// Permission 추가 // IP Address 가져오는 코드 public class MainActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); checkAvailableConnection(); } void checkAvailableConnection() { ConnectivityManager connMgr = (ConnectivityManager) this .getSystemService(Context.CONNECTIVITY_SERVICE); final android.net..