KeyStore keyStore = KeyStore.getInstance("PKCS12");
FileInputStream clientCertificateContent = new FileInputStream("/path/to/publicAndPrivateKey.p12");
keyStore.load(clientCertificateContent, "private key password".toCharArray());

KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
keyManagerFactory.init(keyStore, "private key password".toCharArray());

FileInputStream myTrustedCAFileContent = new FileInputStream("/path/to/embedded/CA-Chain.pem");
CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
X509Certificate myCAPublicKey = (X509Certificate) certificateFactory.generateCertificate(myTrustedCAFileContent);

KeyStore trustedStore = KeyStore.getInstance(KeyStore.getDefaultType());
trustedStore.load(null);
trustedStore.setCertificateEntry(myCAPublicKey.getSubjectX500Principal().getName(), myCAPublicKey);
TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
trustManagerFactory.init(trustedStore);
TrustManager[] trustManagers = trustManagerFactory.getTrustManagers();

SSLContext sslContext = SSLContext.getInstance("TLS");
sslContext.init(keyManagerFactory.getKeyManagers(), trustManagers, null);

OkHttpClient client = new OkHttpClient();
client.setSslSocketFactory(sslContext.getSocketFactory());
client.newCall(new Request.Builder()
    .url("https://easytaxi.com.br")
    .build()
).execute();