@Override
 public boolean onKeyDown(int keyCode, KeyEvent event) {
   if (keyCode == KeyEvent.KEYCODE_BACK) {
     if (pvOptions.isShowing() || pvTime.isShowing()) {
       pvOptions.dismiss();
       pvTime.dismiss();
       return true;
     }
     if (pvTime.isShowing()) {
       pvTime.dismiss();
       return true;
     }
   }
   return super.onKeyDown(keyCode, event);
 }