J2ME media player doesn't play

Question

public class Midlet extends MIDlet implements CommandListener{

  Player p;

  public void startApp() {
      Display.getDisplay(this).setCurrent(new SongsList(this));
  }

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) {
      notifyDestroyed();
  }

  public void commandAction(Command cmnd, Displayable dsplbl) {
      if (cmnd.getLabel().equals("Exit"))
      {
          destroyApp(true);
      }
      else
      {
          try {
              //InputStream is = getClass().getResourceAsStream("/res/getlucky.mpeg");
              //p = Manager.createPlayer(is, "audio/mpeg");
              p = Manager.createPlayer("http://puu.sh/6n9jC.mp3");
              p.realize();
              p.start();
          } catch (IOException ex) {
              ex.printStackTrace();
          } catch (MediaException ex) {
              ex.printStackTrace();
          }  
      }
  }
}

this is the songslist class :

public class SongsList extends List{

public SongsList(Midlet midlet)
{
    super("Songs", List.IMPLICIT);
    append("get lucky", null);
    addCommand(new Command("Exit", Command.EXIT, 0));
    addCommand(new Command("Select", Command.OK, 0));
    setCommandListener(midlet);
}

}

tried use via file stored in project (its under src/res):

inputStream = getClass().getResourceAsStream("res/getlucky.mpg");
audioPlayer = Manager.createPlayer(inputStream, "audio/mpg");

as well as from HTTP:

//audioPlayer = Manager.createPlayer("http://puu.sh/6n9jC.mp3");

Nothing works, what am I doing wrong?

EDIT: I've tried to delete my application and just copy paste it to a new project and it worked for some reason.. now I encounter new problems: 1) I try to play a song - this is the link http://puu.sh/6n9jC.mp3 its not playing so I guess there's a limited file size for what can be played can someone tell me what is this limit ? 2) Im trying to record the audio with RecordPlayer but its always null

public AudioAnalyzer()
{
    try {
        thread = new Thread(this);
        recordFinished = false;
        //inputStream = getClass().getResourceAsStream("res/getlucky.mpg");
        //audioPlayer = Manager.createPlayer(inputStream, "audio/mpg");
        audioPlayer = Manager.createPlayer("http://puu.sh/35YTG.mp3");
        //audioPlayer = Manager.createPlayer("http://puu.sh/6n9jC.mp3");
        audioPlayer.realize();
        System.out.println(System.getProperty("supports.audio.capture"));
        recordControl = (RecordControl)audioPlayer.getControl("RecordControl");
        recordOutput = new ByteArrayOutputStream();
        recordControl.setRecordStream(recordOutput);
        recordControl.startRecord();
        audioPlayer.start();
        //thread.start();
    } catch (MediaException ex) {
        ex.printStackTrace();
    } catch (IOException ex) {
        ex.printStackTrace();
    }
}

I even tried to print if the system is supporting audio capture and the result were true but I get NullPointException at this line :

recordOutput = new ByteArrayOutputStream();

although I tried to get the recordcontrol from the player it is still null :

recordControl = (RecordControl)audioPlayer.getControl("RecordControl");

I think I read that it'll always give NullPointerException unless you run it on a real device and not an emulator is that true ? can someone verify it ? and if so what can I do if I don't own a device currently any other way to use recordcontrol feature in emulator (assuming recordcontrol isn't working on emulators).

Thanh Le Thanh Le · Accepted Answer · 2014-01-17T03:16:37

File size is 8MB (maybe play on your phone), try to this code

public void initMedia(final String aFileUrl) {
        if (m_player == null) {
            try {
                m_player = Manager.createPlayer(aFileUrl);
                m_player.addPlayerListener(this);
                m_player.realize();
                m_player.prefetch();
                m_volumeControl = (VolumeControl) m_player.getControl("VolumeControl");                
            } catch (IOException ex) {
            } catch (Exception ex) {
            } catch (OutOfMemoryError e) {
            }
        }
    }

In your code, i guess you miss "m_player.prefetch()", try this. And print your Exception message...

This code in general for file, resourcce, http...

public void initMedia(final String aProtocol, final String aMediaSource) {
    if (m_player == null) {
        try {
            if (aMediaSource.indexOf("file://") == 0) {
                InputStream iRecordStream = Connector.openInputStream(aMediaSource);
                m_player = Manager.createPlayer(iRecordStream, "audio/amr");
            } else {
                m_player = Manager.createPlayer(aProtocol);
            }
            m_player.addPlayerListener(this);
            m_player.realize();
            boolean isPrefetch = true;
            try {
                m_player.prefetch();
            } catch (Exception ex) {
                isPrefetch = false;
            }
            // trick to pass prefetch error
            if (!isPrefetch) {
                if (m_player != null) {
                    m_player.close();
                    m_player = null;                        
                }
                if (aMediaSource.indexOf("file://") == 0) {
                    InputStream iRecordStream = Connector.openInputStream(aMediaSource);
                    m_player = Manager.createPlayer(iRecordStream, "audio/amr");
                } else {
                    m_player = Manager.createPlayer(aProtocol);
                }
                m_player.addPlayerListener(this);
                m_player.realize();
                m_player.prefetch();
            }                

            m_volumeControl = (VolumeControl) m_player.getControl("VolumeControl");                
        } catch (IOException ex) {
        } catch (Exception ex) {
        } catch (OutOfMemoryError e) {
        }
    }
}

J2ME media player doesn't play

2 Answers