Android Open Source - City-Outdoors-Android Load Data If Stale Service

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License

The source code is released under:

Copyright (c) 2012, Edinburgh Council All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are ...

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Java Source Code

package uk.co.jarofgreen.cityoutdoors.Service;
//from   w w w. j ava  2s .c o  m


import android.app.IntentService;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.preference.PreferenceManager;
import android.util.Log;
/**
 * 
 * @author James Baster  <james@jarofgreen.co.uk>
 * @copyright City of Edinburgh Council & James Baster
 * @license Open Source under the 3-clause BSD License
 * @url https://github.com/City-Outdoors/City-Outdoors-Android
 */
public class LoadDataIfStaleService  extends IntentService {

  public LoadDataIfStaleService() {
    super("LoadDataIfStaleService");
  }

  protected void onHandleIntent(Intent intent) {  

    long now = java.lang.System.currentTimeMillis();

    SharedPreferences settings=PreferenceManager.getDefaultSharedPreferences(this);
    long last = settings.getLong("lastDataUpdate", 0);

    boolean updateNeeded = false;
    
    if (last == 0) {
      updateNeeded = true;
      Log.d("UPDATE","Yes, never updated before");      
    } else if (now > last) {
      // if last updated more than a certain time ago
      Log.d("UPDATEDATENOW",Long.toString(now));
      Log.d("UPDATEDATELAST",Long.toString(last));
      Log.d("UPDATEDATEMINUS",Long.toString(now - last));
      ConnectivityManager connManager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
      NetworkInfo mWifi = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
      long interval;
      if (mWifi.isConnected()) {
        Log.d("UPDATE","WiFi Connected so 1 week");
        interval = 1000*60*60*24*7;
      } else {
        Log.d("UPDATE","No WiFi so 1 month");
        interval = (long)1000*(long)60*(long)60*(long)24*(long)30; // cast everything to a long; if maths done as int it overflows!
        
      }
      Log.d("UPDATEINTERVAL",String.valueOf(interval));
      
      if ((now - last) > interval) {
        updateNeeded = true;
        Log.d("UPDATE","Yes, to old");
      }          
    } else {
      // this is just a catch; if last > now someone has been messing with system clock and we should definetly update.
      updateNeeded = true;
      Log.d("UPDATE","Yes, clock has run backwards");
    }
    
    if (updateNeeded) {
      startService(new Intent(this, LoadDataService.class));
    }
    
  }
  
  
}

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