code: public static void setWifiOn(boolean isOn) {
      Settings.Global.putInt(
          RuntimeEnvironment.application.getContentResolver(), Settings.Global.WIFI_ON, isOn ? 1 : 0);
      Settings.System.putInt(
          RuntimeEnvironment.application.getContentResolver(), Settings.System.WIFI_ON, isOn ? 1 : 0);
    }
docs: Non-Android accessor that allows the value of the WIFI_ON setting to be set.
  
  @param isOn new status for wifi mode