android - ProgressBar is not set visible before other operations by click button -

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i work mediaplayer , want show progressbar before calling method mediaplayer.prepare() (it can take time). tried asynktast, thread, handler show progressbar after operations @ end of clickplaybutton method. wrong? thanks!

progressbar declaration:

<progressbar android:id="@+id/progressbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:visibility="invisible"/>

clickplaybutton method

public void clickplaybutton(view view) {     thread t = new thread(new runnable() {         public void run() {           h.post(updateprogress);         }     });     t.start();  //  progressbar.setvisibility(progressbar.visible);    // new progresstask().execute();      mtimer = new timer();     mmytimertask = new mytimertask();     if(!mediaplayer.isplaying()){        btnplay.setimageresource(r.drawable.player_stop);        try {             mediaplayer.setdatasource(data_http);                 mediaplayer.prepare();            }        catch (exception e) { e.printstacktrace(); }         mediaplayer.start();        mtimer.schedule(mmytimertask, 10, 5000);     }     else {           btnplay.setimageresource(r.drawable.player_play);           mediaplayer.pause();           mtimer.cancel();          }   //  progressbar.setvisibility(progressbar.invisible); }  handler h = new handler(); runnable updateprogress = new runnable() {     public void run() {         progressbar.setvisibility(view.visible);     } };





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