i can store video file in SDcard but it is 0bytes im unable to record video it always showing 0bytes is there any mistake in my code please help me

Question

  package com.VideoRecord;

import java.io.File;
import java.io.IOException;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Intent;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;

public class VideoRecord extends Activity {
    /** Called when the activity is first created. */

    public MediaRecorder mrec = null;
    private Button startRecording = null;
    private Button stopRecording = null;
    private static final String TAG = "SoundRecordingDemo";
    File videofile;
    private SurfaceView sf;
    private SurfaceHolder previewHolder;


    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);



    startRecording = (Button)findViewById(R.id.startrecording);
      stopRecording = (Button)findViewById(R.id.stoprecording);

      sf = (SurfaceView) findViewById(R.id.sfpr);
      previewHolder = sf.getHolder();
      previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);



        startRecording.setOnClickListener(new View.OnClickListener(){
          public void onClick(View v) {
           try
           {
               startRecording.setEnabled(false);
               stopRecording.setEnabled(true);
               stopRecording.requestFocus();

               startRecording();
           }catch (Exception ee)
           {
               Log.e(TAG,"Caught io exception " + ee.getMessage());
           }

          }
        });

        stopRecording.setOnClickListener(new View.OnClickListener(){
          public void onClick(View v) {
              startRecording.setEnabled(true);
              stopRecording.setEnabled(false);
              startRecording.requestFocus();
              stopRecording();
              processvideofile();
          }

        });

       stopRecording.setEnabled(false);
       startRecording.setEnabled(true);

    }
    protected void processvideofile() {

        ContentValues values = new ContentValues(4);
        long current = System.currentTimeMillis();


        values.put(MediaStore.Video.Media.TITLE, "video" + videofile.getName());
        values.put(MediaStore.Video.Media.DATE_ADDED, (int) (current / 1000));
        values.put(MediaStore.Video.Media.MIME_TYPE, "audio/3gpp");
        values.put(MediaStore.Video.Media.DATA, videofile.getAbsolutePath());
        ContentResolver contentResolver = getContentResolver();

        Uri base = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
        Uri newUri = contentResolver.insert(base, values);

        // this does not always seem to work cleanly....
        sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, newUri));



      }


    protected void startRecording() throws IOException 
    {
        mrec.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
        mrec.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mrec.setVideoEncoder(MediaRecorder.VideoEncoder.H263);
//  mrec.setOutputFile(path);
        mrec.setVideoFrameRate(15);
        mrec.setVideoSize(176, 144);
        if (videofile == null) {
              File sampleDir = Environment.getExternalStorageDirectory();

              try { 
                  videofile = File.createTempFile("ived", ".3gp", sampleDir);
              } 
              catch (IOException e)
              {
                  Log.e(TAG,"sdcard access error");
                  return;
              }
        }

        mrec.setOutputFile(videofile.getAbsolutePath());

        mrec.prepare();
        mrec.start();

    }

    protected void stopRecording() {
        mrec.stop();
        mrec.reset();  
        mrec.release();
      }

   }