/****
     * Method to start the record of the patient, for the current exercise.
     * Synchornized method because of the thread which is send a message every 2 seconds to detect
     * a sound presence or not.
     * If not : call to stopRecord method
     * @param path
     */
    public synchronized void beginRecord(String path){

        Log.i(TAG, "beginRecord" );
        if (!recorderRunning){
            recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
            recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
            recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
            recorder.setOutputFile(path);
            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();   // Recording is now started
            recorderRunning = true;
        }
    }

    /***
     * Method to stop the recorder, when there is no sound to detect
     */
    public synchronized void stopRecord(){
        Log.i(TAG, "stopRecord" );
        if (recorder != null && recorderRunning){
            recorder.stop();
            recorder.reset();
            // You can reuse the object by going back to setAudioSource() step
            //recorder.release(); // Now the object cannot be reused
            Toast.makeText(this, "Ending of recording", Toast.LENGTH_SHORT).show();
            activeThread = true;
            Log.i("StopRecord", "Active thread true");
            recorderRunning =false;
            currentAmplitude = INIT_VALUE;
        }

    }

    /***
     * Method run of the thread. It is sending a message to the handler every 2 sec.
     */
    @Override
    public void run() {
        // TODO Auto-generated method stub
        try {
            activeThread = true;
            while(activeThread){
                Log.i(TAG, "onRun()" );
                Thread.sleep(2000);
                threadHandler.sendEmptyMessage(0);

            }
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


    }


    /***
     * Handler receives the message from the thread, and modify the UIThread as needed
     * Focused on the detection of the amplitude
     */
    private Handler threadHandler = new Handler() {
        public void handleMessage(android.os.Message msg) {
            Log.i(TAG, "handleMessage" );
            int previousValue = currentAmplitude;
            Log.i(TAG, "handleMessage : previous value : "+Integer.toString(currentAmplitude) );
            currentAmplitude = recorder.getMaxAmplitude();
            Log.i(TAG, "handleMessage : MaxAmplitude : "+Integer.toString(currentAmplitude) );
            if (previousValue < AMPLITUDE_END && currentAmplitude < AMPLITUDE_END && recorder != null){
                Log.i(TAG, "handleMessage under 300" );
                stopRecord();
            }

        }

    };


PS : The activity has to implements the Runnable interface.