Writing MIDlet for SMS - I

9 April 2008

SMS stands for Short Messaging Service and it is very common in mobile communication. J2ME provides an API for SMS which makes messaging very easy.

I will write a MIDlet to show how to create a messaging system using javax.wireless.messaging.
First step is to import all the required APIs:

import javax.microedition.midlet.*;
import javax.microedition.io.*;
import javax.microedition.lcdui.*;
import javax.wireless.messaging.*;
import java.io.IOException;

MIDlet class should extend MIDlet class. Since it will be a multithreaded application, we need to implement Runnable interface. To provide action listeners, we will also implement CommandListener and MessageListener interfaces.

public class SMSReceive extends MIDlet
implements CommandListener, Runnable, MessageListener {

Now we may declare the commands we want to have in our MIDlet.

/** user interface command for indicating Exit request. */
Command exitCommand = new Command("Exit", Command.EXIT, 2);
/** user interface command for indicating Reply request */
Command replyCommand = new Command("Reply", Command.OK, 1);
/** user interface text box for the contents of the fetched URL. */