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

   1 /*
   2  * Copyright © 2016-2019 Soren Stoutner <soren@stoutner.com>.
   3  *
   4  * This file is part of Privacy Browser <https://www.stoutner.com/privacy-browser>.
   5  *
   6  * Privacy Browser is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * Privacy Browser is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with Privacy Browser.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 package com.stoutner.privacybrowser.activities;
  21
  22 import android.annotation.SuppressLint;
  23 import android.app.Activity;
  24 import android.content.Context;
  25 import android.content.Intent;
  26 import android.database.Cursor;
  27 import android.graphics.Bitmap;
  28 import android.graphics.BitmapFactory;
  29 import android.graphics.Typeface;
  30 import android.graphics.drawable.BitmapDrawable;
  31 import android.graphics.drawable.Drawable;
  32 import android.os.Bundle;
  33 import android.util.SparseBooleanArray;
  34 import android.view.ActionMode;
  35 import android.view.Menu;
  36 import android.view.MenuItem;
  37 import android.view.View;
  38 import android.view.ViewGroup;
  39 import android.view.WindowManager;
  40 import android.widget.AbsListView;
  41 import android.widget.CursorAdapter;
  42 import android.widget.EditText;
  43 import android.widget.ImageView;
  44 import android.widget.ListView;
  45 import android.widget.RadioButton;
  46 import android.widget.TextView;
  47
  48 import androidx.appcompat.app.ActionBar;
  49 import androidx.appcompat.app.AppCompatActivity;
  50 import androidx.appcompat.widget.Toolbar;  // The AndroidX toolbar must be used until the minimum API is >= 21.
  51 import androidx.core.app.NavUtils;
  52 import androidx.fragment.app.DialogFragment;
  53
  54 import com.google.android.material.floatingactionbutton.FloatingActionButton;
  55 import com.google.android.material.snackbar.Snackbar;
  56
  57 import com.stoutner.privacybrowser.dialogs.CreateBookmarkDialog;
  58 import com.stoutner.privacybrowser.dialogs.CreateBookmarkFolderDialog;
  59 import com.stoutner.privacybrowser.dialogs.EditBookmarkDialog;
  60 import com.stoutner.privacybrowser.dialogs.EditBookmarkFolderDialog;
  61 import com.stoutner.privacybrowser.dialogs.MoveToFolderDialog;
  62 import com.stoutner.privacybrowser.R;
  63 import com.stoutner.privacybrowser.helpers.BookmarksDatabaseHelper;
  64
  65 import java.io.ByteArrayOutputStream;
  66
  67 public class BookmarksActivity extends AppCompatActivity implements CreateBookmarkDialog.CreateBookmarkListener, CreateBookmarkFolderDialog.CreateBookmarkFolderListener, EditBookmarkDialog.EditBookmarkListener,
  68         EditBookmarkFolderDialog.EditBookmarkFolderListener, MoveToFolderDialog.MoveToFolderListener {
  69
  70     // `currentFolder` is public static so it can be accessed from `MoveToFolderDialog` and `BookmarksDatabaseViewActivity`.
  71     // It is used in `onCreate`, `onOptionsItemSelected()`, `onBackPressed()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`,
  72     // 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()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`,
  76     // and `updateMoveIcons()`.
  77     public static long[] checkedItemIds;
  78
  79     // `restartFromBookmarksDatabaseViewActivity` is public static so it can be accessed from `BookmarksDatabaseViewActivity`.  It is also used in `onRestart()`.
  80     public static boolean restartFromBookmarksDatabaseViewActivity;
  81
  82     //  The current WebView strings are public static so they can be updated from `MainWebViewActivity`.  They are use in `onCreate()`.
  83     public static String currentWebViewUrl;
  84     public static String currentWebViewTitle;
  85
  86
  87     // `bookmarksDatabaseHelper` is used in `onCreate()`, `onOptionsItemSelected()`, `onBackPressed()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`,
  88     // `onMoveToFolder()`, `deleteBookmarkFolderContents()`, `loadFolder()`, and `onDestroy()`.
  89     private BookmarksDatabaseHelper bookmarksDatabaseHelper;
  90
  91     // `bookmarksListView` is used in `onCreate()`, `onOptionsItemSelected()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`,
  92     // `updateMoveIcons()`, `scrollBookmarks()`, and `loadFolder()`.
  93     private ListView bookmarksListView;
  94
  95     // `bookmarksCursor` is used in `onCreate()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`, `deleteBookmarkFolderContents()`,
  96     // `loadFolder()`, and `onDestroy()`.
  97     private Cursor bookmarksCursor;
  98
  99     // `bookmarksCursorAdapter` is used in `onCreate(), `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`, and `onLoadFolder()`.
 100     private CursorAdapter bookmarksCursorAdapter;
 101
 102     // `contextualActionMode` is used in `onCreate()`, `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()` and `onMoveToFolder()`.
 103     private ActionMode contextualActionMode;
 104
 105     // `appBar` is used in `onCreate()` and `loadFolder()`.
 106     private ActionBar appBar;
 107
 108     // `oldFolderName` is used in `onCreate()` and `onSaveBookmarkFolder()`.
 109     private String oldFolderNameString;
 110
 111     // `moveBookmarkUpMenuItem` is used in `onCreate()` and `updateMoveIcons()`.
 112     private MenuItem moveBookmarkUpMenuItem;
 113
 114     // `moveBookmarkDownMenuItem` is used in `onCreate()` and `updateMoveIcons()`.
 115     private MenuItem moveBookmarkDownMenuItem;
 116
 117     // `bookmarksDeletedSnackbar` is used in `onCreate()`, `onOptionsItemSelected()`, and `onBackPressed()`.
 118     private Snackbar bookmarksDeletedSnackbar;
 119
 120     // `closeActivityAfterDismissingSnackbar` is used in `onCreate()`, `onOptionsItemSelected()`, and `onBackPressed()`.
 121     private boolean closeActivityAfterDismissingSnackbar;
 122
 123     @Override
 124     protected void onCreate(Bundle savedInstanceState) {
 125         // Disable screenshots if not allowed.
 126         if (!MainWebViewActivity.allowScreenshots) {
 127             getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
 128         }
 129
 130         // Set the activity theme.
 131         if (MainWebViewActivity.darkTheme) {
 132             setTheme(R.style.PrivacyBrowserDark_SecondaryActivity);
 133         } else {
 134             setTheme(R.style.PrivacyBrowserLight_SecondaryActivity);
 135         }
 136
 137         // Run the default commands.
 138         super.onCreate(savedInstanceState);
 139
 140         // Get the intent that launched the activity.
 141         Intent launchingIntent = getIntent();
 142
 143         // Set the current folder variable.
 144         if (launchingIntent.getStringExtra("Current Folder") != null) {  // Set the current folder from the intent.
 145             currentFolder = launchingIntent.getStringExtra("Current Folder");
 146         } else {  // Set the current folder to be `""`, which is the home folder.
 147             currentFolder = "";
 148         }
 149
 150         // Set the content view.
 151         setContentView(R.layout.bookmarks_coordinatorlayout);
 152
 153         // The AndroidX toolbar must be used until the minimum API is >= 21.
 154         final Toolbar toolbar = findViewById(R.id.bookmarks_toolbar);
 155         setSupportActionBar(toolbar);
 156
 157         // Get a handle for the activity, the app bar, and the ListView.
 158         final Activity bookmarksActivity = this;
 159         appBar = getSupportActionBar();
 160         bookmarksListView = findViewById(R.id.bookmarks_listview);
 161
 162         // Remove the incorrect lint warning that `appBar` might be null.
 163         assert appBar != null;
 164
 165         // Display the home arrow on the app bar.
 166         appBar.setDisplayHomeAsUpEnabled(true);
 167
 168         // Initialize the database helper.  `this` specifies the context.  The two `nulls` do not specify the database name or a `CursorFactory`.
 169         // The `0` specifies a database version, but that is ignored and set instead using a constant in `BookmarksDatabaseHelper`.
 170         bookmarksDatabaseHelper = new BookmarksDatabaseHelper(this, null, null, 0);
 171
 172         // Load the home folder.
 173         loadFolder();
 174
 175         // Set a listener so that tapping a list item loads the URL or folder.
 176         bookmarksListView.setOnItemClickListener((parent, view, position, id) -> {
 177             // Convert the id from long to int to match the format of the bookmarks database.
 178             int databaseID = (int) id;
 179
 180             // Get the bookmark cursor for this ID and move it to the first row.
 181             Cursor bookmarkCursor = bookmarksDatabaseHelper.getBookmark(databaseID);
 182             bookmarkCursor.moveToFirst();
 183
 184             // Act upon the bookmark according to the type.
 185             if (bookmarkCursor.getInt(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1) {  // The selected bookmark is a folder.
 186                 // Update the current folder.
 187                 currentFolder = bookmarkCursor.getString(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 188
 189                 // Load the new folder.
 190                 loadFolder();
 191             } else {  // The selected bookmark is not a folder.
 192                 // Get the bookmark URL and assign it to `formattedUrlString`.
 193                 MainWebViewActivity.formattedUrlString = bookmarkCursor.getString(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_URL));
 194
 195                 // Set `MainWebViewActivity` to load the new URL on restart.
 196                 MainWebViewActivity.loadUrlOnRestart = true;
 197
 198                 // Update the bookmarks folder for the bookmarks drawer in `MainWebViewActivity`.
 199                 MainWebViewActivity.currentBookmarksFolder = currentFolder;
 200
 201                 // Close the bookmarks drawer and reload the bookmarks `ListView` when returning to `MainWebViewActivity`.
 202                 MainWebViewActivity.restartFromBookmarksActivity = true;
 203
 204                 // Return to `MainWebViewActivity`.
 205                 NavUtils.navigateUpFromSameTask(bookmarksActivity);
 206             }
 207
 208             // Close the `Cursor`.
 209             bookmarkCursor.close();
 210         });
 211
 212         // Handle long presses on the list view.
 213         bookmarksListView.setMultiChoiceModeListener(new AbsListView.MultiChoiceModeListener() {
 214             // Instantiate the common variables.
 215             MenuItem editBookmarkMenuItem;
 216             MenuItem deleteBookmarksMenuItem;
 217             MenuItem selectAllBookmarksMenuItem;
 218             boolean deletingBookmarks;
 219
 220             @Override
 221             public boolean onCreateActionMode(ActionMode mode, Menu menu) {
 222                 // Inflate the menu for the contextual app bar.
 223                 getMenuInflater().inflate(R.menu.bookmarks_context_menu, menu);
 224
 225                 // Set the title.
 226                 if (currentFolder.isEmpty()) {  // Use `R.string.bookmarks` if in the home folder.
 227                     mode.setTitle(R.string.bookmarks);
 228                 } else {  // Use the current folder name as the title.
 229                     mode.setTitle(currentFolder);
 230                 }
 231
 232                 // Get handles for menu items that need to be selectively disabled.
 233                 moveBookmarkUpMenuItem = menu.findItem(R.id.move_bookmark_up);
 234                 moveBookmarkDownMenuItem = menu.findItem(R.id.move_bookmark_down);
 235                 editBookmarkMenuItem = menu.findItem(R.id.edit_bookmark);
 236                 deleteBookmarksMenuItem = menu.findItem(R.id.delete_bookmark);
 237                 selectAllBookmarksMenuItem = menu.findItem(R.id.context_menu_select_all_bookmarks);
 238
 239                 // Disable the delete bookmarks menu item if a delete is pending.
 240                 deleteBookmarksMenuItem.setEnabled(!deletingBookmarks);
 241
 242                 // Store a handle for the contextual action mode so it can be closed programatically.
 243                 contextualActionMode = mode;
 244
 245                 // Make it so.
 246                 return true;
 247             }
 248
 249             @Override
 250             public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
 251                 // Get a handle for the move to folder menu item.
 252                 MenuItem moveToFolderMenuItem = menu.findItem(R.id.move_to_folder);
 253
 254                 // Get a Cursor with all of the folders.
 255                 Cursor folderCursor = bookmarksDatabaseHelper.getAllFolders();
 256
 257                 // Enable the move to folder menu item if at least one folder exists.
 258                 moveToFolderMenuItem.setVisible(folderCursor.getCount() > 0);
 259
 260                 // Make it so.
 261                 return true;
 262             }
 263
 264             @Override
 265             public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
 266                 // Get the number of selected bookmarks.
 267                 int numberOfSelectedBookmarks = bookmarksListView.getCheckedItemCount();
 268
 269                 // Adjust the ActionMode and the menu according to the number of selected bookmarks.
 270                 if (numberOfSelectedBookmarks == 1) {  // One bookmark is selected.
 271                     // List the number of selected bookmarks in the subtitle.
 272                     mode.setSubtitle(getString(R.string.selected) + "  1");
 273
 274                     // Show the `Move Up`, `Move Down`, and  `Edit` options.
 275                     moveBookmarkUpMenuItem.setVisible(true);
 276                     moveBookmarkDownMenuItem.setVisible(true);
 277                     editBookmarkMenuItem.setVisible(true);
 278
 279                     // Update the enabled status of the move icons.
 280                     updateMoveIcons();
 281                 } else {  // More than one bookmark is selected.
 282                     // List the number of selected bookmarks in the subtitle.
 283                     mode.setSubtitle(getString(R.string.selected) + "  " + numberOfSelectedBookmarks);
 284
 285                     // Hide non-applicable `MenuItems`.
 286                     moveBookmarkUpMenuItem.setVisible(false);
 287                     moveBookmarkDownMenuItem.setVisible(false);
 288                     editBookmarkMenuItem.setVisible(false);
 289                 }
 290
 291                 // Do not show the select all menu item if all the bookmarks are already checked.
 292                 if (bookmarksListView.getCheckedItemCount() == bookmarksListView.getCount()) {
 293                     selectAllBookmarksMenuItem.setVisible(false);
 294                 } else {
 295                     selectAllBookmarksMenuItem.setVisible(true);
 296                 }
 297             }
 298
 299             @Override
 300             public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
 301                 // Instantiate the common variables.
 302                 int selectedBookmarkPosition;
 303                 int selectedBookmarkNewPosition;
 304                 final SparseBooleanArray selectedBookmarksPositionsSparseBooleanArray;
 305
 306                 switch (item.getItemId()) {
 307                     case R.id.move_bookmark_up:
 308                         // Get the array of checked bookmark positions.
 309                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
 310
 311                         // Store the position of the selected bookmark.  Only one bookmark is selected when `move_bookmark_up` is enabled.
 312                         selectedBookmarkPosition = selectedBookmarksPositionsSparseBooleanArray.keyAt(0);
 313
 314                         // Calculate the new position of the selected bookmark.
 315                         selectedBookmarkNewPosition = selectedBookmarkPosition - 1;
 316
 317                         // Iterate through the bookmarks.
 318                         for (int i = 0; i < bookmarksListView.getCount(); i++) {
 319                             // Get the database ID for the current bookmark.
 320                             int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 321
 322                             // Update the display order for the current bookmark.
 323                             if (i == selectedBookmarkPosition) {  // The current bookmark is the selected bookmark.
 324                                 // Move the current bookmark up one.
 325                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i - 1);
 326                             } else if ((i + 1) == selectedBookmarkPosition){  // The current bookmark is immediately above the selected bookmark.
 327                                 // Move the current bookmark down one.
 328                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i + 1);
 329                             } else {  // The current bookmark is not changing positions.
 330                                 // Move `bookmarksCursor` to the current bookmark position.
 331                                 bookmarksCursor.moveToPosition(i);
 332
 333                                 // Update the display order only if it is not correct in the database.
 334                                 if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
 335                                     bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
 336                                 }
 337                             }
 338                         }
 339
 340                         // Update the bookmarks cursor with the current contents of the bookmarks database.
 341                         bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolder);
 342
 343                         // Update the `ListView`.
 344                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 345
 346                         // Scroll with the bookmark.
 347                         scrollBookmarks(selectedBookmarkNewPosition);
 348
 349                         // Update the enabled status of the move icons.
 350                         updateMoveIcons();
 351                         break;
 352
 353                     case R.id.move_bookmark_down:
 354                         // Get the array of checked bookmark positions.
 355                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
 356
 357                         // Store the position of the selected bookmark.  Only one bookmark is selected when `move_bookmark_down` is enabled.
 358                         selectedBookmarkPosition = selectedBookmarksPositionsSparseBooleanArray.keyAt(0);
 359
 360                         // Calculate the new position of the selected bookmark.
 361                         selectedBookmarkNewPosition = selectedBookmarkPosition + 1;
 362
 363                         // Iterate through the bookmarks.
 364                         for (int i = 0; i <bookmarksListView.getCount(); i++) {
 365                             // Get the database ID for the current bookmark.
 366                             int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 367
 368                             // Update the display order for the current bookmark.
 369                             if (i == selectedBookmarkPosition) {  // The current bookmark is the selected bookmark.
 370                                 // Move the current bookmark down one.
 371                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i + 1);
 372                             } else if ((i - 1) == selectedBookmarkPosition) {  // The current bookmark is immediately below the selected bookmark.
 373                                 // Move the bookmark below the selected bookmark up one.
 374                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i - 1);
 375                             } else {  // The current bookmark is not changing positions.
 376                                 // Move `bookmarksCursor` to the current bookmark position.
 377                                 bookmarksCursor.moveToPosition(i);
 378
 379                                 // Update the display order only if it is not correct in the database.
 380                                 if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
 381                                     bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
 382                                 }
 383                             }
 384                         }
 385
 386                         // Update the bookmarks cursor with the current contents of the bookmarks database.
 387                         bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolder);
 388
 389                         // Update the `ListView`.
 390                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 391
 392                         // Scroll with the bookmark.
 393                         scrollBookmarks(selectedBookmarkNewPosition);
 394
 395                         // Update the enabled status of the move icons.
 396                         updateMoveIcons();
 397                         break;
 398
 399                     case R.id.move_to_folder:
 400                         // Store `checkedItemIds` for use by the `AlertDialog`.
 401                         checkedItemIds = bookmarksListView.getCheckedItemIds();
 402
 403                         // Show the `MoveToFolderDialog` `AlertDialog` and name the instance `@string/move_to_folder
 404                         DialogFragment moveToFolderDialog = new MoveToFolderDialog();
 405                         moveToFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.move_to_folder));
 406                         break;
 407
 408                     case R.id.edit_bookmark:
 409                         // Get the array of checked bookmark positions.
 410                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
 411
 412                         // Get the position of the selected bookmark.  Only one bookmark is selected when `edit_bookmark_down` is enabled.
 413                         selectedBookmarkPosition = selectedBookmarksPositionsSparseBooleanArray.keyAt(0);
 414
 415                         // Move the `Cursor` to the selected position and find out if it is a folder.
 416                         bookmarksCursor.moveToPosition(selectedBookmarkPosition);
 417                         boolean isFolder = (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1);
 418
 419                         // Get the selected bookmark database ID.
 420                         int databaseId = bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper._ID));
 421
 422                         // Show the edit bookmark or edit bookmark folder dialog.
 423                         if (isFolder) {
 424                             // Save the current folder name, which is used in `onSaveBookmarkFolder()`.
 425                             oldFolderNameString = bookmarksCursor.getString(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 426
 427                             // Show the edit bookmark folder dialog.
 428                             DialogFragment editFolderDialog = EditBookmarkFolderDialog.folderDatabaseId(databaseId);
 429                             editFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_folder));
 430                         } else {
 431                             // Show the edit bookmark dialog.
 432                             DialogFragment editBookmarkDialog = EditBookmarkDialog.bookmarkDatabaseId(databaseId);
 433                             editBookmarkDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_bookmark));
 434                         }
 435                         break;
 436
 437                     case R.id.delete_bookmark:
 438                         // Set the deleting bookmarks flag, which prevents the delete menu item from being enabled until the current process finishes.
 439                         deletingBookmarks = true;
 440
 441                         // Get an array of the selected row IDs.
 442                         final long[] selectedBookmarksIdsLongArray = bookmarksListView.getCheckedItemIds();
 443
 444                         // Get an array of checked bookmarks.  `.clone()` makes a copy that won't change if the list view is reloaded, which is needed for re-selecting the bookmarks on undelete.
 445                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions().clone();
 446
 447                         // Update the bookmarks cursor with the current contents of the bookmarks database except for the specified database IDs.
 448                         bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrderExcept(selectedBookmarksIdsLongArray, currentFolder);
 449
 450                         // Update the list view.
 451                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 452
 453                         // Show a Snackbar with the number of deleted bookmarks.
 454                         bookmarksDeletedSnackbar = Snackbar.make(findViewById(R.id.bookmarks_coordinatorlayout), getString(R.string.bookmarks_deleted) + "  " + selectedBookmarksIdsLongArray.length,
 455                                 Snackbar.LENGTH_LONG)
 456                                 .setAction(R.string.undo, view -> {
 457                                     // Do nothing because everything will be handled by `onDismissed()` below.
 458                                 })
 459                                 .addCallback(new Snackbar.Callback() {
 460                                     @SuppressLint("SwitchIntDef")  // Ignore the lint warning about not handling the other possible events as they are covered by `default:`.
 461                                     @Override
 462                                     public void onDismissed(Snackbar snackbar, int event) {
 463                                         switch (event) {
 464                                             // The user pushed the `Undo` button.
 465                                             case Snackbar.Callback.DISMISS_EVENT_ACTION:
 466                                                 // Update the bookmarks cursor with the current contents of the bookmarks database, including the "deleted" bookmarks.
 467                                                 bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolder);
 468
 469                                                 // Update the list view.
 470                                                 bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 471
 472                                                 // Re-select the previously selected bookmarks.
 473                                                 for (int i = 0; i < selectedBookmarksPositionsSparseBooleanArray.size(); i++) {
 474                                                     bookmarksListView.setItemChecked(selectedBookmarksPositionsSparseBooleanArray.keyAt(i), true);
 475                                                 }
 476                                                 break;
 477
 478                                             // The Snackbar was dismissed without the `Undo` button being pushed.
 479                                             default:
 480                                                 // Delete each selected bookmark.
 481                                                 for (long databaseIdLong : selectedBookmarksIdsLongArray) {
 482                                                     // Convert `databaseIdLong` to an int.
 483                                                     int databaseIdInt = (int) databaseIdLong;
 484
 485                                                     // Delete the contents of the folder if the selected bookmark is a folder.
 486                                                     if (bookmarksDatabaseHelper.isFolder(databaseIdInt)) {
 487                                                         deleteBookmarkFolderContents(databaseIdInt);
 488                                                     }
 489
 490                                                     // Delete the selected bookmark.
 491                                                     bookmarksDatabaseHelper.deleteBookmark(databaseIdInt);
 492                                                 }
 493
 494                                                 // Update the display order.
 495                                                 for (int i = 0; i < bookmarksListView.getCount(); i++) {
 496                                                     // Get the database ID for the current bookmark.
 497                                                     int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 498
 499                                                     // Move `bookmarksCursor` to the current bookmark position.
 500                                                     bookmarksCursor.moveToPosition(i);
 501
 502                                                     // Update the display order only if it is not correct in the database.
 503                                                     if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
 504                                                         bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
 505                                                     }
 506                                                 }
 507                                         }
 508
 509                                         // Reset the deleting bookmarks flag.
 510                                         deletingBookmarks = false;
 511
 512                                         // Enable the delete bookmarks menu item.
 513                                         deleteBookmarksMenuItem.setEnabled(true);
 514
 515                                         // Close the activity if back has been pressed.
 516                                         if (closeActivityAfterDismissingSnackbar) {
 517                                             onBackPressed();
 518                                         }
 519                                     }
 520                                 });
 521
 522                         //Show the Snackbar.
 523                         bookmarksDeletedSnackbar.show();
 524                         break;
 525
 526                     case R.id.context_menu_select_all_bookmarks:
 527                         // Get the total number of bookmarks.
 528                         int numberOfBookmarks = bookmarksListView.getCount();
 529
 530                         // Select them all.
 531                         for (int i = 0; i < numberOfBookmarks; i++) {
 532                             bookmarksListView.setItemChecked(i, true);
 533                         }
 534                         break;
 535                 }
 536
 537                 // Consume the click.
 538                 return true;
 539             }
 540
 541             @Override
 542             public void onDestroyActionMode(ActionMode mode) {
 543                 // Do nothing.
 544             }
 545         });
 546
 547         // Get handles for the `FloatingActionButtons`.
 548         FloatingActionButton createBookmarkFolderFab = findViewById(R.id.create_bookmark_folder_fab);
 549         FloatingActionButton createBookmarkFab = findViewById(R.id.create_bookmark_fab);
 550
 551         // Set the create new bookmark folder FAB to display the `AlertDialog`.
 552         createBookmarkFolderFab.setOnClickListener(v -> {
 553             // Show the `CreateBookmarkFolderDialog` `AlertDialog` and name the instance `@string/create_folder`.
 554             DialogFragment createBookmarkFolderDialog = new CreateBookmarkFolderDialog();
 555             createBookmarkFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.create_folder));
 556         });
 557
 558         // Set the create new bookmark FAB to display the `AlertDialog`.
 559         createBookmarkFab.setOnClickListener(view -> {
 560             // Instantiate the create bookmark dialog.
 561             DialogFragment createBookmarkDialog = CreateBookmarkDialog.createBookmark(currentWebViewUrl, currentWebViewTitle, MainWebViewActivity.favoriteIconBitmap);
 562
 563             // Display the create bookmark dialog.
 564             createBookmarkDialog.show(getSupportFragmentManager(), getResources().getString(R.string.create_bookmark));
 565         });
 566     }
 567
 568     @Override
 569     public void onRestart() {
 570         // Run the default commands.
 571         super.onRestart();
 572
 573         // Update the list view if returning from the bookmarks database view activity.
 574         if (restartFromBookmarksDatabaseViewActivity) {
 575             // Load the current folder in the list view.
 576             loadFolder();
 577
 578             // Reset `restartFromBookmarksDatabaseViewActivity`.
 579             restartFromBookmarksDatabaseViewActivity = false;
 580         }
 581     }
 582
 583     @Override
 584     public boolean onCreateOptionsMenu(Menu menu) {
 585         // Inflate the menu.
 586         getMenuInflater().inflate(R.menu.bookmarks_options_menu, menu);
 587
 588         // Success.
 589         return true;
 590     }
 591
 592     @Override
 593     public boolean onOptionsItemSelected(MenuItem menuItem) {
 594         switch (menuItem.getItemId()) {
 595             case android.R.id.home:  // The home arrow is identified as `android.R.id.home`, not just `R.id.home`.
 596                 if (currentFolder.isEmpty()) {  // Currently in the home folder.
 597                     // Run the back commands.
 598                     onBackPressed();
 599                 } else {  // Currently in a subfolder.
 600                     // Place the former parent folder in `currentFolder`.
 601                     currentFolder = bookmarksDatabaseHelper.getParentFolderName(currentFolder);
 602
 603                     // Load the new folder.
 604                     loadFolder();
 605                 }
 606                 break;
 607
 608             case R.id.options_menu_select_all_bookmarks:
 609                 // Get the total number of bookmarks.
 610                 int numberOfBookmarks = bookmarksListView.getCount();
 611
 612                 // Select them all.
 613                 for (int i = 0; i < numberOfBookmarks; i++) {
 614                     bookmarksListView.setItemChecked(i, true);
 615                 }
 616                 break;
 617
 618             case R.id.bookmarks_database_view:
 619                 // Launch `BookmarksDatabaseViewActivity`.
 620                 Intent bookmarksDatabaseViewIntent = new Intent(this, BookmarksDatabaseViewActivity.class);
 621                 startActivity(bookmarksDatabaseViewIntent);
 622                 break;
 623         }
 624         return true;
 625     }
 626
 627     @Override
 628     public void onBackPressed() {
 629         // Check to see if a snackbar is currently displayed.  If so, it must be closed before exiting so that a pending delete is completed before reloading the list view in the bookmarks drawer.
 630         if ((bookmarksDeletedSnackbar != null) && bookmarksDeletedSnackbar.isShown()) {  // Close the bookmarks deleted snackbar before going home.
 631             // Set the close flag.
 632             closeActivityAfterDismissingSnackbar = true;
 633
 634             // Dismiss the snackbar.
 635             bookmarksDeletedSnackbar.dismiss();
 636         } else {  // Go home immediately.
 637             // Update the bookmarks folder for the bookmarks drawer in the main WebView activity.
 638             MainWebViewActivity.currentBookmarksFolder = currentFolder;
 639
 640             // Close the bookmarks drawer and reload the bookmarks ListView when returning to the main WebView activity.
 641             MainWebViewActivity.restartFromBookmarksActivity = true;
 642
 643             // Exit the bookmarks activity.
 644             super.onBackPressed();
 645         }
 646     }
 647
 648     @Override
 649     public void onCreateBookmark(DialogFragment dialogFragment) {
 650         // Get the views from the dialog fragment.
 651         EditText createBookmarkNameEditText = dialogFragment.getDialog().findViewById(R.id.create_bookmark_name_edittext);
 652         EditText createBookmarkUrlEditText = dialogFragment.getDialog().findViewById(R.id.create_bookmark_url_edittext);
 653
 654         // Extract the strings from the edit texts.
 655         String bookmarkNameString = createBookmarkNameEditText.getText().toString();
 656         String bookmarkUrlString = createBookmarkUrlEditText.getText().toString();
 657
 658         // Get a copy of the favorite icon bitmap.
 659         Bitmap favoriteIcon = MainWebViewActivity.favoriteIconBitmap;
 660
 661         // Scale the favorite icon bitmap down if it is larger than 256 x 256.  Filtering uses bilinear interpolation.
 662         if ((favoriteIcon.getHeight() > 256) || (favoriteIcon.getWidth() > 256)) {
 663             favoriteIcon = Bitmap.createScaledBitmap(favoriteIcon, 256, 256, true);
 664         }
 665
 666         // Create a favorite icon byte array output stream.
 667         ByteArrayOutputStream favoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
 668
 669         // Convert the favorite icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
 670         favoriteIcon.compress(Bitmap.CompressFormat.PNG, 0, favoriteIconByteArrayOutputStream);
 671
 672         // Convert the favorite icon byte array stream to a byte array.
 673         byte[] favoriteIconByteArray = favoriteIconByteArrayOutputStream.toByteArray();
 674
 675         // Display the new bookmark below the current items in the (0 indexed) list.
 676         int newBookmarkDisplayOrder = bookmarksListView.getCount();
 677
 678         // Create the bookmark.
 679         bookmarksDatabaseHelper.createBookmark(bookmarkNameString, bookmarkUrlString, currentFolder, newBookmarkDisplayOrder, favoriteIconByteArray);
 680
 681         // Update the bookmarks cursor with the current contents of this folder.
 682         bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolder);
 683
 684         // Update the `ListView`.
 685         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 686
 687         // Scroll to the new bookmark.
 688         bookmarksListView.setSelection(newBookmarkDisplayOrder);
 689     }
 690
 691     @Override
 692     public void onCreateBookmarkFolder(DialogFragment dialogFragment) {
 693         // Get handles for the views in the dialog fragment.
 694         EditText createFolderNameEditText = dialogFragment.getDialog().findViewById(R.id.create_folder_name_edittext);
 695         RadioButton defaultFolderIconRadioButton = dialogFragment.getDialog().findViewById(R.id.create_folder_default_icon_radiobutton);
 696         ImageView folderIconImageView = dialogFragment.getDialog().findViewById(R.id.create_folder_default_icon);
 697
 698         // Get new folder name string.
 699         String folderNameString = createFolderNameEditText.getText().toString();
 700
 701         // Create a folder icon bitmap.
 702         Bitmap folderIconBitmap;
 703
 704         // Set the folder icon bitmap according to the dialog.
 705         if (defaultFolderIconRadioButton.isChecked()) {  // Use the default folder icon.
 706             // Get the default folder icon drawable.
 707             Drawable folderIconDrawable = folderIconImageView.getDrawable();
 708
 709             // Convert the folder icon drawable to a bitmap drawable.
 710             BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 711
 712             // Convert the folder icon bitmap drawable to a bitmap.
 713             folderIconBitmap = folderIconBitmapDrawable.getBitmap();
 714         } else {  // Use the WebView favorite icon.
 715             // Get a copy of the favorite icon bitmap.
 716             folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 717
 718             // Scale the folder icon bitmap down if it is larger than 256 x 256.  Filtering uses bilinear interpolation.
 719             if ((folderIconBitmap.getHeight() > 256) || (folderIconBitmap.getWidth() > 256)) {
 720                 folderIconBitmap = Bitmap.createScaledBitmap(folderIconBitmap, 256, 256, true);
 721             }
 722         }
 723
 724         // Create a folder icon byte array output stream.
 725         ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
 726
 727         // Convert the folder icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
 728         folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
 729
 730         // Convert the folder icon byte array stream to a byte array.
 731         byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
 732
 733         // Move all the bookmarks down one in the display order.
 734         for (int i = 0; i < bookmarksListView.getCount(); i++) {
 735             int databaseId = (int) bookmarksListView.getItemIdAtPosition(i);
 736             bookmarksDatabaseHelper.updateDisplayOrder(databaseId, i + 1);
 737         }
 738
 739         // Create the folder, which will be placed at the top of the `ListView`.
 740         bookmarksDatabaseHelper.createFolder(folderNameString, currentFolder, folderIconByteArray);
 741
 742         // Update the bookmarks cursor with the current contents of this folder.
 743         bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolder);
 744
 745         // Update the `ListView`.
 746         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 747
 748         // Scroll to the new folder.
 749         bookmarksListView.setSelection(0);
 750     }
 751
 752     @Override
 753     public void onSaveBookmark(DialogFragment dialogFragment, int selectedBookmarkDatabaseId) {
 754         // Get handles for the views from `dialogFragment`.
 755         EditText editBookmarkNameEditText = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_name_edittext);
 756         EditText editBookmarkUrlEditText = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_url_edittext);
 757         RadioButton currentBookmarkIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_current_icon_radiobutton);
 758
 759         // Store the bookmark strings.
 760         String bookmarkNameString = editBookmarkNameEditText.getText().toString();
 761         String bookmarkUrlString = editBookmarkUrlEditText.getText().toString();
 762
 763         // Update the bookmark.
 764         if (currentBookmarkIconRadioButton.isChecked()) {  // Update the bookmark without changing the favorite icon.
 765             bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString);
 766         } else {  // Update the bookmark using the `WebView` favorite icon.
 767             // Get a copy of the favorite icon bitmap.
 768             Bitmap favoriteIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 769
 770             // Scale the favorite icon bitmap down if it is larger than 256 x 256.  Filtering uses bilinear interpolation.
 771             if ((favoriteIconBitmap.getHeight() > 256) || (favoriteIconBitmap.getWidth() > 256)) {
 772                 favoriteIconBitmap = Bitmap.createScaledBitmap(favoriteIconBitmap, 256, 256, true);
 773             }
 774
 775             // Create a favorite icon byte array output stream.
 776             ByteArrayOutputStream newFavoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
 777
 778             // Convert the favorite icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
 779             favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFavoriteIconByteArrayOutputStream);
 780
 781             // Convert the favorite icon byte array stream to a byte array.
 782             byte[] newFavoriteIconByteArray = newFavoriteIconByteArrayOutputStream.toByteArray();
 783
 784             //  Update the bookmark and the favorite icon.
 785             bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString, newFavoriteIconByteArray);
 786         }
 787
 788         // Close the contextual action mode.
 789         contextualActionMode.finish();
 790
 791         // Update the bookmarks cursor with the contents of the current folder.
 792         bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolder);
 793
 794         // Update the `ListView`.
 795         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 796     }
 797
 798     @Override
 799     public void onSaveBookmarkFolder(DialogFragment dialogFragment, int selectedFolderDatabaseId) {
 800         // Get handles for the views from `dialogFragment`.
 801         RadioButton currentFolderIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_folder_current_icon_radiobutton);
 802         RadioButton defaultFolderIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon_radiobutton);
 803         ImageView defaultFolderIconImageView = dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon_imageview);
 804         EditText editFolderNameEditText = dialogFragment.getDialog().findViewById(R.id.edit_folder_name_edittext);
 805
 806         // Get the new folder name.
 807         String newFolderNameString = editFolderNameEditText.getText().toString();
 808
 809         // Check if the favorite icon has changed.
 810         if (currentFolderIconRadioButton.isChecked()) {  // Only the name has changed.
 811             // Update the name in the database.
 812             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, oldFolderNameString, newFolderNameString);
 813         } else if (!currentFolderIconRadioButton.isChecked() && newFolderNameString.equals(oldFolderNameString)) {  // Only the icon has changed.
 814             // Create the new folder icon Bitmap.
 815             Bitmap folderIconBitmap;
 816
 817             // Populate the new folder icon bitmap.
 818             if (defaultFolderIconRadioButton.isChecked()) {
 819                 // Get the default folder icon drawable.
 820                 Drawable folderIconDrawable = defaultFolderIconImageView.getDrawable();
 821
 822                 // Convert the folder icon drawable to a bitmap drawable.
 823                 BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 824
 825                 // Convert the folder icon bitmap drawable to a bitmap.
 826                 folderIconBitmap = folderIconBitmapDrawable.getBitmap();
 827             } else {  // Use the WebView favorite icon.
 828                 // Get a copy of the favorite icon bitmap.
 829                 folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 830
 831                 // Scale the folder icon bitmap down if it is larger than 256 x 256.  Filtering uses bilinear interpolation.
 832                 if ((folderIconBitmap.getHeight() > 256) || (folderIconBitmap.getWidth() > 256)) {
 833                     folderIconBitmap = Bitmap.createScaledBitmap(folderIconBitmap, 256, 256, true);
 834                 }
 835             }
 836
 837             // Create a folder icon byte array output stream.
 838             ByteArrayOutputStream newFolderIconByteArrayOutputStream = new ByteArrayOutputStream();
 839
 840             // Convert the folder icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
 841             folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFolderIconByteArrayOutputStream);
 842
 843             // Convert the folder icon byte array stream to a byte array.
 844             byte[] newFolderIconByteArray = newFolderIconByteArrayOutputStream.toByteArray();
 845
 846             // Update the folder icon in the database.
 847             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, newFolderIconByteArray);
 848         } else {  // The folder icon and the name have changed.
 849             // Instantiate the new folder icon `Bitmap`.
 850             Bitmap folderIconBitmap;
 851
 852             // Populate the new folder icon bitmap.
 853             if (defaultFolderIconRadioButton.isChecked()) {
 854                 // Get the default folder icon drawable.
 855                 Drawable folderIconDrawable = defaultFolderIconImageView.getDrawable();
 856
 857                 // Convert the folder icon drawable to a bitmap drawable.
 858                 BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 859
 860                 // Convert the folder icon bitmap drawable to a bitmap.
 861                 folderIconBitmap = folderIconBitmapDrawable.getBitmap();
 862             } else {  // Use the WebView favorite icon.
 863                 // Get a copy of the favorite icon bitmap.
 864                 folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 865
 866                 // Scale the folder icon bitmap down if it is larger than 256 x 256.  Filtering uses bilinear interpolation.
 867                 if ((folderIconBitmap.getHeight() > 256) || (folderIconBitmap.getWidth() > 256)) {
 868                     folderIconBitmap = Bitmap.createScaledBitmap(folderIconBitmap, 256, 256, true);
 869                 }
 870             }
 871
 872             // Create a folder icon byte array output stream.
 873             ByteArrayOutputStream newFolderIconByteArrayOutputStream = new ByteArrayOutputStream();
 874
 875             // Convert the folder icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
 876             folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFolderIconByteArrayOutputStream);
 877
 878             // Convert the folder icon byte array stream to a byte array.
 879             byte[] newFolderIconByteArray = newFolderIconByteArrayOutputStream.toByteArray();
 880
 881             // Update the folder name and icon in the database.
 882             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, oldFolderNameString, newFolderNameString, newFolderIconByteArray);
 883         }
 884
 885         // Update the bookmarks cursor with the current contents of this folder.
 886         bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolder);
 887
 888         // Update the `ListView`.
 889         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 890
 891         // Close the contextual action mode.
 892         contextualActionMode.finish();
 893     }
 894
 895     @Override
 896     public void onMoveToFolder(DialogFragment dialogFragment) {
 897         // Get a handle for the `ListView` from `dialogFragment`.
 898         ListView folderListView = dialogFragment.getDialog().findViewById(R.id.move_to_folder_listview);
 899
 900         // Store a long array of the selected folders.
 901         long[] newFolderLongArray = folderListView.getCheckedItemIds();
 902
 903         // Get the new folder database ID.  Only one folder will be selected.
 904         int newFolderDatabaseId = (int) newFolderLongArray[0];
 905
 906         // Instantiate `newFolderName`.
 907         String newFolderName;
 908
 909         // Set the new folder name.
 910         if (newFolderDatabaseId == 0) {
 911             // The new folder is the home folder, represented as `""` in the database.
 912             newFolderName = "";
 913         } else {
 914             // Get the new folder name from the database.
 915             newFolderName = bookmarksDatabaseHelper.getFolderName(newFolderDatabaseId);
 916         }
 917
 918         // Get a long array with the the database ID of the selected bookmarks.
 919         long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
 920
 921         // Move each of the selected bookmarks to the new folder.
 922         for (long databaseIdLong : selectedBookmarksLongArray) {
 923             // Get `databaseIdInt` for each selected bookmark.
 924             int databaseIdInt = (int) databaseIdLong;
 925
 926             // Move the selected bookmark to the new folder.
 927             bookmarksDatabaseHelper.moveToFolder(databaseIdInt, newFolderName);
 928         }
 929
 930         // Update the bookmarks cursor with the current contents of this folder.
 931         bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolder);
 932
 933         // Update the `ListView`.
 934         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 935
 936         // Close the contextual app bar.
 937         contextualActionMode.finish();
 938     }
 939
 940     private void deleteBookmarkFolderContents(int databaseId) {
 941         // Get the name of the folder.
 942         String folderName = bookmarksDatabaseHelper.getFolderName(databaseId);
 943
 944         // Get the contents of the folder.
 945         Cursor folderCursor = bookmarksDatabaseHelper.getBookmarkIDs(folderName);
 946
 947         // Delete each of the bookmarks in the folder.
 948         for (int i = 0; i < folderCursor.getCount(); i++) {
 949             // Move `folderCursor` to the current row.
 950             folderCursor.moveToPosition(i);
 951
 952             // Get the database ID of the item.
 953             int itemDatabaseId = folderCursor.getInt(folderCursor.getColumnIndex(BookmarksDatabaseHelper._ID));
 954
 955             // If this is a folder, recursively delete the contents first.
 956             if (bookmarksDatabaseHelper.isFolder(itemDatabaseId)) {
 957                 deleteBookmarkFolderContents(itemDatabaseId);
 958             }
 959
 960             // Delete the bookmark.
 961             bookmarksDatabaseHelper.deleteBookmark(itemDatabaseId);
 962         }
 963     }
 964
 965     private void updateMoveIcons() {
 966         // Get a long array of the selected bookmarks.
 967         long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
 968
 969         // Get the database IDs for the first, last, and selected bookmarks.
 970         int selectedBookmarkDatabaseId = (int) selectedBookmarksLongArray[0];
 971         int firstBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(0);
 972         // bookmarksListView is 0 indexed.
 973         int lastBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(bookmarksListView.getCount() - 1);
 974
 975         // Update the move bookmark up `MenuItem`.
 976         if (selectedBookmarkDatabaseId == firstBookmarkDatabaseId) {  // The selected bookmark is in the first position.
 977             // Disable the move bookmark up `MenuItem`.
 978             moveBookmarkUpMenuItem.setEnabled(false);
 979
 980             //  Set the move bookmark up icon to be ghosted.
 981             moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_disabled);
 982         } else {  // The selected bookmark is not in the first position.
 983             // Enable the move bookmark up `MenuItem`.
 984             moveBookmarkUpMenuItem.setEnabled(true);
 985
 986             // Set the icon according to the theme.
 987             if (MainWebViewActivity.darkTheme) {
 988                 moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_enabled_dark);
 989             } else {
 990                 moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_enabled_light);
 991             }
 992         }
 993
 994         // Update the move bookmark down `MenuItem`.
 995         if (selectedBookmarkDatabaseId == lastBookmarkDatabaseId) {  // The selected bookmark is in the last position.
 996             // Disable the move bookmark down `MenuItem`.
 997             moveBookmarkDownMenuItem.setEnabled(false);
 998
 999             // Set the move bookmark down icon to be ghosted.
1000             moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_disabled);
1001         } else {  // The selected bookmark is not in the last position.
1002             // Enable the move bookmark down `MenuItem`.
1003             moveBookmarkDownMenuItem.setEnabled(true);
1004
1005             // Set the icon according to the theme.
1006             if (MainWebViewActivity.darkTheme) {
1007                 moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_enabled_dark);
1008             } else {
1009                 moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_enabled_light);
1010             }
1011         }
1012     }
1013
1014     private void scrollBookmarks(int selectedBookmarkPosition) {
1015         // Get the first and last visible bookmark positions.
1016         int firstVisibleBookmarkPosition = bookmarksListView.getFirstVisiblePosition();
1017         int lastVisibleBookmarkPosition = bookmarksListView.getLastVisiblePosition();
1018
1019         // Calculate the number of bookmarks per screen.
1020         int numberOfBookmarksPerScreen = lastVisibleBookmarkPosition - firstVisibleBookmarkPosition;
1021
1022         // Scroll with the moved bookmark if necessary.
1023         if (selectedBookmarkPosition <= firstVisibleBookmarkPosition) {  // The selected bookmark position is at or above the top of the screen.
1024             // Scroll to the selected bookmark position.
1025             bookmarksListView.setSelection(selectedBookmarkPosition);
1026         } else if (selectedBookmarkPosition >= (lastVisibleBookmarkPosition - 1)) {  // The selected bookmark is at or below the bottom of the screen.
1027             // The `-1` handles partial bookmarks displayed at the bottom of the list view.  This command scrolls to display the selected bookmark at the bottom of the screen.
1028             // `+1` assures that the entire bookmark will be displayed in situations where only a partial bookmark fits at the bottom of the list view.
1029             bookmarksListView.setSelection(selectedBookmarkPosition - numberOfBookmarksPerScreen + 1);
1030         }
1031     }
1032
1033     private void loadFolder() {
1034         // Update bookmarks cursor with the contents of the bookmarks database for the current folder.
1035         bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolder);
1036
1037         // Setup a `CursorAdapter`.  `this` specifies the `Context`.  `false` disables `autoRequery`.
1038         bookmarksCursorAdapter = new CursorAdapter(this, bookmarksCursor, false) {
1039             @Override
1040             public View newView(Context context, Cursor cursor, ViewGroup parent) {
1041                 // Inflate the individual item layout.  `false` does not attach it to the root.
1042                 return getLayoutInflater().inflate(R.layout.bookmarks_activity_item_linearlayout, parent, false);
1043             }
1044
1045             @Override
1046             public void bindView(View view, Context context, Cursor cursor) {
1047                 // Get handles for the views.
1048                 ImageView bookmarkFavoriteIcon = view.findViewById(R.id.bookmark_favorite_icon);
1049                 TextView bookmarkNameTextView = view.findViewById(R.id.bookmark_name);
1050
1051                 // Get the favorite icon byte array from the `Cursor`.
1052                 byte[] favoriteIconByteArray = cursor.getBlob(cursor.getColumnIndex(BookmarksDatabaseHelper.FAVORITE_ICON));
1053
1054                 // Convert the byte array to a `Bitmap` beginning at the first byte and ending at the last.
1055                 Bitmap favoriteIconBitmap = BitmapFactory.decodeByteArray(favoriteIconByteArray, 0, favoriteIconByteArray.length);
1056
1057                 // Display the bitmap in `bookmarkFavoriteIcon`.
1058                 bookmarkFavoriteIcon.setImageBitmap(favoriteIconBitmap);
1059
1060                 // Get the bookmark name from the cursor and display it in `bookmarkNameTextView`.
1061                 String bookmarkNameString = cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
1062                 bookmarkNameTextView.setText(bookmarkNameString);
1063
1064                 // Make the font bold for folders.
1065                 if (cursor.getInt(cursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1) {
1066                     bookmarkNameTextView.setTypeface(Typeface.DEFAULT_BOLD);
1067                 } else {  // Reset the font to default for normal bookmarks.
1068                     bookmarkNameTextView.setTypeface(Typeface.DEFAULT);
1069                 }
1070             }
1071         };
1072
1073         // Populate the list view with the adapter.
1074         bookmarksListView.setAdapter(bookmarksCursorAdapter);
1075
1076         // Set the `AppBar` title.
1077         if (currentFolder.isEmpty()) {
1078             appBar.setTitle(R.string.bookmarks);
1079         } else {
1080             appBar.setTitle(currentFolder);
1081         }
1082     }
1083
1084     @Override
1085     public void onDestroy() {
1086         // Close the bookmarks cursor and database.
1087         bookmarksCursor.close();
1088         bookmarksDatabaseHelper.close();
1089
1090         // Run the default commands.
1091         super.onDestroy();
1092     }
1093 }