How to list root file systems in Java ME
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Overview
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: RootMIDlet.java
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.util.Enumeration;
import javax.microedition.io.file.*;
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);
form.addCommand(exitCommand);
form.setCommandListener(this);
Display.getDisplay(this).setCurrent(form);
createRootList();
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
protected void createRootList() {
form.append("Roots:\n");
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();
}
}
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