J2ME for downloading Ringtones, Wallpapers etc

Question

Any inputs on how to make use of J2ME to download ringtones, wallpapers, games etc onto a mobile device + handle content management?
Thanks in advance,
Seetesh

Answer 1

import java.util.*;
import java.io.*;
import javax.microedition.io.*;
import javax.microedition.io.file.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class FileMidlet extends MIDlet implements CommandListener
private String currDirName;
private Command view = new Command("View", Command.ITEM, 1);
private Command back = new Command("Back", Command.BACK, 2);
private Command exit = new Command("Exit", Command.EXIT, 3);
private final static String UP_DIRECTORY = "..";
private final static String MEGA_ROOT = "/";
private final static String SEP_STR = "/";
private final static char SEP = '/';
public FileMidlet()
currDirName = MEGA_ROOT;
public void startApp()
boolean isAPIAvailable = false;
if (System.getProperty("microedition.io.file.FileConnection.version") != null)
isAPIAvailable = true;
try
showCurrDir();
catch (SecurityException e) {}
catch (Exception e) {}
else
StringBuffer splashText = new StringBuffer(getAppProperty("MIDlet-Name")).append("\n").append(getAppProperty("MIDlet-Vendor")).append(isAPIAvailable?"":"\nFileConnection API not available");
Alert splashScreen = new Alert(null,splashText.toString(),null,AlertType.INFO);
splashScreen.setTimeout(3000);
Display.getDisplay(this).setCurrent(splashScreen);
public void pauseApp() {}
public void destroyApp(boolean cond)
notifyDestroyed();
public void commandAction(Command c, Displayable d)
if (c == view)
List curr = (List)d;
final String currFile = curr.getString(curr.getSelectedIndex());
new Thread(new Runnable()
public void run()
if (currFile.endsWith(SEP_STR) ||
currFile.equals(UP_DIRECTORY))
traverseDirectory(currFile);
} else
showFile(currFile);
}).start();
else if (c == back)
showCurrDir();
else if (c == exit)
destroyApp(false);
void showCurrDir()
Enumeration e;
FileConnection currDir = null;
List browser;
try
if (MEGA_ROOT.equals(currDirName))
e = FileSystemRegistry.listRoots();
browser = new List(currDirName, List.IMPLICIT);
else
currDir = (FileConnection)Connector.open(
"file://localhost/" + currDirName);
e = currDir.list();
browser = new List(currDirName, List.IMPLICIT);
browser.append(UP_DIRECTORY);
while (e.hasMoreElements())
String fileName = (String)e.nextElement();
if (fileName.charAt(fileName.length()-1) == SEP)
browser.append(fileName);
else
browser.append(fileName);
browser.setSelectCommand(view);
browser.addCommand(exit);
browser.setCommandListener(this);
if (currDir != null)
currDir.close();
Display.getDisplay(this).setCurrent(browser);
catch (IOException ioe)
void traverseDirectory(String fileName)
if (currDirName.equals(MEGA_ROOT))
if (fileName.equals(UP_DIRECTORY))
// can not go up from MEGA_ROOT
return;
currDirName = fileName;
else if (fileName.equals(UP_DIRECTORY))
// Go up one directory
// TODO use setFileConnection when implemented
int i = currDirName.lastIndexOf(SEP, currDirName.length()-2);
if (i != -1)
currDirName = currDirName.substring(0, i+1);
else
currDirName = MEGA_ROOT;
else
currDirName = currDirName + fileName;
showCurrDir();
void showFile(String fileName)
try
FileConnection fc = (FileConnection)
Connector.open("file://localhost/" + currDirName + fileName);
if (!fc.exists())
throw new IOException("File does not exists");
InputStream fis = fc.openInputStream();
byte[] b = new byte[1024];
int length = fis.read(b, 0, 1024);
fis.close();
fc.close();
TextBox tb = new TextBox("View File: " + fileName, null, 1024,
TextField.ANY | TextField.UNEDITABLE);
tb.addCommand(back);
tb.addCommand(exit);
tb.setCommandListener(this);
if (length > 0)
tb.setString(new String(b, 0, length));
Display.getDisplay(this).setCurrent(tb);
catch (Exception e) {}
}