如何使用Java将Twilo作为MMS发送PDF？

Question

我可以发送带有图形图像（* .jpg）的彩信，并在我的Android手机上查看。但是，当我尝试PDF时，PDF文件不显示我的手机。我发送到iPhone，但接收短信应用程序说它无法处理传入的PDF。 我是NodeJS样本，有一个属性：'mediaContentType：“pdf”'。我在Java中没有注意到它。 How to Send Pdf as MMS by Twilo Using Nodejs?

  package twilio;
  import com.twilio.Twilio;
  import com.twilio.rest.api.v2010.account.Message;
  import com.twilio.type.PhoneNumber;
  import java.net.URI;
  import java.net.URISyntaxException;

  public class SendMsgMMS {
    public static final String ACCOUNT_SID = "<my Twilio SID>";
    public static final String AUTH_TOKEN = "<my Twilio Auth code>";
    public static void main(String[] args) throws URISyntaxException {
    Twilio.init(ACCOUNT_SID, AUTH_TOKEN);
    String fromPhoneNumber = "+11231231234";
    String toPhoneNumber = "+15551231234";
    Message message = Message.creator(
              new PhoneNumber(toPhoneNumber),
              new PhoneNumber(fromPhoneNumber),
              "Sample PDF"
            )
              .setMediaUrl(new URI("http://tigerfarmpress.com/books/download/HyperCubes02vSa.pdf"))
              .create();
    System.out.print("+ from:" + message.getFrom());
    System.out.print(", to:" + toPhoneNumber);
    System.out.print(", " + message.getSid());
    System.out.print(", " + message.getBody());
    System.out.println("");
}

}