android - How To Change Background Resource of Button after Several Seconds -

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i creating app memory game. button has image resource drawable , want background resource of button go default background, after 5 seconds.

here code.

 collections.shuffle(shapesarray);     this.myimg1=shapesarray.get(0);    img1.setbackgroundresource(myimg1);     task =  new timertask(){      @override     public void run() {         // todo auto-generated method stub          img1.setbackgroundresource(android.r.drawable.btn_default);     }     };     timer appear = new timer();    appear.schedule(task, 5000);     img1.setonclicklistener(new onclicklistener(){          public void onclick(view v) {             img1.setbackgroundresource(myimg1);             string txt = pname.gettext().tostring();              if(txt.equals("heart")){                     if(myimg1 == r.drawable.heart){                         correct++;                         img1.setbackgroundresource(android.r.drawable.btn_default);                     }                  }

however, after 5 seconds, activity force closes , goes previous activity. i'm kinda new android. please help. :(

you can use either handler post delay or can use count down timer ,here giving example of count down , is-

new countdowntimer(30000, 1000) {       public void ontick(long millisuntilfinished) {        //this when click on each tick came here after 1000 millisecond      }       public void onfinish() {     // after time experied here can change image        printer.setbackgroundresource(r.drawable.prntr);              }   }.start();

thanks


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