public class texttospeech extends Activity implements TextToSpeech.OnInitListener {
	TextToSpeech tts;
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		tts = new TextToSpeech(this,this);
	}
 
	public void onInit(int status) {
		// TODO Auto-generated method stub
		Locale loc = new Locale("es", "","");
		if(tts.isLanguageAvailable(loc) >= TextToSpeech.LANG_AVAILABLE){
			tts.setLanguage(loc);
		}
		tts.speak("hola mundo, gracias por visitar androides", TextToSpeech.QUEUE_FLUSH, null);
	}
 
	@Override
	protected void onDestroy() {
		// TODO Auto-generated method stub
		super.onDestroy();
		tts.shutdown();
	}
}

public class Main extends Activity implements TextToSpeech.OnInitListener

Create a TextToSpeech instance where the first param is the context and second is the init function (the one we implemented)
tts = new TextToSpeech(this,this);

public void onInit(int status) {

Locale loc = new Locale("es", "","");

if(tts.isLanguageAvailable(loc) >= TextToSpeech.LANG_AVAILABLE){
tts.setLanguage(loc);

tts.speak(”hola mundo, gracias por visitar androides”, TextToSpeech.QUEUE_FLUSH, null);