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