Servizio per memorizzare oggetti Location

[sdullaz]

Salve a tutti, sto creando un servizio che automaticamente mi salvi la posizione gps ogni minuto. Faccio partire quindi il servizio da un activity e utilizzo la classe TimerTask per temporizzare l'operazione. All'interno del metodo run() di TimerTask inserisco i metodi per salvare la posizione ma in runtime mi da problemi (l'applicazione crasha e il logcat mi dice che il problema è nella implementazione del metodo run()). Se non utilizzo la temporizzazione, quindi salvo solo una volta la posizione gps tutto funziona.
Vi posto anche il codice se qualcuno può dirmi dove sbaglio.. Grazie!!

package it.helloworld.tour;

import java.io.FileN<span class="forTooltip">ot</span>FoundException;
import java.io.IOException;
import java.io.ObjectOutputStream;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import java.util.ArrayList;
import java.util.Timer; 
import java.util.TimerTask; 

public class Servizio exten<span class="forTooltip">ds</span> Service {
	
	private ArrayList<Location> poi = new ArrayList<Location>();
	private Timer timer;
	private String providerId = LocationManager.GPS_PROVIDER;
	private Location location;
	private LocationManager locationManager;
	private LocationListener listener = new LocationListener() {
		public void onStatusChanged(String provider, int status, Bundle extras) { 
		     
		  } 
		   public void onProviderEnabled(String provider) { 
		 
		  } 
		   public void onProviderDisabled(String provider) { 
		
		  } 
		   public void onLocationChanged(Location location) { 
		   
		  } 
	};
	
	public IBinder onBind(Intent intent) { 
		   return null; 
	} 
	
	public void onCreate(){
		super.onCreate();
		timer = new Timer();
		timer.schedule(new Esegui(), 0, 60000);		
	}
	
	public void onDestroy(){
		timer.cancel();
		timer = null;
		try {
			ObjectOutputStream oos = new ObjectOutputStream(<span class="forTooltip">op</span>enFileOutput("prova",Context.MODE_PRIVATE));
			oos.writeObject(poi);
			oos.close();
			
		} catch (FileN<span class="forTooltip">ot</span>FoundException e) {} catch (IOException e) {}
	}
	
	private class Esegui extends TimerTask{
		public void run(){
			locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
			locationManager.requestLocationUpdates(providerId, 5, 15, listener);
			location = locationManager.getLastKnownLocation(providerId);
			poi.add(location);
		}
	}
	
}
 
1
package it.helloworld.tour;
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​
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.ObjectOutputStream;
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import android.app.Service;
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import android.content.Context;
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import android.content.Intent;
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import android.location.Location;
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import android.location.LocationListener;
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import android.location.LocationManager;
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import android.os.Bundle;
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import android.os.IBinder;
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import java.util.ArrayList;
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import java.util.Timer; 
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import java.util.TimerTask; 
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​
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public class Servizio extends Service {
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    private ArrayList<Location> poi = new ArrayList<Location>();
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    private Timer timer;
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    private String providerId = LocationManager.GPS_PROVIDER;
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    private Location location;
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    private LocationManager locationManager;
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    private LocationListener listener = new LocationListener() {
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        public void onStatusChanged(String provider, int status, Bundle extras) { 
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          } 
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           public void onProviderEnabled(String provider) { 
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          } 
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           public void onProviderDisabled(String provider) { 
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          } 
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           public void onLocationChanged(Location location) { 
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          } 
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    };
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    public IBinder onBind(Intent intent) { 
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           return null; 
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    } 
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    public void onCreate(){
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        super.onCreate();
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        timer = new Timer();
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        timer.schedule(new Esegui(), 0, 60000);     
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    }
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    public void onDestroy(){
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        timer.cancel();
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        timer = null;
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        try {
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            ObjectOutputStream oos = new ObjectOutputStream(openFileOutput("prova",Context.MODE_PRIVATE));
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            oos.writeObject(poi);
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            oos.close();
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        } catch (FileNotFoundException e) {} catch (IOException e) {}
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    }
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    private class Esegui extends TimerTask{
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        public void run(){
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            locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
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            locationManager.requestLocationUpdates(providerId, 5, 15, listener);
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            location = locationManager.getLastKnownLocation(providerId);
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            poi.add(location);
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        }
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    }
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}

Vi allego anche il log

08-26 18:11:53.075: W/dalvikvm(30915): threadid=11: thread exiting with uncaught exception (group=0x40c371f8)
08-26 18:11:53.080: E/AndroidRuntime(30915): FATAL EXCEPTION: Timer-0
08-26 18:11:53.080: E/AndroidRuntime(30915): java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
08-26 18:11:53.080: E/AndroidRuntime(30915): 	at android.os.Handler.<init>(Handler.java:121)
08-26 18:11:53.080: E/AndroidRuntime(30915): 	at android.location.LocationManager$ListenerTransport$1.<init>(LocationManager.java:173)
08-26 18:11:53.080: E/AndroidRuntime(30915): 	at android.location.LocationManager$ListenerTransport.<init>(LocationManager.java:173)
08-26 18:11:53.080: E/AndroidRuntime(30915): 	at android.location.LocationManager._requestLocationUpdates(LocationManager.java:579)
08-26 18:11:53.080: E/AndroidRuntime(30915): 	at android.location.LocationManager.requestLocationUpdates(LocationManager.java:446)
08-26 18:11:53.080: E/AndroidRuntime(30915): 	at it.helloworld.tour.Servizio$Esegui.run(Servizio.java:64)
08-26 18:11:53.080: E/AndroidRuntime(30915): 	at java.util.Timer$TimerImpl.run(Timer.java:284)
08-26 18:12:21.040: I/Process(30915): Sending signal. PID: 30915 SIG: 9