Exception during Audio recording

Hello

I am trying to create a screen where the user can start and the voice to stop recording.

Start button will start the recording of the voice, where as stop stop recording and store the voice record.

I looked for Ko Javadevelopment and found some code and changed according to my understanding (as the code is available in pieces).

When I press the Start Recording button, I get an exception "java.lang.ClassCastException.

Can you please help me to solve the same.

I'm pasting my entire code here for your reference.

package comp;

import java.io.IOException;

import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.container.HorizontalFieldManager;
import net.rim.device.api.ui.container.MainScreen;

public class myAudio extends MainScreen {
    private ButtonField _startRecordingButton;
    private ButtonField _stopRecordingButton;
    private HorizontalFieldManager _fieldManagerButtons;
    private VoiceNotesRecorderThread _voiceRecorder;
    private LabelField _myAudioTextField;

    public myAudio() {
        _startRecordingButton = new ButtonField("Start Recording");
        _stopRecordingButton = new ButtonField("Stop Recording");
        _fieldManagerButtons = new  HorizontalFieldManager();
        _voiceRecorder = new VoiceNotesRecorderThread(5000,"file:///store/home/user/myfile.amr",this);
        _voiceRecorder.start();

        myButtonFieldChangeListener buttonFieldChangeListener = new myButtonFieldChangeListener();
        _startRecordingButton.setChangeListener(buttonFieldChangeListener);
        _stopRecordingButton.setChangeListener(buttonFieldChangeListener);      

        _fieldManagerButtons.add(_startRecordingButton);
        _fieldManagerButtons.add(_stopRecordingButton);

        _myAudioTextField = new LabelField(" Hello..." );
        add(_fieldManagerButtons);
        add(_myAudioTextField);
    }

    public void setAudioTextField(String text) {
        _myAudioTextField.setText(text);
    }

    class myButtonFieldChangeListener implements FieldChangeListener{
        public void fieldChanged(Field field, int context) {
            if(field == _startRecordingButton) {
                try {
                    _voiceRecorder.startRecording();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }else if(field == _stopRecordingButton) {
                _voiceRecorder.stopRecording();
            }
        }
    }
}

package comp;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import javax.microedition.io.Connector;
import javax.microedition.io.file.FileConnection;
import javax.microedition.media.Manager;
import javax.microedition.media.Player;
import javax.microedition.media.control.RecordControl;

import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.container.MainScreen;

public class VoiceNotesRecorderThread extends Thread
{
   private Player _player;
   private RecordControl _rcontrol;
   private ByteArrayOutputStream _output;
   private byte _data[];
   private int recordSizeLimit;
   private String recordFileName;
   private myAudio myAudioScreen;
   private FileConnection fileConn;

   VoiceNotesRecorderThread(int limit, String filePath, myAudio screen) {
       fileConn = null;
       recordSizeLimit = limit;
       recordFileName = filePath;
       myAudioScreen = screen;
   }

   private int getSize()
   {
       return (_output != null ? _output.size() : 0);
   }

   private byte[] getVoiceNote()
   {
      return _data;
   }

//  public void run() {
//      while(true){
//          synchronized (UiApplication.getEventLock()) {
//              myAudioScreen.setAudioTextField(" Running Thread...");
//          }
//      }
//  }

    public boolean startRecording() throws IOException {

        _output = null;
        _rcontrol = null;
        _player = null;

        try {
            synchronized (UiApplication.getEventLock()) {
                myAudioScreen.setAudioTextField(" Start Recording...");
            }                

            fileConn = (FileConnection) Connector.open(recordFileName);

            if (fileConn.exists()) {
                fileConn.delete();
                synchronized (UiApplication.getEventLock()) {
                    Dialog.inform(" File: File is already available" );
                }
            }
            fileConn.close();

            fileConn = (FileConnection) Connector.open(recordFileName, Connector.WRITE );
            fileConn.create();
            _output = (ByteArrayOutputStream) fileConn.openOutputStream();

            //Create a ByteArrayOutputStream to capture the audio stream.
            //_output = new ByteArrayOutputStream();
            // Create a Player that captures live audio.
            _player =  Manager.createPlayer("capture:///audio?encoding=audio/amr");
            _player.realize();

            synchronized (UiApplication.getEventLock()) {
                Dialog.inform(" Player is Created" );
            }
            // Get the RecordControl, set the record stream,
            _rcontrol = (RecordControl)_player.getControl("RecordControl");
            _rcontrol.setRecordSizeLimit(recordSizeLimit);
            //_rcontrol.setRecordLocation(pathToRecording);
            _rcontrol.setRecordStream(_output);
            _rcontrol.startRecord();
            _player.start();
            synchronized (UiApplication.getEventLock()) {
                Dialog.inform(" Player is Started" );
            }
            //_output.reset();
            //_player.addPlayerListener(playerListen);
        }
        catch ( Exception e) {
            if(fileConn != null) {
                fileConn.delete();
                fileConn.close();
            }
            synchronized (UiApplication.getEventLock()) {
                Dialog.inform(" StartRecording: Exception "+ e.toString() );
            }
            return false;
        }
        return true;
    }

    public void stopRecording() {
        try {
            synchronized (UiApplication.getEventLock()) {
                myAudioScreen.setAudioTextField(" Stop Recording...");
            }

            if(_rcontrol != null) {
                _rcontrol.commit();
            }
            else {
                synchronized (UiApplication.getEventLock()) {
                    Dialog.inform(" _rcontrol is null " );
                }
            }
            if(_output != null) {
                //_output.flush();

                if(!(_output.size() >0) ) {
                    synchronized (UiApplication.getEventLock()) {
                        Dialog.inform(" _output buffer empty " );
                    }
                }
                _data = _output.toByteArray();
                _output.close();
            }
            if(!(_data.length > 0)) {
                synchronized (UiApplication.getEventLock()) {
                    Dialog.inform(" Data gone baby gone " );
                }
            }
            if(_player != null) {
                _player.close();
                _player = null;
            }
        }
        catch (final Exception e) {
            synchronized (UiApplication.getEventLock()) {
                Dialog.inform(" Stop recording Failed:  " + e.toString());
            }
            return;
            //Dialog.inform(e.toString());
        }
    }

    class FieldListener implements FieldChangeListener {
        Object recordButtonField = null;
        Object stopRecordingButtonField = null;

        public void fieldChanged(Field field, int context) {
            if(field.equals(recordButtonField)) {
                try {
                    startRecording();
                } catch (IOException e) {
                    synchronized (UiApplication.getEventLock()) {
                        Dialog.inform(" Start Button Exception:  " + e.toString());
                    }
                    //e.printStackTrace();
                }
                /*recording only occurs during the sleep*/
            } else if(field.equals(stopRecordingButtonField)) {
                stopRecording();
            }
        }
    }
}

_player = Manager.createPlayer ("capture://audio?encoding=audio/amr");

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try{
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