The protocol standard for android to obtain wifi

How can I get and change wifi standard, which I'm using now in my android device. For example: IEEE 802.11b or IEEE 802.11g or IEEE 802.11n. If this is possible.

Call the supportedStandards of ScanedWifiInfo

private ScanedWifiInfo getActiveScanedWifiInfo(){
        if(!NetworkUtils.isWifiConnected(HwContext.getContext())) return null ;
        List<ScanedWifiInfo> scans = CacheArrayManager.getInstance(HwContext.getContext()).getScanWifiInfos();
        ScanedWifiInfo scanedWifiInfo = null;
        if (scans != null && scans.size() > 0){
            for (ScanedWifiInfo scan : scans){
                if (scan.isActive()){
                    scanedWifiInfo = scan;
                    break;
                }
            }
        }
        return scanedWifiInfo;
    }

getActiveScanedWifiInfo().supportedStandards;

The return value is a string

String tmpRadio = "";

        if (A) {
            tmpRadio += "a";
            if (N) {
                tmpRadio += "/n";
            }
            if (AC) {
                tmpRadio += "/ac";
            }
        } else {
            tmpRadio += "b";
            if (G) {
                tmpRadio += "/g";
            }
            if (N) {
                tmpRadio += "/n";
            }
        }
        radio += tmpRadio;
        supportedStandards = tmpRadio;

can also be obtained using

 public void getWifiStandard(Context context){
        WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
        try {
            WifiInfo wifiInfo = wifiManager.getConnectionInfo();
            Log.e("WifiStandard",wifiInfo.getWifiStandard()+"");
        }catch (Exception e){
            Log.e("WifiStandard",e.toString());
        }
    }