Release 2.17.1.
[PrivacyBrowser.git] / 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.database.CursorWindow;
28 import android.database.sqlite.SQLiteCursor;
29 import android.graphics.Bitmap;
30 import android.graphics.BitmapFactory;
31 import android.graphics.Typeface;
32 import android.graphics.drawable.BitmapDrawable;
33 import android.graphics.drawable.Drawable;
34 import android.os.Build;
35 import android.os.Bundle;
36 import android.util.SparseBooleanArray;
37 import android.view.ActionMode;
38 import android.view.Menu;
39 import android.view.MenuItem;
40 import android.view.View;
41 import android.view.ViewGroup;
42 import android.view.WindowManager;
43 import android.widget.AbsListView;
44 import android.widget.CursorAdapter;
45 import android.widget.EditText;
46 import android.widget.ImageView;
47 import android.widget.ListView;
48 import android.widget.RadioButton;
49 import android.widget.TextView;
50
51 import androidx.appcompat.app.ActionBar;
52 import androidx.appcompat.app.AppCompatActivity;
53 import androidx.appcompat.widget.Toolbar;  // The AndroidX toolbar must be used until the minimum API is >= 21.
54 import androidx.core.app.NavUtils;
55 import androidx.fragment.app.DialogFragment;
56
57 import com.google.android.material.floatingactionbutton.FloatingActionButton;
58 import com.google.android.material.snackbar.Snackbar;
59
60 import com.stoutner.privacybrowser.dialogs.CreateBookmarkDialog;
61 import com.stoutner.privacybrowser.dialogs.CreateBookmarkFolderDialog;
62 import com.stoutner.privacybrowser.dialogs.EditBookmarkDialog;
63 import com.stoutner.privacybrowser.dialogs.EditBookmarkFolderDialog;
64 import com.stoutner.privacybrowser.dialogs.MoveToFolderDialog;
65 import com.stoutner.privacybrowser.R;
66 import com.stoutner.privacybrowser.helpers.BookmarksDatabaseHelper;
67
68 import java.io.ByteArrayOutputStream;
69
70 public class BookmarksActivity extends AppCompatActivity implements CreateBookmarkDialog.CreateBookmarkListener, CreateBookmarkFolderDialog.CreateBookmarkFolderListener, EditBookmarkDialog.EditBookmarkListener,
71         EditBookmarkFolderDialog.EditBookmarkFolderListener, MoveToFolderDialog.MoveToFolderListener {
72
73     // `currentFolder` is public static so it can be accessed from `MoveToFolderDialog` and `BookmarksDatabaseViewActivity`.
74     // It is used in `onCreate`, `onOptionsItemSelected()`, `onBackPressed()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`,
75     // and `loadFolder()`.
76     public static String currentFolder;
77
78     // `checkedItemIds` is public static so it can be accessed from `MoveToFolderDialog`.  It is also used in `onCreate()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`,
79     // and `updateMoveIcons()`.
80     public static long[] checkedItemIds;
81
82     // `restartFromBookmarksDatabaseViewActivity` is public static so it can be accessed from `BookmarksDatabaseViewActivity`.  It is also used in `onRestart()`.
83     public static boolean restartFromBookmarksDatabaseViewActivity;
84
85
86     // `bookmarksDatabaseHelper` is used in `onCreate()`, `onOptionsItemSelected()`, `onBackPressed()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`,
87     // `onMoveToFolder()`, `deleteBookmarkFolderContents()`, `loadFolder()`, and `onDestroy()`.
88     private BookmarksDatabaseHelper bookmarksDatabaseHelper;
89
90     // `bookmarksListView` is used in `onCreate()`, `onOptionsItemSelected()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`,
91     // `updateMoveIcons()`, `scrollBookmarks()`, and `loadFolder()`.
92     private ListView bookmarksListView;
93
94     // `bookmarksCursor` is used in `onCreate()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`, `deleteBookmarkFolderContents()`,
95     // `loadFolder()`, and `onDestroy()`.
96     // TODO This should be switched back to a `Cursor` after the release of 2.17.1.
97     private SQLiteCursor 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                         // TODO Change this back to a `Cursor` after 2.17.1 is released.
342                         bookmarksCursor = (SQLiteCursor) bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolder);
343
344                         // Update the `ListView`.
345                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
346
347                         // Scroll with the bookmark.
348                         scrollBookmarks(selectedBookmarkNewPosition);
349
350                         // Update the enabled status of the move icons.
351                         updateMoveIcons();
352                         break;
353
354                     case R.id.move_bookmark_down:
355                         // Get the array of checked bookmark positions.
356                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
357
358                         // Store the position of the selected bookmark.  Only one bookmark is selected when `move_bookmark_down` is enabled.
359                         selectedBookmarkPosition = selectedBookmarksPositionsSparseBooleanArray.keyAt(0);
360
361                         // Calculate the new position of the selected bookmark.
362                         selectedBookmarkNewPosition = selectedBookmarkPosition + 1;
363
364                         // Iterate through the bookmarks.
365                         for (int i = 0; i <bookmarksListView.getCount(); i++) {
366                             // Get the database ID for the current bookmark.
367                             int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
368
369                             // Update the display order for the current bookmark.
370                             if (i == selectedBookmarkPosition) {  // The current bookmark is the selected bookmark.
371                                 // Move the current bookmark down one.
372                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i + 1);
373                             } else if ((i - 1) == selectedBookmarkPosition) {  // The current bookmark is immediately below the selected bookmark.
374                                 // Move the bookmark below the selected bookmark up one.
375                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i - 1);
376                             } else {  // The current bookmark is not changing positions.
377                                 // Move `bookmarksCursor` to the current bookmark position.
378                                 bookmarksCursor.moveToPosition(i);
379
380                                 // Update the display order only if it is not correct in the database.
381                                 if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
382                                     bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
383                                 }
384                             }
385                         }
386
387                         // Update the bookmarks cursor with the current contents of the bookmarks database.
388                         // TODO Change this back to a `Cursor` after 2.17.1 is released.
389                         bookmarksCursor = (SQLiteCursor) bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolder);
390
391                         // Update the `ListView`.
392                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
393
394                         // Scroll with the bookmark.
395                         scrollBookmarks(selectedBookmarkNewPosition);
396
397                         // Update the enabled status of the move icons.
398                         updateMoveIcons();
399                         break;
400
401                     case R.id.move_to_folder:
402                         // Store `checkedItemIds` for use by the `AlertDialog`.
403                         checkedItemIds = bookmarksListView.getCheckedItemIds();
404
405                         // Show the `MoveToFolderDialog` `AlertDialog` and name the instance `@string/move_to_folder
406                         DialogFragment moveToFolderDialog = new MoveToFolderDialog();
407                         moveToFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.move_to_folder));
408                         break;
409
410                     case R.id.edit_bookmark:
411                         // Get the array of checked bookmark positions.
412                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
413
414                         // Get the position of the selected bookmark.  Only one bookmark is selected when `edit_bookmark_down` is enabled.
415                         selectedBookmarkPosition = selectedBookmarksPositionsSparseBooleanArray.keyAt(0);
416
417                         // Move the `Cursor` to the selected position and find out if it is a folder.
418                         bookmarksCursor.moveToPosition(selectedBookmarkPosition);
419                         boolean isFolder = (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1);
420
421                         // Get the selected bookmark database ID.
422                         int databaseId = bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper._ID));
423
424                         // Show the edit bookmark or edit bookmark folder dialog.
425                         if (isFolder) {
426                             // Save the current folder name, which is used in `onSaveBookmarkFolder()`.
427                             oldFolderNameString = bookmarksCursor.getString(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
428
429                             // Show the edit bookmark folder dialog.
430                             DialogFragment editFolderDialog = EditBookmarkFolderDialog.folderDatabaseId(databaseId);
431                             editFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_folder));
432                         } else {
433                             // Show the edit bookmark dialog.
434                             DialogFragment editBookmarkDialog = EditBookmarkDialog.bookmarkDatabaseId(databaseId);
435                             editBookmarkDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_bookmark));
436                         }
437                         break;
438
439                     case R.id.delete_bookmark:
440                         // Set the deleting bookmarks flag, which prevents the delete menu item from being enabled until the current process finishes.
441                         deletingBookmarks = true;
442
443                         // Get an array of the selected row IDs.
444                         final long[] selectedBookmarksIdsLongArray = bookmarksListView.getCheckedItemIds();
445
446                         // 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.
447                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions().clone();
448
449                         // Update the bookmarks cursor with the current contents of the bookmarks database except for the specified database IDs.
450                         // TODO Change this back to a `Cursor` after 2.17.1 is released.
451                         bookmarksCursor = (SQLiteCursor) bookmarksDatabaseHelper.getBookmarksByDisplayOrderExcept(selectedBookmarksIdsLongArray, currentFolder);
452
453                         // Update the list view.
454                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
455
456                         // Show a Snackbar with the number of deleted bookmarks.
457                         bookmarksDeletedSnackbar = Snackbar.make(findViewById(R.id.bookmarks_coordinatorlayout), getString(R.string.bookmarks_deleted) + "  " + selectedBookmarksIdsLongArray.length,
458                                 Snackbar.LENGTH_LONG)
459                                 .setAction(R.string.undo, view -> {
460                                     // Do nothing because everything will be handled by `onDismissed()` below.
461                                 })
462                                 .addCallback(new Snackbar.Callback() {
463                                     @SuppressLint("SwitchIntDef")  // Ignore the lint warning about not handling the other possible events as they are covered by `default:`.
464                                     @Override
465                                     public void onDismissed(Snackbar snackbar, int event) {
466                                         switch (event) {
467                                             // The user pushed the `Undo` button.
468                                             case Snackbar.Callback.DISMISS_EVENT_ACTION:
469                                                 // Update the bookmarks cursor with the current contents of the bookmarks database, including the "deleted" bookmarks.
470                                                 // TODO Change this back to a `Cursor` after 2.17.1 is released.
471                                                 bookmarksCursor = (SQLiteCursor) bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolder);
472
473                                                 // Update the list view.
474                                                 bookmarksCursorAdapter.changeCursor(bookmarksCursor);
475
476                                                 // Re-select the previously selected bookmarks.
477                                                 for (int i = 0; i < selectedBookmarksPositionsSparseBooleanArray.size(); i++) {
478                                                     bookmarksListView.setItemChecked(selectedBookmarksPositionsSparseBooleanArray.keyAt(i), true);
479                                                 }
480                                                 break;
481
482                                             // The Snackbar was dismissed without the `Undo` button being pushed.
483                                             default:
484                                                 // Delete each selected bookmark.
485                                                 for (long databaseIdLong : selectedBookmarksIdsLongArray) {
486                                                     // Convert `databaseIdLong` to an int.
487                                                     int databaseIdInt = (int) databaseIdLong;
488
489                                                     // Delete the contents of the folder if the selected bookmark is a folder.
490                                                     if (bookmarksDatabaseHelper.isFolder(databaseIdInt)) {
491                                                         deleteBookmarkFolderContents(databaseIdInt);
492                                                     }
493
494                                                     // Delete the selected bookmark.
495                                                     bookmarksDatabaseHelper.deleteBookmark(databaseIdInt);
496                                                 }
497
498                                                 // Update the display order.
499                                                 for (int i = 0; i < bookmarksListView.getCount(); i++) {
500                                                     // Get the database ID for the current bookmark.
501                                                     int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
502
503                                                     // Move `bookmarksCursor` to the current bookmark position.
504                                                     bookmarksCursor.moveToPosition(i);
505
506                                                     // Update the display order only if it is not correct in the database.
507                                                     if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
508                                                         bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
509                                                     }
510                                                 }
511                                         }
512
513                                         // Reset the deleting bookmarks flag.
514                                         deletingBookmarks = false;
515
516                                         // Enable the delete bookmarks menu item.
517                                         deleteBookmarksMenuItem.setEnabled(true);
518
519                                         // Close the activity if back has been pressed.
520                                         if (closeActivityAfterDismissingSnackbar) {
521                                             onBackPressed();
522                                         }
523                                     }
524                                 });
525
526                         //Show the Snackbar.
527                         bookmarksDeletedSnackbar.show();
528                         break;
529
530                     case R.id.context_menu_select_all_bookmarks:
531                         // Get the total number of bookmarks.
532                         int numberOfBookmarks = bookmarksListView.getCount();
533
534                         // Select them all.
535                         for (int i = 0; i < numberOfBookmarks; i++) {
536                             bookmarksListView.setItemChecked(i, true);
537                         }
538                         break;
539                 }
540
541                 // Consume the click.
542                 return true;
543             }
544
545             @Override
546             public void onDestroyActionMode(ActionMode mode) {
547                 // Do nothing.
548             }
549         });
550
551         // Get handles for the `FloatingActionButtons`.
552         FloatingActionButton createBookmarkFolderFab = findViewById(R.id.create_bookmark_folder_fab);
553         FloatingActionButton createBookmarkFab = findViewById(R.id.create_bookmark_fab);
554
555         // Set the create new bookmark folder FAB to display the `AlertDialog`.
556         createBookmarkFolderFab.setOnClickListener(v -> {
557             // Show the `CreateBookmarkFolderDialog` `AlertDialog` and name the instance `@string/create_folder`.
558             DialogFragment createBookmarkFolderDialog = new CreateBookmarkFolderDialog();
559             createBookmarkFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.create_folder));
560         });
561
562         // Set the create new bookmark FAB to display the `AlertDialog`.
563         createBookmarkFab.setOnClickListener(view -> {
564             // Show the `CreateBookmarkDialog` `AlertDialog` and name the instance `@string/create_bookmark`.
565             DialogFragment createBookmarkDialog = new CreateBookmarkDialog();
566             createBookmarkDialog.show(getSupportFragmentManager(), getResources().getString(R.string.create_bookmark));
567         });
568     }
569
570     @Override
571     public void onRestart() {
572         // Run the default commands.
573         super.onRestart();
574
575         // Update the list view if returning from the bookmarks database view activity.
576         if (restartFromBookmarksDatabaseViewActivity) {
577             // Load the current folder in the list view.
578             loadFolder();
579
580             // Reset `restartFromBookmarksDatabaseViewActivity`.
581             restartFromBookmarksDatabaseViewActivity = false;
582         }
583     }
584
585     @Override
586     public boolean onCreateOptionsMenu(Menu menu) {
587         // Inflate the menu.
588         getMenuInflater().inflate(R.menu.bookmarks_options_menu, menu);
589
590         // Success.
591         return true;
592     }
593
594     @Override
595     public boolean onOptionsItemSelected(MenuItem menuItem) {
596         switch (menuItem.getItemId()) {
597             case android.R.id.home:  // The home arrow is identified as `android.R.id.home`, not just `R.id.home`.
598                 if (currentFolder.isEmpty()) {  // Currently in the home folder.
599                     // Run the back commands.
600                     onBackPressed();
601                 } else {  // Currently in a subfolder.
602                     // Place the former parent folder in `currentFolder`.
603                     currentFolder = bookmarksDatabaseHelper.getParentFolderName(currentFolder);
604
605                     // Load the new folder.
606                     loadFolder();
607                 }
608                 break;
609
610             case R.id.options_menu_select_all_bookmarks:
611                 // Get the total number of bookmarks.
612                 int numberOfBookmarks = bookmarksListView.getCount();
613
614                 // Select them all.
615                 for (int i = 0; i < numberOfBookmarks; i++) {
616                     bookmarksListView.setItemChecked(i, true);
617                 }
618                 break;
619
620             case R.id.bookmarks_database_view:
621                 // Launch `BookmarksDatabaseViewActivity`.
622                 Intent bookmarksDatabaseViewIntent = new Intent(this, BookmarksDatabaseViewActivity.class);
623                 startActivity(bookmarksDatabaseViewIntent);
624                 break;
625         }
626         return true;
627     }
628
629     @Override
630     public void onBackPressed() {
631         // 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.
632         if ((bookmarksDeletedSnackbar != null) && bookmarksDeletedSnackbar.isShown()) {  // Close the bookmarks deleted snackbar before going home.
633             // Set the close flag.
634             closeActivityAfterDismissingSnackbar = true;
635
636             // Dismiss the snackbar.
637             bookmarksDeletedSnackbar.dismiss();
638         } else {  // Go home immediately.
639             // Update the bookmarks folder for the bookmarks drawer in the main WebView activity.
640             MainWebViewActivity.currentBookmarksFolder = currentFolder;
641
642             // Close the bookmarks drawer and reload the bookmarks ListView when returning to the main WebView activity.
643             MainWebViewActivity.restartFromBookmarksActivity = true;
644
645             // Exit the bookmarks activity.
646             super.onBackPressed();
647         }
648     }
649
650     @Override
651     public void onCreateBookmark(DialogFragment dialogFragment) {
652         // Get the views from the dialog fragment.
653         EditText createBookmarkNameEditText = dialogFragment.getDialog().findViewById(R.id.create_bookmark_name_edittext);
654         EditText createBookmarkUrlEditText = dialogFragment.getDialog().findViewById(R.id.create_bookmark_url_edittext);
655
656         // Extract the strings from the edit texts.
657         String bookmarkNameString = createBookmarkNameEditText.getText().toString();
658         String bookmarkUrlString = createBookmarkUrlEditText.getText().toString();
659
660         // Get a copy of the favorite icon bitmap.
661         Bitmap favoriteIcon = MainWebViewActivity.favoriteIconBitmap;
662
663         // Scale the favorite icon bitmap down if it is larger than 256 x 256.  Filtering uses bilinear interpolation.
664         if ((favoriteIcon.getHeight() > 256) || (favoriteIcon.getWidth() > 256)) {
665             favoriteIcon = Bitmap.createScaledBitmap(favoriteIcon, 256, 256, true);
666         }
667
668         // Create a favorite icon byte array output stream.
669         ByteArrayOutputStream favoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
670
671         // Convert the favorite icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
672         favoriteIcon.compress(Bitmap.CompressFormat.PNG, 0, favoriteIconByteArrayOutputStream);
673
674         // Convert the favorite icon byte array stream to a byte array.
675         byte[] favoriteIconByteArray = favoriteIconByteArrayOutputStream.toByteArray();
676
677         // Display the new bookmark below the current items in the (0 indexed) list.
678         int newBookmarkDisplayOrder = bookmarksListView.getCount();
679
680         // Create the bookmark.
681         bookmarksDatabaseHelper.createBookmark(bookmarkNameString, bookmarkUrlString, currentFolder, newBookmarkDisplayOrder, favoriteIconByteArray);
682
683         // Update the bookmarks cursor with the current contents of this folder.
684         // TODO Change this back to a `Cursor` after 2.17.1 is released.
685         bookmarksCursor = (SQLiteCursor) bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolder);
686
687         // Update the `ListView`.
688         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
689
690         // Scroll to the new bookmark.
691         bookmarksListView.setSelection(newBookmarkDisplayOrder);
692     }
693
694     @Override
695     public void onCreateBookmarkFolder(DialogFragment dialogFragment) {
696         // Get handles for the views in the dialog fragment.
697         EditText createFolderNameEditText = dialogFragment.getDialog().findViewById(R.id.create_folder_name_edittext);
698         RadioButton defaultFolderIconRadioButton = dialogFragment.getDialog().findViewById(R.id.create_folder_default_icon_radiobutton);
699         ImageView folderIconImageView = dialogFragment.getDialog().findViewById(R.id.create_folder_default_icon);
700
701         // Get new folder name string.
702         String folderNameString = createFolderNameEditText.getText().toString();
703
704         // Create a folder icon bitmap.
705         Bitmap folderIconBitmap;
706
707         // Set the folder icon bitmap according to the dialog.
708         if (defaultFolderIconRadioButton.isChecked()) {  // Use the default folder icon.
709             // Get the default folder icon drawable.
710             Drawable folderIconDrawable = folderIconImageView.getDrawable();
711
712             // Convert the folder icon drawable to a bitmap drawable.
713             BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
714
715             // Convert the folder icon bitmap drawable to a bitmap.
716             folderIconBitmap = folderIconBitmapDrawable.getBitmap();
717         } else {  // Use the WebView favorite icon.
718             // Get a copy of the favorite icon bitmap.
719             folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
720
721             // Scale the folder icon bitmap down if it is larger than 256 x 256.  Filtering uses bilinear interpolation.
722             if ((folderIconBitmap.getHeight() > 256) || (folderIconBitmap.getWidth() > 256)) {
723                 folderIconBitmap = Bitmap.createScaledBitmap(folderIconBitmap, 256, 256, true);
724             }
725         }
726
727         // Create a folder icon byte array output stream.
728         ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
729
730         // Convert the folder icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
731         folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
732
733         // Convert the folder icon byte array stream to a byte array.
734         byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
735
736         // Move all the bookmarks down one in the display order.
737         for (int i = 0; i < bookmarksListView.getCount(); i++) {
738             int databaseId = (int) bookmarksListView.getItemIdAtPosition(i);
739             bookmarksDatabaseHelper.updateDisplayOrder(databaseId, i + 1);
740         }
741
742         // Create the folder, which will be placed at the top of the `ListView`.
743         bookmarksDatabaseHelper.createFolder(folderNameString, currentFolder, folderIconByteArray);
744
745         // Update the bookmarks cursor with the current contents of this folder.
746         // TODO Change this back to a `Cursor` after 2.17.1 is released.
747         bookmarksCursor = (SQLiteCursor) bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolder);
748
749         // Update the `ListView`.
750         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
751
752         // Scroll to the new folder.
753         bookmarksListView.setSelection(0);
754     }
755
756     @Override
757     public void onSaveBookmark(DialogFragment dialogFragment, int selectedBookmarkDatabaseId) {
758         // Get handles for the views from `dialogFragment`.
759         EditText editBookmarkNameEditText = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_name_edittext);
760         EditText editBookmarkUrlEditText = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_url_edittext);
761         RadioButton currentBookmarkIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_current_icon_radiobutton);
762
763         // Store the bookmark strings.
764         String bookmarkNameString = editBookmarkNameEditText.getText().toString();
765         String bookmarkUrlString = editBookmarkUrlEditText.getText().toString();
766
767         // Update the bookmark.
768         if (currentBookmarkIconRadioButton.isChecked()) {  // Update the bookmark without changing the favorite icon.
769             bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString);
770         } else {  // Update the bookmark using the `WebView` favorite icon.
771             // Get a copy of the favorite icon bitmap.
772             Bitmap favoriteIconBitmap = MainWebViewActivity.favoriteIconBitmap;
773
774             // Scale the favorite icon bitmap down if it is larger than 256 x 256.  Filtering uses bilinear interpolation.
775             if ((favoriteIconBitmap.getHeight() > 256) || (favoriteIconBitmap.getWidth() > 256)) {
776                 favoriteIconBitmap = Bitmap.createScaledBitmap(favoriteIconBitmap, 256, 256, true);
777             }
778
779             // Create a favorite icon byte array output stream.
780             ByteArrayOutputStream newFavoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
781
782             // Convert the favorite icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
783             favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFavoriteIconByteArrayOutputStream);
784
785             // Convert the favorite icon byte array stream to a byte array.
786             byte[] newFavoriteIconByteArray = newFavoriteIconByteArrayOutputStream.toByteArray();
787
788             //  Update the bookmark and the favorite icon.
789             bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString, newFavoriteIconByteArray);
790         }
791
792         // Close the contextual action mode.
793         contextualActionMode.finish();
794
795         // Update the bookmarks cursor with the contents of the current folder.
796         // TODO Change this back to a `Cursor` after 2.17.1 is released.
797         bookmarksCursor = (SQLiteCursor) bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolder);
798
799         // Update the `ListView`.
800         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
801     }
802
803     @Override
804     public void onSaveBookmarkFolder(DialogFragment dialogFragment, int selectedFolderDatabaseId) {
805         // Get handles for the views from `dialogFragment`.
806         RadioButton currentFolderIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_folder_current_icon_radiobutton);
807         RadioButton defaultFolderIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon_radiobutton);
808         ImageView defaultFolderIconImageView = dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon_imageview);
809         EditText editFolderNameEditText = dialogFragment.getDialog().findViewById(R.id.edit_folder_name_edittext);
810
811         // Get the new folder name.
812         String newFolderNameString = editFolderNameEditText.getText().toString();
813
814         // Check if the favorite icon has changed.
815         if (currentFolderIconRadioButton.isChecked()) {  // Only the name has changed.
816             // Update the name in the database.
817             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, oldFolderNameString, newFolderNameString);
818         } else if (!currentFolderIconRadioButton.isChecked() && newFolderNameString.equals(oldFolderNameString)) {  // Only the icon has changed.
819             // Create the new folder icon Bitmap.
820             Bitmap folderIconBitmap;
821
822             // Populate the new folder icon bitmap.
823             if (defaultFolderIconRadioButton.isChecked()) {
824                 // Get the default folder icon drawable.
825                 Drawable folderIconDrawable = defaultFolderIconImageView.getDrawable();
826
827                 // Convert the folder icon drawable to a bitmap drawable.
828                 BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
829
830                 // Convert the folder icon bitmap drawable to a bitmap.
831                 folderIconBitmap = folderIconBitmapDrawable.getBitmap();
832             } else {  // Use the WebView favorite icon.
833                 // Get a copy of the favorite icon bitmap.
834                 folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
835
836                 // Scale the folder icon bitmap down if it is larger than 256 x 256.  Filtering uses bilinear interpolation.
837                 if ((folderIconBitmap.getHeight() > 256) || (folderIconBitmap.getWidth() > 256)) {
838                     folderIconBitmap = Bitmap.createScaledBitmap(folderIconBitmap, 256, 256, true);
839                 }
840             }
841
842             // Create a folder icon byte array output stream.
843             ByteArrayOutputStream newFolderIconByteArrayOutputStream = new ByteArrayOutputStream();
844
845             // Convert the folder icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
846             folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFolderIconByteArrayOutputStream);
847
848             // Convert the folder icon byte array stream to a byte array.
849             byte[] newFolderIconByteArray = newFolderIconByteArrayOutputStream.toByteArray();
850
851             // Update the folder icon in the database.
852             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, newFolderIconByteArray);
853         } else {  // The folder icon and the name have changed.
854             // Instantiate the new folder icon `Bitmap`.
855             Bitmap folderIconBitmap;
856
857             // Populate the new folder icon bitmap.
858             if (defaultFolderIconRadioButton.isChecked()) {
859                 // Get the default folder icon drawable.
860                 Drawable folderIconDrawable = defaultFolderIconImageView.getDrawable();
861
862                 // Convert the folder icon drawable to a bitmap drawable.
863                 BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
864
865                 // Convert the folder icon bitmap drawable to a bitmap.
866                 folderIconBitmap = folderIconBitmapDrawable.getBitmap();
867             } else {  // Use the WebView favorite icon.
868                 // Get a copy of the favorite icon bitmap.
869                 folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
870
871                 // Scale the folder icon bitmap down if it is larger than 256 x 256.  Filtering uses bilinear interpolation.
872                 if ((folderIconBitmap.getHeight() > 256) || (folderIconBitmap.getWidth() > 256)) {
873                     folderIconBitmap = Bitmap.createScaledBitmap(folderIconBitmap, 256, 256, true);
874                 }
875             }
876
877             // Create a folder icon byte array output stream.
878             ByteArrayOutputStream newFolderIconByteArrayOutputStream = new ByteArrayOutputStream();
879
880             // Convert the folder icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
881             folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFolderIconByteArrayOutputStream);
882
883             // Convert the folder icon byte array stream to a byte array.
884             byte[] newFolderIconByteArray = newFolderIconByteArrayOutputStream.toByteArray();
885
886             // Update the folder name and icon in the database.
887             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, oldFolderNameString, newFolderNameString, newFolderIconByteArray);
888         }
889
890         // Update the bookmarks cursor with the current contents of this folder.
891         // TODO Change this back to a `Cursor` after 2.17.1 is released.
892         bookmarksCursor = (SQLiteCursor) bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolder);
893
894         // Update the `ListView`.
895         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
896
897         // Close the contextual action mode.
898         contextualActionMode.finish();
899     }
900
901     @Override
902     public void onMoveToFolder(DialogFragment dialogFragment) {
903         // Get a handle for the `ListView` from `dialogFragment`.
904         ListView folderListView = dialogFragment.getDialog().findViewById(R.id.move_to_folder_listview);
905
906         // Store a long array of the selected folders.
907         long[] newFolderLongArray = folderListView.getCheckedItemIds();
908
909         // Get the new folder database ID.  Only one folder will be selected.
910         int newFolderDatabaseId = (int) newFolderLongArray[0];
911
912         // Instantiate `newFolderName`.
913         String newFolderName;
914
915         // Set the new folder name.
916         if (newFolderDatabaseId == 0) {
917             // The new folder is the home folder, represented as `""` in the database.
918             newFolderName = "";
919         } else {
920             // Get the new folder name from the database.
921             newFolderName = bookmarksDatabaseHelper.getFolderName(newFolderDatabaseId);
922         }
923
924         // Get a long array with the the database ID of the selected bookmarks.
925         long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
926
927         // Move each of the selected bookmarks to the new folder.
928         for (long databaseIdLong : selectedBookmarksLongArray) {
929             // Get `databaseIdInt` for each selected bookmark.
930             int databaseIdInt = (int) databaseIdLong;
931
932             // Move the selected bookmark to the new folder.
933             bookmarksDatabaseHelper.moveToFolder(databaseIdInt, newFolderName);
934         }
935
936         // Update the bookmarks cursor with the current contents of this folder.
937         // TODO Change this back to a `Cursor` after 2.17.1 is released.
938         bookmarksCursor = (SQLiteCursor) bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolder);
939
940         // Update the `ListView`.
941         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
942
943         // Close the contextual app bar.
944         contextualActionMode.finish();
945     }
946
947     private void deleteBookmarkFolderContents(int databaseId) {
948         // Get the name of the folder.
949         String folderName = bookmarksDatabaseHelper.getFolderName(databaseId);
950
951         // Get the contents of the folder.
952         Cursor folderCursor = bookmarksDatabaseHelper.getBookmarkIDs(folderName);
953
954         // Delete each of the bookmarks in the folder.
955         for (int i = 0; i < folderCursor.getCount(); i++) {
956             // Move `folderCursor` to the current row.
957             folderCursor.moveToPosition(i);
958
959             // Get the database ID of the item.
960             int itemDatabaseId = folderCursor.getInt(folderCursor.getColumnIndex(BookmarksDatabaseHelper._ID));
961
962             // If this is a folder, recursively delete the contents first.
963             if (bookmarksDatabaseHelper.isFolder(itemDatabaseId)) {
964                 deleteBookmarkFolderContents(itemDatabaseId);
965             }
966
967             // Delete the bookmark.
968             bookmarksDatabaseHelper.deleteBookmark(itemDatabaseId);
969         }
970     }
971
972     private void updateMoveIcons() {
973         // Get a long array of the selected bookmarks.
974         long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
975
976         // Get the database IDs for the first, last, and selected bookmarks.
977         int selectedBookmarkDatabaseId = (int) selectedBookmarksLongArray[0];
978         int firstBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(0);
979         // bookmarksListView is 0 indexed.
980         int lastBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(bookmarksListView.getCount() - 1);
981
982         // Update the move bookmark up `MenuItem`.
983         if (selectedBookmarkDatabaseId == firstBookmarkDatabaseId) {  // The selected bookmark is in the first position.
984             // Disable the move bookmark up `MenuItem`.
985             moveBookmarkUpMenuItem.setEnabled(false);
986
987             //  Set the move bookmark up icon to be ghosted.
988             moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_disabled);
989         } else {  // The selected bookmark is not in the first position.
990             // Enable the move bookmark up `MenuItem`.
991             moveBookmarkUpMenuItem.setEnabled(true);
992
993             // Set the icon according to the theme.
994             if (MainWebViewActivity.darkTheme) {
995                 moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_enabled_dark);
996             } else {
997                 moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_enabled_light);
998             }
999         }
1000
1001         // Update the move bookmark down `MenuItem`.
1002         if (selectedBookmarkDatabaseId == lastBookmarkDatabaseId) {  // The selected bookmark is in the last position.
1003             // Disable the move bookmark down `MenuItem`.
1004             moveBookmarkDownMenuItem.setEnabled(false);
1005
1006             // Set the move bookmark down icon to be ghosted.
1007             moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_disabled);
1008         } else {  // The selected bookmark is not in the last position.
1009             // Enable the move bookmark down `MenuItem`.
1010             moveBookmarkDownMenuItem.setEnabled(true);
1011
1012             // Set the icon according to the theme.
1013             if (MainWebViewActivity.darkTheme) {
1014                 moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_enabled_dark);
1015             } else {
1016                 moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_enabled_light);
1017             }
1018         }
1019     }
1020
1021     private void scrollBookmarks(int selectedBookmarkPosition) {
1022         // Get the first and last visible bookmark positions.
1023         int firstVisibleBookmarkPosition = bookmarksListView.getFirstVisiblePosition();
1024         int lastVisibleBookmarkPosition = bookmarksListView.getLastVisiblePosition();
1025
1026         // Calculate the number of bookmarks per screen.
1027         int numberOfBookmarksPerScreen = lastVisibleBookmarkPosition - firstVisibleBookmarkPosition;
1028
1029         // Scroll with the moved bookmark if necessary.
1030         if (selectedBookmarkPosition <= firstVisibleBookmarkPosition) {  // The selected bookmark position is at or above the top of the screen.
1031             // Scroll to the selected bookmark position.
1032             bookmarksListView.setSelection(selectedBookmarkPosition);
1033         } else if (selectedBookmarkPosition >= (lastVisibleBookmarkPosition - 1)) {  // The selected bookmark is at or below the bottom of the screen.
1034             // 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.
1035             // `+1` assures that the entire bookmark will be displayed in situations where only a partial bookmark fits at the bottom of the list view.
1036             bookmarksListView.setSelection(selectedBookmarkPosition - numberOfBookmarksPerScreen + 1);
1037         }
1038     }
1039
1040     private void loadFolder() {
1041         // Update bookmarks cursor with the contents of the bookmarks database for the current folder.
1042         // TODO Change this back to a `Cursor` after 2.17.1 is released.
1043         bookmarksCursor = (SQLiteCursor) bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolder);
1044
1045         // TODO Remove after the release of 2.17.1.
1046         if (Build.VERSION.SDK_INT >= 28) {
1047             // Create a big cursor window.
1048             CursorWindow bigCursorWindow = new CursorWindow("Big Cursor Window", 4194304);
1049
1050             bookmarksCursor.setWindow(bigCursorWindow);
1051         }
1052
1053         // Setup a `CursorAdapter`.  `this` specifies the `Context`.  `false` disables `autoRequery`.
1054         bookmarksCursorAdapter = new CursorAdapter(this, bookmarksCursor, false) {
1055             @Override
1056             public View newView(Context context, Cursor cursor, ViewGroup parent) {
1057                 // Inflate the individual item layout.  `false` does not attach it to the root.
1058                 return getLayoutInflater().inflate(R.layout.bookmarks_activity_item_linearlayout, parent, false);
1059             }
1060
1061             @Override
1062             public void bindView(View view, Context context, Cursor cursor) {
1063                 // Get handles for the views.
1064                 ImageView bookmarkFavoriteIcon = view.findViewById(R.id.bookmark_favorite_icon);
1065                 TextView bookmarkNameTextView = view.findViewById(R.id.bookmark_name);
1066
1067                 // Get the favorite icon byte array from the `Cursor`.
1068                 byte[] favoriteIconByteArray = cursor.getBlob(cursor.getColumnIndex(BookmarksDatabaseHelper.FAVORITE_ICON));
1069
1070                 // Convert the byte array to a `Bitmap` beginning at the first byte and ending at the last.
1071                 Bitmap favoriteIconBitmap = BitmapFactory.decodeByteArray(favoriteIconByteArray, 0, favoriteIconByteArray.length);
1072
1073                 // Display the bitmap in `bookmarkFavoriteIcon`.
1074                 bookmarkFavoriteIcon.setImageBitmap(favoriteIconBitmap);
1075
1076                 // Get the bookmark name from the cursor and display it in `bookmarkNameTextView`.
1077                 String bookmarkNameString = cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
1078                 bookmarkNameTextView.setText(bookmarkNameString);
1079
1080                 // Make the font bold for folders.
1081                 if (cursor.getInt(cursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1) {
1082                     bookmarkNameTextView.setTypeface(Typeface.DEFAULT_BOLD);
1083                 } else {  // Reset the font to default for normal bookmarks.
1084                     bookmarkNameTextView.setTypeface(Typeface.DEFAULT);
1085                 }
1086             }
1087         };
1088
1089         // Populate the list view with the adapter.
1090         bookmarksListView.setAdapter(bookmarksCursorAdapter);
1091
1092         // Set the `AppBar` title.
1093         if (currentFolder.isEmpty()) {
1094             appBar.setTitle(R.string.bookmarks);
1095         } else {
1096             appBar.setTitle(currentFolder);
1097         }
1098     }
1099
1100     @Override
1101     public void onDestroy() {
1102         // Close the bookmarks cursor and database.
1103         bookmarksCursor.close();
1104         bookmarksDatabaseHelper.close();
1105
1106         // Run the default commands.
1107         super.onDestroy();
1108     }
1109 }