How to create Android text to speech application that says "hello world" without using text field to write the text? -

i making simple application when user clicks on button, background voice says "hello world". have gone through tutorials problem use text field write text user , executed button. want user click on button , voice should "hello world".

your mainactivity:-

package com.example.tts;  import android.app.activity; import android.os.bundle; import android.speech.tts.texttospeech; import android.view.view; import android.widget.button; import android.widget.edittext; import java.util.locale; import android.widget.toast;  public class mainactivity extends activity {    texttospeech t1;    button b1;     @override    protected void oncreate(bundle savedinstancestate) {       super.oncreate(savedinstancestate);       setcontentview(r.layout.activity_main);       b1=(button)findviewbyid(r.id.button);        t1=new texttospeech(getapplicationcontext(), new texttospeech.oninitlistener() {          @override          public void oninit(int status) {             if(status != texttospeech.error) {                t1.setlanguage(locale.uk);             }          }       });        b1.setonclicklistener(new view.onclicklistener() {          @override          public void onclick(view v) {             string tospeak = "hello world";             toast.maketext(getapplicationcontext(), tospeak,toast.length_short).show();             t1.speak(tospeak, texttospeech.queue_flush, null);          }       });    }     public void onpause(){       if(t1 !=null){          t1.stop();          t1.shutdown();       }       super.onpause();    } }