app/src/main/java/com/stoutner/privacybrowser/fragments/AboutTabFragment.java

   1 /*
   2  * Copyright © 2016-2019 Soren Stoutner <soren@stoutner.com>.
   3  *
   4  * This file is part of Privacy Browser <https://www.stoutner.com/privacy-browser>.
   5  *
   6  * Privacy Browser is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * Privacy Browser is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with Privacy Browser.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 package com.stoutner.privacybrowser.fragments;
  21
  22 import android.annotation.SuppressLint;
  23 import android.content.Context;
  24 import android.content.pm.PackageManager;
  25 import android.content.pm.Signature;
  26 import android.os.Build;
  27 import android.os.Bundle;
  28 import android.text.SpannableStringBuilder;
  29 import android.text.Spanned;
  30 import android.text.style.ForegroundColorSpan;
  31 import android.view.LayoutInflater;
  32 import android.view.View;
  33 import android.view.ViewGroup;
  34 import android.webkit.WebView;
  35 import android.widget.TextView;
  36
  37 import androidx.annotation.NonNull;
  38 import androidx.fragment.app.Fragment;
  39
  40 import com.stoutner.privacybrowser.BuildConfig;
  41 import com.stoutner.privacybrowser.R;
  42 import com.stoutner.privacybrowser.activities.MainWebViewActivity;
  43
  44 import java.io.ByteArrayInputStream;
  45 import java.io.InputStream;
  46 import java.math.BigInteger;
  47 import java.security.Principal;
  48 import java.security.cert.CertificateException;
  49 import java.security.cert.CertificateFactory;
  50 import java.security.cert.X509Certificate;
  51 import java.text.DateFormat;
  52 import java.util.Date;
  53
  54 public class AboutTabFragment extends Fragment {
  55     private int tabNumber;
  56
  57     // Store the tab number in the arguments bundle.
  58     public static AboutTabFragment createTab(int tab) {
  59         // Create a bundle.
  60         Bundle bundle = new Bundle();
  61
  62         // Store the tab number in the bundle.
  63         bundle.putInt("Tab", tab);
  64
  65         // Add the bundle to the fragment.
  66         AboutTabFragment aboutTabFragment = new AboutTabFragment();
  67         aboutTabFragment.setArguments(bundle);
  68
  69         // Return the new fragment.
  70         return aboutTabFragment;
  71     }
  72
  73     @Override
  74     public void onCreate(Bundle savedInstanceState) {
  75         // Run the default commands.
  76         super.onCreate(savedInstanceState);
  77
  78         // Remove the lint warning that `getArguments()` might be null.
  79         assert getArguments() != null;
  80
  81         // Store the tab number in a class variable.
  82         tabNumber = getArguments().getInt("Tab");
  83     }
  84
  85     @Override
  86     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
  87         // Create a tab layout view.
  88         View tabLayout;
  89
  90         // Get a handle for the context and assert that it isn't null.
  91         Context context = getContext();
  92         assert context != null;
  93
  94         // Load the tabs.  Tab numbers start at 0.
  95         if (tabNumber == 0) {  // Load the about tab.
  96             // Setting false at the end of inflater.inflate does not attach the inflated layout as a child of container.  The fragment will take care of attaching the root automatically.
  97             tabLayout = inflater.inflate(R.layout.about_tab_version, container, false);
  98
  99             // Get handles for the `TextViews`.
 100             TextView versionTextView = tabLayout.findViewById(R.id.version);
 101             TextView brandTextView = tabLayout.findViewById(R.id.brand);
 102             TextView manufacturerTextView = tabLayout.findViewById(R.id.manufacturer);
 103             TextView modelTextView = tabLayout.findViewById(R.id.model);
 104             TextView deviceTextView = tabLayout.findViewById(R.id.device);
 105             TextView bootloaderTextView = tabLayout.findViewById(R.id.bootloader);
 106             TextView radioTextView = tabLayout.findViewById(R.id.radio);
 107             TextView androidTextView = tabLayout.findViewById(R.id.android);
 108             TextView securityPatchTextView = tabLayout.findViewById(R.id.security_patch);
 109             TextView buildTextView = tabLayout.findViewById(R.id.build);
 110             TextView webViewTextView = tabLayout.findViewById(R.id.webview);
 111             TextView orbotTextView = tabLayout.findViewById(R.id.orbot);
 112             TextView openKeychainTextView = tabLayout.findViewById(R.id.open_keychain);
 113             TextView easyListTextView = tabLayout.findViewById(R.id.easylist);
 114             TextView easyPrivacyTextView = tabLayout.findViewById(R.id.easyprivacy);
 115             TextView fanboyAnnoyanceTextView = tabLayout.findViewById(R.id.fanboy_annoyance);
 116             TextView fanboySocialTextView = tabLayout.findViewById(R.id.fanboy_social);
 117             TextView ultraPrivacyTextView = tabLayout.findViewById(R.id.ultraprivacy);
 118             TextView certificateIssuerDNTextView = tabLayout.findViewById(R.id.certificate_issuer_dn);
 119             TextView certificateSubjectDNTextView = tabLayout.findViewById(R.id.certificate_subject_dn);
 120             TextView certificateStartDateTextView = tabLayout.findViewById(R.id.certificate_start_date);
 121             TextView certificateEndDateTextView = tabLayout.findViewById(R.id.certificate_end_date);
 122             TextView certificateVersionTextView = tabLayout.findViewById(R.id.certificate_version);
 123             TextView certificateSerialNumberTextView = tabLayout.findViewById(R.id.certificate_serial_number);
 124             TextView certificateSignatureAlgorithmTextView = tabLayout.findViewById(R.id.certificate_signature_algorithm);
 125
 126             // Setup the labels.
 127             String version = getString(R.string.version) + " " + BuildConfig.VERSION_NAME + " (" + getString(R.string.version_code) + " " + Integer.toString(BuildConfig.VERSION_CODE) + ")";
 128             String brandLabel = getString(R.string.brand) + "  ";
 129             String manufacturerLabel = getString(R.string.manufacturer) + "  ";
 130             String modelLabel = getString(R.string.model) + "  ";
 131             String deviceLabel = getString(R.string.device) + "  ";
 132             String bootloaderLabel = getString(R.string.bootloader) + "  ";
 133             String androidLabel = getString(R.string.android) + "  ";
 134             String buildLabel = getString(R.string.build) + "  ";
 135             String webViewLabel = getString(R.string.webview) + "  ";
 136             String easyListLabel = getString(R.string.easylist_label) + "  ";
 137             String easyPrivacyLabel = getString(R.string.easyprivacy_label) + "  ";
 138             String fanboyAnnoyanceLabel = getString(R.string.fanboy_annoyance_label) + "  ";
 139             String fanboySocialLabel = getString(R.string.fanboy_social_label) + "  ";
 140             String ultraPrivacyLabel = getString(R.string.ultraprivacy_label) + "  ";
 141             String issuerDNLabel = getString(R.string.issuer_dn) + "  ";
 142             String subjectDNLabel = getString(R.string.subject_dn) + "  ";
 143             String startDateLabel = getString(R.string.start_date) + "  ";
 144             String endDateLabel = getString(R.string.end_date) + "  ";
 145             String certificateVersionLabel = getString(R.string.certificate_version) + "  ";
 146             String serialNumberLabel = getString(R.string.serial_number) + "  ";
 147             String signatureAlgorithmLabel = getString(R.string.signature_algorithm) + "  ";
 148
 149             // `webViewLayout` is only used to get the default user agent from `bare_webview`.  It is not used to render content on the screen.
 150             View webViewLayout = inflater.inflate(R.layout.bare_webview, container, false);
 151             WebView tabLayoutWebView = webViewLayout.findViewById(R.id.bare_webview);
 152             String userAgentString =  tabLayoutWebView.getSettings().getUserAgentString();
 153
 154             // Get the device's information and store it in strings.
 155             String brand = Build.BRAND;
 156             String manufacturer = Build.MANUFACTURER;
 157             String model = Build.MODEL;
 158             String device = Build.DEVICE;
 159             String bootloader = Build.BOOTLOADER;
 160             String radio = Build.getRadioVersion();
 161             String android = Build.VERSION.RELEASE + " (" + getString(R.string.api) + " " + Integer.toString(Build.VERSION.SDK_INT) + ")";
 162             String build = Build.DISPLAY;
 163             // Select the substring that begins after `Chrome/` and goes until the next ` `.
 164             String webView = userAgentString.substring(userAgentString.indexOf("Chrome/") + 7, userAgentString.indexOf(" ", userAgentString.indexOf("Chrome/")));
 165
 166             // Get the Orbot version name if Orbot is installed.
 167             String orbot;
 168             try {
 169                 // Store the version name.
 170                 orbot = context.getPackageManager().getPackageInfo("org.torproject.android", 0).versionName;
 171             } catch (PackageManager.NameNotFoundException exception) {  // Orbot is not installed.
 172                 orbot = "";
 173             }
 174
 175             // Get the OpenKeychain version name if it is installed.
 176             String openKeychain;
 177             try {
 178                 // Store the version name.
 179                 openKeychain = context.getPackageManager().getPackageInfo("org.sufficientlysecure.keychain", 0).versionName;
 180             } catch (PackageManager.NameNotFoundException exception) {  // OpenKeychain is not installed.
 181                 openKeychain = "";
 182             }
 183
 184             // Create a `SpannableStringBuilder` for the hardware and software `TextViews` that needs multiple colors of text.
 185             SpannableStringBuilder brandStringBuilder = new SpannableStringBuilder(brandLabel + brand);
 186             SpannableStringBuilder manufacturerStringBuilder = new SpannableStringBuilder(manufacturerLabel + manufacturer);
 187             SpannableStringBuilder modelStringBuilder = new SpannableStringBuilder(modelLabel + model);
 188             SpannableStringBuilder deviceStringBuilder = new SpannableStringBuilder(deviceLabel + device);
 189             SpannableStringBuilder bootloaderStringBuilder = new SpannableStringBuilder(bootloaderLabel + bootloader);
 190             SpannableStringBuilder androidStringBuilder = new SpannableStringBuilder(androidLabel + android);
 191             SpannableStringBuilder buildStringBuilder = new SpannableStringBuilder(buildLabel + build);
 192             SpannableStringBuilder webViewStringBuilder = new SpannableStringBuilder(webViewLabel + webView);
 193             SpannableStringBuilder easyListStringBuilder = new SpannableStringBuilder(easyListLabel + MainWebViewActivity.easyListVersion);
 194             SpannableStringBuilder easyPrivacyStringBuilder = new SpannableStringBuilder(easyPrivacyLabel + MainWebViewActivity.easyPrivacyVersion);
 195             SpannableStringBuilder fanboyAnnoyanceStringBuilder = new SpannableStringBuilder(fanboyAnnoyanceLabel + MainWebViewActivity.fanboysAnnoyanceVersion);
 196             SpannableStringBuilder fanboySocialStringBuilder = new SpannableStringBuilder(fanboySocialLabel + MainWebViewActivity.fanboysSocialVersion);
 197             SpannableStringBuilder ultraPrivacyStringBuilder = new SpannableStringBuilder(ultraPrivacyLabel + MainWebViewActivity.ultraPrivacyVersion);
 198
 199             // Create the `blueColorSpan` variable.
 200             ForegroundColorSpan blueColorSpan;
 201
 202             // Set `blueColorSpan` according to the theme.  We have to use the deprecated `getColor()` until API >= 23.
 203             if (MainWebViewActivity.darkTheme) {
 204                 //noinspection deprecation
 205                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_400));
 206             } else {
 207                 //noinspection deprecation
 208                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_700));
 209             }
 210
 211             // Setup the spans to display the device information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 212             brandStringBuilder.setSpan(blueColorSpan, brandLabel.length(), brandStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 213             manufacturerStringBuilder.setSpan(blueColorSpan, manufacturerLabel.length(), manufacturerStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 214             modelStringBuilder.setSpan(blueColorSpan, modelLabel.length(), modelStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 215             deviceStringBuilder.setSpan(blueColorSpan, deviceLabel.length(), deviceStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 216             bootloaderStringBuilder.setSpan(blueColorSpan, bootloaderLabel.length(), bootloaderStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 217             androidStringBuilder.setSpan(blueColorSpan, androidLabel.length(), androidStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 218             buildStringBuilder.setSpan(blueColorSpan, buildLabel.length(), buildStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 219             webViewStringBuilder.setSpan(blueColorSpan, webViewLabel.length(), webViewStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 220             easyListStringBuilder.setSpan(blueColorSpan, easyListLabel.length(), easyListStringBuilder.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
 221             easyPrivacyStringBuilder.setSpan(blueColorSpan, easyPrivacyLabel.length(), easyPrivacyStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 222             fanboyAnnoyanceStringBuilder.setSpan(blueColorSpan, fanboyAnnoyanceLabel.length(), fanboyAnnoyanceStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 223             fanboySocialStringBuilder.setSpan(blueColorSpan, fanboySocialLabel.length(), fanboySocialStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 224             ultraPrivacyStringBuilder.setSpan(blueColorSpan, ultraPrivacyLabel.length(), ultraPrivacyStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 225
 226             // Display the strings in the text boxes.
 227             versionTextView.setText(version);
 228             brandTextView.setText(brandStringBuilder);
 229             manufacturerTextView.setText(manufacturerStringBuilder);
 230             modelTextView.setText(modelStringBuilder);
 231             deviceTextView.setText(deviceStringBuilder);
 232             bootloaderTextView.setText(bootloaderStringBuilder);
 233             androidTextView.setText(androidStringBuilder);
 234             buildTextView.setText(buildStringBuilder);
 235             webViewTextView.setText(webViewStringBuilder);
 236             easyListTextView.setText(easyListStringBuilder);
 237             easyPrivacyTextView.setText(easyPrivacyStringBuilder);
 238             fanboyAnnoyanceTextView.setText(fanboyAnnoyanceStringBuilder);
 239             fanboySocialTextView.setText(fanboySocialStringBuilder);
 240             ultraPrivacyTextView.setText(ultraPrivacyStringBuilder);
 241
 242             // Build.VERSION.SECURITY_PATCH is only available for SDK_INT >= 23.
 243             if (Build.VERSION.SDK_INT >= 23) {
 244                 String securityPatchLabel = getString(R.string.security_patch) + "  ";
 245                 String securityPatch = Build.VERSION.SECURITY_PATCH;
 246                 SpannableStringBuilder securityPatchStringBuilder = new SpannableStringBuilder(securityPatchLabel + securityPatch);
 247                 securityPatchStringBuilder.setSpan(blueColorSpan, securityPatchLabel.length(), securityPatchStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 248                 securityPatchTextView.setText(securityPatchStringBuilder);
 249             } else {  // SDK_INT < 23.
 250                 securityPatchTextView.setVisibility(View.GONE);
 251             }
 252
 253             // Only populate the radio text view if there is a radio in the device.
 254             if (!radio.isEmpty()) {
 255                 String radioLabel = getString(R.string.radio) + "  ";
 256                 SpannableStringBuilder radioStringBuilder = new SpannableStringBuilder(radioLabel + radio);
 257                 radioStringBuilder.setSpan(blueColorSpan, radioLabel.length(), radioStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 258                 radioTextView.setText(radioStringBuilder);
 259             } else {  // This device does not have a radio.
 260                 radioTextView.setVisibility(View.GONE);
 261             }
 262
 263             // Only populate the Orbot text view if it is installed.
 264             if (!orbot.isEmpty()) {
 265                 String orbotLabel = getString(R.string.orbot) + "  ";
 266                 SpannableStringBuilder orbotStringBuilder = new SpannableStringBuilder(orbotLabel + orbot);
 267                 orbotStringBuilder.setSpan(blueColorSpan, orbotLabel.length(), orbotStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 268                 orbotTextView.setText(orbotStringBuilder);
 269             } else {  // Orbot is not installed.
 270                 orbotTextView.setVisibility(View.GONE);
 271             }
 272
 273             // Only populate the OpenKeychain text view if it is installed.
 274             if (!openKeychain.isEmpty()) {
 275                 String openKeychainLabel = getString(R.string.openkeychain) + "  ";
 276                 SpannableStringBuilder openKeychainStringBuilder = new SpannableStringBuilder(openKeychainLabel + openKeychain);
 277                 openKeychainStringBuilder.setSpan(blueColorSpan, openKeychainLabel.length(), openKeychainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 278                 openKeychainTextView.setText(openKeychainStringBuilder);
 279             } else {  //OpenKeychain is not installed.
 280                 openKeychainTextView.setVisibility(View.GONE);
 281             }
 282
 283             // Display the package signature.
 284             try {
 285                 // Get the first package signature.  Suppress the lint warning about the need to be careful in implementing comparison of certificates for security purposes.
 286                 @SuppressLint("PackageManagerGetSignatures") Signature packageSignature = getContext().getPackageManager().getPackageInfo(getContext().getPackageName(), PackageManager.GET_SIGNATURES).signatures[0];
 287
 288                 // Convert the signature to a `byte[]` `InputStream`.
 289                 InputStream certificateByteArrayInputStream = new ByteArrayInputStream(packageSignature.toByteArray());
 290
 291                 // Display the certificate information on the screen.
 292                 try {
 293                     // Instantiate a `CertificateFactory`.
 294                     CertificateFactory certificateFactory = CertificateFactory.getInstance("X509");
 295
 296                     // Generate an `X509Certificate`.
 297                     X509Certificate x509Certificate = (X509Certificate) certificateFactory.generateCertificate(certificateByteArrayInputStream);
 298
 299                     // Store the individual sections of the certificate that we are interested in.
 300                     Principal issuerDNPrincipal = x509Certificate.getIssuerDN();
 301                     Principal subjectDNPrincipal = x509Certificate.getSubjectDN();
 302                     Date startDate = x509Certificate.getNotBefore();
 303                     Date endDate = x509Certificate.getNotAfter();
 304                     int certificateVersion = x509Certificate.getVersion();
 305                     BigInteger serialNumberBigInteger = x509Certificate.getSerialNumber();
 306                     String signatureAlgorithmNameString = x509Certificate.getSigAlgName();
 307
 308                     // Create a `SpannableStringBuilder` for each `TextView` that needs multiple colors of text.
 309                     SpannableStringBuilder issuerDNStringBuilder = new SpannableStringBuilder(issuerDNLabel + issuerDNPrincipal.toString());
 310                     SpannableStringBuilder subjectDNStringBuilder = new SpannableStringBuilder(subjectDNLabel + subjectDNPrincipal.toString());
 311                     SpannableStringBuilder startDateStringBuilder = new SpannableStringBuilder(startDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(startDate));
 312                     SpannableStringBuilder endDataStringBuilder = new SpannableStringBuilder(endDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(endDate));
 313                     SpannableStringBuilder certificateVersionStringBuilder = new SpannableStringBuilder(certificateVersionLabel + certificateVersion);
 314                     SpannableStringBuilder serialNumberStringBuilder = new SpannableStringBuilder(serialNumberLabel + serialNumberBigInteger);
 315                     SpannableStringBuilder signatureAlgorithmStringBuilder = new SpannableStringBuilder(signatureAlgorithmLabel + signatureAlgorithmNameString);
 316
 317                     // Setup the spans to display the device information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 318                     issuerDNStringBuilder.setSpan(blueColorSpan, issuerDNLabel.length(), issuerDNStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 319                     subjectDNStringBuilder.setSpan(blueColorSpan, subjectDNLabel.length(), subjectDNStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 320                     startDateStringBuilder.setSpan(blueColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 321                     endDataStringBuilder.setSpan(blueColorSpan, endDateLabel.length(), endDataStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 322                     certificateVersionStringBuilder.setSpan(blueColorSpan, certificateVersionLabel.length(), certificateVersionStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 323                     serialNumberStringBuilder.setSpan(blueColorSpan, serialNumberLabel.length(), serialNumberStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 324                     signatureAlgorithmStringBuilder.setSpan(blueColorSpan, signatureAlgorithmLabel.length(), signatureAlgorithmStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 325
 326                     // Display the strings in the text boxes.
 327                     certificateIssuerDNTextView.setText(issuerDNStringBuilder);
 328                     certificateSubjectDNTextView.setText(subjectDNStringBuilder);
 329                     certificateStartDateTextView.setText(startDateStringBuilder);
 330                     certificateEndDateTextView.setText(endDataStringBuilder);
 331                     certificateVersionTextView.setText(certificateVersionStringBuilder);
 332                     certificateSerialNumberTextView.setText(serialNumberStringBuilder);
 333                     certificateSignatureAlgorithmTextView.setText(signatureAlgorithmStringBuilder);
 334                 } catch (CertificateException e) {
 335                     // Do nothing if there is a certificate error.
 336                 }
 337             } catch (PackageManager.NameNotFoundException e) {
 338                 // Do nothing if `PackageManager` says Privacy Browser isn't installed.
 339             }
 340         } else { // load a `WebView` for all the other tabs.  Tab numbers start at 0.
 341             // Setting false at the end of inflater.inflate does not attach the inflated layout as a child of container.  The fragment will take care of attaching the root automatically.
 342             tabLayout = inflater.inflate(R.layout.bare_webview, container, false);
 343
 344             // Get a handle for `tabWebView`.
 345             WebView tabWebView = (WebView) tabLayout;
 346
 347             // Load the tabs according to the theme.
 348             if (MainWebViewActivity.darkTheme) {  // The dark theme is applied.
 349                 // Set the background color.  We have to use the deprecated `.getColor()` until API >= 23.
 350                 //noinspection deprecation
 351                 tabWebView.setBackgroundColor(getResources().getColor(R.color.gray_850));
 352
 353                 switch (tabNumber) {
 354                     case 1:
 355                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_permissions_dark.html");
 356                         break;
 357
 358                     case 2:
 359                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_privacy_policy_dark.html");
 360                         break;
 361
 362                     case 3:
 363                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_changelog_dark.html");
 364                         break;
 365
 366                     case 4:
 367                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_licenses_dark.html");
 368                         break;
 369
 370                     case 5:
 371                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_contributors_dark.html");
 372                         break;
 373
 374                     case 6:
 375                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_links_dark.html");
 376                         break;
 377                 }
 378             } else {  // The light theme is applied.
 379                 switch (tabNumber) {
 380                     case 1:
 381                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_permissions_light.html");
 382                         break;
 383
 384                     case 2:
 385                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_privacy_policy_light.html");
 386                         break;
 387
 388                     case 3:
 389                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_changelog_light.html");
 390                         break;
 391
 392                     case 4:
 393                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_licenses_light.html");
 394                         break;
 395
 396                     case 5:
 397                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_contributors_light.html");
 398                         break;
 399
 400                     case 6:
 401                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_links_light.html");
 402                         break;
 403                 }
 404             }
 405         }
 406
 407         // Return the formatted `tabLayout`.
 408         return tabLayout;
 409     }
 410 }