How to write a program to send a request to a given site address, receive an xml file and extract data from it?

Question

Android

How to write a program to send a request to a given site address, receive an xml file and extract data from it? Please describe in detail if you can. If you can at least part of this process fully explain.

Answer 1

A question from the category - how to write a program for Android. :)
The scheme is as follows:
1. Form a request 2. If successful, launch the
parser
3. Return data
Looks like this:

  private void downloadContent() {
    HttpURLConnection connection = null;
    BufferedInputStream ins = null;
    String urlString = "<заданный адрес сайта>";

    try {
      URL url = new URL(urlString);

      connection = (HttpURLConnection) url.openConnection();
      int status = connection.getResponseCode();
      if (status == HttpURLConnection.HTTP_OK) {
        XmlPullParser parser = XmlPullParserFactory.newInstance().newPullParser();
        ins = new BufferedInputStream(connection.getInputStream());
        parser.setInput(ins, null);
        parseData(parser);
      }

    } catch (Exception e) {
      // надо обработать исключение
    } finally {
      if (ins != null) {
        try {
          ins.close();
        } catch (IOException e) {}
      }
    }

  }
  
  public void parseData(XmlPullParser parser) throws XmlPullParserException, IOException {

    int eventType = parser.getEventType();
    final String xmlTag = "rootTAG";

    do {
      if (eventType == XmlPullParser.START_TAG) {
        String name = parser.getName();
        if (xmlTag.equalsIgnoreCase(name) && (parser.getAttributeCount() > 0)) {
          for (int i = 0, N = parser.getAttributeCount(); i < N; i++) {
            // парсим атрибуты
            parseAttribute(parser.getAttributeName(i), parser.getAttributeValue(i));
          }
        }
        // парсим вложенный таг
        parseTag(parser);
      }
      eventType = parser.next();
    } while (!(eventType == XmlPullParser.END_TAG && xmlTag.equals(parser.getName()))
            && (eventType != XmlPullParser.END_DOCUMENT));

  }

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