程式突然不會重複執行了!

小弟之前用這個範例程式再加上一個簡單的加總變數可以測程式到底有沒有在跑
之前也是很正常的 突然有一天他的執行次數就一直卡在1 緯度經度也都沒更新 我重新拿了最原始的檔案來跑也沒有用了 不知道是怎麼回事! 求教各位!


p ackage com.GPSCurrentLocation;


import com.GPSCurrentLocation.R;

import android.app.Activity;
import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;

public class GPSCurrentLocation extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        LocationManager locationManager;
        String serviceName = Context.LOCATION_SERVICE;
        locationManager = (LocationManager)getSystemService(serviceName);
        //String provider = LocationManager.GPS_PROVIDER;
        
        Criteria criteria = new Criteria();
        criteria.setAccuracy(Criteria.ACCURACY_FINE);
        criteria.setAltitudeRequired(false);
        criteria.setBearingRequired(false);
        criteria.setCostAllowed(true);
        criteria.setPowerRequirement(Criteria.POWER_LOW);
        String provider = locationManager.getBestProvider(criteria, true);
        
        Location location = locationManager.getLastKnownLocation(provider);
        updateWithNewLocation(location);
        locationManager.requestLocationUpdates(provider, 2000, 10,
                        locationListener);
    }
   private final LocationListener locationListener = new LocationListener() {
            public void onLocationChanged(Location location) {
            updateWithNewLocation(location);
            }
            public void onProviderDisabled(String provider){
            updateWithNewLocation(null);
            }
            public void onProviderEnabled(String provider){ }
            public void onStatusChanged(String provider, int status,
            Bundle extras){ }
    };
    int sum =0;
    private void updateWithNewLocation(Location location) {
            String latLongString;
            TextView myLocationText;
            myLocationText = (TextView)findViewById(R.id.myLocationText);
            TextView showsumText;
            showsumText = (TextView)findViewById(R.id.showsumText);
            if (location != null) {
            double lat = location.getLatitude();
            double lng = location.getLongitude();
            latLongString = "緯度:" + lat + "
經度:" + lng;
            } else {
            latLongString = "ERRO";
            }
            myLocationText.setText("
目前位置:" +
            latLongString);
            sum++;

            showsumText.setText("執行次數" + sum);
    }
}