app/src/main/java/com/stoutner/privacybrowser/activities/BookmarksDatabaseViewActivity.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.content.Context;
  23 import android.database.Cursor;
  24 import android.database.MatrixCursor;
  25 import android.database.MergeCursor;
  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.Snackbar;
  33 import android.support.v4.content.ContextCompat;
  34 import android.support.v4.widget.CursorAdapter;
  35 import android.support.v4.widget.ResourceCursorAdapter;
  36 import android.support.v7.app.ActionBar;
  37 import android.support.v7.app.AppCompatActivity;
  38 // `AppCompatDialogFragment` is required instead of `DialogFragment` or an error is produced on API <=22.
  39 import android.support.v7.app.AppCompatDialogFragment;
  40 import android.support.v7.widget.Toolbar;
  41 import android.util.SparseBooleanArray;
  42 import android.view.ActionMode;
  43 import android.view.Menu;
  44 import android.view.MenuItem;
  45 import android.view.View;
  46 import android.view.ViewGroup;
  47 import android.view.WindowManager;
  48 import android.widget.AbsListView;
  49 import android.widget.AdapterView;
  50 import android.widget.EditText;
  51 import android.widget.ImageView;
  52 import android.widget.ListView;
  53 import android.widget.RadioButton;
  54 import android.widget.Spinner;
  55 import android.widget.TextView;
  56
  57 import com.stoutner.privacybrowser.R;
  58 import com.stoutner.privacybrowser.dialogs.EditBookmarkDatabaseViewDialog;
  59 import com.stoutner.privacybrowser.dialogs.EditBookmarkFolderDatabaseViewDialog;
  60 import com.stoutner.privacybrowser.helpers.BookmarksDatabaseHelper;
  61
  62 import java.io.ByteArrayOutputStream;
  63 import java.util.Arrays;
  64
  65 public class BookmarksDatabaseViewActivity extends AppCompatActivity implements EditBookmarkDatabaseViewDialog.EditBookmarkDatabaseViewListener,
  66         EditBookmarkFolderDatabaseViewDialog.EditBookmarkFolderDatabaseViewListener {
  67     // Instantiate the constants.
  68     private static final int ALL_FOLDERS_DATABASE_ID = -2;
  69     private static final int HOME_FOLDER_DATABASE_ID = -1;
  70
  71     // `bookmarksDatabaseHelper` is used in `onCreate()`, `updateBookmarksListView()`, `selectAllBookmarksInFolder()`, and `onDestroy()`.
  72     private BookmarksDatabaseHelper bookmarksDatabaseHelper;
  73
  74     // `bookmarksCursor` is used in `onCreate()`, `updateBookmarksListView()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, and `onDestroy()`.
  75     private Cursor bookmarksCursor;
  76
  77     // `bookmarksCursorAdapter` is used in `onCreate()`, `selectAllBookmarksInFolder()`, and `updateBookmarksListView()`.
  78     private CursorAdapter bookmarksCursorAdapter;
  79
  80     // `oldFolderNameString` is used in `onCreate()` and `onSaveBookmarkFolder()`.
  81     private String oldFolderNameString;
  82
  83     // `currentFolderDatabaseId` is used in `onCreate()`, `updateBookmarksListView()`, `onSaveBookmark()`, and `onSaveBookmarkFolder()`.
  84     private int currentFolderDatabaseId;
  85
  86     // `currentFolder` is used in `onCreate()`, `onSaveBookmark()`, and `onSaveBookmarkFolder()`.
  87     private String currentFolderName;
  88
  89     // `sortByDisplayOrder` is used in `onCreate()`, `onOptionsItemSelected()`, and `updateBookmarksListView()`.
  90     private boolean sortByDisplayOrder;
  91
  92     // `bookmarksDeletedSnackbar` is used in `onCreate()`, `onOptionsItemSelected()`, and `onBackPressed()`.
  93     private Snackbar bookmarksDeletedSnackbar;
  94
  95     // `closeActivityAfterDismissingSnackbar` is used in `onCreate()`, `onOptionsItemSelected()`, and `onBackPressed()`.
  96     private boolean closeActivityAfterDismissingSnackbar;
  97
  98     @Override
  99     public void onCreate(Bundle savedInstanceState) {
 100         // Disable screenshots if not allowed.
 101         if (!MainWebViewActivity.allowScreenshots) {
 102             getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
 103         }
 104
 105         // Set the activity theme.
 106         if (MainWebViewActivity.darkTheme) {
 107             setTheme(R.style.PrivacyBrowserDark_SecondaryActivity);
 108         } else {
 109             setTheme(R.style.PrivacyBrowserLight_SecondaryActivity);
 110         }
 111
 112         // Run the default commands.
 113         super.onCreate(savedInstanceState);
 114
 115         // Set the content view.
 116         setContentView(R.layout.bookmarks_databaseview_coordinatorlayout);
 117
 118         // The `SupportActionBar` from `android.support.v7.app.ActionBar` must be used until the minimum API is >= 21.
 119         Toolbar bookmarksDatabaseViewAppBar = findViewById(R.id.bookmarks_databaseview_toolbar);
 120         setSupportActionBar(bookmarksDatabaseViewAppBar);
 121
 122         // Get a handle for the `AppBar`.
 123         ActionBar appBar = getSupportActionBar();
 124
 125         // Remove the incorrect warning in Android Studio that `appBar` might be null.
 126         assert appBar != null;
 127
 128         // Display the spinner and the back arrow in the app bar.
 129         appBar.setCustomView(R.layout.spinner);
 130         appBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM | ActionBar.DISPLAY_HOME_AS_UP);
 131
 132         // Initialize the database handler.  The `0` is to specify a database version, but that is set instead using a constant in `BookmarksDatabaseHelper`.
 133         bookmarksDatabaseHelper = new BookmarksDatabaseHelper(this, null, null, 0);
 134
 135         // Setup a matrix cursor for "All Folders" and "Home Folder".
 136         String[] matrixCursorColumnNames = {BookmarksDatabaseHelper._ID, BookmarksDatabaseHelper.BOOKMARK_NAME};
 137         MatrixCursor matrixCursor = new MatrixCursor(matrixCursorColumnNames);
 138         matrixCursor.addRow(new Object[]{ALL_FOLDERS_DATABASE_ID, getString(R.string.all_folders)});
 139         matrixCursor.addRow(new Object[]{HOME_FOLDER_DATABASE_ID, getString(R.string.home_folder)});
 140
 141         // Get a cursor with the list of all the folders.
 142         Cursor foldersCursor = bookmarksDatabaseHelper.getAllFolders();
 143
 144         // Combine `matrixCursor` and `foldersCursor`.
 145         MergeCursor foldersMergeCursor = new MergeCursor(new Cursor[]{matrixCursor, foldersCursor});
 146
 147
 148         // Get the default folder bitmap.  `ContextCompat` must be used until the minimum API >= 21.
 149         Drawable defaultFolderDrawable = ContextCompat.getDrawable(getApplicationContext(), R.drawable.folder_blue_bitmap);
 150
 151         // Cast the default folder drawable to a `BitmapDrawable`.
 152         BitmapDrawable defaultFolderBitmapDrawable = (BitmapDrawable) defaultFolderDrawable;
 153
 154         // Remove the incorrect lint warning that `.getBitmap()` might be null.
 155         assert defaultFolderBitmapDrawable != null;
 156
 157         // Convert the default folder `BitmapDrawable` to a bitmap.
 158         Bitmap defaultFolderBitmap = defaultFolderBitmapDrawable.getBitmap();
 159
 160
 161         // Create a resource cursor adapter for the spinner.
 162         ResourceCursorAdapter foldersCursorAdapter = new ResourceCursorAdapter(this, R.layout.appbar_spinner_item, foldersMergeCursor, 0) {
 163             @Override
 164             public void bindView(View view, Context context, Cursor cursor) {
 165                 // Get handles for the spinner views.
 166                 ImageView spinnerItemImageView = view.findViewById(R.id.spinner_item_imageview);
 167                 TextView spinnerItemTextView = view.findViewById(R.id.spinner_item_textview);
 168
 169                 // Set the folder icon according to the type.
 170                 if (foldersMergeCursor.getPosition() > 1) {  // Set a user folder icon.
 171                     // Initialize a default folder icon byte array output stream.
 172                     ByteArrayOutputStream defaultFolderIconByteArrayOutputStream = new ByteArrayOutputStream();
 173
 174                     // Covert the default folder bitmap to a PNG and store it in the output stream.  `0` is for lossless compression (the only option for a PNG).
 175                     defaultFolderBitmap.compress(Bitmap.CompressFormat.PNG, 0, defaultFolderIconByteArrayOutputStream);
 176
 177                     // Convert the default folder icon output stream to a byte array.
 178                     byte[] defaultFolderIconByteArray = defaultFolderIconByteArrayOutputStream.toByteArray();
 179
 180
 181                     // Get the folder icon byte array from the cursor.
 182                     byte[] folderIconByteArray = cursor.getBlob(cursor.getColumnIndex(BookmarksDatabaseHelper.FAVORITE_ICON));
 183
 184                     // Convert the byte array to a bitmap beginning at the first byte and ending at the last.
 185                     Bitmap folderIconBitmap = BitmapFactory.decodeByteArray(folderIconByteArray, 0, folderIconByteArray.length);
 186
 187
 188                     // Set the icon according to the type.
 189                     if (Arrays.equals(folderIconByteArray, defaultFolderIconByteArray)) {  // The default folder icon is used.
 190                         // Set a smaller and darker folder icon, which works well with the spinner.
 191                         spinnerItemImageView.setImageDrawable(ContextCompat.getDrawable(context, R.drawable.folder_dark_blue));
 192                     } else {  // A custom folder icon is uses.
 193                         // Set the folder image stored in the cursor.
 194                         spinnerItemImageView.setImageBitmap(folderIconBitmap);
 195                     }
 196                 } else {  // Set the `All Folders` or `Home Folder` icon.
 197                     // Set the gray folder image.  `ContextCompat` must be used until the minimum API >= 21.
 198                     spinnerItemImageView.setImageDrawable(ContextCompat.getDrawable(context, R.drawable.folder_gray));
 199                 }
 200
 201                 // Set the text view to display the folder name.
 202                 spinnerItemTextView.setText(cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME)));
 203             }
 204         };
 205
 206         // Set the resource cursor adapter drop drown view resource.
 207         foldersCursorAdapter.setDropDownViewResource(R.layout.appbar_spinner_dropdown_item);
 208
 209         // Get a handle for the folder spinner and set the adapter.
 210         Spinner folderSpinner = findViewById(R.id.spinner);
 211         folderSpinner.setAdapter(foldersCursorAdapter);
 212
 213         // Handle taps on the spinner dropdown.
 214         folderSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
 215             @Override
 216             public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
 217                 // Store the current folder database ID.
 218                 currentFolderDatabaseId = (int) id;
 219
 220                 // Get a handle for the selected view.
 221                 TextView selectedFolderTextView = findViewById(R.id.spinner_item_textview);
 222
 223                 // Store the current folder name.
 224                 currentFolderName = selectedFolderTextView.getText().toString();
 225
 226                 // Update the list view.
 227                 updateBookmarksListView();
 228             }
 229
 230             @Override
 231             public void onNothingSelected(AdapterView<?> parent) {
 232                 // Do nothing.
 233             }
 234         });
 235
 236         // Get a handle for the bookmarks `ListView`.
 237         ListView bookmarksListView = findViewById(R.id.bookmarks_databaseview_listview);
 238
 239         // Get a `Cursor` with the current contents of the bookmarks database.
 240         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarks();
 241
 242         // Setup a `CursorAdapter` with `this` context.  `false` disables autoRequery.
 243         bookmarksCursorAdapter = new CursorAdapter(this, bookmarksCursor, false) {
 244             @Override
 245             public View newView(Context context, Cursor cursor, ViewGroup parent) {
 246                 // Inflate the individual item layout.  `false` does not attach it to the root.
 247                 return getLayoutInflater().inflate(R.layout.bookmarks_databaseview_item_linearlayout, parent, false);
 248             }
 249
 250             @Override
 251             public void bindView(View view, Context context, Cursor cursor) {
 252                 boolean isFolder = (cursor.getInt(cursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1);
 253
 254                 // Get the database ID from the `Cursor` and display it in `bookmarkDatabaseIdTextView`.
 255                 int bookmarkDatabaseId = cursor.getInt(cursor.getColumnIndex(BookmarksDatabaseHelper._ID));
 256                 TextView bookmarkDatabaseIdTextView = view.findViewById(R.id.bookmarks_databaseview_database_id);
 257                 bookmarkDatabaseIdTextView.setText(String.valueOf(bookmarkDatabaseId));
 258
 259                 // Get the favorite icon byte array from the `Cursor`.
 260                 byte[] favoriteIconByteArray = cursor.getBlob(cursor.getColumnIndex(BookmarksDatabaseHelper.FAVORITE_ICON));
 261                 // Convert the byte array to a `Bitmap` beginning at the beginning at the first byte and ending at the last.
 262                 Bitmap favoriteIconBitmap = BitmapFactory.decodeByteArray(favoriteIconByteArray, 0, favoriteIconByteArray.length);
 263                 // Display the bitmap in `bookmarkFavoriteIcon`.
 264                 ImageView bookmarkFavoriteIcon = view.findViewById(R.id.bookmarks_databaseview_favorite_icon);
 265                 bookmarkFavoriteIcon.setImageBitmap(favoriteIconBitmap);
 266
 267                 // Get the bookmark name from the `Cursor` and display it in `bookmarkNameTextView`.
 268                 String bookmarkNameString = cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 269                 TextView bookmarkNameTextView = view.findViewById(R.id.bookmarks_databaseview_bookmark_name);
 270                 bookmarkNameTextView.setText(bookmarkNameString);
 271
 272                 // Make the font bold for folders.
 273                 if (isFolder) {
 274                     // The first argument is `null` prevent changing of the font.
 275                     bookmarkNameTextView.setTypeface(null, Typeface.BOLD);
 276                 } else {  // Reset the font to default.
 277                     bookmarkNameTextView.setTypeface(Typeface.DEFAULT);
 278                 }
 279
 280                 // Get the bookmark URL form the `Cursor` and display it in `bookmarkUrlTextView`.
 281                 String bookmarkUrlString = cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_URL));
 282                 TextView bookmarkUrlTextView = view.findViewById(R.id.bookmarks_databaseview_bookmark_url);
 283                 bookmarkUrlTextView.setText(bookmarkUrlString);
 284
 285                 // Hide the URL if the bookmark is a folder.
 286                 if (isFolder) {
 287                     bookmarkUrlTextView.setVisibility(View.GONE);
 288                 } else {
 289                     bookmarkUrlTextView.setVisibility(View.VISIBLE);
 290                 }
 291
 292                 // Get the display order from the `Cursor` and display it in `bookmarkDisplayOrderTextView`.
 293                 int bookmarkDisplayOrder = cursor.getInt(cursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER));
 294                 TextView bookmarkDisplayOrderTextView = view.findViewById(R.id.bookmarks_databaseview_display_order);
 295                 bookmarkDisplayOrderTextView.setText(String.valueOf(bookmarkDisplayOrder));
 296
 297                 // Get the parent folder from the `Cursor` and display it in `bookmarkParentFolder`.
 298                 String bookmarkParentFolder = cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.PARENT_FOLDER));
 299                 ImageView parentFolderImageView = view.findViewById(R.id.bookmarks_databaseview_parent_folder_icon);
 300                 TextView bookmarkParentFolderTextView = view.findViewById(R.id.bookmarks_databaseview_parent_folder);
 301
 302                 // Make the folder name gray if it is the home folder.
 303                 if (bookmarkParentFolder.isEmpty()) {
 304                     parentFolderImageView.setImageDrawable(ContextCompat.getDrawable(getApplicationContext(), R.drawable.folder_gray));
 305                     bookmarkParentFolderTextView.setText(R.string.home_folder);
 306                     bookmarkParentFolderTextView.setTextColor(ContextCompat.getColor(getApplicationContext(), R.color.gray_500));
 307                 } else {
 308                     parentFolderImageView.setImageDrawable(ContextCompat.getDrawable(getApplicationContext(), R.drawable.folder_dark_blue));
 309                     bookmarkParentFolderTextView.setText(bookmarkParentFolder);
 310
 311                     // Set the text color according to the theme.
 312                     if (MainWebViewActivity.darkTheme) {
 313                         bookmarkParentFolderTextView.setTextColor(ContextCompat.getColor(getApplicationContext(), R.color.gray_300));
 314                     } else {
 315                         bookmarkParentFolderTextView.setTextColor(ContextCompat.getColor(getApplicationContext(), R.color.black));
 316                     }
 317                 }
 318             }
 319         };
 320
 321         // Update the ListView.
 322         bookmarksListView.setAdapter(bookmarksCursorAdapter);
 323
 324         // Set the current folder database ID.
 325         currentFolderDatabaseId = ALL_FOLDERS_DATABASE_ID;
 326
 327         // Set a listener to edit a bookmark when it is tapped.
 328         bookmarksListView.setOnItemClickListener((AdapterView<?> parent, View view, int position, long id) -> {
 329             // Convert the database ID to an int.
 330             int databaseId = (int) id;
 331
 332             // Show the edit bookmark or edit bookmark folder dialog.
 333             if (bookmarksDatabaseHelper.isFolder(databaseId)) {
 334                 // Save the current folder name, which is used in `onSaveBookmarkFolder()`.
 335                 oldFolderNameString = bookmarksCursor.getString(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 336
 337                 // Show the edit bookmark folder dialog.
 338                 AppCompatDialogFragment editBookmarkFolderDatabaseViewDialog = EditBookmarkFolderDatabaseViewDialog.folderDatabaseId(databaseId);
 339                 editBookmarkFolderDatabaseViewDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_folder));
 340             } else {
 341                 // Show the edit bookmark dialog.
 342                 AppCompatDialogFragment editBookmarkDatabaseViewDialog = EditBookmarkDatabaseViewDialog.bookmarkDatabaseId(databaseId);
 343                 editBookmarkDatabaseViewDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_bookmark));
 344             }
 345         });
 346
 347         // Handle long presses on the list view.
 348         bookmarksListView.setMultiChoiceModeListener(new AbsListView.MultiChoiceModeListener() {
 349             // Instantiate the common variables.
 350             MenuItem selectAllMenuItem;
 351             MenuItem deleteMenuItem;
 352             boolean deletingBookmarks;
 353
 354             @Override
 355             public boolean onCreateActionMode(ActionMode mode, Menu menu) {
 356                 // Inflate the menu for the contextual app bar.
 357                 getMenuInflater().inflate(R.menu.bookmarks_databaseview_context_menu, menu);
 358
 359                 // Set the title.
 360                 mode.setTitle(R.string.bookmarks);
 361
 362                 // Get handles for the menu items.
 363                 selectAllMenuItem = menu.findItem(R.id.select_all);
 364                 deleteMenuItem = menu.findItem(R.id.delete);
 365
 366                 // Disable the delete menu item if a delete is pending.
 367                 deleteMenuItem.setEnabled(!deletingBookmarks);
 368
 369                 // Make it so.
 370                 return true;
 371             }
 372
 373             @Override
 374             public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
 375                 // Do nothing.
 376                 return false;
 377             }
 378
 379             @Override
 380             public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
 381                 // Calculate the number of selected bookmarks.
 382                 int numberOfSelectedBookmarks = bookmarksListView.getCheckedItemCount();
 383
 384                 // Adjust the ActionMode according to the number of selected bookmarks.
 385                 mode.setSubtitle(getString(R.string.selected) + "  " + numberOfSelectedBookmarks);
 386
 387                 // Do not show the select all menu item if all the bookmarks are already checked.
 388                 if (bookmarksListView.getCheckedItemCount() == bookmarksListView.getCount()) {
 389                     selectAllMenuItem.setVisible(false);
 390                 } else {
 391                     selectAllMenuItem.setVisible(true);
 392                 }
 393
 394                 // Convert the database ID to an int.
 395                 int databaseId = (int) id;
 396
 397                 // If a folder was selected, also select all the contents.
 398                 if (checked && bookmarksDatabaseHelper.isFolder(databaseId)) {
 399                     selectAllBookmarksInFolder(databaseId);
 400                 }
 401
 402                 // Do not allow a bookmark to be deselected if the folder is selected.
 403                 if (!checked) {
 404                     // Get the folder name.
 405                     String folderName = bookmarksDatabaseHelper.getParentFolderName((int) id);
 406
 407                     // If the bookmark is not in the root folder, check to see if the folder is selected.
 408                     if (!folderName.isEmpty()) {
 409                         // Get the database ID of the folder.
 410                         int folderDatabaseId = bookmarksDatabaseHelper.getFolderDatabaseId(folderName);
 411
 412                         // Move the bookmarks cursor to the first position.
 413                         bookmarksCursor.moveToFirst();
 414
 415                         // Initialize the folder position variable.
 416                         int folderPosition = -1;
 417
 418                         // Get the position of the folder in the bookmarks cursor.
 419                         while ((folderPosition < 0) && (bookmarksCursor.getPosition() < bookmarksCursor.getCount())) {
 420                             // Check if the folder database ID matches the bookmark database ID.
 421                             if (folderDatabaseId == bookmarksCursor.getInt((bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper._ID)))) {
 422                                 // Get the folder position.
 423                                 folderPosition = bookmarksCursor.getPosition();
 424
 425                                 // Check if the folder is selected.
 426                                 if (bookmarksListView.isItemChecked(folderPosition)) {
 427                                     // Reselect the bookmark.
 428                                     bookmarksListView.setItemChecked(position, true);
 429
 430                                     // Display a snackbar explaining why the bookmark cannot be deselected.
 431                                     Snackbar.make(bookmarksListView, R.string.cannot_deselect_bookmark, Snackbar.LENGTH_LONG).show();
 432                                 }
 433                             }
 434
 435                             // Increment the bookmarks cursor.
 436                             bookmarksCursor.moveToNext();
 437                         }
 438                     }
 439                 }
 440             }
 441
 442             @Override
 443             public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
 444                 switch (item.getItemId()) {
 445                     case R.id.select_all:
 446                         // Get the total number of bookmarks.
 447                         int numberOfBookmarks = bookmarksListView.getCount();
 448
 449                         // Select them all.
 450                         for (int i = 0; i < numberOfBookmarks; i++) {
 451                             bookmarksListView.setItemChecked(i, true);
 452                         }
 453                         break;
 454
 455                     case R.id.delete:
 456                         // Set the deleting bookmarks flag, which prevents the delete menu item from being enabled until the current process finishes.
 457                         deletingBookmarks = true;
 458
 459                         // Get an array of the selected row IDs.
 460                         long[] selectedBookmarksIdsLongArray = bookmarksListView.getCheckedItemIds();
 461
 462                         // 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.
 463                         SparseBooleanArray selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions().clone();
 464
 465                         // Update the bookmarks cursor with the current contents of the bookmarks database except for the specified database IDs.
 466                         switch (currentFolderDatabaseId) {
 467                             // Get a cursor with all the folders.
 468                             case ALL_FOLDERS_DATABASE_ID:
 469                                 if (sortByDisplayOrder) {
 470                                     bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksByDisplayOrderExcept(selectedBookmarksIdsLongArray);
 471                                 } else {
 472                                     bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksExcept(selectedBookmarksIdsLongArray);
 473                                 }
 474                                 break;
 475
 476                             // Get a cursor for the home folder.
 477                             case HOME_FOLDER_DATABASE_ID:
 478                                 if (sortByDisplayOrder) {
 479                                     bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrderExcept(selectedBookmarksIdsLongArray, "");
 480                                 } else {
 481                                     bookmarksCursor = bookmarksDatabaseHelper.getBookmarksExcept(selectedBookmarksIdsLongArray, "");
 482                                 }
 483                                 break;
 484
 485                             // Display the selected folder.
 486                             default:
 487                                 // Get a cursor for the selected folder.
 488                                 if (sortByDisplayOrder) {
 489                                     bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrderExcept(selectedBookmarksIdsLongArray, currentFolderName);
 490                                 } else {
 491                                     bookmarksCursor = bookmarksDatabaseHelper.getBookmarksExcept(selectedBookmarksIdsLongArray, currentFolderName);
 492                                 }
 493                         }
 494
 495                         // Update the list view.
 496                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 497
 498                         // Show a Snackbar with the number of deleted bookmarks.
 499                         bookmarksDeletedSnackbar = Snackbar.make(findViewById(R.id.bookmarks_databaseview_coordinatorlayout),
 500                                 getString(R.string.bookmarks_deleted) + "  " + selectedBookmarksIdsLongArray.length, Snackbar.LENGTH_LONG)
 501                                 .setAction(R.string.undo, view -> {
 502                                     // Do nothing because everything will be handled by `onDismissed()` below.
 503                                 })
 504                                 .addCallback(new Snackbar.Callback() {
 505                                     @Override
 506                                     public void onDismissed(Snackbar snackbar, int event) {
 507                                         switch (event) {
 508                                             // The user pushed the `Undo` button.
 509                                             case Snackbar.Callback.DISMISS_EVENT_ACTION:
 510                                                 // Update the bookmarks list view with the current contents of the bookmarks database, including the "deleted bookmarks.
 511                                                 updateBookmarksListView();
 512
 513                                                 // Re-select the previously selected bookmarks.
 514                                                 for (int i = 0; i < selectedBookmarksPositionsSparseBooleanArray.size(); i++) {
 515                                                     bookmarksListView.setItemChecked(selectedBookmarksPositionsSparseBooleanArray.keyAt(i), true);
 516                                                 }
 517                                                 break;
 518
 519                                                 // The Snackbar was dismissed without the `Undo` button being pushed.
 520                                             default:
 521                                                 // Delete each selected bookmark.
 522                                                 for (long databaseIdLong : selectedBookmarksIdsLongArray) {
 523                                                     // Convert `databaseIdLong` to an int.
 524                                                     int databaseIdInt = (int) databaseIdLong;
 525
 526                                                     // Delete the selected bookmark.
 527                                                     bookmarksDatabaseHelper.deleteBookmark(databaseIdInt);
 528                                                 }
 529                                         }
 530
 531                                         // Reset the deleting bookmarks flag.
 532                                         deletingBookmarks = false;
 533
 534                                         // Enable the delete menu item.
 535                                         deleteMenuItem.setEnabled(true);
 536
 537                                         // Close the activity if back has been pressed.
 538                                         if (closeActivityAfterDismissingSnackbar) {
 539                                             onBackPressed();
 540                                         }
 541                                     }
 542                                 });
 543
 544                         // Show the Snackbar.
 545                         bookmarksDeletedSnackbar.show();
 546                         break;
 547                 }
 548
 549                 // Consume the click.
 550                 return false;
 551             }
 552
 553             @Override
 554             public void onDestroyActionMode(ActionMode mode) {
 555                 // Do nothing.
 556             }
 557         });
 558     }
 559
 560     @Override
 561     public boolean onCreateOptionsMenu(Menu menu) {
 562         // Inflate the menu.
 563         getMenuInflater().inflate(R.menu.bookmarks_databaseview_options_menu, menu);
 564
 565         // Success.
 566         return true;
 567     }
 568
 569     @Override
 570     public boolean onOptionsItemSelected(MenuItem menuItem) {
 571         // Get the ID of the menu item that was selected.
 572         int menuItemId = menuItem.getItemId();
 573
 574         switch (menuItemId) {
 575             case android.R.id.home:  // The home arrow is identified as `android.R.id.home`, not just `R.id.home`.
 576                 // Exit the activity.
 577                 onBackPressed();
 578                 break;
 579
 580             case R.id.options_menu_sort:
 581                 // Update the sort by display order tracker.
 582                 sortByDisplayOrder = !sortByDisplayOrder;
 583
 584                 // Get a handle for the bookmarks `ListView`.
 585                 ListView bookmarksListView = findViewById(R.id.bookmarks_databaseview_listview);
 586
 587                 // Update the icon and display a snackbar.
 588                 if (sortByDisplayOrder) {  // Sort by display order.
 589                     // Update the icon according to the theme.
 590                     if (MainWebViewActivity.darkTheme) {
 591                         menuItem.setIcon(R.drawable.sort_selected_dark);
 592                     } else {
 593                         menuItem.setIcon(R.drawable.sort_selected_light);
 594                     }
 595
 596                     // Display a Snackbar indicating the current sort type.
 597                     Snackbar.make(bookmarksListView, R.string.sorted_by_display_order, Snackbar.LENGTH_SHORT).show();
 598                 } else {  // Sort by database id.
 599                     // Update the icon according to the theme.
 600                     if (MainWebViewActivity.darkTheme) {
 601                         menuItem.setIcon(R.drawable.sort_dark);
 602                     } else {
 603                         menuItem.setIcon(R.drawable.sort_light);
 604                     }
 605
 606                     // Display a Snackbar indicating the current sort type.
 607                     Snackbar.make(bookmarksListView, R.string.sorted_by_database_id, Snackbar.LENGTH_SHORT).show();
 608                 }
 609
 610                 // Update the list view.
 611                 updateBookmarksListView();
 612                 break;
 613         }
 614         return true;
 615     }
 616
 617     @Override
 618     public void onBackPressed() {
 619         // Check to see if a snackbar is currently displayed.  If so, it must be closed before existing so that a pending delete is completed before reloading the list view in the bookmarks activity.
 620         if ((bookmarksDeletedSnackbar != null) && bookmarksDeletedSnackbar.isShown()) { // Close the bookmarks deleted snackbar before going home.
 621             // Set the close flag.
 622             closeActivityAfterDismissingSnackbar = true;
 623
 624             // Dismiss the snackbar.
 625             bookmarksDeletedSnackbar.dismiss();
 626         } else {  // Go home immediately.
 627             // Update the current folder in the bookmarks activity.
 628             switch (currentFolderDatabaseId) {
 629                 case ALL_FOLDERS_DATABASE_ID:
 630                     // Load the home folder.
 631                     BookmarksActivity.currentFolder = "";
 632                     break;
 633
 634                 case HOME_FOLDER_DATABASE_ID:
 635                     // Load the home folder.
 636                     BookmarksActivity.currentFolder = "";
 637                     break;
 638
 639                 default:
 640                     // Load the current folder.
 641                     BookmarksActivity.currentFolder = currentFolderName;
 642             }
 643
 644             // Reload the bookmarks list view when returning to the bookmarks activity.
 645             BookmarksActivity.restartFromBookmarksDatabaseViewActivity = true;
 646
 647             // Exit the bookmarks database view activity.
 648             super.onBackPressed();
 649         }
 650     }
 651
 652     private void updateBookmarksListView() {
 653         // Populate the bookmarks list view based on the spinner selection.
 654         switch (currentFolderDatabaseId) {
 655             // Get a cursor with all the folders.
 656             case ALL_FOLDERS_DATABASE_ID:
 657                 if (sortByDisplayOrder) {
 658                     bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksByDisplayOrder();
 659                 } else {
 660                     bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarks();
 661                 }
 662                 break;
 663
 664             // Get a cursor for the home folder.
 665             case HOME_FOLDER_DATABASE_ID:
 666                 if (sortByDisplayOrder) {
 667                     bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder("");
 668                 } else {
 669                     bookmarksCursor = bookmarksDatabaseHelper.getBookmarks("");
 670                 }
 671                 break;
 672
 673             // Display the selected folder.
 674             default:
 675                 // Get a cursor for the selected folder.
 676                 if (sortByDisplayOrder) {
 677                     bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolderName);
 678                 } else {
 679                     bookmarksCursor = bookmarksDatabaseHelper.getBookmarks(currentFolderName);
 680                 }
 681         }
 682
 683         // Update the list view.
 684         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 685     }
 686
 687     private void selectAllBookmarksInFolder(int folderId) {
 688         // Get a handle for the bookmarks list view.
 689         ListView bookmarksListView = findViewById(R.id.bookmarks_databaseview_listview);
 690
 691         // Get the folder name.
 692         String folderName = bookmarksDatabaseHelper.getFolderName(folderId);
 693
 694         // Get a cursor with the contents of the folder.
 695         Cursor folderCursor = bookmarksDatabaseHelper.getBookmarks(folderName);
 696
 697         // Move to the beginning of the cursor.
 698         folderCursor.moveToFirst();
 699
 700         while (folderCursor.getPosition() < folderCursor.getCount()) {
 701             // Get the bookmark database ID.
 702             int bookmarkId = folderCursor.getInt(folderCursor.getColumnIndex(BookmarksDatabaseHelper._ID));
 703
 704             // Move the bookmarks cursor to the first position.
 705             bookmarksCursor.moveToFirst();
 706
 707             // Initialize the bookmark position variable.
 708             int bookmarkPosition = -1;
 709
 710             // Get the position of this bookmark in the bookmarks cursor.
 711             while ((bookmarkPosition < 0) && (bookmarksCursor.getPosition() < bookmarksCursor.getCount())) {
 712                 // Check if the bookmark IDs match.
 713                 if (bookmarkId == bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper._ID))) {
 714                     // Get the bookmark position.
 715                     bookmarkPosition = bookmarksCursor.getPosition();
 716
 717                     // If this bookmark is a folder, select all the bookmarks inside it.
 718                     if (bookmarksDatabaseHelper.isFolder(bookmarkId)) {
 719                         selectAllBookmarksInFolder(bookmarkId);
 720                     }
 721
 722                     // Select the bookmark.
 723                     bookmarksListView.setItemChecked(bookmarkPosition, true);
 724                 }
 725
 726                 // Increment the bookmarks cursor position.
 727                 bookmarksCursor.moveToNext();
 728             }
 729
 730             // Move to the next position.
 731             folderCursor.moveToNext();
 732         }
 733     }
 734
 735     @Override
 736     public void onSaveBookmark(AppCompatDialogFragment dialogFragment, int selectedBookmarkDatabaseId) {
 737         // Get handles for the views from dialog fragment.
 738         RadioButton currentBookmarkIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_current_icon_radiobutton);
 739         EditText editBookmarkNameEditText = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_name_edittext);
 740         EditText editBookmarkUrlEditText = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_url_edittext);
 741         Spinner folderSpinner = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_folder_spinner);
 742         EditText displayOrderEditText = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_display_order_edittext);
 743
 744         // Extract the bookmark information.
 745         String bookmarkNameString = editBookmarkNameEditText.getText().toString();
 746         String bookmarkUrlString = editBookmarkUrlEditText.getText().toString();
 747         int folderDatabaseId = (int) folderSpinner.getSelectedItemId();
 748         int displayOrderInt = Integer.valueOf(displayOrderEditText.getText().toString());
 749
 750         // Instantiate the parent folder name `String`.
 751         String parentFolderNameString;
 752
 753         // Set the parent folder name.
 754         if (folderDatabaseId == EditBookmarkDatabaseViewDialog.HOME_FOLDER_DATABASE_ID) {  // The home folder is selected.  Use `""`.
 755             parentFolderNameString = "";
 756         } else {  // Get the parent folder name from the database.
 757             parentFolderNameString = bookmarksDatabaseHelper.getFolderName(folderDatabaseId);
 758         }
 759
 760         // Update the bookmark.
 761         if (currentBookmarkIconRadioButton.isChecked()) {  // Update the bookmark without changing the favorite icon.
 762             bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString, parentFolderNameString, displayOrderInt);
 763         } else {  // Update the bookmark using the `WebView` favorite icon.
 764             // Convert the favorite icon to a byte array.  `0` is for lossless compression (the only option for a PNG).
 765             ByteArrayOutputStream newFavoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
 766             MainWebViewActivity.favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFavoriteIconByteArrayOutputStream);
 767             byte[] newFavoriteIconByteArray = newFavoriteIconByteArrayOutputStream.toByteArray();
 768
 769             //  Update the bookmark and the favorite icon.
 770             bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString, parentFolderNameString, displayOrderInt, newFavoriteIconByteArray);
 771         }
 772
 773         // Update the list view.
 774         updateBookmarksListView();
 775     }
 776
 777     @Override
 778     public void onSaveBookmarkFolder(AppCompatDialogFragment dialogFragment, int selectedBookmarkDatabaseId) {
 779         // Get handles for the views from dialog fragment.
 780         RadioButton currentBookmarkIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_folder_current_icon_radiobutton);
 781         RadioButton defaultFolderIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon_radiobutton);
 782         ImageView defaultFolderIconImageView = dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon_imageview);
 783         EditText editBookmarkNameEditText = dialogFragment.getDialog().findViewById(R.id.edit_folder_name_edittext);
 784         Spinner parentFolderSpinner = dialogFragment.getDialog().findViewById(R.id.edit_folder_parent_folder_spinner);
 785         EditText displayOrderEditText = dialogFragment.getDialog().findViewById(R.id.edit_folder_display_order_edittext);
 786
 787         // Extract the folder information.
 788         String newFolderNameString = editBookmarkNameEditText.getText().toString();
 789         int parentFolderDatabaseId = (int) parentFolderSpinner.getSelectedItemId();
 790         int displayOrderInt = Integer.valueOf(displayOrderEditText.getText().toString());
 791
 792         // Instantiate the parent folder name `String`.
 793         String parentFolderNameString;
 794
 795         // Set the parent folder name.
 796         if (parentFolderDatabaseId == EditBookmarkFolderDatabaseViewDialog.HOME_FOLDER_DATABASE_ID) {  // The home folder is selected.  Use `""`.
 797             parentFolderNameString = "";
 798         } else {  // Get the parent folder name from the database.
 799             parentFolderNameString = bookmarksDatabaseHelper.getFolderName(parentFolderDatabaseId);
 800         }
 801
 802         // Update the folder.
 803         if (currentBookmarkIconRadioButton.isChecked()) {  // Update the folder without changing the favorite icon.
 804             bookmarksDatabaseHelper.updateFolder(selectedBookmarkDatabaseId, oldFolderNameString, newFolderNameString, parentFolderNameString, displayOrderInt);
 805         } else {  // Update the folder and the icon.
 806             // Instantiate the new folder icon `Bitmap`.
 807             Bitmap folderIconBitmap;
 808
 809             // Populate the new folder icon bitmap.
 810             if (defaultFolderIconRadioButton.isChecked()) {
 811                 // Get the default folder icon and convert it to a `Bitmap`.
 812                 Drawable folderIconDrawable = defaultFolderIconImageView.getDrawable();
 813                 BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 814                 folderIconBitmap = folderIconBitmapDrawable.getBitmap();
 815             } else {  // Use the `WebView` favorite icon.
 816                 folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 817             }
 818
 819             // Convert the folder icon to a byte array.  `0` is for lossless compression (the only option for a PNG).
 820             ByteArrayOutputStream newFolderIconByteArrayOutputStream = new ByteArrayOutputStream();
 821             folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFolderIconByteArrayOutputStream);
 822             byte[] newFolderIconByteArray = newFolderIconByteArrayOutputStream.toByteArray();
 823
 824             //  Update the folder and the icon.
 825             bookmarksDatabaseHelper.updateFolder(selectedBookmarkDatabaseId, oldFolderNameString, newFolderNameString, parentFolderNameString, displayOrderInt, newFolderIconByteArray);
 826         }
 827
 828         // Update the list view.
 829         updateBookmarksListView();
 830     }
 831
 832     @Override
 833     public void onDestroy() {
 834         // Close the bookmarks cursor and database.
 835         bookmarksCursor.close();
 836         bookmarksDatabaseHelper.close();
 837
 838         // Run the default commands.
 839         super.onDestroy();
 840     }
 841 }