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);
      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();
      }
    }
  
  }