如何监听位置变化，我用DDMS只能监听到一次

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如何监听位置变化，我用DDMS只能监听到一次3

RT，代码如下：

package oms.test;

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 test 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 contest =Context.LOCATION_SERVICE;
        locationManager= (LocationManager)getSystemService(contest);
        Location location =locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
        updateWithNewLocation(location);
        
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 0, locationListener);
        
        
    }
    
    private final LocationListener locationListener = new LocationListener() {
		
		@Override
		public void onStatusChanged(String provider, int status, Bundle extras) {
			// TODO Auto-generated method stub
			
		}
		
		@Override
		public void onProviderEnabled(String provider) {
			// TODO Auto-generated method stub
			
		}
		
		@Override
		public void onProviderDisabled(String provider) {
			updateWithNewLocation(null);
			
		}
		
		@Override
		public void onLocationChanged(Location location) {
			updateWithNewLocation(location);
			
		}
	};
	
	
	private void updateWithNewLocation (Location location){
		String locationString;
		TextView textView;
		textView =(TextView)findViewById(R.id.textview1);
		if (location!=null){
			locationString="lat:"+location.getLatitude()+"\n long:"+location.getLongitude();
		}else{
			locationString="no data";
		}
		textView.setText(locationString);
	}
    
}

第一次可以通过ddms发送的经纬度正确监听到，后面几次一点反应都没有，请问这是怎么回事？

Android