customxml.java

public static void createXml() throws Exception {

		try {
			// Initialization of drivers
			DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory
					.newInstance();
			DocumentBuilder documentBuilder = documentBuilderFactory
					.newDocumentBuilder();
			Document document = documentBuilder.newDocument();

			String xlFilePath = null;

			xlFilePath = "Resource\\Initial.xls";

			ExcelSheetLibrary lib = new ExcelSheetLibrary(xlFilePath);

			// Get the flagged cells with value = "Y" from excel file
			lib.GetFlaggedMethods("Flag");

			// Get the number of parameter to be created in XML
			int totalnoofelementsflaggedtorun = lib.flaggedMethod.size();

			// Type the suite tag element in the XML file
			Element rootElementsuite = document.createElement("suite");

			// Type the parameter set of lines in the XML file
			for (int elementcounter = 1; elementcounter <= totalnoofelementsflaggedtorun; elementcounter++) {
				Element rootElementparameter = document
						.createElement("parameter");

				String[] flagElement = lib.flaggedMethod.get(elementcounter)
						.toString().split(";");

				rootElementparameter.setAttribute("name", flagElement[0]);
				rootElementparameter.setAttribute("value", flagElement[1]);
				rootElementsuite.appendChild(rootElementparameter);
			}

			// Type the root elements in the XML file
			Element rootElementtest = document.createElement("test");
			Element rootElementClass = document.createElement("classes");
			Element childelementClass = document.createElement("class");
			// Assign attribute to the root elements
			childelementClass.setAttribute("name", "com.example.CalcAppTest");

			Element rootElementgroups = document.createElement("methods");

			// Assign attribute to the root elements
			rootElementsuite.setAttribute("name", "SimpleAppiumFramework");
			rootElementtest.setAttribute("name", "testing");

			// Append values to the root elements
			rootElementsuite.appendChild(rootElementtest);
			rootElementtest.appendChild(rootElementClass);
			rootElementClass.appendChild(childelementClass);
			childelementClass.appendChild(rootElementgroups);
			// rootElementgroups.appendChild(rootElementrun);
			document.appendChild(rootElementsuite);

			// Obtain the column value flag = "Y" in a loop
			for (int elementcounter = 1; elementcounter <= totalnoofelementsflaggedtorun; elementcounter++) {

				String element = "include";
				Element em = document.createElement(element);
				String[] flagElement = lib.flaggedMethod.get(elementcounter)
						.toString().split(";");

				em.setAttribute("name", flagElement[0]);
				rootElementgroups.appendChild(em);

			}

			// Generate the file.
			FileWriter fstream = new FileWriter("Resource\\testng.xml");
			BufferedWriter out = new BufferedWriter(fstream);

			// Generate the required XML output file
			TransformerFactory transformerFactory = TransformerFactory
					.newInstance();
			Transformer transformer = transformerFactory.newTransformer();
			DOMSource source = new DOMSource(document);

			// Prints all the Generated Xml code in the File object
			StreamResult result = new StreamResult(fstream);
			transformer.transform(source, result);

			// close the generated file.
			out.close();
		} catch (DOMException e) {
			e.printStackTrace();
		}
	}

	/**
	 * This method runs the XML suite file dynamically
	 * 
	 **/

	public static void autoRunXml() {

		// Create a list
		List files = new ArrayList();

		// Add the required xml files to the list
		files.add("Resource\\testNG.xml");

		// create object for TestNG
		TestNG tng = new TestNG();

		// Add the list of files to create a suite
		tng.setTestSuites(files);

		// Run the suite
		tng.run();

	}

This is the complete working code for TestNG custom library