WebViewClient implementation for Android API 19 (maybe 21?) devices having issues with SSL certificates

MyWebViewClient.java

/**
 * Typical error:
 *
 * X509Util: Failed to validate the certificate chain, error: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.
 * MyWebViewClient: onReceivedSslError: handler = [Handler (com.android.webview.chromium.WebViewContentsClientAdapter$3) {9d87c030}], error = [primary error: 3 certificate: Issued to:
 *     CN=*.bootstrapcdn.com,OU=Domain Control Validated;
 *     Issued by: CN=Sectigo RSA Domain Validation Secure Server CA,O=Sectigo Limited,L=Salford,ST=Greater Manchester,C=GB;
 *     on URL: https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css]
 */

public class MyWebViewClient extends WebViewClient {
    @Override
    public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
        Timber.d("onReceivedSslError called with: error = [%s]", error);
        // Impl from: https://stackoverflow.com/a/37851959/1954497
        CertificateFactory cf;
        try {
            cf = CertificateFactory.getInstance("X.509");
        } catch (CertificateException e) {
            e.printStackTrace();
            handler.cancel();
            return;
        }
        SslCertificate errorSslCertificate = error.getCertificate();
        Certificate errorX509Cert = getX509Certificate(cf, errorSslCertificate);
        if (errorX509Cert != null) {
            int[] embeddedCasResId = {R.raw.ca1, R.raw.ca2};
            boolean verified = false;
            for (int embeddedCaResId : embeddedCasResId) {
                if (verifyWithEmbeddedCertificate(view.getContext(), cf, errorX509Cert, embeddedCaResId)) {
                    verified = true;
                    break;
                }
            }
            if (verified) {
                handler.proceed();
            } else {
                handler.cancel();
            }
        } else {
            handler.cancel();
        }
    }
}