mediaRecorder.prepare（）; IOEXCEPTION错误

Question

实际上我正在尝试使用mediarecorder录制语音通话。我的代码适用于某些设备，但像lenovo索尼一样，它不起作用。调用IOEXCEPTION时出现mediarecorder.prepare()错误。这是我的代码

{
  cou = 1;
  String nam = "/"+name+"("+cou+")"+".wav";
  String voicefile = recordfolder + nam ;
  File vf = new File(voicefile);
  while (vf.exists()) {
    cou = cou + 1;
    nam = "/"+name+"("+cou+")"+".wav";
    voicefile = recordfolder + nam ;
    vf = new File(voicefile);
    System.out.println("cou valuee"+cou);
  }
  System.out.println("cou value isssssss" + cou);
  voicefile = recordfolder + nam ;
  try {
    mymediarecorder();
  }
  catch (Exception e {
    System.out.println("error to run mediarecorder function");
  }
  try {
    myAudioRecorder = new MediaRecorder();
    myAudioRecorder.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL);
    myAudioRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    myAudioRecorder.setOutputFile(voicefile);
    myAudioRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    System.out.println("audio file setup done");
  }
  catch (Exception e)
  {
    System.out.println("now problem hereee");
  }
  try {
    myAudioRecorder.prepare();
  }
  catch (IllegalStateException e) {
    System.out.println("problem to prepare .wav");
  }
  catch (IOException e) {
    System.out.println("problem to prepare .wav IOEXCEPTION ");
  }
  myAudioRecorder.start();
}