使用volley进行https请求，Hostname xxxxx not verified:
看了一下源码，主要是因为此方法的 getSubjectAltNames(certificate, ALT_DNS_NAME)返回为null,具体原因不明。

    /**
     * Returns true if {@code certificate} matches {@code hostName}.
     */
    private boolean verifyHostName(String hostName, X509Certificate certificate) {
        hostName = hostName.toLowerCase(Locale.US);
        boolean hasDns = false;
        for (String altName : getSubjectAltNames(certificate, ALT_DNS_NAME)) {
            hasDns = true;
            if (verifyHostName(hostName, altName)) {
                return true;
            }
        }

        if (!hasDns) {
            X500Principal principal = certificate.getSubjectX500Principal();
            // RFC 2818 advises using the most specific name for matching.
            String cn = new DistinguishedNameParser(principal).findMostSpecific("cn");
            if (cn != null) {
                return verifyHostName(hostName, cn);
            }
        }

        return false;
    }

解决方法是：

    public class YxpHurlStack extends HurlStack {


        public YxpHurlStack(UrlRewriter urlRewriter, SSLSocketFactory sslSocketFactory) {
            super(urlRewriter, sslSocketFactory);
        }

        @Override
        protected HttpURLConnection createConnection(URL url) throws IOException {
            HttpsURLConnection httpsURLConnection = (HttpsURLConnection) super.createConnection(url);
            try {
                httpsURLConnection.setHostnameVerifier(getHostnameVerifier());
            } catch (Exception e) {
                e.printStackTrace();
            }
            return httpsURLConnection;
        }

        // Let's assume your server app is hosting inside a server machine
        // which has a server certificate in which "Issued to" is "localhost",for example.
        // Then, inside verify method you can verify "localhost".
        // If not, you can temporarily return true
        private HostnameVerifier getHostnameVerifier() {
            return new HostnameVerifier() {
                @Override
                public boolean verify(String hostname, SSLSession session) {
                    //return true; // verify always returns true, which could cause insecure network traffic due to trusting TLS/SSL server certificates for wrong hostnames

//                    HostnameVerifier hv = HttpsURLConnection.getDefaultHostnameVerifier();
//                    boolean isVerify = hv.verify("121.25.201.236", session);
//                    return isVerify;
                    return true;
                }
            };
        }

    }

然后：

    public static RequestQueue newRequestQueue(Context context, int maxDiskCacheBytes) {

        SSLSocketFactory sslSocketFactory = initSSLSocketFactory(context);
        YxpHurlStack stack = new YxpHurlStack(null, sslSocketFactory);
        return Volley.newRequestQueue(context, stack, maxDiskCacheBytes);
    }

参考：
https://stackoverflow.com/questions/32403479/volley-ssl-hostname-was-not-verified