AudioMIDlet.java Source code

Introduction

Here is the source code for AudioMIDlet.java

Source

/*
Wireless Java 2nd edition 
Jonathan Knudsen
Publisher: Apress
ISBN: 1590590775 
*/
import java.io.*;

import javax.microedition.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import javax.microedition.media.*;

public class AudioMIDlet extends MIDlet implements CommandListener, Runnable {
    private Display mDisplay;
    private List mMainScreen;

    public void startApp() {
        mDisplay = Display.getDisplay(this);

        if (mMainScreen == null) {
            mMainScreen = new List("AudioMIDlet", List.IMPLICIT);

            mMainScreen.append("Via HTTP", null);
            mMainScreen.append("From resource", null);
            mMainScreen.addCommand(new Command("Exit", Command.EXIT, 0));
            mMainScreen.addCommand(new Command("Play", Command.SCREEN, 0));
            mMainScreen.setCommandListener(this);
        }

        mDisplay.setCurrent(mMainScreen);
    }

    public void pauseApp() {
    }

    public void destroyApp(boolean unconditional) {
    }

    public void commandAction(Command c, Displayable s) {
        if (c.getCommandType() == Command.EXIT)
            notifyDestroyed();
        else {
            Form waitForm = new Form("Loading...");
            mDisplay.setCurrent(waitForm);
            Thread t = new Thread(this);
            t.start();
        }
    }

    public void run() {
        String selection = mMainScreen.getString(mMainScreen.getSelectedIndex());
        boolean viaHttp = selection.equals("Via HTTP");

        if (viaHttp)
            playViaHttp();
        else
            playFromResource();
    }

    private void playViaHttp() {
        try {
            String url = getAppProperty("AudioMIDlet-URL");
            Player player = Manager.createPlayer(url);
            player.start();
        } catch (Exception e) {
            showException(e);
            return;
        }
        mDisplay.setCurrent(mMainScreen);
    }

    private void playFromResource() {
        try {
            InputStream in = getClass().getResourceAsStream("/relax.wav");
            Player player = Manager.createPlayer(in, "audio/x-wav");
            player.start();
        } catch (Exception e) {
            showException(e);
            return;
        }
        mDisplay.setCurrent(mMainScreen);
    }

    private void showException(Exception e) {
        Alert a = new Alert("Exception", e.toString(), null, null);
        a.setTimeout(Alert.FOREVER);
        mDisplay.setCurrent(a, mMainScreen);
    }
}