Android Open Source - SandB-Android Xml Pull Service

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License

The source code is released under:
GNU General Public License
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Java Source Code

package edu.grinnell.sandb.xmlpull;
/*  w w  w.  ja va2  s . c  om*/
import java.io.IOException;
import java.io.InputStream;
import java.util.Calendar;

import org.xmlpull.v1.XmlPullParserException;

import android.app.AlarmManager;
import android.app.IntentService;
import android.app.PendingIntent;
import android.app.PendingIntent.CanceledException;
import android.content.Intent;
import android.database.SQLException;
import android.util.Log;
import edu.grinnell.sandb.MainPrefs;
import edu.grinnell.sandb.data.ArticleTable;

public class XmlPullService extends IntentService {

  private static final String TAG = "XmlPullService";
  
  public static final String DOWNLOAD_FEED    = "edu.grinnell.sandb.xmlpull.DOWNLOAD_FEED";
  public static final String CHECK_DOWNLOAD   = "edu.grinnell.sandb.xmlpull.CHECK_DOWNLOAD";
  public static final String RESULT_ACTION    = "edu.grinnell.sandb.xmlpull.RESULT_ACTION";
  public static final String LAST_CHECKED_MS  = "edu.grinnell.sandb.xmlpull.LAST_CHECKED_MS";
  
  public static final String FEED_URL = "http://www.thesandb.com/feed";
  
  private PendingIntent finished;
  
  private MainPrefs mPrefs;
  
  public XmlPullService() {
    super(TAG);
    mPrefs = new MainPrefs(this);
  }

  @Override
  protected void onHandleIntent(Intent i) {
    String action = i.getAction();
    Log.i(TAG, "Action: " + action);
    
    finished = i.getParcelableExtra(RESULT_ACTION);
    if (DOWNLOAD_FEED.equals(action)) {
      finished = i.getParcelableExtra(RESULT_ACTION);
      downloadFeed();
    } else if (CHECK_DOWNLOAD.equals(action)) {
      finished = i.getParcelableExtra(RESULT_ACTION);
      long lastCheckedMs = i.getLongExtra(LAST_CHECKED_MS, 0);
      lastCheckedMs = mPrefs.lastUpdated;
      checkAndDownload(lastCheckedMs);
    } else {
      Log.e(TAG, "Unknown Intent.  Action = " + action);
    }
  }
  
  private void downloadFeed() {

    InputStream feed = XmlFetchTask.downloadDataFromServer(FEED_URL);
    if (feed != null)
      parseXmlFromStream(feed);
    else {
      Log.i("DataReceived", "stream is NULL!");
      finishUp();
    }
  }
  
  private void checkAndDownload(long lastCheckedMs) {

    try {
      long lastModifiedMs = XmlCheckAgeTask.lastModified(FEED_URL);
      
      Calendar lastUpdated = Calendar.getInstance();
      lastUpdated.setTimeInMillis(lastModifiedMs);
      Calendar lastChecked = Calendar.getInstance();
      lastChecked.setTimeInMillis(lastCheckedMs);
      Long now = Calendar.getInstance().getTimeInMillis();
      mPrefs.setLastUpdated(now);
      if (lastChecked.before(lastUpdated) || lastUpdated == null) {
        Log.i(TAG, "Feed out of date, updating..");
        downloadFeed();
      } else {
        AlarmManager m = (AlarmManager) XmlPullService.this.getSystemService(ALARM_SERVICE);
        Intent i = new Intent(CHECK_DOWNLOAD);
        i.putExtra(LAST_CHECKED_MS, now);
        PendingIntent pi = PendingIntent.getService(XmlPullService.this, 0, i, PendingIntent.FLAG_UPDATE_CURRENT);
        m.set(AlarmManager.RTC, AlarmManager.INTERVAL_DAY, pi);
        stopSelf();
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  
  private void parseXmlFromStream(InputStream xmlStream) {

    ArticleTable table = new ArticleTable(this);
    
    try {
      table.open();
      table.clearTable();
      XmlParseTask.parseArticlesFromStream(xmlStream, this, table);
    } catch (IOException ioe) {
      Log.e(TAG, "parseArticlesFromStream", ioe);
    } catch (XmlPullParserException xppe) {
      Log.e(TAG, "parseArticlesFromStream", xppe);
    } catch (SQLException sqle) {
      Log.e(TAG, "SQLExeption", sqle);
    } catch (Exception e) {
      Log.e(TAG, "parseArticlesFromStream", e);
    } finally {
      table.close();
      finishUp();
    }
  }
  
  private void finishUp() {
    mPrefs.setFirstRun(false);
    try {  
      finished.send();
    } catch (CanceledException e) {
      Log.w(TAG, "Intent canceled by MainActivity..");
    } finally {
      stopSelf();
    }
  }

}
Java Source Code List
