audio recording method

armain.java

		MediaRecorder recorder = new MediaRecorder();
		recorder.reset();
		
		recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
		recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
		recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
		recorder.setOutputFile("test/tmp.3gp"); 
										
		try {
		  recorder.prepare();
		} catch (IllegalStateException e) {
		  e.printStackTrace();
		  Log.i("lala", "IllegalStateException");
		} catch (IOException e) {
		  e.printStackTrace();
		  Log.i("lala", "IOException");
		}
		recorder.start();