public void onReceivedSslError(WebView view,final SslErrorHandler handler,
  SslError error) {
      final AlertDialog.Builder builder = new AlertDialog.Builder(WebViewActivity.this);
      String message = "SSL Certificate error.";
      switch (error.getPrimaryError()) {
        case SslError.SSL_UNTRUSTED:
          message = "The certificate authority is not trusted.";
          break;
        case SslError.SSL_EXPIRED:
          message = "The certificate has expired.";
          break;
        case SslError.SSL_IDMISMATCH:
          message = "The certificate Hostname mismatch.";
          break;
        case SslError.SSL_NOTYETVALID:
          message = "The certificate is not yet valid.";
          break;
        case SslError.SSL_DATE_INVALID:
          message = "The date of the certificate is invalid";
          break;
        case SslError.SSL_INVALID:
        default:
          message = "A generic error occurred";
          break;
      }
      message += " Do you want to continue anyway?";

      builder.setTitle("SSL Certificate Error");
      builder.setMessage(message);

      builder.setPositiveButton("continue", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
          handler.proceed();
        }
      });
      builder.setNegativeButton("cancel", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
          handler.cancel();
        }
      });
      final AlertDialog dialog = builder.create();
      dialog.show();
 }