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How to get the CLDC and MIDP version from a J2ME program

By: Ivan Lim in J2ME Tutorials on 2007年09月16日 [フレーム]

The CLDC/MIDP supports system properties, which are key-value pairs that represent information about the platform and environment in which MIDP applications execute. Conceptually these are the same type of properties that you find in J2SE. Unfortunately, there is no java.util.Properties class in CLDC/MIDP to facilitate your handling of properties.

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;
public class VersionMIDlet extends MIDlet {
 private Display display;
 private Form form;
 public VersionMIDlet() {
 display = Display.getDisplay(this);
 form = new Form("CLDC and MIDP Version");
 }
 protected void startApp() {
 String cldcVersion = System.getProperty("microedition.configuration");
 String midpVersion = System.getProperty("microedition.profiles");
 form.append("CLDC Version: " + cldcVersion + "\n");
 form.append("MIDP Version: " + midpVersion + "\n");
 display.setCurrent(form);
 }
 protected void pauseApp() {}
 protected void destroyApp(boolean unconditional) {}
}

This program creates a VersionMIDlet class that extends MIDlet and overrides its lifecycle methods. In the startApp() method, it uses the System.getProperty() method to retrieve the CLDC and MIDP version information and displays them in a form. Finally, it sets the form as the current display using the Display.setCurrent() method. When you run the program, it displays the CLDC and MIDP version information on the screen.

You can also get other properties like below.

platform = System.getProperty("microedition.platform");
System.out.println(platform);
encoding = System.getProperty("microedition.encoding");
System.out.println(encoding);
locale = System.getProperty("microedition.locale");
System.out.println(locale);

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