Android GPS获取地理位置 .

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 CurrentLocation 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){ }
    };
    private void updateWithNewLocation(Location location) {
            String latLongString;
            TextView myLocationText;
            myLocationText = (TextView)findViewById(R.id.myLocationText);
            if (location != null) {
            double lat = location.getLatitude();
            double lng = location.getLongitude();
            latLongString = "纬度:" + lat + "/n经度:" + lng;
            } else {
            latLongString = "无法获取地理信息";
            }
            myLocationText.setText("您当前的位置是:/n" +
            latLongString);
    }
}