Updater.java

package com.tuit.ar.services;

import java.util.Timer;
import java.util.TimerTask;

import android.app.Service;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Handler;
import android.os.IBinder;

import com.tuit.ar.api.Twitter;
import com.tuit.ar.api.TwitterAccount;
import com.tuit.ar.models.Settings;
import com.tuit.ar.models.SettingsObserver;
import com.tuit.ar.models.timeline.Friends;
import com.tuit.ar.models.timeline.Replies;

public class Updater extends Service implements SettingsObserver {
	private Timer timer;
	private Handler handler = new Handler();
	private Runnable runnable = new Runnable() {
		public void run() {
			try {
				TwitterAccount account = Twitter.getInstance().getDefaultAccount();
				Friends.getInstance(account).refresh();
				Replies.getInstance(account).refresh();
			} catch (Exception e) {
			}
		}
	};

	public Updater() {
		super();
	}

	@Override
	public IBinder onBind(Intent arg0) {
		return null;
	}

	public void onCreate() {
		super.onCreate();
		createTimer();
		Settings.getInstance().addObserver(this);
	}

	private void createTimer() {
		if (timer != null) timer.cancel();
		SharedPreferences preferences = Settings.getInstance().getSharedPreferences(getApplicationContext());
		if (!preferences.getBoolean(Settings.AUTOMATIC_UPDATE, Settings.AUTOMATIC_UPDATE_DEFAULT)) {
			return;
		}
		String interval = preferences.getString(Settings.UPDATE_INTERVAL, Settings.UPDATE_INTERVAL_DEFAULT);
		Integer freq = new Integer(interval);
		int miliFreq = freq * 1000 * 60;
		timer = new Timer();
		timer.scheduleAtFixedRate(
				new TimerTask() {
					public void run() {
						handler.post(runnable);
					}
				},
				miliFreq, miliFreq);
	}

	public void settingsHasChanged(Settings settings) {
		this.createTimer();
	}

	public void onDestroy() {
		super.onDestroy();
		timer.cancel();
	}
}