Fix a crash when uploading files to some sites. https://redmine.stoutner.com/issues/556
[PrivacyBrowser.git] / app / src / main / java / com / stoutner / privacybrowser / activities / BookmarksDatabaseViewActivity.java
index 323c10999714e79e06de6234ec678939e1d7ba7a..61b5e84582278088be4674358fba1298dd02c962 100644 (file)
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Soren Stoutner <soren@stoutner.com>.
+ * Copyright © 2016-2020 Soren Stoutner <soren@stoutner.com>.
  *
  * This file is part of Privacy Browser <https://www.stoutner.com/privacy-browser>.
  *
 
 package com.stoutner.privacybrowser.activities;
 
+import android.annotation.SuppressLint;
+import android.app.Dialog;
 import android.content.Context;
+import android.content.Intent;
+import android.content.SharedPreferences;
 import android.database.Cursor;
+import android.database.MatrixCursor;
+import android.database.MergeCursor;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.graphics.Typeface;
+import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.Drawable;
 import android.os.Bundle;
-import android.support.v4.content.ContextCompat;
-import android.support.v4.widget.CursorAdapter;
-import android.support.v7.app.ActionBar;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.Toolbar;
+import android.preference.PreferenceManager;
+import android.util.SparseBooleanArray;
+import android.view.ActionMode;
+import android.view.Menu;
+import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.WindowManager;
+import android.widget.AbsListView;
+import android.widget.AdapterView;
+import android.widget.EditText;
 import android.widget.ImageView;
 import android.widget.ListView;
+import android.widget.RadioButton;
+import android.widget.ResourceCursorAdapter;
+import android.widget.Spinner;
 import android.widget.TextView;
 
+import androidx.appcompat.app.ActionBar;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.widget.Toolbar;  // The AndroidX toolbar must be used until the minimum API is >= 21.
+import androidx.core.content.ContextCompat;
+import androidx.cursoradapter.widget.CursorAdapter;
+import androidx.fragment.app.DialogFragment;  // The AndroidX dialog fragment must be used or an error is produced on API <=22.
+
+import com.google.android.material.snackbar.Snackbar;
+
 import com.stoutner.privacybrowser.R;
+import com.stoutner.privacybrowser.dialogs.EditBookmarkDatabaseViewDialog;
+import com.stoutner.privacybrowser.dialogs.EditBookmarkFolderDatabaseViewDialog;
 import com.stoutner.privacybrowser.helpers.BookmarksDatabaseHelper;
 
-public class BookmarksDatabaseViewActivity extends AppCompatActivity {
-    // `bookmarksDatabaseHelper` is used in `onCreate()` and `updateBookmarksListView()`.
+import java.io.ByteArrayOutputStream;
+import java.util.Arrays;
+
+public class BookmarksDatabaseViewActivity extends AppCompatActivity implements EditBookmarkDatabaseViewDialog.EditBookmarkDatabaseViewListener,
+        EditBookmarkFolderDatabaseViewDialog.EditBookmarkFolderDatabaseViewListener {
+    // Instantiate the constants.
+    private static final int ALL_FOLDERS_DATABASE_ID = -2;
+    private static final int HOME_FOLDER_DATABASE_ID = -1;
+
+    // `bookmarksDatabaseHelper` is used in `onCreate()`, `updateBookmarksListView()`, `selectAllBookmarksInFolder()`, and `onDestroy()`.
     private BookmarksDatabaseHelper bookmarksDatabaseHelper;
 
-    // `bookmarksListView` is used in `onCreate()` and `updateBookmarksListView()`.
-    private ListView bookmarksListView;
+    // `bookmarksCursor` is used in `onCreate()`, `updateBookmarksListView()`, `onSaveBookmark()`, `onSaveBookmarkFolder()`, and `onDestroy()`.
+    private Cursor bookmarksCursor;
+
+    // `bookmarksCursorAdapter` is used in `onCreate()`, `selectAllBookmarksInFolder()`, and `updateBookmarksListView()`.
+    private CursorAdapter bookmarksCursorAdapter;
+
+    // `oldFolderNameString` is used in `onCreate()` and `onSaveBookmarkFolder()`.
+    private String oldFolderNameString;
+
+    // `currentFolderDatabaseId` is used in `onCreate()`, `updateBookmarksListView()`, `onSaveBookmark()`, and `onSaveBookmarkFolder()`.
+    private int currentFolderDatabaseId;
+
+    // `currentFolder` is used in `onCreate()`, `onSaveBookmark()`, and `onSaveBookmarkFolder()`.
+    private String currentFolderName;
+
+    // `sortByDisplayOrder` is used in `onCreate()`, `onOptionsItemSelected()`, and `updateBookmarksListView()`.
+    private boolean sortByDisplayOrder;
+
+    // `bookmarksDeletedSnackbar` is used in `onCreate()`, `onOptionsItemSelected()`, and `onBackPressed()`.
+    private Snackbar bookmarksDeletedSnackbar;
+
+    // `closeActivityAfterDismissingSnackbar` is used in `onCreate()`, `onOptionsItemSelected()`, and `onBackPressed()`.
+    private boolean closeActivityAfterDismissingSnackbar;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
+        // Get a handle for the shared preferences.
+        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
+
+        // Get the theme and screenshot preferences.
+        boolean darkTheme = sharedPreferences.getBoolean("dark_theme", false);
+        boolean allowScreenshots = sharedPreferences.getBoolean("allow_screenshots", false);
+
+        // Disable screenshots if not allowed.
+        if (!allowScreenshots) {
+            getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
+        }
+
+        // Set the activity theme.
+        if (darkTheme) {
+            setTheme(R.style.PrivacyBrowserDark_SecondaryActivity);
+        } else {
+            setTheme(R.style.PrivacyBrowserLight_SecondaryActivity);
+        }
+
+        // Run the default commands.
         super.onCreate(savedInstanceState);
-        setContentView(R.layout.bookmarks_database_view_coordinatorlayout);
 
-        // We need to use the `SupportActionBar` from `android.support.v7.app.ActionBar` until the minimum API is >= 21.
-        final Toolbar bookmarksDatabaseViewAppBar = (Toolbar) findViewById(R.id.bookmarks_database_view_toolbar);
-        setSupportActionBar(bookmarksDatabaseViewAppBar);
+        // Get the intent that launched the activity.
+        Intent launchingIntent = getIntent();
 
-        // Display the home arrow on `SupportActionBar`.
-        final ActionBar appBar = getSupportActionBar();
-        assert appBar != null;  // This assert removes the incorrect warning in Android Studio on the following line that appBar might be null.
-        appBar.setDisplayHomeAsUpEnabled(true);
+        // Get the favorite icon byte array.
+        byte[] favoriteIconByteArray = launchingIntent.getByteArrayExtra("favorite_icon_byte_array");
 
-        // Initialize the database handler and the ListView.
-        // `this` specifies the context.  The two `null`s do not specify the database name or a `CursorFactory`.
-        // The `0` is to specify a database version, but that is set instead using a constant in `BookmarksDatabaseHelper`.
+        // Remove the incorrect lint warning below that the favorite icon byte array might be null.
+        assert favoriteIconByteArray != null;
+
+        // Convert the favorite icon byte array to a bitmap and store it in a class variable.
+        Bitmap favoriteIconBitmap = BitmapFactory.decodeByteArray(favoriteIconByteArray, 0, favoriteIconByteArray.length);
+
+        // Set the content view.
+        setContentView(R.layout.bookmarks_databaseview_coordinatorlayout);
+
+        // The AndroidX toolbar must be used until the minimum API is >= 21.
+        Toolbar toolbar = findViewById(R.id.bookmarks_databaseview_toolbar);
+        setSupportActionBar(toolbar);
+
+        // Get a handle for the action bar.
+        ActionBar actionBar = getSupportActionBar();
+
+        // Remove the incorrect lint warning that the action bar might be null.
+        assert actionBar != null;
+
+        // Display the spinner and the back arrow in the action bar.
+        actionBar.setCustomView(R.layout.spinner);
+        actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM | ActionBar.DISPLAY_HOME_AS_UP);
+
+        // Initialize the database handler.  The `0` is to specify a database version, but that is set instead using a constant in `BookmarksDatabaseHelper`.
         bookmarksDatabaseHelper = new BookmarksDatabaseHelper(this, null, null, 0);
-        bookmarksListView = (ListView) findViewById(R.id.bookmarks_database_view_listview);
 
-        // Display the bookmarks in the ListView.
-        updateBookmarksListView();
+        // Setup a matrix cursor for "All Folders" and "Home Folder".
+        String[] matrixCursorColumnNames = {BookmarksDatabaseHelper._ID, BookmarksDatabaseHelper.BOOKMARK_NAME};
+        MatrixCursor matrixCursor = new MatrixCursor(matrixCursorColumnNames);
+        matrixCursor.addRow(new Object[]{ALL_FOLDERS_DATABASE_ID, getString(R.string.all_folders)});
+        matrixCursor.addRow(new Object[]{HOME_FOLDER_DATABASE_ID, getString(R.string.home_folder)});
 
-    }
+        // Get a cursor with the list of all the folders.
+        Cursor foldersCursor = bookmarksDatabaseHelper.getAllFolders();
+
+        // Combine `matrixCursor` and `foldersCursor`.
+        MergeCursor foldersMergeCursor = new MergeCursor(new Cursor[]{matrixCursor, foldersCursor});
+
+
+        // Get the default folder bitmap.  `ContextCompat` must be used until the minimum API >= 21.
+        Drawable defaultFolderDrawable = ContextCompat.getDrawable(getApplicationContext(), R.drawable.folder_blue_bitmap);
+
+        // Cast the default folder drawable to a `BitmapDrawable`.
+        BitmapDrawable defaultFolderBitmapDrawable = (BitmapDrawable) defaultFolderDrawable;
+
+        // Remove the incorrect lint warning that `.getBitmap()` might be null.
+        assert defaultFolderBitmapDrawable != null;
+
+        // Convert the default folder `BitmapDrawable` to a bitmap.
+        Bitmap defaultFolderBitmap = defaultFolderBitmapDrawable.getBitmap();
+
+
+        // Create a resource cursor adapter for the spinner.
+        ResourceCursorAdapter foldersCursorAdapter = new ResourceCursorAdapter(this, R.layout.appbar_spinner_item, foldersMergeCursor, 0) {
+            @Override
+            public void bindView(View view, Context context, Cursor cursor) {
+                // Get handles for the spinner views.
+                ImageView spinnerItemImageView = view.findViewById(R.id.spinner_item_imageview);
+                TextView spinnerItemTextView = view.findViewById(R.id.spinner_item_textview);
+
+                // Set the folder icon according to the type.
+                if (foldersMergeCursor.getPosition() > 1) {  // Set a user folder icon.
+                    // Initialize a default folder icon byte array output stream.
+                    ByteArrayOutputStream defaultFolderIconByteArrayOutputStream = new ByteArrayOutputStream();
+
+                    // 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).
+                    defaultFolderBitmap.compress(Bitmap.CompressFormat.PNG, 0, defaultFolderIconByteArrayOutputStream);
+
+                    // Convert the default folder icon output stream to a byte array.
+                    byte[] defaultFolderIconByteArray = defaultFolderIconByteArrayOutputStream.toByteArray();
+
+
+                    // Get the folder icon byte array from the cursor.
+                    byte[] folderIconByteArray = cursor.getBlob(cursor.getColumnIndex(BookmarksDatabaseHelper.FAVORITE_ICON));
+
+                    // Convert the byte array to a bitmap beginning at the first byte and ending at the last.
+                    Bitmap folderIconBitmap = BitmapFactory.decodeByteArray(folderIconByteArray, 0, folderIconByteArray.length);
+
+
+                    // Set the icon according to the type.
+                    if (Arrays.equals(folderIconByteArray, defaultFolderIconByteArray)) {  // The default folder icon is used.
+                        // Set a smaller and darker folder icon, which works well with the spinner.
+                        spinnerItemImageView.setImageDrawable(ContextCompat.getDrawable(context, R.drawable.folder_dark_blue));
+                    } else {  // A custom folder icon is uses.
+                        // Set the folder image stored in the cursor.
+                        spinnerItemImageView.setImageBitmap(folderIconBitmap);
+                    }
+                } else {  // Set the `All Folders` or `Home Folder` icon.
+                    // Set the gray folder image.  `ContextCompat` must be used until the minimum API >= 21.
+                    spinnerItemImageView.setImageDrawable(ContextCompat.getDrawable(context, R.drawable.folder_gray));
+                }
+
+                // Set the text view to display the folder name.
+                spinnerItemTextView.setText(cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME)));
+            }
+        };
+
+        // Set the resource cursor adapter drop drown view resource.
+        foldersCursorAdapter.setDropDownViewResource(R.layout.appbar_spinner_dropdown_item);
+
+        // Get a handle for the folder spinner and set the adapter.
+        Spinner folderSpinner = findViewById(R.id.spinner);
+        folderSpinner.setAdapter(foldersCursorAdapter);
+
+        // Handle taps on the spinner dropdown.
+        folderSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
+                // Store the current folder database ID.
+                currentFolderDatabaseId = (int) id;
+
+                // Get a handle for the selected view.
+                TextView selectedFolderTextView = findViewById(R.id.spinner_item_textview);
+
+                // Store the current folder name.
+                currentFolderName = selectedFolderTextView.getText().toString();
+
+                // Update the list view.
+                updateBookmarksListView();
+            }
+
+            @Override
+            public void onNothingSelected(AdapterView<?> parent) {
+                // Do nothing.
+            }
+        });
+
+        // Get a handle for the bookmarks `ListView`.
+        ListView bookmarksListView = findViewById(R.id.bookmarks_databaseview_listview);
 
-    private void updateBookmarksListView() {
         // Get a `Cursor` with the current contents of the bookmarks database.
-        final Cursor bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksCursor();
+        bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarks();
 
-        // Setup `bookmarksCursorAdapter` with `this` context.  The `false` disables autoRequery.
-        CursorAdapter bookmarksCursorAdapter = new CursorAdapter(this, bookmarksCursor, false) {
+        // Setup a `CursorAdapter` with `this` context.  `false` disables autoRequery.
+        bookmarksCursorAdapter = new CursorAdapter(this, bookmarksCursor, false) {
             @Override
             public View newView(Context context, Cursor cursor, ViewGroup parent) {
                 // Inflate the individual item layout.  `false` does not attach it to the root.
-                return getLayoutInflater().inflate(R.layout.bookmarks_database_view_item_linearlayout, parent, false);
+                return getLayoutInflater().inflate(R.layout.bookmarks_databaseview_item_linearlayout, parent, false);
             }
 
             @Override
@@ -89,7 +278,7 @@ public class BookmarksDatabaseViewActivity extends AppCompatActivity {
 
                 // Get the database ID from the `Cursor` and display it in `bookmarkDatabaseIdTextView`.
                 int bookmarkDatabaseId = cursor.getInt(cursor.getColumnIndex(BookmarksDatabaseHelper._ID));
-                TextView bookmarkDatabaseIdTextView = (TextView) view.findViewById(R.id.bookmarks_database_view_database_id);
+                TextView bookmarkDatabaseIdTextView = view.findViewById(R.id.bookmarks_databaseview_database_id);
                 bookmarkDatabaseIdTextView.setText(String.valueOf(bookmarkDatabaseId));
 
                 // Get the favorite icon byte array from the `Cursor`.
@@ -97,30 +286,44 @@ public class BookmarksDatabaseViewActivity extends AppCompatActivity {
                 // Convert the byte array to a `Bitmap` beginning at the beginning at the first byte and ending at the last.
                 Bitmap favoriteIconBitmap = BitmapFactory.decodeByteArray(favoriteIconByteArray, 0, favoriteIconByteArray.length);
                 // Display the bitmap in `bookmarkFavoriteIcon`.
-                ImageView bookmarkFavoriteIcon = (ImageView) view.findViewById(R.id.bookmarks_database_view_favorite_icon);
+                ImageView bookmarkFavoriteIcon = view.findViewById(R.id.bookmarks_databaseview_favorite_icon);
                 bookmarkFavoriteIcon.setImageBitmap(favoriteIconBitmap);
 
                 // Get the bookmark name from the `Cursor` and display it in `bookmarkNameTextView`.
                 String bookmarkNameString = cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
-                TextView bookmarkNameTextView = (TextView) view.findViewById(R.id.bookmarks_database_view_bookmark_name);
+                TextView bookmarkNameTextView = view.findViewById(R.id.bookmarks_databaseview_bookmark_name);
                 bookmarkNameTextView.setText(bookmarkNameString);
+
                 // Make the font bold for folders.
                 if (isFolder) {
-                    // The first argument is `null` because we don't want to change the font.
+                    // The first argument is `null` prevent changing of the font.
                     bookmarkNameTextView.setTypeface(null, Typeface.BOLD);
                 } else {  // Reset the font to default.
                     bookmarkNameTextView.setTypeface(Typeface.DEFAULT);
                 }
 
+                // Get the bookmark URL form the `Cursor` and display it in `bookmarkUrlTextView`.
+                String bookmarkUrlString = cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_URL));
+                TextView bookmarkUrlTextView = view.findViewById(R.id.bookmarks_databaseview_bookmark_url);
+                bookmarkUrlTextView.setText(bookmarkUrlString);
+
+                // Hide the URL if the bookmark is a folder.
+                if (isFolder) {
+                    bookmarkUrlTextView.setVisibility(View.GONE);
+                } else {
+                    bookmarkUrlTextView.setVisibility(View.VISIBLE);
+                }
+
                 // Get the display order from the `Cursor` and display it in `bookmarkDisplayOrderTextView`.
                 int bookmarkDisplayOrder = cursor.getInt(cursor.getColumnIndex(BookmarksDatabaseHelper.DISPLAY_ORDER));
-                TextView bookmarkDisplayOrderTextView = (TextView) view.findViewById(R.id.bookmarks_database_view_display_order);
+                TextView bookmarkDisplayOrderTextView = view.findViewById(R.id.bookmarks_databaseview_display_order);
                 bookmarkDisplayOrderTextView.setText(String.valueOf(bookmarkDisplayOrder));
 
                 // Get the parent folder from the `Cursor` and display it in `bookmarkParentFolder`.
                 String bookmarkParentFolder = cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.PARENT_FOLDER));
-                ImageView parentFolderImageView = (ImageView) view.findViewById(R.id.bookmarks_database_view_parent_folder_icon);
-                TextView bookmarkParentFolderTextView = (TextView) view.findViewById(R.id.bookmarks_database_view_parent_folder);
+                ImageView parentFolderImageView = view.findViewById(R.id.bookmarks_databaseview_parent_folder_icon);
+                TextView bookmarkParentFolderTextView = view.findViewById(R.id.bookmarks_databaseview_parent_folder);
+
                 // Make the folder name gray if it is the home folder.
                 if (bookmarkParentFolder.isEmpty()) {
                     parentFolderImageView.setImageDrawable(ContextCompat.getDrawable(getApplicationContext(), R.drawable.folder_gray));
@@ -129,22 +332,555 @@ public class BookmarksDatabaseViewActivity extends AppCompatActivity {
                 } else {
                     parentFolderImageView.setImageDrawable(ContextCompat.getDrawable(getApplicationContext(), R.drawable.folder_dark_blue));
                     bookmarkParentFolderTextView.setText(bookmarkParentFolder);
-                    bookmarkParentFolderTextView.setTextColor(ContextCompat.getColor(getApplicationContext(), R.color.black));
-                }
 
-                // Get the bookmark URL form the `Cursor` and display it in `bookmarkUrlTextView`.
-                String bookmarkUrlString = cursor.getString(cursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_URL));
-                TextView bookmarkUrlTextView = (TextView) view.findViewById(R.id.bookmarks_database_view_bookmark_url);
-                bookmarkUrlTextView.setText(bookmarkUrlString);
-                if (isFolder) {
-                    bookmarkUrlTextView.setVisibility(View.GONE);
-                } else {
-                    bookmarkUrlTextView.setVisibility(View.VISIBLE);
+                    // Set the text color according to the theme.
+                    if (darkTheme) {
+                        bookmarkParentFolderTextView.setTextColor(ContextCompat.getColor(getApplicationContext(), R.color.gray_300));
+                    } else {
+                        bookmarkParentFolderTextView.setTextColor(ContextCompat.getColor(getApplicationContext(), R.color.black));
+                    }
                 }
             }
         };
 
         // Update the ListView.
         bookmarksListView.setAdapter(bookmarksCursorAdapter);
+
+        // Set the current folder database ID.
+        currentFolderDatabaseId = ALL_FOLDERS_DATABASE_ID;
+
+        // Set a listener to edit a bookmark when it is tapped.
+        bookmarksListView.setOnItemClickListener((AdapterView<?> parent, View view, int position, long id) -> {
+            // Convert the database ID to an int.
+            int databaseId = (int) id;
+
+            // Show the edit bookmark or edit bookmark folder dialog.
+            if (bookmarksDatabaseHelper.isFolder(databaseId)) {
+                // Save the current folder name, which is used in `onSaveBookmarkFolder()`.
+                oldFolderNameString = bookmarksCursor.getString(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
+
+                // Show the edit bookmark folder dialog.
+                DialogFragment editBookmarkFolderDatabaseViewDialog = EditBookmarkFolderDatabaseViewDialog.folderDatabaseId(databaseId, favoriteIconBitmap);
+                editBookmarkFolderDatabaseViewDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_folder));
+            } else {
+                // Show the edit bookmark dialog.
+                DialogFragment editBookmarkDatabaseViewDialog = EditBookmarkDatabaseViewDialog.bookmarkDatabaseId(databaseId, favoriteIconBitmap);
+                editBookmarkDatabaseViewDialog.show(getSupportFragmentManager(), getResources().getString(R.string.edit_bookmark));
+            }
+        });
+
+        // Handle long presses on the list view.
+        bookmarksListView.setMultiChoiceModeListener(new AbsListView.MultiChoiceModeListener() {
+            // Instantiate the common variables.
+            MenuItem selectAllMenuItem;
+            MenuItem deleteMenuItem;
+            boolean deletingBookmarks;
+
+            @Override
+            public boolean onCreateActionMode(ActionMode mode, Menu menu) {
+                // Inflate the menu for the contextual app bar.
+                getMenuInflater().inflate(R.menu.bookmarks_databaseview_context_menu, menu);
+
+                // Set the title.
+                mode.setTitle(R.string.bookmarks);
+
+                // Get handles for the menu items.
+                selectAllMenuItem = menu.findItem(R.id.select_all);
+                deleteMenuItem = menu.findItem(R.id.delete);
+
+                // Disable the delete menu item if a delete is pending.
+                deleteMenuItem.setEnabled(!deletingBookmarks);
+
+                // Make it so.
+                return true;
+            }
+
+            @Override
+            public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
+                // Do nothing.
+                return false;
+            }
+
+            @Override
+            public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
+                // Calculate the number of selected bookmarks.
+                int numberOfSelectedBookmarks = bookmarksListView.getCheckedItemCount();
+
+                // Adjust the ActionMode according to the number of selected bookmarks.
+                mode.setSubtitle(getString(R.string.selected) + "  " + numberOfSelectedBookmarks);
+
+                // Do not show the select all menu item if all the bookmarks are already checked.
+                if (bookmarksListView.getCheckedItemCount() == bookmarksListView.getCount()) {
+                    selectAllMenuItem.setVisible(false);
+                } else {
+                    selectAllMenuItem.setVisible(true);
+                }
+
+                // Convert the database ID to an int.
+                int databaseId = (int) id;
+
+                // If a folder was selected, also select all the contents.
+                if (checked && bookmarksDatabaseHelper.isFolder(databaseId)) {
+                    selectAllBookmarksInFolder(databaseId);
+                }
+
+                // Do not allow a bookmark to be deselected if the folder is selected.
+                if (!checked) {
+                    // Get the folder name.
+                    String folderName = bookmarksDatabaseHelper.getParentFolderName((int) id);
+
+                    // If the bookmark is not in the root folder, check to see if the folder is selected.
+                    if (!folderName.isEmpty()) {
+                        // Get the database ID of the folder.
+                        int folderDatabaseId = bookmarksDatabaseHelper.getFolderDatabaseId(folderName);
+
+                        // Move the bookmarks cursor to the first position.
+                        bookmarksCursor.moveToFirst();
+
+                        // Initialize the folder position variable.
+                        int folderPosition = -1;
+
+                        // Get the position of the folder in the bookmarks cursor.
+                        while ((folderPosition < 0) && (bookmarksCursor.getPosition() < bookmarksCursor.getCount())) {
+                            // Check if the folder database ID matches the bookmark database ID.
+                            if (folderDatabaseId == bookmarksCursor.getInt((bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper._ID)))) {
+                                // Get the folder position.
+                                folderPosition = bookmarksCursor.getPosition();
+
+                                // Check if the folder is selected.
+                                if (bookmarksListView.isItemChecked(folderPosition)) {
+                                    // Reselect the bookmark.
+                                    bookmarksListView.setItemChecked(position, true);
+
+                                    // Display a snackbar explaining why the bookmark cannot be deselected.
+                                    Snackbar.make(bookmarksListView, R.string.cannot_deselect_bookmark, Snackbar.LENGTH_LONG).show();
+                                }
+                            }
+
+                            // Increment the bookmarks cursor.
+                            bookmarksCursor.moveToNext();
+                        }
+                    }
+                }
+            }
+
+            @Override
+            public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
+                switch (item.getItemId()) {
+                    case R.id.select_all:
+                        // Get the total number of bookmarks.
+                        int numberOfBookmarks = bookmarksListView.getCount();
+
+                        // Select them all.
+                        for (int i = 0; i < numberOfBookmarks; i++) {
+                            bookmarksListView.setItemChecked(i, true);
+                        }
+                        break;
+
+                    case R.id.delete:
+                        // Set the deleting bookmarks flag, which prevents the delete menu item from being enabled until the current process finishes.
+                        deletingBookmarks = true;
+
+                        // Get an array of the selected row IDs.
+                        long[] selectedBookmarksIdsLongArray = bookmarksListView.getCheckedItemIds();
+
+                        // 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.
+                        SparseBooleanArray selectedBookmarksPositionsSparseBooleanArray = bookmarksListView.getCheckedItemPositions().clone();
+
+                        // Update the bookmarks cursor with the current contents of the bookmarks database except for the specified database IDs.
+                        switch (currentFolderDatabaseId) {
+                            // Get a cursor with all the folders.
+                            case ALL_FOLDERS_DATABASE_ID:
+                                if (sortByDisplayOrder) {
+                                    bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksByDisplayOrderExcept(selectedBookmarksIdsLongArray);
+                                } else {
+                                    bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksExcept(selectedBookmarksIdsLongArray);
+                                }
+                                break;
+
+                            // Get a cursor for the home folder.
+                            case HOME_FOLDER_DATABASE_ID:
+                                if (sortByDisplayOrder) {
+                                    bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrderExcept(selectedBookmarksIdsLongArray, "");
+                                } else {
+                                    bookmarksCursor = bookmarksDatabaseHelper.getBookmarksExcept(selectedBookmarksIdsLongArray, "");
+                                }
+                                break;
+
+                            // Display the selected folder.
+                            default:
+                                // Get a cursor for the selected folder.
+                                if (sortByDisplayOrder) {
+                                    bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrderExcept(selectedBookmarksIdsLongArray, currentFolderName);
+                                } else {
+                                    bookmarksCursor = bookmarksDatabaseHelper.getBookmarksExcept(selectedBookmarksIdsLongArray, currentFolderName);
+                                }
+                        }
+
+                        // Update the list view.
+                        bookmarksCursorAdapter.changeCursor(bookmarksCursor);
+
+                        // Create a Snackbar with the number of deleted bookmarks.
+                        bookmarksDeletedSnackbar = Snackbar.make(findViewById(R.id.bookmarks_databaseview_coordinatorlayout),
+                                getString(R.string.bookmarks_deleted) + "  " + selectedBookmarksIdsLongArray.length, Snackbar.LENGTH_LONG)
+                                .setAction(R.string.undo, view -> {
+                                    // Do nothing because everything will be handled by `onDismissed()` below.
+                                })
+                                .addCallback(new Snackbar.Callback() {
+                                    @SuppressLint("SwitchIntDef")  // Ignore the lint warning about not handling the other possible events as they are covered by `default:`.
+                                    @Override
+                                    public void onDismissed(Snackbar snackbar, int event) {
+                                        if (event == Snackbar.Callback.DISMISS_EVENT_ACTION) {  // The user pushed the undo button.
+                                            // Update the bookmarks list view with the current contents of the bookmarks database, including the "deleted bookmarks.
+                                            updateBookmarksListView();
+
+                                            // Re-select the previously selected bookmarks.
+                                            for (int i = 0; i < selectedBookmarksPositionsSparseBooleanArray.size(); i++) {
+                                                bookmarksListView.setItemChecked(selectedBookmarksPositionsSparseBooleanArray.keyAt(i), true);
+                                            }
+                                        } else {  // The Snackbar was dismissed without the undo button being pushed.
+                                            // Delete each selected bookmark.
+                                            for (long databaseIdLong : selectedBookmarksIdsLongArray) {
+                                                // Convert `databaseIdLong` to an int.
+                                                int databaseIdInt = (int) databaseIdLong;
+
+                                                // Delete the selected bookmark.
+                                                bookmarksDatabaseHelper.deleteBookmark(databaseIdInt);
+                                            }
+                                        }
+
+                                        // Reset the deleting bookmarks flag.
+                                        deletingBookmarks = false;
+
+                                        // Enable the delete menu item.
+                                        deleteMenuItem.setEnabled(true);
+
+                                        // Close the activity if back has been pressed.
+                                        if (closeActivityAfterDismissingSnackbar) {
+                                            onBackPressed();
+                                        }
+                                    }
+                                });
+
+                        // Show the Snackbar.
+                        bookmarksDeletedSnackbar.show();
+                        break;
+                }
+
+                // Consume the click.
+                return false;
+            }
+
+            @Override
+            public void onDestroyActionMode(ActionMode mode) {
+                // Do nothing.
+            }
+        });
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        // Inflate the menu.
+        getMenuInflater().inflate(R.menu.bookmarks_databaseview_options_menu, menu);
+
+        // Success.
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem menuItem) {
+        // Get a handle for the shared preferences.
+        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
+
+        // Get the theme preferences.
+        boolean darkTheme = sharedPreferences.getBoolean("dark_theme", false);
+
+        // Get the ID of the menu item that was selected.
+        int menuItemId = menuItem.getItemId();
+
+        // Run the command that corresponds to the selected menu item.
+        switch (menuItemId) {
+            case android.R.id.home:  // The home arrow is identified as `android.R.id.home`, not just `R.id.home`.
+                // Exit the activity.
+                onBackPressed();
+                break;
+
+            case R.id.options_menu_sort:
+                // Update the sort by display order tracker.
+                sortByDisplayOrder = !sortByDisplayOrder;
+
+                // Get a handle for the bookmarks `ListView`.
+                ListView bookmarksListView = findViewById(R.id.bookmarks_databaseview_listview);
+
+                // Update the icon and display a snackbar.
+                if (sortByDisplayOrder) {  // Sort by display order.
+                    // Update the icon according to the theme.
+                    if (darkTheme) {
+                        menuItem.setIcon(R.drawable.sort_selected_dark);
+                    } else {
+                        menuItem.setIcon(R.drawable.sort_selected_light);
+                    }
+
+                    // Display a Snackbar indicating the current sort type.
+                    Snackbar.make(bookmarksListView, R.string.sorted_by_display_order, Snackbar.LENGTH_SHORT).show();
+                } else {  // Sort by database id.
+                    // Update the icon according to the theme.
+                    if (darkTheme) {
+                        menuItem.setIcon(R.drawable.sort_dark);
+                    } else {
+                        menuItem.setIcon(R.drawable.sort_light);
+                    }
+
+                    // Display a Snackbar indicating the current sort type.
+                    Snackbar.make(bookmarksListView, R.string.sorted_by_database_id, Snackbar.LENGTH_SHORT).show();
+                }
+
+                // Update the list view.
+                updateBookmarksListView();
+                break;
+        }
+        return true;
+    }
+
+    @Override
+    public void onBackPressed() {
+        // 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.
+        if ((bookmarksDeletedSnackbar != null) && bookmarksDeletedSnackbar.isShown()) { // Close the bookmarks deleted snackbar before going home.
+            // Set the close flag.
+            closeActivityAfterDismissingSnackbar = true;
+
+            // Dismiss the snackbar.
+            bookmarksDeletedSnackbar.dismiss();
+        } else {  // Go home immediately.
+            // Update the current folder in the bookmarks activity.
+            if ((currentFolderDatabaseId == ALL_FOLDERS_DATABASE_ID) || (currentFolderDatabaseId == HOME_FOLDER_DATABASE_ID)) {  // All folders or the the home folder are currently displayed.
+                // Load the home folder.
+                BookmarksActivity.currentFolder = "";
+            } else {  // A subfolder is currently displayed.
+                // Load the current folder.
+                BookmarksActivity.currentFolder = currentFolderName;
+            }
+
+            // Reload the bookmarks list view when returning to the bookmarks activity.
+            BookmarksActivity.restartFromBookmarksDatabaseViewActivity = true;
+
+            // Exit the bookmarks database view activity.
+            super.onBackPressed();
+        }
+    }
+
+    private void updateBookmarksListView() {
+        // Populate the bookmarks list view based on the spinner selection.
+        switch (currentFolderDatabaseId) {
+            // Get a cursor with all the folders.
+            case ALL_FOLDERS_DATABASE_ID:
+                if (sortByDisplayOrder) {
+                    bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarksByDisplayOrder();
+                } else {
+                    bookmarksCursor = bookmarksDatabaseHelper.getAllBookmarks();
+                }
+                break;
+
+            // Get a cursor for the home folder.
+            case HOME_FOLDER_DATABASE_ID:
+                if (sortByDisplayOrder) {
+                    bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder("");
+                } else {
+                    bookmarksCursor = bookmarksDatabaseHelper.getBookmarks("");
+                }
+                break;
+
+            // Display the selected folder.
+            default:
+                // Get a cursor for the selected folder.
+                if (sortByDisplayOrder) {
+                    bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentFolderName);
+                } else {
+                    bookmarksCursor = bookmarksDatabaseHelper.getBookmarks(currentFolderName);
+                }
+        }
+
+        // Update the list view.
+        bookmarksCursorAdapter.changeCursor(bookmarksCursor);
+    }
+
+    private void selectAllBookmarksInFolder(int folderId) {
+        // Get a handle for the bookmarks list view.
+        ListView bookmarksListView = findViewById(R.id.bookmarks_databaseview_listview);
+
+        // Get the folder name.
+        String folderName = bookmarksDatabaseHelper.getFolderName(folderId);
+
+        // Get a cursor with the contents of the folder.
+        Cursor folderCursor = bookmarksDatabaseHelper.getBookmarks(folderName);
+
+        // Move to the beginning of the cursor.
+        folderCursor.moveToFirst();
+
+        while (folderCursor.getPosition() < folderCursor.getCount()) {
+            // Get the bookmark database ID.
+            int bookmarkId = folderCursor.getInt(folderCursor.getColumnIndex(BookmarksDatabaseHelper._ID));
+
+            // Move the bookmarks cursor to the first position.
+            bookmarksCursor.moveToFirst();
+
+            // Initialize the bookmark position variable.
+            int bookmarkPosition = -1;
+
+            // Get the position of this bookmark in the bookmarks cursor.
+            while ((bookmarkPosition < 0) && (bookmarksCursor.getPosition() < bookmarksCursor.getCount())) {
+                // Check if the bookmark IDs match.
+                if (bookmarkId == bookmarksCursor.getInt(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper._ID))) {
+                    // Get the bookmark position.
+                    bookmarkPosition = bookmarksCursor.getPosition();
+
+                    // If this bookmark is a folder, select all the bookmarks inside it.
+                    if (bookmarksDatabaseHelper.isFolder(bookmarkId)) {
+                        selectAllBookmarksInFolder(bookmarkId);
+                    }
+
+                    // Select the bookmark.
+                    bookmarksListView.setItemChecked(bookmarkPosition, true);
+                }
+
+                // Increment the bookmarks cursor position.
+                bookmarksCursor.moveToNext();
+            }
+
+            // Move to the next position.
+            folderCursor.moveToNext();
+        }
+    }
+
+    @Override
+    public void onSaveBookmark(DialogFragment dialogFragment, int selectedBookmarkDatabaseId, Bitmap favoriteIconBitmap) {
+        // Get the dialog from the dialog fragment.
+        Dialog dialog = dialogFragment.getDialog();
+
+        // Remove the incorrect lint warning below that the dialog might be null.
+        assert dialog != null;
+
+        // Get handles for the views from dialog fragment.
+        RadioButton currentBookmarkIconRadioButton = dialog.findViewById(R.id.edit_bookmark_current_icon_radiobutton);
+        EditText editBookmarkNameEditText = dialog.findViewById(R.id.edit_bookmark_name_edittext);
+        EditText editBookmarkUrlEditText = dialog.findViewById(R.id.edit_bookmark_url_edittext);
+        Spinner folderSpinner = dialog.findViewById(R.id.edit_bookmark_folder_spinner);
+        EditText displayOrderEditText = dialog.findViewById(R.id.edit_bookmark_display_order_edittext);
+
+        // Extract the bookmark information.
+        String bookmarkNameString = editBookmarkNameEditText.getText().toString();
+        String bookmarkUrlString = editBookmarkUrlEditText.getText().toString();
+        int folderDatabaseId = (int) folderSpinner.getSelectedItemId();
+        int displayOrderInt = Integer.parseInt(displayOrderEditText.getText().toString());
+
+        // Instantiate the parent folder name `String`.
+        String parentFolderNameString;
+
+        // Set the parent folder name.
+        if (folderDatabaseId == EditBookmarkDatabaseViewDialog.HOME_FOLDER_DATABASE_ID) {  // The home folder is selected.  Use `""`.
+            parentFolderNameString = "";
+        } else {  // Get the parent folder name from the database.
+            parentFolderNameString = bookmarksDatabaseHelper.getFolderName(folderDatabaseId);
+        }
+
+        // Update the bookmark.
+        if (currentBookmarkIconRadioButton.isChecked()) {  // Update the bookmark without changing the favorite icon.
+            bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString, parentFolderNameString, displayOrderInt);
+        } else {  // Update the bookmark using the `WebView` favorite icon.
+            // Create a favorite icon byte array output stream.
+            ByteArrayOutputStream newFavoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
+
+            // Convert the favorite icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
+            favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFavoriteIconByteArrayOutputStream);
+
+            // Convert the favorite icon byte array stream to a byte array.
+            byte[] newFavoriteIconByteArray = newFavoriteIconByteArrayOutputStream.toByteArray();
+
+            //  Update the bookmark and the favorite icon.
+            bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString, parentFolderNameString, displayOrderInt, newFavoriteIconByteArray);
+        }
+
+        // Update the list view.
+        updateBookmarksListView();
+    }
+
+    @Override
+    public void onSaveBookmarkFolder(DialogFragment dialogFragment, int selectedBookmarkDatabaseId, Bitmap favoriteIconBitmap) {
+        // Get the dialog from the dialog fragment.
+        Dialog dialog = dialogFragment.getDialog();
+
+        // Remove the incorrect lint warning below that the dialog might be null.
+        assert dialog != null;
+
+        // Get handles for the views from dialog fragment.
+        RadioButton currentBookmarkIconRadioButton = dialog.findViewById(R.id.edit_folder_current_icon_radiobutton);
+        RadioButton defaultFolderIconRadioButton = dialog.findViewById(R.id.edit_folder_default_icon_radiobutton);
+        ImageView defaultFolderIconImageView = dialog.findViewById(R.id.edit_folder_default_icon_imageview);
+        EditText editBookmarkNameEditText = dialog.findViewById(R.id.edit_folder_name_edittext);
+        Spinner parentFolderSpinner = dialog.findViewById(R.id.edit_folder_parent_folder_spinner);
+        EditText displayOrderEditText = dialog.findViewById(R.id.edit_folder_display_order_edittext);
+
+        // Extract the folder information.
+        String newFolderNameString = editBookmarkNameEditText.getText().toString();
+        int parentFolderDatabaseId = (int) parentFolderSpinner.getSelectedItemId();
+        int displayOrderInt = Integer.parseInt(displayOrderEditText.getText().toString());
+
+        // Instantiate the parent folder name `String`.
+        String parentFolderNameString;
+
+        // Set the parent folder name.
+        if (parentFolderDatabaseId == EditBookmarkFolderDatabaseViewDialog.HOME_FOLDER_DATABASE_ID) {  // The home folder is selected.  Use `""`.
+            parentFolderNameString = "";
+        } else {  // Get the parent folder name from the database.
+            parentFolderNameString = bookmarksDatabaseHelper.getFolderName(parentFolderDatabaseId);
+        }
+
+        // Update the folder.
+        if (currentBookmarkIconRadioButton.isChecked()) {  // Update the folder without changing the favorite icon.
+            bookmarksDatabaseHelper.updateFolder(selectedBookmarkDatabaseId, oldFolderNameString, newFolderNameString, parentFolderNameString, displayOrderInt);
+        } else {  // Update the folder and the icon.
+            // Create the new folder icon Bitmap.
+            Bitmap folderIconBitmap;
+
+            // Populate the new folder icon bitmap.
+            if (defaultFolderIconRadioButton.isChecked()) {
+                // Get the default folder icon drawable.
+                Drawable folderIconDrawable = defaultFolderIconImageView.getDrawable();
+
+                // Convert the folder icon drawable to a bitmap drawable.
+                BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
+
+                // Convert the folder icon bitmap drawable to a bitmap.
+                folderIconBitmap = folderIconBitmapDrawable.getBitmap();
+            } else {  // Use the `WebView` favorite icon.
+                // Get a copy of the favorite icon bitmap.
+                folderIconBitmap = favoriteIconBitmap;
+            }
+
+            // Create a folder icon byte array output stream.
+            ByteArrayOutputStream newFolderIconByteArrayOutputStream = new ByteArrayOutputStream();
+
+            // Convert the folder icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
+            folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFolderIconByteArrayOutputStream);
+
+            // Convert the folder icon byte array stream to a byte array.
+            byte[] newFolderIconByteArray = newFolderIconByteArrayOutputStream.toByteArray();
+
+            //  Update the folder and the icon.
+            bookmarksDatabaseHelper.updateFolder(selectedBookmarkDatabaseId, oldFolderNameString, newFolderNameString, parentFolderNameString, displayOrderInt, newFolderIconByteArray);
+        }
+
+        // Update the list view.
+        updateBookmarksListView();
+    }
+
+    @Override
+    public void onDestroy() {
+        // Close the bookmarks cursor and database.
+        bookmarksCursor.close();
+        bookmarksDatabaseHelper.close();
+
+        // Run the default commands.
+        super.onDestroy();
     }
 }
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