmarkFolderDialog = new CreateBookmarkFolderDialog();
 553                 createBookmarkFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.create_folder));
 554             }
 555         });
 556
 557         // Set the create new bookmark FAB to display the `AlertDialog`.
 558         createBookmarkFab.setOnClickListener(new View.OnClickListener() {
 559             @Override
 560             public void onClick(View view) {
 561                 // Show the `CreateBookmarkDialog` `AlertDialog` and name the instance `@string/create_bookmark`.
 562                 AppCompatDialogFragment createBookmarkDialog = new CreateBookmarkDialog();
 563                 createBookmarkDialog.show(getSupportFragmentManager(), getResources().getString(R.string.create_bookmark));
 564             }
 565         });
 566     }
 567
 568     @Override
 569     public boolean onCreateOptionsMenu(Menu menu) {
 570         // Inflate the menu.
 571         getMenuInflater().inflate(R.menu.bookmarks_options_menu, menu);
 572
 573         // Success.
 574         return true;
 575     }
 576
 577     @Override
 578     public boolean onOptionsItemSelected(MenuItem menuItem) {
 579         // Get the ID of the `MenuItem` that was selected.
 580         int menuItemId = menuItem.getItemId();
 581
 582         switch (menuItemId) {
 583             case android.R.id.home:  // The home arrow is identified as `android.R.id.home`, not just `R.id.home`.
 584                 if (currentFolder.isEmpty()) {  // Currently in the home folder.
 585                     // Update the bookmarks folder for the bookmarks drawer in `MainWebViewActivity`.
 586                     MainWebViewActivity.currentBookmarksFolder = "";
 587
 588                     // Close the bookmarks drawer and reload the bookmarks `ListView` when returning to `MainWebViewActivity`.
 589                     MainWebViewActivity.restartFromBookmarksActivity = true;
 590
 591                     // Return to `MainWebViewActivity`.
 592                     NavUtils.navigateUpFromSameTask(this);
 593                 } else {  // Currently in a subfolder.
 594                     // Place the former parent folder in `currentFolder`.
 595                     currentFolder = bookmarksDatabaseHelper.getParentFolder(currentFolder);
 596
 597                     // Load the new folder.
 598                     loadFolder();
 599                 }
 600                 break;
 601
 602             case R.id.options_menu_select_all_bookmarks:
 603                 // Get the total number of bookmarks.
 604                 int numberOfBookmarks = bookmarksListView.getCount();
 605
 606                 // Select them all.
 607                 for (int i = 0; i < numberOfBookmarks; i++) {
 608                     bookmarksListView.setItemChecked(i, true);
 609                 }
 610                 break;
 611
 612             case R.id.bookmarks_database_view:
 613                 // Launch `BookmarksDatabaseViewActivity`.
 614                 Intent bookmarksDatabaseViewIntent = new Intent(this, BookmarksDatabaseViewActivity.class);
 615                 startActivity(bookmarksDatabaseViewIntent);
 616                 break;
 617         }
 618         return true;
 619     }
 620
 621     @Override
 622     public void onBackPressed() {
 623         if (currentFolder.isEmpty()) {  // Currently in the home folder.
 624             // Update the bookmarks folder for the bookmarks drawer in `MainWebViewActivity`.
 625             MainWebViewActivity.currentBookmarksFolder = "";
 626
 627             // Close the bookmarks drawer and reload the bookmarks `ListView` when returning to `MainWebViewActivity`.
 628             MainWebViewActivity.restartFromBookmarksActivity = true;
 629
 630             // Exit `BookmarksActivity`.
 631             super.onBackPressed();
 632         } else {  // Currently in a subfolder.
 633             // Place the former parent folder in `currentFolder`.
 634             currentFolder = bookmarksDatabaseHelper.getParentFolder(currentFolder);
 635
 636             // Load the new folder.
 637             loadFolder();
 638         }
 639     }
 640
 641     @Override
 642     public void onCreateBookmark(AppCompatDialogFragment dialogFragment) {
 643         // Get the `EditTexts` from the `dialogFragment`.
 644         EditText createBookmarkNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.create_bookmark_name_edittext);
 645         EditText createBookmarkUrlEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.create_bookmark_url_edittext);
 646
 647         // Extract the strings from the `EditTexts`.
 648         String bookmarkNameString = createBookmarkNameEditText.getText().toString();
 649         String bookmarkUrlString = createBookmarkUrlEditText.getText().toString();
 650
 651         // Convert the favoriteIcon Bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
 652         ByteArrayOutputStream favoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
 653         MainWebViewActivity.favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, favoriteIconByteArrayOutputStream);
 654         byte[] favoriteIconByteArray = favoriteIconByteArrayOutputStream.toByteArray();
 655
 656         // Display the new bookmark below the current items in the (0 indexed) list.
 657         int newBookmarkDisplayOrder = bookmarksListView.getCount();
 658
 659         // Create the bookmark.
 660         bookmarksDatabaseHelper.createBookmark(bookmarkNameString, bookmarkUrlString, newBookmarkDisplayOrder, currentFolder, favoriteIconByteArray);
 661
 662         // Update `bookmarksCursor` with the current contents of this folder.
 663         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 664
 665         // Update the `ListView`.
 666         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 667
 668         // Scroll to the new bookmark.
 669         bookmarksListView.setSelection(newBookmarkDisplayOrder);
 670     }
 671
 672     @Override
 673     public void onCreateBookmarkFolder(AppCompatDialogFragment dialogFragment) {
 674         // Get handles for the views in `dialogFragment`.
 675         EditText createFolderNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.create_folder_name_edittext);
 676         RadioButton defaultFolderIconRadioButton = (RadioButton) dialogFragment.getDialog().findViewById(R.id.create_folder_default_icon_radiobutton);
 677         ImageView folderIconImageView = (ImageView) dialogFragment.getDialog().findViewById(R.id.create_folder_default_icon);
 678
 679         // Get new folder name string.
 680         String folderNameString = createFolderNameEditText.getText().toString();
 681
 682         // Get the new folder icon `Bitmap`.
 683         Bitmap folderIconBitmap;
 684         if (defaultFolderIconRadioButton.isChecked()) {  // Use the default folder icon.
 685             // Get the default folder icon and convert it to a `Bitmap`.
 686             Drawable folderIconDrawable = folderIconImageView.getDrawable();
 687             BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 688             folderIconBitmap = folderIconBitmapDrawable.getBitmap();
 689         } else {  // Use the `WebView` favorite icon.
 690             folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 691         }
 692
 693         // Convert `folderIconBitmap` to a byte array.  `0` is for lossless compression (the only option for a PNG).
 694         ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
 695         folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
 696         byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
 697
 698         // Move all the bookmarks down one in the display order.
 699         for (int i = 0; i < bookmarksListView.getCount(); i++) {
 700             int databaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 701             bookmarksDatabaseHelper.updateDisplayOrder(databaseId, i + 1);
 702         }
 703
 704         // Create the folder, placing it at the top of the ListView
 705         bookmarksDatabaseHelper.createFolder(folderNameString, 0, currentFolder, folderIconByteArray);
 706
 707         // Update `bookmarksCursor` with the current contents of this folder.
 708         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 709
 710         // Update the `ListView`.
 711         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 712
 713         // Scroll to the new folder.
 714         bookmarksListView.setSelection(0);
 715     }
 716
 717     @Override
 718     public void onSaveEditBookmark(AppCompatDialogFragment dialogFragment, int selectedBookmarkDatabaseId) {
 719         // Get handles for the views from `dialogFragment`.
 720         EditText editBookmarkNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.edit_bookmark_name_edittext);
 721         EditText editBookmarkUrlEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.edit_bookmark_url_edittext);
 722         RadioButton currentBookmarkIconRadioButton = (RadioButton) dialogFragment.getDialog().findViewById(R.id.edit_bookmark_current_icon_radiobutton);
 723
 724         // Store the bookmark strings.
 725         String bookmarkNameString = editBookmarkNameEditText.getText().toString();
 726         String bookmarkUrlString = editBookmarkUrlEditText.getText().toString();
 727
 728         // Update the bookmark.
 729         if (currentBookmarkIconRadioButton.isChecked()) {  // Update the bookmark without changing the favorite icon.
 730             bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString);
 731         } else {  // Update the bookmark using the `WebView` favorite icon.
 732             // Convert the favorite icon to a byte array.  `0` is for lossless compression (the only option for a PNG).
 733             ByteArrayOutputStream newFavoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
 734             MainWebViewActivity.favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFavoriteIconByteArrayOutputStream);
 735             byte[] newFavoriteIconByteArray = newFavoriteIconByteArrayOutputStream.toByteArray();
 736
 737             //  Update the bookmark and the favorite icon.
 738             bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString, newFavoriteIconByteArray);
 739         }
 740
 741         // Close the contextual action mode.
 742         contextualActionMode.finish();
 743
 744         // Update `bookmarksCursor` with the current contents of this folder.
 745         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 746
 747         // Update the `ListView`.
 748         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 749     }
 750
 751     @Override
 752     public void onSaveEditBookmarkFolder(AppCompatDialogFragment dialogFragment, int selectedFolderDatabaseId) {
 753         // Get handles for the views from `dialogFragment`.
 754         EditText editFolderNameEditText = (EditText) dialogFragment.getDialog().findViewById(R.id.edit_folder_name_edittext);
 755         RadioButton currentFolderIconRadioButton = (RadioButton) dialogFragment.getDialog().findViewById(R.id.edit_folder_current_icon_radiobutton);
 756         RadioButton defaultFolderIconRadioButton = (RadioButton) dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon_radiobutton);
 757         ImageView folderIconImageView = (ImageView) dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon);
 758
 759         // Get the new folder name.
 760         String newFolderNameString = editFolderNameEditText.getText().toString();
 761
 762         // Check if the favorite icon has changed.
 763         if (currentFolderIconRadioButton.isChecked()) {  // Only the name has changed.
 764             // Update the name in the database.
 765             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, oldFolderNameString, newFolderNameString);
 766         } else if (!currentFolderIconRadioButton.isChecked() && newFolderNameString.equals(oldFolderNameString)) {  // Only the icon has changed.
 767             // Get the new folder icon `Bitmap`.
 768             Bitmap folderIconBitmap;
 769             if (defaultFolderIconRadioButton.isChecked()) {
 770                 // Get the default folder icon and convert it to a `Bitmap`.
 771                 Drawable folderIconDrawable = folderIconImageView.getDrawable();
 772                 BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 773                 folderIconBitmap = folderIconBitmapDrawable.getBitmap();
 774             } else {  // Use the `WebView` favorite icon.
 775                 folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 776             }
 777
 778             // Convert the folder `Bitmap` to a byte array.  `0` is for lossless compression (the only option for a PNG).
 779             ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
 780             folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
 781             byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
 782
 783             // Update the folder icon in the database.
 784             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, folderIconByteArray);
 785         } else {  // The folder icon and the name have changed.
 786             // Get the new folder icon `Bitmap`.
 787             Bitmap folderIconBitmap;
 788             if (defaultFolderIconRadioButton.isChecked()) {
 789                 // Get the default folder icon and convert it to a `Bitmap`.
 790                 Drawable folderIconDrawable = folderIconImageView.getDrawable();
 791                 BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 792                 folderIconBitmap = folderIconBitmapDrawable.getBitmap();
 793             } else {  // Use the `WebView` favorite icon.
 794                 folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 795             }
 796
 797             // Convert the folder `Bitmap` to a byte array.  `0` is for lossless compression (the only option for a PNG).
 798             ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
 799             folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
 800             byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
 801
 802             // Update the folder name and icon in the database.
 803             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, oldFolderNameString, newFolderNameString, folderIconByteArray);
 804         }
 805
 806         // Update `bookmarksCursor` with the current contents of this folder.
 807         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 808
 809         // Update the `ListView`.
 810         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 811
 812         // Close the contextual action mode.
 813         contextualActionMode.finish();
 814     }
 815
 816     @Override
 817     public void onMoveToFolder(AppCompatDialogFragment dialogFragment) {
 818         // Get a handle for the `ListView` from `dialogFragment`.
 819         ListView folderListView = (ListView) dialogFragment.getDialog().findViewById(R.id.move_to_folder_listview);
 820
 821         // Store a long array of the selected folders.
 822         long[] newFolderLongArray = folderListView.getCheckedItemIds();
 823
 824         // Get the new folder database ID.  Only one folder will be selected.
 825         int newFolderDatabaseId = (int) newFolderLongArray[0];
 826
 827         // Instantiate `newFolderName`.
 828         String newFolderName;
 829
 830         // Set the new folder name.
 831         if (newFolderDatabaseId == 0) {
 832             // The new folder is the home folder, represented as `""` in the database.
 833             newFolderName = "";
 834         } else {
 835             // Get the new folder name from the database.
 836             newFolderName = bookmarksDatabaseHelper.getFolderName(newFolderDatabaseId);
 837         }
 838
 839         // Get a long array with the the database ID of the selected bookmarks.
 840         long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
 841
 842         // Move each of the selected bookmarks to the new folder.
 843         for (long databaseIdLong : selectedBookmarksLongArray) {
 844             // Get `databaseIdInt` for each selected bookmark.
 845             int databaseIdInt = (int) databaseIdLong;
 846
 847             // Move the selected bookmark to the new folder.
 848             bookmarksDatabaseHelper.moveToFolder(databaseIdInt, newFolderName);
 849         }
 850
 851         // Update `bookmarksCursor` with the current contents of this folder.
 852         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 853
 854         // Update the `ListView`.
 855         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 856
 857         // Close the contextual app bar.
 858         contextualActionMode.finish();
 859     }
 860
 861     private void deleteBookmarkFolderContents(int databaseId) {
 862         // Get the name of the folder.
 863         String folderName = bookmarksDatabaseHelper.getFolderName(databaseId);
 864
 865         // Get the contents of the folder.
 866         Cursor folderCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(folderName);
 867
 868         // Delete each of the bookmarks in the folder.
 869         for (int i = 0; i < folderCursor.getCount(); i++) {
 870             // Move `folderCursor` to the current row.
 871             folderCursor.moveToPosition(i);
 872
 873             // Get the database ID of the item.
 874             int itemDatabaseId = folderCursor.getInt(folderCursor.getColumnIndex(BookmarksDatabaseHelper._ID));
 875
 876             // If this is a folder, recursively delete the contents first.
 877             if (bookmarksDatabaseHelper.isFolder(itemDatabaseId)) {
 878                 deleteBookmarkFolderContents(itemDatabaseId);
 879             }
 880
 881             // Delete the bookmark.
 882             bookmarksDatabaseHelper.deleteBookmark(itemDatabaseId);
 883         }
 884     }
 885
 886     private void updateMoveIcons() {
 887         // Get a long array of the selected bookmarks.
 888         long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
 889
 890         // Get the database IDs for the first, last, and selected bookmarks.
 891         int selectedBookmarkDatabaseId = (int) selectedBookmarksLongArray[0];
 892         int firstBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(0);
 893         // bookmarksListView is 0 indexed.
 894         int lastBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(bookmarksListView.getCount() - 1);
 895
 896         // Update the move bookmark up `MenuItem`.
 897         if (selectedBookmarkDatabaseId == firstBookmarkDatabaseId) {  // The selected bookmark is in the first position.
 898             // Disable the move bookmark up `MenuItem`.
 899             moveBookmarkUpMenuItem.setEnabled(false);
 900
 901             //  Set the move bookmark up icon to be ghosted.
 902             moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_disabled);
 903         } else {  // The selected bookmark is not in the first position.
 904             // Enable the move bookmark up `MenuItem`.
 905             moveBookmarkUpMenuItem.setEnabled(true);
 906
 907             // Set the icon according to the theme.
 908             if (MainWebViewActivity.darkTheme) {
 909                 moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_enabled_dark);
 910             } else {
 911                 moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_enabled_light);
 912             }
 913         }
 914
 915         // Update the move bookmark down `MenuItem`.
 916         if (selectedBookmarkDatabaseId == lastBookmarkDatabaseId) {  // The selected bookmark is in the last position.
 917             // Disable the move bookmark down `MenuItem`.
 918             moveBookmarkDownMenuItem.setEnabled(false);
 919
 920             // Set the move bookmark down icon to be ghosted.
 921             moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_disabled);
 922         } else {  // The selected bookmark is not in the last position.
 923             // Enable the move bookmark down `MenuItem`.
 924             moveBookmarkDownMenuItem.setEnabled(true);
 925
 926             // Set the icon according to the theme.
 927             if (MainWebViewActivity.darkTheme) {
 928                 moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_enabled_dark);
 929             } else {
 930                 moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_enabled_light);
 931             }
 932         }
 933     }
 934
 935     private void scrollBookmarks(int selectedBookmarkPosition) {
 936         // Get the first and last visible bookmark positions.
 937         int firstVisibleBookmarkPosition = bookmarksListView.getFirstVisiblePosition();
 938         int lastVisibleBookmarkPosition = bookmarksListView.getLastVisiblePosition();
 939
 940         // Calculate the number of bookmarks per screen.
 941         int numberOfBookmarksPerScreen = lastVisibleBookmarkPosition - firstVisibleBookmarkPosition;
 942
 943         // Scroll with the moved bookmark if necessary.
 944         if (selectedBookmarkPosition <= firstVisibleBookmarkPosition) {  // The selected bookmark position is at or above the top of the screen.
 945             // Scroll to the selected bookmark position.
 946             bookmarksListView.setSelection(selectedBookmarkPosition);
 947         } 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`.
 948             // 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`.
 949             bookmarksListView.setSelection(selectedBookmarkPosition - numberOfBookmarksPerScreen + 1);
 950         }
 951     }
 952
 953     private void loadFolder() {
 954         // Update `bookmarksCursor` with the contents of the bookmarks database for the current folder.
 955         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
 956
 957         // Setup a `CursorAdapter`.  `this` specifies the `Context`.  `false` disables `autoRequery`.
 958         bookmarksCursorAdapter = new CursorAdapter(this, bookmarksCursor, false) {
 959             @Override
 960             public View newView(Context context, Cursor cursor, ViewGroup parent) {
 961                 // Inflate the individual item layout.  `false` does not attach it to the root.
 962                 return getLayoutInflater().inflate(R.layout.bookmarks_activity_item_linearlayout, parent, false);
 963             }
 964
 965             @Override
 966             public void bindView(View view, Context context, Cursor cursor) {
 967                 // Get handles for the views.
 968                 ImageView bookmarkFavoriteIcon = (ImageView) view.findViewById(R.id.bookmark_favorite_icon);
 969                 TextView bookmarkNameTextView = (TextView) view.findViewById(R.id.bookmark_name);
 970
 971                 // Get the favorite icon byte array from the `Cursor`.
 972                 byte[] favoriteIconByteArray = cursor.getBlob(cursor.getColumnIndex(BookmarksDatabaseHelper.FAVORITE_ICON));
 973
 974                 // Convert the byte array to a `Bitmap` beginning at the first byte and ending at the last.
 975                 Bitmap favoriteIconBitmap = BitmapFactory.decodeByteArray(favoriteIconByteArray, 0, favoriteIconByteArray.length);
 976
 977                 // Display the bitmap in `bookmarkFavoriteIcon`.
 978                 bookmarkFavoriteIcon.setImageBitmap(favoriteIconBitmap);
 979
 980                 // Get the bookmark name from the cursor and display it in `bookmarkNameTextView`.
 981                 String bookmarkNameString = cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 982                 bookmarkNameTextView.setText(bookmarkNameString);
 983
 984                 // Make the font bold for folders.
 985                 if (cursor.getInt(cursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1) {
 986                     bookmarkNameTextView.setTypeface(Typeface.DEFAULT_BOLD);
 987                 } else {  // Reset the font to default for normal bookmarks.
 988                     bookmarkNameTextView.setTypeface(Typeface.DEFAULT);
 989                 }
 990             }
 991         };
 992
 993         // Populate the `ListView` with the adapter.
 994         bookmarksListView.setAdapter(bookmarksCursorAdapter);
 995
 996         // Set the `AppBar` title.
 997         if (currentFolder.isEmpty()) {
 998             appBar.setTitle(R.string.bookmarks);
 999         } else {
1000             appBar.setTitle(currentFolder);
1001         }
1002     }
1003 }