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.annotation.SuppressLint;
  23 import android.content.Context;
  24 import android.database.Cursor;
  25 import android.database.MatrixCursor;
  26 import android.database.MergeCursor;
  27 import android.graphics.Bitmap;
  28 import android.graphics.BitmapFactory;
  29 import android.graphics.Typeface;
  30 import android.graphics.drawable.BitmapDrawable;
  31 import android.graphics.drawable.Drawable;
  32 import android.os.Bundle;
  33 import android.util.SparseBooleanArray;
  34 import android.view.ActionMode;
  35 import android.view.Menu;
  36 import android.view.MenuItem;
  37 import android.view.View;
  38 import android.view.ViewGroup;
  39 import android.view.WindowManager;
  40 import android.widget.AbsListView;
  41 import android.widget.AdapterView;
  42 import android.widget.EditText;
  43 import android.widget.ImageView;
  44 import android.widget.ListView;
  45 import android.widget.RadioButton;
  46 import android.widget.ResourceCursorAdapter;
  47 import android.widget.Spinner;
  48 import android.widget.TextView;
  49
  50 import androidx.appcompat.app.ActionBar;
  51 import androidx.appcompat.app.AppCompatActivity;
  52 import androidx.appcompat.widget.Toolbar;  // The AndroidX toolbar must be used until the minimum API is >= 21.
  53 import androidx.core.content.ContextCompat;
  54 import androidx.cursoradapter.widget.CursorAdapter;
  55 import androidx.fragment.app.DialogFragment;  // The AndroidX dialog fragment must be used or an error is produced on API <=22.
  56
  57 import com.google.android.material.snackbar.Snackbar;
  58
  59 import com.stoutner.privacybrowser.R;
  60 import com.stoutner.privacybrowser.dialogs.EditBookmarkDatabaseViewDialog;
  61 import com.stoutner.privacybrowser.dialogs.EditBookmarkFolderDatabaseViewDialog;
  62 import com.stoutner.privacybrowser.helpers.BookmarksDatabaseHelper;
  63
  64 import java.io.ByteArrayOutputStream;
  65 import java.util.Arrays;
  66
  67 public class BookmarksDatabaseViewActivity extends AppCompatActivity implements EditBookmarkDatabaseViewDialog.EditBookmarkDatabaseViewListener,
  68         EditBookmarkFolderDatabaseViewDialog.EditBookmarkFolderDatabaseViewListener {
  69     // Instantiate the constants.
  70     private static final int ALL_FOLDERS_DATABASE_ID = -2;
  71     private static final int HOME_FOLDER_DATABASE_ID = -1;
  72
  73     // `bookmarksDatabaseHelper` is used in `onCreate()`, `updateBookmarksListView()`, `selectAllBookmarksInFolder()`, and `onDestroy()`.
  74     private BookmarksDatabaseHelper bookmarksDatabaseHelper;
  75
  76     // `bookmarksCursor` is used in `onCreate()`, `updateBookmarksListView()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, and `onDestroy()`.
  77     private Cursor bookmarksCursor;
  78
  79     // `bookmarksCursorAdapter` is used in `onCreate()`, `selectAllBookmarksInFolder()`, and `updateBookmarksListView()`.
  80     private CursorAdapter bookmarksCursorAdapter;
  81
  82     // `oldFolderNameString` is used in `onCreate()` and `onSaveBookmarkFolder()`.
  83     private String oldFolderNameString;
  84
  85     // `currentFolderDatabaseId` is used in `onCreate()`, `updateBookmarksListView()`, `onSaveBookmark()`, and `onSaveBookmarkFolder()`.
  86     private int currentFolderDatabaseId;
  87
  88     // `currentFolder` is used in `onCreate()`, `onSaveBookmark()`, and `onSaveBookmarkFolder()`.
  89     private String currentFolderName;
  90
  91     // `sortByDisplayOrder` is used in `onCreate()`, `onOptionsItemSelected()`, and `updateBookmarksListView()`.
  92     private boolean sortByDisplayOrder;
  93
  94     // `bookmarksDeletedSnackbar` is used in `onCreate()`, `onOptionsItemSelected()`, and `onBackPressed()`.
  95     private Snackbar bookmarksDeletedSnackbar;
  96
  97     // `closeActivityAfterDismissingSnackbar` is used in `onCreate()`, `onOptionsItemSelected()`, and `onBackPressed()`.
  98     private boolean closeActivityAfterDismissingSnackbar;
  99
 100     @Override
 101     public void onCreate(Bundle savedInstanceState) {
 102         // Disable screenshots if not allowed.
 103         if (!MainWebViewActivity.allowScreenshots) {
 104             getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
 105         }
 106
 107         // Set the activity theme.
 108         if (MainWebViewActivity.darkTheme) {
 109             setTheme(R.style.PrivacyBrowserDark_SecondaryActivity);
 110         } else {
 111             setTheme(R.style.PrivacyBrowserLight_SecondaryActivity);
 112         }
 113
 114         // Run the default commands.
 115         super.onCreate(savedInstanceState);
 116
 117         // Set the content view.
 118         setContentView(R.layout.bookmarks_databaseview_coordinatorlayout);
 119
 120         // The AndroidX toolbar must be used until the minimum API is >= 21.
 121         Toolbar toolbar = findViewById(R.id.bookmarks_databaseview_toolbar);
 122         setSupportActionBar(toolbar);
 123
 124         // Get a handle for the `AppBar`.
 125         ActionBar actionBar = getSupportActionBar();
 126
 127         // Remove the incorrect lint warning that the action bar might be null.
 128         assert actionBar != null;
 129
 130         // Display the spinner and the back arrow in the action bar.
 131         actionBar.setCustomView(R.layout.spinner);
 132         actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM | ActionBar.DISPLAY_HOME_AS_UP);
 133
 134         // Initialize the database handler.  The `0` is to specify a database version, but that is set instead using a constant in `BookmarksDatabaseHelper`.
 135         bookmarksDatabaseHelper = new BookmarksDatabaseHelper(this, null, null, 0);
 136
 137         // Setup a matrix cursor for "All Folders" and "Home Folder".
 138         String[] matrixCursorColumnNames = {BookmarksDatabaseHelper._ID, BookmarksDatabaseHelper.BOOKMARK_NAME};
 139         MatrixCursor matrixCursor = new MatrixCursor(matrixCursorColumnNames);
 140         matrixCursor.addRow(new Object[]{ALL_FOLDERS_DATABASE_ID, getString(R.string.all_folders)});
 141         matrixCursor.addRow(new Object[]{HOME_FOLDER_DATABASE_ID, getString(R.string.home_folder)});
 142
 143         // Get a cursor with the list of all the folders.
 144         Cursor foldersCursor = bookmarksDatabaseHelper.getAllFolders();
 145
 146         // Combine `matrixCursor` and `foldersCursor`.
 147         MergeCursor foldersMergeCursor = new MergeCursor(new Cursor[]{matrixCursor, foldersCursor});
 148
 149
 150         // Get the default folder bitmap.  `ContextCompat` must be used until the minimum API >= 21.
 151         Drawable defaultFolderDrawable = ContextCompat.getDrawable(getApplicationContext(), R.drawable.folder_blue_bitmap);
 152
 153         // Cast the default folder drawable to a `BitmapDrawable`.
 154         BitmapDrawable defaultFolderBitmapDrawable = (BitmapDrawable) defaultFolderDrawable;
 155
 156         // Remove the incorrect lint warning that `.getBitmap()` might be null.
 157         assert defaultFolderBitmapDrawable != null;
 158
 159         // Convert the default folder `BitmapDrawable` to a bitmap.
 160         Bitmap defaultFolderBitmap = defaultFolderBitmapDrawable.getBitmap();
 161
 162
 163         // Create a resource cursor adapter for the spinner.
 164         ResourceCursorAdapter foldersCursorAdapter = new ResourceCursorAdapter(this, R.layout.appbar_spinner_item, foldersMergeCursor, 0) {
 165             @Override
 166             public void bindView(View view, Context context, Cursor cursor) {
 167                 // Get handles for the spinner views.
 168                 ImageView spinnerItemImageView = view.findViewById(R.id.spinner_item_imageview);
 169                 TextView spinnerItemTextView = view.findViewById(R.id.spinner_item_textview);
 170
 171                 // Set the folder icon according to the type.
 172                 if (foldersMergeCursor.getPosition() > 1) {  // Set a user folder icon.
 173                     // Initialize a default folder icon byte array output stream.
 174                     ByteArrayOutputStream defaultFolderIconByteArrayOutputStream = new ByteArrayOutputStream();
 175
 176                     // 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).
 177                     defaultFolderBitmap.compress(Bitmap.CompressFormat.PNG, 0, defaultFolderIconByteArrayOutputStream);
 178
 179                     // Convert the default folder icon output stream to a byte array.
 180                     byte[] defaultFolderIconByteArray = defaultFolderIconByteArrayOutputStream.toByteArray();
 181
 182
 183                     // Get the folder icon byte array from the cursor.
 184                     byte[] folderIconByteArray = cursor.getBlob(cursor.getColumnIndex(BookmarksDatabaseHelper.FAVORITE_ICON));
 185
 186                     // Convert the byte array to a bitmap beginning at the first byte and ending at the last.
 187                     Bitmap folderIconBitmap = BitmapFactory.decodeByteArray(folderIconByteArray, 0, folderIconByteArray.length);
 188
 189
 190                     // Set the icon according to the type.
 191                     if (Arrays.equals(folderIconByteArray, defaultFolderIconByteArray)) {  // The default folder icon is used.
 192                         // Set a smaller and darker folder icon, which works well with the spinner.
 193                         spinnerItemImageView.setImageDrawable(ContextCompat.getDrawable(context, R.drawable.folder_dark_blue));
 194                     } else {  // A custom folder icon is uses.
 195                         // Set the folder image stored in the cursor.
 196                         spinnerItemImageView.setImageBitmap(folderIconBitmap);
 197                     }
 198                 } else {  // Set the `All Folders` or `Home Folder` icon.
 199                     // Set the gray folder image.  `ContextCompat` must be used until the minimum API >= 21.
 200                     spinnerItemImageView.setImageDrawable(ContextCompat.getDrawable(context, R.drawable.folder_gray));
 201                 }
 202
 203                 // Set the text view to display the folder name.
 204                 spinnerItemTextView.setText(cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME)));
 205             }
 206         };
 207
 208         // Set the resource cursor adapter drop drown view resource.
 209         foldersCursorAdapter.setDropDownViewResource(R.layout.appbar_spinner_dropdown_item);
 210
 211         // Get a handle for the folder spinner and set the adapter.
 212         Spinner folderSpinner = findViewById(R.id.spinner);
 213         folderSpinner.setAdapter(foldersCursorAdapter);
 214
 215         // Handle taps on the spinner dropdown.
 216         folderSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
 217             @Override
 218             public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
 219                 // Store the current folder database ID.
 220                 currentFolderDatabaseId = (int) id;
 221
 222                 // Get a handle for the selected view.
 223                 TextView selectedFolderTextView = findViewById(R.id.spinner_item_textview);
 224
 225                 // Store the current folder name.
 226                 currentFolderName = selectedFolderTextView.getText().toString();
 227
 228                 // Update the list view.
 229                 updateBookmarksListView();
 230             }
 231
 232             @Override
 233             public void onNothingSelected(AdapterView<?> parent) {
 234                 // Do nothing.
 235             }
 236         });
 237
 238         // Get a handle for the bookmarks `ListView`.
 239         ListView bookmarksListView = findViewById(R.id.bookmarks_databaseview_listview);
 240
 241         // Get a `Cursor` with the current contents of the bookmarks database.
 242         bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarks();
 243
 244         // Setup a `CursorAdapter` with `this` context.  `false` disables autoRequery.
 245         bookmarksCursorAdapter = new CursorAdapter(this, bookmarksCursor, false) {
 246             @Override
 247             public View newView(Context context, Cursor cursor, ViewGroup parent) {
 248                 // Inflate the individual item layout.  `false` does not attach it to the root.
 249                 return getLayoutInflater().inflate(R.layout.bookmarks_databaseview_item_linearlayout, parent, false);
 250             }
 251
 252             @Override
 253             public void bindView(View view, Context context, Cursor cursor) {
 254                 boolean isFolder = (cursor.getInt(cursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1);
 255
 256                 // Get the database ID from the `Cursor` and display it in `bookmarkDatabaseIdTextView`.
 257                 int bookmarkDatabaseId = cursor.getInt(cursor.getColumnIndex(BookmarksDatabaseHelper._ID));
 258                 TextView bookmarkDatabaseIdTextView = view.findViewById(R.id.bookmarks_databaseview_database_id);
 259                 bookmarkDatabaseIdTextView.setText(String.valueOf(bookmarkDatabaseId));
 260
 261                 // Get the favorite icon byte array from the `Cursor`.
 262                 byte[] favoriteIconByteArray = cursor.getBlob(cursor.getColumnIndex(BookmarksDatabaseHelper.FAVORITE_ICON));
 263                 // Convert the byte array to a `Bitmap` beginning at the beginning at the first byte and ending at the last.
 264                 Bitmap favoriteIconBitmap = BitmapFactory.decodeByteArray(favoriteIconByteArray, 0, favoriteIconByteArray.length);
 265                 // Display the bitmap in `bookmarkFavoriteIcon`.
 266                 ImageView bookmarkFavoriteIcon = view.findViewById(R.id.bookmarks_databaseview_favorite_icon);
 267                 bookmarkFavoriteIcon.setImageBitmap(favoriteIconBitmap);
 268
 269                 // Get the bookmark name from the `Cursor` and display it in `bookmarkNameTextView`.
 270                 String bookmarkNameString = cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 271                 TextView bookmarkNameTextView = view.findViewById(R.id.bookmarks_databaseview_bookmark_name);
 272                 bookmarkNameTextView.setText(bookmarkNameString);
 273
 274                 // Make the font bold for folders.
 275                 if (isFolder) {
 276                     // The first argument is `null` prevent changing of the font.
 277                     bookmarkNameTextView.setTypeface(null, Typeface.BOLD);
 278                 } else {  // Reset the font to default.
 279                     bookmarkNameTextView.setTypeface(Typeface.DEFAULT);
 280                 }
 281
 282                 // Get the bookmark URL form the `Cursor` and display it in `bookmarkUrlTextView`.
 283                 String bookmarkUrlString = cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_URL));
 284                 TextView bookmarkUrlTextView = view.findViewById(R.id.bookmarks_databaseview_bookmark_url);
 285                 bookmarkUrlTextView.setText(bookmarkUrlString);
 286
 287                 // Hide the URL if the bookmark is a folder.
 288                 if (isFolder) {
 289                     bookmarkUrlTextView.setVisibility(View.GONE);
 290                 } else {
 291                     bookmarkUrlTextView.setVisibility(View.VISIBLE);
 292                 }
 293
 294                 // Get the display order from the `Cursor` and display it in `bookmarkDisplayOrderTextView`.
 295                 int bookmarkDisplayOrder = cursor.getInt(cursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER));
 296                 TextView bookmarkDisplayOrderTextView = view.findViewById(R.id.bookmarks_databaseview_display_order);
 297                 bookmarkDisplayOrderTextView.setText(String.valueOf(bookmarkDisplayOrder));
 298
 299                 // Get the parent folder from the `Cursor` and display it in `bookmarkParentFolder`.
 300                 String bookmarkParentFolder = cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.PARENT_FOLDER));
 301                 ImageView parentFolderImageView = view.findViewById(R.id.bookmarks_databaseview_parent_folder_icon);
 302                 TextView bookmarkParentFolderTextView = view.findViewById(R.id.bookmarks_databaseview_parent_folder);
 303
 304                 // Make the folder name gray if it is the home folder.
 305                 if (bookmarkParentFolder.isEmpty()) {
 306                     parentFolderImageView.setImageDrawable(ContextCompat.getDrawable(getApplicationContext(), R.drawable.folder_gray));
 307                     bookmarkParentFolderTextView.setText(R.string.home_folder);
 308                     bookmarkParentFolderTextView.setTextColor(ContextCompat.getColor(getApplicationContext(), R.color.gray_500));
 309                 } else {
 310                     parentFolderImageView.setImageDrawable(ContextCompat.getDrawable(getApplicationContext(), R.drawable.folder_dark_blue));
 311                     bookmarkParentFolderTextView.setText(bookmarkParentFolder);
 312
 313                     // Set the text color according to the theme.
 314                     if (MainWebViewActivity.darkTheme) {
 315                         bookmarkParentFolderTextView.setTextColor(ContextCompat.getColor(getApplicationContext(), R.color.gray_300));
 316                     } else {
 317                         bookmarkParentFolderTextView.setTextColor(ContextCompat.getColor(getApplicationContext(), R.color.black));
 318                     }
 319                 }
 320             }
 321         };
 322
 323         // Update the ListView.
 324         bookmarksListView.setAdapter(bookmarksCursorAdapter);
 325
 326         // Set the current folder database ID.
 327         currentFolderDatabaseId = ALL_FOLDERS_DATABASE_ID;
 328
 329         // Set a listener to edit a bookmark when it is tapped.
 330         bookmarksListView.setOnItemClickListener((AdapterView<?> parent, View view, int position, long id) -> {
 331             // Convert the database ID to an int.
 332             int databaseId = (int) id;
 333
 334             // Show the edit bookmark or edit bookmark folder dialog.
 335             if (bookmarksDatabaseHelper.isFolder(databaseId)) {
 336                 // Save the current folder name, which is used in `onSaveBookmarkFolder()`.
 337                 oldFolderNameString = bookmarksCursor.getString(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 338
 339                 // Show the edit bookmark folder dialog.
 340                 DialogFragment editBookmarkFolderDatabaseViewDialog = EditBookmarkFolderDatabaseViewDialog.folderDatabaseId(databaseId);
 341                 editBookmarkFolderDatabaseViewDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_folder));
 342             } else {
 343                 // Show the edit bookmark dialog.
 344                 DialogFragment editBookmarkDatabaseViewDialog = EditBookmarkDatabaseViewDialog.bookmarkDatabaseId(databaseId);
 345                 editBookmarkDatabaseViewDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_bookmark));
 346             }
 347         });
 348
 349         // Handle long presses on the list view.
 350         bookmarksListView.setMultiChoiceModeListener(new AbsListView.MultiChoiceModeListener() {
 351             // Instantiate the common variables.
 352             MenuItem selectAllMenuItem;
 353             MenuItem deleteMenuItem;
 354             boolean deletingBookmarks;
 355
 356             @Override
 357             public boolean onCreateActionMode(ActionMode mode, Menu menu) {
 358                 // Inflate the menu for the contextual app bar.
 359                 getMenuInflater().inflate(R.menu.bookmarks_databaseview_context_menu, menu);
 360
 361                 // Set the title.
 362                 mode.setTitle(R.string.bookmarks);
 363
 364                 // Get handles for the menu items.
 365                 selectAllMenuItem = menu.findItem(R.id.select_all);
 366                 deleteMenuItem = menu.findItem(R.id.delete);
 367
 368                 // Disable the delete menu item if a delete is pending.
 369                 deleteMenuItem.setEnabled(!deletingBookmarks);
 370
 371                 // Make it so.
 372                 return true;
 373             }
 374
 375             @Override
 376             public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
 377                 // Do nothing.
 378                 return false;
 379             }
 380
 381             @Override
 382             public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
 383                 // Calculate the number of selected bookmarks.
 384                 int numberOfSelectedBookmarks = bookmarksListView.getCheckedItemCount();
 385
 386                 // Adjust the ActionMode according to the number of selected bookmarks.
 387                 mode.setSubtitle(getString(R.string.selected) + "  " + numberOfSelectedBookmarks);
 388
 389                 // Do not show the select all menu item if all the bookmarks are already checked.
 390                 if (bookmarksListView.getCheckedItemCount() == bookmarksListView.getCount()) {
 391                     selectAllMenuItem.setVisible(false);
 392                 } else {
 393                     selectAllMenuItem.setVisible(true);
 394                 }
 395
 396                 // Convert the database ID to an int.
 397                 int databaseId = (int) id;
 398
 399                 // If a folder was selected, also select all the contents.
 400                 if (checked && bookmarksDatabaseHelper.isFolder(databaseId)) {
 401                     selectAllBookmarksInFolder(databaseId);
 402                 }
 403
 404                 // Do not allow a bookmark to be deselected if the folder is selected.
 405                 if (!checked) {
 406                     // Get the folder name.
 407                     String folderName = bookmarksDatabaseHelper.getParentFolderName((int) id);
 408
 409                     // If the bookmark is not in the root folder, check to see if the folder is selected.
 410                     if (!folderName.isEmpty()) {
 411                         // Get the database ID of the folder.
 412                         int folderDatabaseId = bookmarksDatabaseHelper.getFolderDatabaseId(folderName);
 413
 414                         // Move the bookmarks cursor to the first position.
 415                         bookmarksCursor.moveToFirst();
 416
 417                         // Initialize the folder position variable.
 418                         int folderPosition = -1;
 419
 420                         // Get the position of the folder in the bookmarks cursor.
 421                         while ((folderPosition < 0) && (bookmarksCursor.getPosition() < bookmarksCursor.getCount())) {
 422                             // Check if the folder database ID matches the bookmark database ID.
 423                             if (folderDatabaseId == bookmarksCursor.getInt((bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper._ID)))) {
 424                                 // Get the folder position.
 425                                 folderPosition = bookmarksCursor.getPosition();
 426
 427                                 // Check if the folder is selected.
 428                                 if (bookmarksListView.isItemChecked(folderPosition)) {
 429                                     // Reselect the bookmark.
 430                                     bookmarksListView.setItemChecked(position, true);
 431
 432                                     // Display a snackbar explaining why the bookmark cannot be deselected.
 433                                     Snackbar.make(bookmarksListView, R.string.cannot_deselect_bookmark, Snackbar.LENGTH_LONG).show();
 434                                 }
 435                             }
 436
 437                             // Increment the bookmarks cursor.
 438                             bookmarksCursor.moveToNext();
 439                         }
 440                     }
 441                 }
 442             }
 443
 444             @Override
 445             public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
 446                 switch (item.getItemId()) {
 447                     case R.id.select_all:
 448                         // Get the total number of bookmarks.
 449                         int numberOfBookmarks = bookmarksListView.getCount();
 450
 451                         // Select them all.
 452                         for (int i = 0; i < numberOfBookmarks; i++) {
 453                             bookmarksListView.setItemChecked(i, true);
 454                         }
 455                         break;
 456
 457                     case R.id.delete:
 458                         // Set the deleting bookmarks flag, which prevents the delete menu item from being enabled until the current process finishes.
 459                         deletingBookmarks = true;
 460
 461                         // Get an array of the selected row IDs.
 462                         long[] selectedBookmarksIdsLongArray = bookmarksListView.getCheckedItemIds();
 463
 464                         // 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.
 465                         SparseBooleanArray selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions().clone();
 466
 467                         // Update the bookmarks cursor with the current contents of the bookmarks database except for the specified database IDs.
 468                         switch (currentFolderDatabaseId) {
 469                             // Get a cursor with all the folders.
 470                             case ALL_FOLDERS_DATABASE_ID:
 471                                 if (sortByDisplayOrder) {
 472                                     bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksByDisplayOrderExcept(selectedBookmarksIdsLongArray);
 473                                 } else {
 474                                     bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksExcept(selectedBookmarksIdsLongArray);
 475                                 }
 476                                 break;
 477
 478                             // Get a cursor for the home folder.
 479                             case HOME_FOLDER_DATABASE_ID:
 480                                 if (sortByDisplayOrder) {
 481                                     bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrderExcept(selectedBookmarksIdsLongArray, "");
 482                                 } else {
 483                                     bookmarksCursor = bookmarksDatabaseHelper.getBookmarksExcept(selectedBookmarksIdsLongArray, "");
 484                                 }
 485                                 break;
 486
 487                             // Display the selected folder.
 488                             default:
 489                                 // Get a cursor for the selected folder.
 490                                 if (sortByDisplayOrder) {
 491                                     bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrderExcept(selectedBookmarksIdsLongArray, currentFolderName);
 492                                 } else {
 493                                     bookmarksCursor = bookmarksDatabaseHelper.getBookmarksExcept(selectedBookmarksIdsLongArray, currentFolderName);
 494                                 }
 495                         }
 496
 497                         // Update the list view.
 498                         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 499
 500                         // Show a Snackbar with the number of deleted bookmarks.
 501                         bookmarksDeletedSnackbar = Snackbar.make(findViewById(R.id.bookmarks_databaseview_coordinatorlayout),
 502                                 getString(R.string.bookmarks_deleted) + "  " + selectedBookmarksIdsLongArray.length, Snackbar.LENGTH_LONG)
 503                                 .setAction(R.string.undo, view -> {
 504                                     // Do nothing because everything will be handled by `onDismissed()` below.
 505                                 })
 506                                 .addCallback(new Snackbar.Callback() {
 507                                     @SuppressLint("SwitchIntDef")  // Ignore the lint warning about not handling the other possible events as they are covered by `default:`.
 508                                     @Override
 509                                     public void onDismissed(Snackbar snackbar, int event) {
 510                                         switch (event) {
 511                                             // The user pushed the `Undo` button.
 512                                             case Snackbar.Callback.DISMISS_EVENT_ACTION:
 513                                                 // Update the bookmarks list view with the current contents of the bookmarks database, including the "deleted bookmarks.
 514                                                 updateBookmarksListView();
 515
 516                                                 // Re-select the previously selected bookmarks.
 517                                                 for (int i = 0; i < selectedBookmarksPositionsSparseBooleanArray.size(); i++) {
 518                                                     bookmarksListView.setItemChecked(selectedBookmarksPositionsSparseBooleanArray.keyAt(i), true);
 519                                                 }
 520                                                 break;
 521
 522                                                 // The Snackbar was dismissed without the `Undo` button being pushed.
 523                                             default:
 524                                                 // Delete each selected bookmark.
 525                                                 for (long databaseIdLong : selectedBookmarksIdsLongArray) {
 526                                                     // Convert `databaseIdLong` to an int.
 527                                                     int databaseIdInt = (int) databaseIdLong;
 528
 529                                                     // Delete the selected bookmark.
 530                                                     bookmarksDatabaseHelper.deleteBookmark(databaseIdInt);
 531                                                 }
 532                                         }
 533
 534                                         // Reset the deleting bookmarks flag.
 535                                         deletingBookmarks = false;
 536
 537                                         // Enable the delete menu item.
 538                                         deleteMenuItem.setEnabled(true);
 539
 540                                         // Close the activity if back has been pressed.
 541                                         if (closeActivityAfterDismissingSnackbar) {
 542                                             onBackPressed();
 543                                         }
 544                                     }
 545                                 });
 546
 547                         // Show the Snackbar.
 548                         bookmarksDeletedSnackbar.show();
 549                         break;
 550                 }
 551
 552                 // Consume the click.
 553                 return false;
 554             }
 555
 556             @Override
 557             public void onDestroyActionMode(ActionMode mode) {
 558                 // Do nothing.
 559             }
 560         });
 561     }
 562
 563     @Override
 564     public boolean onCreateOptionsMenu(Menu menu) {
 565         // Inflate the menu.
 566         getMenuInflater().inflate(R.menu.bookmarks_databaseview_options_menu, menu);
 567
 568         // Success.
 569         return true;
 570     }
 571
 572     @Override
 573     public boolean onOptionsItemSelected(MenuItem menuItem) {
 574         // Get the ID of the menu item that was selected.
 575         int menuItemId = menuItem.getItemId();
 576
 577         switch (menuItemId) {
 578             case android.R.id.home:  // The home arrow is identified as `android.R.id.home`, not just `R.id.home`.
 579                 // Exit the activity.
 580                 onBackPressed();
 581                 break;
 582
 583             case R.id.options_menu_sort:
 584                 // Update the sort by display order tracker.
 585                 sortByDisplayOrder = !sortByDisplayOrder;
 586
 587                 // Get a handle for the bookmarks `ListView`.
 588                 ListView bookmarksListView = findViewById(R.id.bookmarks_databaseview_listview);
 589
 590                 // Update the icon and display a snackbar.
 591                 if (sortByDisplayOrder) {  // Sort by display order.
 592                     // Update the icon according to the theme.
 593                     if (MainWebViewActivity.darkTheme) {
 594                         menuItem.setIcon(R.drawable.sort_selected_dark);
 595                     } else {
 596                         menuItem.setIcon(R.drawable.sort_selected_light);
 597                     }
 598
 599                     // Display a Snackbar indicating the current sort type.
 600                     Snackbar.make(bookmarksListView, R.string.sorted_by_display_order, Snackbar.LENGTH_SHORT).show();
 601                 } else {  // Sort by database id.
 602                     // Update the icon according to the theme.
 603                     if (MainWebViewActivity.darkTheme) {
 604                         menuItem.setIcon(R.drawable.sort_dark);
 605                     } else {
 606                         menuItem.setIcon(R.drawable.sort_light);
 607                     }
 608
 609                     // Display a Snackbar indicating the current sort type.
 610                     Snackbar.make(bookmarksListView, R.string.sorted_by_database_id, Snackbar.LENGTH_SHORT).show();
 611                 }
 612
 613                 // Update the list view.
 614                 updateBookmarksListView();
 615                 break;
 616         }
 617         return true;
 618     }
 619
 620     @Override
 621     public void onBackPressed() {
 622         // 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.
 623         if ((bookmarksDeletedSnackbar != null) && bookmarksDeletedSnackbar.isShown()) { // Close the bookmarks deleted snackbar before going home.
 624             // Set the close flag.
 625             closeActivityAfterDismissingSnackbar = true;
 626
 627             // Dismiss the snackbar.
 628             bookmarksDeletedSnackbar.dismiss();
 629         } else {  // Go home immediately.
 630             // Update the current folder in the bookmarks activity.
 631             switch (currentFolderDatabaseId) {
 632                 case ALL_FOLDERS_DATABASE_ID:
 633                     // Load the home folder.
 634                     BookmarksActivity.currentFolder = "";
 635                     break;
 636
 637                 case HOME_FOLDER_DATABASE_ID:
 638                     // Load the home folder.
 639                     BookmarksActivity.currentFolder = "";
 640                     break;
 641
 642                 default:
 643                     // Load the current folder.
 644                     BookmarksActivity.currentFolder = currentFolderName;
 645             }
 646
 647             // Reload the bookmarks list view when returning to the bookmarks activity.
 648             BookmarksActivity.restartFromBookmarksDatabaseViewActivity = true;
 649
 650             // Exit the bookmarks database view activity.
 651             super.onBackPressed();
 652         }
 653     }
 654
 655     private void updateBookmarksListView() {
 656         // Populate the bookmarks list view based on the spinner selection.
 657         switch (currentFolderDatabaseId) {
 658             // Get a cursor with all the folders.
 659             case ALL_FOLDERS_DATABASE_ID:
 660                 if (sortByDisplayOrder) {
 661                     bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksByDisplayOrder();
 662                 } else {
 663                     bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarks();
 664                 }
 665                 break;
 666
 667             // Get a cursor for the home folder.
 668             case HOME_FOLDER_DATABASE_ID:
 669                 if (sortByDisplayOrder) {
 670                     bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder("");
 671                 } else {
 672                     bookmarksCursor = bookmarksDatabaseHelper.getBookmarks("");
 673                 }
 674                 break;
 675
 676             // Display the selected folder.
 677             default:
 678                 // Get a cursor for the selected folder.
 679                 if (sortByDisplayOrder) {
 680                     bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolderName);
 681                 } else {
 682                     bookmarksCursor = bookmarksDatabaseHelper.getBookmarks(currentFolderName);
 683                 }
 684         }
 685
 686         // Update the list view.
 687         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 688     }
 689
 690     private void selectAllBookmarksInFolder(int folderId) {
 691         // Get a handle for the bookmarks list view.
 692         ListView bookmarksListView = findViewById(R.id.bookmarks_databaseview_listview);
 693
 694         // Get the folder name.
 695         String folderName = bookmarksDatabaseHelper.getFolderName(folderId);
 696
 697         // Get a cursor with the contents of the folder.
 698         Cursor folderCursor = bookmarksDatabaseHelper.getBookmarks(folderName);
 699
 700         // Move to the beginning of the cursor.
 701         folderCursor.moveToFirst();
 702
 703         while (folderCursor.getPosition() < folderCursor.getCount()) {
 704             // Get the bookmark database ID.
 705             int bookmarkId = folderCursor.getInt(folderCursor.getColumnIndex(BookmarksDatabaseHelper._ID));
 706
 707             // Move the bookmarks cursor to the first position.
 708             bookmarksCursor.moveToFirst();
 709
 710             // Initialize the bookmark position variable.
 711             int bookmarkPosition = -1;
 712
 713             // Get the position of this bookmark in the bookmarks cursor.
 714             while ((bookmarkPosition < 0) && (bookmarksCursor.getPosition() < bookmarksCursor.getCount())) {
 715                 // Check if the bookmark IDs match.
 716                 if (bookmarkId == bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper._ID))) {
 717                     // Get the bookmark position.
 718                     bookmarkPosition = bookmarksCursor.getPosition();
 719
 720                     // If this bookmark is a folder, select all the bookmarks inside it.
 721                     if (bookmarksDatabaseHelper.isFolder(bookmarkId)) {
 722                         selectAllBookmarksInFolder(bookmarkId);
 723                     }
 724
 725                     // Select the bookmark.
 726                     bookmarksListView.setItemChecked(bookmarkPosition, true);
 727                 }
 728
 729                 // Increment the bookmarks cursor position.
 730                 bookmarksCursor.moveToNext();
 731             }
 732
 733             // Move to the next position.
 734             folderCursor.moveToNext();
 735         }
 736     }
 737
 738     @Override
 739     public void onSaveBookmark(DialogFragment dialogFragment, int selectedBookmarkDatabaseId) {
 740         // Get handles for the views from dialog fragment.
 741         RadioButton currentBookmarkIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_current_icon_radiobutton);
 742         EditText editBookmarkNameEditText = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_name_edittext);
 743         EditText editBookmarkUrlEditText = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_url_edittext);
 744         Spinner folderSpinner = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_folder_spinner);
 745         EditText displayOrderEditText = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_display_order_edittext);
 746
 747         // Extract the bookmark information.
 748         String bookmarkNameString = editBookmarkNameEditText.getText().toString();
 749         String bookmarkUrlString = editBookmarkUrlEditText.getText().toString();
 750         int folderDatabaseId = (int) folderSpinner.getSelectedItemId();
 751         int displayOrderInt = Integer.valueOf(displayOrderEditText.getText().toString());
 752
 753         // Instantiate the parent folder name `String`.
 754         String parentFolderNameString;
 755
 756         // Set the parent folder name.
 757         if (folderDatabaseId == EditBookmarkDatabaseViewDialog.HOME_FOLDER_DATABASE_ID) {  // The home folder is selected.  Use `""`.
 758             parentFolderNameString = "";
 759         } else {  // Get the parent folder name from the database.
 760             parentFolderNameString = bookmarksDatabaseHelper.getFolderName(folderDatabaseId);
 761         }
 762
 763         // Update the bookmark.
 764         if (currentBookmarkIconRadioButton.isChecked()) {  // Update the bookmark without changing the favorite icon.
 765             bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString, parentFolderNameString, displayOrderInt);
 766         } else {  // Update the bookmark using the `WebView` favorite icon.
 767             // Get a copy of the favorite icon bitmap.
 768             Bitmap favoriteIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 769
 770             // Scale the favorite icon bitmap down if it is larger than 256 x 256.  Filtering uses bilinear interpolation.
 771             if ((favoriteIconBitmap.getHeight() > 256) || (favoriteIconBitmap.getWidth() > 256)) {
 772                 favoriteIconBitmap = Bitmap.createScaledBitmap(favoriteIconBitmap, 256, 256, true);
 773             }
 774
 775             // Create a favorite icon byte array output stream.
 776             ByteArrayOutputStream newFavoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
 777
 778             // Convert the favorite icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
 779             favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFavoriteIconByteArrayOutputStream);
 780
 781             // Convert the favorite icon byte array stream to a byte array.
 782             byte[] newFavoriteIconByteArray = newFavoriteIconByteArrayOutputStream.toByteArray();
 783
 784             //  Update the bookmark and the favorite icon.
 785             bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString, parentFolderNameString, displayOrderInt, newFavoriteIconByteArray);
 786         }
 787
 788         // Update the list view.
 789         updateBookmarksListView();
 790     }
 791
 792     @Override
 793     public void onSaveBookmarkFolder(DialogFragment dialogFragment, int selectedBookmarkDatabaseId) {
 794         // Get handles for the views from dialog fragment.
 795         RadioButton currentBookmarkIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_folder_current_icon_radiobutton);
 796         RadioButton defaultFolderIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon_radiobutton);
 797         ImageView defaultFolderIconImageView = dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon_imageview);
 798         EditText editBookmarkNameEditText = dialogFragment.getDialog().findViewById(R.id.edit_folder_name_edittext);
 799         Spinner parentFolderSpinner = dialogFragment.getDialog().findViewById(R.id.edit_folder_parent_folder_spinner);
 800         EditText displayOrderEditText = dialogFragment.getDialog().findViewById(R.id.edit_folder_display_order_edittext);
 801
 802         // Extract the folder information.
 803         String newFolderNameString = editBookmarkNameEditText.getText().toString();
 804         int parentFolderDatabaseId = (int) parentFolderSpinner.getSelectedItemId();
 805         int displayOrderInt = Integer.valueOf(displayOrderEditText.getText().toString());
 806
 807         // Instantiate the parent folder name `String`.
 808         String parentFolderNameString;
 809
 810         // Set the parent folder name.
 811         if (parentFolderDatabaseId == EditBookmarkFolderDatabaseViewDialog.HOME_FOLDER_DATABASE_ID) {  // The home folder is selected.  Use `""`.
 812             parentFolderNameString = "";
 813         } else {  // Get the parent folder name from the database.
 814             parentFolderNameString = bookmarksDatabaseHelper.getFolderName(parentFolderDatabaseId);
 815         }
 816
 817         // Update the folder.
 818         if (currentBookmarkIconRadioButton.isChecked()) {  // Update the folder without changing the favorite icon.
 819             bookmarksDatabaseHelper.updateFolder(selectedBookmarkDatabaseId, oldFolderNameString, newFolderNameString, parentFolderNameString, displayOrderInt);
 820         } else {  // Update the folder and the icon.
 821             // Create the new folder icon Bitmap.
 822             Bitmap folderIconBitmap;
 823
 824             // Populate the new folder icon bitmap.
 825             if (defaultFolderIconRadioButton.isChecked()) {
 826                 // Get the default folder icon drawable.
 827                 Drawable folderIconDrawable = defaultFolderIconImageView.getDrawable();
 828
 829                 // Convert the folder icon drawable to a bitmap drawable.
 830                 BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 831
 832                 // Convert the folder icon bitmap drawable to a bitmap.
 833                 folderIconBitmap = folderIconBitmapDrawable.getBitmap();
 834             } else {  // Use the `WebView` favorite icon.
 835                 // Get a copy of the favorite icon bitmap.
 836                 folderIconBitmap = MainWebViewActivity.favoriteIconBitmap;
 837
 838                 // Scale the folder icon bitmap down if it is larger than 256 x 256.  Filtering uses bilinear interpolation.
 839                 if ((folderIconBitmap.getHeight() > 256) || (folderIconBitmap.getWidth() > 256)) {
 840                     folderIconBitmap = Bitmap.createScaledBitmap(folderIconBitmap, 256, 256, true);
 841                 }
 842             }
 843
 844             // Create a folder icon byte array output stream.
 845             ByteArrayOutputStream newFolderIconByteArrayOutputStream = new ByteArrayOutputStream();
 846
 847             // Convert the folder icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
 848             folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFolderIconByteArrayOutputStream);
 849
 850             // Convert the folder icon byte array stream to a byte array.
 851             byte[] newFolderIconByteArray = newFolderIconByteArrayOutputStream.toByteArray();
 852
 853             //  Update the folder and the icon.
 854             bookmarksDatabaseHelper.updateFolder(selectedBookmarkDatabaseId, oldFolderNameString, newFolderNameString, parentFolderNameString, displayOrderInt, newFolderIconByteArray);
 855         }
 856
 857         // Update the list view.
 858         updateBookmarksListView();
 859     }
 860
 861     @Override
 862     public void onDestroy() {
 863         // Close the bookmarks cursor and database.
 864         bookmarksCursor.close();
 865         bookmarksDatabaseHelper.close();
 866
 867         // Run the default commands.
 868         super.onDestroy();
 869     }
 870 }