android使用GoogleMap，如何获取到当前位置或特定位置的经纬度


    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mapview);
        
        LocationManager tmpLocationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
     if (tmpLocationManager.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER)) 
     {
        Toast.makeText(this, "GPS模块正常", Toast.LENGTH_SHORT).show();
        return;
     }
     Toast.makeText(this, "请开启GPS！", Toast.LENGTH_SHORT).show();
     Intent intent =new Intent(Settings.ACTION_SECURITY_SETTINGS);
     startActivityForResult(intent,0); //此为设置完成后返回到获取界面
    
     Criteria c=new Criteria();
        c.setAccuracy(Criteria.ACCURACY_FINE);   
        c.setAltitudeRequired(false);   
        c.setBearingRequired(false);   
        c.setCostAllowed(true);   
        c.setPowerRequirement(Criteria.POWER_LOW);   
     String provider = tmpLocationManager.getBestProvider(c, true);
     Location location = tmpLocationManager.getLastKnownLocation(provider);
//preTime=System.currentTimeMillis();
     updateWithNewLocation(location);
     tmpLocationManager.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.MaptextView);   
        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);   
}   
以上代码有何错误？