[Android] 3G, WiFi 체크하기

ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
  boolean is_3g = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).isConnectedOrConnecting();
  Log.e("Joongil", "is_3g : " + is_3g);
  boolean is_wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnectedOrConnecting();
  Log.e("Joongil", "is_wifi :" + is_wifi);