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How to list root file systems in Java ME

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Created: jarmlaht (15 Feb 2008)
Last edited: hamishwillee (30 Jul 2013)


This article shows how to list currently mounted root file systems on a device. FileConnection API (JSR-75) has FileSystemRegistry.listRoots() method for this purpose.

The full source code for a test MIDlet:

Source code:

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.util.Enumeration;
public class RootMIDlet extends MIDlet implements CommandListener {
private Form form;
private Command exitCommand;
public void startApp() {
form = new Form("Root list");
exitCommand = new Command("Exit", Command.EXIT, 1);
public void pauseApp() {
public void destroyApp(boolean unconditional) {
protected void createRootList() {
Enumeration drives = FileSystemRegistry.listRoots();
while (drives.hasMoreElements()) {
String driveString = drives.nextElement().toString();
form.append(driveString + "\n");
public void commandAction(Command c, Displayable d) {
if (c == exitCommand) this.notifyDestroyed();

See also

This page was last modified on 30 July 2013, at 05:50.
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