Network Player Manager : Audio Player « J2ME « Java Tutorial

1. Java Tutorial
2. J2ME
3. Audio Player

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.List;
import javax.microedition.lcdui.StringItem;
import javax.microedition.media.Manager;
import javax.microedition.media.Player;
import javax.microedition.midlet.MIDlet;

class ThreadedMIDlet extends MIDlet implements CommandListener {

  private List list = new List("Press Play", List.IMPLICIT);

  private Display display;

  private NetworkPlayerManager mgr;

  private Command cancel = new Command("Cancel", Command.CANCEL, 1);

  public ThreadedMIDlet() {
    list.addCommand(new Command("Exit", Command.EXIT, 1));
    list.addCommand(new Command("Play", Command.SCREEN, 1));

    list.setCommandListener(this);
    display = Display.getDisplay(this);
  }

  public void startApp() {
    display.setCurrent(list);
  }

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) {
  }

  public void commandAction(Command cmd, Displayable disp) {
    if (cmd.getLabel().equals("Exit")) {
      notifyDestroyed();
    } else if (cmd.getLabel().equals("Cancel")) {
      mgr.cancel();
      display.setCurrent(list);
    } else {
      try {
        mgr = new NetworkPlayerManager(display, cancel, this);
        Thread runner = new Thread(mgr);
        runner.start();
      } catch (Exception e) {
        System.err.println(e);
      }
    }
  }
}

public class NetworkPlayerManager implements Runnable {

  private Display display;

  private Form form = new Form("Network Player Manager");

  private StringItem msg = new StringItem("Please Wait ... ", null);

  private boolean cancel = false;

  private Player player = null;

  public NetworkPlayerManager(Display display, Command cancelCmd, ThreadedMIDlet parent) {
    this.display = display;
    form.append(msg);
    form.addCommand(cancelCmd);

    form.setCommandListener(parent);
  }

  public void run() {
    display.setCurrent(form);
    boolean connected = false;

    try {
      player = Manager.createPlayer("http://www.yoursite.com/s.wav");
      player.realize();
      connected = true;
    } catch (Exception e) {
      msg.setText("Failed: " + e.getMessage());
      System.err.println(e);
      return;
    }

    if (connected && !cancel)
      msg.setText("Connected. Starting playback...");
    else {
      msg.setText("Unable to connect.");
      return;
    }
    try {
      player.start();
    } catch (Exception pe) {
      msg.setText(pe.getMessage());
    }
  }
  public void cancel() {
    cancel = true;
    if (player != null)
      player.deallocate();
  }
}