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);       }   }  

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