<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>

locationm = (LocationManager) getSystemService(LOCATION_SERVICE);
   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 = locationm.getBestProvider(criteria, true);

   Location location = locationm.getLastKnownLocation(provider);
       //獲得上次的記錄
   gps_loc(location);

   LocationListener GPS_listener = new LocationListener() {
   //監聽位置變化，實時獲取位置信息
       @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) {
          // TODO Auto-generated method stub

       }

       @Override
       public void onLocationChanged(Location location) {
          // TODO Auto-generated method stub
   //位置發生改變時
gps_loc(location);
}
};
locationm.requestLocationUpdates(provider, 1000, 0, GPS_listener);
}

// 獲得自己位置
private void gps_loc(Location location) {
   if (location != null) {
       self_weidu = location.getLatitude();
       self_jindu = location.getLongitude();
   } else {
       self_weidu = 0;
       self_jindu = 0;
   }
}