public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  ContentResolver cr = this.getContentResolver();
  try {
   if (Settings.System.getInt(cr, Settings.System.WIFI_USE_STATIC_IP)==0){
    Log.d("Demo", "No use Static IP!");
   }
   else{
    Log.d("Demo", "use Static IP and Change IP to 192.168.1.123!");
    Settings.System.putString(cr, Settings.System.WIFI_STATIC_IP, "192.168.1.125");
    Settings.System.putString(cr, Settings.System.WIFI_STATIC_GATEWAY, "192.168.1.1");
    Settings.System.putString(cr, Settings.System.WIFI_STATIC_NETMASK, "255.255.255.0");
    Settings.System.putString(cr, Settings.System.WIFI_STATIC_DNS1, "202.103.24.68");
    Settings.System.putString(cr, Settings.System.WIFI_STATIC_DNS2, "202.103.0.68");
   }
  } catch (SettingNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
}