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WMAPI allows Java ME applications to access messaging functionalities, as sending and receiving SMS and MMS messages. This article explains how to use it to send a simple text message.

Contents 1 Source code 1.1 Download 1.2 Notes 2 Related resources

Source code

The following Java ME tip explains a method of sending text messages . In the program TextMessage interface represents a text message. The setPayloadText() method sets the characters in the message.

public boolean sendSms(String number, String message){
    boolean result = true;
    try {
      //sets address to send message
      String addr = "sms://"+number;
      // opens connection
      MessageConnection conn = (MessageConnection) Connector.open(addr);
      // prepares text message
      TextMessage msg =
      (TextMessage)conn.newMessage(MessageConnection.TEXT_MESSAGE);
      //set text
      msg.setPayloadText(message);
      // send message
      conn.send(msg);
      conn.close();
    } catch (SecurityException se) {
        // probably the user has not allowed to send sms
        // you may want to handle this differently
        result = false;
    } catch (Exception e) {
        result = false;
    }
    return result;
  }

Download

You can download a sample MIDlet showing the code presented in this article here: Media:HowToSendTextSMSMIDlet.zip

Notes

• Remember that a single message has a maximum size (140 bytes, which translates to 160 7-bit characters). If your message is too long to fit in one message it can be splitted to a maximum of three SMS, this is handled automatic by the WMA implementation.
• Potentially-blocking operations, like sending a text message, should always be performed in separate threads, to avoid blocking the main MIDlet thread.

Related resources

• WMAPI JavaDocs
• Wireless messaging section on Java ME Developer's Library