//原先的方法
    private boolean inChinaNetwork() {
        String str = this.mCountryIso;
        if (str == null || str.length() != 2) {
            updateCountryIsoCode();
        }
        if (!isChineseIso(this.mCountryIso)) {
            return false;
        }
        if (!DBG) {
            return true;
        }
        Log.d(TAG, "Need to skip captive portal check. CISO: " + this.mCountryIso);
        return true;
    }
//注意看这，原先对中国大陆，香港特别行政区，以及澳门特别行政区统一对待
private boolean isChineseIso(String countryIso) {
        return "cn".equalsIgnoreCase(countryIso) || "hk".equalsIgnoreCase(countryIso) || "mo".equalsIgnoreCase(countryIso);
    }

//后来的方法
private boolean isNetworkNeedChnPublicDns() {
        try {
            String countryCode = SemCscFeature.getInstance().getString("CountryISO").toLowerCase();
            if (DBG) {
                Log.d(TAG, "Public DNS via Property(CSC) : countryCode: " + countryCode);
            }
            if (countryCode == null || countryCode.length() != 2 || !"cn".equalsIgnoreCase(countryCode)) {
                return false;
            }
            return true;
        } catch (Exception e) {
            return false;
        }
    }
//此外，更新后仅看固件版本，港版不受影响