小妹经过两天时间的google+百度，搜出来很多本应解决此问题的自定义SSLSocketFactory，然而在4.1-4.4的模拟器上始终报错
javax.net.ssl.SSLHandshakeException: javax.net.ssl.SSLProtocolException: SSL handshake aborted: ssl=0xb7daa998: Failure in SSL library, usually a protocol error
error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure (external/openssl/ssl/s23_clnt.c:741 0x9c42d7f1:0x00000000)

开始以为是因为okhttp或者okhttp3访问的问题，结果今天用HttpsURLConnection重新写了一遍，在20+没有任何问题，16+还是不报错，实在不知道什么原因高人求解，谢谢

访问源代码如下：
public static String httpGet(String httpUrl) {
        BufferedReader input = null;
        StringBuilder sb = null;
        URL url = null;
        HttpURLConnection con = null;
        String cre = Credentials.basic(username,password);//此处为伪代码
        Log.d("request","Credentials:"+cre);
//        return response.request().newBuilder().header("Authorization",cre).build();
        try {
            url = new URL(httpUrl);
            try {
//                trustAllHosts();
                HttpsURLConnection https = (HttpsURLConnection)url.openConnection();
                https.addRequestProperty("Authorization",cre);
                SSLSocketFactory sf = new MySSLSocketFactory();
                https.setSSLSocketFactory(sf);
                if (url.getProtocol().toLowerCase().equals("https")) {
                   https.setHostnameVerifier(DO_NOT_VERIFY);
                    con = https;
                } else {
                    con = (HttpURLConnection)url.openConnection();
                }
                input = new BufferedReader(new InputStreamReader(con.getInputStream()));
                sb = new StringBuilder();
                String s;
                while ((s = input.readLine()) != null) {
                    sb.append(s).append("\n");
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (MalformedURLException e1) {
            e1.printStackTrace();
        } finally {
            // close buffered
            if (input != null) {
                try {
                    input.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            // disconnecting releases the resources held by a connection so they may be closed or reused
            if (con != null) {
                con.disconnect();
            }
        }

        return sb == null ? null : sb.toString();
    }


使用的MySSLSocketFactory内容如下
public class MySSLSocketFactory extends SSLSocketFactory {

    private SSLContext sc;
    private SSLSocketFactory mSSLSocketFactory;

    public MySSLSocketFactory() {
        try {
            sc = SSLContext.getInstance("TLSv1.2");
            sc.init(null, null, null);
            mSSLSocketFactory = sc.getSocketFactory();

        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (KeyManagementException e) {
            e.printStackTrace();
        }
    }

    @Override
    public String[] getDefaultCipherSuites() {
        return mSSLSocketFactory.getDefaultCipherSuites();
    }

    @Override
    public String[] getSupportedCipherSuites() {
        return mSSLSocketFactory.getSupportedCipherSuites();
    }

    @Override
    public Socket createSocket(Socket s, String host, int port, boolean autoClose) throws IOException {
        return enableTLS(mSSLSocketFactory.createSocket(s, host, port, autoClose));
    }

    @Override
    public Socket createSocket(String host, int port) throws IOException, UnknownHostException {
        return enableTLS(mSSLSocketFactory.createSocket(host, port));
    }

    @Override
    public Socket createSocket(String host, int port, InetAddress localHost, int localPort) throws IOException, UnknownHostException {
        return enableTLS(mSSLSocketFactory.createSocket(host, port, localHost, localPort));
    }

    @Override
    public Socket createSocket(InetAddress host, int port) throws IOException {
        return enableTLS(mSSLSocketFactory.createSocket(host, port));
    }

    @Override
    public Socket createSocket(InetAddress address, int port, InetAddress localAddress, int localPort) throws IOException {
        return enableTLS(mSSLSocketFactory.createSocket(address, port, localAddress, localPort));
    }

    private Socket enableTLS(Socket socket) {
        if(socket != null && (socket instanceof SSLSocket)) {
            String[] protocols = new String[] {
                    "TLSv1.2"
            };
            ((SSLSocket) socket).setEnabledProtocols(protocols);
        }
        return socket;
    }
}

编译器版本为api25不知是否与此有关