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.SharedPreferences;
  25 import android.content.pm.PackageInfo;
  26 import android.content.pm.PackageManager;
  27 import android.content.pm.Signature;
  28 import android.os.Build;
  29 import android.os.Bundle;
  30 import android.preference.PreferenceManager;
  31 import android.text.SpannableStringBuilder;
  32 import android.text.Spanned;
  33 import android.text.style.ForegroundColorSpan;
  34 import android.view.LayoutInflater;
  35 import android.view.View;
  36 import android.view.ViewGroup;
  37 import android.webkit.WebView;
  38 import android.widget.TextView;
  39
  40 import androidx.annotation.NonNull;
  41 import androidx.fragment.app.Fragment;
  42
  43 import com.stoutner.privacybrowser.BuildConfig;
  44 import com.stoutner.privacybrowser.R;
  45
  46 import java.io.ByteArrayInputStream;
  47 import java.io.InputStream;
  48 import java.math.BigInteger;
  49 import java.security.Principal;
  50 import java.security.cert.CertificateException;
  51 import java.security.cert.CertificateFactory;
  52 import java.security.cert.X509Certificate;
  53 import java.text.DateFormat;
  54 import java.util.Date;
  55
  56 public class AboutTabFragment extends Fragment {
  57     // Declare the class variables.
  58     private int tabNumber;
  59     private String[] blocklistVersions;
  60
  61     public static AboutTabFragment createTab(int tabNumber, String[] blocklistVersions) {
  62         // Create a bundle.
  63         Bundle argumentsBundle = new Bundle();
  64
  65         // Store the tab number in the bundle.
  66         argumentsBundle.putInt("tab_number", tabNumber);
  67         argumentsBundle.putStringArray("blocklist_versions", blocklistVersions);
  68
  69         // Create a new instance of the tab fragment.
  70         AboutTabFragment aboutTabFragment = new AboutTabFragment();
  71
  72         // Add the arguments bundle to the fragment.
  73         aboutTabFragment.setArguments(argumentsBundle);
  74
  75         // Return the new fragment.
  76         return aboutTabFragment;
  77     }
  78
  79     @Override
  80     public void onCreate(Bundle savedInstanceState) {
  81         // Run the default commands.
  82         super.onCreate(savedInstanceState);
  83
  84         // Get a handle for the arguments.
  85         Bundle arguments = getArguments();
  86
  87         // Remove the incorrect lint warning below that arguments might be null.
  88         assert arguments != null;
  89
  90         // Store the arguments in class variables.
  91         tabNumber = getArguments().getInt("tab_number");
  92         blocklistVersions = getArguments().getStringArray("blocklist_versions");
  93     }
  94
  95     @Override
  96     public View onCreateView(@NonNull LayoutInflater layoutInflater, ViewGroup container, Bundle savedInstanceState) {
  97         // Create a tab layout view.
  98         View tabLayout;
  99
 100         // Get a handle for the context and assert that it isn't null.
 101         Context context = getContext();
 102         assert context != null;
 103
 104         // Get a handle for the shared preferences.
 105         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
 106
 107         // Get the theme preference.
 108         boolean darkTheme = sharedPreferences.getBoolean("dark_theme", false);
 109
 110         // Load the tabs.  Tab numbers start at 0.
 111         if (tabNumber == 0) {  // Load the about tab.
 112             // 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.
 113             tabLayout = layoutInflater.inflate(R.layout.about_tab_version, container, false);
 114
 115             // Get handles for the text views.
 116             TextView versionTextView = tabLayout.findViewById(R.id.version);
 117             TextView brandTextView = tabLayout.findViewById(R.id.brand);
 118             TextView manufacturerTextView = tabLayout.findViewById(R.id.manufacturer);
 119             TextView modelTextView = tabLayout.findViewById(R.id.model);
 120             TextView deviceTextView = tabLayout.findViewById(R.id.device);
 121             TextView bootloaderTextView = tabLayout.findViewById(R.id.bootloader);
 122             TextView radioTextView = tabLayout.findViewById(R.id.radio);
 123             TextView androidTextView = tabLayout.findViewById(R.id.android);
 124             TextView securityPatchTextView = tabLayout.findViewById(R.id.security_patch);
 125             TextView buildTextView = tabLayout.findViewById(R.id.build);
 126             TextView webViewProviderTextView = tabLayout.findViewById(R.id.webview_provider);
 127             TextView webViewVersionTextView = tabLayout.findViewById(R.id.webview_version);
 128             TextView orbotTextView = tabLayout.findViewById(R.id.orbot);
 129             TextView i2pTextView = tabLayout.findViewById(R.id.i2p);
 130             TextView openKeychainTextView = tabLayout.findViewById(R.id.open_keychain);
 131             TextView easyListTextView = tabLayout.findViewById(R.id.easylist);
 132             TextView easyPrivacyTextView = tabLayout.findViewById(R.id.easyprivacy);
 133             TextView fanboyAnnoyanceTextView = tabLayout.findViewById(R.id.fanboy_annoyance);
 134             TextView fanboySocialTextView = tabLayout.findViewById(R.id.fanboy_social);
 135             TextView ultraListTextView = tabLayout.findViewById(R.id.ultralist);
 136             TextView ultraPrivacyTextView = tabLayout.findViewById(R.id.ultraprivacy);
 137             TextView certificateIssuerDNTextView = tabLayout.findViewById(R.id.certificate_issuer_dn);
 138             TextView certificateSubjectDNTextView = tabLayout.findViewById(R.id.certificate_subject_dn);
 139             TextView certificateStartDateTextView = tabLayout.findViewById(R.id.certificate_start_date);
 140             TextView certificateEndDateTextView = tabLayout.findViewById(R.id.certificate_end_date);
 141             TextView certificateVersionTextView = tabLayout.findViewById(R.id.certificate_version);
 142             TextView certificateSerialNumberTextView = tabLayout.findViewById(R.id.certificate_serial_number);
 143             TextView certificateSignatureAlgorithmTextView = tabLayout.findViewById(R.id.certificate_signature_algorithm);
 144
 145             // Setup the labels.
 146             String version = getString(R.string.version) + " " + BuildConfig.VERSION_NAME + " (" + getString(R.string.version_code) + " " + BuildConfig.VERSION_CODE + ")";
 147             String brandLabel = getString(R.string.brand) + "  ";
 148             String manufacturerLabel = getString(R.string.manufacturer) + "  ";
 149             String modelLabel = getString(R.string.model) + "  ";
 150             String deviceLabel = getString(R.string.device) + "  ";
 151             String bootloaderLabel = getString(R.string.bootloader) + "  ";
 152             String androidLabel = getString(R.string.android) + "  ";
 153             String buildLabel = getString(R.string.build) + "  ";
 154             String webViewVersionLabel = getString(R.string.webview_version) + "  ";
 155             String easyListLabel = getString(R.string.easylist_label) + "  ";
 156             String easyPrivacyLabel = getString(R.string.easyprivacy_label) + "  ";
 157             String fanboyAnnoyanceLabel = getString(R.string.fanboy_annoyance_label) + "  ";
 158             String fanboySocialLabel = getString(R.string.fanboy_social_label) + "  ";
 159             String ultraListLabel = getString(R.string.ultralist_label) + "  ";
 160             String ultraPrivacyLabel = getString(R.string.ultraprivacy_label) + "  ";
 161             String issuerDNLabel = getString(R.string.issuer_dn) + "  ";
 162             String subjectDNLabel = getString(R.string.subject_dn) + "  ";
 163             String startDateLabel = getString(R.string.start_date) + "  ";
 164             String endDateLabel = getString(R.string.end_date) + "  ";
 165             String certificateVersionLabel = getString(R.string.certificate_version) + "  ";
 166             String serialNumberLabel = getString(R.string.serial_number) + "  ";
 167             String signatureAlgorithmLabel = getString(R.string.signature_algorithm) + "  ";
 168
 169             // The WebView layout is only used to get the default user agent from `bare_webview`.  It is not used to render content on the screen.
 170             // Once the minimum API >= 26 this can be accomplished with the WebView package info.
 171             View webViewLayout = layoutInflater.inflate(R.layout.bare_webview, container, false);
 172             WebView tabLayoutWebView = webViewLayout.findViewById(R.id.bare_webview);
 173             String userAgentString =  tabLayoutWebView.getSettings().getUserAgentString();
 174
 175             // Get the device's information and store it in strings.
 176             String brand = Build.BRAND;
 177             String manufacturer = Build.MANUFACTURER;
 178             String model = Build.MODEL;
 179             String device = Build.DEVICE;
 180             String bootloader = Build.BOOTLOADER;
 181             String radio = Build.getRadioVersion();
 182             String android = Build.VERSION.RELEASE + " (" + getString(R.string.api) + " " + Build.VERSION.SDK_INT + ")";
 183             String build = Build.DISPLAY;
 184             // Select the substring that begins after `Chrome/` and goes until the next ` `.
 185             String webView = userAgentString.substring(userAgentString.indexOf("Chrome/") + 7, userAgentString.indexOf(" ", userAgentString.indexOf("Chrome/")));
 186
 187             // Get the Orbot version name if Orbot is installed.
 188             String orbot;
 189             try {
 190                 // Store the version name.
 191                 orbot = context.getPackageManager().getPackageInfo("org.torproject.android", 0).versionName;
 192             } catch (PackageManager.NameNotFoundException exception) {  // Orbot is not installed.
 193                 orbot = "";
 194             }
 195
 196             // Get the I2P version name if I2P is installed.
 197             String i2p;
 198             try {
 199                 // Store the version name.
 200                 i2p = context.getPackageManager().getPackageInfo("net.i2p.android.router", 0).versionName;
 201             } catch (PackageManager.NameNotFoundException exception) {  // I2P is not installed.
 202                 i2p = "";
 203             }
 204
 205             // Get the OpenKeychain version name if it is installed.
 206             String openKeychain;
 207             try {
 208                 // Store the version name.
 209                 openKeychain = context.getPackageManager().getPackageInfo("org.sufficientlysecure.keychain", 0).versionName;
 210             } catch (PackageManager.NameNotFoundException exception) {  // OpenKeychain is not installed.
 211                 openKeychain = "";
 212             }
 213
 214             // Create a `SpannableStringBuilder` for the hardware and software `TextViews` that needs multiple colors of text.
 215             SpannableStringBuilder brandStringBuilder = new SpannableStringBuilder(brandLabel + brand);
 216             SpannableStringBuilder manufacturerStringBuilder = new SpannableStringBuilder(manufacturerLabel + manufacturer);
 217             SpannableStringBuilder modelStringBuilder = new SpannableStringBuilder(modelLabel + model);
 218             SpannableStringBuilder deviceStringBuilder = new SpannableStringBuilder(deviceLabel + device);
 219             SpannableStringBuilder bootloaderStringBuilder = new SpannableStringBuilder(bootloaderLabel + bootloader);
 220             SpannableStringBuilder androidStringBuilder = new SpannableStringBuilder(androidLabel + android);
 221             SpannableStringBuilder buildStringBuilder = new SpannableStringBuilder(buildLabel + build);
 222             SpannableStringBuilder webViewVersionStringBuilder = new SpannableStringBuilder(webViewVersionLabel + webView);
 223             SpannableStringBuilder easyListStringBuilder = new SpannableStringBuilder(easyListLabel + blocklistVersions[0]);
 224             SpannableStringBuilder easyPrivacyStringBuilder = new SpannableStringBuilder(easyPrivacyLabel + blocklistVersions[1]);
 225             SpannableStringBuilder fanboyAnnoyanceStringBuilder = new SpannableStringBuilder(fanboyAnnoyanceLabel + blocklistVersions[2]);
 226             SpannableStringBuilder fanboySocialStringBuilder = new SpannableStringBuilder(fanboySocialLabel + blocklistVersions[3]);
 227             SpannableStringBuilder ultraListStringBuilder = new SpannableStringBuilder(ultraListLabel + blocklistVersions[4]);
 228             SpannableStringBuilder ultraPrivacyStringBuilder = new SpannableStringBuilder(ultraPrivacyLabel + blocklistVersions[5]);
 229
 230             // Create the `blueColorSpan` variable.
 231             ForegroundColorSpan blueColorSpan;
 232
 233             // Set `blueColorSpan` according to the theme.  We have to use the deprecated `getColor()` until API >= 23.
 234             if (darkTheme) {
 235                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_400));
 236             } else {
 237                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_700));
 238             }
 239
 240             // Setup the spans to display the device information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 241             brandStringBuilder.setSpan(blueColorSpan, brandLabel.length(), brandStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 242             manufacturerStringBuilder.setSpan(blueColorSpan, manufacturerLabel.length(), manufacturerStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 243             modelStringBuilder.setSpan(blueColorSpan, modelLabel.length(), modelStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 244             deviceStringBuilder.setSpan(blueColorSpan, deviceLabel.length(), deviceStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 245             bootloaderStringBuilder.setSpan(blueColorSpan, bootloaderLabel.length(), bootloaderStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 246             androidStringBuilder.setSpan(blueColorSpan, androidLabel.length(), androidStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 247             buildStringBuilder.setSpan(blueColorSpan, buildLabel.length(), buildStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 248             webViewVersionStringBuilder.setSpan(blueColorSpan, webViewVersionLabel.length(), webViewVersionStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 249             easyListStringBuilder.setSpan(blueColorSpan, easyListLabel.length(), easyListStringBuilder.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
 250             easyPrivacyStringBuilder.setSpan(blueColorSpan, easyPrivacyLabel.length(), easyPrivacyStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 251             fanboyAnnoyanceStringBuilder.setSpan(blueColorSpan, fanboyAnnoyanceLabel.length(), fanboyAnnoyanceStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 252             fanboySocialStringBuilder.setSpan(blueColorSpan, fanboySocialLabel.length(), fanboySocialStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 253             ultraListStringBuilder.setSpan(blueColorSpan, ultraListLabel.length(), ultraListStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 254             ultraPrivacyStringBuilder.setSpan(blueColorSpan, ultraPrivacyLabel.length(), ultraPrivacyStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 255
 256             // Display the strings in the text boxes.
 257             versionTextView.setText(version);
 258             brandTextView.setText(brandStringBuilder);
 259             manufacturerTextView.setText(manufacturerStringBuilder);
 260             modelTextView.setText(modelStringBuilder);
 261             deviceTextView.setText(deviceStringBuilder);
 262             bootloaderTextView.setText(bootloaderStringBuilder);
 263             androidTextView.setText(androidStringBuilder);
 264             buildTextView.setText(buildStringBuilder);
 265             webViewVersionTextView.setText(webViewVersionStringBuilder);
 266             easyListTextView.setText(easyListStringBuilder);
 267             easyPrivacyTextView.setText(easyPrivacyStringBuilder);
 268             fanboyAnnoyanceTextView.setText(fanboyAnnoyanceStringBuilder);
 269             fanboySocialTextView.setText(fanboySocialStringBuilder);
 270             ultraListTextView.setText(ultraListStringBuilder);
 271             ultraPrivacyTextView.setText(ultraPrivacyStringBuilder);
 272
 273             // Only populate the radio text view if there is a radio in the device.
 274             if (!radio.isEmpty()) {
 275                 String radioLabel = getString(R.string.radio) + "  ";
 276                 SpannableStringBuilder radioStringBuilder = new SpannableStringBuilder(radioLabel + radio);
 277                 radioStringBuilder.setSpan(blueColorSpan, radioLabel.length(), radioStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 278                 radioTextView.setText(radioStringBuilder);
 279             } else {  // This device does not have a radio.
 280                 radioTextView.setVisibility(View.GONE);
 281             }
 282
 283             // Build.VERSION.SECURITY_PATCH is only available for SDK_INT >= 23.
 284             if (Build.VERSION.SDK_INT >= 23) {
 285                 String securityPatchLabel = getString(R.string.security_patch) + "  ";
 286                 String securityPatch = Build.VERSION.SECURITY_PATCH;
 287                 SpannableStringBuilder securityPatchStringBuilder = new SpannableStringBuilder(securityPatchLabel + securityPatch);
 288                 securityPatchStringBuilder.setSpan(blueColorSpan, securityPatchLabel.length(), securityPatchStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 289                 securityPatchTextView.setText(securityPatchStringBuilder);
 290             } else {  // The API < 23.
 291                 // Hide the security patch text view.
 292                 securityPatchTextView.setVisibility(View.GONE);
 293             }
 294
 295             // Only populate the WebView provider if the SDK >= 26.
 296             if (Build.VERSION.SDK_INT >= 26) {
 297                 // Create the WebView provider label.
 298                 String webViewProviderLabel = getString(R.string.webview_provider) + "  ";
 299
 300                 // Get the current WebView package info.
 301                 PackageInfo webViewPackageInfo = WebView.getCurrentWebViewPackage();
 302
 303                 // Remove the warning below that the package info might be null.
 304                 assert webViewPackageInfo != null;
 305
 306                 // Get the WebView provider name.
 307                 String webViewPackageName = webViewPackageInfo.packageName;
 308
 309                 // Create the spannable string builder.
 310                 SpannableStringBuilder webViewProviderStringBuilder = new SpannableStringBuilder(webViewProviderLabel + webViewPackageName);
 311
 312                 // Apply the coloration.
 313                 webViewProviderStringBuilder.setSpan(blueColorSpan, webViewProviderLabel.length(), webViewProviderStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 314
 315                 // Display the WebView provider.
 316                 webViewProviderTextView.setText(webViewProviderStringBuilder);
 317             } else {  // The API < 26.
 318                 // Hide the WebView provider text view.
 319                 webViewProviderTextView.setVisibility(View.GONE);
 320             }
 321
 322             // Only populate the Orbot text view if it is installed.
 323             if (!orbot.isEmpty()) {
 324                 String orbotLabel = getString(R.string.orbot) + "  ";
 325                 SpannableStringBuilder orbotStringBuilder = new SpannableStringBuilder(orbotLabel + orbot);
 326                 orbotStringBuilder.setSpan(blueColorSpan, orbotLabel.length(), orbotStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 327                 orbotTextView.setText(orbotStringBuilder);
 328             } else {  // Orbot is not installed.
 329                 orbotTextView.setVisibility(View.GONE);
 330             }
 331
 332             // Only populate the I2P text view if it is installed.
 333             if (!i2p.isEmpty()) {
 334                 String i2pLabel = getString(R.string.i2p)  + "  ";
 335                 SpannableStringBuilder i2pStringBuilder = new SpannableStringBuilder(i2pLabel + i2p);
 336                 i2pStringBuilder.setSpan(blueColorSpan, i2pLabel.length(), i2pStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 337                 i2pTextView.setText(i2pStringBuilder);
 338             } else {  // I2P is not installed.
 339                 i2pTextView.setVisibility(View.GONE);
 340             }
 341
 342             // Only populate the OpenKeychain text view if it is installed.
 343             if (!openKeychain.isEmpty()) {
 344                 String openKeychainLabel = getString(R.string.openkeychain) + "  ";
 345                 SpannableStringBuilder openKeychainStringBuilder = new SpannableStringBuilder(openKeychainLabel + openKeychain);
 346                 openKeychainStringBuilder.setSpan(blueColorSpan, openKeychainLabel.length(), openKeychainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 347                 openKeychainTextView.setText(openKeychainStringBuilder);
 348             } else {  //OpenKeychain is not installed.
 349                 openKeychainTextView.setVisibility(View.GONE);
 350             }
 351
 352             // Display the package signature.
 353             try {
 354                 // Get the first package signature.  Suppress the lint warning about the need to be careful in implementing comparison of certificates for security purposes.
 355                 @SuppressLint("PackageManagerGetSignatures") Signature packageSignature = getContext().getPackageManager().getPackageInfo(getContext().getPackageName(),
 356                         PackageManager.GET_SIGNATURES).signatures[0];
 357
 358                 // Convert the signature to a byte array input stream.
 359                 InputStream certificateByteArrayInputStream = new ByteArrayInputStream(packageSignature.toByteArray());
 360
 361                 // Display the certificate information on the screen.
 362                 try {
 363                     // Instantiate a `CertificateFactory`.
 364                     CertificateFactory certificateFactory = CertificateFactory.getInstance("X509");
 365
 366                     // Generate an `X509Certificate`.
 367                     X509Certificate x509Certificate = (X509Certificate) certificateFactory.generateCertificate(certificateByteArrayInputStream);
 368
 369                     // Store the individual sections of the certificate that we are interested in.
 370                     Principal issuerDNPrincipal = x509Certificate.getIssuerDN();
 371                     Principal subjectDNPrincipal = x509Certificate.getSubjectDN();
 372                     Date startDate = x509Certificate.getNotBefore();
 373                     Date endDate = x509Certificate.getNotAfter();
 374                     int certificateVersion = x509Certificate.getVersion();
 375                     BigInteger serialNumberBigInteger = x509Certificate.getSerialNumber();
 376                     String signatureAlgorithmNameString = x509Certificate.getSigAlgName();
 377
 378                     // Create a `SpannableStringBuilder` for each `TextView` that needs multiple colors of text.
 379                     SpannableStringBuilder issuerDNStringBuilder = new SpannableStringBuilder(issuerDNLabel + issuerDNPrincipal.toString());
 380                     SpannableStringBuilder subjectDNStringBuilder = new SpannableStringBuilder(subjectDNLabel + subjectDNPrincipal.toString());
 381                     SpannableStringBuilder startDateStringBuilder = new SpannableStringBuilder(startDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(startDate));
 382                     SpannableStringBuilder endDataStringBuilder = new SpannableStringBuilder(endDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(endDate));
 383                     SpannableStringBuilder certificateVersionStringBuilder = new SpannableStringBuilder(certificateVersionLabel + certificateVersion);
 384                     SpannableStringBuilder serialNumberStringBuilder = new SpannableStringBuilder(serialNumberLabel + serialNumberBigInteger);
 385                     SpannableStringBuilder signatureAlgorithmStringBuilder = new SpannableStringBuilder(signatureAlgorithmLabel + signatureAlgorithmNameString);
 386
 387                     // Setup the spans to display the device information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 388                     issuerDNStringBuilder.setSpan(blueColorSpan, issuerDNLabel.length(), issuerDNStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 389                     subjectDNStringBuilder.setSpan(blueColorSpan, subjectDNLabel.length(), subjectDNStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 390                     startDateStringBuilder.setSpan(blueColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 391                     endDataStringBuilder.setSpan(blueColorSpan, endDateLabel.length(), endDataStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 392                     certificateVersionStringBuilder.setSpan(blueColorSpan, certificateVersionLabel.length(), certificateVersionStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 393                     serialNumberStringBuilder.setSpan(blueColorSpan, serialNumberLabel.length(), serialNumberStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 394                     signatureAlgorithmStringBuilder.setSpan(blueColorSpan, signatureAlgorithmLabel.length(), signatureAlgorithmStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 395
 396                     // Display the strings in the text boxes.
 397                     certificateIssuerDNTextView.setText(issuerDNStringBuilder);
 398                     certificateSubjectDNTextView.setText(subjectDNStringBuilder);
 399                     certificateStartDateTextView.setText(startDateStringBuilder);
 400                     certificateEndDateTextView.setText(endDataStringBuilder);
 401                     certificateVersionTextView.setText(certificateVersionStringBuilder);
 402                     certificateSerialNumberTextView.setText(serialNumberStringBuilder);
 403                     certificateSignatureAlgorithmTextView.setText(signatureAlgorithmStringBuilder);
 404                 } catch (CertificateException e) {
 405                     // Do nothing if there is a certificate error.
 406                 }
 407             } catch (PackageManager.NameNotFoundException e) {
 408                 // Do nothing if `PackageManager` says Privacy Browser isn't installed.
 409             }
 410         } else { // load a WebView for all the other tabs.  Tab numbers start at 0.
 411             // 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.
 412             tabLayout = layoutInflater.inflate(R.layout.bare_webview, container, false);
 413
 414             // Get a handle for `tabWebView`.
 415             WebView tabWebView = (WebView) tabLayout;
 416
 417             // Load the tabs according to the theme.
 418             if (darkTheme) {  // The dark theme is applied.
 419                 // Set the background color.  The deprecated `.getColor()` must be used until the minimum API >= 23.
 420                 tabWebView.setBackgroundColor(getResources().getColor(R.color.gray_850));
 421
 422                 switch (tabNumber) {
 423                     case 1:
 424                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_permissions_dark.html");
 425                         break;
 426
 427                     case 2:
 428                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_privacy_policy_dark.html");
 429                         break;
 430
 431                     case 3:
 432                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_changelog_dark.html");
 433                         break;
 434
 435                     case 4:
 436                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_licenses_dark.html");
 437                         break;
 438
 439                     case 5:
 440                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_contributors_dark.html");
 441                         break;
 442
 443                     case 6:
 444                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_links_dark.html");
 445                         break;
 446                 }
 447             } else {  // The light theme is applied.
 448                 switch (tabNumber) {
 449                     case 1:
 450                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_permissions_light.html");
 451                         break;
 452
 453                     case 2:
 454                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_privacy_policy_light.html");
 455                         break;
 456
 457                     case 3:
 458                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_changelog_light.html");
 459                         break;
 460
 461                     case 4:
 462                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_licenses_light.html");
 463                         break;
 464
 465                     case 5:
 466                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_contributors_light.html");
 467                         break;
 468
 469                     case 6:
 470                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_links_light.html");
 471                         break;
 472                 }
 473             }
 474         }
 475
 476         // Return the formatted `tabLayout`.
 477         return tabLayout;
 478     }
 479 }