android 判断 wifi 是否是 5G

 /**
     * 判断 wifi 是否是 5G MHZ.
     * 需要权限:
     * <uses-permission android:name="android.permission.INTERNET" />
     * <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
     * <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
     * <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
     */
    public static boolean isWifi5G(Context context) {
        int freq = 0;
        WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
        WifiInfo wifiInfo = wifiManager.getConnectionInfo();
        if (android.os.Build.VERSION.SDK_INT > android.os.Build.VERSION_CODES.LOLLIPOP) {
            freq = wifiInfo.getFrequency();
        } else {
            String ssid = wifiInfo.getSSID();
            if (ssid != null && ssid.length() > 2) {
                String ssidTemp = ssid.substring(1, ssid.length() - 1);
                List<ScanResult> scanResults = wifiManager.getScanResults();
                for (ScanResult scanResult : scanResults) {
                    if (scanResult.SSID.equals(ssidTemp)) {
                        freq = scanResult.frequency;
                        break;
                    }
                }
            }
        }
        return freq > 4900 && freq < 5900;
    }

注意 不要忘记添加权限