java - How to start drawable animation after click ImageView? -

i have problem. want make drawable animation after click "imageview". found answer question , didn't find.

my code looks like:

import java.util.locale;  import android.app.activity; import android.graphics.drawable.animationdrawable; import android.os.bundle; import android.speech.tts.texttospeech; import android.util.log; import android.view.motionevent; import android.view.view; import android.widget.button; import android.widget.edittext; import android.widget.imageview;  public class talking extends activity implements texttospeech.oninitlistener  {          private texttospeech tts;         private button button1;         private edittext edittext1;         private animationdrawable penguinanimation;      @override     protected void oncreate(bundle savedinstancestate) {         // todo auto-generated method stub         super.oncreate(savedinstancestate);         setcontentview(r.layout.talking);          tts = new texttospeech(this, this);         button1 = (button) findviewbyid(r.id.button1);         edittext1 = (edittext) findviewbyid(r.id.edittext1);          // button on click event         button1.setonclicklistener(new view.onclicklistener() {              @override             public void onclick(view arg0) {                 speakout();             }          });          imageview penguin = (imageview) findviewbyid(r.id.imageview1);         penguin.setbackgroundresource(r.drawable.penguin_anim);         penguinanimation = (animationdrawable) penguin.getbackground();        }     @override     public void ondestroy() {         // don't forget shutdown tts!         if (tts != null) {             tts.stop();             tts.shutdown();         }         super.ondestroy();     }       protected void speakout() {         // todo auto-generated method stub         string text = edittext1.gettext().tostring();          tts.speak(text, texttospeech.queue_flush, null);      }      @override     public void oninit(int status) {         // todo auto-generated method stub           if (status == texttospeech.success) {              int result = tts.setlanguage(locale.us);              if (result == texttospeech.lang_missing_data                     || result == texttospeech.lang_not_supported) {                 log.e("tts", "this language not supported");             } else {                 button1.setenabled(true);                 speakout();             }          } else {             log.e("tts", "initilization failed!");         }      }     public boolean ontouchevent(motionevent event) {           if (event.getaction() == motionevent.action_down) {             penguinanimation.start();             return true;           }           return super.ontouchevent(event);         }  } 

i made drawable animation using http://developer.android.com/guide/topics/graphics/drawable-animation.html

add

 penguinanimation.start() 

in

 speakout()  

method, calling imageview clicklistener.