Add an option to sort by display order in the bookmarks database view. https://redmi...
[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.app.Activity;
23 import android.content.Context;
24 import android.content.Intent;
25 import android.database.Cursor;
26 import android.graphics.Bitmap;
27 import android.graphics.BitmapFactory;
28 import android.graphics.Typeface;
29 import android.graphics.drawable.BitmapDrawable;
30 import android.graphics.drawable.Drawable;
31 import android.os.Bundle;
32 import android.support.design.widget.FloatingActionButton;
33 import android.support.design.widget.Snackbar;
34 import android.support.v4.app.NavUtils;
35 import android.support.v7.app.ActionBar;
36 import android.support.v7.app.AppCompatActivity;
37 // `AppCompatDialogFragment` is required instead of `DialogFragment` or an error is produced on API <=22.
38 import android.support.v7.app.AppCompatDialogFragment;
39 import android.support.v7.widget.Toolbar;
40 import android.util.SparseBooleanArray;
41 import android.view.ActionMode;
42 import android.view.Menu;
43 import android.view.MenuItem;
44 import android.view.View;
45 import android.view.ViewGroup;
46 import android.view.WindowManager;
47 import android.widget.AbsListView;
48 import android.widget.CursorAdapter;
49 import android.widget.EditText;
50 import android.widget.ImageView;
51 import android.widget.ListView;
52 import android.widget.RadioButton;
53 import android.widget.TextView;
54
55 import com.stoutner.privacybrowser.dialogs.CreateBookmarkDialog;
56 import com.stoutner.privacybrowser.dialogs.CreateBookmarkFolderDialog;
57 import com.stoutner.privacybrowser.dialogs.EditBookmarkDialog;
58 import com.stoutner.privacybrowser.dialogs.EditBookmarkFolderDialog;
59 import com.stoutner.privacybrowser.dialogs.MoveToFolderDialog;
60 import com.stoutner.privacybrowser.R;
61 import com.stoutner.privacybrowser.helpers.BookmarksDatabaseHelper;
62
63 import java.io.ByteArrayOutputStream;
64
65 public class BookmarksActivity extends AppCompatActivity implements CreateBookmarkDialog.CreateBookmarkListener, CreateBookmarkFolderDialog.CreateBookmarkFolderListener, EditBookmarkDialog.EditBookmarkListener,
66         EditBookmarkFolderDialog.EditBookmarkFolderListener, MoveToFolderDialog.MoveToFolderListener {
67
68     // `currentFolder` is public static so it can be accessed from `MoveToFolderDialog`.
69     // It is used in `onCreate`, `onOptionsItemSelected()`, `onBackPressed()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`,
70     // and `loadFolder()`.
71     public static String currentFolder;
72
73     // `checkedItemIds` is public static so it can be accessed from `MoveToFolderDialog`.  It is also used in `onCreate()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`,
74     // and `updateMoveIcons()`.
75     public static long[] checkedItemIds;
76
77
78     // `bookmarksDatabaseHelper` is used in `onCreate()`, `onOptionsItemSelected()`, `onBackPressed()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`,
79     // `onMoveToFolder()`, `deleteBookmarkFolderContents()`, `loadFolder()`, and `onDestroy()`.
80     private BookmarksDatabaseHelper bookmarksDatabaseHelper;
81
82     // `bookmarksListView` is used in `onCreate()`, `onOptionsItemSelected()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`,
83     // `updateMoveIcons()`, `scrollBookmarks()`, and `loadFolder()`.
84     private ListView bookmarksListView;
85
86     // `bookmarksCursor` is used in `onCreate()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`, `deleteBookmarkFolderContents()`,
87     // `loadFolder()`, and `onDestroy()`.
88     private Cursor bookmarksCursor;
89
90     // `bookmarksCursorAdapter` is used in `onCreate(), `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, `onMoveToFolder()`, and `onLoadFolder()`.
91     private CursorAdapter bookmarksCursorAdapter;
92
93     // `contextualActionMode` is used in `onCreate()`, `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()` and `onMoveToFolder()`.
94     private ActionMode contextualActionMode;
95
96     // `appBar` is used in `onCreate()` and `loadFolder()`.
97     private ActionBar appBar;
98
99     // `oldFolderName` is used in `onCreate()` and `onSaveBookmarkFolder()`.
100     private String oldFolderNameString;
101
102     // `moveBookmarkUpMenuItem` is used in `onCreate()` and `updateMoveIcons()`.
103     private MenuItem moveBookmarkUpMenuItem;
104
105     // `moveBookmarkDownMenuItem` is used in `onCreate()` and `updateMoveIcons()`.
106     private MenuItem moveBookmarkDownMenuItem;
107
108     // `bookmarksDeletedSnackbar` is used in `onCreate()`, `onOptionsItemSelected()`, and `onBackPressed()`.
109     private Snackbar bookmarksDeletedSnackbar;
110
111     // `closeActivityAfterDismissingSnackbar` is used in `onCreate()`, `onOptionsItemSelected()`, and `onBackPressed()`.
112     private boolean closeActivityAfterDismissingSnackbar;
113
114     @Override
115     protected void onCreate(Bundle savedInstanceState) {
116         // Disable screenshots if not allowed.
117         if (!MainWebViewActivity.allowScreenshots) {
118             getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
119         }
120
121         // Set the activity theme.
122         if (MainWebViewActivity.darkTheme) {
123             setTheme(R.style.PrivacyBrowserDark_SecondaryActivity);
124         } else {
125             setTheme(R.style.PrivacyBrowserLight_SecondaryActivity);
126         }
127
128         // Run the default commands.
129         super.onCreate(savedInstanceState);
130
131         // Get the intent that launched the activity.
132         Intent launchingIntent = getIntent();
133
134         // Set the current folder variable.
135         if (launchingIntent.getStringExtra("Current Folder") != null) {  // Set the current folder from the intent.
136             currentFolder = launchingIntent.getStringExtra("Current Folder");
137         } else {  // Set the current folder to be `""`, which is the home folder.
138             currentFolder = "";
139         }
140
141         // Set the content view.
142         setContentView(R.layout.bookmarks_coordinatorlayout);
143
144         // Use the `SupportActionBar` from `android.support.v7.app.ActionBar` until the minimum API is >= 21.
145         final Toolbar bookmarksAppBar = findViewById(R.id.bookmarks_toolbar);
146         setSupportActionBar(bookmarksAppBar);
147
148         // Get a handle for the activity, the app bar, and the ListView.
149         final Activity bookmarksActivity = this;
150         appBar = getSupportActionBar();
151         bookmarksListView = findViewById(R.id.bookmarks_listview);
152
153         // Remove the incorrect lint warning that `appBar` might be null.
154         assert appBar != null;
155
156         // Display the home arrow on the app bar.
157         appBar.setDisplayHomeAsUpEnabled(true);
158
159         // Initialize the database helper.  `this` specifies the context.  The two `nulls` do not specify the database name or a `CursorFactory`.
160         // The `0` specifies a database version, but that is ignored and set instead using a constant in `BookmarksDatabaseHelper`.
161         bookmarksDatabaseHelper = new BookmarksDatabaseHelper(this, null, null, 0);
162
163         // Load the home folder.
164         loadFolder();
165
166         // Set a listener so that tapping a list item loads the URL or folder.
167         bookmarksListView.setOnItemClickListener((parent, view, position, id) -> {
168             // Convert the id from long to int to match the format of the bookmarks database.
169             int databaseID = (int) id;
170
171             // Get the bookmark cursor for this ID and move it to the first row.
172             Cursor bookmarkCursor = bookmarksDatabaseHelper.getBookmarkCursor(databaseID);
173             bookmarkCursor.moveToFirst();
174
175             // Act upon the bookmark according to the type.
176             if (bookmarkCursor.getInt(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1) {  // The selected bookmark is a folder.
177                 // Update the current folder.
178                 currentFolder = bookmarkCursor.getString(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
179
180                 // Load the new folder.
181                 loadFolder();
182             } else {  // The selected bookmark is not a folder.
183                 // Get the bookmark URL and assign it to `formattedUrlString`.
184                 MainWebViewActivity.formattedUrlString = bookmarkCursor.getString(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_URL));
185
186                 // Set `MainWebViewActivity` to load the new URL on restart.
187                 MainWebViewActivity.loadUrlOnRestart = true;
188
189                 // Update the bookmarks folder for the bookmarks drawer in `MainWebViewActivity`.
190                 MainWebViewActivity.currentBookmarksFolder = currentFolder;
191
192                 // Close the bookmarks drawer and reload the bookmarks `ListView` when returning to `MainWebViewActivity`.
193                 MainWebViewActivity.restartFromBookmarksActivity = true;
194
195                 // Return to `MainWebViewActivity`.
196                 NavUtils.navigateUpFromSameTask(bookmarksActivity);
197             }
198
199             // Close the `Cursor`.
200             bookmarkCursor.close();
201         });
202
203         // Get a handle for the activity.
204         Activity activity = this;
205
206         // `MultiChoiceModeListener` handles long clicks.
207         bookmarksListView.setMultiChoiceModeListener(new AbsListView.MultiChoiceModeListener() {
208             // Instantiate the common variables.
209             MenuItem editBookmarkMenuItem;
210             MenuItem deleteBookmarksMenuItem;
211             MenuItem selectAllBookmarksMenuItem;
212             boolean deletingBookmarks;
213
214             @Override
215             public boolean onCreateActionMode(ActionMode mode, Menu menu) {
216                 // Inflate the menu for the contextual app bar and set the title.
217                 getMenuInflater().inflate(R.menu.bookmarks_context_menu, menu);
218
219                 // Set the title.
220                 if (currentFolder.isEmpty()) {
221                     // Use `R.string.bookmarks` if we are in the home folder.
222                     mode.setTitle(R.string.bookmarks);
223                 } else {  // Use the current folder name as the title.
224                     mode.setTitle(currentFolder);
225                 }
226
227                 // Get a handle for `MenuItems` that need to be selectively disabled.
228                 moveBookmarkUpMenuItem = menu.findItem(R.id.move_bookmark_up);
229                 moveBookmarkDownMenuItem = menu.findItem(R.id.move_bookmark_down);
230                 editBookmarkMenuItem = menu.findItem(R.id.edit_bookmark);
231                 deleteBookmarksMenuItem = menu.findItem(R.id.delete_bookmark);
232                 selectAllBookmarksMenuItem = menu.findItem(R.id.context_menu_select_all_bookmarks);
233
234                 // Disable the delete bookmarks menu item if a delete is pending.
235                 if (deletingBookmarks) {
236                     deleteBookmarksMenuItem.setEnabled(false);
237                 }
238
239                 // Store `contextualActionMode` so it can be closed programatically.
240                 contextualActionMode = mode;
241
242                 // Make it so.
243                 return true;
244             }
245
246             @Override
247             public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
248                 // Get a handle for the move to folder menu item.
249                 MenuItem moveToFolderMenuItem = menu.findItem(R.id.move_to_folder);
250
251                 // Get a `Cursor` with all of the folders.
252                 Cursor folderCursor = bookmarksDatabaseHelper.getAllFoldersCursor();
253
254                 // Enable the move to folder menu item if at least one folder exists.
255                 moveToFolderMenuItem.setVisible(folderCursor.getCount() > 0);
256
257                 // Make it so.
258                 return true;
259             }
260
261             @Override
262             public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
263                 // Get a long array of the selected bookmarks.
264                 long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
265
266                 // Calculate the number of selected bookmarks.
267                 int numberOfSelectedBookmarks = selectedBookmarksLongArray.length;
268
269                 // Adjust the `ActionMode` and the `Menu` according to the number of selected bookmarks.
270                 if (numberOfSelectedBookmarks == 0) {  // No bookmarks are selected.
271                     // Close the `ActionMode`.
272                     mode.finish();
273                 } else if (numberOfSelectedBookmarks == 1) {  // One bookmark is selected.
274                     // List the number of selected bookmarks in the subtitle.
275                     mode.setSubtitle(getString(R.string.one_selected));
276
277                     // Show the `Move Up`, `Move Down`, and  `Edit` options.
278                     moveBookmarkUpMenuItem.setVisible(true);
279                     moveBookmarkDownMenuItem.setVisible(true);
280                     editBookmarkMenuItem.setVisible(true);
281
282                     // Update the enabled status of the move icons.
283                     updateMoveIcons();
284                 } else {  // More than one bookmark is selected.
285                     // List the number of selected bookmarks according to the language.
286                     if (getString(R.string.android_asset_path).equals("ru")) {  // The Russian translation is used.
287                         // Convert the number of selected bookmarks to a string.
288                         String numberOfSelectedBookmarksString = String.valueOf(numberOfSelectedBookmarks);
289
290                         // Russian follows rule #7 at <https://developer.mozilla.org/en-US/docs/Mozilla/Localization/Localization_and_Plurals>.
291                         if (numberOfSelectedBookmarksString.endsWith("1") && !numberOfSelectedBookmarksString.equals("11")) {  //  Ends in 1.
292                             mode.setSubtitle(numberOfSelectedBookmarks + " " + getString(R.string.selected_russian_ends_in_1));
293                         } else if ((numberOfSelectedBookmarksString.endsWith("2") || numberOfSelectedBookmarksString.endsWith("3") || numberOfSelectedBookmarksString.endsWith("4")) &&
294                                 !numberOfSelectedBookmarksString.equals("12") && !numberOfSelectedBookmarksString.equals("13") && !numberOfSelectedBookmarksString.equals("14")) {  // Ends in 2-4.
295                             mode.setSubtitle(numberOfSelectedBookmarks + " " + getString(R.string.selected_russian_ends_in_2));
296                         } else {  // Everything else.
297                             mode.setSubtitle(numberOfSelectedBookmarks + " " + getString(R.string.selected_russian_everything_else));
298                         }
299                     } else {  // Another language is used.
300                         // List the number of selected bookmarks in the subtitle.
301                         mode.setSubtitle(numberOfSelectedBookmarks + " " + getString(R.string.selected));
302                     }
303
304                     // Hide non-applicable `MenuItems`.
305                     moveBookmarkUpMenuItem.setVisible(false);
306                     moveBookmarkDownMenuItem.setVisible(false);
307                     editBookmarkMenuItem.setVisible(false);
308                 }
309
310                 // Do not show `Select All` if all the bookmarks are already checked.
311                 if (bookmarksListView.getCheckedItemIds().length == bookmarksListView.getCount()) {
312                     selectAllBookmarksMenuItem.setVisible(false);
313                 } else {
314                     selectAllBookmarksMenuItem.setVisible(true);
315                 }
316             }
317
318             @Override
319             public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
320                 // Get the menu item ID.
321                 int menuItemId = item.getItemId();
322
323                 // Instantiate the common variables.
324                 int selectedBookmarkPosition;
325                 int selectedBookmarkNewPosition;
326                 final SparseBooleanArray selectedBookmarksPositionsSparseBooleanArray;
327
328                 switch (menuItemId) {
329                     case R.id.move_bookmark_up:
330                         // Get the array of checked bookmark positions.
331                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
332
333                         // Store the position of the selected bookmark.  Only one bookmark is selected when `move_bookmark_up` is enabled.
334                         selectedBookmarkPosition = selectedBookmarksPositionsSparseBooleanArray.keyAt(0);
335
336                         // Calculate the new position of the selected bookmark.
337                         selectedBookmarkNewPosition = selectedBookmarkPosition - 1;
338
339                         // Iterate through the bookmarks.
340                         for (int i = 0; i < bookmarksListView.getCount(); i++) {
341                             // Get the database ID for the current bookmark.
342                             int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
343
344                             // Update the display order for the current bookmark.
345                             if (i == selectedBookmarkPosition) {  // The current bookmark is the selected bookmark.
346                                 // Move the current bookmark up one.
347                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i - 1);
348                             } else if ((i + 1) == selectedBookmarkPosition){  // The current bookmark is immediately above the selected bookmark.
349                                 // Move the current bookmark down one.
350                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i + 1);
351                             } else {  // The current bookmark is not changing positions.
352                                 // Move `bookmarksCursor` to the current bookmark position.
353                                 bookmarksCursor.moveToPosition(i);
354
355                                 // Update the display order only if it is not correct in the database.
356                                 if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
357                                     bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
358                                 }
359                             }
360                         }
361
362                         // Update `bookmarksCursor` with the current contents of the bookmarks database.
363                         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
364
365                         // Update the `ListView`.
366                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
367
368                         // Scroll with the bookmark.
369                         scrollBookmarks(selectedBookmarkNewPosition);
370
371                         // Update the enabled status of the move icons.
372                         updateMoveIcons();
373                         break;
374
375                     case R.id.move_bookmark_down:
376                         // Get the array of checked bookmark positions.
377                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
378
379                         // Store the position of the selected bookmark.  Only one bookmark is selected when `move_bookmark_down` is enabled.
380                         selectedBookmarkPosition = selectedBookmarksPositionsSparseBooleanArray.keyAt(0);
381
382                         // Calculate the new position of the selected bookmark.
383                         selectedBookmarkNewPosition = selectedBookmarkPosition + 1;
384
385                         // Iterate through the bookmarks.
386                         for (int i = 0; i <bookmarksListView.getCount(); i++) {
387                             // Get the database ID for the current bookmark.
388                             int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
389
390                             // Update the display order for the current bookmark.
391                             if (i == selectedBookmarkPosition) {  // The current bookmark is the selected bookmark.
392                                 // Move the current bookmark down one.
393                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i + 1);
394                             } else if ((i - 1) == selectedBookmarkPosition) {  // The current bookmark is immediately below the selected bookmark.
395                                 // Move the bookmark below the selected bookmark up one.
396                                 bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i - 1);
397                             } else {  // The current bookmark is not changing positions.
398                                 // Move `bookmarksCursor` to the current bookmark position.
399                                 bookmarksCursor.moveToPosition(i);
400
401                                 // Update the display order only if it is not correct in the database.
402                                 if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
403                                     bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
404                                 }
405                             }
406                         }
407
408                         // Update `bookmarksCursor` with the current contents of the bookmarks database.
409                         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
410
411                         // Update the `ListView`.
412                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
413
414                         // Scroll with the bookmark.
415                         scrollBookmarks(selectedBookmarkNewPosition);
416
417                         // Update the enabled status of the move icons.
418                         updateMoveIcons();
419                         break;
420
421                     case R.id.move_to_folder:
422                         // Store `checkedItemIds` for use by the `AlertDialog`.
423                         checkedItemIds = bookmarksListView.getCheckedItemIds();
424
425                         // Show the `MoveToFolderDialog` `AlertDialog` and name the instance `@string/move_to_folder
426                         AppCompatDialogFragment moveToFolderDialog = new MoveToFolderDialog();
427                         moveToFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.move_to_folder));
428                         break;
429
430                     case R.id.edit_bookmark:
431                         // Get the array of checked bookmark positions.
432                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions();
433
434                         // Get the position of the selected bookmark.  Only one bookmark is selected when `edit_bookmark_down` is enabled.
435                         selectedBookmarkPosition = selectedBookmarksPositionsSparseBooleanArray.keyAt(0);
436
437                         // Move the `Cursor` to the selected position and find out if it is a folder.
438                         bookmarksCursor.moveToPosition(selectedBookmarkPosition);
439                         boolean isFolder = (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1);
440
441                         // Get the selected bookmark database ID.
442                         int databaseId = bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper._ID));
443
444                         // Show the edit bookmark or edit bookmark folder dialog.
445                         if (isFolder) {
446                             // Save the current folder name, which is used in `onSaveBookmarkFolder()`.
447                             oldFolderNameString = bookmarksCursor.getString(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
448
449                             // Show the edit bookmark folder dialog.
450                             AppCompatDialogFragment editFolderDialog = EditBookmarkFolderDialog.folderDatabaseId(databaseId);
451                             editFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_folder));
452                         } else {
453                             // Show the edit bookmark dialog.
454                             AppCompatDialogFragment editBookmarkDialog = EditBookmarkDialog.bookmarkDatabaseId(databaseId);
455                             editBookmarkDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_bookmark));
456                         }
457                         break;
458
459                     case R.id.delete_bookmark:
460                         // Set the deleting bookmarks flag, which prevents the delete menu item from being enabled until the current process finishes.
461                         deletingBookmarks = true;
462
463                         // Get an array of the selected row IDs.
464                         final long[] selectedBookmarksIdsLongArray = bookmarksListView.getCheckedItemIds();
465
466                         // Get the array of checked bookmarks.  `.clone()` makes a copy that won't change if `bookmarksListView` is reloaded, which is needed for re-selecting the bookmarks on undelete.
467                         selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions().clone();
468
469                         // Update `bookmarksCursor` with the current contents of the bookmarks database except for the specified database IDs.
470                         bookmarksCursor = bookmarksDatabaseHelper.getBookmarksCursorExcept(selectedBookmarksIdsLongArray, currentFolder);
471
472                         // Update the `ListView`.
473                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
474
475                         // Instantiate `snackbarMessage`.
476                         String snackbarMessage;
477
478                         // Determine how many items are in the array and prepare an appropriate snackbar message.
479                         if (selectedBookmarksIdsLongArray.length == 1) {
480                             snackbarMessage = getString(R.string.one_bookmark_deleted);
481                         } else {
482                             // Prepare a snackbar according to the language.
483                             if (getString(R.string.android_asset_path).equals("ru")) {  // The Russian translation is used.
484                                 // Convert the number of selected bookmarks to a string.
485                                 String numberOfBookmarksString = String.valueOf(selectedBookmarksIdsLongArray.length);
486
487                                 // Russian follows rule #7 at <https://developer.mozilla.org/en-US/docs/Mozilla/Localization/Localization_and_Plurals>.
488                                 if (numberOfBookmarksString.endsWith("1") && !numberOfBookmarksString.equals("11")) {  //  Ends in 1.
489                                     snackbarMessage = numberOfBookmarksString + " " + getString(R.string.bookmarks_deleted_russian_ends_in_1);
490                                 } else if ((numberOfBookmarksString.endsWith("2") || numberOfBookmarksString.endsWith("3") || numberOfBookmarksString.endsWith("4")) &&
491                                         !numberOfBookmarksString.equals("12") && !numberOfBookmarksString.equals("13") && !numberOfBookmarksString.equals("14")) {  // Ends in 2-4.
492                                     snackbarMessage = numberOfBookmarksString + " " + getString(R.string.bookmarks_deleted_russian_ends_in_2);
493                                 } else {  // Everything else.
494                                     snackbarMessage = numberOfBookmarksString + " " + getString(R.string.bookmarks_deleted_russian_everything_else);
495                                 }
496                             } else {  // Another language is used.
497                                 snackbarMessage = selectedBookmarksIdsLongArray.length + " " + getString(R.string.bookmarks_deleted);
498                             }
499                         }
500
501                         // Show a SnackBar.
502                         bookmarksDeletedSnackbar = Snackbar.make(findViewById(R.id.bookmarks_coordinatorlayout), snackbarMessage, Snackbar.LENGTH_LONG)
503                                 .setAction(R.string.undo, view -> {
504                                     // Do nothing because everything will be handled by `onDismissed()` below.
505                                 })
506                                 .addCallback(new Snackbar.Callback() {
507                                     @Override
508                                     public void onDismissed(Snackbar snackbar, int event) {
509                                         switch (event) {
510                                             // The user pushed the `Undo` button.
511                                             case Snackbar.Callback.DISMISS_EVENT_ACTION:
512                                                 // Update `bookmarksCursor` with the current contents of the bookmarks database, including the "deleted" bookmarks.
513                                                 bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
514
515                                                 // Update the `ListView`.
516                                                 bookmarksCursorAdapter.changeCursor(bookmarksCursor);
517
518                                                 // Re-select the previously selected bookmarks.
519                                                 for (int i = 0; i < selectedBookmarksPositionsSparseBooleanArray.size(); i++) {
520                                                     bookmarksListView.setItemChecked(selectedBookmarksPositionsSparseBooleanArray.keyAt(i), true);
521                                                 }
522
523                                                 break;
524
525                                             // The `Snackbar` was dismissed without the `Undo` button being pushed.
526                                             default:
527                                                 // Delete each selected bookmark.
528                                                 for (long databaseIdLong : selectedBookmarksIdsLongArray) {
529                                                     // Convert `databaseIdLong` to an int.
530                                                     int databaseIdInt = (int) databaseIdLong;
531
532                                                     // Delete the contents of the folder if the selected bookmark is a folder.
533                                                     if (bookmarksDatabaseHelper.isFolder(databaseIdInt)) {
534                                                         deleteBookmarkFolderContents(databaseIdInt);
535                                                     }
536
537                                                     // Delete the selected bookmark.
538                                                     bookmarksDatabaseHelper.deleteBookmark(databaseIdInt);
539                                                 }
540
541                                                 // Update the display order.
542                                                 for (int i = 0; i < bookmarksListView.getCount(); i++) {
543                                                     // Get the database ID for the current bookmark.
544                                                     int currentBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(i);
545
546                                                     // Move `bookmarksCursor` to the current bookmark position.
547                                                     bookmarksCursor.moveToPosition(i);
548
549                                                     // Update the display order only if it is not correct in the database.
550                                                     if (bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER)) != i) {
551                                                         bookmarksDatabaseHelper.updateDisplayOrder(currentBookmarkDatabaseId, i);
552                                                     }
553                                                 }
554                                         }
555
556                                         // Enable the delete bookmarks menu item.
557                                         deleteBookmarksMenuItem.setEnabled(true);
558
559                                         // Reset the deleting bookmarks flag.
560                                         deletingBookmarks = false;
561
562                                         // Close the activity if back has been pressed.
563                                         if (closeActivityAfterDismissingSnackbar) {
564                                             // Update the bookmarks folder for the bookmarks drawer in the main WebView activity.
565                                             MainWebViewActivity.currentBookmarksFolder = currentFolder;
566
567                                             // Close the bookmarks drawer and reload the bookmarks ListView when returning to the main WebView activity.
568                                             MainWebViewActivity.restartFromBookmarksActivity = true;
569
570                                             // Return to `MainWebViewActivity`.
571                                             NavUtils.navigateUpFromSameTask(activity);
572                                         }
573                                     }
574                                 });
575
576                         //Show the `SnackBar`.
577                         bookmarksDeletedSnackbar.show();
578
579                         // Close the `ActionBar`.
580                         mode.finish();
581                         break;
582
583                     case R.id.context_menu_select_all_bookmarks:
584                         // Get the total number of bookmarks.
585                         int numberOfBookmarks = bookmarksListView.getCount();
586
587                         // Select them all.
588                         for (int i = 0; i < numberOfBookmarks; i++) {
589                             bookmarksListView.setItemChecked(i, true);
590                         }
591                         break;
592                 }
593
594                 // Consume the click.
595                 return true;
596             }
597
598             @Override
599             public void onDestroyActionMode(ActionMode mode) {
600                 // Do nothing.
601             }
602         });
603
604         // Get handles for the `FloatingActionButtons`.
605         FloatingActionButton createBookmarkFolderFab = findViewById(R.id.create_bookmark_folder_fab);
606         FloatingActionButton createBookmarkFab = findViewById(R.id.create_bookmark_fab);
607
608         // Set the create new bookmark folder FAB to display the `AlertDialog`.
609         createBookmarkFolderFab.setOnClickListener(v -> {
610             // Show the `CreateBookmarkFolderDialog` `AlertDialog` and name the instance `@string/create_folder`.
611             AppCompatDialogFragment createBookmarkFolderDialog = new CreateBookmarkFolderDialog();
612             createBookmarkFolderDialog.show(getSupportFragmentManager(), getResources().getString(R.string.create_folder));
613         });
614
615         // Set the create new bookmark FAB to display the `AlertDialog`.
616         createBookmarkFab.setOnClickListener(view -> {
617             // Show the `CreateBookmarkDialog` `AlertDialog` and name the instance `@string/create_bookmark`.
618             AppCompatDialogFragment createBookmarkDialog = new CreateBookmarkDialog();
619             createBookmarkDialog.show(getSupportFragmentManager(), getResources().getString(R.string.create_bookmark));
620         });
621     }
622
623     @Override
624     public boolean onCreateOptionsMenu(Menu menu) {
625         // Inflate the menu.
626         getMenuInflater().inflate(R.menu.bookmarks_options_menu, menu);
627
628         // Success.
629         return true;
630     }
631
632     @Override
633     public boolean onOptionsItemSelected(MenuItem menuItem) {
634         // Get the ID of the menu item that was selected.
635         int menuItemId = menuItem.getItemId();
636
637         switch (menuItemId) {
638             case android.R.id.home:  // The home arrow is identified as `android.R.id.home`, not just `R.id.home`.
639                 if (currentFolder.isEmpty()) {  // Currently in the home folder.
640                     // Go home.
641                     if ((bookmarksDeletedSnackbar != null) && bookmarksDeletedSnackbar.isShown()) {  // Close the bookmarks delete snackbar before going home.
642                         // Set the close flag.
643                         closeActivityAfterDismissingSnackbar = true;
644
645                         // Dismiss the snackbar.
646                         bookmarksDeletedSnackbar.dismiss();
647                     } else {  // Go home immediately.
648                         // Update the bookmarks folder for the bookmarks drawer in `MainWebViewActivity`.
649                         MainWebViewActivity.currentBookmarksFolder = "";
650
651                         // Close the bookmarks drawer and reload the bookmarks `ListView` when returning to `MainWebViewActivity`.
652                         MainWebViewActivity.restartFromBookmarksActivity = true;
653
654                         // Return to `MainWebViewActivity`.
655                         NavUtils.navigateUpFromSameTask(this);
656                     }
657                 } else {  // Currently in a subfolder.
658                     // Place the former parent folder in `currentFolder`.
659                     currentFolder = bookmarksDatabaseHelper.getParentFolder(currentFolder);
660
661                     // Load the new folder.
662                     loadFolder();
663                 }
664                 break;
665
666             case R.id.options_menu_select_all_bookmarks:
667                 // Get the total number of bookmarks.
668                 int numberOfBookmarks = bookmarksListView.getCount();
669
670                 // Select them all.
671                 for (int i = 0; i < numberOfBookmarks; i++) {
672                     bookmarksListView.setItemChecked(i, true);
673                 }
674                 break;
675
676             case R.id.bookmarks_database_view:
677                 // Launch `BookmarksDatabaseViewActivity`.
678                 Intent bookmarksDatabaseViewIntent = new Intent(this, BookmarksDatabaseViewActivity.class);
679                 startActivity(bookmarksDatabaseViewIntent);
680                 break;
681         }
682         return true;
683     }
684
685     @Override
686     public void onBackPressed() {
687         // 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 ListView in the bookmarks drawer.
688         if ((bookmarksDeletedSnackbar != null) && bookmarksDeletedSnackbar.isShown()) {  // Close the bookmarks delete snackbar before going home.
689             // Set the close flag.
690             closeActivityAfterDismissingSnackbar = true;
691
692             // Dismiss the snackbar.
693             bookmarksDeletedSnackbar.dismiss();
694         } else {  // Go home immediately.
695             // Update the bookmarks folder for the bookmarks drawer in the main WebView activity.
696             MainWebViewActivity.currentBookmarksFolder = currentFolder;
697
698             // Close the bookmarks drawer and reload the bookmarks ListView when returning to the main WebView activity.
699             MainWebViewActivity.restartFromBookmarksActivity = true;
700
701             // Exit `BookmarksActivity`.
702             super.onBackPressed();
703         }
704     }
705
706     @Override
707     public void onCreateBookmark(AppCompatDialogFragment dialogFragment) {
708         // Get the `EditTexts` from the `dialogFragment`.
709         EditText createBookmarkNameEditText = dialogFragment.getDialog().findViewById(R.id.create_bookmark_name_edittext);
710         EditText createBookmarkUrlEditText = dialogFragment.getDialog().findViewById(R.id.create_bookmark_url_edittext);
711
712         // Extract the strings from the `EditTexts`.
713         String bookmarkNameString = createBookmarkNameEditText.getText().toString();
714         String bookmarkUrlString = createBookmarkUrlEditText.getText().toString();
715
716         // Convert the favoriteIcon Bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
717         ByteArrayOutputStream favoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
718         MainWebViewActivity.favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, favoriteIconByteArrayOutputStream);
719         byte[] favoriteIconByteArray = favoriteIconByteArrayOutputStream.toByteArray();
720
721         // Display the new bookmark below the current items in the (0 indexed) list.
722         int newBookmarkDisplayOrder = bookmarksListView.getCount();
723
724         // Create the bookmark.
725         bookmarksDatabaseHelper.createBookmark(bookmarkNameString, bookmarkUrlString, currentFolder, newBookmarkDisplayOrder, favoriteIconByteArray);
726
727         // Update `bookmarksCursor` with the current contents of this folder.
728         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
729
730         // Update the `ListView`.
731         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
732
733         // Scroll to the new bookmark.
734         bookmarksListView.setSelection(newBookmarkDisplayOrder);
735     }
736
737     @Override
738     public void onCreateBookmarkFolder(AppCompatDialogFragment dialogFragment) {
739         // Get handles for the views in `dialogFragment`.
740         EditText createFolderNameEditText = dialogFragment.getDialog().findViewById(R.id.create_folder_name_edittext);
741         RadioButton defaultFolderIconRadioButton = dialogFragment.getDialog().findViewById(R.id.create_folder_default_icon_radiobutton);
742         ImageView folderIconImageView = dialogFragment.getDialog().findViewById(R.id.create_folder_default_icon);
743
744         // Get new folder name string.
745         String folderNameString = createFolderNameEditText.getText().toString();
746
747         // Get the new folder icon `Bitmap`.
748         Bitmap folderIconBitmap;
749         if (defaultFolderIconRadioButton.isChecked()) {  // Use the default folder icon.
750             // Get the default folder icon and convert it to a `Bitmap`.
751             Drawable folderIconDrawable = folderIconImageView.getDrawable();
752             BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
753             folderIconBitmap = folderIconBitmapDrawable.getBitmap();
754         } else {  // Use the `WebView` favorite icon.
755             folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
756         }
757
758         // Convert `folderIconBitmap` to a byte array.  `0` is for lossless compression (the only option for a PNG).
759         ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
760         folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
761         byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
762
763         // Move all the bookmarks down one in the display order.
764         for (int i = 0; i < bookmarksListView.getCount(); i++) {
765             int databaseId = (int) bookmarksListView.getItemIdAtPosition(i);
766             bookmarksDatabaseHelper.updateDisplayOrder(databaseId, i + 1);
767         }
768
769         // Create the folder, which will be placed at the top of the `ListView`.
770         bookmarksDatabaseHelper.createFolder(folderNameString, currentFolder, folderIconByteArray);
771
772         // Update `bookmarksCursor` with the current contents of this folder.
773         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
774
775         // Update the `ListView`.
776         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
777
778         // Scroll to the new folder.
779         bookmarksListView.setSelection(0);
780     }
781
782     @Override
783     public void onSaveBookmark(AppCompatDialogFragment dialogFragment, int selectedBookmarkDatabaseId) {
784         // Get handles for the views from `dialogFragment`.
785         EditText editBookmarkNameEditText = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_name_edittext);
786         EditText editBookmarkUrlEditText = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_url_edittext);
787         RadioButton currentBookmarkIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_current_icon_radiobutton);
788
789         // Store the bookmark strings.
790         String bookmarkNameString = editBookmarkNameEditText.getText().toString();
791         String bookmarkUrlString = editBookmarkUrlEditText.getText().toString();
792
793         // Update the bookmark.
794         if (currentBookmarkIconRadioButton.isChecked()) {  // Update the bookmark without changing the favorite icon.
795             bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString);
796         } else {  // Update the bookmark using the `WebView` favorite icon.
797             // Convert the favorite icon to a byte array.  `0` is for lossless compression (the only option for a PNG).
798             ByteArrayOutputStream newFavoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
799             MainWebViewActivity.favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFavoriteIconByteArrayOutputStream);
800             byte[] newFavoriteIconByteArray = newFavoriteIconByteArrayOutputStream.toByteArray();
801
802             //  Update the bookmark and the favorite icon.
803             bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString, newFavoriteIconByteArray);
804         }
805
806         // Close the contextual action mode.
807         contextualActionMode.finish();
808
809         // Update `bookmarksCursor` with the contents of the current folder.
810         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
811
812         // Update the `ListView`.
813         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
814     }
815
816     @Override
817     public void onSaveBookmarkFolder(AppCompatDialogFragment dialogFragment, int selectedFolderDatabaseId) {
818         // Get handles for the views from `dialogFragment`.
819         RadioButton currentFolderIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_folder_current_icon_radiobutton);
820         RadioButton defaultFolderIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon_radiobutton);
821         ImageView defaultFolderIconImageView = dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon_imageview);
822         EditText editFolderNameEditText = dialogFragment.getDialog().findViewById(R.id.edit_folder_name_edittext);
823
824         // Get the new folder name.
825         String newFolderNameString = editFolderNameEditText.getText().toString();
826
827         // Check if the favorite icon has changed.
828         if (currentFolderIconRadioButton.isChecked()) {  // Only the name has changed.
829             // Update the name in the database.
830             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, oldFolderNameString, newFolderNameString);
831         } else if (!currentFolderIconRadioButton.isChecked() && newFolderNameString.equals(oldFolderNameString)) {  // Only the icon has changed.
832             // Get the new folder icon `Bitmap`.
833             Bitmap folderIconBitmap;
834             if (defaultFolderIconRadioButton.isChecked()) {
835                 // Get the default folder icon and convert it to a `Bitmap`.
836                 Drawable folderIconDrawable = defaultFolderIconImageView.getDrawable();
837                 BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
838                 folderIconBitmap = folderIconBitmapDrawable.getBitmap();
839             } else {  // Use the `WebView` favorite icon.
840                 folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
841             }
842
843             // Convert the folder `Bitmap` to a byte array.  `0` is for lossless compression (the only option for a PNG).
844             ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
845             folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
846             byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
847
848             // Update the folder icon in the database.
849             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, folderIconByteArray);
850         } else {  // The folder icon and the name have changed.
851             // Instantiate the new folder icon `Bitmap`.
852             Bitmap folderIconBitmap;
853
854             // Populate the new folder icon bitmap.
855             if (defaultFolderIconRadioButton.isChecked()) {
856                 // Get the default folder icon and convert it to a `Bitmap`.
857                 Drawable folderIconDrawable = defaultFolderIconImageView.getDrawable();
858                 BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
859                 folderIconBitmap = folderIconBitmapDrawable.getBitmap();
860             } else {  // Use the `WebView` favorite icon.
861                 folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
862             }
863
864             // Convert the folder `Bitmap` to a byte array.  `0` is for lossless compression (the only option for a PNG).
865             ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
866             folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
867             byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
868
869             // Update the folder name and icon in the database.
870             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, oldFolderNameString, newFolderNameString, folderIconByteArray);
871         }
872
873         // Update `bookmarksCursor` with the current contents of this folder.
874         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
875
876         // Update the `ListView`.
877         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
878
879         // Close the contextual action mode.
880         contextualActionMode.finish();
881     }
882
883     @Override
884     public void onMoveToFolder(AppCompatDialogFragment dialogFragment) {
885         // Get a handle for the `ListView` from `dialogFragment`.
886         ListView folderListView = dialogFragment.getDialog().findViewById(R.id.move_to_folder_listview);
887
888         // Store a long array of the selected folders.
889         long[] newFolderLongArray = folderListView.getCheckedItemIds();
890
891         // Get the new folder database ID.  Only one folder will be selected.
892         int newFolderDatabaseId = (int) newFolderLongArray[0];
893
894         // Instantiate `newFolderName`.
895         String newFolderName;
896
897         // Set the new folder name.
898         if (newFolderDatabaseId == 0) {
899             // The new folder is the home folder, represented as `""` in the database.
900             newFolderName = "";
901         } else {
902             // Get the new folder name from the database.
903             newFolderName = bookmarksDatabaseHelper.getFolderName(newFolderDatabaseId);
904         }
905
906         // Get a long array with the the database ID of the selected bookmarks.
907         long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
908
909         // Move each of the selected bookmarks to the new folder.
910         for (long databaseIdLong : selectedBookmarksLongArray) {
911             // Get `databaseIdInt` for each selected bookmark.
912             int databaseIdInt = (int) databaseIdLong;
913
914             // Move the selected bookmark to the new folder.
915             bookmarksDatabaseHelper.moveToFolder(databaseIdInt, newFolderName);
916         }
917
918         // Update `bookmarksCursor` with the current contents of this folder.
919         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
920
921         // Update the `ListView`.
922         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
923
924         // Close the contextual app bar.
925         contextualActionMode.finish();
926     }
927
928     private void deleteBookmarkFolderContents(int databaseId) {
929         // Get the name of the folder.
930         String folderName = bookmarksDatabaseHelper.getFolderName(databaseId);
931
932         // Get the contents of the folder.
933         Cursor folderCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(folderName);
934
935         // Delete each of the bookmarks in the folder.
936         for (int i = 0; i < folderCursor.getCount(); i++) {
937             // Move `folderCursor` to the current row.
938             folderCursor.moveToPosition(i);
939
940             // Get the database ID of the item.
941             int itemDatabaseId = folderCursor.getInt(folderCursor.getColumnIndex(BookmarksDatabaseHelper._ID));
942
943             // If this is a folder, recursively delete the contents first.
944             if (bookmarksDatabaseHelper.isFolder(itemDatabaseId)) {
945                 deleteBookmarkFolderContents(itemDatabaseId);
946             }
947
948             // Delete the bookmark.
949             bookmarksDatabaseHelper.deleteBookmark(itemDatabaseId);
950         }
951     }
952
953     private void updateMoveIcons() {
954         // Get a long array of the selected bookmarks.
955         long[] selectedBookmarksLongArray = bookmarksListView.getCheckedItemIds();
956
957         // Get the database IDs for the first, last, and selected bookmarks.
958         int selectedBookmarkDatabaseId = (int) selectedBookmarksLongArray[0];
959         int firstBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(0);
960         // bookmarksListView is 0 indexed.
961         int lastBookmarkDatabaseId = (int) bookmarksListView.getItemIdAtPosition(bookmarksListView.getCount() - 1);
962
963         // Update the move bookmark up `MenuItem`.
964         if (selectedBookmarkDatabaseId == firstBookmarkDatabaseId) {  // The selected bookmark is in the first position.
965             // Disable the move bookmark up `MenuItem`.
966             moveBookmarkUpMenuItem.setEnabled(false);
967
968             //  Set the move bookmark up icon to be ghosted.
969             moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_disabled);
970         } else {  // The selected bookmark is not in the first position.
971             // Enable the move bookmark up `MenuItem`.
972             moveBookmarkUpMenuItem.setEnabled(true);
973
974             // Set the icon according to the theme.
975             if (MainWebViewActivity.darkTheme) {
976                 moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_enabled_dark);
977             } else {
978                 moveBookmarkUpMenuItem.setIcon(R.drawable.move_up_enabled_light);
979             }
980         }
981
982         // Update the move bookmark down `MenuItem`.
983         if (selectedBookmarkDatabaseId == lastBookmarkDatabaseId) {  // The selected bookmark is in the last position.
984             // Disable the move bookmark down `MenuItem`.
985             moveBookmarkDownMenuItem.setEnabled(false);
986
987             // Set the move bookmark down icon to be ghosted.
988             moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_disabled);
989         } else {  // The selected bookmark is not in the last position.
990             // Enable the move bookmark down `MenuItem`.
991             moveBookmarkDownMenuItem.setEnabled(true);
992
993             // Set the icon according to the theme.
994             if (MainWebViewActivity.darkTheme) {
995                 moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_enabled_dark);
996             } else {
997                 moveBookmarkDownMenuItem.setIcon(R.drawable.move_down_enabled_light);
998             }
999         }
1000     }
1001
1002     private void scrollBookmarks(int selectedBookmarkPosition) {
1003         // Get the first and last visible bookmark positions.
1004         int firstVisibleBookmarkPosition = bookmarksListView.getFirstVisiblePosition();
1005         int lastVisibleBookmarkPosition = bookmarksListView.getLastVisiblePosition();
1006
1007         // Calculate the number of bookmarks per screen.
1008         int numberOfBookmarksPerScreen = lastVisibleBookmarkPosition - firstVisibleBookmarkPosition;
1009
1010         // Scroll with the moved bookmark if necessary.
1011         if (selectedBookmarkPosition <= firstVisibleBookmarkPosition) {  // The selected bookmark position is at or above the top of the screen.
1012             // Scroll to the selected bookmark position.
1013             bookmarksListView.setSelection(selectedBookmarkPosition);
1014         } else if (selectedBookmarkPosition >= (lastVisibleBookmarkPosition - 1)) {  // The selected bookmark is at or below the bottom of the screen.  The `-1` handles partial bookmarks displayed at the bottom of the `ListView`.
1015             // Scroll to display the selected bookmark at the bottom of the screen.  `+1` assured that the entire bookmark will be displayed in situations where only a partial bookmark fits at the bottom of the `ListView`.
1016             bookmarksListView.setSelection(selectedBookmarkPosition - numberOfBookmarksPerScreen + 1);
1017         }
1018     }
1019
1020     private void loadFolder() {
1021         // Update `bookmarksCursor` with the contents of the bookmarks database for the current folder.
1022         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursorByDisplayOrder(currentFolder);
1023
1024         // Setup a `CursorAdapter`.  `this` specifies the `Context`.  `false` disables `autoRequery`.
1025         bookmarksCursorAdapter = new CursorAdapter(this, bookmarksCursor, false) {
1026             @Override
1027             public View newView(Context context, Cursor cursor, ViewGroup parent) {
1028                 // Inflate the individual item layout.  `false` does not attach it to the root.
1029                 return getLayoutInflater().inflate(R.layout.bookmarks_activity_item_linearlayout, parent, false);
1030             }
1031
1032             @Override
1033             public void bindView(View view, Context context, Cursor cursor) {
1034                 // Get handles for the views.
1035                 ImageView bookmarkFavoriteIcon = view.findViewById(R.id.bookmark_favorite_icon);
1036                 TextView bookmarkNameTextView = view.findViewById(R.id.bookmark_name);
1037
1038                 // Get the favorite icon byte array from the `Cursor`.
1039                 byte[] favoriteIconByteArray = cursor.getBlob(cursor.getColumnIndex(BookmarksDatabaseHelper.FAVORITE_ICON));
1040
1041                 // Convert the byte array to a `Bitmap` beginning at the first byte and ending at the last.
1042                 Bitmap favoriteIconBitmap = BitmapFactory.decodeByteArray(favoriteIconByteArray, 0, favoriteIconByteArray.length);
1043
1044                 // Display the bitmap in `bookmarkFavoriteIcon`.
1045                 bookmarkFavoriteIcon.setImageBitmap(favoriteIconBitmap);
1046
1047                 // Get the bookmark name from the cursor and display it in `bookmarkNameTextView`.
1048                 String bookmarkNameString = cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
1049                 bookmarkNameTextView.setText(bookmarkNameString);
1050
1051                 // Make the font bold for folders.
1052                 if (cursor.getInt(cursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1) {
1053                     bookmarkNameTextView.setTypeface(Typeface.DEFAULT_BOLD);
1054                 } else {  // Reset the font to default for normal bookmarks.
1055                     bookmarkNameTextView.setTypeface(Typeface.DEFAULT);
1056                 }
1057             }
1058         };
1059
1060         // Populate the `ListView` with the adapter.
1061         bookmarksListView.setAdapter(bookmarksCursorAdapter);
1062
1063         // Set the `AppBar` title.
1064         if (currentFolder.isEmpty()) {
1065             appBar.setTitle(R.string.bookmarks);
1066         } else {
1067             appBar.setTitle(currentFolder);
1068         }
1069     }
1070
1071     @Override
1072     public void onDestroy() {
1073         // Close the bookmarks cursor and database.
1074         bookmarksCursor.close();
1075         bookmarksDatabaseHelper.close();
1076
1077         // Run the default commands.
1078         super.onDestroy();
1079     }
1080 }