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