www.pudn.com > jlayermp3midlet.rar > MyPlayerMIDlet.java
package player;
import java.io.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.media.*;
import javazoom.jlme.decoder.*;
/*
* MyPlayerMIDlet
*
*/
public class MyPlayerMIDlet extends MIDlet implements CommandListener, ItemStateListener, PlayerListener {
//--------------------------------------------------------------------------------------------
// Forms
//--------------------------------------------------------------------------------------------
private Display display;
private List selectFilesForm =new List("Open a Mp3 file (WavToMp3://)",Choice.IMPLICIT);
private Form playerForm =new Form("Mp3 Decoder");
private Alert alert =new Alert("Wait Please...");
//--------------------------------------------------------------------------------------------
// Commands
//--------------------------------------------------------------------------------------------
private Command exitCommand = new Command("Exit",Command.EXIT,1);
private Command selectCommand = new Command("Ok",Command.OK,1);
private Command stopCommand = new Command("Stop",Command.ITEM,3);
private Command playCommand = new Command("Play",Command.ITEM,2);
private Command bufCommand = new Command("Buffering",Command.ITEM,2);
private Command prefetchCommand = new Command("Prefetch",Command.ITEM,1);
private Command prefetchBufCommand = new Command("Prefetch/Buffering",Command.ITEM,1);
private Command prefetchPlayCommand = new Command("Prefetch/Play",Command.ITEM,1);
private Command backCommand = new Command("Back",Command.BACK,1);
private ChoiceGroup commentsChoice=new ChoiceGroup("Comments : ",Choice.POPUP);
private StringItem detailsText=new StringItem("Details\n",null);
private TextField bufferText=new TextField("Buffer Size (byte)",null,15,TextField.NUMERIC);
private StringItem aboutText=new StringItem("About Mp3Decoder\n","Mp3Decoder decodes any MP3 files encoded in MPG LayerIII. It converts the file into a pcm stream thanks to JavaLayer and adds a WAV Header in order to create a well-defined WAV stream. Then, it uses the Datasource & WAV Player from MMAPI for respectively transfering and playing.");
//--------------------------------------------------------------------------------------------
// Needed for decoding and playing (Datasource Mp3ToWav & Payer WAV)
//--------------------------------------------------------------------------------------------
private Player player;
private Mp3ToWav dataSource;
private InputStream stream;
private String file;
//--------------------------------------------------------------------------------------------
// Constructor,StartApp,DestroyApp
//--------------------------------------------------------------------------------------------
public MyPlayerMIDlet() {
super();
// don't do anything in the constructor
}
public void startApp() {
/*
* selectFilesForm
*/
selectFilesForm.append("test.mp3",null); // add some audio files ...
selectFilesForm.addCommand(exitCommand); // add the commands
selectFilesForm.addCommand(selectCommand); // add the commands
selectFilesForm.setCommandListener(this); // add the listener
/*
* PlayerForm
*/
commentsChoice.append("Yes",null);
commentsChoice.append("No",null);
playerForm.append(commentsChoice);
playerForm.append(detailsText);
playerForm.append(aboutText);
playerForm.addCommand(backCommand); // add the commands
playerForm.addCommand(stopCommand);
playerForm.addCommand(playCommand);
playerForm.addCommand(prefetchCommand);
playerForm.setCommandListener(this); // add the listenrs
playerForm.setItemStateListener(this);
/*
* Display
*/
display = Display.getDisplay(this);
display.setCurrent(selectFilesForm);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public boolean createPlayer() throws Exception {
System.out.println("Enter createPlayer");
/*
try {
InputStream is = getClass().getResourceAsStream("/res/end.wav");
player = Manager.createPlayer(is,"audio/x-wav");
//player.start();
}
catch (Exception e) {
System.out.println("Cannot open the file end.wav!"
+ e.getMessage() + "/" + e.getClass());
display.setCurrent(
new Alert(
"createPlayer错误",
"Cannot open end.wav/" + e.getClass(),
null, AlertType.ERROR)
);
dataSource.setConnected(false);
player.close();
e.printStackTrace();
return false;
}
*/
// Create the DataSource called Mp3ToWav in order to interface JavaLayerDecoder and MMAPI Players
dataSource = new Mp3ToWav("/res/" + file,true);
setComments();
bufferText.setString(Integer.toString(dataSource.getBufferSize()));
// Connect the dataSource to the Source file --> DataSource ready for buffering the wav decoded stream
dataSource.connect();
/*
* http://www.javazoom.net/services/forums/viewMessage.jsp?message=12045&thread=3541&parent=11355&forum=7
* 说道"You can see, that the connect() method of the class Mp3ToWav (dataSource) is called directly from here.
But this will called later by Player in the background, so that makes some failure,
like this ArrayIndexOFBoundException.
I think the solution is:
Make comment from the dataSource.connect(); line!
//dataSource.connect();
"
我来试试看。 确实可以！！否则在播放的时候始终会得到
“"Exception in thread prodthread"”的异常!
*/
// Open the file
try {
//if(dataSource != null)
{
// Create a new player from the Mp3ToWav DataSource
System.out.println("Begin createPlayer!");
player = Manager.createPlayer(dataSource);
System.out.println("End createPlayer!");
if(player != null)
player.addPlayerListener(this);
else
{
System.out.println("Failed on createPlayer!");
dataSource.setConnected(false);
player.close();
return false;
}
}
//else
//{
// System.out.println("无法加载到music数据源!");
//}
}
catch (Exception e) {
/*
* 发生的异常为
* MMA : Exception during remote invocation
Cannot open the file with the Mp3ToWav datasource!
null/class javax.microedition.media.MediaException
*/
System.out.println("Cannot open the file with the Mp3ToWav datasource!"
+ e.getMessage() + "/" + e.getClass());
display.setCurrent(
new Alert(
"createPlayer错误",
"Cannot open the file with the Mp3ToWav datasource/" + e.getClass(),
null, AlertType.ERROR)
);
dataSource.setConnected(false);
player.close();
e.printStackTrace();
return false;
}
return true;
}
/**********************************************************
// setCurrent()
//
// Description:
// 设置当前显示的界面
//
// Parameters:
// Return Values:
// Author:
// zhengyun@ultrapower 2005.10.07
//
**********************************************************/
public void setCurrent(Alert alert, Displayable disp){
this.setCurrent(alert, disp);
}
/*
* Display some comments about the Mp3 file (name, bitRate, Number of Channels... )
*/
private void detailsFile() {
detailsText.setText("File : " + file + "\n" + dataSource.getDetails());
}
/*
* Set the way of displaying the comments
*/
private void setComments() {
if (commentsChoice.getSelectedIndex()==0) {
dataSource.setComments(true);}
else {
dataSource.setComments(false);}
}
//--------------------------------------------------------------------------------------------
// Listeners (Commands and Items)
//--------------------------------------------------------------------------------------------
public void playerUpdate(Player p, String event, Object eventData) {
if (event==PlayerListener.CLOSED) {
display.setCurrent(selectFilesForm);
}
}
public void itemStateChanged(Item item) {
if (item== commentsChoice) {
setComments();
}
if (item== bufferText) {
dataSource.setBufferSize(Integer.valueOf(bufferText.getString()).intValue());
}
}
public void commandAction(Command c,Displayable s) {
try{
if (c == exitCommand) {
destroyApp(true);
notifyDestroyed();
}
else if (c == prefetchCommand) {
// Pretech the file (Transfert the file header)
player.prefetch();
// modify the available commands
playerForm.removeCommand(prefetchCommand);
playerForm.removeCommand(prefetchBufCommand);
playerForm.removeCommand(prefetchPlayCommand);
playerForm.addCommand(playCommand);
playerForm.addCommand(bufCommand);
}
else if (c == prefetchBufCommand) {
// Pretech the file (Transfert the file header)
player.prefetch();
// Start buffering (Mp3ToWav DataSource - depends on the size of the buffer)
dataSource.startBuffering();
// modify the available commands
playerForm.removeCommand(prefetchCommand);
playerForm.removeCommand(prefetchBufCommand);
playerForm.removeCommand(prefetchPlayCommand);
playerForm.addCommand(playCommand);
}
else if (c == prefetchPlayCommand) {
// Pretech the file (Transfert the file header)
player.prefetch();
// Start Playing
player.start();
// modify the available commands
playerForm.removeCommand(prefetchCommand);
playerForm.removeCommand(prefetchBufCommand);
playerForm.removeCommand(prefetchPlayCommand);
playerForm.addCommand(stopCommand);
}
else if (c == playCommand) {
// Start Playing
player.start();
// modify the available commands
playerForm.removeCommand(playCommand);
playerForm.removeCommand(bufCommand);
playerForm.addCommand(stopCommand);
}
else if (c == stopCommand) {
// Stop Playing (Pause)
player.stop();
// modify the available commands
playerForm.removeCommand(stopCommand);
playerForm.addCommand(playCommand);
playerForm.addCommand(bufCommand);
}
else if (c == bufCommand) {
// Start buffering (Mp3ToWav DataSource - depends on the size of the buffer)
dataSource.startBuffering();
// modify the available commands
playerForm.removeCommand(stopCommand);
playerForm.removeCommand(bufCommand);
playerForm.addCommand(playCommand);
}
else if (c == selectCommand) {
// Create the DataSource and the Player
file = selectFilesForm.getString(selectFilesForm.getSelectedIndex());
System.out.println("选择了mp3文件" + file);
if(createPlayer())
detailsFile();
// modify the available commands
playerForm.removeCommand(stopCommand);
playerForm.removeCommand(playCommand);
playerForm.addCommand(prefetchCommand);
playerForm.addCommand(prefetchBufCommand);
playerForm.addCommand(prefetchPlayCommand);
display.setCurrent(playerForm);
}
else if (c == backCommand) {
display.setCurrent(alert);
dataSource.setConnected(false);
player.close();
}
}
catch(Exception e){
display.setCurrent(
new Alert(
"commandAction错误",
e.getMessage() + "/" + e.getClass(),
null, AlertType.ERROR));
}
}
}