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Example
The following example demonstrates how to receive a text message (SMS) in an application. Study the code—the most important parts are in the startApp() method, in which the message itself is read from the system.
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import java.io.*;
import javax.wireless.messaging.*;
public class PushMIDlet extends MIDlet implements CommandListener {
private Display display;
private Command coExit;
private MessageConnection mc = null;
private Message me;
private Alert alert;
private int port = 200;
public PushMIDlet(){
System.out.println("konstruktori");
display = Display.getDisplay(this);
coExit = new Command("Exit", Command.EXIT, 1);
alert = new Alert("Message");
alert.setTimeout(Alert.FOREVER);
alert.setCommandListener(this);
}
protected void destroyApp(boolean p0){
}
protected void pauseApp() {
}
protected void startApp() throws MIDletStateChangeException {
System.out.println("startApp");
String connections[] = PushRegistry.listConnections(true);
if (connections == null || connections.length == 0){
destroyApp(false);
notifyDestroyed();
}
else {
try{
mc = (MessageConnection)Connector.open("sms://:"+port);
me = mc.receive();
if (me != null && me instanceof TextMessage){
alert.setTitle("Message from " + me.getAddress());
alert.setString(((TextMessage)me).getPayloadText());
display.setCurrent(alert);
}
} catch (IOException ioe){
System.out.println("Error in receiving message.");
}
}
}
public void commandAction(Command c, Displayable dp) {
if (c==coExit){
destroyApp(false);
notifyDestroyed();
}
}
}
And the jad file should look something like this:
MIDlet-1: PushMIDlet, PushMIDlet.png, PushMIDlet MIDlet-Jar-Size: 1835 MIDlet-Jar-URL: PushMIDlet.jar MIDlet-Name: PushMIDlet MIDlet-Push-1: sms://:200, PushMIDlet, * MIDlet-Vendor: Mikko Kontio MIDlet-Version: 1.0 MicroEdition-Configuration: CLDC-1.0 MicroEdition-Profile: MIDP-2.0
To run the example with WTK 2.0, you must create a new project, write the code, set the PushRegistry settings, and build the project. Then, you can run it via OTA (Over-The-Air) from the Project menu. After successfully installing the application, you can send an SMS (a text message) by choosing File, Utilities and then opening the WMA (Wireless Messaging API) console.