AndroidApp如何防止抓包

URLConnection conn = url.openConnection()

public URLConnection openConnection(Proxy proxy)
    throws java.io.IOException

URLConnection conn = url.openConnection(Proxy.NO_PROXY)

public final static Proxy NO_PROXY = new Proxy();
// Creates the proxy that represents a {@code DIRECT} connection.
private Proxy() {
    type = Type.DIRECT;
    sa = null;
}

public enum Type {
    
    DIRECT,
    
    HTTP,
    
    SOCKS
};

val myCrt: X509Certificate by lazy {
    getCrt(R.raw.my_ca)
}

private fun getCrt(@RawRes raw: Int): X509Certificate {
    val certificateFactory = CertificateFactory.getInstance("X.509")
    val input = ApplicationContext.resources.openRawResource(raw)
    input.use {
        return certificateFactory.generateCertificate(input) as X509Certificate
    }
}

private fun getTrustManagerInRelease(): X509TrustManager {
    return object : X509TrustManager {
        override fun checkClientTrusted(chain: Array<X509Certificate>, authType: String?) {}
        override fun getAcceptedIssuers(): Array<X509Certificate> = arrayOf()
        override fun checkServerTrusted(chain: Array<X509Certificate>, authType: String?) {
            val myCrt: X509Certificate = myCrt
            if (chain[0].subjectDN.name == myCrt.subjectDN.name) {
                if (!myCrt.signature!!.contentEquals(chain[0].signature)) {
                    throw SSLHandshakeException("签名不符！")
                }
            }
        }
    }
}

    private fun getClient(ssl: SSLSocketFactory, trustManager: X509TrustManager): OkHttpClient {
        return OkHttpClient.Builder()
            .retryOnConnectionFailure(true)
            .proxy(Proxy.NO_PROXY)
            .sslSocketFactory(ssl, trustManager)
            .build()
    }