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

   1 /*
   2  * Copyright © 2016-2018 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.pm.PackageManager;
  24 import android.content.pm.Signature;
  25 import android.os.Build;
  26 import android.os.Bundle;
  27 import android.support.annotation.NonNull;
  28 import android.support.v4.app.Fragment;
  29 import android.text.SpannableStringBuilder;
  30 import android.text.Spanned;
  31 import android.text.style.ForegroundColorSpan;
  32 import android.view.LayoutInflater;
  33 import android.view.View;
  34 import android.view.ViewGroup;
  35 import android.webkit.WebView;
  36 import android.widget.TextView;
  37
  38 import com.stoutner.privacybrowser.BuildConfig;
  39 import com.stoutner.privacybrowser.R;
  40 import com.stoutner.privacybrowser.activities.MainWebViewActivity;
  41
  42 import java.io.ByteArrayInputStream;
  43 import java.io.InputStream;
  44 import java.math.BigInteger;
  45 import java.security.Principal;
  46 import java.security.cert.CertificateException;
  47 import java.security.cert.CertificateFactory;
  48 import java.security.cert.X509Certificate;
  49 import java.text.DateFormat;
  50 import java.util.Date;
  51
  52 public class AboutTabFragment extends Fragment {
  53     private int tabNumber;
  54
  55     // Store the tab number in the arguments bundle.
  56     public static AboutTabFragment createTab(int tab) {
  57         // Create a bundle.
  58         Bundle bundle = new Bundle();
  59
  60         // Store the tab number in the bundle.
  61         bundle.putInt("Tab", tab);
  62
  63         // Add the bundle to the fragment.
  64         AboutTabFragment aboutTabFragment = new AboutTabFragment();
  65         aboutTabFragment.setArguments(bundle);
  66
  67         // Return the new fragment.
  68         return aboutTabFragment;
  69     }
  70
  71     @Override
  72     public void onCreate(Bundle savedInstanceState) {
  73         // Run the default commands.
  74         super.onCreate(savedInstanceState);
  75
  76         // Remove the lint warning that `getArguments()` might be null.
  77         assert getArguments() != null;
  78
  79         // Store the tab number in a class variable.
  80         tabNumber = getArguments().getInt("Tab");
  81     }
  82
  83     @Override
  84     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
  85         View tabLayout;
  86
  87         // Load the tabs.  Tab numbers start at 0.
  88         if (tabNumber == 0) {  // Load the about tab.
  89             // 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.
  90             tabLayout = inflater.inflate(R.layout.about_tab_version, container, false);
  91
  92             // Get handles for the `TextViews`.
  93             TextView versionNumberTextView = tabLayout.findViewById(R.id.about_version_number);
  94             TextView versionBrandTextView = tabLayout.findViewById(R.id.about_version_brand);
  95             TextView versionManufacturerTextView = tabLayout.findViewById(R.id.about_version_manufacturer);
  96             TextView versionModelTextView = tabLayout.findViewById(R.id.about_version_model);
  97             TextView versionDeviceTextView = tabLayout.findViewById(R.id.about_version_device);
  98             TextView versionBootloaderTextView = tabLayout.findViewById(R.id.about_version_bootloader);
  99             TextView versionRadioTextView = tabLayout.findViewById(R.id.about_version_radio);
 100             TextView versionAndroidTextView = tabLayout.findViewById(R.id.about_version_android);
 101             TextView versionSecurityPatchTextView = tabLayout.findViewById(R.id.about_version_securitypatch);
 102             TextView versionBuildTextView = tabLayout.findViewById(R.id.about_version_build);
 103             TextView versionChromeTextView = tabLayout.findViewById(R.id.about_version_chrome);
 104             TextView versionOrbotTextView = tabLayout.findViewById(R.id.about_version_orbot);
 105             TextView versionEasyListTextView = tabLayout.findViewById(R.id.about_version_easylist);
 106             TextView versionEasyPrivacyTextView = tabLayout.findViewById(R.id.about_version_easyprivacy);
 107             TextView versionFanboyAnnoyanceTextView = tabLayout.findViewById(R.id.about_version_fanboy_annoyance);
 108             TextView versionFanboySocialTextView = tabLayout.findViewById(R.id.about_version_fanboy_social);
 109             TextView versionUltraPrivacyTextView = tabLayout.findViewById(R.id.about_version_ultraprivacy);
 110             TextView certificateIssuerDNTextView = tabLayout.findViewById(R.id.about_version_certificate_issuer_dn);
 111             TextView certificateSubjectDNTextView = tabLayout.findViewById(R.id.about_version_certificate_subject_dn);
 112             TextView certificateStartDateTextView = tabLayout.findViewById(R.id.about_version_certificate_start_date);
 113             TextView certificateEndDateTextView = tabLayout.findViewById(R.id.about_version_certificate_end_date);
 114             TextView certificateVersionTextView = tabLayout.findViewById(R.id.about_version_certificate_version);
 115             TextView certificateSerialNumberTextView = tabLayout.findViewById(R.id.about_version_certificate_serial_number);
 116             TextView certificateSignatureAlgorithmTextView = tabLayout.findViewById(R.id.about_version_certificate_signature_algorithm);
 117
 118             // Setup the labels.
 119             String version = getString(R.string.version) + " " + BuildConfig.VERSION_NAME + " (" + getString(R.string.version_code) + " " + Integer.toString(BuildConfig.VERSION_CODE) + ")";
 120             String brandLabel = getString(R.string.brand) + "  ";
 121             String manufacturerLabel = getString(R.string.manufacturer) + "  ";
 122             String modelLabel = getString(R.string.model) + "  ";
 123             String deviceLabel = getString(R.string.device) + "  ";
 124             String bootloaderLabel = getString(R.string.bootloader) + "  ";
 125             String androidLabel = getString(R.string.android) + "  ";
 126             String buildLabel = getString(R.string.build) + "  ";
 127             String chromeLabel = getString(R.string.chrome) + "  ";
 128             String easyListLabel = getString(R.string.easylist_label) + "  ";
 129             String easyPrivacyLabel = getString(R.string.easyprivacy_label) + "  ";
 130             String fanboyAnnoyanceLabel = getString(R.string.fanboy_annoyance_label) + "  ";
 131             String fanboySocialLabel = getString(R.string.fanboy_social_label) + "  ";
 132             String ultraPrivacyLabel = getString(R.string.ultraprivacy_label) + "  ";
 133             String issuerDNLabel = getString(R.string.issuer_dn) + "  ";
 134             String subjectDNLabel = getString(R.string.subject_dn) + "  ";
 135             String startDateLabel = getString(R.string.start_date) + "  ";
 136             String endDateLabel = getString(R.string.end_date) + "  ";
 137             String certificateVersionLabel = getString(R.string.certificate_version) + "  ";
 138             String serialNumberLabel = getString(R.string.serial_number) + "  ";
 139             String signatureAlgorithmLabel = getString(R.string.signature_algorithm) + "  ";
 140
 141             // `webViewLayout` is only used to get the default user agent from `bare_webview`.  It is not used to render content on the screen.
 142             View webViewLayout = inflater.inflate(R.layout.bare_webview, container, false);
 143             WebView tabLayoutWebView = webViewLayout.findViewById(R.id.bare_webview);
 144             String userAgentString =  tabLayoutWebView.getSettings().getUserAgentString();
 145
 146             // Get the device's information and store it in strings.
 147             String brand = Build.BRAND;
 148             String manufacturer = Build.MANUFACTURER;
 149             String model = Build.MODEL;
 150             String device = Build.DEVICE;
 151             String bootloader = Build.BOOTLOADER;
 152             String radio = Build.getRadioVersion();
 153             String android = Build.VERSION.RELEASE + " (" + getString(R.string.api) + " " + Integer.toString(Build.VERSION.SDK_INT) + ")";
 154             String build = Build.DISPLAY;
 155             // Select the substring that begins after `Chrome/` and goes until the next ` `.
 156             String chrome = userAgentString.substring(userAgentString.indexOf("Chrome/") + 7, userAgentString.indexOf(" ", userAgentString.indexOf("Chrome/")));
 157
 158             // Get the Orbot version name if Orbot is installed.
 159             String orbot;
 160             try {
 161                 // Remove the lint warning that `getContext()` might be null.
 162                 assert getContext() != null;
 163
 164                 // Store the version name.
 165                 orbot = getContext().getPackageManager().getPackageInfo("org.torproject.android", PackageManager.GET_CONFIGURATIONS).versionName;
 166             } catch (PackageManager.NameNotFoundException e) {  // Orbot is not installed.
 167                 orbot = "";
 168             }
 169
 170             // Create a `SpannableStringBuilder` for the hardware and software `TextViews` that needs multiple colors of text.
 171             SpannableStringBuilder brandStringBuilder = new SpannableStringBuilder(brandLabel + brand);
 172             SpannableStringBuilder manufacturerStringBuilder = new SpannableStringBuilder(manufacturerLabel + manufacturer);
 173             SpannableStringBuilder modelStringBuilder = new SpannableStringBuilder(modelLabel + model);
 174             SpannableStringBuilder deviceStringBuilder = new SpannableStringBuilder(deviceLabel + device);
 175             SpannableStringBuilder bootloaderStringBuilder = new SpannableStringBuilder(bootloaderLabel + bootloader);
 176             SpannableStringBuilder androidStringBuilder = new SpannableStringBuilder(androidLabel + android);
 177             SpannableStringBuilder buildStringBuilder = new SpannableStringBuilder(buildLabel + build);
 178             SpannableStringBuilder chromeStringBuilder = new SpannableStringBuilder(chromeLabel + chrome);
 179             SpannableStringBuilder easyListStringBuilder = new SpannableStringBuilder(easyListLabel + MainWebViewActivity.easyListVersion);
 180             SpannableStringBuilder easyPrivacyStringBuilder = new SpannableStringBuilder(easyPrivacyLabel + MainWebViewActivity.easyPrivacyVersion);
 181             SpannableStringBuilder fanboyAnnoyanceStringBuilder = new SpannableStringBuilder(fanboyAnnoyanceLabel + MainWebViewActivity.fanboysAnnoyanceVersion);
 182             SpannableStringBuilder fanboySocialStringBuilder = new SpannableStringBuilder(fanboySocialLabel + MainWebViewActivity.fanboysSocialVersion);
 183             SpannableStringBuilder ultraPrivacyStringBuilder = new SpannableStringBuilder(ultraPrivacyLabel + MainWebViewActivity.ultraPrivacyVersion);
 184
 185             // Create the `blueColorSpan` variable.
 186             ForegroundColorSpan blueColorSpan;
 187
 188             // Set `blueColorSpan` according to the theme.  We have to use the deprecated `getColor()` until API >= 23.
 189             if (MainWebViewActivity.darkTheme) {
 190                 //noinspection deprecation
 191                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_400));
 192             } else {
 193                 //noinspection deprecation
 194                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_700));
 195             }
 196
 197             // Setup the spans to display the device information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 198             brandStringBuilder.setSpan(blueColorSpan, brandLabel.length(), brandStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 199             manufacturerStringBuilder.setSpan(blueColorSpan, manufacturerLabel.length(), manufacturerStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 200             modelStringBuilder.setSpan(blueColorSpan, modelLabel.length(), modelStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 201             deviceStringBuilder.setSpan(blueColorSpan, deviceLabel.length(), deviceStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 202             bootloaderStringBuilder.setSpan(blueColorSpan, bootloaderLabel.length(), bootloaderStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 203             androidStringBuilder.setSpan(blueColorSpan, androidLabel.length(), androidStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 204             buildStringBuilder.setSpan(blueColorSpan, buildLabel.length(), buildStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 205             chromeStringBuilder.setSpan(blueColorSpan, chromeLabel.length(), chromeStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 206             easyListStringBuilder.setSpan(blueColorSpan, easyListLabel.length(), easyListStringBuilder.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
 207             easyPrivacyStringBuilder.setSpan(blueColorSpan, easyPrivacyLabel.length(), easyPrivacyStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 208             fanboyAnnoyanceStringBuilder.setSpan(blueColorSpan, fanboyAnnoyanceLabel.length(), fanboyAnnoyanceStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 209             fanboySocialStringBuilder.setSpan(blueColorSpan, fanboySocialLabel.length(), fanboySocialStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 210             ultraPrivacyStringBuilder.setSpan(blueColorSpan, ultraPrivacyLabel.length(), ultraPrivacyStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 211
 212             // Display the strings in the text boxes.
 213             versionNumberTextView.setText(version);
 214             versionBrandTextView.setText(brandStringBuilder);
 215             versionManufacturerTextView.setText(manufacturerStringBuilder);
 216             versionModelTextView.setText(modelStringBuilder);
 217             versionDeviceTextView.setText(deviceStringBuilder);
 218             versionBootloaderTextView.setText(bootloaderStringBuilder);
 219             versionAndroidTextView.setText(androidStringBuilder);
 220             versionBuildTextView.setText(buildStringBuilder);
 221             versionChromeTextView.setText(chromeStringBuilder);
 222             versionEasyListTextView.setText(easyListStringBuilder);
 223             versionEasyPrivacyTextView.setText(easyPrivacyStringBuilder);
 224             versionFanboyAnnoyanceTextView.setText(fanboyAnnoyanceStringBuilder);
 225             versionFanboySocialTextView.setText(fanboySocialStringBuilder);
 226             versionUltraPrivacyTextView.setText(ultraPrivacyStringBuilder);
 227
 228             // Build.VERSION.SECURITY_PATCH is only available for SDK_INT >= 23.
 229             if (Build.VERSION.SDK_INT >= 23) {
 230                 String securityPatchLabel = getString(R.string.security_patch) + "  ";
 231                 String securityPatch = Build.VERSION.SECURITY_PATCH;
 232                 SpannableStringBuilder securityPatchStringBuilder = new SpannableStringBuilder(securityPatchLabel + securityPatch);
 233                 securityPatchStringBuilder.setSpan(blueColorSpan, securityPatchLabel.length(), securityPatchStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 234                 versionSecurityPatchTextView.setText(securityPatchStringBuilder);
 235             } else {  // SDK_INT < 23, so `versionSecurityPatchTextView` should be hidden.
 236                 versionSecurityPatchTextView.setVisibility(View.GONE);
 237             }
 238
 239             // Only populate `versionRadioTextView` if there is a radio in the device.
 240             if (!radio.equals("")) {
 241                 String radioLabel = getString(R.string.radio) + "  ";
 242                 SpannableStringBuilder radioStringBuilder = new SpannableStringBuilder(radioLabel + radio);
 243                 radioStringBuilder.setSpan(blueColorSpan, radioLabel.length(), radioStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 244                 versionRadioTextView.setText(radioStringBuilder);
 245             } else {  // This device does not have a radio, so `versionRadioTextView` should be hidden.
 246                 versionRadioTextView.setVisibility(View.GONE);
 247             }
 248
 249             // Only populate `versionOrbotTextView` if Orbot is installed.
 250             if (!orbot.equals("")) {
 251                 String orbotLabel = getString(R.string.orbot) + "  ";
 252                 SpannableStringBuilder orbotStringBuilder = new SpannableStringBuilder(orbotLabel + orbot);
 253                 orbotStringBuilder.setSpan(blueColorSpan, orbotLabel.length(), orbotStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 254                 versionOrbotTextView.setText(orbotStringBuilder);
 255             } else {  // Orbot is not installed, so the `versionOrbotTextView` should be hidden.
 256                 versionOrbotTextView.setVisibility(View.GONE);
 257             }
 258
 259             // Display the package signature.
 260             try {
 261                 // Get the first package signature.  Suppress the lint warning about the need to be careful in implementing comparison of certificates for security purposes.
 262                 @SuppressLint("PackageManagerGetSignatures") Signature packageSignature = getContext().getPackageManager().getPackageInfo(getContext().getPackageName(), PackageManager.GET_SIGNATURES).signatures[0];
 263
 264                 // Convert the signature to a `byte[]` `InputStream`.
 265                 InputStream certificateByteArrayInputStream = new ByteArrayInputStream(packageSignature.toByteArray());
 266
 267                 // Display the certificate information on the screen.
 268                 try {
 269                     // Instantiate a `CertificateFactory`.
 270                     CertificateFactory certificateFactory = CertificateFactory.getInstance("X509");
 271
 272                     // Generate an `X509Certificate`.
 273                     X509Certificate x509Certificate = (X509Certificate) certificateFactory.generateCertificate(certificateByteArrayInputStream);
 274
 275                     // Store the individual sections of the certificate that we are interested in.
 276                     Principal issuerDNPrincipal = x509Certificate.getIssuerDN();
 277                     Principal subjectDNPrincipal = x509Certificate.getSubjectDN();
 278                     Date startDate = x509Certificate.getNotBefore();
 279                     Date endDate = x509Certificate.getNotAfter();
 280                     int certificateVersion = x509Certificate.getVersion();
 281                     BigInteger serialNumberBigInteger = x509Certificate.getSerialNumber();
 282                     String signatureAlgorithmNameString = x509Certificate.getSigAlgName();
 283
 284                     // Create a `SpannableStringBuilder` for each `TextView` that needs multiple colors of text.
 285                     SpannableStringBuilder issuerDNStringBuilder = new SpannableStringBuilder(issuerDNLabel + issuerDNPrincipal.toString());
 286                     SpannableStringBuilder subjectDNStringBuilder = new SpannableStringBuilder(subjectDNLabel + subjectDNPrincipal.toString());
 287                     SpannableStringBuilder startDateStringBuilder = new SpannableStringBuilder(startDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(startDate));
 288                     SpannableStringBuilder endDataStringBuilder = new SpannableStringBuilder(endDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(endDate));
 289                     SpannableStringBuilder certificateVersionStringBuilder = new SpannableStringBuilder(certificateVersionLabel + certificateVersion);
 290                     SpannableStringBuilder serialNumberStringBuilder = new SpannableStringBuilder(serialNumberLabel + serialNumberBigInteger);
 291                     SpannableStringBuilder signatureAlgorithmStringBuilder = new SpannableStringBuilder(signatureAlgorithmLabel + signatureAlgorithmNameString);
 292
 293                     // Setup the spans to display the device information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 294                     issuerDNStringBuilder.setSpan(blueColorSpan, issuerDNLabel.length(), issuerDNStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 295                     subjectDNStringBuilder.setSpan(blueColorSpan, subjectDNLabel.length(), subjectDNStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 296                     startDateStringBuilder.setSpan(blueColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 297                     endDataStringBuilder.setSpan(blueColorSpan, endDateLabel.length(), endDataStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 298                     certificateVersionStringBuilder.setSpan(blueColorSpan, certificateVersionLabel.length(), certificateVersionStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 299                     serialNumberStringBuilder.setSpan(blueColorSpan, serialNumberLabel.length(), serialNumberStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 300                     signatureAlgorithmStringBuilder.setSpan(blueColorSpan, signatureAlgorithmLabel.length(), signatureAlgorithmStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 301
 302                     // Display the strings in the text boxes.
 303                     certificateIssuerDNTextView.setText(issuerDNStringBuilder);
 304                     certificateSubjectDNTextView.setText(subjectDNStringBuilder);
 305                     certificateStartDateTextView.setText(startDateStringBuilder);
 306                     certificateEndDateTextView.setText(endDataStringBuilder);
 307                     certificateVersionTextView.setText(certificateVersionStringBuilder);
 308                     certificateSerialNumberTextView.setText(serialNumberStringBuilder);
 309                     certificateSignatureAlgorithmTextView.setText(signatureAlgorithmStringBuilder);
 310                 } catch (CertificateException e) {
 311                     // Do nothing if there is a certificate error.
 312                 }
 313             } catch (PackageManager.NameNotFoundException e) {
 314                 // Do nothing if `PackageManager` says Privacy Browser isn't installed.
 315             }
 316         } else { // load a `WebView` for all the other tabs.  Tab numbers start at 0.
 317             // 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.
 318             tabLayout = inflater.inflate(R.layout.bare_webview, container, false);
 319
 320             // Get a handle for `tabWebView`.
 321             WebView tabWebView = (WebView) tabLayout;
 322
 323             // Load the tabs according to the theme.
 324             if (MainWebViewActivity.darkTheme) {  // The dark theme is applied.
 325                 // Set the background color.  We have to use the deprecated `.getColor()` until API >= 23.
 326                 //noinspection deprecation
 327                 tabWebView.setBackgroundColor(getResources().getColor(R.color.gray_850));
 328
 329                 switch (tabNumber) {
 330                     case 1:
 331                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_permissions_dark.html");
 332                         break;
 333
 334                     case 2:
 335                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_privacy_policy_dark.html");
 336                         break;
 337
 338                     case 3:
 339                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_changelog_dark.html");
 340                         break;
 341
 342                     case 4:
 343                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_licenses_dark.html");
 344                         break;
 345
 346                     case 5:
 347                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_contributors_dark.html");
 348                         break;
 349
 350                     case 6:
 351                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_links_dark.html");
 352                         break;
 353                 }
 354             } else {  // The light theme is applied.
 355                 switch (tabNumber) {
 356                     case 1:
 357                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_permissions_light.html");
 358                         break;
 359
 360                     case 2:
 361                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_privacy_policy_light.html");
 362                         break;
 363
 364                     case 3:
 365                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_changelog_light.html");
 366                         break;
 367
 368                     case 4:
 369                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_licenses_light.html");
 370                         break;
 371
 372                     case 5:
 373                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_contributors_light.html");
 374                         break;
 375
 376                     case 6:
 377                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_links_light.html");
 378                         break;
 379                 }
 380             }
 381         }
 382
 383         // Return the formatted `tabLayout`.
 384         return tabLayout;
 385     }
 386 }