Android Open Source - Sparse-RSS Refresh Service

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Sparse rss Copyright (c) 2010-2012 Stefan Handschuh Translators - Dutch: Eelko Berkenpies - Spanish: Sergio Mart?n - French: <unnamed> - Turkish: <unnamed> - Russian: Igor Nedoboy Code-Contri...

Java Source Code

/**
 * Sparse rss/*w  ww. j a  v  a 2s. c o  m*/
 * 
 * Copyright (c) 2010 Stefan Handschuh
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

package de.shandschuh.sparserss.service;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.IBinder;
import android.os.SystemClock;
import android.preference.PreferenceManager;
import de.shandschuh.sparserss.Strings;

public class RefreshService extends Service {   
  private static final String SIXTYMINUTES = "3600000";
  
    private OnSharedPreferenceChangeListener listener = new OnSharedPreferenceChangeListener() {
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
      if (Strings.SETTINGS_REFRESHINTERVAL.equals(key)) {
        restartTimer(false);
      }
    }
    };

    private Intent refreshBroadcastIntent;
    
  private AlarmManager alarmManager;
  
  private PendingIntent timerIntent;
  
  
  
  private SharedPreferences preferences = null;
  
  @Override
  public IBinder onBind(Intent intent) {
    onRebind(intent);
    return null;
  }
  
  @Override
  public void onRebind(Intent intent) {
    super.onRebind(intent);
  }

  @Override
  public boolean onUnbind(Intent intent) {
    return true;  // we want to use rebind
  }

  @Override
  public void onCreate() {
    super.onCreate();
    try {
      preferences = PreferenceManager.getDefaultSharedPreferences(createPackageContext(Strings.PACKAGE, 0));
    } catch (NameNotFoundException e) {
      preferences = PreferenceManager.getDefaultSharedPreferences(this);
    }
    
    refreshBroadcastIntent = new Intent(Strings.ACTION_REFRESHFEEDS).putExtra(Strings.SCHEDULED, true);
    alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
    preferences.registerOnSharedPreferenceChangeListener(listener);
    restartTimer(true);
  }

  private void restartTimer(boolean created) {
    if (timerIntent == null) {
      timerIntent = PendingIntent.getBroadcast(this, 0, refreshBroadcastIntent, 0);
    } else {
      alarmManager.cancel(timerIntent);
    }
    
    int time = 3600000;
    
    try {
      time = Math.max(60000, Integer.parseInt(preferences.getString(Strings.SETTINGS_REFRESHINTERVAL, SIXTYMINUTES)));
    } catch (Exception exception) {

    }
    
    long initialRefreshTime = SystemClock.elapsedRealtime() + 10000;
    
    if (created) {
      long lastRefresh = preferences.getLong(Strings.PREFERENCE_LASTSCHEDULEDREFRESH, 0);
      
      if (lastRefresh > 0) {
        // this indicates a service restart by the system
        initialRefreshTime = Math.max(SystemClock.elapsedRealtime() + 10000, lastRefresh+time);
      }
    }
    
    alarmManager.setInexactRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, initialRefreshTime, time, timerIntent);
  }

  @Override
  public void onDestroy() {
    if (timerIntent != null) {
      alarmManager.cancel(timerIntent);
    }
    preferences.unregisterOnSharedPreferenceChangeListener(listener);
    super.onDestroy();
  }
}

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