Https в приложении - Программирование Android - Ответ 8977604

conn = (HttpURLConnection) url.openConnection();
sslContext = SSLContext.getInstance("TLS");
sslContext.init(null, getArrayTrustManager(), new SecureRandom());
SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();
conn.setSSLSocketFactory(sslSocketFactory);
conn.setHostnameVerifier(new HostnameVerifier() {
   @Override
   public boolean verify(String s, SSLSession sslSession) {
      return true;
                }
            });

TrustManager[] getArrayTrustManager(){
        return new TrustManager[]{new X509TrustManager() {
            @Override
            public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
 
            }
 
            @Override
            public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
 
            }
 
            @Override
            public X509Certificate[] getAcceptedIssuers() {
                return new X509Certificate[0];
            }
        }
        };
    }