问如何使用SAX解析器解析XML

EN

public class MainActivity extends AppCompatActivity {
   ListView lvPcsPost;
    ArrayList<String> name;
    ArrayList<String> price;
    ArrayList<String> Description;
    LayoutInflater layoutInflater;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        lvPcsPost = (ListView) findViewById(R.id.lvPcsPost);
        name = new ArrayList<>();
        price = new ArrayList<>();
        Description = new ArrayList<>();
        new PostAsync().execute();
    }

    class PostAsync extends AsyncTask<Void, Void, Void> {
        ProgressDialog pd;
        XMLHelper helper;


        @Override
        protected void onPreExecute() {
            pd = ProgressDialog.show(MainActivity.this, "", "Loading...", true, false);
        }

        @Override
        protected Void doInBackground(Void... arg0) {
            helper = new XMLHelper();
            helper.get();
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            PostBaseAdapter postBaseAdapter = new PostBaseAdapter();
            lvPcsPost.setAdapter(postBaseAdapter);
            pd.dismiss();
        }

    }

    public class XMLHelper extends DefaultHandler {

        private String URL_MAIN = "http://uat.winitsoftware.com/ThemeManager/Data/Products/Products.xml";
        String TAG = "XMLHelper";

        Boolean currTag = false;
        String currTagVal = "";

        public void get() {
            try {
                SAXParserFactory factory = SAXParserFactory.newInstance();
                SAXParser mSaxParser = factory.newSAXParser();
                XMLReader mXmlReader = mSaxParser.getXMLReader();
                mXmlReader.setContentHandler(this);
                InputStream mInputStream = new URL(URL_MAIN).openStream();
                mXmlReader.parse(new InputSource(mInputStream));
            } catch (Exception e) {
                Log.e(TAG, "Exception: " + e.getMessage());
            }
        }

        @Override
        public void characters(char[] ch, int start, int length)
                throws SAXException {
            if (currTag) {
                currTagVal = currTagVal + new String(ch, start, length);
                currTag = false;
            }
        }

        @Override
        public void endElement(String uri, String localName, String qName)
                throws SAXException {
            currTag = false;

            if (localName.equalsIgnoreCase("Name"))
                name.add(currTagVal);

            else if (localName.equalsIgnoreCase("Description"))
             Description.add(currTagVal);

            else if (localName.equalsIgnoreCase("Price"))
              price.add(currTagVal);

        }
        @Override
        public void startElement(String uri, String localName, String qName,
                                 Attributes attributes) throws SAXException {
            Log.i(TAG, "TAG: " + localName);

            currTag = true;
            currTagVal = "";
            if (localName.equals("Products"));
        }
    }

    public class PostBaseAdapter extends BaseAdapter {

        public PostBaseAdapter() {

        }

        @Override
        public int getCount() {
            return name.size();
        }

        @Override
        public Object getItem(int position) {
            return name.get(position);
        }

        @Override
        public long getItemId(int position) {
            return 0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            layoutInflater = LayoutInflater.from(getApplicationContext());

            convertView = layoutInflater.inflate(R.layout.list_item_post, parent, false);
            TextView  txtPrice = (TextView) convertView.findViewById(R.id.txtPrice);
            TextView  txtDescription = (TextView) convertView.findViewById(R.id.txtDescription);
            TextView   txtName = (TextView) convertView.findViewById(R.id.txtName);
            ImageView   image = (ImageView) convertView.findViewById(R.id.Image);
            ImageView  bigImage = (ImageView) convertView.findViewById(R.id.BigImage);

                txtPrice.setText("Price : "+price.get(position));
                 txtDescription.setText("Description : "+Description.get(position));
                txtName.setText("Name : "+name.get(position));

            return convertView;
        }
    }
}