java - android waiting on something -

i wondering how make program pause , wait event finish before starting event, example have text speech says , right after google voice recognizer should fire, both fire @ same time , makes speech recognizer listen text speech. tried searching on here , found answers not clear me, can me it?

here example code tested out :

protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_menu);      tts=new texttospeech(getapplicationcontext(),            new texttospeech.oninitlistener() {           @suppresswarnings("deprecation")             @override           public void oninit(int status) {              if(status != texttospeech.error){                  tts.setlanguage(locale.uk);                  tts.speak("welcome", texttospeech.queue_flush, null);                 }                             }           });      if(!(tts.isspeaking())){         startvoicerecognitionactivity();     } }  private void startvoicerecognitionactivity() {     intent intent = new intent(recognizerintent.action_recognize_speech);     intent.putextra(recognizerintent.extra_language_model,             recognizerintent.language_model_free_form);     intent.putextra(recognizerintent.extra_prompt, "speak up");     startactivityforresult(intent, request_code); }  @override protected void onactivityresult(int requestcode, int resultcode, intent data) {     if (requestcode == request_code && resultcode == result_ok)     {         matches = data.getstringarraylistextra(                 recognizerintent.extra_results);         if (matches.contains("list")){                 intent gotolist = new intent(menuactivity.this, listactivity.class );                 startactivity(gotolist);         }     }     super.onactivityresult(requestcode, resultcode, data); } 

welcome wonderful world of asynchronous events.

in order want, approach not "wait" (because freeze), "listen".

when takes long in android, such text speech, have listen event.

if @ docs text speech object, you'll find accepts listener different things: http://developer.android.com/reference/android/speech/tts/texttospeech.html#setonutteranceprogresslistener(android.speech.tts.utteranceprogresslistener) , http://developer.android.com/reference/android/speech/tts/utteranceprogresslistener.html

so you'd (assuming text speech object tts):

tts.setonutteranceprogresslistener(new utteranceprogresslistener() {    public void ondone(string utteranceid) {       // text has been read, next action    }    public void onerror(string utteranceid, int errorcode) {       // error reading text code errorcode, can mean lot of things    }    public void onstart(string utteranceid) {       // reading of sentence has started. example print on screen    } }); 

this called "subscribing event", , asynchronous because program can other things , you'll notified when "something" (what have subscribed to) happens.

then example when do

tts.speak ("welcome", ....) 

and finishes, method ondone in listener called. can start voice recognizer there.