如何从Java下拉AndroidManifest.xml中列出的应用程序版本？

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.File;

public class ManifestParser {
    public static void main(String[] args) {
        try {
            File manifestFile = new File("AndroidManifest.xml");
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse(manifestFile);

            Element manifestElement = document.getDocumentElement();
            String versionCode = manifestElement.getAttribute("android:versionCode");
            String versionName = manifestElement.getAttribute("android:versionName");

            System.out.println("Version Code: " + versionCode);
            System.out.println("Version Name: " + versionName);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}