将.cer文件添加到okhttp

InputStream inputStream = context.getResources().openRawResource(R.raw.certificate);

CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");

X509Certificate certificate = (X509Certificate) certificateFactory.generateCertificate(inputStream);

KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
keyStore.load(null, null);

keyStore.setCertificateEntry("alias", certificate);

TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
trustManagerFactory.init(keyStore);

SSLContext sslContext = SSLContext.getInstance("TLS");
sslContext.init(null, trustManagerFactory.getTrustManagers(), null);

OkHttpClient client = new OkHttpClient.Builder()
    .sslSocketFactory(sslContext.getSocketFactory(), trustManagerFactory.getTrustManagers()[0])
    .build();