mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2000, 10, new LocationListener() {
            @Override
            public void onLocationChanged(Location location) {
                if (location != null) {
                    msg = msg + "\n位置(onLocationChanged): " + location.getLongitude() + "," + location.getLatitude();
                } else {
                    msg = msg + "\n位置(onLocationChanged): location is null";
                }
                new SendMsgTask().execute();
            }

            @Override
            public void onStatusChanged(String provider, int status, Bundle extras) {
            }

            @Override
            public void onProviderEnabled(String provider) {
                Location location = mLocationManager.getLastKnownLocation(provider);
                if (location != null) {
                    msg = msg + "\n位置(onProviderEnabled): " + location.getLongitude() + "," + location.getLatitude();
                } else {
                    msg = msg + "\n位置(onProviderEnabled): location is null";
                }
                new SendMsgTask().execute();
            }

            @Override
            public void onProviderDisabled(String provider) {

            }
        });

provider = LocationManager.NETWORK_PROVIDER;
        location = mLocationManager.getLastKnownLocation(provider);
        
        if (location != null) {
            msg = msg + "\n位置(" + provider + "): " + location.getLongitude() + "," + location.getLatitude();
        } else {
            msg = msg + "\n位置(" + provider + "): location is null";
        }