webview.setWebViewClient(new WebViewClient() {
  @Override
  public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
	if (error.getPrimaryError() == SslError.SSL_DATE_INVALID // 日期不正確
  		|| error.getPrimaryError() == SslError.SSL_EXPIRED // 日期不正確
  		|| error.getPrimaryError() == SslError.SSL_INVALID // webview BUG
  		|| error.getPrimaryError() == SslError.SSL_UNTRUSTED) { // 根證書丟失
  		if (chkMySSLCNCert(error.getCertificate())) {
		    handler.proceed(); // 如果證書一致，忽略錯誤
  		}
	}
  }
  
  private boolean chkMySSLCNCert(SslCertificate cert) {
	byte[] MySSLCNSHA256 = { 35, 76, 110, -121, -68, -104, -12, 84, 39, 119, -55,
  		101, 95, -8, -90, 9, 36, -108, 5, -57, 76, -98, -19, -73, 91, -37, 18,
  		64, 32, -41, 0, 109 }; //證書指紋
  	Bundle bundle = SslCertificate.saveState(cert);
  	byte[] bytes = bundle.getByteArray("x509-certificate");
  	if (bytes != null) {
  		try {
	      CertificateFactory cf = CertificateFactory.getInstance("X.509"); 
	      Certificate ca = cf.generateCertificate(new ByteArrayInputSteam(bytes)); 
	      MessageDigest sha256 = MessageDigest.getInstance("SHA-256");
	      byte[] Key = sha256.digest(((X509Certificate) ca).getEncoded());
	      return Arrays.equals(key, MySSLCNSHA256);
  		} catch (Exception Ex) {}
  	}
  	return false;
  }
}