private static String getRomVersion(final String propertyName) {
        String ret = "";
        if (!TextUtils.isEmpty(propertyName)) {
            ret = getSystemProperty(propertyName);
        }
        if (TextUtils.isEmpty(ret) || ret.equals(UNKNOWN)) {
            try {
                String display = Build.DISPLAY;
                if (!TextUtils.isEmpty(display)) {
                    ret = display.toLowerCase();
                }
            } catch (Throwable ignore) {/**/}
        }
        if (TextUtils.isEmpty(ret)) {
            return UNKNOWN;
        }
        return ret;
    }
/}
        return UNKNOWN;
    }

    private static String getBrand() {
        try {
            String brand = Build.BRAND;
            if (!TextUtils.isEmpty(brand)) {
                return brand.toLowerCase();
            }
        } catch (Throwable ignore) {/*
app/src/main/java/com/example/jingbin/webviewstudy/utils/RomUtils.java