java - Issue in changing the visiblity of buttons inside OnClickListener -

below code playing audio in project.when click on play button changes pause button , playing audio through init() method inside application class.the issue facing after clicking on play button takes few seconds(5-10 seconds) after play button changes pause.but should change pause button first statement inside onclick() holder.pause.setvisibility(view.visible);. if comment out init method call line projectapplication.getinstance().init(mctxt, lmoment.getprojectmedialoc(), holder.lvisualizerview, laudioprogressbar,holder.image,holder.image2); changes pause button init method required playing audio.if use postdelayed() method , call init() method after 2 seconds works expected .but fail understand why init() method creating problem in changing visiblity of play , pause buttons init method() called after changing visiblity.

holder.play.setonclicklistener(new view.onclicklistener()             {                 @override                 public void onclick(view view)                 {                     holder.pause.setvisibility(view.visible);                     holder.play.setvisibility(view.invisible);                      projectapplication.getinstance().init(mctxt, lmoment.getprojectmedialoc(), holder.lvisualizerview, laudioprogressbar,holder.play,holder.pause);                      notifydatasetchanged();                      }              }); 

projectapplication.java

 public void init(context mctxt,string aaudiourl, final visualizerview mvisulizerview,final progressbar laudioprogressbar,final imageview play,final imageview pause  )     {          laudioprogressbar.setvisibility(view.visible);          mprojectplayer= mediaplayer.create(mctxt, uri.parse(aaudiourl));       mprojectplayer.setlooping(false);         mprojectplayer.setonpreparedlistener(new mediaplayer.onpreparedlistener() {             @override             public void onprepared(mediaplayer mediaplayer) {                 log.e("msg","start");                 mprojectplayer.start();                  mprogressbar.setvisibility(view.gone);                 laudioprogressbar.setvisibility(view.invisible);                 mprojectplayer.setoncompletionlistener(new mediaplayer.oncompletionlistener() {                     @override                     public void oncompletion(mediaplayer mp) {                         play.setvisibility(view.visible);                        pause.setvisibility(view.invisible);                         mvisulizerview.setvisibility(view.invisible);                         projectapplication.getinstance().cleanup(mvisulizerview);                         homefragment.projectlistadapter.notifydatasetchanged();                     }                 });             }         });