app/src/main/java/com/stoutner/privacybrowser/activities/ImportExportActivity.java

   1 /*
   2  * Copyright © 2018-2021 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.app.Activity;
  23 import android.content.Intent;
  24 import android.content.SharedPreferences;
  25 import android.content.pm.PackageManager;
  26 import android.net.Uri;
  27 import android.os.Build;
  28 import android.os.Bundle;
  29 import android.os.Handler;
  30 import android.preference.PreferenceManager;
  31 import android.text.Editable;
  32 import android.text.TextWatcher;
  33 import android.view.View;
  34 import android.view.WindowManager;
  35 import android.widget.AdapterView;
  36 import android.widget.ArrayAdapter;
  37 import android.widget.Button;
  38 import android.widget.EditText;
  39 import android.widget.LinearLayout;
  40 import android.widget.RadioButton;
  41 import android.widget.Spinner;
  42 import android.widget.TextView;
  43
  44 import androidx.annotation.NonNull;
  45 import androidx.appcompat.app.ActionBar;
  46 import androidx.appcompat.app.AppCompatActivity;
  47 import androidx.appcompat.widget.Toolbar;
  48 import androidx.cardview.widget.CardView;
  49 import androidx.core.content.FileProvider;
  50
  51 import com.google.android.material.snackbar.Snackbar;
  52 import com.google.android.material.textfield.TextInputLayout;
  53
  54 import com.stoutner.privacybrowser.BuildConfig;
  55 import com.stoutner.privacybrowser.R;
  56 import com.stoutner.privacybrowser.helpers.ImportExportDatabaseHelper;
  57
  58 import java.io.File;
  59 import java.io.FileInputStream;
  60 import java.io.FileNotFoundException;
  61 import java.io.FileOutputStream;
  62 import java.io.InputStream;
  63 import java.io.OutputStream;
  64 import java.nio.charset.StandardCharsets;
  65 import java.security.MessageDigest;
  66 import java.security.SecureRandom;
  67 import java.util.Arrays;
  68
  69 import javax.crypto.Cipher;
  70 import javax.crypto.CipherInputStream;
  71 import javax.crypto.CipherOutputStream;
  72 import javax.crypto.spec.GCMParameterSpec;
  73 import javax.crypto.spec.SecretKeySpec;
  74
  75 public class ImportExportActivity extends AppCompatActivity {
  76     // Define the encryption constants.
  77     private final int NO_ENCRYPTION = 0;
  78     private final int PASSWORD_ENCRYPTION = 1;
  79     private final int OPENPGP_ENCRYPTION = 2;
  80
  81     // Define the activity result constants.
  82     private final int BROWSE_RESULT_CODE = 0;
  83     private final int OPENPGP_IMPORT_RESULT_CODE = 1;
  84     private final int OPENPGP_EXPORT_RESULT_CODE = 2;
  85
  86     // Define the saved instance state constants.
  87     private final String ENCRYPTION_PASSWORD_TEXTINPUTLAYOUT_VISIBILITY = "encryption_password_textinputlayout_visibility";
  88     private final String KITKAT_PASSWORD_ENCRYPTED_TEXTVIEW_VISIBILITY = "kitkat_password_encrypted_textview_visibility";
  89     private final String OPEN_KEYCHAIN_REQUIRED_TEXTVIEW_VISIBILITY = "open_keychain_required_textview_visibility";
  90     private final String FILE_LOCATION_CARD_VIEW = "file_location_card_view";
  91     private final String FILE_NAME_LINEARLAYOUT_VISIBILITY = "file_name_linearlayout_visibility";
  92     private final String OPEN_KEYCHAIN_IMPORT_INSTRUCTIONS_TEXTVIEW_VISIBILITY = "open_keychain_import_instructions_textview_visibility";
  93     private final String IMPORT_EXPORT_BUTTON_VISIBILITY = "import_export_button_visibility";
  94     private final String FILE_NAME_TEXT = "file_name_text";
  95     private final String IMPORT_EXPORT_BUTTON_TEXT = "import_export_button_text";
  96
  97     // Define the class views.
  98     Spinner encryptionSpinner;
  99     TextInputLayout encryptionPasswordTextInputLayout;
 100     EditText encryptionPasswordEditText;
 101     TextView kitKatPasswordEncryptionTextView;
 102     TextView openKeychainRequiredTextView;
 103     CardView fileLocationCardView;
 104     RadioButton importRadioButton;
 105     LinearLayout fileNameLinearLayout;
 106     EditText fileNameEditText;
 107     TextView openKeychainImportInstructionsTextView;
 108     Button importExportButton;
 109
 110     // Define the class variables.
 111     private boolean openKeychainInstalled;
 112     private File temporaryPgpEncryptedImportFile;
 113     private File temporaryPreEncryptedExportFile;
 114
 115     @Override
 116     public void onCreate(Bundle savedInstanceState) {
 117         // Get a handle for the shared preferences.
 118         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
 119
 120         // Get the preferences.
 121         boolean allowScreenshots = sharedPreferences.getBoolean(getString(R.string.allow_screenshots_key), false);
 122         boolean bottomAppBar = sharedPreferences.getBoolean(getString(R.string.bottom_app_bar_key), false);
 123
 124         // Disable screenshots if not allowed.
 125         if (!allowScreenshots) {
 126             getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
 127         }
 128
 129         // Set the theme.
 130         setTheme(R.style.PrivacyBrowser);
 131
 132         // Run the default commands.
 133         super.onCreate(savedInstanceState);
 134
 135         // Set the content view.
 136         if (bottomAppBar) {
 137             setContentView(R.layout.import_export_coordinatorlayout_bottom_appbar);
 138         } else {
 139             setContentView(R.layout.import_export_coordinatorlayout_top_appbar);
 140         }
 141
 142         // Get a handle for the toolbar.
 143         Toolbar toolbar = findViewById(R.id.import_export_toolbar);
 144
 145         // Set the support action bar.
 146         setSupportActionBar(toolbar);
 147
 148         // Get a handle for the action bar.
 149         ActionBar actionBar = getSupportActionBar();
 150
 151         // Remove the incorrect lint warning that the action bar might be null.
 152         assert actionBar != null;
 153
 154         // Display the home arrow on the support action bar.
 155         actionBar.setDisplayHomeAsUpEnabled(true);
 156
 157         // Find out if the system is running KitKat
 158         boolean runningKitKat = (Build.VERSION.SDK_INT == 19);
 159
 160         // Find out if OpenKeychain is installed.
 161         try {
 162             openKeychainInstalled = !getPackageManager().getPackageInfo("org.sufficientlysecure.keychain", 0).versionName.isEmpty();
 163         } catch (PackageManager.NameNotFoundException exception) {
 164             openKeychainInstalled = false;
 165         }
 166
 167         // Get handles for the views that need to be modified.
 168         encryptionSpinner = findViewById(R.id.encryption_spinner);
 169         encryptionPasswordTextInputLayout = findViewById(R.id.encryption_password_textinputlayout);
 170         encryptionPasswordEditText = findViewById(R.id.encryption_password_edittext);
 171         kitKatPasswordEncryptionTextView = findViewById(R.id.kitkat_password_encryption_textview);
 172         openKeychainRequiredTextView = findViewById(R.id.openkeychain_required_textview);
 173         fileLocationCardView = findViewById(R.id.file_location_cardview);
 174         importRadioButton = findViewById(R.id.import_radiobutton);
 175         RadioButton exportRadioButton = findViewById(R.id.export_radiobutton);
 176         fileNameLinearLayout = findViewById(R.id.file_name_linearlayout);
 177         fileNameEditText = findViewById(R.id.file_name_edittext);
 178         openKeychainImportInstructionsTextView = findViewById(R.id.openkeychain_import_instructions_textview);
 179         importExportButton = findViewById(R.id.import_export_button);
 180
 181         // Create an array adapter for the spinner.
 182         ArrayAdapter<CharSequence> encryptionArrayAdapter = ArrayAdapter.createFromResource(this, R.array.encryption_type, R.layout.spinner_item);
 183
 184         // Set the drop down view resource on the spinner.
 185         encryptionArrayAdapter.setDropDownViewResource(R.layout.spinner_dropdown_items);
 186
 187         // Set the array adapter for the spinner.
 188         encryptionSpinner.setAdapter(encryptionArrayAdapter);
 189
 190         // Update the UI when the spinner changes.
 191         encryptionSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
 192             @Override
 193             public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
 194                 switch (position) {
 195                     case NO_ENCRYPTION:
 196                         // Hide the unneeded layout items.
 197                         encryptionPasswordTextInputLayout.setVisibility(View.GONE);
 198                         kitKatPasswordEncryptionTextView.setVisibility(View.GONE);
 199                         openKeychainRequiredTextView.setVisibility(View.GONE);
 200                         openKeychainImportInstructionsTextView.setVisibility(View.GONE);
 201
 202                         // Show the file location card.
 203                         fileLocationCardView.setVisibility(View.VISIBLE);
 204
 205                         // Show the file name linear layout if either import or export is checked.
 206                         if (importRadioButton.isChecked() || exportRadioButton.isChecked()) {
 207                             fileNameLinearLayout.setVisibility(View.VISIBLE);
 208                         }
 209
 210                         // Reset the text of the import button, which may have been changed to `Decrypt`.
 211                         if (importRadioButton.isChecked()) {
 212                             importExportButton.setText(R.string.import_button);
 213                         }
 214
 215                         // Enable the import/export button if the file name is populated.
 216                         importExportButton.setEnabled(!fileNameEditText.getText().toString().isEmpty());
 217                         break;
 218
 219                     case PASSWORD_ENCRYPTION:
 220                         if (runningKitKat) {
 221                             // Show the KitKat password encryption message.
 222                             kitKatPasswordEncryptionTextView.setVisibility(View.VISIBLE);
 223
 224                             // Hide the OpenPGP required text view and the file location card.
 225                             openKeychainRequiredTextView.setVisibility(View.GONE);
 226                             fileLocationCardView.setVisibility(View.GONE);
 227                         } else {
 228                             // Hide the OpenPGP layout items.
 229                             openKeychainRequiredTextView.setVisibility(View.GONE);
 230                             openKeychainImportInstructionsTextView.setVisibility(View.GONE);
 231
 232                             // Show the password encryption layout items.
 233                             encryptionPasswordTextInputLayout.setVisibility(View.VISIBLE);
 234
 235                             // Show the file location card.
 236                             fileLocationCardView.setVisibility(View.VISIBLE);
 237
 238                             // Show the file name linear layout if either import or export is checked.
 239                             if (importRadioButton.isChecked() || exportRadioButton.isChecked()) {
 240                                 fileNameLinearLayout.setVisibility(View.VISIBLE);
 241                             }
 242
 243                             // Reset the text of the import button, which may have been changed to `Decrypt`.
 244                             if (importRadioButton.isChecked()) {
 245                                 importExportButton.setText(R.string.import_button);
 246                             }
 247
 248                             // Enable the import/button if both the password and the file name are populated.
 249                             importExportButton.setEnabled(!fileNameEditText.getText().toString().isEmpty() && !encryptionPasswordEditText.getText().toString().isEmpty());
 250                         }
 251                         break;
 252
 253                     case OPENPGP_ENCRYPTION:
 254                         // Hide the password encryption layout items.
 255                         encryptionPasswordTextInputLayout.setVisibility(View.GONE);
 256                         kitKatPasswordEncryptionTextView.setVisibility(View.GONE);
 257
 258                         // Updated items based on the installation status of OpenKeychain.
 259                         if (openKeychainInstalled) {  // OpenKeychain is installed.
 260                             // Show the file location card.
 261                             fileLocationCardView.setVisibility(View.VISIBLE);
 262
 263                             if (importRadioButton.isChecked()) {
 264                                 // Show the file name linear layout and the OpenKeychain import instructions.
 265                                 fileNameLinearLayout.setVisibility(View.VISIBLE);
 266                                 openKeychainImportInstructionsTextView.setVisibility(View.VISIBLE);
 267
 268                                 // Set the text of the import button to be `Decrypt`.
 269                                 importExportButton.setText(R.string.decrypt);
 270
 271                                 // Enable the import button if the file name is populated.
 272                                 importExportButton.setEnabled(!fileNameEditText.getText().toString().isEmpty());
 273                             } else if (exportRadioButton.isChecked()) {
 274                                 // Hide the file name linear layout and the OpenKeychain import instructions.
 275                                 fileNameLinearLayout.setVisibility(View.GONE);
 276                                 openKeychainImportInstructionsTextView.setVisibility(View.GONE);
 277
 278                                 // Enable the export button.
 279                                 importExportButton.setEnabled(true);
 280                             }
 281                         } else {  // OpenKeychain is not installed.
 282                             // Show the OpenPGP required layout item.
 283                             openKeychainRequiredTextView.setVisibility(View.VISIBLE);
 284
 285                             // Hide the file location card.
 286                             fileLocationCardView.setVisibility(View.GONE);
 287                         }
 288                         break;
 289                 }
 290             }
 291
 292             @Override
 293             public void onNothingSelected(AdapterView<?> parent) {
 294
 295             }
 296         });
 297
 298         // Update the status of the import/export button when the password changes.
 299         encryptionPasswordEditText.addTextChangedListener(new TextWatcher() {
 300             @Override
 301             public void beforeTextChanged(CharSequence s, int start, int count, int after) {
 302                 // Do nothing.
 303             }
 304
 305             @Override
 306             public void onTextChanged(CharSequence s, int start, int before, int count) {
 307                 // Do nothing.
 308             }
 309
 310             @Override
 311             public void afterTextChanged(Editable s) {
 312                 // Enable the import/export button if both the file string and the password are populated.
 313                 importExportButton.setEnabled(!fileNameEditText.getText().toString().isEmpty() && !encryptionPasswordEditText.getText().toString().isEmpty());
 314             }
 315         });
 316
 317         // Update the UI when the file name EditText changes.
 318         fileNameEditText.addTextChangedListener(new TextWatcher() {
 319             @Override
 320             public void beforeTextChanged(CharSequence s, int start, int count, int after) {
 321                 // Do nothing.
 322             }
 323
 324             @Override
 325             public void onTextChanged(CharSequence s, int start, int before, int count) {
 326                 // Do nothing.
 327             }
 328
 329             @Override
 330             public void afterTextChanged(Editable s) {
 331                 // Adjust the UI according to the encryption spinner position.
 332                 if (encryptionSpinner.getSelectedItemPosition() == PASSWORD_ENCRYPTION) {
 333                     // Enable the import/export button if both the file name and the password are populated.
 334                     importExportButton.setEnabled(!fileNameEditText.getText().toString().isEmpty() && !encryptionPasswordEditText.getText().toString().isEmpty());
 335                 } else {
 336                     // Enable the export button if the file name is populated.
 337                     importExportButton.setEnabled(!fileNameEditText.getText().toString().isEmpty());
 338                 }
 339             }
 340         });
 341
 342         // Check to see if the activity has been restarted.
 343         if (savedInstanceState == null) {  // The app has not been restarted.
 344             // Initially hide the unneeded views.
 345             encryptionPasswordTextInputLayout.setVisibility(View.GONE);
 346             kitKatPasswordEncryptionTextView.setVisibility(View.GONE);
 347             openKeychainRequiredTextView.setVisibility(View.GONE);
 348             fileNameLinearLayout.setVisibility(View.GONE);
 349             openKeychainImportInstructionsTextView.setVisibility(View.GONE);
 350             importExportButton.setVisibility(View.GONE);
 351         } else {  // The app has been restarted.
 352             // Restore the visibility of the views.
 353             encryptionPasswordTextInputLayout.setVisibility(savedInstanceState.getInt(ENCRYPTION_PASSWORD_TEXTINPUTLAYOUT_VISIBILITY));
 354             kitKatPasswordEncryptionTextView.setVisibility(savedInstanceState.getInt(KITKAT_PASSWORD_ENCRYPTED_TEXTVIEW_VISIBILITY));
 355             openKeychainRequiredTextView.setVisibility(savedInstanceState.getInt(OPEN_KEYCHAIN_REQUIRED_TEXTVIEW_VISIBILITY));
 356             fileLocationCardView.setVisibility(savedInstanceState.getInt(FILE_LOCATION_CARD_VIEW));
 357             fileNameLinearLayout.setVisibility(savedInstanceState.getInt(FILE_NAME_LINEARLAYOUT_VISIBILITY));
 358             openKeychainImportInstructionsTextView.setVisibility(savedInstanceState.getInt(OPEN_KEYCHAIN_IMPORT_INSTRUCTIONS_TEXTVIEW_VISIBILITY));
 359             importExportButton.setVisibility(savedInstanceState.getInt(IMPORT_EXPORT_BUTTON_VISIBILITY));
 360
 361             // Restore the text.
 362             fileNameEditText.post(() -> fileNameEditText.setText(savedInstanceState.getString(FILE_NAME_TEXT)));
 363             importExportButton.setText(savedInstanceState.getString(IMPORT_EXPORT_BUTTON_TEXT));
 364         }
 365     }
 366
 367     @Override
 368     public void onSaveInstanceState (@NonNull Bundle savedInstanceState) {
 369         // Run the default commands.
 370         super.onSaveInstanceState(savedInstanceState);
 371
 372         // Save the visibility of the views.
 373         savedInstanceState.putInt(ENCRYPTION_PASSWORD_TEXTINPUTLAYOUT_VISIBILITY, encryptionPasswordTextInputLayout.getVisibility());
 374         savedInstanceState.putInt(KITKAT_PASSWORD_ENCRYPTED_TEXTVIEW_VISIBILITY, kitKatPasswordEncryptionTextView.getVisibility());
 375         savedInstanceState.putInt(OPEN_KEYCHAIN_REQUIRED_TEXTVIEW_VISIBILITY, openKeychainRequiredTextView.getVisibility());
 376         savedInstanceState.putInt(FILE_LOCATION_CARD_VIEW, fileLocationCardView.getVisibility());
 377         savedInstanceState.putInt(FILE_NAME_LINEARLAYOUT_VISIBILITY, fileNameLinearLayout.getVisibility());
 378         savedInstanceState.putInt(OPEN_KEYCHAIN_IMPORT_INSTRUCTIONS_TEXTVIEW_VISIBILITY, openKeychainImportInstructionsTextView.getVisibility());
 379         savedInstanceState.putInt(IMPORT_EXPORT_BUTTON_VISIBILITY, importExportButton.getVisibility());
 380
 381         // Save the text.
 382         savedInstanceState.putString(FILE_NAME_TEXT, fileNameEditText.getText().toString());
 383         savedInstanceState.putString(IMPORT_EXPORT_BUTTON_TEXT, importExportButton.getText().toString());
 384     }
 385
 386     public void onClickRadioButton(View view) {
 387         // Get the current file name.
 388         String fileNameString = fileNameEditText.getText().toString();
 389
 390         // Convert the file name string to a file.
 391         File file = new File(fileNameString);
 392
 393         // Check to see if import or export was selected.
 394         if (view.getId() == R.id.import_radiobutton) {  // The import radio button is selected.
 395             // Check to see if OpenPGP encryption is selected.
 396             if (encryptionSpinner.getSelectedItemPosition() == OPENPGP_ENCRYPTION) {  // OpenPGP encryption selected.
 397                 // Show the OpenKeychain import instructions.
 398                 openKeychainImportInstructionsTextView.setVisibility(View.VISIBLE);
 399
 400                 // Set the text on the import/export button to be `Decrypt`.
 401                 importExportButton.setText(R.string.decrypt);
 402             } else {  // OpenPGP encryption not selected.
 403                 // Hide the OpenKeychain import instructions.
 404                 openKeychainImportInstructionsTextView.setVisibility(View.GONE);
 405
 406                 // Set the text on the import/export button to be `Import`.
 407                 importExportButton.setText(R.string.import_button);
 408             }
 409
 410             // Display the file name views.
 411             fileNameLinearLayout.setVisibility(View.VISIBLE);
 412             importExportButton.setVisibility(View.VISIBLE);
 413
 414             // Check to see if the file exists.
 415             if (file.exists()) {  // The file exists.
 416                 // Check to see if password encryption is selected.
 417                 if (encryptionSpinner.getSelectedItemPosition() == PASSWORD_ENCRYPTION) {  // Password encryption is selected.
 418                     // Enable the import button if the encryption password is populated.
 419                     importExportButton.setEnabled(!encryptionPasswordEditText.getText().toString().isEmpty());
 420                 } else {  // Password encryption is not selected.
 421                     // Enable the import/decrypt button.
 422                     importExportButton.setEnabled(true);
 423                 }
 424             } else {  // The file does not exist.
 425                 // Disable the import/decrypt button.
 426                 importExportButton.setEnabled(false);
 427             }
 428         } else {  // The export radio button is selected.
 429             // Hide the OpenKeychain import instructions.
 430             openKeychainImportInstructionsTextView.setVisibility(View.GONE);
 431
 432             // Set the text on the import/export button to be `Export`.
 433             importExportButton.setText(R.string.export);
 434
 435             // Show the import/export button.
 436             importExportButton.setVisibility(View.VISIBLE);
 437
 438             // Check to see if OpenPGP encryption is selected.
 439             if (encryptionSpinner.getSelectedItemPosition() == OPENPGP_ENCRYPTION) {  // OpenPGP encryption is selected.
 440                 // Hide the file name views.
 441                 fileNameLinearLayout.setVisibility(View.GONE);
 442
 443                 // Enable the export button.
 444                 importExportButton.setEnabled(true);
 445             } else {  // OpenPGP encryption is not selected.
 446                 // Show the file name view.
 447                 fileNameLinearLayout.setVisibility(View.VISIBLE);
 448
 449                 // Check the encryption type.
 450                 if (encryptionSpinner.getSelectedItemPosition() == NO_ENCRYPTION) {  // No encryption is selected.
 451                     // Enable the export button if the file name is populated.
 452                     importExportButton.setEnabled(!fileNameString.isEmpty());
 453                 } else {  // Password encryption is selected.
 454                     // Enable the export button if the file name and the password are populated.
 455                     importExportButton.setEnabled(!fileNameString.isEmpty() && !encryptionPasswordEditText.getText().toString().isEmpty());
 456                 }
 457             }
 458         }
 459     }
 460
 461     public void browse(View view) {
 462         // Check to see if import or export is selected.
 463         if (importRadioButton.isChecked()) {  // Import is selected.
 464             // Create the file picker intent.
 465             Intent importBrowseIntent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
 466
 467             // Set the intent MIME type to include all files so that everything is visible.
 468             importBrowseIntent.setType("*/*");
 469
 470             // Request a file that can be opened.
 471             importBrowseIntent.addCategory(Intent.CATEGORY_OPENABLE);
 472
 473             // Launch the file picker.
 474             startActivityForResult(importBrowseIntent, BROWSE_RESULT_CODE);
 475         } else {  // Export is selected
 476             // Create the file picker intent.
 477             Intent exportBrowseIntent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
 478
 479             // Set the intent MIME type to include all files so that everything is visible.
 480             exportBrowseIntent.setType("*/*");
 481
 482             // Set the initial export file name according to the encryption type.
 483             if (encryptionSpinner.getSelectedItemPosition() == NO_ENCRYPTION) {  // No encryption is selected.
 484                 exportBrowseIntent.putExtra(Intent.EXTRA_TITLE, getString(R.string.settings) + " " + BuildConfig.VERSION_NAME + ".pbs");
 485             } else {  // Password encryption is selected.
 486                 exportBrowseIntent.putExtra(Intent.EXTRA_TITLE, getString(R.string.settings) + " " + BuildConfig.VERSION_NAME + ".pbs.aes");
 487             }
 488
 489             // Request a file that can be opened.
 490             exportBrowseIntent.addCategory(Intent.CATEGORY_OPENABLE);
 491
 492             // Launch the file picker.
 493             startActivityForResult(exportBrowseIntent, BROWSE_RESULT_CODE);
 494         }
 495     }
 496
 497     @Override
 498     public void onActivityResult(int requestCode, int resultCode, Intent returnedIntent) {
 499         // Run the default commands.
 500         super.onActivityResult(requestCode, resultCode, returnedIntent);
 501
 502         switch (requestCode) {
 503             case (BROWSE_RESULT_CODE):
 504                 // Only do something if the user didn't press back from the file picker.
 505                 if (resultCode == Activity.RESULT_OK) {
 506                     // Get the file path URI from the intent.
 507                     Uri fileNameUri = returnedIntent.getData();
 508
 509                     // Get the file name string from the URI.
 510                     String fileNameString = fileNameUri.toString();
 511
 512                     // Set the file name name text.
 513                     fileNameEditText.setText(fileNameString);
 514
 515                     // Move the cursor to the end of the file name edit text.
 516                     fileNameEditText.setSelection(fileNameString.length());
 517                 }
 518                 break;
 519
 520             case OPENPGP_IMPORT_RESULT_CODE:
 521                 // Delete the temporary PGP encrypted import file.
 522                 if (temporaryPgpEncryptedImportFile.exists()) {
 523                     //noinspection ResultOfMethodCallIgnored
 524                     temporaryPgpEncryptedImportFile.delete();
 525                 }
 526                 break;
 527
 528             case OPENPGP_EXPORT_RESULT_CODE:
 529                 // Delete the temporary pre-encrypted export file if it exists.
 530                 if (temporaryPreEncryptedExportFile.exists()) {
 531                     //noinspection ResultOfMethodCallIgnored
 532                     temporaryPreEncryptedExportFile.delete();
 533                 }
 534                 break;
 535         }
 536     }
 537
 538     public void importExport(View view) {
 539         // Instantiate the import export database helper.
 540         ImportExportDatabaseHelper importExportDatabaseHelper = new ImportExportDatabaseHelper();
 541
 542         // Check to see if import or export is selected.
 543         if (importRadioButton.isChecked()) {  // Import is selected.
 544             // Initialize the import status string
 545             String importStatus = "";
 546
 547             // Get the file name string.
 548             String fileNameString = fileNameEditText.getText().toString();
 549
 550             // Import according to the encryption type.
 551             switch (encryptionSpinner.getSelectedItemPosition()) {
 552                 case NO_ENCRYPTION:
 553                     try {
 554                         // Get an input stream for the file name.
 555                         InputStream inputStream = getContentResolver().openInputStream(Uri.parse(fileNameString));
 556
 557                         // Import the unencrypted file.
 558                         importStatus = importExportDatabaseHelper.importUnencrypted(inputStream, this);
 559                     } catch (FileNotFoundException exception) {
 560                         // Update the import status.
 561                         importStatus = exception.toString();
 562                     }
 563
 564                     // Restart Privacy Browser if successful.
 565                     if (importStatus.equals(ImportExportDatabaseHelper.IMPORT_SUCCESSFUL)) {
 566                         restartPrivacyBrowser();
 567                     }
 568                     break;
 569
 570                 case PASSWORD_ENCRYPTION:
 571                     try {
 572                         // Get the encryption password.
 573                         String encryptionPasswordString = encryptionPasswordEditText.getText().toString();
 574
 575                         // Get an input stream for the file name.
 576                         InputStream inputStream = getContentResolver().openInputStream(Uri.parse(fileNameString));
 577
 578                         // Get the salt from the beginning of the import file.
 579                         byte[] saltByteArray = new byte[32];
 580                         //noinspection ResultOfMethodCallIgnored
 581                         inputStream.read(saltByteArray);
 582
 583                         // Get the initialization vector from the import file.
 584                         byte[] initializationVector = new byte[12];
 585                         //noinspection ResultOfMethodCallIgnored
 586                         inputStream.read(initializationVector);
 587
 588                         // Convert the encryption password to a byte array.
 589                         byte[] encryptionPasswordByteArray = encryptionPasswordString.getBytes(StandardCharsets.UTF_8);
 590
 591                         // Append the salt to the encryption password byte array.  This protects against rainbow table attacks.
 592                         byte[] encryptionPasswordWithSaltByteArray = new byte[encryptionPasswordByteArray.length + saltByteArray.length];
 593                         System.arraycopy(encryptionPasswordByteArray, 0, encryptionPasswordWithSaltByteArray, 0, encryptionPasswordByteArray.length);
 594                         System.arraycopy(saltByteArray, 0, encryptionPasswordWithSaltByteArray, encryptionPasswordByteArray.length, saltByteArray.length);
 595
 596                         // Get a SHA-512 message digest.
 597                         MessageDigest messageDigest = MessageDigest.getInstance("SHA-512");
 598
 599                         // Hash the salted encryption password.  Otherwise, any characters after the 32nd character in the password are ignored.
 600                         byte[] hashedEncryptionPasswordWithSaltByteArray = messageDigest.digest(encryptionPasswordWithSaltByteArray);
 601
 602                         // Truncate the encryption password byte array to 256 bits (32 bytes).
 603                         byte[] truncatedHashedEncryptionPasswordWithSaltByteArray = Arrays.copyOf(hashedEncryptionPasswordWithSaltByteArray, 32);
 604
 605                         // Create an AES secret key from the encryption password byte array.
 606                         SecretKeySpec secretKey = new SecretKeySpec(truncatedHashedEncryptionPasswordWithSaltByteArray, "AES");
 607
 608                         // Get a Advanced Encryption Standard, Galois/Counter Mode, No Padding cipher instance. Galois/Counter mode protects against modification of the ciphertext.  It doesn't use padding.
 609                         Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
 610
 611                         // Set the GCM tag length to be 128 bits (the maximum) and apply the initialization vector.
 612                         GCMParameterSpec gcmParameterSpec = new GCMParameterSpec(128, initializationVector);
 613
 614                         // Initialize the cipher.
 615                         cipher.init(Cipher.DECRYPT_MODE, secretKey, gcmParameterSpec);
 616
 617                         // Create a cipher input stream.
 618                         CipherInputStream cipherInputStream = new CipherInputStream(inputStream, cipher);
 619
 620                         // Initialize variables to store data as it is moved from the cipher input stream to the unencrypted import file output stream.  Move 128 bits (16 bytes) at a time.
 621                         int numberOfBytesRead;
 622                         byte[] decryptedBytes = new byte[16];
 623
 624
 625                         // Create a private temporary unencrypted import file.
 626                         File temporaryUnencryptedImportFile = File.createTempFile("temporary_unencrypted_import_file", null, getApplicationContext().getCacheDir());
 627
 628                         // Create an temporary unencrypted import file output stream.
 629                         FileOutputStream temporaryUnencryptedImportFileOutputStream = new FileOutputStream(temporaryUnencryptedImportFile);
 630
 631
 632                         // Read up to 128 bits (16 bytes) of data from the cipher input stream.  `-1` will be returned when the end fo the file is reached.
 633                         while ((numberOfBytesRead = cipherInputStream.read(decryptedBytes)) != -1) {
 634                             // Write the data to the temporary unencrypted import file output stream.
 635                             temporaryUnencryptedImportFileOutputStream.write(decryptedBytes, 0, numberOfBytesRead);
 636                         }
 637
 638
 639                         // Flush the temporary unencrypted import file output stream.
 640                         temporaryUnencryptedImportFileOutputStream.flush();
 641
 642                         // Close the streams.
 643                         temporaryUnencryptedImportFileOutputStream.close();
 644                         cipherInputStream.close();
 645                         inputStream.close();
 646
 647                         // Wipe the encryption data from memory.
 648                         //noinspection UnusedAssignment
 649                         encryptionPasswordString = "";
 650                         Arrays.fill(saltByteArray, (byte) 0);
 651                         Arrays.fill(initializationVector, (byte) 0);
 652                         Arrays.fill(encryptionPasswordByteArray, (byte) 0);
 653                         Arrays.fill(encryptionPasswordWithSaltByteArray, (byte) 0);
 654                         Arrays.fill(hashedEncryptionPasswordWithSaltByteArray, (byte) 0);
 655                         Arrays.fill(truncatedHashedEncryptionPasswordWithSaltByteArray, (byte) 0);
 656                         Arrays.fill(decryptedBytes, (byte) 0);
 657
 658                         // Create a temporary unencrypted import file input stream.
 659                         FileInputStream temporaryUnencryptedImportFileInputStream = new FileInputStream(temporaryUnencryptedImportFile);
 660
 661                         // Import the temporary unencrypted import file.
 662                         importStatus = importExportDatabaseHelper.importUnencrypted(temporaryUnencryptedImportFileInputStream, this);
 663
 664                         // Close the temporary unencrypted import file input stream.
 665                         temporaryUnencryptedImportFileInputStream.close();
 666
 667                         // Delete the temporary unencrypted import file.
 668                         //noinspection ResultOfMethodCallIgnored
 669                         temporaryUnencryptedImportFile.delete();
 670
 671                         // Restart Privacy Browser if successful.
 672                         if (importStatus.equals(ImportExportDatabaseHelper.IMPORT_SUCCESSFUL)) {
 673                             restartPrivacyBrowser();
 674                         }
 675                     } catch (Exception exception) {
 676                         // Update the import status.
 677                         importStatus = exception.toString();
 678                     }
 679                     break;
 680
 681                 case OPENPGP_ENCRYPTION:
 682                     try {
 683                         // Set the temporary PGP encrypted import file.
 684                         temporaryPgpEncryptedImportFile = File.createTempFile("temporary_pgp_encrypted_import_file", null, getApplicationContext().getCacheDir());
 685
 686                         // Create a temporary PGP encrypted import file output stream.
 687                         FileOutputStream temporaryPgpEncryptedImportFileOutputStream = new FileOutputStream(temporaryPgpEncryptedImportFile);
 688
 689                         // Get an input stream for the file name.
 690                         InputStream inputStream = getContentResolver().openInputStream(Uri.parse(fileNameString));
 691
 692                         // Create a transfer byte array.
 693                         byte[] transferByteArray = new byte[1024];
 694
 695                         // Create an integer to track the number of bytes read.
 696                         int bytesRead;
 697
 698                         // Copy the input stream to the temporary PGP encrypted import file.
 699                         while ((bytesRead = inputStream.read(transferByteArray)) > 0) {
 700                             temporaryPgpEncryptedImportFileOutputStream.write(transferByteArray, 0, bytesRead);
 701                         }
 702
 703                         // Flush the temporary PGP encrypted import file output stream.
 704                         temporaryPgpEncryptedImportFileOutputStream.flush();
 705
 706                         // Close the streams.
 707                         inputStream.close();
 708                         temporaryPgpEncryptedImportFileOutputStream.close();
 709
 710                         // Create an decryption intent for OpenKeychain.
 711                         Intent openKeychainDecryptIntent = new Intent("org.sufficientlysecure.keychain.action.DECRYPT_DATA");
 712
 713                         // Include the URI to be decrypted.
 714                         openKeychainDecryptIntent.setData(FileProvider.getUriForFile(this, getString(R.string.file_provider), temporaryPgpEncryptedImportFile));
 715
 716                         // Allow OpenKeychain to read the file URI.
 717                         openKeychainDecryptIntent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
 718
 719                         // Send the intent to the OpenKeychain package.
 720                         openKeychainDecryptIntent.setPackage("org.sufficientlysecure.keychain");
 721
 722                         // Make it so.
 723                         startActivityForResult(openKeychainDecryptIntent, OPENPGP_IMPORT_RESULT_CODE);
 724
 725                         // Update the import status.
 726                         importStatus = ImportExportDatabaseHelper.IMPORT_SUCCESSFUL;
 727                     } catch (Exception exception) {
 728                         // Update the import status.
 729                         importStatus = exception.toString();
 730                     }
 731                     break;
 732             }
 733
 734             // Respond to the import status.
 735             if (!importStatus.equals(ImportExportDatabaseHelper.IMPORT_SUCCESSFUL)) {
 736                 // Display a snack bar with the import error.
 737                 Snackbar.make(fileNameEditText, getString(R.string.import_failed) + "  " + importStatus, Snackbar.LENGTH_INDEFINITE).show();
 738             }
 739         } else {  // Export is selected.
 740             // Export according to the encryption type.
 741             switch (encryptionSpinner.getSelectedItemPosition()) {
 742                 case NO_ENCRYPTION:
 743                     // Get the file name string.
 744                     String noEncryptionFileNameString = fileNameEditText.getText().toString();
 745
 746                     try {
 747                         // Get the export file output stream.
 748                         OutputStream exportFileOutputStream = getContentResolver().openOutputStream(Uri.parse(noEncryptionFileNameString));
 749
 750                         // Export the unencrypted file.
 751                         String noEncryptionExportStatus = importExportDatabaseHelper.exportUnencrypted(exportFileOutputStream, this);
 752
 753                         // Display an export disposition snackbar.
 754                         if (noEncryptionExportStatus.equals(ImportExportDatabaseHelper.EXPORT_SUCCESSFUL)) {
 755                             Snackbar.make(fileNameEditText, getString(R.string.export_successful), Snackbar.LENGTH_SHORT).show();
 756                         } else {
 757                             Snackbar.make(fileNameEditText, getString(R.string.export_failed) + "  " + noEncryptionExportStatus, Snackbar.LENGTH_INDEFINITE).show();
 758                         }
 759                     } catch (FileNotFoundException fileNotFoundException) {
 760                         // Display a snackbar with the exception.
 761                         Snackbar.make(fileNameEditText, getString(R.string.export_failed) + "  " + fileNotFoundException, Snackbar.LENGTH_INDEFINITE).show();
 762                     }
 763                     break;
 764
 765                 case PASSWORD_ENCRYPTION:
 766                     try {
 767                         // Create a temporary unencrypted export file.
 768                         File temporaryUnencryptedExportFile = File.createTempFile("temporary_unencrypted_export_file", null, getApplicationContext().getCacheDir());
 769
 770                         // Create a temporary unencrypted export output stream.
 771                         FileOutputStream temporaryUnencryptedExportOutputStream = new FileOutputStream(temporaryUnencryptedExportFile);
 772
 773                         // Populate the temporary unencrypted export.
 774                         String passwordEncryptionExportStatus = importExportDatabaseHelper.exportUnencrypted(temporaryUnencryptedExportOutputStream, this);
 775
 776                         // Close the temporary unencrypted export output stream.
 777                         temporaryUnencryptedExportOutputStream.close();
 778
 779                         // Create an unencrypted export file input stream.
 780                         FileInputStream unencryptedExportFileInputStream = new FileInputStream(temporaryUnencryptedExportFile);
 781
 782                         // Get the encryption password.
 783                         String encryptionPasswordString = encryptionPasswordEditText.getText().toString();
 784
 785                         // Initialize a secure random number generator.
 786                         SecureRandom secureRandom = new SecureRandom();
 787
 788                         // Get a 256 bit (32 byte) random salt.
 789                         byte[] saltByteArray = new byte[32];
 790                         secureRandom.nextBytes(saltByteArray);
 791
 792                         // Convert the encryption password to a byte array.
 793                         byte[] encryptionPasswordByteArray = encryptionPasswordString.getBytes(StandardCharsets.UTF_8);
 794
 795                         // Append the salt to the encryption password byte array.  This protects against rainbow table attacks.
 796                         byte[] encryptionPasswordWithSaltByteArray = new byte[encryptionPasswordByteArray.length + saltByteArray.length];
 797                         System.arraycopy(encryptionPasswordByteArray, 0, encryptionPasswordWithSaltByteArray, 0, encryptionPasswordByteArray.length);
 798                         System.arraycopy(saltByteArray, 0, encryptionPasswordWithSaltByteArray, encryptionPasswordByteArray.length, saltByteArray.length);
 799
 800                         // Get a SHA-512 message digest.
 801                         MessageDigest messageDigest = MessageDigest.getInstance("SHA-512");
 802
 803                         // Hash the salted encryption password.  Otherwise, any characters after the 32nd character in the password are ignored.
 804                         byte[] hashedEncryptionPasswordWithSaltByteArray = messageDigest.digest(encryptionPasswordWithSaltByteArray);
 805
 806                         // Truncate the encryption password byte array to 256 bits (32 bytes).
 807                         byte[] truncatedHashedEncryptionPasswordWithSaltByteArray = Arrays.copyOf(hashedEncryptionPasswordWithSaltByteArray, 32);
 808
 809                         // Create an AES secret key from the encryption password byte array.
 810                         SecretKeySpec secretKey = new SecretKeySpec(truncatedHashedEncryptionPasswordWithSaltByteArray, "AES");
 811
 812                         // Generate a random 12 byte initialization vector.  According to NIST, a 12 byte initialization vector is more secure than a 16 byte one.
 813                         byte[] initializationVector = new byte[12];
 814                         secureRandom.nextBytes(initializationVector);
 815
 816                         // Get a Advanced Encryption Standard, Galois/Counter Mode, No Padding cipher instance. Galois/Counter mode protects against modification of the ciphertext.  It doesn't use padding.
 817                         Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
 818
 819                         // Set the GCM tag length to be 128 bits (the maximum) and apply the initialization vector.
 820                         GCMParameterSpec gcmParameterSpec = new GCMParameterSpec(128, initializationVector);
 821
 822                         // Initialize the cipher.
 823                         cipher.init(Cipher.ENCRYPT_MODE, secretKey, gcmParameterSpec);
 824
 825                         // Get the file name string.
 826                         String passwordEncryptionFileNameString = fileNameEditText.getText().toString();
 827
 828                         // Get the export file output stream.
 829                         OutputStream exportFileOutputStream = getContentResolver().openOutputStream(Uri.parse(passwordEncryptionFileNameString));
 830
 831                         // Add the salt and the initialization vector to the export file output stream.
 832                         exportFileOutputStream.write(saltByteArray);
 833                         exportFileOutputStream.write(initializationVector);
 834
 835                         // Create a cipher output stream.
 836                         CipherOutputStream cipherOutputStream = new CipherOutputStream(exportFileOutputStream, cipher);
 837
 838                         // Initialize variables to store data as it is moved from the unencrypted export file input stream to the cipher output stream.  Move 128 bits (16 bytes) at a time.
 839                         int numberOfBytesRead;
 840                         byte[] encryptedBytes = new byte[16];
 841
 842                         // Read up to 128 bits (16 bytes) of data from the unencrypted export file stream.  `-1` will be returned when the end of the file is reached.
 843                         while ((numberOfBytesRead = unencryptedExportFileInputStream.read(encryptedBytes)) != -1) {
 844                             // Write the data to the cipher output stream.
 845                             cipherOutputStream.write(encryptedBytes, 0, numberOfBytesRead);
 846                         }
 847
 848                         // Close the streams.
 849                         cipherOutputStream.flush();
 850                         cipherOutputStream.close();
 851                         exportFileOutputStream.close();
 852                         unencryptedExportFileInputStream.close();
 853
 854                         // Wipe the encryption data from memory.
 855                         //noinspection UnusedAssignment
 856                         encryptionPasswordString = "";
 857                         Arrays.fill(saltByteArray, (byte) 0);
 858                         Arrays.fill(encryptionPasswordByteArray, (byte) 0);
 859                         Arrays.fill(encryptionPasswordWithSaltByteArray, (byte) 0);
 860                         Arrays.fill(hashedEncryptionPasswordWithSaltByteArray, (byte) 0);
 861                         Arrays.fill(truncatedHashedEncryptionPasswordWithSaltByteArray, (byte) 0);
 862                         Arrays.fill(initializationVector, (byte) 0);
 863                         Arrays.fill(encryptedBytes, (byte) 0);
 864
 865                         // Delete the temporary unencrypted export file.
 866                         //noinspection ResultOfMethodCallIgnored
 867                         temporaryUnencryptedExportFile.delete();
 868
 869                         // Display an export disposition snackbar.
 870                         if (passwordEncryptionExportStatus.equals(ImportExportDatabaseHelper.EXPORT_SUCCESSFUL)) {
 871                             Snackbar.make(fileNameEditText, getString(R.string.export_successful), Snackbar.LENGTH_SHORT).show();
 872                         } else {
 873                             Snackbar.make(fileNameEditText, getString(R.string.export_failed) + "  " + passwordEncryptionExportStatus, Snackbar.LENGTH_INDEFINITE).show();
 874                         }
 875                     } catch (Exception exception) {
 876                         // Display a snackbar with the exception.
 877                         Snackbar.make(fileNameEditText, getString(R.string.export_failed) + "  " + exception, Snackbar.LENGTH_INDEFINITE).show();
 878                     }
 879                     break;
 880
 881                 case OPENPGP_ENCRYPTION:
 882                     try {
 883                         // Set the temporary pre-encrypted export file.
 884                         temporaryPreEncryptedExportFile = new File(getApplicationContext().getCacheDir() + "/" + getString(R.string.settings) + " " + BuildConfig.VERSION_NAME + ".pbs");
 885
 886                         // Delete the temporary pre-encrypted export file if it already exists.
 887                         if (temporaryPreEncryptedExportFile.exists()) {
 888                             //noinspection ResultOfMethodCallIgnored
 889                             temporaryPreEncryptedExportFile.delete();
 890                         }
 891
 892                         // Create a temporary pre-encrypted export output stream.
 893                         FileOutputStream temporaryPreEncryptedExportOutputStream = new FileOutputStream(temporaryPreEncryptedExportFile);
 894
 895                         // Populate the temporary pre-encrypted export file.
 896                         String openpgpEncryptionExportStatus = importExportDatabaseHelper.exportUnencrypted(temporaryPreEncryptedExportOutputStream, this);
 897
 898                         // Flush the temporary pre-encryption export output stream.
 899                         temporaryPreEncryptedExportOutputStream.flush();
 900
 901                         // Close the temporary pre-encryption export output stream.
 902                         temporaryPreEncryptedExportOutputStream.close();
 903
 904                         // Display an export error snackbar if the temporary pre-encrypted export failed.
 905                         if (!openpgpEncryptionExportStatus.equals(ImportExportDatabaseHelper.EXPORT_SUCCESSFUL)) {
 906                             Snackbar.make(fileNameEditText, getString(R.string.export_failed) + "  " + openpgpEncryptionExportStatus, Snackbar.LENGTH_INDEFINITE).show();
 907                         }
 908
 909                         // Create an encryption intent for OpenKeychain.
 910                         Intent openKeychainEncryptIntent = new Intent("org.sufficientlysecure.keychain.action.ENCRYPT_DATA");
 911
 912                         // Include the temporary unencrypted export file URI.
 913                         openKeychainEncryptIntent.setData(FileProvider.getUriForFile(this, getString(R.string.file_provider), temporaryPreEncryptedExportFile));
 914
 915                         // Allow OpenKeychain to read the file URI.
 916                         openKeychainEncryptIntent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
 917
 918                         // Send the intent to the OpenKeychain package.
 919                         openKeychainEncryptIntent.setPackage("org.sufficientlysecure.keychain");
 920
 921                         // Make it so.
 922                         startActivityForResult(openKeychainEncryptIntent, OPENPGP_EXPORT_RESULT_CODE);
 923                     } catch (Exception exception) {
 924                         // Display a snackbar with the exception.
 925                         Snackbar.make(fileNameEditText, getString(R.string.export_failed) + "  " + exception, Snackbar.LENGTH_INDEFINITE).show();
 926                     }
 927                     break;
 928             }
 929         }
 930     }
 931
 932     private void restartPrivacyBrowser() {
 933         // Create an intent to restart Privacy Browser.
 934         Intent restartIntent = getParentActivityIntent();
 935
 936         // Assert that the intent is not null to remove the lint error below.
 937         assert restartIntent != null;
 938
 939         // `Intent.FLAG_ACTIVITY_CLEAR_TASK` removes all activities from the stack.  It requires `Intent.FLAG_ACTIVITY_NEW_TASK`.
 940         restartIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
 941
 942         // Create a restart handler.
 943         Handler restartHandler = new Handler();
 944
 945         // Create a restart runnable.
 946         Runnable restartRunnable =  () -> {
 947             // Restart Privacy Browser.
 948             startActivity(restartIntent);
 949
 950             // Kill this instance of Privacy Browser.  Otherwise, the app exhibits sporadic behavior after the restart.
 951             System.exit(0);
 952         };
 953
 954         // Restart Privacy Browser after 150 milliseconds to allow enough time for the preferences to be saved.
 955         restartHandler.postDelayed(restartRunnable, 150);
 956     }
 957 }