通过google api获得位置的方向

	private String[] getDirectionData(String sourceLat, String sourceLong,
			String destinationLat, String destinationLong) {
		
		String urlString = "http://maps.google.com/maps?f=d&hl=en&" + "saddr="
				+ sourceLat + "," + sourceLong + "&daddr=" + destinationLat
				+ "," + destinationLong + "&ie=UTF8&0&om=0&output=kml";
		Log.d("URL", urlString);
		Document doc = null;
		HttpURLConnection urlConnection = null;
		URL url = null;
		String pathConent = "";
		
		try {
			
			url = new URL(urlString.toString());
			urlConnection = (HttpURLConnection) url.openConnection();
			urlConnection.setRequestMethod("GET");
			urlConnection.setDoOutput(true);
			urlConnection.setDoInput(true);
			urlConnection.connect();
			DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
			DocumentBuilder db = dbf.newDocumentBuilder();
			doc = db.parse(urlConnection.getInputStream());
			
		} catch (Exception e) {
		}
		
		NodeList nl = doc.getElementsByTagName("LineString");
		for (int s = 0; s < nl.getLength(); s++) {
			Node rootNode = nl.item(s);
			NodeList configItems = rootNode.getChildNodes();
			for (int x = 0; x < configItems.getLength(); x++) {
				Node lineStringNode = configItems.item(x);
				NodeList path = lineStringNode.getChildNodes();
				pathConent = path.item(0).getNodeValue();
			}
		}
		String[] tempContent = pathConent.split(" ");
		return tempContent;
	}