OkHttpClient.Builder builder = new OkHttpClient.Builder();
final TrustManager[] trustAllCerts = new TrustManager[]{
        new X509TrustManager() {
            @Override
            public void checkClientTrusted(java.security.cert.X509Certificate[] chain, String authType) {
            }
 
            @Override
            public void checkServerTrusted(java.security.cert.X509Certificate[] chain, String authType) {
            }
 
            @Override
            public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                return new java.security.cert.X509Certificate[]{};
            }
        }
};
try {
    final SSLContext sslContext = SSLContext.getInstance("SSL");
    sslContext.init(null, trustAllCerts, new java.security.SecureRandom());
    final SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();
    builder.sslSocketFactory(sslSocketFactory, (X509TrustManager) trustAllCerts[0]);
    builder.hostnameVerifier(new HostnameVerifier() {
        @Override
        public boolean verify(String hostname, SSLSession session) {
            return true;
        }
    });
} catch (Exception e) {
    e.printStackTrace();
}
builder.connectTimeout(20, TimeUnit.SECONDS).readTimeout(20, TimeUnit.SECONDS);
OkHttpClient client = builder.build();