javax.net.ssl.SSLHandshakeException: 
    java.security.cert.CertPathValidatorException: 
        Trust anchor for certification path not found.

public static SSLSocketFactory getSSLSocketFactory() throws Exception {
        //创建一个不验证证书链的证书信任管理器。
        final TrustManager[] trustAllCerts = new TrustManager[]{new X509TrustManager() {
            @Override
            public void checkClientTrusted(
                    java.security.cert.X509Certificate[] chain,
                    String authType) throws CertificateException {
            }

            @Override
            public void checkServerTrusted(
                    java.security.cert.X509Certificate[] chain,
                    String authType) throws CertificateException {
            }

            @Override
            public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                return new java.security.cert.X509Certificate[0];
            }
        }};

        // Install the all-trusting trust manager
        final SSLContext sslContext = SSLContext.getInstance("TLS");
        sslContext.init(null, trustAllCerts,
                new java.security.SecureRandom());
        // Create an ssl socket factory with our all-trusting manager
        return sslContext
                .getSocketFactory();
    }


  //使用自定义SSLSocketFactory
  private void onHttps(OkHttpClient.Builder builder) {
       try {
            builder.sslSocketFactory(getSSLSocketFactory()).hostnameVerifier(org.apache.http.conn.ssl.SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    /**
     * 单项认证
     */
    public static SSLSocketFactory getSSLSocketFactoryForOneWay(InputStream... certificates) {
        try {
            CertificateFactory certificateFactory = CertificateFactory.getInstance(CLIENT_TRUST_MANAGER, CLIENT_TRUST_PROVIDER);
            KeyStore keyStore = KeyStore.getInstance(CLIENT_TRUST_KEYSTORE);
            keyStore.load(null);
            int index = 0;
            for (InputStream certificate : certificates) {
                String certificateAlias = Integer.toString(index++);
                keyStore.setCertificateEntry(certificateAlias, certificateFactory.generateCertificate(certificate));
                try {
                    if (certificate != null)
                        certificate.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            SSLContext sslContext = SSLContext.getInstance(CLIENT_AGREEMENT);

            TrustManagerFactory trustManagerFactory =
                    TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());

            trustManagerFactory.init(keyStore);
            sslContext.init(null, trustManagerFactory.getTrustManagers(), new SecureRandom());
            return sslContext.getSocketFactory();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

InputStream certificate12306 = Utils.getContext().getResources().openRawResource(R.raw.srca);
        OkHttpClient okHttpClient = new OkHttpClient.Builder()
                .readTimeout(Constants.DEFAULT_TIMEOUT, TimeUnit.MILLISECONDS)
                .connectTimeout(Constants.DEFAULT_TIMEOUT, TimeUnit.MILLISECONDS)
                .addInterceptor(interceptor)
                .addInterceptor(new HttpHeaderInterceptor())
                .addNetworkInterceptor(new HttpCacheInterceptor())
                .sslSocketFactory(SslContextFactory.getSSLSocketFactoryForOneWay(certificate12306))  
                .hostnameVerifier(new SafeHostnameVerifier())
                .cache(cache)
                .build();

 private class SafeHostnameVerifier implements HostnameVerifier {
        @Override
        public boolean verify(String hostname, SSLSession session) {
            if (Constants.IP.equals(hostname)) {//校验hostname是否正确，如果正确则建立连接
                return true;
            }
            return false;
        }
    }

  /**
     * 双向认证
     *
     * @return SSLSocketFactory
     */
    public static SSLSocketFactory getSSLSocketFactoryForTwoWay() {
        try {
            InputStream certificate = Utils.getContext().getResources().openRawResource(R.raw.capk);
            //  CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509", "BC");
            KeyStore keyStore = KeyStore.getInstance(CLIENT_TRUST_KEY);
            keyStore.load(certificate, SELF_CERT_PWD.toCharArray());
            KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
            kmf.init(keyStore, SELF_CERT_PWD.toCharArray());

            try {
                if (certificate != null)
                    certificate.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

            //初始化keystore
            KeyStore clientKeyStore = KeyStore.getInstance(CLIENT_TRUST_KEYSTORE);
            clientKeyStore.load(Utils.getContext().getResources().openRawResource(R.raw.cabks), TRUST_CA_PWD.toCharArray());

            SSLContext sslContext = SSLContext.getInstance(CLIENT_AGREEMENT);
            TrustManagerFactory trustManagerFactory = TrustManagerFactory.
                    getInstance(TrustManagerFactory.getDefaultAlgorithm());

            trustManagerFactory.init(clientKeyStore);

            KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
            keyManagerFactory.init(clientKeyStore, SELF_CERT_PWD.toCharArray());

            sslContext.init(kmf.getKeyManagers(), trustManagerFactory.getTrustManagers(), new SecureRandom());
            return sslContext.getSocketFactory();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

OkHttpClient okHttpClient = new OkHttpClient.Builder()
                .readTimeout(Constants.DEFAULT_TIMEOUT, TimeUnit.MILLISECONDS)
                .connectTimeout(Constants.DEFAULT_TIMEOUT, TimeUnit.MILLISECONDS)
                .addInterceptor(interceptor)
                .addInterceptor(new HttpHeaderInterceptor())
                .addNetworkInterceptor(new HttpCacheInterceptor())
                .sslSocketFactory(SslContextFactory.getSSLSocketFactoryForTwoWay()) 
                .hostnameVerifier(new SafeHostnameVerifier())
                .cache(cache)
                .build();