Kane-Shih

1. To enable TLS 1.2 in Android 4.4
  Copy TLSSocketFactory.java

  If using HttpsURLConnection:
    => conn.setSSLSocketFactory(new TLSSocketFactory());
  Else if using OkHttp:
    => new OkHttpClient.Builder().setSocketFactory(new TLSSocketFactory()). ... .build();
  Else if using HttpClient:
       sample for legacy apache http library: https://github.com/Kane-Shih/TestApacheHttpClient
    => see: https://stackoverflow.com/questions/2603691/android-httpclient-and-https