问如何在tts说话时停止语音识别？

EN

private class MiTareaAsincronaDialog extends AsyncTask<Void, Integer, Boolean> {

    @Override
    protected Boolean doInBackground(Void... params) 
    {
        String words = "Esto es una prueba del texto pasado a oral";
        speakWords(words);
        while(myTTS.isSpeaking() == true)
        {

            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

        return true;
    }

    @Override
    protected void onProgressUpdate(Integer... values) {
    }

    @Override
    protected void onPreExecute() {
    }

    @Override
    protected void onPostExecute(Boolean result) {

        Toast.makeText(MainActivity.this, "Tarea finalizada!",
                Toast.LENGTH_SHORT).show();
    }

    @Override
    protected void onCancelled() 
    {
        Toast.makeText(MainActivity.this, "Tarea cancelada!",
    Toast.LENGTH_SHORT).show();
    }
}