content: package com.termux.app.activities;
  
  import android.content.ActivityNotFoundException;
  import android.content.Intent;
  import android.net.Uri;
  import android.os.Bundle;
  import android.view.ViewGroup;
  import android.webkit.WebSettings;
  import android.webkit.WebView;
  import android.webkit.WebViewClient;
  import android.widget.ProgressBar;
  import android.widget.RelativeLayout;
  
  import androidx.appcompat.app.AppCompatActivity;
  
  import com.termux.shared.termux.TermuxConstants;
  
  /** Basic embedded browser for viewing help pages. */
  public final class HelpActivity extends AppCompatActivity {
  
      WebView mWebView;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
  
          final RelativeLayout progressLayout = new RelativeLayout(this);
          RelativeLayout.LayoutParams lParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
          lParams.addRule(RelativeLayout.CENTER_IN_PARENT);
          ProgressBar progressBar = new ProgressBar(this);
          progressBar.setIndeterminate(true);
          progressBar.setLayoutParams(lParams);
          progressLayout.addView(progressBar);
  
          mWebView = new WebView(this);
          WebSettings settings = mWebView.getSettings();
          settings.setCacheMode(WebSettings.LOAD_NO_CACHE);
  //        settings.setAppCacheEnabled(false);
          setContentView(progressLayout);
          mWebView.clearCache(true);
  
          mWebView.setWebViewClient(new WebViewClient() {
              @Override
              public boolean shouldOverrideUrlLoading(WebView view, String url) {
                  if (url.equals(TermuxConstants.TERMUX_WIKI_URL) || url.startsWith(TermuxConstants.TERMUX_WIKI_URL + "/")) {
                      // Inline help.
                      setContentView(progressLayout);
                      return false;
                  }
  
                  try {
                      startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
                  } catch (ActivityNotFoundException e) {
                      // Android TV does not have a system browser.
                      setContentView(progressLayout);
                      return false;
                  }
                  return true;
              }
  
              @Override
              public void onPageFinished(WebView view, String url) {
                  setContentView(mWebView);
              }
          });
          mWebView.loadUrl(TermuxConstants.TERMUX_WIKI_URL);
      }
  
      @Override
      public void onBackPressed() {
          if (mWebView.canGoBack()) {
              mWebView.goBack();
          } else {
              super.onBackPressed();
          }
      }
  
  }
  