Android獲取當前連接wifi的信道

做網絡診斷，需要診斷當前wifi所在信道是否擁擠，目前只是解決了獲取當前wifi所在信道，主要是用ScanResult 的frequency字段，還需要用SSID和BSSID從ScanResults匹配到當前的wifi信號wifiInfo，具體代碼如下：

    public static int getCurrentChannel(Context context) {
        WifiManager wifiManager = (WifiManager) context
                .getSystemService(Context.WIFI_SERVICE);

        WifiInfo wifiInfo = wifiManager.getConnectionInfo();// 當前wifi連接信息
        List scanResults = wifiManager.getScanResults();
        for (ScanResult result : scanResults) {
            if (result.BSSID.equalsIgnoreCase(wifiInfo.getBSSID())
                    && result.SSID.equalsIgnoreCase(wifiInfo.getSSID()
                            .substring(1, wifiInfo.getSSID().length() - 1))) {
                return getChannelByFrequency(result.frequency);
            }
        }

        return -1;
    }

    /**
     * 根據頻率獲得信道
     * 
     * @param frequency
     * @return
     */
    public static int getChannelByFrequency(int frequency) {
        int channel = -1;
        switch (frequency) {
        case 2412:
            channel = 1;
            break;
        case 2417:
            channel = 2;
            break;
        case 2422:
            channel = 3;
            break;
        case 2427:
            channel = 4;
            break;
        case 2432:
            channel = 5;
            break;
        case 2437:
            channel = 6;
            break;
        case 2442:
            channel = 7;
            break;
        case 2447:
            channel = 8;
            break;
        case 2452:
            channel = 9;
            break;
        case 2457:
            channel = 10;
            break;
        case 2462:
            channel = 11;
            break;
        case 2467:
            channel = 12;
            break;
        case 2472:
            channel = 13;
            break;
        case 2484:
            channel = 14;
            break;
        case 5745:
            channel = 149;
            break;
        case 5765:
            channel = 153;
            break;
        case 5785:
            channel = 157;
            break;
        case 5805:
            channel = 161;
            break;
        case 5825:
            channel = 165;
            break;
        }
        return channel;
    }