Apps How to create sdcard in emulater to save recorded file??

[ambblr108]

Hi all,
i am beginner in android development.i am trying to recording on button click.

mycode is following::

private void StartAudioRecording() {
		File sampleDir=Environment.getExternalStorageDirectory();
		try {
			audioFile=File.createTempFile("sound","3gp",sampleDir);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
		recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
		recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
		recorder.setOutputFile(audioFile.getAbsolutePath());
		try {
			recorder.prepare();
		} catch (IllegalStateException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		recorder.start();
	}

when i was runnig applicayion in debug mode application getting crash.pls tell me what is wrong in this code.....
iam not getting sdcard path .

pls help me how to sove my issue.

thanks in advance
Ambrish Singh