Youtor
Download XML from a Web Server Android Programming
YOUR LINK HERE:
http://youtube.com/watch?v=kJY4SJ3IgGk
Tutorial showing how to download XML data from a sample Google AppEngine web server (http://demoprojectserver1234.appspot....) in an Android project. Full Android code below. • // imports omitted due to YouTube space restriction! • // Some code based on content in Android Application Development in 24 hours by Darcey and Conder (2nd ed). • /** • Demonstrate querying a basic application server for information. • * • */ • public class MainActivity extends Activity { • private static final String TAG = ProjectServerDemo ; • • public static final String APP_ID = 3fa19507-c746-4dfa-8ded-ec60ef4d30d9 ; • public static final String SERVER_URL = http://demoprojectserver1234.appspot.... ; • public static final String QUERY_FILE = xmlquery.cgi ; • public static final String QUERY_OPTIONS = ?appid= + APP_ID; • public static final String QUERY_URL = SERVER_URL + QUERY_FILE + QUERY_OPTIONS; • @Override • protected void onCreate(Bundle savedInstanceState) { • super.onCreate(savedInstanceState); • setContentView(R.layout.activity_main); • } • public void onClick_ClearDisplay(View v) { • TextView textView = (TextView) findViewById(R.id.displayData); • textView.setText( ); • } • public void onClick_QueryServer(View v) { • Log.i(TAG, Query server... ); • AsyncDownloader downloader = new AsyncDownloader(); • downloader.execute(); • } • • private void handleNewRecord(String itemId, String data) { • TextView textView = (TextView) findViewById(R.id.displayData); • String message = • textView.getText().toString() + \ • + • itemId + : + data; • • textView.setText(message); • } • • • // Inner class for doing background download. • // REVISIT:- Change the [[ to a less than; ]] to a greater than. • // (YouTube won't let you use those characters...) • private class AsyncDownloader extends AsyncTask[[Object, String, Integer]] { • @Override • protected Integer doInBackground(Object... arg0) { • XmlPullParser receivedData = tryDownloadingXmlData(); • int recordsFound = tryParsingXmlData(receivedData); • return recordsFound; • } • private XmlPullParser tryDownloadingXmlData() { • try { • Log.i(TAG, Now downloading... ); • URL xmlUrl = new URL(QUERY_URL); • XmlPullParser receivedData = XmlPullParserFactory.newInstance().newPullParser(); • receivedData.setInput(xmlUrl.openStream(), null); • return receivedData; • } catch (XmlPullParserException e) { • Log.e(TAG, XmlPullParserExecption , e); • } catch (IOException e) { • Log.e(TAG, XmlPullParserExecption , e); • } • return null; • } • private int tryParsingXmlData(XmlPullParser receivedData) { • if (receivedData != null) { • try { • return processReceivedData(receivedData); • } catch (XmlPullParserException e) { • Log.e(TAG, Pull Parser failure , e); • } catch (IOException e) { • Log.e(TAG, IO Exception parsing XML , e); • } • } • return 0; • } • private int processReceivedData(XmlPullParser xmlData) throws XmlPullParserException, IOException { • int recordsFound = 0; • // Find values in the XML records • String appId = ; // Attributes • String itemId = ; • String timeStamp = ; • String data = ; // Text • • int eventType = -1; • while (eventType != XmlResourceParser.END_DOCUMENT) { • String tagName = xmlData.getName(); • switch (eventType) { • case XmlResourceParser.START_TAG: • // Start of a record, so pull values encoded as attributes. • if (tagName.equals( record )) { • appId = xmlData.getAttributeValue(null, appid ); • itemId = xmlData.getAttributeValue(null, itemid ); • timeStamp = xmlData.getAttributeValue(null, timestamp ); • data = ; • } • break; • // Grab data text (very simple processing) • // NOTE: This could be full XML data to process. • case XmlResourceParser.TEXT: • data += xmlData.getText(); • break; • case XmlPullParser.END_TAG: • if (tagName.equals( record )) { • recordsFound++; • publishProgress(appId, itemId, data, timeStamp); • } • break; • } • eventType = xmlData.next(); • } • // Handle no data available: Publish an empty event. • if (recordsFound == 0) { • publishProgress(); • } • Log.i(TAG, Finished processing +recordsFound+ records. ); • return recordsFound; • } • @Override • protected void onProgressUpdate(String... values) { • if (values.length == 0) { • Log.i(TAG, No data downloaded ); • } • if (values.length == 4) { • String appId = values[0]; • String itemId = values[1]; • String data = values[2]; • String timeStamp = values[3]; • • // Log it • Log.i(TAG, AppID: + appId + , Timestamp: + timeStamp); • Log.i(TAG, ItemID: + itemId + , Data: + data); • • // Pass it to the application • handleNewRecord(itemId, data); • • } • super.onProgressUpdate(values); • } • } • }
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