how to do recording and playback in the device ?

Hi,
I am tried to do recording and playback .its working in the simulator but not in the device .
so please go through my code .Please suggest me what i need to change in my code.

Code:

void MyTajweedScr::toggleRecord()
{
     QString fileName;
    if (capture->state() == QMediaRecorder::StoppedState)
    {
 
        if (!outputLocationSet)
       //     capture->setOutputLocation(generateAudioFilePath());
 
       // QAudioEncoderSettings settings;
 
         QAudioEncoderSettings audioSettings;
 
 
          capture->setEncodingSettings(audioSettings);
          capture->setOutputLocation(QUrl::fromLocalFile(fileName));
          capture->record();
      }
 
    else
    {
        capture->stop();
    }
}
void MyTajweedScr::setOutputLocation()
{
    QString fileName =QFileDialog::getSaveFileName();//"E:/New folder/Project6 - Copy/IQRAV1/song/text.pcm";////;
    capture->setOutputLocation(QUrl(fileName));
    outputLocationSet = true;
}
void MyTajweedScr::on_Record_tb_clicked()
{
 
    setOutputLocation();
 toggleRecord();
}

Regards,
Arpita